From 71be6b4942dd64bc17728f82f787be98fd8afed7 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:14 -0700 Subject: vfs: add a FALLOC_FL_UNSHARE mode to fallocate to unshare a range of blocks Add a new fallocate mode flag that explicitly unshares blocks on filesystems that support such features. The new flag can only be used with an allocate-mode fallocate call. Signed-off-by: Darrick J. Wong --- fs/open.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'fs') diff --git a/fs/open.c b/fs/open.c index 4fd6e256f4f4..d58525dda28d 100644 --- a/fs/open.c +++ b/fs/open.c @@ -256,6 +256,11 @@ int vfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len) (mode & ~FALLOC_FL_INSERT_RANGE)) return -EINVAL; + /* Unshare range should only be used with allocate mode. */ + if ((mode & FALLOC_FL_UNSHARE_RANGE) && + (mode & ~(FALLOC_FL_UNSHARE_RANGE | FALLOC_FL_KEEP_SIZE))) + return -EINVAL; + if (!(file->f_mode & FMODE_WRITE)) return -EBADF; -- cgit v1.2.3-59-g8ed1b From 9cdafd8a769b7c3a54e474393fb69d1fc2c42185 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:15 -0700 Subject: xfs: return an error when an inline directory is too small If the size of an inline directory is so small that it doesn't even cover the required header size, return an error to userspace instead of ASSERTing and returning 0 like everything's ok. Signed-off-by: Darrick J. Wong Reported-by: Jan Kara Reviewed-by: Brian Foster Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_dir2_readdir.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/xfs/xfs_dir2_readdir.c b/fs/xfs/xfs_dir2_readdir.c index f44f79996978..29816981b50a 100644 --- a/fs/xfs/xfs_dir2_readdir.c +++ b/fs/xfs/xfs_dir2_readdir.c @@ -84,7 +84,8 @@ xfs_dir2_sf_getdents( sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data; - ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count)); + if (dp->i_d.di_size < xfs_dir2_sf_hdr_size(sfp->i8count)) + return -EFSCORRUPTED; /* * If the block number in the offset is out of range, we're done. -- cgit v1.2.3-59-g8ed1b From c75c752d03741a0ebda3ea4c5020ba22c7570561 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:15 -0700 Subject: xfs: define tracepoints for refcount btree activities Define all the tracepoints we need to inspect the refcount btree runtime operation. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_trace.h | 301 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 301 insertions(+) (limited to 'fs') diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index c6b2b1dcde75..8446338929f6 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -40,6 +40,16 @@ struct xfs_inode_log_format; struct xfs_bmbt_irec; struct xfs_btree_cur; +#ifndef XFS_REFCOUNT_IREC_PLACEHOLDER +#define XFS_REFCOUNT_IREC_PLACEHOLDER +/* Placeholder definition to avoid breaking bisectability. */ +struct xfs_refcount_irec { + xfs_agblock_t rc_startblock; /* starting block number */ + xfs_extlen_t rc_blockcount; /* count of free blocks */ + xfs_nlink_t rc_refcount; /* number of inodes linked here */ +}; +#endif + DECLARE_EVENT_CLASS(xfs_attr_list_class, TP_PROTO(struct xfs_attr_list_context *ctx), TP_ARGS(ctx), @@ -2640,6 +2650,297 @@ DEFINE_AG_RESV_EVENT(xfs_ag_resv_needed); DEFINE_AG_ERROR_EVENT(xfs_ag_resv_free_error); DEFINE_AG_ERROR_EVENT(xfs_ag_resv_init_error); +/* refcount tracepoint classes */ + +/* reuse the discard trace class for agbno/aglen-based traces */ +#define DEFINE_AG_EXTENT_EVENT(name) DEFINE_DISCARD_EVENT(name) + +/* ag btree lookup tracepoint class */ +#define XFS_AG_BTREE_CMP_FORMAT_STR \ + { XFS_LOOKUP_EQ, "eq" }, \ + { XFS_LOOKUP_LE, "le" }, \ + { XFS_LOOKUP_GE, "ge" } +DECLARE_EVENT_CLASS(xfs_ag_btree_lookup_class, + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, + xfs_agblock_t agbno, xfs_lookup_t dir), + TP_ARGS(mp, agno, agbno, dir), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_agnumber_t, agno) + __field(xfs_agblock_t, agbno) + __field(xfs_lookup_t, dir) + ), + TP_fast_assign( + __entry->dev = mp->m_super->s_dev; + __entry->agno = agno; + __entry->agbno = agbno; + __entry->dir = dir; + ), + TP_printk("dev %d:%d agno %u agbno %u cmp %s(%d)\n", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->agno, + __entry->agbno, + __print_symbolic(__entry->dir, XFS_AG_BTREE_CMP_FORMAT_STR), + __entry->dir) +) + +#define DEFINE_AG_BTREE_LOOKUP_EVENT(name) \ +DEFINE_EVENT(xfs_ag_btree_lookup_class, name, \ + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, \ + xfs_agblock_t agbno, xfs_lookup_t dir), \ + TP_ARGS(mp, agno, agbno, dir)) + +/* single-rcext tracepoint class */ +DECLARE_EVENT_CLASS(xfs_refcount_extent_class, + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, + struct xfs_refcount_irec *irec), + TP_ARGS(mp, agno, irec), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_agnumber_t, agno) + __field(xfs_agblock_t, startblock) + __field(xfs_extlen_t, blockcount) + __field(xfs_nlink_t, refcount) + ), + TP_fast_assign( + __entry->dev = mp->m_super->s_dev; + __entry->agno = agno; + __entry->startblock = irec->rc_startblock; + __entry->blockcount = irec->rc_blockcount; + __entry->refcount = irec->rc_refcount; + ), + TP_printk("dev %d:%d agno %u agbno %u len %u refcount %u\n", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->agno, + __entry->startblock, + __entry->blockcount, + __entry->refcount) +) + +#define DEFINE_REFCOUNT_EXTENT_EVENT(name) \ +DEFINE_EVENT(xfs_refcount_extent_class, name, \ + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, \ + struct xfs_refcount_irec *irec), \ + TP_ARGS(mp, agno, irec)) + +/* single-rcext and an agbno tracepoint class */ +DECLARE_EVENT_CLASS(xfs_refcount_extent_at_class, + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, + struct xfs_refcount_irec *irec, xfs_agblock_t agbno), + TP_ARGS(mp, agno, irec, agbno), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_agnumber_t, agno) + __field(xfs_agblock_t, startblock) + __field(xfs_extlen_t, blockcount) + __field(xfs_nlink_t, refcount) + __field(xfs_agblock_t, agbno) + ), + TP_fast_assign( + __entry->dev = mp->m_super->s_dev; + __entry->agno = agno; + __entry->startblock = irec->rc_startblock; + __entry->blockcount = irec->rc_blockcount; + __entry->refcount = irec->rc_refcount; + __entry->agbno = agbno; + ), + TP_printk("dev %d:%d agno %u agbno %u len %u refcount %u @ agbno %u\n", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->agno, + __entry->startblock, + __entry->blockcount, + __entry->refcount, + __entry->agbno) +) + +#define DEFINE_REFCOUNT_EXTENT_AT_EVENT(name) \ +DEFINE_EVENT(xfs_refcount_extent_at_class, name, \ + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, \ + struct xfs_refcount_irec *irec, xfs_agblock_t agbno), \ + TP_ARGS(mp, agno, irec, agbno)) + +/* double-rcext tracepoint class */ +DECLARE_EVENT_CLASS(xfs_refcount_double_extent_class, + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, + struct xfs_refcount_irec *i1, struct xfs_refcount_irec *i2), + TP_ARGS(mp, agno, i1, i2), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_agnumber_t, agno) + __field(xfs_agblock_t, i1_startblock) + __field(xfs_extlen_t, i1_blockcount) + __field(xfs_nlink_t, i1_refcount) + __field(xfs_agblock_t, i2_startblock) + __field(xfs_extlen_t, i2_blockcount) + __field(xfs_nlink_t, i2_refcount) + ), + TP_fast_assign( + __entry->dev = mp->m_super->s_dev; + __entry->agno = agno; + __entry->i1_startblock = i1->rc_startblock; + __entry->i1_blockcount = i1->rc_blockcount; + __entry->i1_refcount = i1->rc_refcount; + __entry->i2_startblock = i2->rc_startblock; + __entry->i2_blockcount = i2->rc_blockcount; + __entry->i2_refcount = i2->rc_refcount; + ), + TP_printk("dev %d:%d agno %u agbno %u len %u refcount %u -- " + "agbno %u len %u refcount %u\n", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->agno, + __entry->i1_startblock, + __entry->i1_blockcount, + __entry->i1_refcount, + __entry->i2_startblock, + __entry->i2_blockcount, + __entry->i2_refcount) +) + +#define DEFINE_REFCOUNT_DOUBLE_EXTENT_EVENT(name) \ +DEFINE_EVENT(xfs_refcount_double_extent_class, name, \ + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, \ + struct xfs_refcount_irec *i1, struct xfs_refcount_irec *i2), \ + TP_ARGS(mp, agno, i1, i2)) + +/* double-rcext and an agbno tracepoint class */ +DECLARE_EVENT_CLASS(xfs_refcount_double_extent_at_class, + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, + struct xfs_refcount_irec *i1, struct xfs_refcount_irec *i2, + xfs_agblock_t agbno), + TP_ARGS(mp, agno, i1, i2, agbno), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_agnumber_t, agno) + __field(xfs_agblock_t, i1_startblock) + __field(xfs_extlen_t, i1_blockcount) + __field(xfs_nlink_t, i1_refcount) + __field(xfs_agblock_t, i2_startblock) + __field(xfs_extlen_t, i2_blockcount) + __field(xfs_nlink_t, i2_refcount) + __field(xfs_agblock_t, agbno) + ), + TP_fast_assign( + __entry->dev = mp->m_super->s_dev; + __entry->agno = agno; + __entry->i1_startblock = i1->rc_startblock; + __entry->i1_blockcount = i1->rc_blockcount; + __entry->i1_refcount = i1->rc_refcount; + __entry->i2_startblock = i2->rc_startblock; + __entry->i2_blockcount = i2->rc_blockcount; + __entry->i2_refcount = i2->rc_refcount; + __entry->agbno = agbno; + ), + TP_printk("dev %d:%d agno %u agbno %u len %u refcount %u -- " + "agbno %u len %u refcount %u @ agbno %u\n", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->agno, + __entry->i1_startblock, + __entry->i1_blockcount, + __entry->i1_refcount, + __entry->i2_startblock, + __entry->i2_blockcount, + __entry->i2_refcount, + __entry->agbno) +) + +#define DEFINE_REFCOUNT_DOUBLE_EXTENT_AT_EVENT(name) \ +DEFINE_EVENT(xfs_refcount_double_extent_at_class, name, \ + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, \ + struct xfs_refcount_irec *i1, struct xfs_refcount_irec *i2, \ + xfs_agblock_t agbno), \ + TP_ARGS(mp, agno, i1, i2, agbno)) + +/* triple-rcext tracepoint class */ +DECLARE_EVENT_CLASS(xfs_refcount_triple_extent_class, + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, + struct xfs_refcount_irec *i1, struct xfs_refcount_irec *i2, + struct xfs_refcount_irec *i3), + TP_ARGS(mp, agno, i1, i2, i3), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_agnumber_t, agno) + __field(xfs_agblock_t, i1_startblock) + __field(xfs_extlen_t, i1_blockcount) + __field(xfs_nlink_t, i1_refcount) + __field(xfs_agblock_t, i2_startblock) + __field(xfs_extlen_t, i2_blockcount) + __field(xfs_nlink_t, i2_refcount) + __field(xfs_agblock_t, i3_startblock) + __field(xfs_extlen_t, i3_blockcount) + __field(xfs_nlink_t, i3_refcount) + ), + TP_fast_assign( + __entry->dev = mp->m_super->s_dev; + __entry->agno = agno; + __entry->i1_startblock = i1->rc_startblock; + __entry->i1_blockcount = i1->rc_blockcount; + __entry->i1_refcount = i1->rc_refcount; + __entry->i2_startblock = i2->rc_startblock; + __entry->i2_blockcount = i2->rc_blockcount; + __entry->i2_refcount = i2->rc_refcount; + __entry->i3_startblock = i3->rc_startblock; + __entry->i3_blockcount = i3->rc_blockcount; + __entry->i3_refcount = i3->rc_refcount; + ), + TP_printk("dev %d:%d agno %u agbno %u len %u refcount %u -- " + "agbno %u len %u refcount %u -- " + "agbno %u len %u refcount %u\n", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->agno, + __entry->i1_startblock, + __entry->i1_blockcount, + __entry->i1_refcount, + __entry->i2_startblock, + __entry->i2_blockcount, + __entry->i2_refcount, + __entry->i3_startblock, + __entry->i3_blockcount, + __entry->i3_refcount) +); + +#define DEFINE_REFCOUNT_TRIPLE_EXTENT_EVENT(name) \ +DEFINE_EVENT(xfs_refcount_triple_extent_class, name, \ + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, \ + struct xfs_refcount_irec *i1, struct xfs_refcount_irec *i2, \ + struct xfs_refcount_irec *i3), \ + TP_ARGS(mp, agno, i1, i2, i3)) + +/* refcount btree tracepoints */ +DEFINE_BUSY_EVENT(xfs_refcountbt_alloc_block); +DEFINE_BUSY_EVENT(xfs_refcountbt_free_block); +DEFINE_AG_BTREE_LOOKUP_EVENT(xfs_refcount_lookup); +DEFINE_REFCOUNT_EXTENT_EVENT(xfs_refcount_get); +DEFINE_REFCOUNT_EXTENT_EVENT(xfs_refcount_update); +DEFINE_REFCOUNT_EXTENT_EVENT(xfs_refcount_insert); +DEFINE_REFCOUNT_EXTENT_EVENT(xfs_refcount_delete); +DEFINE_AG_ERROR_EVENT(xfs_refcount_insert_error); +DEFINE_AG_ERROR_EVENT(xfs_refcount_delete_error); +DEFINE_AG_ERROR_EVENT(xfs_refcount_update_error); + +/* refcount adjustment tracepoints */ +DEFINE_AG_EXTENT_EVENT(xfs_refcount_increase); +DEFINE_AG_EXTENT_EVENT(xfs_refcount_decrease); +DEFINE_REFCOUNT_TRIPLE_EXTENT_EVENT(xfs_refcount_merge_center_extents); +DEFINE_REFCOUNT_EXTENT_EVENT(xfs_refcount_modify_extent); +DEFINE_REFCOUNT_EXTENT_AT_EVENT(xfs_refcount_split_extent); +DEFINE_REFCOUNT_DOUBLE_EXTENT_EVENT(xfs_refcount_merge_left_extent); +DEFINE_REFCOUNT_DOUBLE_EXTENT_EVENT(xfs_refcount_merge_right_extent); +DEFINE_REFCOUNT_DOUBLE_EXTENT_AT_EVENT(xfs_refcount_find_left_extent); +DEFINE_REFCOUNT_DOUBLE_EXTENT_AT_EVENT(xfs_refcount_find_right_extent); +DEFINE_AG_ERROR_EVENT(xfs_refcount_adjust_error); +DEFINE_AG_ERROR_EVENT(xfs_refcount_merge_center_extents_error); +DEFINE_AG_ERROR_EVENT(xfs_refcount_modify_extent_error); +DEFINE_AG_ERROR_EVENT(xfs_refcount_split_extent_error); +DEFINE_AG_ERROR_EVENT(xfs_refcount_merge_left_extent_error); +DEFINE_AG_ERROR_EVENT(xfs_refcount_merge_right_extent_error); +DEFINE_AG_ERROR_EVENT(xfs_refcount_find_left_extent_error); +DEFINE_AG_ERROR_EVENT(xfs_refcount_find_right_extent_error); + +/* reflink helpers */ +DEFINE_AG_EXTENT_EVENT(xfs_refcount_find_shared); +DEFINE_AG_EXTENT_EVENT(xfs_refcount_find_shared_result); +DEFINE_AG_ERROR_EVENT(xfs_refcount_find_shared_error); + #endif /* _TRACE_XFS_H */ #undef TRACE_INCLUDE_PATH -- cgit v1.2.3-59-g8ed1b From 46eeb521b95247170d2db773bb4cc8fb3de1d85c Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:16 -0700 Subject: xfs: introduce refcount btree definitions Add new per-AG refcount btree definitions to the per-AG structures. Signed-off-by: Darrick J. Wong Signed-off-by: Christoph Hellwig Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_alloc.c | 5 +++++ fs/xfs/libxfs/xfs_btree.c | 5 +++-- fs/xfs/libxfs/xfs_btree.h | 4 ++++ fs/xfs/libxfs/xfs_format.h | 31 +++++++++++++++++++++++++++---- fs/xfs/libxfs/xfs_rmap_btree.c | 22 ++++++++++++++++++++-- fs/xfs/libxfs/xfs_types.h | 2 +- fs/xfs/xfs_inode.h | 5 +++++ fs/xfs/xfs_mount.h | 3 +++ fs/xfs/xfs_pnfs.c | 7 +++++++ fs/xfs/xfs_stats.c | 1 + fs/xfs/xfs_stats.h | 18 +++++++++++++++++- 11 files changed, 93 insertions(+), 10 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c index ca75dc90ebe0..275d3459e9e8 100644 --- a/fs/xfs/libxfs/xfs_alloc.c +++ b/fs/xfs/libxfs/xfs_alloc.c @@ -2458,6 +2458,10 @@ xfs_agf_verify( be32_to_cpu(agf->agf_btreeblks) > be32_to_cpu(agf->agf_length)) return false; + if (xfs_sb_version_hasreflink(&mp->m_sb) && + be32_to_cpu(agf->agf_refcount_level) > XFS_BTREE_MAXLEVELS) + return false; + return true;; } @@ -2578,6 +2582,7 @@ xfs_alloc_read_agf( be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNTi]); pag->pagf_levels[XFS_BTNUM_RMAPi] = be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAPi]); + pag->pagf_refcount_level = be32_to_cpu(agf->agf_refcount_level); spin_lock_init(&pag->pagb_lock); pag->pagb_count = 0; pag->pagb_tree = RB_ROOT; diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c index aa1752f918b8..f8bab9b22755 100644 --- a/fs/xfs/libxfs/xfs_btree.c +++ b/fs/xfs/libxfs/xfs_btree.c @@ -45,9 +45,10 @@ kmem_zone_t *xfs_btree_cur_zone; */ static const __uint32_t xfs_magics[2][XFS_BTNUM_MAX] = { { XFS_ABTB_MAGIC, XFS_ABTC_MAGIC, 0, XFS_BMAP_MAGIC, XFS_IBT_MAGIC, - XFS_FIBT_MAGIC }, + XFS_FIBT_MAGIC, 0 }, { XFS_ABTB_CRC_MAGIC, XFS_ABTC_CRC_MAGIC, XFS_RMAP_CRC_MAGIC, - XFS_BMAP_CRC_MAGIC, XFS_IBT_CRC_MAGIC, XFS_FIBT_CRC_MAGIC } + XFS_BMAP_CRC_MAGIC, XFS_IBT_CRC_MAGIC, XFS_FIBT_CRC_MAGIC, + XFS_REFC_CRC_MAGIC } }; #define xfs_btree_magic(cur) \ xfs_magics[!!((cur)->bc_flags & XFS_BTREE_CRC_BLOCKS)][cur->bc_btnum] diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h index 3f8556a5c2ad..e7ef1d9dbe6e 100644 --- a/fs/xfs/libxfs/xfs_btree.h +++ b/fs/xfs/libxfs/xfs_btree.h @@ -72,6 +72,7 @@ union xfs_btree_rec { #define XFS_BTNUM_INO ((xfs_btnum_t)XFS_BTNUM_INOi) #define XFS_BTNUM_FINO ((xfs_btnum_t)XFS_BTNUM_FINOi) #define XFS_BTNUM_RMAP ((xfs_btnum_t)XFS_BTNUM_RMAPi) +#define XFS_BTNUM_REFC ((xfs_btnum_t)XFS_BTNUM_REFCi) /* * For logging record fields. @@ -105,6 +106,7 @@ do { \ case XFS_BTNUM_INO: __XFS_BTREE_STATS_INC(__mp, ibt, stat); break; \ case XFS_BTNUM_FINO: __XFS_BTREE_STATS_INC(__mp, fibt, stat); break; \ case XFS_BTNUM_RMAP: __XFS_BTREE_STATS_INC(__mp, rmap, stat); break; \ + case XFS_BTNUM_REFC: __XFS_BTREE_STATS_INC(__mp, refcbt, stat); break; \ case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \ } \ } while (0) @@ -127,6 +129,8 @@ do { \ __XFS_BTREE_STATS_ADD(__mp, fibt, stat, val); break; \ case XFS_BTNUM_RMAP: \ __XFS_BTREE_STATS_ADD(__mp, rmap, stat, val); break; \ + case XFS_BTNUM_REFC: \ + __XFS_BTREE_STATS_ADD(__mp, refcbt, stat, val); break; \ case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \ } \ } while (0) diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 270fb5cf4fa1..57c52a6c7bb8 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -456,6 +456,7 @@ xfs_sb_has_compat_feature( #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */ #define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */ +#define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */ #define XFS_SB_FEAT_RO_COMPAT_ALL \ (XFS_SB_FEAT_RO_COMPAT_FINOBT | \ XFS_SB_FEAT_RO_COMPAT_RMAPBT) @@ -546,6 +547,12 @@ static inline bool xfs_sb_version_hasrmapbt(struct xfs_sb *sbp) (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT); } +static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp) +{ + return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && + (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK); +} + /* * end of superblock version macros */ @@ -641,14 +648,17 @@ typedef struct xfs_agf { uuid_t agf_uuid; /* uuid of filesystem */ __be32 agf_rmap_blocks; /* rmapbt blocks used */ - __be32 agf_padding; /* padding */ + __be32 agf_refcount_blocks; /* refcountbt blocks used */ + + __be32 agf_refcount_root; /* refcount tree root block */ + __be32 agf_refcount_level; /* refcount btree levels */ /* * reserve some contiguous space for future logged fields before we add * the unlogged fields. This makes the range logging via flags and * structure offsets much simpler. */ - __be64 agf_spare64[15]; + __be64 agf_spare64[14]; /* unlogged fields, written during buffer writeback. */ __be64 agf_lsn; /* last write sequence */ @@ -1041,9 +1051,14 @@ static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) * 16 bits of the XFS_XFLAG_s range. */ #define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */ +#define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */ +#define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */ #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) +#define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT) +#define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT) -#define XFS_DIFLAG2_ANY (XFS_DIFLAG2_DAX) +#define XFS_DIFLAG2_ANY \ + (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE) /* * Inode number format: @@ -1353,7 +1368,8 @@ struct xfs_owner_info { #define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */ #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */ #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */ -#define XFS_RMAP_OWN_MIN (-8ULL) /* guard */ +#define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */ +#define XFS_RMAP_OWN_MIN (-9ULL) /* guard */ #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63))) @@ -1433,6 +1449,13 @@ typedef __be32 xfs_rmap_ptr_t; XFS_FIBT_BLOCK(mp) + 1 : \ XFS_IBT_BLOCK(mp) + 1) +/* + * Reference Count Btree format definitions + * + */ +#define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */ + + /* * BMAP Btree format definitions * diff --git a/fs/xfs/libxfs/xfs_rmap_btree.c b/fs/xfs/libxfs/xfs_rmap_btree.c index 17b8eeb34ac8..9c0585e7db1f 100644 --- a/fs/xfs/libxfs/xfs_rmap_btree.c +++ b/fs/xfs/libxfs/xfs_rmap_btree.c @@ -512,6 +512,24 @@ void xfs_rmapbt_compute_maxlevels( struct xfs_mount *mp) { - mp->m_rmap_maxlevels = xfs_btree_compute_maxlevels(mp, - mp->m_rmap_mnr, mp->m_sb.sb_agblocks); + /* + * On a non-reflink filesystem, the maximum number of rmap + * records is the number of blocks in the AG, hence the max + * rmapbt height is log_$maxrecs($agblocks). However, with + * reflink each AG block can have up to 2^32 (per the refcount + * record format) owners, which means that theoretically we + * could face up to 2^64 rmap records. + * + * That effectively means that the max rmapbt height must be + * XFS_BTREE_MAXLEVELS. "Fortunately" we'll run out of AG + * blocks to feed the rmapbt long before the rmapbt reaches + * maximum height. The reflink code uses ag_resv_critical to + * disallow reflinking when less than 10% of the per-AG metadata + * block reservation since the fallback is a regular file copy. + */ + if (xfs_sb_version_hasreflink(&mp->m_sb)) + mp->m_rmap_maxlevels = XFS_BTREE_MAXLEVELS; + else + mp->m_rmap_maxlevels = xfs_btree_compute_maxlevels(mp, + mp->m_rmap_mnr, mp->m_sb.sb_agblocks); } diff --git a/fs/xfs/libxfs/xfs_types.h b/fs/xfs/libxfs/xfs_types.h index 3d503647f26b..be7b6de5137d 100644 --- a/fs/xfs/libxfs/xfs_types.h +++ b/fs/xfs/libxfs/xfs_types.h @@ -109,7 +109,7 @@ typedef enum { typedef enum { XFS_BTNUM_BNOi, XFS_BTNUM_CNTi, XFS_BTNUM_RMAPi, XFS_BTNUM_BMAPi, - XFS_BTNUM_INOi, XFS_BTNUM_FINOi, XFS_BTNUM_MAX + XFS_BTNUM_INOi, XFS_BTNUM_FINOi, XFS_BTNUM_REFCi, XFS_BTNUM_MAX } xfs_btnum_t; struct xfs_name { diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index 8f30d2533b48..a8658e68041a 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -202,6 +202,11 @@ xfs_get_initial_prid(struct xfs_inode *dp) return XFS_PROJID_DEFAULT; } +static inline bool xfs_is_reflink_inode(struct xfs_inode *ip) +{ + return ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK; +} + /* * In-core inode flags. */ diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h index 041d9493e798..8fab4962c4f1 100644 --- a/fs/xfs/xfs_mount.h +++ b/fs/xfs/xfs_mount.h @@ -399,6 +399,9 @@ typedef struct xfs_perag { struct xfs_ag_resv pag_meta_resv; /* Blocks reserved for just AGFL-based metadata. */ struct xfs_ag_resv pag_agfl_resv; + + /* reference count */ + __uint8_t pagf_refcount_level; } xfs_perag_t; static inline struct xfs_ag_resv * diff --git a/fs/xfs/xfs_pnfs.c b/fs/xfs/xfs_pnfs.c index 0f14b2e4bf6c..93a7aafa56d6 100644 --- a/fs/xfs/xfs_pnfs.c +++ b/fs/xfs/xfs_pnfs.c @@ -113,6 +113,13 @@ xfs_fs_map_blocks( if (XFS_IS_REALTIME_INODE(ip)) return -ENXIO; + /* + * The pNFS block layout spec actually supports reflink like + * functionality, but the Linux pNFS server doesn't implement it yet. + */ + if (xfs_is_reflink_inode(ip)) + return -ENXIO; + /* * Lock out any other I/O before we flush and invalidate the pagecache, * and then hand out a layout to the remote system. This is very diff --git a/fs/xfs/xfs_stats.c b/fs/xfs/xfs_stats.c index 6e812fe0fd43..12d48cd8f8a4 100644 --- a/fs/xfs/xfs_stats.c +++ b/fs/xfs/xfs_stats.c @@ -62,6 +62,7 @@ int xfs_stats_format(struct xfsstats __percpu *stats, char *buf) { "ibt2", XFSSTAT_END_IBT_V2 }, { "fibt2", XFSSTAT_END_FIBT_V2 }, { "rmapbt", XFSSTAT_END_RMAP_V2 }, + { "refcntbt", XFSSTAT_END_REFCOUNT }, /* we print both series of quota information together */ { "qm", XFSSTAT_END_QM }, }; diff --git a/fs/xfs/xfs_stats.h b/fs/xfs/xfs_stats.h index 657865f51e78..79ad2e69fc33 100644 --- a/fs/xfs/xfs_stats.h +++ b/fs/xfs/xfs_stats.h @@ -213,7 +213,23 @@ struct xfsstats { __uint32_t xs_rmap_2_alloc; __uint32_t xs_rmap_2_free; __uint32_t xs_rmap_2_moves; -#define XFSSTAT_END_XQMSTAT (XFSSTAT_END_RMAP_V2+6) +#define XFSSTAT_END_REFCOUNT (XFSSTAT_END_RMAP_V2 + 15) + __uint32_t xs_refcbt_2_lookup; + __uint32_t xs_refcbt_2_compare; + __uint32_t xs_refcbt_2_insrec; + __uint32_t xs_refcbt_2_delrec; + __uint32_t xs_refcbt_2_newroot; + __uint32_t xs_refcbt_2_killroot; + __uint32_t xs_refcbt_2_increment; + __uint32_t xs_refcbt_2_decrement; + __uint32_t xs_refcbt_2_lshift; + __uint32_t xs_refcbt_2_rshift; + __uint32_t xs_refcbt_2_split; + __uint32_t xs_refcbt_2_join; + __uint32_t xs_refcbt_2_alloc; + __uint32_t xs_refcbt_2_free; + __uint32_t xs_refcbt_2_moves; +#define XFSSTAT_END_XQMSTAT (XFSSTAT_END_REFCOUNT + 6) __uint32_t xs_qm_dqreclaims; __uint32_t xs_qm_dqreclaim_misses; __uint32_t xs_qm_dquot_dups; -- cgit v1.2.3-59-g8ed1b From af30dfa14411e9df0e69c6e46e8c6c467b88229d Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:17 -0700 Subject: xfs: refcount btree add more reserved blocks Since XFS reserves a small amount of space in each AG as the minimum free space needed for an operation, save some more space in case we touch the refcount btree. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_alloc.c | 13 +++++++++++++ fs/xfs/libxfs/xfs_format.h | 2 ++ 2 files changed, 15 insertions(+) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c index 275d3459e9e8..aa0e1ca7b6a5 100644 --- a/fs/xfs/libxfs/xfs_alloc.c +++ b/fs/xfs/libxfs/xfs_alloc.c @@ -52,10 +52,23 @@ STATIC int xfs_alloc_ag_vextent_size(xfs_alloc_arg_t *); STATIC int xfs_alloc_ag_vextent_small(xfs_alloc_arg_t *, xfs_btree_cur_t *, xfs_agblock_t *, xfs_extlen_t *, int *); +unsigned int +xfs_refc_block( + struct xfs_mount *mp) +{ + if (xfs_sb_version_hasrmapbt(&mp->m_sb)) + return XFS_RMAP_BLOCK(mp) + 1; + if (xfs_sb_version_hasfinobt(&mp->m_sb)) + return XFS_FIBT_BLOCK(mp) + 1; + return XFS_IBT_BLOCK(mp) + 1; +} + xfs_extlen_t xfs_prealloc_blocks( struct xfs_mount *mp) { + if (xfs_sb_version_hasreflink(&mp->m_sb)) + return xfs_refc_block(mp) + 1; if (xfs_sb_version_hasrmapbt(&mp->m_sb)) return XFS_RMAP_BLOCK(mp) + 1; if (xfs_sb_version_hasfinobt(&mp->m_sb)) diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 57c52a6c7bb8..622055bb283b 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -1455,6 +1455,8 @@ typedef __be32 xfs_rmap_ptr_t; */ #define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */ +unsigned int xfs_refc_block(struct xfs_mount *mp); + /* * BMAP Btree format definitions -- cgit v1.2.3-59-g8ed1b From 1946b91cee4fc8ae25450673e4d4f35e9b462e9e Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:18 -0700 Subject: xfs: define the on-disk refcount btree format Start constructing the refcount btree implementation by establishing the on-disk format and everything needed to read, write, and manipulate the refcount btree blocks. Signed-off-by: Darrick J. Wong Signed-off-by: Christoph Hellwig Reviewed-by: Christoph Hellwig --- fs/xfs/Makefile | 1 + fs/xfs/libxfs/xfs_btree.c | 3 + fs/xfs/libxfs/xfs_btree.h | 12 +++ fs/xfs/libxfs/xfs_format.h | 36 ++++++++ fs/xfs/libxfs/xfs_refcount_btree.c | 178 +++++++++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_refcount_btree.h | 67 ++++++++++++++ fs/xfs/libxfs/xfs_sb.c | 9 ++ fs/xfs/libxfs/xfs_shared.h | 2 + fs/xfs/libxfs/xfs_trans_resv.c | 2 +- fs/xfs/libxfs/xfs_trans_resv.h | 1 + fs/xfs/xfs_mount.c | 2 + fs/xfs/xfs_mount.h | 3 + fs/xfs/xfs_ondisk.h | 3 + fs/xfs/xfs_trace.h | 11 +-- 14 files changed, 319 insertions(+), 11 deletions(-) create mode 100644 fs/xfs/libxfs/xfs_refcount_btree.c create mode 100644 fs/xfs/libxfs/xfs_refcount_btree.h (limited to 'fs') diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile index 584e87e11cb6..8d749f2df99e 100644 --- a/fs/xfs/Makefile +++ b/fs/xfs/Makefile @@ -55,6 +55,7 @@ xfs-y += $(addprefix libxfs/, \ xfs_ag_resv.o \ xfs_rmap.o \ xfs_rmap_btree.o \ + xfs_refcount_btree.o \ xfs_sb.o \ xfs_symlink_remote.o \ xfs_trans_resv.o \ diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c index f8bab9b22755..5c8e6f2ce44f 100644 --- a/fs/xfs/libxfs/xfs_btree.c +++ b/fs/xfs/libxfs/xfs_btree.c @@ -1217,6 +1217,9 @@ xfs_btree_set_refs( case XFS_BTNUM_RMAP: xfs_buf_set_ref(bp, XFS_RMAP_BTREE_REF); break; + case XFS_BTNUM_REFC: + xfs_buf_set_ref(bp, XFS_REFC_BTREE_REF); + break; default: ASSERT(0); } diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h index e7ef1d9dbe6e..c2b01d1c79ee 100644 --- a/fs/xfs/libxfs/xfs_btree.h +++ b/fs/xfs/libxfs/xfs_btree.h @@ -49,6 +49,7 @@ union xfs_btree_key { struct xfs_inobt_key inobt; struct xfs_rmap_key rmap; struct xfs_rmap_key __rmap_bigkey[2]; + struct xfs_refcount_key refc; }; union xfs_btree_rec { @@ -57,6 +58,7 @@ union xfs_btree_rec { struct xfs_alloc_rec alloc; struct xfs_inobt_rec inobt; struct xfs_rmap_rec rmap; + struct xfs_refcount_rec refc; }; /* @@ -221,6 +223,15 @@ union xfs_btree_irec { struct xfs_bmbt_irec b; struct xfs_inobt_rec_incore i; struct xfs_rmap_irec r; + struct xfs_refcount_irec rc; +}; + +/* Per-AG btree private information. */ +union xfs_btree_cur_private { + struct { + unsigned long nr_ops; /* # record updates */ + int shape_changes; /* # of extent splits */ + } refc; }; /* @@ -247,6 +258,7 @@ typedef struct xfs_btree_cur struct xfs_buf *agbp; /* agf/agi buffer pointer */ struct xfs_defer_ops *dfops; /* deferred updates */ xfs_agnumber_t agno; /* ag number */ + union xfs_btree_cur_private priv; } a; struct { /* needed for BMAP */ struct xfs_inode *ip; /* pointer to our inode */ diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 622055bb283b..97c74f4a22b5 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -1457,6 +1457,42 @@ typedef __be32 xfs_rmap_ptr_t; unsigned int xfs_refc_block(struct xfs_mount *mp); +/* + * Data record/key structure + * + * Each record associates a range of physical blocks (starting at + * rc_startblock and ending rc_blockcount blocks later) with a reference + * count (rc_refcount). Extents that are being used to stage a copy on + * write (CoW) operation are recorded in the refcount btree with a + * refcount of 1. All other records must have a refcount > 1 and must + * track an extent mapped only by file data forks. + * + * Extents with a single owner (attributes, metadata, non-shared file + * data) are not tracked here. Free space is also not tracked here. + * This is consistent with pre-reflink XFS. + */ +struct xfs_refcount_rec { + __be32 rc_startblock; /* starting block number */ + __be32 rc_blockcount; /* count of blocks */ + __be32 rc_refcount; /* number of inodes linked here */ +}; + +struct xfs_refcount_key { + __be32 rc_startblock; /* starting block number */ +}; + +struct xfs_refcount_irec { + xfs_agblock_t rc_startblock; /* starting block number */ + xfs_extlen_t rc_blockcount; /* count of free blocks */ + xfs_nlink_t rc_refcount; /* number of inodes linked here */ +}; + +#define MAXREFCOUNT ((xfs_nlink_t)~0U) +#define MAXREFCEXTLEN ((xfs_extlen_t)~0U) + +/* btree pointer type */ +typedef __be32 xfs_refcount_ptr_t; + /* * BMAP Btree format definitions diff --git a/fs/xfs/libxfs/xfs_refcount_btree.c b/fs/xfs/libxfs/xfs_refcount_btree.c new file mode 100644 index 000000000000..359cf0c3a6b4 --- /dev/null +++ b/fs/xfs/libxfs/xfs_refcount_btree.c @@ -0,0 +1,178 @@ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_sb.h" +#include "xfs_mount.h" +#include "xfs_btree.h" +#include "xfs_bmap.h" +#include "xfs_refcount_btree.h" +#include "xfs_alloc.h" +#include "xfs_error.h" +#include "xfs_trace.h" +#include "xfs_cksum.h" +#include "xfs_trans.h" +#include "xfs_bit.h" + +static struct xfs_btree_cur * +xfs_refcountbt_dup_cursor( + struct xfs_btree_cur *cur) +{ + return xfs_refcountbt_init_cursor(cur->bc_mp, cur->bc_tp, + cur->bc_private.a.agbp, cur->bc_private.a.agno, + cur->bc_private.a.dfops); +} + +STATIC bool +xfs_refcountbt_verify( + struct xfs_buf *bp) +{ + struct xfs_mount *mp = bp->b_target->bt_mount; + struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); + struct xfs_perag *pag = bp->b_pag; + unsigned int level; + + if (block->bb_magic != cpu_to_be32(XFS_REFC_CRC_MAGIC)) + return false; + + if (!xfs_sb_version_hasreflink(&mp->m_sb)) + return false; + if (!xfs_btree_sblock_v5hdr_verify(bp)) + return false; + + level = be16_to_cpu(block->bb_level); + if (pag && pag->pagf_init) { + if (level >= pag->pagf_refcount_level) + return false; + } else if (level >= mp->m_refc_maxlevels) + return false; + + return xfs_btree_sblock_verify(bp, mp->m_refc_mxr[level != 0]); +} + +STATIC void +xfs_refcountbt_read_verify( + struct xfs_buf *bp) +{ + if (!xfs_btree_sblock_verify_crc(bp)) + xfs_buf_ioerror(bp, -EFSBADCRC); + else if (!xfs_refcountbt_verify(bp)) + xfs_buf_ioerror(bp, -EFSCORRUPTED); + + if (bp->b_error) { + trace_xfs_btree_corrupt(bp, _RET_IP_); + xfs_verifier_error(bp); + } +} + +STATIC void +xfs_refcountbt_write_verify( + struct xfs_buf *bp) +{ + if (!xfs_refcountbt_verify(bp)) { + trace_xfs_btree_corrupt(bp, _RET_IP_); + xfs_buf_ioerror(bp, -EFSCORRUPTED); + xfs_verifier_error(bp); + return; + } + xfs_btree_sblock_calc_crc(bp); + +} + +const struct xfs_buf_ops xfs_refcountbt_buf_ops = { + .name = "xfs_refcountbt", + .verify_read = xfs_refcountbt_read_verify, + .verify_write = xfs_refcountbt_write_verify, +}; + +static const struct xfs_btree_ops xfs_refcountbt_ops = { + .rec_len = sizeof(struct xfs_refcount_rec), + .key_len = sizeof(struct xfs_refcount_key), + + .dup_cursor = xfs_refcountbt_dup_cursor, + .buf_ops = &xfs_refcountbt_buf_ops, +}; + +/* + * Allocate a new refcount btree cursor. + */ +struct xfs_btree_cur * +xfs_refcountbt_init_cursor( + struct xfs_mount *mp, + struct xfs_trans *tp, + struct xfs_buf *agbp, + xfs_agnumber_t agno, + struct xfs_defer_ops *dfops) +{ + struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); + struct xfs_btree_cur *cur; + + ASSERT(agno != NULLAGNUMBER); + ASSERT(agno < mp->m_sb.sb_agcount); + cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_NOFS); + + cur->bc_tp = tp; + cur->bc_mp = mp; + cur->bc_btnum = XFS_BTNUM_REFC; + cur->bc_blocklog = mp->m_sb.sb_blocklog; + cur->bc_ops = &xfs_refcountbt_ops; + + cur->bc_nlevels = be32_to_cpu(agf->agf_refcount_level); + + cur->bc_private.a.agbp = agbp; + cur->bc_private.a.agno = agno; + cur->bc_private.a.dfops = dfops; + cur->bc_flags |= XFS_BTREE_CRC_BLOCKS; + + cur->bc_private.a.priv.refc.nr_ops = 0; + cur->bc_private.a.priv.refc.shape_changes = 0; + + return cur; +} + +/* + * Calculate the number of records in a refcount btree block. + */ +int +xfs_refcountbt_maxrecs( + struct xfs_mount *mp, + int blocklen, + bool leaf) +{ + blocklen -= XFS_REFCOUNT_BLOCK_LEN; + + if (leaf) + return blocklen / sizeof(struct xfs_refcount_rec); + return blocklen / (sizeof(struct xfs_refcount_key) + + sizeof(xfs_refcount_ptr_t)); +} + +/* Compute the maximum height of a refcount btree. */ +void +xfs_refcountbt_compute_maxlevels( + struct xfs_mount *mp) +{ + mp->m_refc_maxlevels = xfs_btree_compute_maxlevels(mp, + mp->m_refc_mnr, mp->m_sb.sb_agblocks); +} diff --git a/fs/xfs/libxfs/xfs_refcount_btree.h b/fs/xfs/libxfs/xfs_refcount_btree.h new file mode 100644 index 000000000000..9e9ad7c6d267 --- /dev/null +++ b/fs/xfs/libxfs/xfs_refcount_btree.h @@ -0,0 +1,67 @@ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#ifndef __XFS_REFCOUNT_BTREE_H__ +#define __XFS_REFCOUNT_BTREE_H__ + +/* + * Reference Count Btree on-disk structures + */ + +struct xfs_buf; +struct xfs_btree_cur; +struct xfs_mount; + +/* + * Btree block header size + */ +#define XFS_REFCOUNT_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN + +/* + * Record, key, and pointer address macros for btree blocks. + * + * (note that some of these may appear unused, but they are used in userspace) + */ +#define XFS_REFCOUNT_REC_ADDR(block, index) \ + ((struct xfs_refcount_rec *) \ + ((char *)(block) + \ + XFS_REFCOUNT_BLOCK_LEN + \ + (((index) - 1) * sizeof(struct xfs_refcount_rec)))) + +#define XFS_REFCOUNT_KEY_ADDR(block, index) \ + ((struct xfs_refcount_key *) \ + ((char *)(block) + \ + XFS_REFCOUNT_BLOCK_LEN + \ + ((index) - 1) * sizeof(struct xfs_refcount_key))) + +#define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \ + ((xfs_refcount_ptr_t *) \ + ((char *)(block) + \ + XFS_REFCOUNT_BLOCK_LEN + \ + (maxrecs) * sizeof(struct xfs_refcount_key) + \ + ((index) - 1) * sizeof(xfs_refcount_ptr_t))) + +extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp, + struct xfs_trans *tp, struct xfs_buf *agbp, xfs_agnumber_t agno, + struct xfs_defer_ops *dfops); +extern int xfs_refcountbt_maxrecs(struct xfs_mount *mp, int blocklen, + bool leaf); +extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp); + +#endif /* __XFS_REFCOUNT_BTREE_H__ */ diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c index 4aecc5fefe96..a70aec910626 100644 --- a/fs/xfs/libxfs/xfs_sb.c +++ b/fs/xfs/libxfs/xfs_sb.c @@ -38,6 +38,8 @@ #include "xfs_ialloc_btree.h" #include "xfs_log.h" #include "xfs_rmap_btree.h" +#include "xfs_bmap.h" +#include "xfs_refcount_btree.h" /* * Physical superblock buffer manipulations. Shared with libxfs in userspace. @@ -737,6 +739,13 @@ xfs_sb_mount_common( mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2; mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2; + mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(mp, sbp->sb_blocksize, + true); + mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(mp, sbp->sb_blocksize, + false); + mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2; + mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2; + mp->m_bsize = XFS_FSB_TO_BB(mp, 1); mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, sbp->sb_inopblock); diff --git a/fs/xfs/libxfs/xfs_shared.h b/fs/xfs/libxfs/xfs_shared.h index 0c5b30bd884c..c6f4eb46fe26 100644 --- a/fs/xfs/libxfs/xfs_shared.h +++ b/fs/xfs/libxfs/xfs_shared.h @@ -39,6 +39,7 @@ extern const struct xfs_buf_ops xfs_agf_buf_ops; extern const struct xfs_buf_ops xfs_agfl_buf_ops; extern const struct xfs_buf_ops xfs_allocbt_buf_ops; extern const struct xfs_buf_ops xfs_rmapbt_buf_ops; +extern const struct xfs_buf_ops xfs_refcountbt_buf_ops; extern const struct xfs_buf_ops xfs_attr3_leaf_buf_ops; extern const struct xfs_buf_ops xfs_attr3_rmt_buf_ops; extern const struct xfs_buf_ops xfs_bmbt_buf_ops; @@ -122,6 +123,7 @@ int xfs_log_calc_minimum_size(struct xfs_mount *); #define XFS_INO_REF 2 #define XFS_ATTR_BTREE_REF 1 #define XFS_DQUOT_REF 1 +#define XFS_REFC_BTREE_REF 1 /* * Flags for xfs_trans_ichgtime(). diff --git a/fs/xfs/libxfs/xfs_trans_resv.c b/fs/xfs/libxfs/xfs_trans_resv.c index 301ef2f4dbd6..7c840e1c8bb6 100644 --- a/fs/xfs/libxfs/xfs_trans_resv.c +++ b/fs/xfs/libxfs/xfs_trans_resv.c @@ -73,7 +73,7 @@ xfs_calc_buf_res( * * Keep in mind that max depth is calculated separately for each type of tree. */ -static uint +uint xfs_allocfree_log_count( struct xfs_mount *mp, uint num_ops) diff --git a/fs/xfs/libxfs/xfs_trans_resv.h b/fs/xfs/libxfs/xfs_trans_resv.h index 0eb46ed6d404..36a15110c1fe 100644 --- a/fs/xfs/libxfs/xfs_trans_resv.h +++ b/fs/xfs/libxfs/xfs_trans_resv.h @@ -102,5 +102,6 @@ struct xfs_trans_resv { #define XFS_ATTRRM_LOG_COUNT 3 void xfs_trans_resv_calc(struct xfs_mount *mp, struct xfs_trans_resv *resp); +uint xfs_allocfree_log_count(struct xfs_mount *mp, uint num_ops); #endif /* __XFS_TRANS_RESV_H__ */ diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c index 56e85a6c85c7..3f64615f58db 100644 --- a/fs/xfs/xfs_mount.c +++ b/fs/xfs/xfs_mount.c @@ -43,6 +43,7 @@ #include "xfs_icache.h" #include "xfs_sysfs.h" #include "xfs_rmap_btree.h" +#include "xfs_refcount_btree.h" static DEFINE_MUTEX(xfs_uuid_table_mutex); @@ -684,6 +685,7 @@ xfs_mountfs( xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK); xfs_ialloc_compute_maxlevels(mp); xfs_rmapbt_compute_maxlevels(mp); + xfs_refcountbt_compute_maxlevels(mp); xfs_set_maxicount(mp); diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h index 8fab4962c4f1..0be14a76216a 100644 --- a/fs/xfs/xfs_mount.h +++ b/fs/xfs/xfs_mount.h @@ -124,10 +124,13 @@ typedef struct xfs_mount { uint m_inobt_mnr[2]; /* min inobt btree records */ uint m_rmap_mxr[2]; /* max rmap btree records */ uint m_rmap_mnr[2]; /* min rmap btree records */ + uint m_refc_mxr[2]; /* max refc btree records */ + uint m_refc_mnr[2]; /* min refc btree records */ uint m_ag_maxlevels; /* XFS_AG_MAXLEVELS */ uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */ uint m_in_maxlevels; /* max inobt btree levels. */ uint m_rmap_maxlevels; /* max rmap btree levels */ + uint m_refc_maxlevels; /* max refcount btree level */ xfs_extlen_t m_ag_prealloc_blocks; /* reserved ag blocks */ uint m_alloc_set_aside; /* space we can't use */ uint m_ag_max_usable; /* max space per AG */ diff --git a/fs/xfs/xfs_ondisk.h b/fs/xfs/xfs_ondisk.h index 69e2986a3776..0c381d71b242 100644 --- a/fs/xfs/xfs_ondisk.h +++ b/fs/xfs/xfs_ondisk.h @@ -49,6 +49,8 @@ xfs_check_ondisk_structs(void) XFS_CHECK_STRUCT_SIZE(struct xfs_dsymlink_hdr, 56); XFS_CHECK_STRUCT_SIZE(struct xfs_inobt_key, 4); XFS_CHECK_STRUCT_SIZE(struct xfs_inobt_rec, 16); + XFS_CHECK_STRUCT_SIZE(struct xfs_refcount_key, 4); + XFS_CHECK_STRUCT_SIZE(struct xfs_refcount_rec, 12); XFS_CHECK_STRUCT_SIZE(struct xfs_rmap_key, 20); XFS_CHECK_STRUCT_SIZE(struct xfs_rmap_rec, 24); XFS_CHECK_STRUCT_SIZE(struct xfs_timestamp, 8); @@ -56,6 +58,7 @@ xfs_check_ondisk_structs(void) XFS_CHECK_STRUCT_SIZE(xfs_alloc_ptr_t, 4); XFS_CHECK_STRUCT_SIZE(xfs_alloc_rec_t, 8); XFS_CHECK_STRUCT_SIZE(xfs_inobt_ptr_t, 4); + XFS_CHECK_STRUCT_SIZE(xfs_refcount_ptr_t, 4); XFS_CHECK_STRUCT_SIZE(xfs_rmap_ptr_t, 4); /* dir/attr trees */ diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 8446338929f6..c7b9853c7ae9 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -39,16 +39,7 @@ struct xfs_buf_log_format; struct xfs_inode_log_format; struct xfs_bmbt_irec; struct xfs_btree_cur; - -#ifndef XFS_REFCOUNT_IREC_PLACEHOLDER -#define XFS_REFCOUNT_IREC_PLACEHOLDER -/* Placeholder definition to avoid breaking bisectability. */ -struct xfs_refcount_irec { - xfs_agblock_t rc_startblock; /* starting block number */ - xfs_extlen_t rc_blockcount; /* count of free blocks */ - xfs_nlink_t rc_refcount; /* number of inodes linked here */ -}; -#endif +struct xfs_refcount_irec; DECLARE_EVENT_CLASS(xfs_attr_list_class, TP_PROTO(struct xfs_attr_list_context *ctx), -- cgit v1.2.3-59-g8ed1b From ac4fef69386afb1c25d6b900fe1fcf77b96ea567 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:18 -0700 Subject: xfs: add refcount btree support to growfs Modify the growfs code to initialize new refcount btree blocks. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_fsops.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) (limited to 'fs') diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c index 94ac06f3d908..4b4059b5e501 100644 --- a/fs/xfs/xfs_fsops.c +++ b/fs/xfs/xfs_fsops.c @@ -259,6 +259,12 @@ xfs_growfs_data_private( agf->agf_longest = cpu_to_be32(tmpsize); if (xfs_sb_version_hascrc(&mp->m_sb)) uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid); + if (xfs_sb_version_hasreflink(&mp->m_sb)) { + agf->agf_refcount_root = cpu_to_be32( + xfs_refc_block(mp)); + agf->agf_refcount_level = cpu_to_be32(1); + agf->agf_refcount_blocks = cpu_to_be32(1); + } error = xfs_bwrite(bp); xfs_buf_relse(bp); @@ -450,6 +456,17 @@ xfs_growfs_data_private( rrec->rm_offset = 0; be16_add_cpu(&block->bb_numrecs, 1); + /* account for refc btree root */ + if (xfs_sb_version_hasreflink(&mp->m_sb)) { + rrec = XFS_RMAP_REC_ADDR(block, 5); + rrec->rm_startblock = cpu_to_be32( + xfs_refc_block(mp)); + rrec->rm_blockcount = cpu_to_be32(1); + rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC); + rrec->rm_offset = 0; + be16_add_cpu(&block->bb_numrecs, 1); + } + error = xfs_bwrite(bp); xfs_buf_relse(bp); if (error) @@ -507,6 +524,28 @@ xfs_growfs_data_private( goto error0; } + /* + * refcount btree root block + */ + if (xfs_sb_version_hasreflink(&mp->m_sb)) { + bp = xfs_growfs_get_hdr_buf(mp, + XFS_AGB_TO_DADDR(mp, agno, xfs_refc_block(mp)), + BTOBB(mp->m_sb.sb_blocksize), 0, + &xfs_refcountbt_buf_ops); + if (!bp) { + error = -ENOMEM; + goto error0; + } + + xfs_btree_init_block(mp, bp, XFS_REFC_CRC_MAGIC, + 0, 0, agno, + XFS_BTREE_CRC_BLOCKS); + + error = xfs_bwrite(bp); + xfs_buf_relse(bp); + if (error) + goto error0; + } } xfs_trans_agblocks_delta(tp, nfree); /* -- cgit v1.2.3-59-g8ed1b From f310bd2ecd37b17bf0042c9d1595329057970eb6 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:19 -0700 Subject: xfs: account for the refcount btree in the alloc/free log reservation Every time we allocate or free a data extent, we might need to split the refcount btree. Reserve some blocks in the transaction to handle this possibility. Even though the deferred refcount code can roll a transaction to avoid overloading the transaction, we can still exceed the reservation. Certain pathological workloads (1k blocks, no cowextsize hint, random directio writes), cause a perfect storm wherein a refcount adjustment of a large range of blocks causes full tree splits in two separate extents in two separate refcount tree blocks; allocating new refcount tree blocks causes rmap btree splits; and all the allocation activity causes the freespace btrees to split, blowing the reservation. (Reproduced by generic/167 over NFS atop XFS) Signed-off-by: Christoph Hellwig [darrick.wong@oracle.com: add commit message] Signed-off-by: Darrick J. Wong --- fs/xfs/libxfs/xfs_trans_resv.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_trans_resv.c b/fs/xfs/libxfs/xfs_trans_resv.c index 7c840e1c8bb6..a59838f1627b 100644 --- a/fs/xfs/libxfs/xfs_trans_resv.c +++ b/fs/xfs/libxfs/xfs_trans_resv.c @@ -67,7 +67,8 @@ xfs_calc_buf_res( * Per-extent log reservation for the btree changes involved in freeing or * allocating an extent. In classic XFS there were two trees that will be * modified (bnobt + cntbt). With rmap enabled, there are three trees - * (rmapbt). The number of blocks reserved is based on the formula: + * (rmapbt). With reflink, there are four trees (refcountbt). The number of + * blocks reserved is based on the formula: * * num trees * ((2 blocks/level * max depth) - 1) * @@ -83,6 +84,8 @@ xfs_allocfree_log_count( blocks = num_ops * 2 * (2 * mp->m_ag_maxlevels - 1); if (xfs_sb_version_hasrmapbt(&mp->m_sb)) blocks += num_ops * (2 * mp->m_rmap_maxlevels - 1); + if (xfs_sb_version_hasreflink(&mp->m_sb)) + blocks += num_ops * (2 * mp->m_refc_maxlevels - 1); return blocks; } -- cgit v1.2.3-59-g8ed1b From bdf28630b72154e5766cbad5874576b6f22e7237 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:19 -0700 Subject: xfs: add refcount btree operations Implement the generic btree operations required to manipulate refcount btree blocks. The implementation is similar to the bmapbt, though it will only allocate and free blocks from the AG. Since the refcount root and level fields are separate from the existing roots and levels array, they need a separate logging flag. Signed-off-by: Darrick J. Wong [hch: fix logging of AGF refcount btree fields] Signed-off-by: Christoph Hellwig --- fs/xfs/Makefile | 1 + fs/xfs/libxfs/xfs_alloc.c | 3 + fs/xfs/libxfs/xfs_format.h | 10 +- fs/xfs/libxfs/xfs_refcount.c | 177 +++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_refcount.h | 30 ++++++ fs/xfs/libxfs/xfs_refcount_btree.c | 211 +++++++++++++++++++++++++++++++++++++ 6 files changed, 430 insertions(+), 2 deletions(-) create mode 100644 fs/xfs/libxfs/xfs_refcount.c create mode 100644 fs/xfs/libxfs/xfs_refcount.h (limited to 'fs') diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile index 8d749f2df99e..98b24279b75f 100644 --- a/fs/xfs/Makefile +++ b/fs/xfs/Makefile @@ -55,6 +55,7 @@ xfs-y += $(addprefix libxfs/, \ xfs_ag_resv.o \ xfs_rmap.o \ xfs_rmap_btree.o \ + xfs_refcount.o \ xfs_refcount_btree.o \ xfs_sb.o \ xfs_symlink_remote.o \ diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c index aa0e1ca7b6a5..be7e3fcefd73 100644 --- a/fs/xfs/libxfs/xfs_alloc.c +++ b/fs/xfs/libxfs/xfs_alloc.c @@ -2334,6 +2334,9 @@ xfs_alloc_log_agf( offsetof(xfs_agf_t, agf_btreeblks), offsetof(xfs_agf_t, agf_uuid), offsetof(xfs_agf_t, agf_rmap_blocks), + offsetof(xfs_agf_t, agf_refcount_blocks), + offsetof(xfs_agf_t, agf_refcount_root), + offsetof(xfs_agf_t, agf_refcount_level), /* needed so that we don't log the whole rest of the structure: */ offsetof(xfs_agf_t, agf_spare64), sizeof(xfs_agf_t) diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 97c74f4a22b5..8b826102dfe3 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -684,8 +684,11 @@ typedef struct xfs_agf { #define XFS_AGF_BTREEBLKS 0x00000800 #define XFS_AGF_UUID 0x00001000 #define XFS_AGF_RMAP_BLOCKS 0x00002000 -#define XFS_AGF_SPARE64 0x00004000 -#define XFS_AGF_NUM_BITS 15 +#define XFS_AGF_REFCOUNT_BLOCKS 0x00004000 +#define XFS_AGF_REFCOUNT_ROOT 0x00008000 +#define XFS_AGF_REFCOUNT_LEVEL 0x00010000 +#define XFS_AGF_SPARE64 0x00020000 +#define XFS_AGF_NUM_BITS 18 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) #define XFS_AGF_FLAGS \ @@ -703,6 +706,9 @@ typedef struct xfs_agf { { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ { XFS_AGF_UUID, "UUID" }, \ { XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \ + { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \ + { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \ + { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \ { XFS_AGF_SPARE64, "SPARE64" } /* disk block (xfs_daddr_t) in the AG */ diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c new file mode 100644 index 000000000000..de1340652933 --- /dev/null +++ b/fs/xfs/libxfs/xfs_refcount.c @@ -0,0 +1,177 @@ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_sb.h" +#include "xfs_mount.h" +#include "xfs_defer.h" +#include "xfs_btree.h" +#include "xfs_bmap.h" +#include "xfs_refcount_btree.h" +#include "xfs_alloc.h" +#include "xfs_error.h" +#include "xfs_trace.h" +#include "xfs_cksum.h" +#include "xfs_trans.h" +#include "xfs_bit.h" +#include "xfs_refcount.h" + +/* + * Look up the first record less than or equal to [bno, len] in the btree + * given by cur. + */ +int +xfs_refcount_lookup_le( + struct xfs_btree_cur *cur, + xfs_agblock_t bno, + int *stat) +{ + trace_xfs_refcount_lookup(cur->bc_mp, cur->bc_private.a.agno, bno, + XFS_LOOKUP_LE); + cur->bc_rec.rc.rc_startblock = bno; + cur->bc_rec.rc.rc_blockcount = 0; + return xfs_btree_lookup(cur, XFS_LOOKUP_LE, stat); +} + +/* + * Look up the first record greater than or equal to [bno, len] in the btree + * given by cur. + */ +int +xfs_refcount_lookup_ge( + struct xfs_btree_cur *cur, + xfs_agblock_t bno, + int *stat) +{ + trace_xfs_refcount_lookup(cur->bc_mp, cur->bc_private.a.agno, bno, + XFS_LOOKUP_GE); + cur->bc_rec.rc.rc_startblock = bno; + cur->bc_rec.rc.rc_blockcount = 0; + return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat); +} + +/* + * Get the data from the pointed-to record. + */ +int +xfs_refcount_get_rec( + struct xfs_btree_cur *cur, + struct xfs_refcount_irec *irec, + int *stat) +{ + union xfs_btree_rec *rec; + int error; + + error = xfs_btree_get_rec(cur, &rec, stat); + if (!error && *stat == 1) { + irec->rc_startblock = be32_to_cpu(rec->refc.rc_startblock); + irec->rc_blockcount = be32_to_cpu(rec->refc.rc_blockcount); + irec->rc_refcount = be32_to_cpu(rec->refc.rc_refcount); + trace_xfs_refcount_get(cur->bc_mp, cur->bc_private.a.agno, + irec); + } + return error; +} + +/* + * Update the record referred to by cur to the value given + * by [bno, len, refcount]. + * This either works (return 0) or gets an EFSCORRUPTED error. + */ +STATIC int +xfs_refcount_update( + struct xfs_btree_cur *cur, + struct xfs_refcount_irec *irec) +{ + union xfs_btree_rec rec; + int error; + + trace_xfs_refcount_update(cur->bc_mp, cur->bc_private.a.agno, irec); + rec.refc.rc_startblock = cpu_to_be32(irec->rc_startblock); + rec.refc.rc_blockcount = cpu_to_be32(irec->rc_blockcount); + rec.refc.rc_refcount = cpu_to_be32(irec->rc_refcount); + error = xfs_btree_update(cur, &rec); + if (error) + trace_xfs_refcount_update_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + +/* + * Insert the record referred to by cur to the value given + * by [bno, len, refcount]. + * This either works (return 0) or gets an EFSCORRUPTED error. + */ +STATIC int +xfs_refcount_insert( + struct xfs_btree_cur *cur, + struct xfs_refcount_irec *irec, + int *i) +{ + int error; + + trace_xfs_refcount_insert(cur->bc_mp, cur->bc_private.a.agno, irec); + cur->bc_rec.rc.rc_startblock = irec->rc_startblock; + cur->bc_rec.rc.rc_blockcount = irec->rc_blockcount; + cur->bc_rec.rc.rc_refcount = irec->rc_refcount; + error = xfs_btree_insert(cur, i); + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, *i == 1, out_error); +out_error: + if (error) + trace_xfs_refcount_insert_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + +/* + * Remove the record referred to by cur, then set the pointer to the spot + * where the record could be re-inserted, in case we want to increment or + * decrement the cursor. + * This either works (return 0) or gets an EFSCORRUPTED error. + */ +STATIC int +xfs_refcount_delete( + struct xfs_btree_cur *cur, + int *i) +{ + struct xfs_refcount_irec irec; + int found_rec; + int error; + + error = xfs_refcount_get_rec(cur, &irec, &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); + trace_xfs_refcount_delete(cur->bc_mp, cur->bc_private.a.agno, &irec); + error = xfs_btree_delete(cur, i); + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, *i == 1, out_error); + if (error) + goto out_error; + error = xfs_refcount_lookup_ge(cur, irec.rc_startblock, &found_rec); +out_error: + if (error) + trace_xfs_refcount_delete_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} diff --git a/fs/xfs/libxfs/xfs_refcount.h b/fs/xfs/libxfs/xfs_refcount.h new file mode 100644 index 000000000000..4dc335a1dc73 --- /dev/null +++ b/fs/xfs/libxfs/xfs_refcount.h @@ -0,0 +1,30 @@ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#ifndef __XFS_REFCOUNT_H__ +#define __XFS_REFCOUNT_H__ + +extern int xfs_refcount_lookup_le(struct xfs_btree_cur *cur, + xfs_agblock_t bno, int *stat); +extern int xfs_refcount_lookup_ge(struct xfs_btree_cur *cur, + xfs_agblock_t bno, int *stat); +extern int xfs_refcount_get_rec(struct xfs_btree_cur *cur, + struct xfs_refcount_irec *irec, int *stat); + +#endif /* __XFS_REFCOUNT_H__ */ diff --git a/fs/xfs/libxfs/xfs_refcount_btree.c b/fs/xfs/libxfs/xfs_refcount_btree.c index 359cf0c3a6b4..81d58b09af71 100644 --- a/fs/xfs/libxfs/xfs_refcount_btree.c +++ b/fs/xfs/libxfs/xfs_refcount_btree.c @@ -34,6 +34,7 @@ #include "xfs_cksum.h" #include "xfs_trans.h" #include "xfs_bit.h" +#include "xfs_rmap.h" static struct xfs_btree_cur * xfs_refcountbt_dup_cursor( @@ -44,6 +45,178 @@ xfs_refcountbt_dup_cursor( cur->bc_private.a.dfops); } +STATIC void +xfs_refcountbt_set_root( + struct xfs_btree_cur *cur, + union xfs_btree_ptr *ptr, + int inc) +{ + struct xfs_buf *agbp = cur->bc_private.a.agbp; + struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); + xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno); + struct xfs_perag *pag = xfs_perag_get(cur->bc_mp, seqno); + + ASSERT(ptr->s != 0); + + agf->agf_refcount_root = ptr->s; + be32_add_cpu(&agf->agf_refcount_level, inc); + pag->pagf_refcount_level += inc; + xfs_perag_put(pag); + + xfs_alloc_log_agf(cur->bc_tp, agbp, + XFS_AGF_REFCOUNT_ROOT | XFS_AGF_REFCOUNT_LEVEL); +} + +STATIC int +xfs_refcountbt_alloc_block( + struct xfs_btree_cur *cur, + union xfs_btree_ptr *start, + union xfs_btree_ptr *new, + int *stat) +{ + struct xfs_buf *agbp = cur->bc_private.a.agbp; + struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); + struct xfs_alloc_arg args; /* block allocation args */ + int error; /* error return value */ + + memset(&args, 0, sizeof(args)); + args.tp = cur->bc_tp; + args.mp = cur->bc_mp; + args.type = XFS_ALLOCTYPE_NEAR_BNO; + args.fsbno = XFS_AGB_TO_FSB(cur->bc_mp, cur->bc_private.a.agno, + xfs_refc_block(args.mp)); + args.firstblock = args.fsbno; + xfs_rmap_ag_owner(&args.oinfo, XFS_RMAP_OWN_REFC); + args.minlen = args.maxlen = args.prod = 1; + + error = xfs_alloc_vextent(&args); + if (error) + goto out_error; + trace_xfs_refcountbt_alloc_block(cur->bc_mp, cur->bc_private.a.agno, + args.agbno, 1); + if (args.fsbno == NULLFSBLOCK) { + XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT); + *stat = 0; + return 0; + } + ASSERT(args.agno == cur->bc_private.a.agno); + ASSERT(args.len == 1); + + new->s = cpu_to_be32(args.agbno); + be32_add_cpu(&agf->agf_refcount_blocks, 1); + xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS); + + XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT); + *stat = 1; + return 0; + +out_error: + XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR); + return error; +} + +STATIC int +xfs_refcountbt_free_block( + struct xfs_btree_cur *cur, + struct xfs_buf *bp) +{ + struct xfs_mount *mp = cur->bc_mp; + struct xfs_buf *agbp = cur->bc_private.a.agbp; + struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); + xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp)); + struct xfs_owner_info oinfo; + + trace_xfs_refcountbt_free_block(cur->bc_mp, cur->bc_private.a.agno, + XFS_FSB_TO_AGBNO(cur->bc_mp, fsbno), 1); + xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_REFC); + be32_add_cpu(&agf->agf_refcount_blocks, -1); + xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS); + xfs_bmap_add_free(mp, cur->bc_private.a.dfops, fsbno, 1, + &oinfo); + + return 0; +} + +STATIC int +xfs_refcountbt_get_minrecs( + struct xfs_btree_cur *cur, + int level) +{ + return cur->bc_mp->m_refc_mnr[level != 0]; +} + +STATIC int +xfs_refcountbt_get_maxrecs( + struct xfs_btree_cur *cur, + int level) +{ + return cur->bc_mp->m_refc_mxr[level != 0]; +} + +STATIC void +xfs_refcountbt_init_key_from_rec( + union xfs_btree_key *key, + union xfs_btree_rec *rec) +{ + key->refc.rc_startblock = rec->refc.rc_startblock; +} + +STATIC void +xfs_refcountbt_init_high_key_from_rec( + union xfs_btree_key *key, + union xfs_btree_rec *rec) +{ + __u32 x; + + x = be32_to_cpu(rec->refc.rc_startblock); + x += be32_to_cpu(rec->refc.rc_blockcount) - 1; + key->refc.rc_startblock = cpu_to_be32(x); +} + +STATIC void +xfs_refcountbt_init_rec_from_cur( + struct xfs_btree_cur *cur, + union xfs_btree_rec *rec) +{ + rec->refc.rc_startblock = cpu_to_be32(cur->bc_rec.rc.rc_startblock); + rec->refc.rc_blockcount = cpu_to_be32(cur->bc_rec.rc.rc_blockcount); + rec->refc.rc_refcount = cpu_to_be32(cur->bc_rec.rc.rc_refcount); +} + +STATIC void +xfs_refcountbt_init_ptr_from_cur( + struct xfs_btree_cur *cur, + union xfs_btree_ptr *ptr) +{ + struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp); + + ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno)); + ASSERT(agf->agf_refcount_root != 0); + + ptr->s = agf->agf_refcount_root; +} + +STATIC __int64_t +xfs_refcountbt_key_diff( + struct xfs_btree_cur *cur, + union xfs_btree_key *key) +{ + struct xfs_refcount_irec *rec = &cur->bc_rec.rc; + struct xfs_refcount_key *kp = &key->refc; + + return (__int64_t)be32_to_cpu(kp->rc_startblock) - rec->rc_startblock; +} + +STATIC __int64_t +xfs_refcountbt_diff_two_keys( + struct xfs_btree_cur *cur, + union xfs_btree_key *k1, + union xfs_btree_key *k2) +{ + return (__int64_t)be32_to_cpu(k1->refc.rc_startblock) - + be32_to_cpu(k2->refc.rc_startblock); +} + STATIC bool xfs_refcountbt_verify( struct xfs_buf *bp) @@ -106,12 +279,50 @@ const struct xfs_buf_ops xfs_refcountbt_buf_ops = { .verify_write = xfs_refcountbt_write_verify, }; +#if defined(DEBUG) || defined(XFS_WARN) +STATIC int +xfs_refcountbt_keys_inorder( + struct xfs_btree_cur *cur, + union xfs_btree_key *k1, + union xfs_btree_key *k2) +{ + return be32_to_cpu(k1->refc.rc_startblock) < + be32_to_cpu(k2->refc.rc_startblock); +} + +STATIC int +xfs_refcountbt_recs_inorder( + struct xfs_btree_cur *cur, + union xfs_btree_rec *r1, + union xfs_btree_rec *r2) +{ + return be32_to_cpu(r1->refc.rc_startblock) + + be32_to_cpu(r1->refc.rc_blockcount) <= + be32_to_cpu(r2->refc.rc_startblock); +} +#endif + static const struct xfs_btree_ops xfs_refcountbt_ops = { .rec_len = sizeof(struct xfs_refcount_rec), .key_len = sizeof(struct xfs_refcount_key), .dup_cursor = xfs_refcountbt_dup_cursor, + .set_root = xfs_refcountbt_set_root, + .alloc_block = xfs_refcountbt_alloc_block, + .free_block = xfs_refcountbt_free_block, + .get_minrecs = xfs_refcountbt_get_minrecs, + .get_maxrecs = xfs_refcountbt_get_maxrecs, + .init_key_from_rec = xfs_refcountbt_init_key_from_rec, + .init_high_key_from_rec = xfs_refcountbt_init_high_key_from_rec, + .init_rec_from_cur = xfs_refcountbt_init_rec_from_cur, + .init_ptr_from_cur = xfs_refcountbt_init_ptr_from_cur, + .key_diff = xfs_refcountbt_key_diff, .buf_ops = &xfs_refcountbt_buf_ops, + .diff_two_keys = xfs_refcountbt_diff_two_keys, +#if defined(DEBUG) || defined(XFS_WARN) + .keys_inorder = xfs_refcountbt_keys_inorder, + .recs_inorder = xfs_refcountbt_recs_inorder, +#endif }; /* -- cgit v1.2.3-59-g8ed1b From baf4bcacb715cebd412b2f4bb69989ef24496523 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:20 -0700 Subject: xfs: create refcount update intent log items Create refcount update intent/done log items to record redo information in the log. Because we need to roll transactions between updating the bmbt mapping and updating the reverse mapping, we also have to track the status of the metadata updates that will be recorded in the post-roll transactions, just in case we crash before committing the final transaction. This mechanism enables log recovery to finish what was already started. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/Makefile | 1 + fs/xfs/libxfs/xfs_log_format.h | 58 ++++++- fs/xfs/xfs_refcount_item.c | 383 +++++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_refcount_item.h | 100 +++++++++++ fs/xfs/xfs_super.c | 18 ++ 5 files changed, 558 insertions(+), 2 deletions(-) create mode 100644 fs/xfs/xfs_refcount_item.c create mode 100644 fs/xfs/xfs_refcount_item.h (limited to 'fs') diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile index 98b24279b75f..d6429fd13774 100644 --- a/fs/xfs/Makefile +++ b/fs/xfs/Makefile @@ -106,6 +106,7 @@ xfs-y += xfs_log.o \ xfs_extfree_item.o \ xfs_icreate_item.o \ xfs_inode_item.o \ + xfs_refcount_item.o \ xfs_rmap_item.o \ xfs_log_recover.o \ xfs_trans_ail.o \ diff --git a/fs/xfs/libxfs/xfs_log_format.h b/fs/xfs/libxfs/xfs_log_format.h index fc5eef85d61e..3659f04016c0 100644 --- a/fs/xfs/libxfs/xfs_log_format.h +++ b/fs/xfs/libxfs/xfs_log_format.h @@ -112,7 +112,9 @@ static inline uint xlog_get_cycle(char *ptr) #define XLOG_REG_TYPE_ICREATE 20 #define XLOG_REG_TYPE_RUI_FORMAT 21 #define XLOG_REG_TYPE_RUD_FORMAT 22 -#define XLOG_REG_TYPE_MAX 22 +#define XLOG_REG_TYPE_CUI_FORMAT 23 +#define XLOG_REG_TYPE_CUD_FORMAT 24 +#define XLOG_REG_TYPE_MAX 24 /* * Flags to log operation header @@ -231,6 +233,8 @@ typedef struct xfs_trans_header { #define XFS_LI_ICREATE 0x123f #define XFS_LI_RUI 0x1240 /* rmap update intent */ #define XFS_LI_RUD 0x1241 +#define XFS_LI_CUI 0x1242 /* refcount update intent */ +#define XFS_LI_CUD 0x1243 #define XFS_LI_TYPE_DESC \ { XFS_LI_EFI, "XFS_LI_EFI" }, \ @@ -242,7 +246,9 @@ typedef struct xfs_trans_header { { XFS_LI_QUOTAOFF, "XFS_LI_QUOTAOFF" }, \ { XFS_LI_ICREATE, "XFS_LI_ICREATE" }, \ { XFS_LI_RUI, "XFS_LI_RUI" }, \ - { XFS_LI_RUD, "XFS_LI_RUD" } + { XFS_LI_RUD, "XFS_LI_RUD" }, \ + { XFS_LI_CUI, "XFS_LI_CUI" }, \ + { XFS_LI_CUD, "XFS_LI_CUD" } /* * Inode Log Item Format definitions. @@ -670,6 +676,54 @@ struct xfs_rud_log_format { __uint64_t rud_rui_id; /* id of corresponding rui */ }; +/* + * CUI/CUD (refcount update) log format definitions + */ +struct xfs_phys_extent { + __uint64_t pe_startblock; + __uint32_t pe_len; + __uint32_t pe_flags; +}; + +/* refcount pe_flags: upper bits are flags, lower byte is type code */ +/* Type codes are taken directly from enum xfs_refcount_intent_type. */ +#define XFS_REFCOUNT_EXTENT_TYPE_MASK 0xFF + +#define XFS_REFCOUNT_EXTENT_FLAGS (XFS_REFCOUNT_EXTENT_TYPE_MASK) + +/* + * This is the structure used to lay out a cui log item in the + * log. The cui_extents field is a variable size array whose + * size is given by cui_nextents. + */ +struct xfs_cui_log_format { + __uint16_t cui_type; /* cui log item type */ + __uint16_t cui_size; /* size of this item */ + __uint32_t cui_nextents; /* # extents to free */ + __uint64_t cui_id; /* cui identifier */ + struct xfs_phys_extent cui_extents[]; /* array of extents */ +}; + +static inline size_t +xfs_cui_log_format_sizeof( + unsigned int nr) +{ + return sizeof(struct xfs_cui_log_format) + + nr * sizeof(struct xfs_phys_extent); +} + +/* + * This is the structure used to lay out a cud log item in the + * log. The cud_extents array is a variable size array whose + * size is given by cud_nextents; + */ +struct xfs_cud_log_format { + __uint16_t cud_type; /* cud log item type */ + __uint16_t cud_size; /* size of this item */ + __uint32_t __pad; + __uint64_t cud_cui_id; /* id of corresponding cui */ +}; + /* * Dquot Log format definitions. * diff --git a/fs/xfs/xfs_refcount_item.c b/fs/xfs/xfs_refcount_item.c new file mode 100644 index 000000000000..f9ad05529eba --- /dev/null +++ b/fs/xfs/xfs_refcount_item.c @@ -0,0 +1,383 @@ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_mount.h" +#include "xfs_trans.h" +#include "xfs_trans_priv.h" +#include "xfs_buf_item.h" +#include "xfs_refcount_item.h" +#include "xfs_log.h" + + +kmem_zone_t *xfs_cui_zone; +kmem_zone_t *xfs_cud_zone; + +static inline struct xfs_cui_log_item *CUI_ITEM(struct xfs_log_item *lip) +{ + return container_of(lip, struct xfs_cui_log_item, cui_item); +} + +void +xfs_cui_item_free( + struct xfs_cui_log_item *cuip) +{ + if (cuip->cui_format.cui_nextents > XFS_CUI_MAX_FAST_EXTENTS) + kmem_free(cuip); + else + kmem_zone_free(xfs_cui_zone, cuip); +} + +STATIC void +xfs_cui_item_size( + struct xfs_log_item *lip, + int *nvecs, + int *nbytes) +{ + struct xfs_cui_log_item *cuip = CUI_ITEM(lip); + + *nvecs += 1; + *nbytes += xfs_cui_log_format_sizeof(cuip->cui_format.cui_nextents); +} + +/* + * This is called to fill in the vector of log iovecs for the + * given cui log item. We use only 1 iovec, and we point that + * at the cui_log_format structure embedded in the cui item. + * It is at this point that we assert that all of the extent + * slots in the cui item have been filled. + */ +STATIC void +xfs_cui_item_format( + struct xfs_log_item *lip, + struct xfs_log_vec *lv) +{ + struct xfs_cui_log_item *cuip = CUI_ITEM(lip); + struct xfs_log_iovec *vecp = NULL; + + ASSERT(atomic_read(&cuip->cui_next_extent) == + cuip->cui_format.cui_nextents); + + cuip->cui_format.cui_type = XFS_LI_CUI; + cuip->cui_format.cui_size = 1; + + xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_CUI_FORMAT, &cuip->cui_format, + xfs_cui_log_format_sizeof(cuip->cui_format.cui_nextents)); +} + +/* + * Pinning has no meaning for an cui item, so just return. + */ +STATIC void +xfs_cui_item_pin( + struct xfs_log_item *lip) +{ +} + +/* + * The unpin operation is the last place an CUI is manipulated in the log. It is + * either inserted in the AIL or aborted in the event of a log I/O error. In + * either case, the CUI transaction has been successfully committed to make it + * this far. Therefore, we expect whoever committed the CUI to either construct + * and commit the CUD or drop the CUD's reference in the event of error. Simply + * drop the log's CUI reference now that the log is done with it. + */ +STATIC void +xfs_cui_item_unpin( + struct xfs_log_item *lip, + int remove) +{ + struct xfs_cui_log_item *cuip = CUI_ITEM(lip); + + xfs_cui_release(cuip); +} + +/* + * CUI items have no locking or pushing. However, since CUIs are pulled from + * the AIL when their corresponding CUDs are committed to disk, their situation + * is very similar to being pinned. Return XFS_ITEM_PINNED so that the caller + * will eventually flush the log. This should help in getting the CUI out of + * the AIL. + */ +STATIC uint +xfs_cui_item_push( + struct xfs_log_item *lip, + struct list_head *buffer_list) +{ + return XFS_ITEM_PINNED; +} + +/* + * The CUI has been either committed or aborted if the transaction has been + * cancelled. If the transaction was cancelled, an CUD isn't going to be + * constructed and thus we free the CUI here directly. + */ +STATIC void +xfs_cui_item_unlock( + struct xfs_log_item *lip) +{ + if (lip->li_flags & XFS_LI_ABORTED) + xfs_cui_item_free(CUI_ITEM(lip)); +} + +/* + * The CUI is logged only once and cannot be moved in the log, so simply return + * the lsn at which it's been logged. + */ +STATIC xfs_lsn_t +xfs_cui_item_committed( + struct xfs_log_item *lip, + xfs_lsn_t lsn) +{ + return lsn; +} + +/* + * The CUI dependency tracking op doesn't do squat. It can't because + * it doesn't know where the free extent is coming from. The dependency + * tracking has to be handled by the "enclosing" metadata object. For + * example, for inodes, the inode is locked throughout the extent freeing + * so the dependency should be recorded there. + */ +STATIC void +xfs_cui_item_committing( + struct xfs_log_item *lip, + xfs_lsn_t lsn) +{ +} + +/* + * This is the ops vector shared by all cui log items. + */ +static const struct xfs_item_ops xfs_cui_item_ops = { + .iop_size = xfs_cui_item_size, + .iop_format = xfs_cui_item_format, + .iop_pin = xfs_cui_item_pin, + .iop_unpin = xfs_cui_item_unpin, + .iop_unlock = xfs_cui_item_unlock, + .iop_committed = xfs_cui_item_committed, + .iop_push = xfs_cui_item_push, + .iop_committing = xfs_cui_item_committing, +}; + +/* + * Allocate and initialize an cui item with the given number of extents. + */ +struct xfs_cui_log_item * +xfs_cui_init( + struct xfs_mount *mp, + uint nextents) + +{ + struct xfs_cui_log_item *cuip; + + ASSERT(nextents > 0); + if (nextents > XFS_CUI_MAX_FAST_EXTENTS) + cuip = kmem_zalloc(xfs_cui_log_item_sizeof(nextents), + KM_SLEEP); + else + cuip = kmem_zone_zalloc(xfs_cui_zone, KM_SLEEP); + + xfs_log_item_init(mp, &cuip->cui_item, XFS_LI_CUI, &xfs_cui_item_ops); + cuip->cui_format.cui_nextents = nextents; + cuip->cui_format.cui_id = (uintptr_t)(void *)cuip; + atomic_set(&cuip->cui_next_extent, 0); + atomic_set(&cuip->cui_refcount, 2); + + return cuip; +} + +/* + * Freeing the CUI requires that we remove it from the AIL if it has already + * been placed there. However, the CUI may not yet have been placed in the AIL + * when called by xfs_cui_release() from CUD processing due to the ordering of + * committed vs unpin operations in bulk insert operations. Hence the reference + * count to ensure only the last caller frees the CUI. + */ +void +xfs_cui_release( + struct xfs_cui_log_item *cuip) +{ + if (atomic_dec_and_test(&cuip->cui_refcount)) { + xfs_trans_ail_remove(&cuip->cui_item, SHUTDOWN_LOG_IO_ERROR); + xfs_cui_item_free(cuip); + } +} + +static inline struct xfs_cud_log_item *CUD_ITEM(struct xfs_log_item *lip) +{ + return container_of(lip, struct xfs_cud_log_item, cud_item); +} + +STATIC void +xfs_cud_item_size( + struct xfs_log_item *lip, + int *nvecs, + int *nbytes) +{ + *nvecs += 1; + *nbytes += sizeof(struct xfs_cud_log_format); +} + +/* + * This is called to fill in the vector of log iovecs for the + * given cud log item. We use only 1 iovec, and we point that + * at the cud_log_format structure embedded in the cud item. + * It is at this point that we assert that all of the extent + * slots in the cud item have been filled. + */ +STATIC void +xfs_cud_item_format( + struct xfs_log_item *lip, + struct xfs_log_vec *lv) +{ + struct xfs_cud_log_item *cudp = CUD_ITEM(lip); + struct xfs_log_iovec *vecp = NULL; + + cudp->cud_format.cud_type = XFS_LI_CUD; + cudp->cud_format.cud_size = 1; + + xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_CUD_FORMAT, &cudp->cud_format, + sizeof(struct xfs_cud_log_format)); +} + +/* + * Pinning has no meaning for an cud item, so just return. + */ +STATIC void +xfs_cud_item_pin( + struct xfs_log_item *lip) +{ +} + +/* + * Since pinning has no meaning for an cud item, unpinning does + * not either. + */ +STATIC void +xfs_cud_item_unpin( + struct xfs_log_item *lip, + int remove) +{ +} + +/* + * There isn't much you can do to push on an cud item. It is simply stuck + * waiting for the log to be flushed to disk. + */ +STATIC uint +xfs_cud_item_push( + struct xfs_log_item *lip, + struct list_head *buffer_list) +{ + return XFS_ITEM_PINNED; +} + +/* + * The CUD is either committed or aborted if the transaction is cancelled. If + * the transaction is cancelled, drop our reference to the CUI and free the + * CUD. + */ +STATIC void +xfs_cud_item_unlock( + struct xfs_log_item *lip) +{ + struct xfs_cud_log_item *cudp = CUD_ITEM(lip); + + if (lip->li_flags & XFS_LI_ABORTED) { + xfs_cui_release(cudp->cud_cuip); + kmem_zone_free(xfs_cud_zone, cudp); + } +} + +/* + * When the cud item is committed to disk, all we need to do is delete our + * reference to our partner cui item and then free ourselves. Since we're + * freeing ourselves we must return -1 to keep the transaction code from + * further referencing this item. + */ +STATIC xfs_lsn_t +xfs_cud_item_committed( + struct xfs_log_item *lip, + xfs_lsn_t lsn) +{ + struct xfs_cud_log_item *cudp = CUD_ITEM(lip); + + /* + * Drop the CUI reference regardless of whether the CUD has been + * aborted. Once the CUD transaction is constructed, it is the sole + * responsibility of the CUD to release the CUI (even if the CUI is + * aborted due to log I/O error). + */ + xfs_cui_release(cudp->cud_cuip); + kmem_zone_free(xfs_cud_zone, cudp); + + return (xfs_lsn_t)-1; +} + +/* + * The CUD dependency tracking op doesn't do squat. It can't because + * it doesn't know where the free extent is coming from. The dependency + * tracking has to be handled by the "enclosing" metadata object. For + * example, for inodes, the inode is locked throughout the extent freeing + * so the dependency should be recorded there. + */ +STATIC void +xfs_cud_item_committing( + struct xfs_log_item *lip, + xfs_lsn_t lsn) +{ +} + +/* + * This is the ops vector shared by all cud log items. + */ +static const struct xfs_item_ops xfs_cud_item_ops = { + .iop_size = xfs_cud_item_size, + .iop_format = xfs_cud_item_format, + .iop_pin = xfs_cud_item_pin, + .iop_unpin = xfs_cud_item_unpin, + .iop_unlock = xfs_cud_item_unlock, + .iop_committed = xfs_cud_item_committed, + .iop_push = xfs_cud_item_push, + .iop_committing = xfs_cud_item_committing, +}; + +/* + * Allocate and initialize an cud item with the given number of extents. + */ +struct xfs_cud_log_item * +xfs_cud_init( + struct xfs_mount *mp, + struct xfs_cui_log_item *cuip) + +{ + struct xfs_cud_log_item *cudp; + + cudp = kmem_zone_zalloc(xfs_cud_zone, KM_SLEEP); + xfs_log_item_init(mp, &cudp->cud_item, XFS_LI_CUD, &xfs_cud_item_ops); + cudp->cud_cuip = cuip; + cudp->cud_format.cud_cui_id = cuip->cui_format.cui_id; + + return cudp; +} diff --git a/fs/xfs/xfs_refcount_item.h b/fs/xfs/xfs_refcount_item.h new file mode 100644 index 000000000000..34b6f7a8c149 --- /dev/null +++ b/fs/xfs/xfs_refcount_item.h @@ -0,0 +1,100 @@ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#ifndef __XFS_REFCOUNT_ITEM_H__ +#define __XFS_REFCOUNT_ITEM_H__ + +/* + * There are (currently) two pairs of refcount btree redo item types: + * increase and decrease. The log items for these are CUI (refcount + * update intent) and CUD (refcount update done). The redo item type + * is encoded in the flags field of each xfs_map_extent. + * + * *I items should be recorded in the *first* of a series of rolled + * transactions, and the *D items should be recorded in the same + * transaction that records the associated refcountbt updates. + * + * Should the system crash after the commit of the first transaction + * but before the commit of the final transaction in a series, log + * recovery will use the redo information recorded by the intent items + * to replay the refcountbt metadata updates. + */ + +/* kernel only CUI/CUD definitions */ + +struct xfs_mount; +struct kmem_zone; + +/* + * Max number of extents in fast allocation path. + */ +#define XFS_CUI_MAX_FAST_EXTENTS 16 + +/* + * Define CUI flag bits. Manipulated by set/clear/test_bit operators. + */ +#define XFS_CUI_RECOVERED 1 + +/* + * This is the "refcount update intent" log item. It is used to log + * the fact that some reverse mappings need to change. It is used in + * conjunction with the "refcount update done" log item described + * below. + * + * These log items follow the same rules as struct xfs_efi_log_item; + * see the comments about that structure (in xfs_extfree_item.h) for + * more details. + */ +struct xfs_cui_log_item { + struct xfs_log_item cui_item; + atomic_t cui_refcount; + atomic_t cui_next_extent; + unsigned long cui_flags; /* misc flags */ + struct xfs_cui_log_format cui_format; +}; + +static inline size_t +xfs_cui_log_item_sizeof( + unsigned int nr) +{ + return offsetof(struct xfs_cui_log_item, cui_format) + + xfs_cui_log_format_sizeof(nr); +} + +/* + * This is the "refcount update done" log item. It is used to log the + * fact that some refcountbt updates mentioned in an earlier cui item + * have been performed. + */ +struct xfs_cud_log_item { + struct xfs_log_item cud_item; + struct xfs_cui_log_item *cud_cuip; + struct xfs_cud_log_format cud_format; +}; + +extern struct kmem_zone *xfs_cui_zone; +extern struct kmem_zone *xfs_cud_zone; + +struct xfs_cui_log_item *xfs_cui_init(struct xfs_mount *, uint); +struct xfs_cud_log_item *xfs_cud_init(struct xfs_mount *, + struct xfs_cui_log_item *); +void xfs_cui_item_free(struct xfs_cui_log_item *); +void xfs_cui_release(struct xfs_cui_log_item *); + +#endif /* __XFS_REFCOUNT_ITEM_H__ */ diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 2d092f9577ca..abe69c656ed0 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -47,6 +47,7 @@ #include "xfs_sysfs.h" #include "xfs_ondisk.h" #include "xfs_rmap_item.h" +#include "xfs_refcount_item.h" #include #include @@ -1788,8 +1789,23 @@ xfs_init_zones(void) if (!xfs_rui_zone) goto out_destroy_rud_zone; + xfs_cud_zone = kmem_zone_init(sizeof(struct xfs_cud_log_item), + "xfs_cud_item"); + if (!xfs_cud_zone) + goto out_destroy_rui_zone; + + xfs_cui_zone = kmem_zone_init( + xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS), + "xfs_cui_item"); + if (!xfs_cui_zone) + goto out_destroy_cud_zone; + return 0; + out_destroy_cud_zone: + kmem_zone_destroy(xfs_cud_zone); + out_destroy_rui_zone: + kmem_zone_destroy(xfs_rui_zone); out_destroy_rud_zone: kmem_zone_destroy(xfs_rud_zone); out_destroy_icreate_zone: @@ -1832,6 +1848,8 @@ xfs_destroy_zones(void) * destroy caches. */ rcu_barrier(); + kmem_zone_destroy(xfs_cui_zone); + kmem_zone_destroy(xfs_cud_zone); kmem_zone_destroy(xfs_rui_zone); kmem_zone_destroy(xfs_rud_zone); kmem_zone_destroy(xfs_icreate_zone); -- cgit v1.2.3-59-g8ed1b From f997ee2137175f5b2bd7ced52acf1ca51f04f420 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:21 -0700 Subject: xfs: log refcount intent items Provide a mechanism for higher levels to create CUI/CUD items, submit them to the log, and a stub function to deal with recovered CUI items. These parts will be connected to the refcountbt in a later patch. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/Makefile | 1 + fs/xfs/libxfs/xfs_refcount.h | 14 ++++ fs/xfs/xfs_log_recover.c | 175 +++++++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_refcount_item.c | 60 +++++++++++++++ fs/xfs/xfs_refcount_item.h | 1 + fs/xfs/xfs_trace.h | 33 ++++++++ fs/xfs/xfs_trans.h | 11 +++ fs/xfs/xfs_trans_refcount.c | 80 ++++++++++++++++++++ 8 files changed, 375 insertions(+) create mode 100644 fs/xfs/xfs_trans_refcount.c (limited to 'fs') diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile index d6429fd13774..6a9ea9ed7efc 100644 --- a/fs/xfs/Makefile +++ b/fs/xfs/Makefile @@ -113,6 +113,7 @@ xfs-y += xfs_log.o \ xfs_trans_buf.o \ xfs_trans_extfree.o \ xfs_trans_inode.o \ + xfs_trans_refcount.o \ xfs_trans_rmap.o \ # optional features diff --git a/fs/xfs/libxfs/xfs_refcount.h b/fs/xfs/libxfs/xfs_refcount.h index 4dc335a1dc73..67b1c13fb714 100644 --- a/fs/xfs/libxfs/xfs_refcount.h +++ b/fs/xfs/libxfs/xfs_refcount.h @@ -27,4 +27,18 @@ extern int xfs_refcount_lookup_ge(struct xfs_btree_cur *cur, extern int xfs_refcount_get_rec(struct xfs_btree_cur *cur, struct xfs_refcount_irec *irec, int *stat); +enum xfs_refcount_intent_type { + XFS_REFCOUNT_INCREASE = 1, + XFS_REFCOUNT_DECREASE, + XFS_REFCOUNT_ALLOC_COW, + XFS_REFCOUNT_FREE_COW, +}; + +struct xfs_refcount_intent { + struct list_head ri_list; + enum xfs_refcount_intent_type ri_type; + xfs_fsblock_t ri_startblock; + xfs_extlen_t ri_blockcount; +}; + #endif /* __XFS_REFCOUNT_H__ */ diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c index 846483d56949..7def6723b857 100644 --- a/fs/xfs/xfs_log_recover.c +++ b/fs/xfs/xfs_log_recover.c @@ -45,6 +45,7 @@ #include "xfs_dir2.h" #include "xfs_rmap_item.h" #include "xfs_buf_item.h" +#include "xfs_refcount_item.h" #define BLK_AVG(blk1, blk2) ((blk1+blk2) >> 1) @@ -1924,6 +1925,8 @@ xlog_recover_reorder_trans( case XFS_LI_EFI: case XFS_LI_RUI: case XFS_LI_RUD: + case XFS_LI_CUI: + case XFS_LI_CUD: trace_xfs_log_recover_item_reorder_tail(log, trans, item, pass); list_move_tail(&item->ri_list, &inode_list); @@ -3546,6 +3549,123 @@ xlog_recover_rud_pass2( return 0; } +/* + * Copy an CUI format buffer from the given buf, and into the destination + * CUI format structure. The CUI/CUD items were designed not to need any + * special alignment handling. + */ +static int +xfs_cui_copy_format( + struct xfs_log_iovec *buf, + struct xfs_cui_log_format *dst_cui_fmt) +{ + struct xfs_cui_log_format *src_cui_fmt; + uint len; + + src_cui_fmt = buf->i_addr; + len = xfs_cui_log_format_sizeof(src_cui_fmt->cui_nextents); + + if (buf->i_len == len) { + memcpy(dst_cui_fmt, src_cui_fmt, len); + return 0; + } + return -EFSCORRUPTED; +} + +/* + * This routine is called to create an in-core extent refcount update + * item from the cui format structure which was logged on disk. + * It allocates an in-core cui, copies the extents from the format + * structure into it, and adds the cui to the AIL with the given + * LSN. + */ +STATIC int +xlog_recover_cui_pass2( + struct xlog *log, + struct xlog_recover_item *item, + xfs_lsn_t lsn) +{ + int error; + struct xfs_mount *mp = log->l_mp; + struct xfs_cui_log_item *cuip; + struct xfs_cui_log_format *cui_formatp; + + cui_formatp = item->ri_buf[0].i_addr; + + cuip = xfs_cui_init(mp, cui_formatp->cui_nextents); + error = xfs_cui_copy_format(&item->ri_buf[0], &cuip->cui_format); + if (error) { + xfs_cui_item_free(cuip); + return error; + } + atomic_set(&cuip->cui_next_extent, cui_formatp->cui_nextents); + + spin_lock(&log->l_ailp->xa_lock); + /* + * The CUI has two references. One for the CUD and one for CUI to ensure + * it makes it into the AIL. Insert the CUI into the AIL directly and + * drop the CUI reference. Note that xfs_trans_ail_update() drops the + * AIL lock. + */ + xfs_trans_ail_update(log->l_ailp, &cuip->cui_item, lsn); + xfs_cui_release(cuip); + return 0; +} + + +/* + * This routine is called when an CUD format structure is found in a committed + * transaction in the log. Its purpose is to cancel the corresponding CUI if it + * was still in the log. To do this it searches the AIL for the CUI with an id + * equal to that in the CUD format structure. If we find it we drop the CUD + * reference, which removes the CUI from the AIL and frees it. + */ +STATIC int +xlog_recover_cud_pass2( + struct xlog *log, + struct xlog_recover_item *item) +{ + struct xfs_cud_log_format *cud_formatp; + struct xfs_cui_log_item *cuip = NULL; + struct xfs_log_item *lip; + __uint64_t cui_id; + struct xfs_ail_cursor cur; + struct xfs_ail *ailp = log->l_ailp; + + cud_formatp = item->ri_buf[0].i_addr; + if (item->ri_buf[0].i_len != sizeof(struct xfs_cud_log_format)) + return -EFSCORRUPTED; + cui_id = cud_formatp->cud_cui_id; + + /* + * Search for the CUI with the id in the CUD format structure in the + * AIL. + */ + spin_lock(&ailp->xa_lock); + lip = xfs_trans_ail_cursor_first(ailp, &cur, 0); + while (lip != NULL) { + if (lip->li_type == XFS_LI_CUI) { + cuip = (struct xfs_cui_log_item *)lip; + if (cuip->cui_format.cui_id == cui_id) { + /* + * Drop the CUD reference to the CUI. This + * removes the CUI from the AIL and frees it. + */ + spin_unlock(&ailp->xa_lock); + xfs_cui_release(cuip); + spin_lock(&ailp->xa_lock); + break; + } + } + lip = xfs_trans_ail_cursor_next(ailp, &cur); + } + + xfs_trans_ail_cursor_done(&cur); + spin_unlock(&ailp->xa_lock); + + return 0; +} + /* * This routine is called when an inode create format structure is found in a * committed transaction in the log. It's purpose is to initialise the inodes @@ -3773,6 +3893,8 @@ xlog_recover_ra_pass2( case XFS_LI_QUOTAOFF: case XFS_LI_RUI: case XFS_LI_RUD: + case XFS_LI_CUI: + case XFS_LI_CUD: default: break; } @@ -3798,6 +3920,8 @@ xlog_recover_commit_pass1( case XFS_LI_ICREATE: case XFS_LI_RUI: case XFS_LI_RUD: + case XFS_LI_CUI: + case XFS_LI_CUD: /* nothing to do in pass 1 */ return 0; default: @@ -3832,6 +3956,10 @@ xlog_recover_commit_pass2( return xlog_recover_rui_pass2(log, item, trans->r_lsn); case XFS_LI_RUD: return xlog_recover_rud_pass2(log, item); + case XFS_LI_CUI: + return xlog_recover_cui_pass2(log, item, trans->r_lsn); + case XFS_LI_CUD: + return xlog_recover_cud_pass2(log, item); case XFS_LI_DQUOT: return xlog_recover_dquot_pass2(log, buffer_list, item, trans->r_lsn); @@ -4419,12 +4547,53 @@ xlog_recover_cancel_rui( spin_lock(&ailp->xa_lock); } +/* Recover the CUI if necessary. */ +STATIC int +xlog_recover_process_cui( + struct xfs_mount *mp, + struct xfs_ail *ailp, + struct xfs_log_item *lip) +{ + struct xfs_cui_log_item *cuip; + int error; + + /* + * Skip CUIs that we've already processed. + */ + cuip = container_of(lip, struct xfs_cui_log_item, cui_item); + if (test_bit(XFS_CUI_RECOVERED, &cuip->cui_flags)) + return 0; + + spin_unlock(&ailp->xa_lock); + error = xfs_cui_recover(mp, cuip); + spin_lock(&ailp->xa_lock); + + return error; +} + +/* Release the CUI since we're cancelling everything. */ +STATIC void +xlog_recover_cancel_cui( + struct xfs_mount *mp, + struct xfs_ail *ailp, + struct xfs_log_item *lip) +{ + struct xfs_cui_log_item *cuip; + + cuip = container_of(lip, struct xfs_cui_log_item, cui_item); + + spin_unlock(&ailp->xa_lock); + xfs_cui_release(cuip); + spin_lock(&ailp->xa_lock); +} + /* Is this log item a deferred action intent? */ static inline bool xlog_item_is_intent(struct xfs_log_item *lip) { switch (lip->li_type) { case XFS_LI_EFI: case XFS_LI_RUI: + case XFS_LI_CUI: return true; default: return false; @@ -4488,6 +4657,9 @@ xlog_recover_process_intents( case XFS_LI_RUI: error = xlog_recover_process_rui(log->l_mp, ailp, lip); break; + case XFS_LI_CUI: + error = xlog_recover_process_cui(log->l_mp, ailp, lip); + break; } if (error) goto out; @@ -4535,6 +4707,9 @@ xlog_recover_cancel_intents( case XFS_LI_RUI: xlog_recover_cancel_rui(log->l_mp, ailp, lip); break; + case XFS_LI_CUI: + xlog_recover_cancel_cui(log->l_mp, ailp, lip); + break; } lip = xfs_trans_ail_cursor_next(ailp, &cur); diff --git a/fs/xfs/xfs_refcount_item.c b/fs/xfs/xfs_refcount_item.c index f9ad05529eba..599a8d2271f9 100644 --- a/fs/xfs/xfs_refcount_item.c +++ b/fs/xfs/xfs_refcount_item.c @@ -22,12 +22,15 @@ #include "xfs_format.h" #include "xfs_log_format.h" #include "xfs_trans_resv.h" +#include "xfs_bit.h" #include "xfs_mount.h" +#include "xfs_defer.h" #include "xfs_trans.h" #include "xfs_trans_priv.h" #include "xfs_buf_item.h" #include "xfs_refcount_item.h" #include "xfs_log.h" +#include "xfs_refcount.h" kmem_zone_t *xfs_cui_zone; @@ -381,3 +384,60 @@ xfs_cud_init( return cudp; } + +/* + * Process a refcount update intent item that was recovered from the log. + * We need to update the refcountbt. + */ +int +xfs_cui_recover( + struct xfs_mount *mp, + struct xfs_cui_log_item *cuip) +{ + int i; + int error = 0; + struct xfs_phys_extent *refc; + xfs_fsblock_t startblock_fsb; + bool op_ok; + + ASSERT(!test_bit(XFS_CUI_RECOVERED, &cuip->cui_flags)); + + /* + * First check the validity of the extents described by the + * CUI. If any are bad, then assume that all are bad and + * just toss the CUI. + */ + for (i = 0; i < cuip->cui_format.cui_nextents; i++) { + refc = &cuip->cui_format.cui_extents[i]; + startblock_fsb = XFS_BB_TO_FSB(mp, + XFS_FSB_TO_DADDR(mp, refc->pe_startblock)); + switch (refc->pe_flags & XFS_REFCOUNT_EXTENT_TYPE_MASK) { + case XFS_REFCOUNT_INCREASE: + case XFS_REFCOUNT_DECREASE: + case XFS_REFCOUNT_ALLOC_COW: + case XFS_REFCOUNT_FREE_COW: + op_ok = true; + break; + default: + op_ok = false; + break; + } + if (!op_ok || startblock_fsb == 0 || + refc->pe_len == 0 || + startblock_fsb >= mp->m_sb.sb_dblocks || + refc->pe_len >= mp->m_sb.sb_agblocks || + (refc->pe_flags & ~XFS_REFCOUNT_EXTENT_FLAGS)) { + /* + * This will pull the CUI from the AIL and + * free the memory associated with it. + */ + set_bit(XFS_CUI_RECOVERED, &cuip->cui_flags); + xfs_cui_release(cuip); + return -EIO; + } + } + + set_bit(XFS_CUI_RECOVERED, &cuip->cui_flags); + xfs_cui_release(cuip); + return error; +} diff --git a/fs/xfs/xfs_refcount_item.h b/fs/xfs/xfs_refcount_item.h index 34b6f7a8c149..5b74dddfa64b 100644 --- a/fs/xfs/xfs_refcount_item.h +++ b/fs/xfs/xfs_refcount_item.h @@ -96,5 +96,6 @@ struct xfs_cud_log_item *xfs_cud_init(struct xfs_mount *, struct xfs_cui_log_item *); void xfs_cui_item_free(struct xfs_cui_log_item *); void xfs_cui_release(struct xfs_cui_log_item *); +int xfs_cui_recover(struct xfs_mount *mp, struct xfs_cui_log_item *cuip); #endif /* __XFS_REFCOUNT_ITEM_H__ */ diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index c7b9853c7ae9..e306e83539db 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -2932,6 +2932,39 @@ DEFINE_AG_EXTENT_EVENT(xfs_refcount_find_shared); DEFINE_AG_EXTENT_EVENT(xfs_refcount_find_shared_result); DEFINE_AG_ERROR_EVENT(xfs_refcount_find_shared_error); +TRACE_EVENT(xfs_refcount_finish_one_leftover, + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, + int type, xfs_agblock_t agbno, xfs_extlen_t len, + xfs_agblock_t new_agbno, xfs_extlen_t new_len), + TP_ARGS(mp, agno, type, agbno, len, new_agbno, new_len), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_agnumber_t, agno) + __field(int, type) + __field(xfs_agblock_t, agbno) + __field(xfs_extlen_t, len) + __field(xfs_agblock_t, new_agbno) + __field(xfs_extlen_t, new_len) + ), + TP_fast_assign( + __entry->dev = mp->m_super->s_dev; + __entry->agno = agno; + __entry->type = type; + __entry->agbno = agbno; + __entry->len = len; + __entry->new_agbno = new_agbno; + __entry->new_len = new_len; + ), + TP_printk("dev %d:%d type %d agno %u agbno %u len %u new_agbno %u new_len %u", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->type, + __entry->agno, + __entry->agbno, + __entry->len, + __entry->new_agbno, + __entry->new_len) +); + #endif /* _TRACE_XFS_H */ #undef TRACE_INCLUDE_PATH diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h index e2bf86aad33d..fe69e2048978 100644 --- a/fs/xfs/xfs_trans.h +++ b/fs/xfs/xfs_trans.h @@ -36,6 +36,7 @@ struct xfs_busy_extent; struct xfs_rud_log_item; struct xfs_rui_log_item; struct xfs_btree_cur; +struct xfs_cui_log_item; typedef struct xfs_log_item { struct list_head li_ail; /* AIL pointers */ @@ -248,4 +249,14 @@ int xfs_trans_log_finish_rmap_update(struct xfs_trans *tp, xfs_fsblock_t startblock, xfs_filblks_t blockcount, xfs_exntst_t state, struct xfs_btree_cur **pcur); +/* refcount updates */ +enum xfs_refcount_intent_type; + +struct xfs_cud_log_item *xfs_trans_get_cud(struct xfs_trans *tp, + struct xfs_cui_log_item *cuip); +int xfs_trans_log_finish_refcount_update(struct xfs_trans *tp, + struct xfs_cud_log_item *cudp, + enum xfs_refcount_intent_type type, xfs_fsblock_t startblock, + xfs_extlen_t blockcount, struct xfs_btree_cur **pcur); + #endif /* __XFS_TRANS_H__ */ diff --git a/fs/xfs/xfs_trans_refcount.c b/fs/xfs/xfs_trans_refcount.c new file mode 100644 index 000000000000..b18d548c1aae --- /dev/null +++ b/fs/xfs/xfs_trans_refcount.c @@ -0,0 +1,80 @@ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_mount.h" +#include "xfs_defer.h" +#include "xfs_trans.h" +#include "xfs_trans_priv.h" +#include "xfs_refcount_item.h" +#include "xfs_alloc.h" +#include "xfs_refcount.h" + +/* + * This routine is called to allocate a "refcount update done" + * log item. + */ +struct xfs_cud_log_item * +xfs_trans_get_cud( + struct xfs_trans *tp, + struct xfs_cui_log_item *cuip) +{ + struct xfs_cud_log_item *cudp; + + cudp = xfs_cud_init(tp->t_mountp, cuip); + xfs_trans_add_item(tp, &cudp->cud_item); + return cudp; +} + +/* + * Finish an refcount update and log it to the CUD. Note that the + * transaction is marked dirty regardless of whether the refcount + * update succeeds or fails to support the CUI/CUD lifecycle rules. + */ +int +xfs_trans_log_finish_refcount_update( + struct xfs_trans *tp, + struct xfs_cud_log_item *cudp, + enum xfs_refcount_intent_type type, + xfs_fsblock_t startblock, + xfs_extlen_t blockcount, + struct xfs_btree_cur **pcur) +{ + int error; + + /* XXX: leave this empty for now */ + error = -EFSCORRUPTED; + + /* + * Mark the transaction dirty, even on error. This ensures the + * transaction is aborted, which: + * + * 1.) releases the CUI and frees the CUD + * 2.) shuts down the filesystem + */ + tp->t_flags |= XFS_TRANS_DIRTY; + cudp->cud_item.li_desc->lid_flags |= XFS_LID_DIRTY; + + return error; +} -- cgit v1.2.3-59-g8ed1b From 3172725814f9a689d6e8b3c7979b66403abf5dae Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:21 -0700 Subject: xfs: adjust refcount of an extent of blocks in refcount btree Provide functions to adjust the reference counts for an extent of physical blocks stored in the refcount btree. Signed-off-by: Darrick J. Wong Signed-off-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_refcount.c | 814 +++++++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_error.h | 4 +- 2 files changed, 817 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c index de1340652933..f522fe130a16 100644 --- a/fs/xfs/libxfs/xfs_refcount.c +++ b/fs/xfs/libxfs/xfs_refcount.c @@ -37,6 +37,12 @@ #include "xfs_bit.h" #include "xfs_refcount.h" +/* Allowable refcount adjustment amounts. */ +enum xfs_refc_adjust_op { + XFS_REFCOUNT_ADJUST_INCREASE = 1, + XFS_REFCOUNT_ADJUST_DECREASE = -1, +}; + /* * Look up the first record less than or equal to [bno, len] in the btree * given by cur. @@ -175,3 +181,811 @@ out_error: cur->bc_private.a.agno, error, _RET_IP_); return error; } + +/* + * Adjusting the Reference Count + * + * As stated elsewhere, the reference count btree (refcbt) stores + * >1 reference counts for extents of physical blocks. In this + * operation, we're either raising or lowering the reference count of + * some subrange stored in the tree: + * + * <------ adjustment range ------> + * ----+ +---+-----+ +--+--------+--------- + * 2 | | 3 | 4 | |17| 55 | 10 + * ----+ +---+-----+ +--+--------+--------- + * X axis is physical blocks number; + * reference counts are the numbers inside the rectangles + * + * The first thing we need to do is to ensure that there are no + * refcount extents crossing either boundary of the range to be + * adjusted. For any extent that does cross a boundary, split it into + * two extents so that we can increment the refcount of one of the + * pieces later: + * + * <------ adjustment range ------> + * ----+ +---+-----+ +--+--------+----+---- + * 2 | | 3 | 2 | |17| 55 | 10 | 10 + * ----+ +---+-----+ +--+--------+----+---- + * + * For this next step, let's assume that all the physical blocks in + * the adjustment range are mapped to a file and are therefore in use + * at least once. Therefore, we can infer that any gap in the + * refcount tree within the adjustment range represents a physical + * extent with refcount == 1: + * + * <------ adjustment range ------> + * ----+---+---+-----+-+--+--------+----+---- + * 2 |"1"| 3 | 2 |1|17| 55 | 10 | 10 + * ----+---+---+-----+-+--+--------+----+---- + * ^ + * + * For each extent that falls within the interval range, figure out + * which extent is to the left or the right of that extent. Now we + * have a left, current, and right extent. If the new reference count + * of the center extent enables us to merge left, center, and right + * into one record covering all three, do so. If the center extent is + * at the left end of the range, abuts the left extent, and its new + * reference count matches the left extent's record, then merge them. + * If the center extent is at the right end of the range, abuts the + * right extent, and the reference counts match, merge those. In the + * example, we can left merge (assuming an increment operation): + * + * <------ adjustment range ------> + * --------+---+-----+-+--+--------+----+---- + * 2 | 3 | 2 |1|17| 55 | 10 | 10 + * --------+---+-----+-+--+--------+----+---- + * ^ + * + * For all other extents within the range, adjust the reference count + * or delete it if the refcount falls below 2. If we were + * incrementing, the end result looks like this: + * + * <------ adjustment range ------> + * --------+---+-----+-+--+--------+----+---- + * 2 | 4 | 3 |2|18| 56 | 11 | 10 + * --------+---+-----+-+--+--------+----+---- + * + * The result of a decrement operation looks as such: + * + * <------ adjustment range ------> + * ----+ +---+ +--+--------+----+---- + * 2 | | 2 | |16| 54 | 9 | 10 + * ----+ +---+ +--+--------+----+---- + * DDDD 111111DD + * + * The blocks marked "D" are freed; the blocks marked "1" are only + * referenced once and therefore the record is removed from the + * refcount btree. + */ + +/* Next block after this extent. */ +static inline xfs_agblock_t +xfs_refc_next( + struct xfs_refcount_irec *rc) +{ + return rc->rc_startblock + rc->rc_blockcount; +} + +/* + * Split a refcount extent that crosses agbno. + */ +STATIC int +xfs_refcount_split_extent( + struct xfs_btree_cur *cur, + xfs_agblock_t agbno, + bool *shape_changed) +{ + struct xfs_refcount_irec rcext, tmp; + int found_rec; + int error; + + *shape_changed = false; + error = xfs_refcount_lookup_le(cur, agbno, &found_rec); + if (error) + goto out_error; + if (!found_rec) + return 0; + + error = xfs_refcount_get_rec(cur, &rcext, &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); + if (rcext.rc_startblock == agbno || xfs_refc_next(&rcext) <= agbno) + return 0; + + *shape_changed = true; + trace_xfs_refcount_split_extent(cur->bc_mp, cur->bc_private.a.agno, + &rcext, agbno); + + /* Establish the right extent. */ + tmp = rcext; + tmp.rc_startblock = agbno; + tmp.rc_blockcount -= (agbno - rcext.rc_startblock); + error = xfs_refcount_update(cur, &tmp); + if (error) + goto out_error; + + /* Insert the left extent. */ + tmp = rcext; + tmp.rc_blockcount = agbno - rcext.rc_startblock; + error = xfs_refcount_insert(cur, &tmp, &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); + return error; + +out_error: + trace_xfs_refcount_split_extent_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + +/* + * Merge the left, center, and right extents. + */ +STATIC int +xfs_refcount_merge_center_extents( + struct xfs_btree_cur *cur, + struct xfs_refcount_irec *left, + struct xfs_refcount_irec *center, + struct xfs_refcount_irec *right, + unsigned long long extlen, + xfs_agblock_t *agbno, + xfs_extlen_t *aglen) +{ + int error; + int found_rec; + + trace_xfs_refcount_merge_center_extents(cur->bc_mp, + cur->bc_private.a.agno, left, center, right); + + /* + * Make sure the center and right extents are not in the btree. + * If the center extent was synthesized, the first delete call + * removes the right extent and we skip the second deletion. + * If center and right were in the btree, then the first delete + * call removes the center and the second one removes the right + * extent. + */ + error = xfs_refcount_lookup_ge(cur, center->rc_startblock, + &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); + + error = xfs_refcount_delete(cur, &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); + + if (center->rc_refcount > 1) { + error = xfs_refcount_delete(cur, &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, + out_error); + } + + /* Enlarge the left extent. */ + error = xfs_refcount_lookup_le(cur, left->rc_startblock, + &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); + + left->rc_blockcount = extlen; + error = xfs_refcount_update(cur, left); + if (error) + goto out_error; + + *aglen = 0; + return error; + +out_error: + trace_xfs_refcount_merge_center_extents_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + +/* + * Merge with the left extent. + */ +STATIC int +xfs_refcount_merge_left_extent( + struct xfs_btree_cur *cur, + struct xfs_refcount_irec *left, + struct xfs_refcount_irec *cleft, + xfs_agblock_t *agbno, + xfs_extlen_t *aglen) +{ + int error; + int found_rec; + + trace_xfs_refcount_merge_left_extent(cur->bc_mp, + cur->bc_private.a.agno, left, cleft); + + /* If the extent at agbno (cleft) wasn't synthesized, remove it. */ + if (cleft->rc_refcount > 1) { + error = xfs_refcount_lookup_le(cur, cleft->rc_startblock, + &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, + out_error); + + error = xfs_refcount_delete(cur, &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, + out_error); + } + + /* Enlarge the left extent. */ + error = xfs_refcount_lookup_le(cur, left->rc_startblock, + &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); + + left->rc_blockcount += cleft->rc_blockcount; + error = xfs_refcount_update(cur, left); + if (error) + goto out_error; + + *agbno += cleft->rc_blockcount; + *aglen -= cleft->rc_blockcount; + return error; + +out_error: + trace_xfs_refcount_merge_left_extent_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + +/* + * Merge with the right extent. + */ +STATIC int +xfs_refcount_merge_right_extent( + struct xfs_btree_cur *cur, + struct xfs_refcount_irec *right, + struct xfs_refcount_irec *cright, + xfs_agblock_t *agbno, + xfs_extlen_t *aglen) +{ + int error; + int found_rec; + + trace_xfs_refcount_merge_right_extent(cur->bc_mp, + cur->bc_private.a.agno, cright, right); + + /* + * If the extent ending at agbno+aglen (cright) wasn't synthesized, + * remove it. + */ + if (cright->rc_refcount > 1) { + error = xfs_refcount_lookup_le(cur, cright->rc_startblock, + &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, + out_error); + + error = xfs_refcount_delete(cur, &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, + out_error); + } + + /* Enlarge the right extent. */ + error = xfs_refcount_lookup_le(cur, right->rc_startblock, + &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); + + right->rc_startblock -= cright->rc_blockcount; + right->rc_blockcount += cright->rc_blockcount; + error = xfs_refcount_update(cur, right); + if (error) + goto out_error; + + *aglen -= cright->rc_blockcount; + return error; + +out_error: + trace_xfs_refcount_merge_right_extent_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + +/* + * Find the left extent and the one after it (cleft). This function assumes + * that we've already split any extent crossing agbno. + */ +STATIC int +xfs_refcount_find_left_extents( + struct xfs_btree_cur *cur, + struct xfs_refcount_irec *left, + struct xfs_refcount_irec *cleft, + xfs_agblock_t agbno, + xfs_extlen_t aglen) +{ + struct xfs_refcount_irec tmp; + int error; + int found_rec; + + left->rc_startblock = cleft->rc_startblock = NULLAGBLOCK; + error = xfs_refcount_lookup_le(cur, agbno - 1, &found_rec); + if (error) + goto out_error; + if (!found_rec) + return 0; + + error = xfs_refcount_get_rec(cur, &tmp, &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); + + if (xfs_refc_next(&tmp) != agbno) + return 0; + /* We have a left extent; retrieve (or invent) the next right one */ + *left = tmp; + + error = xfs_btree_increment(cur, 0, &found_rec); + if (error) + goto out_error; + if (found_rec) { + error = xfs_refcount_get_rec(cur, &tmp, &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, + out_error); + + /* if tmp starts at the end of our range, just use that */ + if (tmp.rc_startblock == agbno) + *cleft = tmp; + else { + /* + * There's a gap in the refcntbt at the start of the + * range we're interested in (refcount == 1) so + * synthesize the implied extent and pass it back. + * We assume here that the agbno/aglen range was + * passed in from a data fork extent mapping and + * therefore is allocated to exactly one owner. + */ + cleft->rc_startblock = agbno; + cleft->rc_blockcount = min(aglen, + tmp.rc_startblock - agbno); + cleft->rc_refcount = 1; + } + } else { + /* + * No extents, so pretend that there's one covering the whole + * range. + */ + cleft->rc_startblock = agbno; + cleft->rc_blockcount = aglen; + cleft->rc_refcount = 1; + } + trace_xfs_refcount_find_left_extent(cur->bc_mp, cur->bc_private.a.agno, + left, cleft, agbno); + return error; + +out_error: + trace_xfs_refcount_find_left_extent_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + +/* + * Find the right extent and the one before it (cright). This function + * assumes that we've already split any extents crossing agbno + aglen. + */ +STATIC int +xfs_refcount_find_right_extents( + struct xfs_btree_cur *cur, + struct xfs_refcount_irec *right, + struct xfs_refcount_irec *cright, + xfs_agblock_t agbno, + xfs_extlen_t aglen) +{ + struct xfs_refcount_irec tmp; + int error; + int found_rec; + + right->rc_startblock = cright->rc_startblock = NULLAGBLOCK; + error = xfs_refcount_lookup_ge(cur, agbno + aglen, &found_rec); + if (error) + goto out_error; + if (!found_rec) + return 0; + + error = xfs_refcount_get_rec(cur, &tmp, &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error); + + if (tmp.rc_startblock != agbno + aglen) + return 0; + /* We have a right extent; retrieve (or invent) the next left one */ + *right = tmp; + + error = xfs_btree_decrement(cur, 0, &found_rec); + if (error) + goto out_error; + if (found_rec) { + error = xfs_refcount_get_rec(cur, &tmp, &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, + out_error); + + /* if tmp ends at the end of our range, just use that */ + if (xfs_refc_next(&tmp) == agbno + aglen) + *cright = tmp; + else { + /* + * There's a gap in the refcntbt at the end of the + * range we're interested in (refcount == 1) so + * create the implied extent and pass it back. + * We assume here that the agbno/aglen range was + * passed in from a data fork extent mapping and + * therefore is allocated to exactly one owner. + */ + cright->rc_startblock = max(agbno, xfs_refc_next(&tmp)); + cright->rc_blockcount = right->rc_startblock - + cright->rc_startblock; + cright->rc_refcount = 1; + } + } else { + /* + * No extents, so pretend that there's one covering the whole + * range. + */ + cright->rc_startblock = agbno; + cright->rc_blockcount = aglen; + cright->rc_refcount = 1; + } + trace_xfs_refcount_find_right_extent(cur->bc_mp, cur->bc_private.a.agno, + cright, right, agbno + aglen); + return error; + +out_error: + trace_xfs_refcount_find_right_extent_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + +/* Is this extent valid? */ +static inline bool +xfs_refc_valid( + struct xfs_refcount_irec *rc) +{ + return rc->rc_startblock != NULLAGBLOCK; +} + +/* + * Try to merge with any extents on the boundaries of the adjustment range. + */ +STATIC int +xfs_refcount_merge_extents( + struct xfs_btree_cur *cur, + xfs_agblock_t *agbno, + xfs_extlen_t *aglen, + enum xfs_refc_adjust_op adjust, + bool *shape_changed) +{ + struct xfs_refcount_irec left = {0}, cleft = {0}; + struct xfs_refcount_irec cright = {0}, right = {0}; + int error; + unsigned long long ulen; + bool cequal; + + *shape_changed = false; + /* + * Find the extent just below agbno [left], just above agbno [cleft], + * just below (agbno + aglen) [cright], and just above (agbno + aglen) + * [right]. + */ + error = xfs_refcount_find_left_extents(cur, &left, &cleft, *agbno, + *aglen); + if (error) + return error; + error = xfs_refcount_find_right_extents(cur, &right, &cright, *agbno, + *aglen); + if (error) + return error; + + /* No left or right extent to merge; exit. */ + if (!xfs_refc_valid(&left) && !xfs_refc_valid(&right)) + return 0; + + cequal = (cleft.rc_startblock == cright.rc_startblock) && + (cleft.rc_blockcount == cright.rc_blockcount); + + /* Try to merge left, cleft, and right. cleft must == cright. */ + ulen = (unsigned long long)left.rc_blockcount + cleft.rc_blockcount + + right.rc_blockcount; + if (xfs_refc_valid(&left) && xfs_refc_valid(&right) && + xfs_refc_valid(&cleft) && xfs_refc_valid(&cright) && cequal && + left.rc_refcount == cleft.rc_refcount + adjust && + right.rc_refcount == cleft.rc_refcount + adjust && + ulen < MAXREFCEXTLEN) { + *shape_changed = true; + return xfs_refcount_merge_center_extents(cur, &left, &cleft, + &right, ulen, agbno, aglen); + } + + /* Try to merge left and cleft. */ + ulen = (unsigned long long)left.rc_blockcount + cleft.rc_blockcount; + if (xfs_refc_valid(&left) && xfs_refc_valid(&cleft) && + left.rc_refcount == cleft.rc_refcount + adjust && + ulen < MAXREFCEXTLEN) { + *shape_changed = true; + error = xfs_refcount_merge_left_extent(cur, &left, &cleft, + agbno, aglen); + if (error) + return error; + + /* + * If we just merged left + cleft and cleft == cright, + * we no longer have a cright to merge with right. We're done. + */ + if (cequal) + return 0; + } + + /* Try to merge cright and right. */ + ulen = (unsigned long long)right.rc_blockcount + cright.rc_blockcount; + if (xfs_refc_valid(&right) && xfs_refc_valid(&cright) && + right.rc_refcount == cright.rc_refcount + adjust && + ulen < MAXREFCEXTLEN) { + *shape_changed = true; + return xfs_refcount_merge_right_extent(cur, &right, &cright, + agbno, aglen); + } + + return error; +} + +/* + * While we're adjusting the refcounts records of an extent, we have + * to keep an eye on the number of extents we're dirtying -- run too + * many in a single transaction and we'll exceed the transaction's + * reservation and crash the fs. Each record adds 12 bytes to the + * log (plus any key updates) so we'll conservatively assume 24 bytes + * per record. We must also leave space for btree splits on both ends + * of the range and space for the CUD and a new CUI. + * + * XXX: This is a pretty hand-wavy estimate. The penalty for guessing + * true incorrectly is a shutdown FS; the penalty for guessing false + * incorrectly is more transaction rolls than might be necessary. + * Be conservative here. + */ +static bool +xfs_refcount_still_have_space( + struct xfs_btree_cur *cur) +{ + unsigned long overhead; + + overhead = cur->bc_private.a.priv.refc.shape_changes * + xfs_allocfree_log_count(cur->bc_mp, 1); + overhead *= cur->bc_mp->m_sb.sb_blocksize; + + /* + * Only allow 2 refcount extent updates per transaction if the + * refcount continue update "error" has been injected. + */ + if (cur->bc_private.a.priv.refc.nr_ops > 2 && + XFS_TEST_ERROR(false, cur->bc_mp, + XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE, + XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE)) + return false; + + if (cur->bc_private.a.priv.refc.nr_ops == 0) + return true; + else if (overhead > cur->bc_tp->t_log_res) + return false; + return cur->bc_tp->t_log_res - overhead > + cur->bc_private.a.priv.refc.nr_ops * 32; +} + +/* + * Adjust the refcounts of middle extents. At this point we should have + * split extents that crossed the adjustment range; merged with adjacent + * extents; and updated agbno/aglen to reflect the merges. Therefore, + * all we have to do is update the extents inside [agbno, agbno + aglen]. + */ +STATIC int +xfs_refcount_adjust_extents( + struct xfs_btree_cur *cur, + xfs_agblock_t *agbno, + xfs_extlen_t *aglen, + enum xfs_refc_adjust_op adj, + struct xfs_defer_ops *dfops, + struct xfs_owner_info *oinfo) +{ + struct xfs_refcount_irec ext, tmp; + int error; + int found_rec, found_tmp; + xfs_fsblock_t fsbno; + + /* Merging did all the work already. */ + if (*aglen == 0) + return 0; + + error = xfs_refcount_lookup_ge(cur, *agbno, &found_rec); + if (error) + goto out_error; + + while (*aglen > 0 && xfs_refcount_still_have_space(cur)) { + error = xfs_refcount_get_rec(cur, &ext, &found_rec); + if (error) + goto out_error; + if (!found_rec) { + ext.rc_startblock = cur->bc_mp->m_sb.sb_agblocks; + ext.rc_blockcount = 0; + ext.rc_refcount = 0; + } + + /* + * Deal with a hole in the refcount tree; if a file maps to + * these blocks and there's no refcountbt record, pretend that + * there is one with refcount == 1. + */ + if (ext.rc_startblock != *agbno) { + tmp.rc_startblock = *agbno; + tmp.rc_blockcount = min(*aglen, + ext.rc_startblock - *agbno); + tmp.rc_refcount = 1 + adj; + trace_xfs_refcount_modify_extent(cur->bc_mp, + cur->bc_private.a.agno, &tmp); + + /* + * Either cover the hole (increment) or + * delete the range (decrement). + */ + if (tmp.rc_refcount) { + error = xfs_refcount_insert(cur, &tmp, + &found_tmp); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, + found_tmp == 1, out_error); + cur->bc_private.a.priv.refc.nr_ops++; + } else { + fsbno = XFS_AGB_TO_FSB(cur->bc_mp, + cur->bc_private.a.agno, + tmp.rc_startblock); + xfs_bmap_add_free(cur->bc_mp, dfops, fsbno, + tmp.rc_blockcount, oinfo); + } + + (*agbno) += tmp.rc_blockcount; + (*aglen) -= tmp.rc_blockcount; + + error = xfs_refcount_lookup_ge(cur, *agbno, + &found_rec); + if (error) + goto out_error; + } + + /* Stop if there's nothing left to modify */ + if (*aglen == 0 || !xfs_refcount_still_have_space(cur)) + break; + + /* + * Adjust the reference count and either update the tree + * (incr) or free the blocks (decr). + */ + if (ext.rc_refcount == MAXREFCOUNT) + goto skip; + ext.rc_refcount += adj; + trace_xfs_refcount_modify_extent(cur->bc_mp, + cur->bc_private.a.agno, &ext); + if (ext.rc_refcount > 1) { + error = xfs_refcount_update(cur, &ext); + if (error) + goto out_error; + cur->bc_private.a.priv.refc.nr_ops++; + } else if (ext.rc_refcount == 1) { + error = xfs_refcount_delete(cur, &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, + found_rec == 1, out_error); + cur->bc_private.a.priv.refc.nr_ops++; + goto advloop; + } else { + fsbno = XFS_AGB_TO_FSB(cur->bc_mp, + cur->bc_private.a.agno, + ext.rc_startblock); + xfs_bmap_add_free(cur->bc_mp, dfops, fsbno, + ext.rc_blockcount, oinfo); + } + +skip: + error = xfs_btree_increment(cur, 0, &found_rec); + if (error) + goto out_error; + +advloop: + (*agbno) += ext.rc_blockcount; + (*aglen) -= ext.rc_blockcount; + } + + return error; +out_error: + trace_xfs_refcount_modify_extent_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + +/* Adjust the reference count of a range of AG blocks. */ +STATIC int +xfs_refcount_adjust( + struct xfs_btree_cur *cur, + xfs_agblock_t agbno, + xfs_extlen_t aglen, + xfs_agblock_t *new_agbno, + xfs_extlen_t *new_aglen, + enum xfs_refc_adjust_op adj, + struct xfs_defer_ops *dfops, + struct xfs_owner_info *oinfo) +{ + bool shape_changed; + int shape_changes = 0; + int error; + + *new_agbno = agbno; + *new_aglen = aglen; + if (adj == XFS_REFCOUNT_ADJUST_INCREASE) + trace_xfs_refcount_increase(cur->bc_mp, cur->bc_private.a.agno, + agbno, aglen); + else + trace_xfs_refcount_decrease(cur->bc_mp, cur->bc_private.a.agno, + agbno, aglen); + + /* + * Ensure that no rcextents cross the boundary of the adjustment range. + */ + error = xfs_refcount_split_extent(cur, agbno, &shape_changed); + if (error) + goto out_error; + if (shape_changed) + shape_changes++; + + error = xfs_refcount_split_extent(cur, agbno + aglen, &shape_changed); + if (error) + goto out_error; + if (shape_changed) + shape_changes++; + + /* + * Try to merge with the left or right extents of the range. + */ + error = xfs_refcount_merge_extents(cur, new_agbno, new_aglen, adj, + &shape_changed); + if (error) + goto out_error; + if (shape_changed) + shape_changes++; + if (shape_changes) + cur->bc_private.a.priv.refc.shape_changes++; + + /* Now that we've taken care of the ends, adjust the middle extents */ + error = xfs_refcount_adjust_extents(cur, new_agbno, new_aglen, + adj, dfops, oinfo); + if (error) + goto out_error; + + return 0; + +out_error: + trace_xfs_refcount_adjust_error(cur->bc_mp, cur->bc_private.a.agno, + error, _RET_IP_); + return error; +} diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h index 3d224702fbc0..d9675c646572 100644 --- a/fs/xfs/xfs_error.h +++ b/fs/xfs/xfs_error.h @@ -92,7 +92,8 @@ extern void xfs_verifier_error(struct xfs_buf *bp); #define XFS_ERRTAG_BMAPIFORMAT 21 #define XFS_ERRTAG_FREE_EXTENT 22 #define XFS_ERRTAG_RMAP_FINISH_ONE 23 -#define XFS_ERRTAG_MAX 24 +#define XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE 24 +#define XFS_ERRTAG_MAX 25 /* * Random factors for above tags, 1 means always, 2 means 1/2 time, etc. @@ -121,6 +122,7 @@ extern void xfs_verifier_error(struct xfs_buf *bp); #define XFS_RANDOM_BMAPIFORMAT XFS_RANDOM_DEFAULT #define XFS_RANDOM_FREE_EXTENT 1 #define XFS_RANDOM_RMAP_FINISH_ONE 1 +#define XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE 1 #ifdef DEBUG extern int xfs_error_test_active; -- cgit v1.2.3-59-g8ed1b From 33ba6129208475ec3aeffe6e9dad9f9afe022405 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:22 -0700 Subject: xfs: connect refcount adjust functions to upper layers Plumb in the upper level interface to schedule and finish deferred refcount operations via the deferred ops mechanism. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_defer.h | 1 + fs/xfs/libxfs/xfs_refcount.c | 174 +++++++++++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_refcount.h | 13 +++ fs/xfs/xfs_error.h | 4 +- fs/xfs/xfs_refcount_item.c | 86 +++++++++++++++++++- fs/xfs/xfs_super.c | 1 + fs/xfs/xfs_trace.h | 3 + fs/xfs/xfs_trans.h | 8 +- fs/xfs/xfs_trans_refcount.c | 188 ++++++++++++++++++++++++++++++++++++++++++- 9 files changed, 472 insertions(+), 6 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h index e96533d178cf..4d94a869e581 100644 --- a/fs/xfs/libxfs/xfs_defer.h +++ b/fs/xfs/libxfs/xfs_defer.h @@ -51,6 +51,7 @@ struct xfs_defer_pending { * find all the space it needs. */ enum xfs_defer_ops_type { + XFS_DEFER_OPS_TYPE_REFCOUNT, XFS_DEFER_OPS_TYPE_RMAP, XFS_DEFER_OPS_TYPE_FREE, XFS_DEFER_OPS_TYPE_MAX, diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c index f522fe130a16..4a31a7c2f2c4 100644 --- a/fs/xfs/libxfs/xfs_refcount.c +++ b/fs/xfs/libxfs/xfs_refcount.c @@ -989,3 +989,177 @@ out_error: error, _RET_IP_); return error; } + +/* Clean up after calling xfs_refcount_finish_one. */ +void +xfs_refcount_finish_one_cleanup( + struct xfs_trans *tp, + struct xfs_btree_cur *rcur, + int error) +{ + struct xfs_buf *agbp; + + if (rcur == NULL) + return; + agbp = rcur->bc_private.a.agbp; + xfs_btree_del_cursor(rcur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR); + if (error) + xfs_trans_brelse(tp, agbp); +} + +/* + * Process one of the deferred refcount operations. We pass back the + * btree cursor to maintain our lock on the btree between calls. + * This saves time and eliminates a buffer deadlock between the + * superblock and the AGF because we'll always grab them in the same + * order. + */ +int +xfs_refcount_finish_one( + struct xfs_trans *tp, + struct xfs_defer_ops *dfops, + enum xfs_refcount_intent_type type, + xfs_fsblock_t startblock, + xfs_extlen_t blockcount, + xfs_fsblock_t *new_fsb, + xfs_extlen_t *new_len, + struct xfs_btree_cur **pcur) +{ + struct xfs_mount *mp = tp->t_mountp; + struct xfs_btree_cur *rcur; + struct xfs_buf *agbp = NULL; + int error = 0; + xfs_agnumber_t agno; + xfs_agblock_t bno; + xfs_agblock_t new_agbno; + unsigned long nr_ops = 0; + int shape_changes = 0; + + agno = XFS_FSB_TO_AGNO(mp, startblock); + ASSERT(agno != NULLAGNUMBER); + bno = XFS_FSB_TO_AGBNO(mp, startblock); + + trace_xfs_refcount_deferred(mp, XFS_FSB_TO_AGNO(mp, startblock), + type, XFS_FSB_TO_AGBNO(mp, startblock), + blockcount); + + if (XFS_TEST_ERROR(false, mp, + XFS_ERRTAG_REFCOUNT_FINISH_ONE, + XFS_RANDOM_REFCOUNT_FINISH_ONE)) + return -EIO; + + /* + * If we haven't gotten a cursor or the cursor AG doesn't match + * the startblock, get one now. + */ + rcur = *pcur; + if (rcur != NULL && rcur->bc_private.a.agno != agno) { + nr_ops = rcur->bc_private.a.priv.refc.nr_ops; + shape_changes = rcur->bc_private.a.priv.refc.shape_changes; + xfs_refcount_finish_one_cleanup(tp, rcur, 0); + rcur = NULL; + *pcur = NULL; + } + if (rcur == NULL) { + error = xfs_alloc_read_agf(tp->t_mountp, tp, agno, + XFS_ALLOC_FLAG_FREEING, &agbp); + if (error) + return error; + if (!agbp) + return -EFSCORRUPTED; + + rcur = xfs_refcountbt_init_cursor(mp, tp, agbp, agno, dfops); + if (!rcur) { + error = -ENOMEM; + goto out_cur; + } + rcur->bc_private.a.priv.refc.nr_ops = nr_ops; + rcur->bc_private.a.priv.refc.shape_changes = shape_changes; + } + *pcur = rcur; + + switch (type) { + case XFS_REFCOUNT_INCREASE: + error = xfs_refcount_adjust(rcur, bno, blockcount, &new_agbno, + new_len, XFS_REFCOUNT_ADJUST_INCREASE, dfops, NULL); + *new_fsb = XFS_AGB_TO_FSB(mp, agno, new_agbno); + break; + case XFS_REFCOUNT_DECREASE: + error = xfs_refcount_adjust(rcur, bno, blockcount, &new_agbno, + new_len, XFS_REFCOUNT_ADJUST_DECREASE, dfops, NULL); + *new_fsb = XFS_AGB_TO_FSB(mp, agno, new_agbno); + break; + default: + ASSERT(0); + error = -EFSCORRUPTED; + } + if (!error && *new_len > 0) + trace_xfs_refcount_finish_one_leftover(mp, agno, type, + bno, blockcount, new_agbno, *new_len); + return error; + +out_cur: + xfs_trans_brelse(tp, agbp); + + return error; +} + +/* + * Record a refcount intent for later processing. + */ +static int +__xfs_refcount_add( + struct xfs_mount *mp, + struct xfs_defer_ops *dfops, + enum xfs_refcount_intent_type type, + xfs_fsblock_t startblock, + xfs_extlen_t blockcount) +{ + struct xfs_refcount_intent *ri; + + trace_xfs_refcount_defer(mp, XFS_FSB_TO_AGNO(mp, startblock), + type, XFS_FSB_TO_AGBNO(mp, startblock), + blockcount); + + ri = kmem_alloc(sizeof(struct xfs_refcount_intent), + KM_SLEEP | KM_NOFS); + INIT_LIST_HEAD(&ri->ri_list); + ri->ri_type = type; + ri->ri_startblock = startblock; + ri->ri_blockcount = blockcount; + + xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_REFCOUNT, &ri->ri_list); + return 0; +} + +/* + * Increase the reference count of the blocks backing a file's extent. + */ +int +xfs_refcount_increase_extent( + struct xfs_mount *mp, + struct xfs_defer_ops *dfops, + struct xfs_bmbt_irec *PREV) +{ + if (!xfs_sb_version_hasreflink(&mp->m_sb)) + return 0; + + return __xfs_refcount_add(mp, dfops, XFS_REFCOUNT_INCREASE, + PREV->br_startblock, PREV->br_blockcount); +} + +/* + * Decrease the reference count of the blocks backing a file's extent. + */ +int +xfs_refcount_decrease_extent( + struct xfs_mount *mp, + struct xfs_defer_ops *dfops, + struct xfs_bmbt_irec *PREV) +{ + if (!xfs_sb_version_hasreflink(&mp->m_sb)) + return 0; + + return __xfs_refcount_add(mp, dfops, XFS_REFCOUNT_DECREASE, + PREV->br_startblock, PREV->br_blockcount); +} diff --git a/fs/xfs/libxfs/xfs_refcount.h b/fs/xfs/libxfs/xfs_refcount.h index 67b1c13fb714..0a1f290269df 100644 --- a/fs/xfs/libxfs/xfs_refcount.h +++ b/fs/xfs/libxfs/xfs_refcount.h @@ -41,4 +41,17 @@ struct xfs_refcount_intent { xfs_extlen_t ri_blockcount; }; +extern int xfs_refcount_increase_extent(struct xfs_mount *mp, + struct xfs_defer_ops *dfops, struct xfs_bmbt_irec *irec); +extern int xfs_refcount_decrease_extent(struct xfs_mount *mp, + struct xfs_defer_ops *dfops, struct xfs_bmbt_irec *irec); + +extern void xfs_refcount_finish_one_cleanup(struct xfs_trans *tp, + struct xfs_btree_cur *rcur, int error); +extern int xfs_refcount_finish_one(struct xfs_trans *tp, + struct xfs_defer_ops *dfops, enum xfs_refcount_intent_type type, + xfs_fsblock_t startblock, xfs_extlen_t blockcount, + xfs_fsblock_t *new_fsb, xfs_extlen_t *new_len, + struct xfs_btree_cur **pcur); + #endif /* __XFS_REFCOUNT_H__ */ diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h index d9675c646572..641e090f3bea 100644 --- a/fs/xfs/xfs_error.h +++ b/fs/xfs/xfs_error.h @@ -93,7 +93,8 @@ extern void xfs_verifier_error(struct xfs_buf *bp); #define XFS_ERRTAG_FREE_EXTENT 22 #define XFS_ERRTAG_RMAP_FINISH_ONE 23 #define XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE 24 -#define XFS_ERRTAG_MAX 25 +#define XFS_ERRTAG_REFCOUNT_FINISH_ONE 25 +#define XFS_ERRTAG_MAX 26 /* * Random factors for above tags, 1 means always, 2 means 1/2 time, etc. @@ -123,6 +124,7 @@ extern void xfs_verifier_error(struct xfs_buf *bp); #define XFS_RANDOM_FREE_EXTENT 1 #define XFS_RANDOM_RMAP_FINISH_ONE 1 #define XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE 1 +#define XFS_RANDOM_REFCOUNT_FINISH_ONE 1 #ifdef DEBUG extern int xfs_error_test_active; diff --git a/fs/xfs/xfs_refcount_item.c b/fs/xfs/xfs_refcount_item.c index 599a8d2271f9..82153e2a057c 100644 --- a/fs/xfs/xfs_refcount_item.c +++ b/fs/xfs/xfs_refcount_item.c @@ -396,9 +396,20 @@ xfs_cui_recover( { int i; int error = 0; + unsigned int refc_type; struct xfs_phys_extent *refc; xfs_fsblock_t startblock_fsb; bool op_ok; + struct xfs_cud_log_item *cudp; + struct xfs_trans *tp; + struct xfs_btree_cur *rcur = NULL; + enum xfs_refcount_intent_type type; + xfs_fsblock_t firstfsb; + xfs_fsblock_t new_fsb; + xfs_extlen_t new_len; + struct xfs_bmbt_irec irec; + struct xfs_defer_ops dfops; + bool requeue_only = false; ASSERT(!test_bit(XFS_CUI_RECOVERED, &cuip->cui_flags)); @@ -437,7 +448,80 @@ xfs_cui_recover( } } + /* + * Under normal operation, refcount updates are deferred, so we + * wouldn't be adding them directly to a transaction. All + * refcount updates manage reservation usage internally and + * dynamically by deferring work that won't fit in the + * transaction. Normally, any work that needs to be deferred + * gets attached to the same defer_ops that scheduled the + * refcount update. However, we're in log recovery here, so we + * we create our own defer_ops and use that to finish up any + * work that doesn't fit. + */ + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp); + if (error) + return error; + cudp = xfs_trans_get_cud(tp, cuip); + + xfs_defer_init(&dfops, &firstfsb); + for (i = 0; i < cuip->cui_format.cui_nextents; i++) { + refc = &cuip->cui_format.cui_extents[i]; + refc_type = refc->pe_flags & XFS_REFCOUNT_EXTENT_TYPE_MASK; + switch (refc_type) { + case XFS_REFCOUNT_INCREASE: + case XFS_REFCOUNT_DECREASE: + case XFS_REFCOUNT_ALLOC_COW: + case XFS_REFCOUNT_FREE_COW: + type = refc_type; + break; + default: + error = -EFSCORRUPTED; + goto abort_error; + } + if (requeue_only) { + new_fsb = refc->pe_startblock; + new_len = refc->pe_len; + } else + error = xfs_trans_log_finish_refcount_update(tp, cudp, + &dfops, type, refc->pe_startblock, refc->pe_len, + &new_fsb, &new_len, &rcur); + if (error) + goto abort_error; + + /* Requeue what we didn't finish. */ + if (new_len > 0) { + irec.br_startblock = new_fsb; + irec.br_blockcount = new_len; + switch (type) { + case XFS_REFCOUNT_INCREASE: + error = xfs_refcount_increase_extent( + tp->t_mountp, &dfops, &irec); + break; + case XFS_REFCOUNT_DECREASE: + error = xfs_refcount_decrease_extent( + tp->t_mountp, &dfops, &irec); + break; + default: + ASSERT(0); + } + if (error) + goto abort_error; + requeue_only = true; + } + } + + xfs_refcount_finish_one_cleanup(tp, rcur, error); + error = xfs_defer_finish(&tp, &dfops, NULL); + if (error) + goto abort_error; set_bit(XFS_CUI_RECOVERED, &cuip->cui_flags); - xfs_cui_release(cuip); + error = xfs_trans_commit(tp); + return error; + +abort_error: + xfs_refcount_finish_one_cleanup(tp, rcur, error); + xfs_defer_cancel(&dfops); + xfs_trans_cancel(tp); return error; } diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index abe69c656ed0..62346223d04f 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1903,6 +1903,7 @@ init_xfs_fs(void) xfs_extent_free_init_defer_op(); xfs_rmap_update_init_defer_op(); + xfs_refcount_update_init_defer_op(); xfs_dir_startup(); diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index e306e83539db..9c9acef13616 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -2931,6 +2931,9 @@ DEFINE_AG_ERROR_EVENT(xfs_refcount_find_right_extent_error); DEFINE_AG_EXTENT_EVENT(xfs_refcount_find_shared); DEFINE_AG_EXTENT_EVENT(xfs_refcount_find_shared_result); DEFINE_AG_ERROR_EVENT(xfs_refcount_find_shared_error); +#define DEFINE_REFCOUNT_DEFERRED_EVENT DEFINE_PHYS_EXTENT_DEFERRED_EVENT +DEFINE_REFCOUNT_DEFERRED_EVENT(xfs_refcount_defer); +DEFINE_REFCOUNT_DEFERRED_EVENT(xfs_refcount_deferred); TRACE_EVENT(xfs_refcount_finish_one_leftover, TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h index fe69e2048978..475636b13c48 100644 --- a/fs/xfs/xfs_trans.h +++ b/fs/xfs/xfs_trans.h @@ -37,6 +37,8 @@ struct xfs_rud_log_item; struct xfs_rui_log_item; struct xfs_btree_cur; struct xfs_cui_log_item; +struct xfs_cud_log_item; +struct xfs_defer_ops; typedef struct xfs_log_item { struct list_head li_ail; /* AIL pointers */ @@ -252,11 +254,13 @@ int xfs_trans_log_finish_rmap_update(struct xfs_trans *tp, /* refcount updates */ enum xfs_refcount_intent_type; +void xfs_refcount_update_init_defer_op(void); struct xfs_cud_log_item *xfs_trans_get_cud(struct xfs_trans *tp, struct xfs_cui_log_item *cuip); int xfs_trans_log_finish_refcount_update(struct xfs_trans *tp, - struct xfs_cud_log_item *cudp, + struct xfs_cud_log_item *cudp, struct xfs_defer_ops *dfops, enum xfs_refcount_intent_type type, xfs_fsblock_t startblock, - xfs_extlen_t blockcount, struct xfs_btree_cur **pcur); + xfs_extlen_t blockcount, xfs_fsblock_t *new_fsb, + xfs_extlen_t *new_len, struct xfs_btree_cur **pcur); #endif /* __XFS_TRANS_H__ */ diff --git a/fs/xfs/xfs_trans_refcount.c b/fs/xfs/xfs_trans_refcount.c index b18d548c1aae..94c1877af834 100644 --- a/fs/xfs/xfs_trans_refcount.c +++ b/fs/xfs/xfs_trans_refcount.c @@ -56,15 +56,18 @@ int xfs_trans_log_finish_refcount_update( struct xfs_trans *tp, struct xfs_cud_log_item *cudp, + struct xfs_defer_ops *dop, enum xfs_refcount_intent_type type, xfs_fsblock_t startblock, xfs_extlen_t blockcount, + xfs_fsblock_t *new_fsb, + xfs_extlen_t *new_len, struct xfs_btree_cur **pcur) { int error; - /* XXX: leave this empty for now */ - error = -EFSCORRUPTED; + error = xfs_refcount_finish_one(tp, dop, type, startblock, + blockcount, new_fsb, new_len, pcur); /* * Mark the transaction dirty, even on error. This ensures the @@ -78,3 +81,184 @@ xfs_trans_log_finish_refcount_update( return error; } + +/* Sort refcount intents by AG. */ +static int +xfs_refcount_update_diff_items( + void *priv, + struct list_head *a, + struct list_head *b) +{ + struct xfs_mount *mp = priv; + struct xfs_refcount_intent *ra; + struct xfs_refcount_intent *rb; + + ra = container_of(a, struct xfs_refcount_intent, ri_list); + rb = container_of(b, struct xfs_refcount_intent, ri_list); + return XFS_FSB_TO_AGNO(mp, ra->ri_startblock) - + XFS_FSB_TO_AGNO(mp, rb->ri_startblock); +} + +/* Get an CUI. */ +STATIC void * +xfs_refcount_update_create_intent( + struct xfs_trans *tp, + unsigned int count) +{ + struct xfs_cui_log_item *cuip; + + ASSERT(tp != NULL); + ASSERT(count > 0); + + cuip = xfs_cui_init(tp->t_mountp, count); + ASSERT(cuip != NULL); + + /* + * Get a log_item_desc to point at the new item. + */ + xfs_trans_add_item(tp, &cuip->cui_item); + return cuip; +} + +/* Set the phys extent flags for this reverse mapping. */ +static void +xfs_trans_set_refcount_flags( + struct xfs_phys_extent *refc, + enum xfs_refcount_intent_type type) +{ + refc->pe_flags = 0; + switch (type) { + case XFS_REFCOUNT_INCREASE: + case XFS_REFCOUNT_DECREASE: + case XFS_REFCOUNT_ALLOC_COW: + case XFS_REFCOUNT_FREE_COW: + refc->pe_flags |= type; + break; + default: + ASSERT(0); + } +} + +/* Log refcount updates in the intent item. */ +STATIC void +xfs_refcount_update_log_item( + struct xfs_trans *tp, + void *intent, + struct list_head *item) +{ + struct xfs_cui_log_item *cuip = intent; + struct xfs_refcount_intent *refc; + uint next_extent; + struct xfs_phys_extent *ext; + + refc = container_of(item, struct xfs_refcount_intent, ri_list); + + tp->t_flags |= XFS_TRANS_DIRTY; + cuip->cui_item.li_desc->lid_flags |= XFS_LID_DIRTY; + + /* + * atomic_inc_return gives us the value after the increment; + * we want to use it as an array index so we need to subtract 1 from + * it. + */ + next_extent = atomic_inc_return(&cuip->cui_next_extent) - 1; + ASSERT(next_extent < cuip->cui_format.cui_nextents); + ext = &cuip->cui_format.cui_extents[next_extent]; + ext->pe_startblock = refc->ri_startblock; + ext->pe_len = refc->ri_blockcount; + xfs_trans_set_refcount_flags(ext, refc->ri_type); +} + +/* Get an CUD so we can process all the deferred refcount updates. */ +STATIC void * +xfs_refcount_update_create_done( + struct xfs_trans *tp, + void *intent, + unsigned int count) +{ + return xfs_trans_get_cud(tp, intent); +} + +/* Process a deferred refcount update. */ +STATIC int +xfs_refcount_update_finish_item( + struct xfs_trans *tp, + struct xfs_defer_ops *dop, + struct list_head *item, + void *done_item, + void **state) +{ + struct xfs_refcount_intent *refc; + xfs_fsblock_t new_fsb; + xfs_extlen_t new_aglen; + int error; + + refc = container_of(item, struct xfs_refcount_intent, ri_list); + error = xfs_trans_log_finish_refcount_update(tp, done_item, dop, + refc->ri_type, + refc->ri_startblock, + refc->ri_blockcount, + &new_fsb, &new_aglen, + (struct xfs_btree_cur **)state); + /* Did we run out of reservation? Requeue what we didn't finish. */ + if (!error && new_aglen > 0) { + ASSERT(refc->ri_type == XFS_REFCOUNT_INCREASE || + refc->ri_type == XFS_REFCOUNT_DECREASE); + refc->ri_startblock = new_fsb; + refc->ri_blockcount = new_aglen; + return -EAGAIN; + } + kmem_free(refc); + return error; +} + +/* Clean up after processing deferred refcounts. */ +STATIC void +xfs_refcount_update_finish_cleanup( + struct xfs_trans *tp, + void *state, + int error) +{ + struct xfs_btree_cur *rcur = state; + + xfs_refcount_finish_one_cleanup(tp, rcur, error); +} + +/* Abort all pending CUIs. */ +STATIC void +xfs_refcount_update_abort_intent( + void *intent) +{ + xfs_cui_release(intent); +} + +/* Cancel a deferred refcount update. */ +STATIC void +xfs_refcount_update_cancel_item( + struct list_head *item) +{ + struct xfs_refcount_intent *refc; + + refc = container_of(item, struct xfs_refcount_intent, ri_list); + kmem_free(refc); +} + +static const struct xfs_defer_op_type xfs_refcount_update_defer_type = { + .type = XFS_DEFER_OPS_TYPE_REFCOUNT, + .max_items = XFS_CUI_MAX_FAST_EXTENTS, + .diff_items = xfs_refcount_update_diff_items, + .create_intent = xfs_refcount_update_create_intent, + .abort_intent = xfs_refcount_update_abort_intent, + .log_item = xfs_refcount_update_log_item, + .create_done = xfs_refcount_update_create_done, + .finish_item = xfs_refcount_update_finish_item, + .finish_cleanup = xfs_refcount_update_finish_cleanup, + .cancel_item = xfs_refcount_update_cancel_item, +}; + +/* Register the deferred op type. */ +void +xfs_refcount_update_init_defer_op(void) +{ + xfs_defer_init_op_type(&xfs_refcount_update_defer_type); +} -- cgit v1.2.3-59-g8ed1b From 62aab20f08758b1b171a73a54e0c72dd12beb980 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:23 -0700 Subject: xfs: adjust refcount when unmapping file blocks When we're unmapping blocks from a reflinked file, decrease the refcount of the affected blocks and free the extents that are no longer in use. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_bmap.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 9d7f61d36645..907d7b8df7bb 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -48,6 +48,7 @@ #include "xfs_filestream.h" #include "xfs_rmap.h" #include "xfs_ag_resv.h" +#include "xfs_refcount.h" kmem_zone_t *xfs_bmap_free_item_zone; @@ -4988,9 +4989,16 @@ xfs_bmap_del_extent( /* * If we need to, add to list of extents to delete. */ - if (do_fx) - xfs_bmap_add_free(mp, dfops, del->br_startblock, - del->br_blockcount, NULL); + if (do_fx) { + if (xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK) { + error = xfs_refcount_decrease_extent(mp, dfops, del); + if (error) + goto done; + } else + xfs_bmap_add_free(mp, dfops, del->br_startblock, + del->br_blockcount, NULL); + } + /* * Adjust inode # blocks in the file. */ -- cgit v1.2.3-59-g8ed1b From a90c00f05554e3a305cc2f4836e065368709926f Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:23 -0700 Subject: xfs: add refcount btree block detection to log recovery Identify refcountbt blocks in the log correctly so that we can validate them during log recovery. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_log_recover.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'fs') diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c index 7def6723b857..622881a52315 100644 --- a/fs/xfs/xfs_log_recover.c +++ b/fs/xfs/xfs_log_recover.c @@ -2245,6 +2245,7 @@ xlog_recover_get_buf_lsn( case XFS_ABTB_MAGIC: case XFS_ABTC_MAGIC: case XFS_RMAP_CRC_MAGIC: + case XFS_REFC_CRC_MAGIC: case XFS_IBT_CRC_MAGIC: case XFS_IBT_MAGIC: { struct xfs_btree_block *btb = blk; @@ -2418,6 +2419,9 @@ xlog_recover_validate_buf_type( case XFS_RMAP_CRC_MAGIC: bp->b_ops = &xfs_rmapbt_buf_ops; break; + case XFS_REFC_CRC_MAGIC: + bp->b_ops = &xfs_refcountbt_buf_ops; + break; default: warnmsg = "Bad btree block magic!"; break; -- cgit v1.2.3-59-g8ed1b From d0e853f3600cd2a3f7c4a067dc38155c77c51df9 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:24 -0700 Subject: xfs: reserve AG space for the refcount btree root Reduce the max AG usable space size so that we always have space for the refcount btree root. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_alloc.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c index be7e3fcefd73..effb64cf714f 100644 --- a/fs/xfs/libxfs/xfs_alloc.c +++ b/fs/xfs/libxfs/xfs_alloc.c @@ -128,6 +128,8 @@ xfs_alloc_ag_max_usable( blocks++; /* finobt root block */ if (xfs_sb_version_hasrmapbt(&mp->m_sb)) blocks++; /* rmap root block */ + if (xfs_sb_version_hasreflink(&mp->m_sb)) + blocks++; /* refcount root block */ return mp->m_sb.sb_agblocks - blocks; } -- cgit v1.2.3-59-g8ed1b From 350a27a6a65cc5dd2ba1b220e8641993414816d2 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:25 -0700 Subject: xfs: introduce reflink utility functions These functions will be used by the other reflink functions to find the maximum length of a range of shared blocks. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_refcount.c | 102 +++++++++++++++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_refcount.h | 4 ++ 2 files changed, 106 insertions(+) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c index 4a31a7c2f2c4..ab8c30d2a605 100644 --- a/fs/xfs/libxfs/xfs_refcount.c +++ b/fs/xfs/libxfs/xfs_refcount.c @@ -1163,3 +1163,105 @@ xfs_refcount_decrease_extent( return __xfs_refcount_add(mp, dfops, XFS_REFCOUNT_DECREASE, PREV->br_startblock, PREV->br_blockcount); } + +/* + * Given an AG extent, find the lowest-numbered run of shared blocks + * within that range and return the range in fbno/flen. If + * find_end_of_shared is set, return the longest contiguous extent of + * shared blocks; if not, just return the first extent we find. If no + * shared blocks are found, fbno and flen will be set to NULLAGBLOCK + * and 0, respectively. + */ +int +xfs_refcount_find_shared( + struct xfs_btree_cur *cur, + xfs_agblock_t agbno, + xfs_extlen_t aglen, + xfs_agblock_t *fbno, + xfs_extlen_t *flen, + bool find_end_of_shared) +{ + struct xfs_refcount_irec tmp; + int i; + int have; + int error; + + trace_xfs_refcount_find_shared(cur->bc_mp, cur->bc_private.a.agno, + agbno, aglen); + + /* By default, skip the whole range */ + *fbno = NULLAGBLOCK; + *flen = 0; + + /* Try to find a refcount extent that crosses the start */ + error = xfs_refcount_lookup_le(cur, agbno, &have); + if (error) + goto out_error; + if (!have) { + /* No left extent, look at the next one */ + error = xfs_btree_increment(cur, 0, &have); + if (error) + goto out_error; + if (!have) + goto done; + } + error = xfs_refcount_get_rec(cur, &tmp, &i); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, i == 1, out_error); + + /* If the extent ends before the start, look at the next one */ + if (tmp.rc_startblock + tmp.rc_blockcount <= agbno) { + error = xfs_btree_increment(cur, 0, &have); + if (error) + goto out_error; + if (!have) + goto done; + error = xfs_refcount_get_rec(cur, &tmp, &i); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, i == 1, out_error); + } + + /* If the extent starts after the range we want, bail out */ + if (tmp.rc_startblock >= agbno + aglen) + goto done; + + /* We found the start of a shared extent! */ + if (tmp.rc_startblock < agbno) { + tmp.rc_blockcount -= (agbno - tmp.rc_startblock); + tmp.rc_startblock = agbno; + } + + *fbno = tmp.rc_startblock; + *flen = min(tmp.rc_blockcount, agbno + aglen - *fbno); + if (!find_end_of_shared) + goto done; + + /* Otherwise, find the end of this shared extent */ + while (*fbno + *flen < agbno + aglen) { + error = xfs_btree_increment(cur, 0, &have); + if (error) + goto out_error; + if (!have) + break; + error = xfs_refcount_get_rec(cur, &tmp, &i); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, i == 1, out_error); + if (tmp.rc_startblock >= agbno + aglen || + tmp.rc_startblock != *fbno + *flen) + break; + *flen = min(*flen + tmp.rc_blockcount, agbno + aglen - *fbno); + } + +done: + trace_xfs_refcount_find_shared_result(cur->bc_mp, + cur->bc_private.a.agno, *fbno, *flen); + +out_error: + if (error) + trace_xfs_refcount_find_shared_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} diff --git a/fs/xfs/libxfs/xfs_refcount.h b/fs/xfs/libxfs/xfs_refcount.h index 0a1f290269df..adba3ae2b55f 100644 --- a/fs/xfs/libxfs/xfs_refcount.h +++ b/fs/xfs/libxfs/xfs_refcount.h @@ -54,4 +54,8 @@ extern int xfs_refcount_finish_one(struct xfs_trans *tp, xfs_fsblock_t *new_fsb, xfs_extlen_t *new_len, struct xfs_btree_cur **pcur); +extern int xfs_refcount_find_shared(struct xfs_btree_cur *cur, + xfs_agblock_t agbno, xfs_extlen_t aglen, xfs_agblock_t *fbno, + xfs_extlen_t *flen, bool find_end_of_shared); + #endif /* __XFS_REFCOUNT_H__ */ -- cgit v1.2.3-59-g8ed1b From 6413a01420c2fbf03b3d059795f541caeb962e86 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:25 -0700 Subject: xfs: create bmbt update intent log items Create bmbt update intent/done log items to record redo information in the log. Because we roll transactions multiple times for reflink operations, we also have to track the status of the metadata updates that will be recorded in the post-roll transactions in case we crash before committing the final transaction. This mechanism enables log recovery to finish what was already started. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/Makefile | 1 + fs/xfs/libxfs/xfs_log_format.h | 58 ++++++- fs/xfs/xfs_bmap_item.c | 374 +++++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_bmap_item.h | 97 +++++++++++ fs/xfs/xfs_super.c | 18 ++ 5 files changed, 546 insertions(+), 2 deletions(-) create mode 100644 fs/xfs/xfs_bmap_item.c create mode 100644 fs/xfs/xfs_bmap_item.h (limited to 'fs') diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile index 6a9ea9ed7efc..b85096138539 100644 --- a/fs/xfs/Makefile +++ b/fs/xfs/Makefile @@ -102,6 +102,7 @@ xfs-y += xfs_aops.o \ # low-level transaction/log code xfs-y += xfs_log.o \ xfs_log_cil.o \ + xfs_bmap_item.o \ xfs_buf_item.o \ xfs_extfree_item.o \ xfs_icreate_item.o \ diff --git a/fs/xfs/libxfs/xfs_log_format.h b/fs/xfs/libxfs/xfs_log_format.h index 3659f04016c0..5dd7c2e8f439 100644 --- a/fs/xfs/libxfs/xfs_log_format.h +++ b/fs/xfs/libxfs/xfs_log_format.h @@ -114,7 +114,9 @@ static inline uint xlog_get_cycle(char *ptr) #define XLOG_REG_TYPE_RUD_FORMAT 22 #define XLOG_REG_TYPE_CUI_FORMAT 23 #define XLOG_REG_TYPE_CUD_FORMAT 24 -#define XLOG_REG_TYPE_MAX 24 +#define XLOG_REG_TYPE_BUI_FORMAT 25 +#define XLOG_REG_TYPE_BUD_FORMAT 26 +#define XLOG_REG_TYPE_MAX 26 /* * Flags to log operation header @@ -235,6 +237,8 @@ typedef struct xfs_trans_header { #define XFS_LI_RUD 0x1241 #define XFS_LI_CUI 0x1242 /* refcount update intent */ #define XFS_LI_CUD 0x1243 +#define XFS_LI_BUI 0x1244 /* bmbt update intent */ +#define XFS_LI_BUD 0x1245 #define XFS_LI_TYPE_DESC \ { XFS_LI_EFI, "XFS_LI_EFI" }, \ @@ -248,7 +252,9 @@ typedef struct xfs_trans_header { { XFS_LI_RUI, "XFS_LI_RUI" }, \ { XFS_LI_RUD, "XFS_LI_RUD" }, \ { XFS_LI_CUI, "XFS_LI_CUI" }, \ - { XFS_LI_CUD, "XFS_LI_CUD" } + { XFS_LI_CUD, "XFS_LI_CUD" }, \ + { XFS_LI_BUI, "XFS_LI_BUI" }, \ + { XFS_LI_BUD, "XFS_LI_BUD" } /* * Inode Log Item Format definitions. @@ -724,6 +730,54 @@ struct xfs_cud_log_format { __uint64_t cud_cui_id; /* id of corresponding cui */ }; +/* + * BUI/BUD (inode block mapping) log format definitions + */ + +/* bmbt me_flags: upper bits are flags, lower byte is type code */ +/* Type codes are taken directly from enum xfs_bmap_intent_type. */ +#define XFS_BMAP_EXTENT_TYPE_MASK 0xFF + +#define XFS_BMAP_EXTENT_ATTR_FORK (1U << 31) +#define XFS_BMAP_EXTENT_UNWRITTEN (1U << 30) + +#define XFS_BMAP_EXTENT_FLAGS (XFS_BMAP_EXTENT_TYPE_MASK | \ + XFS_BMAP_EXTENT_ATTR_FORK | \ + XFS_BMAP_EXTENT_UNWRITTEN) + +/* + * This is the structure used to lay out an bui log item in the + * log. The bui_extents field is a variable size array whose + * size is given by bui_nextents. + */ +struct xfs_bui_log_format { + __uint16_t bui_type; /* bui log item type */ + __uint16_t bui_size; /* size of this item */ + __uint32_t bui_nextents; /* # extents to free */ + __uint64_t bui_id; /* bui identifier */ + struct xfs_map_extent bui_extents[]; /* array of extents to bmap */ +}; + +static inline size_t +xfs_bui_log_format_sizeof( + unsigned int nr) +{ + return sizeof(struct xfs_bui_log_format) + + nr * sizeof(struct xfs_map_extent); +} + +/* + * This is the structure used to lay out an bud log item in the + * log. The bud_extents array is a variable size array whose + * size is given by bud_nextents; + */ +struct xfs_bud_log_format { + __uint16_t bud_type; /* bud log item type */ + __uint16_t bud_size; /* size of this item */ + __uint32_t __pad; + __uint64_t bud_bui_id; /* id of corresponding bui */ +}; + /* * Dquot Log format definitions. * diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c new file mode 100644 index 000000000000..ea736af649de --- /dev/null +++ b/fs/xfs/xfs_bmap_item.c @@ -0,0 +1,374 @@ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_mount.h" +#include "xfs_trans.h" +#include "xfs_trans_priv.h" +#include "xfs_buf_item.h" +#include "xfs_bmap_item.h" +#include "xfs_log.h" + + +kmem_zone_t *xfs_bui_zone; +kmem_zone_t *xfs_bud_zone; + +static inline struct xfs_bui_log_item *BUI_ITEM(struct xfs_log_item *lip) +{ + return container_of(lip, struct xfs_bui_log_item, bui_item); +} + +void +xfs_bui_item_free( + struct xfs_bui_log_item *buip) +{ + kmem_zone_free(xfs_bui_zone, buip); +} + +STATIC void +xfs_bui_item_size( + struct xfs_log_item *lip, + int *nvecs, + int *nbytes) +{ + struct xfs_bui_log_item *buip = BUI_ITEM(lip); + + *nvecs += 1; + *nbytes += xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents); +} + +/* + * This is called to fill in the vector of log iovecs for the + * given bui log item. We use only 1 iovec, and we point that + * at the bui_log_format structure embedded in the bui item. + * It is at this point that we assert that all of the extent + * slots in the bui item have been filled. + */ +STATIC void +xfs_bui_item_format( + struct xfs_log_item *lip, + struct xfs_log_vec *lv) +{ + struct xfs_bui_log_item *buip = BUI_ITEM(lip); + struct xfs_log_iovec *vecp = NULL; + + ASSERT(atomic_read(&buip->bui_next_extent) == + buip->bui_format.bui_nextents); + + buip->bui_format.bui_type = XFS_LI_BUI; + buip->bui_format.bui_size = 1; + + xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUI_FORMAT, &buip->bui_format, + xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents)); +} + +/* + * Pinning has no meaning for an bui item, so just return. + */ +STATIC void +xfs_bui_item_pin( + struct xfs_log_item *lip) +{ +} + +/* + * The unpin operation is the last place an BUI is manipulated in the log. It is + * either inserted in the AIL or aborted in the event of a log I/O error. In + * either case, the BUI transaction has been successfully committed to make it + * this far. Therefore, we expect whoever committed the BUI to either construct + * and commit the BUD or drop the BUD's reference in the event of error. Simply + * drop the log's BUI reference now that the log is done with it. + */ +STATIC void +xfs_bui_item_unpin( + struct xfs_log_item *lip, + int remove) +{ + struct xfs_bui_log_item *buip = BUI_ITEM(lip); + + xfs_bui_release(buip); +} + +/* + * BUI items have no locking or pushing. However, since BUIs are pulled from + * the AIL when their corresponding BUDs are committed to disk, their situation + * is very similar to being pinned. Return XFS_ITEM_PINNED so that the caller + * will eventually flush the log. This should help in getting the BUI out of + * the AIL. + */ +STATIC uint +xfs_bui_item_push( + struct xfs_log_item *lip, + struct list_head *buffer_list) +{ + return XFS_ITEM_PINNED; +} + +/* + * The BUI has been either committed or aborted if the transaction has been + * cancelled. If the transaction was cancelled, an BUD isn't going to be + * constructed and thus we free the BUI here directly. + */ +STATIC void +xfs_bui_item_unlock( + struct xfs_log_item *lip) +{ + if (lip->li_flags & XFS_LI_ABORTED) + xfs_bui_item_free(BUI_ITEM(lip)); +} + +/* + * The BUI is logged only once and cannot be moved in the log, so simply return + * the lsn at which it's been logged. + */ +STATIC xfs_lsn_t +xfs_bui_item_committed( + struct xfs_log_item *lip, + xfs_lsn_t lsn) +{ + return lsn; +} + +/* + * The BUI dependency tracking op doesn't do squat. It can't because + * it doesn't know where the free extent is coming from. The dependency + * tracking has to be handled by the "enclosing" metadata object. For + * example, for inodes, the inode is locked throughout the extent freeing + * so the dependency should be recorded there. + */ +STATIC void +xfs_bui_item_committing( + struct xfs_log_item *lip, + xfs_lsn_t lsn) +{ +} + +/* + * This is the ops vector shared by all bui log items. + */ +static const struct xfs_item_ops xfs_bui_item_ops = { + .iop_size = xfs_bui_item_size, + .iop_format = xfs_bui_item_format, + .iop_pin = xfs_bui_item_pin, + .iop_unpin = xfs_bui_item_unpin, + .iop_unlock = xfs_bui_item_unlock, + .iop_committed = xfs_bui_item_committed, + .iop_push = xfs_bui_item_push, + .iop_committing = xfs_bui_item_committing, +}; + +/* + * Allocate and initialize an bui item with the given number of extents. + */ +struct xfs_bui_log_item * +xfs_bui_init( + struct xfs_mount *mp) + +{ + struct xfs_bui_log_item *buip; + + buip = kmem_zone_zalloc(xfs_bui_zone, KM_SLEEP); + + xfs_log_item_init(mp, &buip->bui_item, XFS_LI_BUI, &xfs_bui_item_ops); + buip->bui_format.bui_nextents = XFS_BUI_MAX_FAST_EXTENTS; + buip->bui_format.bui_id = (uintptr_t)(void *)buip; + atomic_set(&buip->bui_next_extent, 0); + atomic_set(&buip->bui_refcount, 2); + + return buip; +} + +/* + * Freeing the BUI requires that we remove it from the AIL if it has already + * been placed there. However, the BUI may not yet have been placed in the AIL + * when called by xfs_bui_release() from BUD processing due to the ordering of + * committed vs unpin operations in bulk insert operations. Hence the reference + * count to ensure only the last caller frees the BUI. + */ +void +xfs_bui_release( + struct xfs_bui_log_item *buip) +{ + if (atomic_dec_and_test(&buip->bui_refcount)) { + xfs_trans_ail_remove(&buip->bui_item, SHUTDOWN_LOG_IO_ERROR); + xfs_bui_item_free(buip); + } +} + +static inline struct xfs_bud_log_item *BUD_ITEM(struct xfs_log_item *lip) +{ + return container_of(lip, struct xfs_bud_log_item, bud_item); +} + +STATIC void +xfs_bud_item_size( + struct xfs_log_item *lip, + int *nvecs, + int *nbytes) +{ + *nvecs += 1; + *nbytes += sizeof(struct xfs_bud_log_format); +} + +/* + * This is called to fill in the vector of log iovecs for the + * given bud log item. We use only 1 iovec, and we point that + * at the bud_log_format structure embedded in the bud item. + * It is at this point that we assert that all of the extent + * slots in the bud item have been filled. + */ +STATIC void +xfs_bud_item_format( + struct xfs_log_item *lip, + struct xfs_log_vec *lv) +{ + struct xfs_bud_log_item *budp = BUD_ITEM(lip); + struct xfs_log_iovec *vecp = NULL; + + budp->bud_format.bud_type = XFS_LI_BUD; + budp->bud_format.bud_size = 1; + + xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUD_FORMAT, &budp->bud_format, + sizeof(struct xfs_bud_log_format)); +} + +/* + * Pinning has no meaning for an bud item, so just return. + */ +STATIC void +xfs_bud_item_pin( + struct xfs_log_item *lip) +{ +} + +/* + * Since pinning has no meaning for an bud item, unpinning does + * not either. + */ +STATIC void +xfs_bud_item_unpin( + struct xfs_log_item *lip, + int remove) +{ +} + +/* + * There isn't much you can do to push on an bud item. It is simply stuck + * waiting for the log to be flushed to disk. + */ +STATIC uint +xfs_bud_item_push( + struct xfs_log_item *lip, + struct list_head *buffer_list) +{ + return XFS_ITEM_PINNED; +} + +/* + * The BUD is either committed or aborted if the transaction is cancelled. If + * the transaction is cancelled, drop our reference to the BUI and free the + * BUD. + */ +STATIC void +xfs_bud_item_unlock( + struct xfs_log_item *lip) +{ + struct xfs_bud_log_item *budp = BUD_ITEM(lip); + + if (lip->li_flags & XFS_LI_ABORTED) { + xfs_bui_release(budp->bud_buip); + kmem_zone_free(xfs_bud_zone, budp); + } +} + +/* + * When the bud item is committed to disk, all we need to do is delete our + * reference to our partner bui item and then free ourselves. Since we're + * freeing ourselves we must return -1 to keep the transaction code from + * further referencing this item. + */ +STATIC xfs_lsn_t +xfs_bud_item_committed( + struct xfs_log_item *lip, + xfs_lsn_t lsn) +{ + struct xfs_bud_log_item *budp = BUD_ITEM(lip); + + /* + * Drop the BUI reference regardless of whether the BUD has been + * aborted. Once the BUD transaction is constructed, it is the sole + * responsibility of the BUD to release the BUI (even if the BUI is + * aborted due to log I/O error). + */ + xfs_bui_release(budp->bud_buip); + kmem_zone_free(xfs_bud_zone, budp); + + return (xfs_lsn_t)-1; +} + +/* + * The BUD dependency tracking op doesn't do squat. It can't because + * it doesn't know where the free extent is coming from. The dependency + * tracking has to be handled by the "enclosing" metadata object. For + * example, for inodes, the inode is locked throughout the extent freeing + * so the dependency should be recorded there. + */ +STATIC void +xfs_bud_item_committing( + struct xfs_log_item *lip, + xfs_lsn_t lsn) +{ +} + +/* + * This is the ops vector shared by all bud log items. + */ +static const struct xfs_item_ops xfs_bud_item_ops = { + .iop_size = xfs_bud_item_size, + .iop_format = xfs_bud_item_format, + .iop_pin = xfs_bud_item_pin, + .iop_unpin = xfs_bud_item_unpin, + .iop_unlock = xfs_bud_item_unlock, + .iop_committed = xfs_bud_item_committed, + .iop_push = xfs_bud_item_push, + .iop_committing = xfs_bud_item_committing, +}; + +/* + * Allocate and initialize an bud item with the given number of extents. + */ +struct xfs_bud_log_item * +xfs_bud_init( + struct xfs_mount *mp, + struct xfs_bui_log_item *buip) + +{ + struct xfs_bud_log_item *budp; + + budp = kmem_zone_zalloc(xfs_bud_zone, KM_SLEEP); + xfs_log_item_init(mp, &budp->bud_item, XFS_LI_BUD, &xfs_bud_item_ops); + budp->bud_buip = buip; + budp->bud_format.bud_bui_id = buip->bui_format.bui_id; + + return budp; +} diff --git a/fs/xfs/xfs_bmap_item.h b/fs/xfs/xfs_bmap_item.h new file mode 100644 index 000000000000..57c13d3a9b03 --- /dev/null +++ b/fs/xfs/xfs_bmap_item.h @@ -0,0 +1,97 @@ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#ifndef __XFS_BMAP_ITEM_H__ +#define __XFS_BMAP_ITEM_H__ + +/* + * There are (currently) two pairs of bmap btree redo item types: map & unmap. + * The common abbreviations for these are BUI (bmap update intent) and BUD + * (bmap update done). The redo item type is encoded in the flags field of + * each xfs_map_extent. + * + * *I items should be recorded in the *first* of a series of rolled + * transactions, and the *D items should be recorded in the same transaction + * that records the associated bmbt updates. + * + * Should the system crash after the commit of the first transaction but + * before the commit of the final transaction in a series, log recovery will + * use the redo information recorded by the intent items to replay the + * bmbt metadata updates in the non-first transaction. + */ + +/* kernel only BUI/BUD definitions */ + +struct xfs_mount; +struct kmem_zone; + +/* + * Max number of extents in fast allocation path. + */ +#define XFS_BUI_MAX_FAST_EXTENTS 1 + +/* + * Define BUI flag bits. Manipulated by set/clear/test_bit operators. + */ +#define XFS_BUI_RECOVERED 1 + +/* + * This is the "bmap update intent" log item. It is used to log the fact that + * some reverse mappings need to change. It is used in conjunction with the + * "bmap update done" log item described below. + * + * These log items follow the same rules as struct xfs_efi_log_item; see the + * comments about that structure (in xfs_extfree_item.h) for more details. + */ +struct xfs_bui_log_item { + struct xfs_log_item bui_item; + atomic_t bui_refcount; + atomic_t bui_next_extent; + unsigned long bui_flags; /* misc flags */ + struct xfs_bui_log_format bui_format; +}; + +static inline size_t +xfs_bui_log_item_sizeof( + unsigned int nr) +{ + return offsetof(struct xfs_bui_log_item, bui_format) + + xfs_bui_log_format_sizeof(nr); +} + +/* + * This is the "bmap update done" log item. It is used to log the fact that + * some bmbt updates mentioned in an earlier bui item have been performed. + */ +struct xfs_bud_log_item { + struct xfs_log_item bud_item; + struct xfs_bui_log_item *bud_buip; + struct xfs_bud_log_format bud_format; +}; + +extern struct kmem_zone *xfs_bui_zone; +extern struct kmem_zone *xfs_bud_zone; + +struct xfs_bui_log_item *xfs_bui_init(struct xfs_mount *); +struct xfs_bud_log_item *xfs_bud_init(struct xfs_mount *, + struct xfs_bui_log_item *); +void xfs_bui_item_free(struct xfs_bui_log_item *); +void xfs_bui_release(struct xfs_bui_log_item *); + +#endif /* __XFS_BMAP_ITEM_H__ */ diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 62346223d04f..071bae0ec499 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -48,6 +48,7 @@ #include "xfs_ondisk.h" #include "xfs_rmap_item.h" #include "xfs_refcount_item.h" +#include "xfs_bmap_item.h" #include #include @@ -1800,8 +1801,23 @@ xfs_init_zones(void) if (!xfs_cui_zone) goto out_destroy_cud_zone; + xfs_bud_zone = kmem_zone_init(sizeof(struct xfs_bud_log_item), + "xfs_bud_item"); + if (!xfs_bud_zone) + goto out_destroy_cui_zone; + + xfs_bui_zone = kmem_zone_init( + xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS), + "xfs_bui_item"); + if (!xfs_bui_zone) + goto out_destroy_bud_zone; + return 0; + out_destroy_bud_zone: + kmem_zone_destroy(xfs_bud_zone); + out_destroy_cui_zone: + kmem_zone_destroy(xfs_cui_zone); out_destroy_cud_zone: kmem_zone_destroy(xfs_cud_zone); out_destroy_rui_zone: @@ -1848,6 +1864,8 @@ xfs_destroy_zones(void) * destroy caches. */ rcu_barrier(); + kmem_zone_destroy(xfs_bui_zone); + kmem_zone_destroy(xfs_bud_zone); kmem_zone_destroy(xfs_cui_zone); kmem_zone_destroy(xfs_cud_zone); kmem_zone_destroy(xfs_rui_zone); -- cgit v1.2.3-59-g8ed1b From 77d61fe45e720577a2cc0e9580fbc57d8faa7232 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:26 -0700 Subject: xfs: log bmap intent items Provide a mechanism for higher levels to create BUI/BUD items, submit them to the log, and a stub function to deal with recovered BUI items. These parts will be connected to the rmapbt in a later patch. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/Makefile | 1 + fs/xfs/libxfs/xfs_bmap.h | 13 ++++ fs/xfs/xfs_bmap_item.c | 69 ++++++++++++++++++ fs/xfs/xfs_bmap_item.h | 1 + fs/xfs/xfs_log_recover.c | 177 +++++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_trans.h | 13 ++++ fs/xfs/xfs_trans_bmap.c | 84 ++++++++++++++++++++++ 7 files changed, 358 insertions(+) create mode 100644 fs/xfs/xfs_trans_bmap.c (limited to 'fs') diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile index b85096138539..6afb2281bc01 100644 --- a/fs/xfs/Makefile +++ b/fs/xfs/Makefile @@ -111,6 +111,7 @@ xfs-y += xfs_log.o \ xfs_rmap_item.o \ xfs_log_recover.o \ xfs_trans_ail.o \ + xfs_trans_bmap.o \ xfs_trans_buf.o \ xfs_trans_extfree.o \ xfs_trans_inode.o \ diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index 8395f6e8cf7d..7219207d58eb 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -207,4 +207,17 @@ int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, xfs_fileoff_t aoff, xfs_filblks_t len, struct xfs_bmbt_irec *got, struct xfs_bmbt_irec *prev, xfs_extnum_t *lastx, int eof); +enum xfs_bmap_intent_type { + XFS_BMAP_MAP = 1, + XFS_BMAP_UNMAP, +}; + +struct xfs_bmap_intent { + struct list_head bi_list; + enum xfs_bmap_intent_type bi_type; + struct xfs_inode *bi_owner; + int bi_whichfork; + struct xfs_bmbt_irec bi_bmap; +}; + #endif /* __XFS_BMAP_H__ */ diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c index ea736af649de..9b3a936fb384 100644 --- a/fs/xfs/xfs_bmap_item.c +++ b/fs/xfs/xfs_bmap_item.c @@ -22,12 +22,18 @@ #include "xfs_format.h" #include "xfs_log_format.h" #include "xfs_trans_resv.h" +#include "xfs_bit.h" #include "xfs_mount.h" +#include "xfs_defer.h" +#include "xfs_inode.h" #include "xfs_trans.h" #include "xfs_trans_priv.h" #include "xfs_buf_item.h" #include "xfs_bmap_item.h" #include "xfs_log.h" +#include "xfs_bmap.h" +#include "xfs_icache.h" +#include "xfs_trace.h" kmem_zone_t *xfs_bui_zone; @@ -372,3 +378,66 @@ xfs_bud_init( return budp; } + +/* + * Process a bmap update intent item that was recovered from the log. + * We need to update some inode's bmbt. + */ +int +xfs_bui_recover( + struct xfs_mount *mp, + struct xfs_bui_log_item *buip) +{ + int error = 0; + struct xfs_map_extent *bmap; + xfs_fsblock_t startblock_fsb; + xfs_fsblock_t inode_fsb; + bool op_ok; + + ASSERT(!test_bit(XFS_BUI_RECOVERED, &buip->bui_flags)); + + /* Only one mapping operation per BUI... */ + if (buip->bui_format.bui_nextents != XFS_BUI_MAX_FAST_EXTENTS) { + set_bit(XFS_BUI_RECOVERED, &buip->bui_flags); + xfs_bui_release(buip); + return -EIO; + } + + /* + * First check the validity of the extent described by the + * BUI. If anything is bad, then toss the BUI. + */ + bmap = &buip->bui_format.bui_extents[0]; + startblock_fsb = XFS_BB_TO_FSB(mp, + XFS_FSB_TO_DADDR(mp, bmap->me_startblock)); + inode_fsb = XFS_BB_TO_FSB(mp, XFS_FSB_TO_DADDR(mp, + XFS_INO_TO_FSB(mp, bmap->me_owner))); + switch (bmap->me_flags & XFS_BMAP_EXTENT_TYPE_MASK) { + case XFS_BMAP_MAP: + case XFS_BMAP_UNMAP: + op_ok = true; + break; + default: + op_ok = false; + break; + } + if (!op_ok || startblock_fsb == 0 || + bmap->me_len == 0 || + inode_fsb == 0 || + startblock_fsb >= mp->m_sb.sb_dblocks || + bmap->me_len >= mp->m_sb.sb_agblocks || + inode_fsb >= mp->m_sb.sb_dblocks || + (bmap->me_flags & ~XFS_BMAP_EXTENT_FLAGS)) { + /* + * This will pull the BUI from the AIL and + * free the memory associated with it. + */ + set_bit(XFS_BUI_RECOVERED, &buip->bui_flags); + xfs_bui_release(buip); + return -EIO; + } + + set_bit(XFS_BUI_RECOVERED, &buip->bui_flags); + xfs_bui_release(buip); + return error; +} diff --git a/fs/xfs/xfs_bmap_item.h b/fs/xfs/xfs_bmap_item.h index 57c13d3a9b03..c867daae4a3c 100644 --- a/fs/xfs/xfs_bmap_item.h +++ b/fs/xfs/xfs_bmap_item.h @@ -93,5 +93,6 @@ struct xfs_bud_log_item *xfs_bud_init(struct xfs_mount *, struct xfs_bui_log_item *); void xfs_bui_item_free(struct xfs_bui_log_item *); void xfs_bui_release(struct xfs_bui_log_item *); +int xfs_bui_recover(struct xfs_mount *mp, struct xfs_bui_log_item *buip); #endif /* __XFS_BMAP_ITEM_H__ */ diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c index 622881a52315..9697e946aa35 100644 --- a/fs/xfs/xfs_log_recover.c +++ b/fs/xfs/xfs_log_recover.c @@ -46,6 +46,7 @@ #include "xfs_rmap_item.h" #include "xfs_buf_item.h" #include "xfs_refcount_item.h" +#include "xfs_bmap_item.h" #define BLK_AVG(blk1, blk2) ((blk1+blk2) >> 1) @@ -1927,6 +1928,8 @@ xlog_recover_reorder_trans( case XFS_LI_RUD: case XFS_LI_CUI: case XFS_LI_CUD: + case XFS_LI_BUI: + case XFS_LI_BUD: trace_xfs_log_recover_item_reorder_tail(log, trans, item, pass); list_move_tail(&item->ri_list, &inode_list); @@ -3670,6 +3673,125 @@ xlog_recover_cud_pass2( return 0; } +/* + * Copy an BUI format buffer from the given buf, and into the destination + * BUI format structure. The BUI/BUD items were designed not to need any + * special alignment handling. + */ +static int +xfs_bui_copy_format( + struct xfs_log_iovec *buf, + struct xfs_bui_log_format *dst_bui_fmt) +{ + struct xfs_bui_log_format *src_bui_fmt; + uint len; + + src_bui_fmt = buf->i_addr; + len = xfs_bui_log_format_sizeof(src_bui_fmt->bui_nextents); + + if (buf->i_len == len) { + memcpy(dst_bui_fmt, src_bui_fmt, len); + return 0; + } + return -EFSCORRUPTED; +} + +/* + * This routine is called to create an in-core extent bmap update + * item from the bui format structure which was logged on disk. + * It allocates an in-core bui, copies the extents from the format + * structure into it, and adds the bui to the AIL with the given + * LSN. + */ +STATIC int +xlog_recover_bui_pass2( + struct xlog *log, + struct xlog_recover_item *item, + xfs_lsn_t lsn) +{ + int error; + struct xfs_mount *mp = log->l_mp; + struct xfs_bui_log_item *buip; + struct xfs_bui_log_format *bui_formatp; + + bui_formatp = item->ri_buf[0].i_addr; + + if (bui_formatp->bui_nextents != XFS_BUI_MAX_FAST_EXTENTS) + return -EFSCORRUPTED; + buip = xfs_bui_init(mp); + error = xfs_bui_copy_format(&item->ri_buf[0], &buip->bui_format); + if (error) { + xfs_bui_item_free(buip); + return error; + } + atomic_set(&buip->bui_next_extent, bui_formatp->bui_nextents); + + spin_lock(&log->l_ailp->xa_lock); + /* + * The RUI has two references. One for the RUD and one for RUI to ensure + * it makes it into the AIL. Insert the RUI into the AIL directly and + * drop the RUI reference. Note that xfs_trans_ail_update() drops the + * AIL lock. + */ + xfs_trans_ail_update(log->l_ailp, &buip->bui_item, lsn); + xfs_bui_release(buip); + return 0; +} + + +/* + * This routine is called when an BUD format structure is found in a committed + * transaction in the log. Its purpose is to cancel the corresponding BUI if it + * was still in the log. To do this it searches the AIL for the BUI with an id + * equal to that in the BUD format structure. If we find it we drop the BUD + * reference, which removes the BUI from the AIL and frees it. + */ +STATIC int +xlog_recover_bud_pass2( + struct xlog *log, + struct xlog_recover_item *item) +{ + struct xfs_bud_log_format *bud_formatp; + struct xfs_bui_log_item *buip = NULL; + struct xfs_log_item *lip; + __uint64_t bui_id; + struct xfs_ail_cursor cur; + struct xfs_ail *ailp = log->l_ailp; + + bud_formatp = item->ri_buf[0].i_addr; + if (item->ri_buf[0].i_len != sizeof(struct xfs_bud_log_format)) + return -EFSCORRUPTED; + bui_id = bud_formatp->bud_bui_id; + + /* + * Search for the BUI with the id in the BUD format structure in the + * AIL. + */ + spin_lock(&ailp->xa_lock); + lip = xfs_trans_ail_cursor_first(ailp, &cur, 0); + while (lip != NULL) { + if (lip->li_type == XFS_LI_BUI) { + buip = (struct xfs_bui_log_item *)lip; + if (buip->bui_format.bui_id == bui_id) { + /* + * Drop the BUD reference to the BUI. This + * removes the BUI from the AIL and frees it. + */ + spin_unlock(&ailp->xa_lock); + xfs_bui_release(buip); + spin_lock(&ailp->xa_lock); + break; + } + } + lip = xfs_trans_ail_cursor_next(ailp, &cur); + } + + xfs_trans_ail_cursor_done(&cur); + spin_unlock(&ailp->xa_lock); + + return 0; +} + /* * This routine is called when an inode create format structure is found in a * committed transaction in the log. It's purpose is to initialise the inodes @@ -3899,6 +4021,8 @@ xlog_recover_ra_pass2( case XFS_LI_RUD: case XFS_LI_CUI: case XFS_LI_CUD: + case XFS_LI_BUI: + case XFS_LI_BUD: default: break; } @@ -3926,6 +4050,8 @@ xlog_recover_commit_pass1( case XFS_LI_RUD: case XFS_LI_CUI: case XFS_LI_CUD: + case XFS_LI_BUI: + case XFS_LI_BUD: /* nothing to do in pass 1 */ return 0; default: @@ -3964,6 +4090,10 @@ xlog_recover_commit_pass2( return xlog_recover_cui_pass2(log, item, trans->r_lsn); case XFS_LI_CUD: return xlog_recover_cud_pass2(log, item); + case XFS_LI_BUI: + return xlog_recover_bui_pass2(log, item, trans->r_lsn); + case XFS_LI_BUD: + return xlog_recover_bud_pass2(log, item); case XFS_LI_DQUOT: return xlog_recover_dquot_pass2(log, buffer_list, item, trans->r_lsn); @@ -4591,6 +4721,46 @@ xlog_recover_cancel_cui( spin_lock(&ailp->xa_lock); } +/* Recover the BUI if necessary. */ +STATIC int +xlog_recover_process_bui( + struct xfs_mount *mp, + struct xfs_ail *ailp, + struct xfs_log_item *lip) +{ + struct xfs_bui_log_item *buip; + int error; + + /* + * Skip BUIs that we've already processed. + */ + buip = container_of(lip, struct xfs_bui_log_item, bui_item); + if (test_bit(XFS_BUI_RECOVERED, &buip->bui_flags)) + return 0; + + spin_unlock(&ailp->xa_lock); + error = xfs_bui_recover(mp, buip); + spin_lock(&ailp->xa_lock); + + return error; +} + +/* Release the BUI since we're cancelling everything. */ +STATIC void +xlog_recover_cancel_bui( + struct xfs_mount *mp, + struct xfs_ail *ailp, + struct xfs_log_item *lip) +{ + struct xfs_bui_log_item *buip; + + buip = container_of(lip, struct xfs_bui_log_item, bui_item); + + spin_unlock(&ailp->xa_lock); + xfs_bui_release(buip); + spin_lock(&ailp->xa_lock); +} + /* Is this log item a deferred action intent? */ static inline bool xlog_item_is_intent(struct xfs_log_item *lip) { @@ -4598,6 +4768,7 @@ static inline bool xlog_item_is_intent(struct xfs_log_item *lip) case XFS_LI_EFI: case XFS_LI_RUI: case XFS_LI_CUI: + case XFS_LI_BUI: return true; default: return false; @@ -4664,6 +4835,9 @@ xlog_recover_process_intents( case XFS_LI_CUI: error = xlog_recover_process_cui(log->l_mp, ailp, lip); break; + case XFS_LI_BUI: + error = xlog_recover_process_bui(log->l_mp, ailp, lip); + break; } if (error) goto out; @@ -4714,6 +4888,9 @@ xlog_recover_cancel_intents( case XFS_LI_CUI: xlog_recover_cancel_cui(log->l_mp, ailp, lip); break; + case XFS_LI_BUI: + xlog_recover_cancel_bui(log->l_mp, ailp, lip); + break; } lip = xfs_trans_ail_cursor_next(ailp, &cur); diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h index 475636b13c48..460ea79eef6a 100644 --- a/fs/xfs/xfs_trans.h +++ b/fs/xfs/xfs_trans.h @@ -39,6 +39,7 @@ struct xfs_btree_cur; struct xfs_cui_log_item; struct xfs_cud_log_item; struct xfs_defer_ops; +struct xfs_bui_log_item; typedef struct xfs_log_item { struct list_head li_ail; /* AIL pointers */ @@ -263,4 +264,16 @@ int xfs_trans_log_finish_refcount_update(struct xfs_trans *tp, xfs_extlen_t blockcount, xfs_fsblock_t *new_fsb, xfs_extlen_t *new_len, struct xfs_btree_cur **pcur); +/* mapping updates */ +enum xfs_bmap_intent_type; + +void xfs_bmap_update_init_defer_op(void); +struct xfs_bud_log_item *xfs_trans_get_bud(struct xfs_trans *tp, + struct xfs_bui_log_item *buip); +int xfs_trans_log_finish_bmap_update(struct xfs_trans *tp, + struct xfs_bud_log_item *rudp, struct xfs_defer_ops *dfops, + enum xfs_bmap_intent_type type, struct xfs_inode *ip, + int whichfork, xfs_fileoff_t startoff, xfs_fsblock_t startblock, + xfs_filblks_t blockcount, xfs_exntst_t state); + #endif /* __XFS_TRANS_H__ */ diff --git a/fs/xfs/xfs_trans_bmap.c b/fs/xfs/xfs_trans_bmap.c new file mode 100644 index 000000000000..656d6692d207 --- /dev/null +++ b/fs/xfs/xfs_trans_bmap.c @@ -0,0 +1,84 @@ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_mount.h" +#include "xfs_defer.h" +#include "xfs_trans.h" +#include "xfs_trans_priv.h" +#include "xfs_bmap_item.h" +#include "xfs_alloc.h" +#include "xfs_bmap.h" +#include "xfs_inode.h" + +/* + * This routine is called to allocate a "bmap update done" + * log item. + */ +struct xfs_bud_log_item * +xfs_trans_get_bud( + struct xfs_trans *tp, + struct xfs_bui_log_item *buip) +{ + struct xfs_bud_log_item *budp; + + budp = xfs_bud_init(tp->t_mountp, buip); + xfs_trans_add_item(tp, &budp->bud_item); + return budp; +} + +/* + * Finish an bmap update and log it to the BUD. Note that the + * transaction is marked dirty regardless of whether the bmap update + * succeeds or fails to support the BUI/BUD lifecycle rules. + */ +int +xfs_trans_log_finish_bmap_update( + struct xfs_trans *tp, + struct xfs_bud_log_item *budp, + struct xfs_defer_ops *dop, + enum xfs_bmap_intent_type type, + struct xfs_inode *ip, + int whichfork, + xfs_fileoff_t startoff, + xfs_fsblock_t startblock, + xfs_filblks_t blockcount, + xfs_exntst_t state) +{ + int error; + + error = -EFSCORRUPTED; + + /* + * Mark the transaction dirty, even on error. This ensures the + * transaction is aborted, which: + * + * 1.) releases the BUI and frees the BUD + * 2.) shuts down the filesystem + */ + tp->t_flags |= XFS_TRANS_DIRTY; + budp->bud_item.li_desc->lid_flags |= XFS_LID_DIRTY; + + return error; +} -- cgit v1.2.3-59-g8ed1b From f65306ea5246ef3ff68a6abf85f5a73a04903366 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:27 -0700 Subject: xfs: map an inode's offset to an exact physical block Teach the bmap routine to know how to map a range of file blocks to a specific range of physical blocks, instead of simply allocating fresh blocks. This enables reflink to map a file to blocks that are already in use. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_bmap.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_bmap.h | 10 ++++++- fs/xfs/xfs_trace.h | 54 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 131 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 907d7b8df7bb..1ec3087bbb97 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -3876,6 +3876,63 @@ xfs_bmap_btalloc( return 0; } +/* + * For a remap operation, just "allocate" an extent at the address that the + * caller passed in, and ensure that the AGFL is the right size. The caller + * will then map the "allocated" extent into the file somewhere. + */ +STATIC int +xfs_bmap_remap_alloc( + struct xfs_bmalloca *ap) +{ + struct xfs_trans *tp = ap->tp; + struct xfs_mount *mp = tp->t_mountp; + xfs_agblock_t bno; + struct xfs_alloc_arg args; + int error; + + /* + * validate that the block number is legal - the enables us to detect + * and handle a silent filesystem corruption rather than crashing. + */ + memset(&args, 0, sizeof(struct xfs_alloc_arg)); + args.tp = ap->tp; + args.mp = ap->tp->t_mountp; + bno = *ap->firstblock; + args.agno = XFS_FSB_TO_AGNO(mp, bno); + args.agbno = XFS_FSB_TO_AGBNO(mp, bno); + if (args.agno >= mp->m_sb.sb_agcount || + args.agbno >= mp->m_sb.sb_agblocks) + return -EFSCORRUPTED; + + /* "Allocate" the extent from the range we passed in. */ + trace_xfs_bmap_remap_alloc(ap->ip, *ap->firstblock, ap->length); + ap->blkno = bno; + ap->ip->i_d.di_nblocks += ap->length; + xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE); + + /* Fix the freelist, like a real allocator does. */ + args.datatype = ap->datatype; + args.pag = xfs_perag_get(args.mp, args.agno); + ASSERT(args.pag); + + /* + * The freelist fixing code will decline the allocation if + * the size and shape of the free space doesn't allow for + * allocating the extent and updating all the metadata that + * happens during an allocation. We're remapping, not + * allocating, so skip that check by pretending to be freeing. + */ + error = xfs_alloc_fix_freelist(&args, XFS_ALLOC_FLAG_FREEING); + if (error) + goto error0; +error0: + xfs_perag_put(args.pag); + if (error) + trace_xfs_bmap_remap_alloc_error(ap->ip, error, _RET_IP_); + return error; +} + /* * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file. * It figures out where to ask the underlying allocator to put the new extent. @@ -3884,6 +3941,8 @@ STATIC int xfs_bmap_alloc( struct xfs_bmalloca *ap) /* bmap alloc argument struct */ { + if (ap->flags & XFS_BMAPI_REMAP) + return xfs_bmap_remap_alloc(ap); if (XFS_IS_REALTIME_INODE(ap->ip) && xfs_alloc_is_userdata(ap->datatype)) return xfs_bmap_rtalloc(ap); @@ -4442,6 +4501,9 @@ xfs_bmapi_write( ASSERT(len > 0); ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL); ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); + ASSERT(!(flags & XFS_BMAPI_REMAP) || whichfork == XFS_DATA_FORK); + ASSERT(!(flags & XFS_BMAPI_PREALLOC) || !(flags & XFS_BMAPI_REMAP)); + ASSERT(!(flags & XFS_BMAPI_CONVERT) || !(flags & XFS_BMAPI_REMAP)); /* zeroing is for currently only for data extents, not metadata */ ASSERT((flags & (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO)) != @@ -4502,6 +4564,12 @@ xfs_bmapi_write( inhole = eof || bma.got.br_startoff > bno; wasdelay = !inhole && isnullstartblock(bma.got.br_startblock); + /* + * Make sure we only reflink into a hole. + */ + if (flags & XFS_BMAPI_REMAP) + ASSERT(inhole); + /* * First, deal with the hole before the allocated space * that we found, if any. diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index 7219207d58eb..8e69b5329629 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -97,6 +97,13 @@ struct xfs_extent_free_item */ #define XFS_BMAPI_ZERO 0x080 +/* + * Map the inode offset to the block given in ap->firstblock. Primarily + * used for reflink. The range must be in a hole, and this flag cannot be + * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork. + */ +#define XFS_BMAPI_REMAP 0x100 + #define XFS_BMAPI_FLAGS \ { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ { XFS_BMAPI_METADATA, "METADATA" }, \ @@ -105,7 +112,8 @@ struct xfs_extent_free_item { XFS_BMAPI_IGSTATE, "IGSTATE" }, \ { XFS_BMAPI_CONTIG, "CONTIG" }, \ { XFS_BMAPI_CONVERT, "CONVERT" }, \ - { XFS_BMAPI_ZERO, "ZERO" } + { XFS_BMAPI_ZERO, "ZERO" }, \ + { XFS_BMAPI_REMAP, "REMAP" } static inline int xfs_bmapi_aflag(int w) diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 9c9acef13616..e44992a84d7f 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -2968,6 +2968,60 @@ TRACE_EVENT(xfs_refcount_finish_one_leftover, __entry->new_len) ); +/* simple inode-based error/%ip tracepoint class */ +DECLARE_EVENT_CLASS(xfs_inode_error_class, + TP_PROTO(struct xfs_inode *ip, int error, unsigned long caller_ip), + TP_ARGS(ip, error, caller_ip), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_ino_t, ino) + __field(int, error) + __field(unsigned long, caller_ip) + ), + TP_fast_assign( + __entry->dev = VFS_I(ip)->i_sb->s_dev; + __entry->ino = ip->i_ino; + __entry->error = error; + __entry->caller_ip = caller_ip; + ), + TP_printk("dev %d:%d ino %llx error %d caller %ps", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->ino, + __entry->error, + (char *)__entry->caller_ip) +); + +#define DEFINE_INODE_ERROR_EVENT(name) \ +DEFINE_EVENT(xfs_inode_error_class, name, \ + TP_PROTO(struct xfs_inode *ip, int error, \ + unsigned long caller_ip), \ + TP_ARGS(ip, error, caller_ip)) + +/* reflink allocator */ +TRACE_EVENT(xfs_bmap_remap_alloc, + TP_PROTO(struct xfs_inode *ip, xfs_fsblock_t fsbno, + xfs_extlen_t len), + TP_ARGS(ip, fsbno, len), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_ino_t, ino) + __field(xfs_fsblock_t, fsbno) + __field(xfs_extlen_t, len) + ), + TP_fast_assign( + __entry->dev = VFS_I(ip)->i_sb->s_dev; + __entry->ino = ip->i_ino; + __entry->fsbno = fsbno; + __entry->len = len; + ), + TP_printk("dev %d:%d ino 0x%llx fsbno 0x%llx len %x", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->ino, + __entry->fsbno, + __entry->len) +); +DEFINE_INODE_ERROR_EVENT(xfs_bmap_remap_alloc_error); + #endif /* _TRACE_XFS_H */ #undef TRACE_INCLUDE_PATH -- cgit v1.2.3-59-g8ed1b From 4847acf868bb426455c8b703c80ed5fc5e2ee556 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:27 -0700 Subject: xfs: pass bmapi flags through to bmap_del_extent Pass BMAPI_ flags from bunmapi into bmap_del_extent and extend BMAPI_REMAP (which means "don't touch the allocator or the quota accounting") to apply to bunmapi as well. This will be used to implement the unmap operation, which will be used by swapext. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_bmap.c | 9 +++++---- fs/xfs/libxfs/xfs_bmap.h | 3 +++ 2 files changed, 8 insertions(+), 4 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 1ec3087bbb97..ee9f54bdf084 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -4765,7 +4765,8 @@ xfs_bmap_del_extent( xfs_btree_cur_t *cur, /* if null, not a btree */ xfs_bmbt_irec_t *del, /* data to remove from extents */ int *logflagsp, /* inode logging flags */ - int whichfork) /* data or attr fork */ + int whichfork, /* data or attr fork */ + int bflags) /* bmapi flags */ { xfs_filblks_t da_new; /* new delay-alloc indirect blocks */ xfs_filblks_t da_old; /* old delay-alloc indirect blocks */ @@ -5057,7 +5058,7 @@ xfs_bmap_del_extent( /* * If we need to, add to list of extents to delete. */ - if (do_fx) { + if (do_fx && !(bflags & XFS_BMAPI_REMAP)) { if (xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK) { error = xfs_refcount_decrease_extent(mp, dfops, del); if (error) @@ -5075,7 +5076,7 @@ xfs_bmap_del_extent( /* * Adjust quota data. */ - if (qfield) + if (qfield && !(bflags & XFS_BMAPI_REMAP)) xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks); /* @@ -5400,7 +5401,7 @@ xfs_bunmapi( cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL; error = xfs_bmap_del_extent(ip, tp, &lastx, dfops, cur, &del, - &tmp_logflags, whichfork); + &tmp_logflags, whichfork, flags); logflags |= tmp_logflags; if (error) goto error0; diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index 8e69b5329629..9c0406720d69 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -101,6 +101,9 @@ struct xfs_extent_free_item * Map the inode offset to the block given in ap->firstblock. Primarily * used for reflink. The range must be in a hole, and this flag cannot be * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork. + * + * For bunmapi, this flag unmaps the range without adjusting quota, reducing + * refcount, or freeing the blocks. */ #define XFS_BMAPI_REMAP 0x100 -- cgit v1.2.3-59-g8ed1b From 9f3afb57d5f1e7145986132106c6ca91f8136cc2 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:28 -0700 Subject: xfs: implement deferred bmbt map/unmap operations Implement deferred versions of the inode block map/unmap functions. These will be used in subsequent patches to make reflink operations atomic. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_bmap.c | 143 +++++++++++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_bmap.h | 9 +++ fs/xfs/libxfs/xfs_defer.h | 1 + fs/xfs/xfs_bmap_item.c | 65 +++++++++++++++++- fs/xfs/xfs_error.h | 4 +- fs/xfs/xfs_super.c | 1 + fs/xfs/xfs_trace.h | 5 ++ fs/xfs/xfs_trans.h | 1 + fs/xfs/xfs_trans_bmap.c | 167 +++++++++++++++++++++++++++++++++++++++++++++- 9 files changed, 393 insertions(+), 3 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index ee9f54bdf084..5828814c119c 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -6062,3 +6062,146 @@ out: xfs_trans_cancel(tp); return error; } + +/* Deferred mapping is only for real extents in the data fork. */ +static bool +xfs_bmap_is_update_needed( + struct xfs_bmbt_irec *bmap) +{ + return bmap->br_startblock != HOLESTARTBLOCK && + bmap->br_startblock != DELAYSTARTBLOCK; +} + +/* Record a bmap intent. */ +static int +__xfs_bmap_add( + struct xfs_mount *mp, + struct xfs_defer_ops *dfops, + enum xfs_bmap_intent_type type, + struct xfs_inode *ip, + int whichfork, + struct xfs_bmbt_irec *bmap) +{ + int error; + struct xfs_bmap_intent *bi; + + trace_xfs_bmap_defer(mp, + XFS_FSB_TO_AGNO(mp, bmap->br_startblock), + type, + XFS_FSB_TO_AGBNO(mp, bmap->br_startblock), + ip->i_ino, whichfork, + bmap->br_startoff, + bmap->br_blockcount, + bmap->br_state); + + bi = kmem_alloc(sizeof(struct xfs_bmap_intent), KM_SLEEP | KM_NOFS); + INIT_LIST_HEAD(&bi->bi_list); + bi->bi_type = type; + bi->bi_owner = ip; + bi->bi_whichfork = whichfork; + bi->bi_bmap = *bmap; + + error = xfs_defer_join(dfops, bi->bi_owner); + if (error) { + kmem_free(bi); + return error; + } + + xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_BMAP, &bi->bi_list); + return 0; +} + +/* Map an extent into a file. */ +int +xfs_bmap_map_extent( + struct xfs_mount *mp, + struct xfs_defer_ops *dfops, + struct xfs_inode *ip, + struct xfs_bmbt_irec *PREV) +{ + if (!xfs_bmap_is_update_needed(PREV)) + return 0; + + return __xfs_bmap_add(mp, dfops, XFS_BMAP_MAP, ip, + XFS_DATA_FORK, PREV); +} + +/* Unmap an extent out of a file. */ +int +xfs_bmap_unmap_extent( + struct xfs_mount *mp, + struct xfs_defer_ops *dfops, + struct xfs_inode *ip, + struct xfs_bmbt_irec *PREV) +{ + if (!xfs_bmap_is_update_needed(PREV)) + return 0; + + return __xfs_bmap_add(mp, dfops, XFS_BMAP_UNMAP, ip, + XFS_DATA_FORK, PREV); +} + +/* + * Process one of the deferred bmap operations. We pass back the + * btree cursor to maintain our lock on the bmapbt between calls. + */ +int +xfs_bmap_finish_one( + struct xfs_trans *tp, + struct xfs_defer_ops *dfops, + struct xfs_inode *ip, + enum xfs_bmap_intent_type type, + int whichfork, + xfs_fileoff_t startoff, + xfs_fsblock_t startblock, + xfs_filblks_t blockcount, + xfs_exntst_t state) +{ + struct xfs_bmbt_irec bmap; + int nimaps = 1; + xfs_fsblock_t firstfsb; + int flags = XFS_BMAPI_REMAP; + int done; + int error = 0; + + bmap.br_startblock = startblock; + bmap.br_startoff = startoff; + bmap.br_blockcount = blockcount; + bmap.br_state = state; + + trace_xfs_bmap_deferred(tp->t_mountp, + XFS_FSB_TO_AGNO(tp->t_mountp, startblock), type, + XFS_FSB_TO_AGBNO(tp->t_mountp, startblock), + ip->i_ino, whichfork, startoff, blockcount, state); + + if (whichfork != XFS_DATA_FORK && whichfork != XFS_ATTR_FORK) + return -EFSCORRUPTED; + if (whichfork == XFS_ATTR_FORK) + flags |= XFS_BMAPI_ATTRFORK; + + if (XFS_TEST_ERROR(false, tp->t_mountp, + XFS_ERRTAG_BMAP_FINISH_ONE, + XFS_RANDOM_BMAP_FINISH_ONE)) + return -EIO; + + switch (type) { + case XFS_BMAP_MAP: + firstfsb = bmap.br_startblock; + error = xfs_bmapi_write(tp, ip, bmap.br_startoff, + bmap.br_blockcount, flags, &firstfsb, + bmap.br_blockcount, &bmap, &nimaps, + dfops); + break; + case XFS_BMAP_UNMAP: + error = xfs_bunmapi(tp, ip, bmap.br_startoff, + bmap.br_blockcount, flags, 1, &firstfsb, + dfops, &done); + ASSERT(done); + break; + default: + ASSERT(0); + error = -EFSCORRUPTED; + } + + return error; +} diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index 9c0406720d69..b40ef797a4bf 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -231,4 +231,13 @@ struct xfs_bmap_intent { struct xfs_bmbt_irec bi_bmap; }; +int xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_defer_ops *dfops, + struct xfs_inode *ip, enum xfs_bmap_intent_type type, + int whichfork, xfs_fileoff_t startoff, xfs_fsblock_t startblock, + xfs_filblks_t blockcount, xfs_exntst_t state); +int xfs_bmap_map_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops, + struct xfs_inode *ip, struct xfs_bmbt_irec *imap); +int xfs_bmap_unmap_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops, + struct xfs_inode *ip, struct xfs_bmbt_irec *imap); + #endif /* __XFS_BMAP_H__ */ diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h index 4d94a869e581..f6e93ef0bffe 100644 --- a/fs/xfs/libxfs/xfs_defer.h +++ b/fs/xfs/libxfs/xfs_defer.h @@ -51,6 +51,7 @@ struct xfs_defer_pending { * find all the space it needs. */ enum xfs_defer_ops_type { + XFS_DEFER_OPS_TYPE_BMAP, XFS_DEFER_OPS_TYPE_REFCOUNT, XFS_DEFER_OPS_TYPE_RMAP, XFS_DEFER_OPS_TYPE_FREE, diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c index 9b3a936fb384..02e8f93f0315 100644 --- a/fs/xfs/xfs_bmap_item.c +++ b/fs/xfs/xfs_bmap_item.c @@ -389,10 +389,19 @@ xfs_bui_recover( struct xfs_bui_log_item *buip) { int error = 0; + unsigned int bui_type; struct xfs_map_extent *bmap; xfs_fsblock_t startblock_fsb; xfs_fsblock_t inode_fsb; bool op_ok; + struct xfs_bud_log_item *budp; + enum xfs_bmap_intent_type type; + int whichfork; + xfs_exntst_t state; + struct xfs_trans *tp; + struct xfs_inode *ip = NULL; + struct xfs_defer_ops dfops; + xfs_fsblock_t firstfsb; ASSERT(!test_bit(XFS_BUI_RECOVERED, &buip->bui_flags)); @@ -437,7 +446,61 @@ xfs_bui_recover( return -EIO; } + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp); + if (error) + return error; + budp = xfs_trans_get_bud(tp, buip); + + /* Grab the inode. */ + error = xfs_iget(mp, tp, bmap->me_owner, 0, XFS_ILOCK_EXCL, &ip); + if (error) + goto err_inode; + + xfs_defer_init(&dfops, &firstfsb); + + /* Process deferred bmap item. */ + state = (bmap->me_flags & XFS_BMAP_EXTENT_UNWRITTEN) ? + XFS_EXT_UNWRITTEN : XFS_EXT_NORM; + whichfork = (bmap->me_flags & XFS_BMAP_EXTENT_ATTR_FORK) ? + XFS_ATTR_FORK : XFS_DATA_FORK; + bui_type = bmap->me_flags & XFS_BMAP_EXTENT_TYPE_MASK; + switch (bui_type) { + case XFS_BMAP_MAP: + case XFS_BMAP_UNMAP: + type = bui_type; + break; + default: + error = -EFSCORRUPTED; + goto err_dfops; + } + xfs_trans_ijoin(tp, ip, 0); + + error = xfs_trans_log_finish_bmap_update(tp, budp, &dfops, type, + ip, whichfork, bmap->me_startoff, + bmap->me_startblock, bmap->me_len, + state); + if (error) + goto err_dfops; + + /* Finish transaction, free inodes. */ + error = xfs_defer_finish(&tp, &dfops, NULL); + if (error) + goto err_dfops; + set_bit(XFS_BUI_RECOVERED, &buip->bui_flags); - xfs_bui_release(buip); + error = xfs_trans_commit(tp); + xfs_iunlock(ip, XFS_ILOCK_EXCL); + IRELE(ip); + + return error; + +err_dfops: + xfs_defer_cancel(&dfops); +err_inode: + xfs_trans_cancel(tp); + if (ip) { + xfs_iunlock(ip, XFS_ILOCK_EXCL); + IRELE(ip); + } return error; } diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h index 641e090f3bea..8d8e1b07d295 100644 --- a/fs/xfs/xfs_error.h +++ b/fs/xfs/xfs_error.h @@ -94,7 +94,8 @@ extern void xfs_verifier_error(struct xfs_buf *bp); #define XFS_ERRTAG_RMAP_FINISH_ONE 23 #define XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE 24 #define XFS_ERRTAG_REFCOUNT_FINISH_ONE 25 -#define XFS_ERRTAG_MAX 26 +#define XFS_ERRTAG_BMAP_FINISH_ONE 26 +#define XFS_ERRTAG_MAX 27 /* * Random factors for above tags, 1 means always, 2 means 1/2 time, etc. @@ -125,6 +126,7 @@ extern void xfs_verifier_error(struct xfs_buf *bp); #define XFS_RANDOM_RMAP_FINISH_ONE 1 #define XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE 1 #define XFS_RANDOM_REFCOUNT_FINISH_ONE 1 +#define XFS_RANDOM_BMAP_FINISH_ONE 1 #ifdef DEBUG extern int xfs_error_test_active; diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 071bae0ec499..204b794cebd5 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1922,6 +1922,7 @@ init_xfs_fs(void) xfs_extent_free_init_defer_op(); xfs_rmap_update_init_defer_op(); xfs_refcount_update_init_defer_op(); + xfs_bmap_update_init_defer_op(); xfs_dir_startup(); diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index e44992a84d7f..85468ff279a1 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -2587,6 +2587,11 @@ DEFINE_RMAPBT_EVENT(xfs_rmap_lookup_le_range_result); DEFINE_RMAPBT_EVENT(xfs_rmap_find_right_neighbor_result); DEFINE_RMAPBT_EVENT(xfs_rmap_find_left_neighbor_result); +/* deferred bmbt updates */ +#define DEFINE_BMAP_DEFERRED_EVENT DEFINE_RMAP_DEFERRED_EVENT +DEFINE_BMAP_DEFERRED_EVENT(xfs_bmap_defer); +DEFINE_BMAP_DEFERRED_EVENT(xfs_bmap_deferred); + /* per-AG reservation */ DECLARE_EVENT_CLASS(xfs_ag_resv_class, TP_PROTO(struct xfs_perag *pag, enum xfs_ag_resv_type resv, diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h index 460ea79eef6a..61b7fbdd3ebd 100644 --- a/fs/xfs/xfs_trans.h +++ b/fs/xfs/xfs_trans.h @@ -40,6 +40,7 @@ struct xfs_cui_log_item; struct xfs_cud_log_item; struct xfs_defer_ops; struct xfs_bui_log_item; +struct xfs_bud_log_item; typedef struct xfs_log_item { struct list_head li_ail; /* AIL pointers */ diff --git a/fs/xfs/xfs_trans_bmap.c b/fs/xfs/xfs_trans_bmap.c index 656d6692d207..6408e7d7c08c 100644 --- a/fs/xfs/xfs_trans_bmap.c +++ b/fs/xfs/xfs_trans_bmap.c @@ -68,7 +68,8 @@ xfs_trans_log_finish_bmap_update( { int error; - error = -EFSCORRUPTED; + error = xfs_bmap_finish_one(tp, dop, ip, type, whichfork, startoff, + startblock, blockcount, state); /* * Mark the transaction dirty, even on error. This ensures the @@ -82,3 +83,167 @@ xfs_trans_log_finish_bmap_update( return error; } + +/* Sort bmap intents by inode. */ +static int +xfs_bmap_update_diff_items( + void *priv, + struct list_head *a, + struct list_head *b) +{ + struct xfs_bmap_intent *ba; + struct xfs_bmap_intent *bb; + + ba = container_of(a, struct xfs_bmap_intent, bi_list); + bb = container_of(b, struct xfs_bmap_intent, bi_list); + return ba->bi_owner->i_ino - bb->bi_owner->i_ino; +} + +/* Get an BUI. */ +STATIC void * +xfs_bmap_update_create_intent( + struct xfs_trans *tp, + unsigned int count) +{ + struct xfs_bui_log_item *buip; + + ASSERT(count == XFS_BUI_MAX_FAST_EXTENTS); + ASSERT(tp != NULL); + + buip = xfs_bui_init(tp->t_mountp); + ASSERT(buip != NULL); + + /* + * Get a log_item_desc to point at the new item. + */ + xfs_trans_add_item(tp, &buip->bui_item); + return buip; +} + +/* Set the map extent flags for this mapping. */ +static void +xfs_trans_set_bmap_flags( + struct xfs_map_extent *bmap, + enum xfs_bmap_intent_type type, + int whichfork, + xfs_exntst_t state) +{ + bmap->me_flags = 0; + switch (type) { + case XFS_BMAP_MAP: + case XFS_BMAP_UNMAP: + bmap->me_flags = type; + break; + default: + ASSERT(0); + } + if (state == XFS_EXT_UNWRITTEN) + bmap->me_flags |= XFS_BMAP_EXTENT_UNWRITTEN; + if (whichfork == XFS_ATTR_FORK) + bmap->me_flags |= XFS_BMAP_EXTENT_ATTR_FORK; +} + +/* Log bmap updates in the intent item. */ +STATIC void +xfs_bmap_update_log_item( + struct xfs_trans *tp, + void *intent, + struct list_head *item) +{ + struct xfs_bui_log_item *buip = intent; + struct xfs_bmap_intent *bmap; + uint next_extent; + struct xfs_map_extent *map; + + bmap = container_of(item, struct xfs_bmap_intent, bi_list); + + tp->t_flags |= XFS_TRANS_DIRTY; + buip->bui_item.li_desc->lid_flags |= XFS_LID_DIRTY; + + /* + * atomic_inc_return gives us the value after the increment; + * we want to use it as an array index so we need to subtract 1 from + * it. + */ + next_extent = atomic_inc_return(&buip->bui_next_extent) - 1; + ASSERT(next_extent < buip->bui_format.bui_nextents); + map = &buip->bui_format.bui_extents[next_extent]; + map->me_owner = bmap->bi_owner->i_ino; + map->me_startblock = bmap->bi_bmap.br_startblock; + map->me_startoff = bmap->bi_bmap.br_startoff; + map->me_len = bmap->bi_bmap.br_blockcount; + xfs_trans_set_bmap_flags(map, bmap->bi_type, bmap->bi_whichfork, + bmap->bi_bmap.br_state); +} + +/* Get an BUD so we can process all the deferred rmap updates. */ +STATIC void * +xfs_bmap_update_create_done( + struct xfs_trans *tp, + void *intent, + unsigned int count) +{ + return xfs_trans_get_bud(tp, intent); +} + +/* Process a deferred rmap update. */ +STATIC int +xfs_bmap_update_finish_item( + struct xfs_trans *tp, + struct xfs_defer_ops *dop, + struct list_head *item, + void *done_item, + void **state) +{ + struct xfs_bmap_intent *bmap; + int error; + + bmap = container_of(item, struct xfs_bmap_intent, bi_list); + error = xfs_trans_log_finish_bmap_update(tp, done_item, dop, + bmap->bi_type, + bmap->bi_owner, bmap->bi_whichfork, + bmap->bi_bmap.br_startoff, + bmap->bi_bmap.br_startblock, + bmap->bi_bmap.br_blockcount, + bmap->bi_bmap.br_state); + kmem_free(bmap); + return error; +} + +/* Abort all pending BUIs. */ +STATIC void +xfs_bmap_update_abort_intent( + void *intent) +{ + xfs_bui_release(intent); +} + +/* Cancel a deferred rmap update. */ +STATIC void +xfs_bmap_update_cancel_item( + struct list_head *item) +{ + struct xfs_bmap_intent *bmap; + + bmap = container_of(item, struct xfs_bmap_intent, bi_list); + kmem_free(bmap); +} + +static const struct xfs_defer_op_type xfs_bmap_update_defer_type = { + .type = XFS_DEFER_OPS_TYPE_BMAP, + .max_items = XFS_BUI_MAX_FAST_EXTENTS, + .diff_items = xfs_bmap_update_diff_items, + .create_intent = xfs_bmap_update_create_intent, + .abort_intent = xfs_bmap_update_abort_intent, + .log_item = xfs_bmap_update_log_item, + .create_done = xfs_bmap_update_create_done, + .finish_item = xfs_bmap_update_finish_item, + .cancel_item = xfs_bmap_update_cancel_item, +}; + +/* Register the deferred op type. */ +void +xfs_bmap_update_init_defer_op(void) +{ + xfs_defer_init_op_type(&xfs_bmap_update_defer_type); +} -- cgit v1.2.3-59-g8ed1b From 17c12bcd3030e4b3247d0c961ce598c731a9dcf9 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:29 -0700 Subject: xfs: when replaying bmap operations, don't let unlinked inodes get reaped Log recovery will iget an inode to replay BUI items and iput the inode when it's done. Unfortunately, if the inode was unlinked, the iput will see that i_nlink == 0 and decide to truncate & free the inode, which prevents us from replaying subsequent BUIs. We can't skip the BUIs because we have to replay all the redo items to ensure that atomic operations complete. Since unlinked inode recovery will reap the inode anyway, we can safely introduce a new inode flag to indicate that an inode is in this 'unlinked recovery' state and should not be auto-reaped in the drop_inode path. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_bmap_item.c | 2 ++ fs/xfs/xfs_inode.c | 1 + fs/xfs/xfs_inode.h | 6 ++++++ fs/xfs/xfs_log_recover.c | 1 + fs/xfs/xfs_mount.c | 9 +++++++++ fs/xfs/xfs_super.c | 10 ++++++++++ 6 files changed, 29 insertions(+) (limited to 'fs') diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c index 02e8f93f0315..9bf57c76623b 100644 --- a/fs/xfs/xfs_bmap_item.c +++ b/fs/xfs/xfs_bmap_item.c @@ -456,6 +456,8 @@ xfs_bui_recover( if (error) goto err_inode; + if (VFS_I(ip)->i_nlink == 0) + xfs_iflags_set(ip, XFS_IRECOVERY); xfs_defer_init(&dfops, &firstfsb); /* Process deferred bmap item. */ diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index e08eaea6327b..edb453d531e1 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -1850,6 +1850,7 @@ xfs_inactive( } mp = ip->i_mount; + ASSERT(!xfs_iflags_test(ip, XFS_IRECOVERY)); /* If this is a read-only mount, don't do this (would generate I/O) */ if (mp->m_flags & XFS_MOUNT_RDONLY) diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index a8658e68041a..4be32036e16a 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -222,6 +222,12 @@ static inline bool xfs_is_reflink_inode(struct xfs_inode *ip) #define XFS_IPINNED (1 << __XFS_IPINNED_BIT) #define XFS_IDONTCACHE (1 << 9) /* don't cache the inode long term */ #define XFS_IEOFBLOCKS (1 << 10)/* has the preallocblocks tag set */ +/* + * If this unlinked inode is in the middle of recovery, don't let drop_inode + * truncate and free the inode. This can happen if we iget the inode during + * log recovery to replay a bmap operation on the inode. + */ +#define XFS_IRECOVERY (1 << 11) /* * Per-lifetime flags need to be reset when re-using a reclaimable inode during diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c index 9697e946aa35..9b3d7c76915d 100644 --- a/fs/xfs/xfs_log_recover.c +++ b/fs/xfs/xfs_log_recover.c @@ -4969,6 +4969,7 @@ xlog_recover_process_one_iunlink( if (error) goto fail_iput; + xfs_iflags_clear(ip, XFS_IRECOVERY); ASSERT(VFS_I(ip)->i_nlink == 0); ASSERT(VFS_I(ip)->i_mode != 0); diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c index 3f64615f58db..a78a1164bab3 100644 --- a/fs/xfs/xfs_mount.c +++ b/fs/xfs/xfs_mount.c @@ -924,6 +924,15 @@ xfs_mountfs( } } + /* + * During the second phase of log recovery, we need iget and + * iput to behave like they do for an active filesystem. + * xfs_fs_drop_inode needs to be able to prevent the deletion + * of inodes before we're done replaying log items on those + * inodes. + */ + mp->m_super->s_flags |= MS_ACTIVE; + /* * Finish recovering the file system. This part needed to be delayed * until after the root and real-time bitmap inodes were consistently diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 204b794cebd5..35c04a790754 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1008,6 +1008,16 @@ xfs_fs_drop_inode( { struct xfs_inode *ip = XFS_I(inode); + /* + * If this unlinked inode is in the middle of recovery, don't + * drop the inode just yet; log recovery will take care of + * that. See the comment for this inode flag. + */ + if (ip->i_flags & XFS_IRECOVERY) { + ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED); + return 0; + } + return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE); } -- cgit v1.2.3-59-g8ed1b From 4453593be6c54e7581467e80f4a2757be098a3a2 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:29 -0700 Subject: xfs: return work remaining at the end of a bunmapi operation Return the range of file blocks that bunmapi didn't free. This hint is used by CoW and reflink to figure out what part of an extent actually got freed so that it can set up the appropriate atomic remapping of just the freed range. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_bmap.c | 36 ++++++++++++++++++++++++++++++------ fs/xfs/libxfs/xfs_bmap.h | 4 ++++ 2 files changed, 34 insertions(+), 6 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 5828814c119c..2be1fd3fac47 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -5098,17 +5098,16 @@ done: * *done is set. */ int /* error */ -xfs_bunmapi( +__xfs_bunmapi( xfs_trans_t *tp, /* transaction pointer */ struct xfs_inode *ip, /* incore inode */ xfs_fileoff_t bno, /* starting offset to unmap */ - xfs_filblks_t len, /* length to unmap in file */ + xfs_filblks_t *rlen, /* i/o: amount remaining */ int flags, /* misc flags */ xfs_extnum_t nexts, /* number of extents max */ xfs_fsblock_t *firstblock, /* first allocated block controls a.g. for allocs */ - struct xfs_defer_ops *dfops, /* i/o: list extents to free */ - int *done) /* set if not done yet */ + struct xfs_defer_ops *dfops) /* i/o: deferred updates */ { xfs_btree_cur_t *cur; /* bmap btree cursor */ xfs_bmbt_irec_t del; /* extent being deleted */ @@ -5130,6 +5129,7 @@ xfs_bunmapi( int wasdel; /* was a delayed alloc extent */ int whichfork; /* data or attribute fork */ xfs_fsblock_t sum; + xfs_filblks_t len = *rlen; /* length to unmap in file */ trace_xfs_bunmap(ip, bno, len, flags, _RET_IP_); @@ -5156,7 +5156,7 @@ xfs_bunmapi( return error; nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); if (nextents == 0) { - *done = 1; + *rlen = 0; return 0; } XFS_STATS_INC(mp, xs_blk_unmap); @@ -5427,7 +5427,10 @@ nodelete: extno++; } } - *done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0; + if (bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0) + *rlen = 0; + else + *rlen = bno - start + 1; /* * Convert to a btree if necessary. @@ -5483,6 +5486,27 @@ error0: return error; } +/* Unmap a range of a file. */ +int +xfs_bunmapi( + xfs_trans_t *tp, + struct xfs_inode *ip, + xfs_fileoff_t bno, + xfs_filblks_t len, + int flags, + xfs_extnum_t nexts, + xfs_fsblock_t *firstblock, + struct xfs_defer_ops *dfops, + int *done) +{ + int error; + + error = __xfs_bunmapi(tp, ip, bno, &len, flags, nexts, firstblock, + dfops); + *done = (len == 0); + return error; +} + /* * Determine whether an extent shift can be accomplished by a merge with the * extent that precedes the target hole of the shift. diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index b40ef797a4bf..85e3b9d91ade 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -197,6 +197,10 @@ int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip, xfs_fsblock_t *firstblock, xfs_extlen_t total, struct xfs_bmbt_irec *mval, int *nmap, struct xfs_defer_ops *dfops); +int __xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, + xfs_fileoff_t bno, xfs_filblks_t *rlen, int flags, + xfs_extnum_t nexts, xfs_fsblock_t *firstblock, + struct xfs_defer_ops *dfops); int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, xfs_fileoff_t bno, xfs_filblks_t len, int flags, xfs_extnum_t nexts, xfs_fsblock_t *firstblock, -- cgit v1.2.3-59-g8ed1b From 53aa1c34f4ebc0eed76a9c5fd56dc6fd0414d395 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:30 -0700 Subject: xfs: define tracepoints for reflink activities Define all the tracepoints we need to inspect the runtime operation of reflink/dedupe/copy-on-write. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_trace.h | 333 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 333 insertions(+) (limited to 'fs') diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 85468ff279a1..476bf2b54aeb 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -3027,6 +3027,339 @@ TRACE_EVENT(xfs_bmap_remap_alloc, ); DEFINE_INODE_ERROR_EVENT(xfs_bmap_remap_alloc_error); +/* reflink tracepoint classes */ + +/* two-file io tracepoint class */ +DECLARE_EVENT_CLASS(xfs_double_io_class, + TP_PROTO(struct xfs_inode *src, xfs_off_t soffset, xfs_off_t len, + struct xfs_inode *dest, xfs_off_t doffset), + TP_ARGS(src, soffset, len, dest, doffset), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_ino_t, src_ino) + __field(loff_t, src_isize) + __field(loff_t, src_disize) + __field(loff_t, src_offset) + __field(size_t, len) + __field(xfs_ino_t, dest_ino) + __field(loff_t, dest_isize) + __field(loff_t, dest_disize) + __field(loff_t, dest_offset) + ), + TP_fast_assign( + __entry->dev = VFS_I(src)->i_sb->s_dev; + __entry->src_ino = src->i_ino; + __entry->src_isize = VFS_I(src)->i_size; + __entry->src_disize = src->i_d.di_size; + __entry->src_offset = soffset; + __entry->len = len; + __entry->dest_ino = dest->i_ino; + __entry->dest_isize = VFS_I(dest)->i_size; + __entry->dest_disize = dest->i_d.di_size; + __entry->dest_offset = doffset; + ), + TP_printk("dev %d:%d count %zd " + "ino 0x%llx isize 0x%llx disize 0x%llx offset 0x%llx -> " + "ino 0x%llx isize 0x%llx disize 0x%llx offset 0x%llx", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->len, + __entry->src_ino, + __entry->src_isize, + __entry->src_disize, + __entry->src_offset, + __entry->dest_ino, + __entry->dest_isize, + __entry->dest_disize, + __entry->dest_offset) +) + +#define DEFINE_DOUBLE_IO_EVENT(name) \ +DEFINE_EVENT(xfs_double_io_class, name, \ + TP_PROTO(struct xfs_inode *src, xfs_off_t soffset, xfs_off_t len, \ + struct xfs_inode *dest, xfs_off_t doffset), \ + TP_ARGS(src, soffset, len, dest, doffset)) + +/* two-file vfs io tracepoint class */ +DECLARE_EVENT_CLASS(xfs_double_vfs_io_class, + TP_PROTO(struct inode *src, u64 soffset, u64 len, + struct inode *dest, u64 doffset), + TP_ARGS(src, soffset, len, dest, doffset), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(unsigned long, src_ino) + __field(loff_t, src_isize) + __field(loff_t, src_offset) + __field(size_t, len) + __field(unsigned long, dest_ino) + __field(loff_t, dest_isize) + __field(loff_t, dest_offset) + ), + TP_fast_assign( + __entry->dev = src->i_sb->s_dev; + __entry->src_ino = src->i_ino; + __entry->src_isize = i_size_read(src); + __entry->src_offset = soffset; + __entry->len = len; + __entry->dest_ino = dest->i_ino; + __entry->dest_isize = i_size_read(dest); + __entry->dest_offset = doffset; + ), + TP_printk("dev %d:%d count %zd " + "ino 0x%lx isize 0x%llx offset 0x%llx -> " + "ino 0x%lx isize 0x%llx offset 0x%llx", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->len, + __entry->src_ino, + __entry->src_isize, + __entry->src_offset, + __entry->dest_ino, + __entry->dest_isize, + __entry->dest_offset) +) + +#define DEFINE_DOUBLE_VFS_IO_EVENT(name) \ +DEFINE_EVENT(xfs_double_vfs_io_class, name, \ + TP_PROTO(struct inode *src, u64 soffset, u64 len, \ + struct inode *dest, u64 doffset), \ + TP_ARGS(src, soffset, len, dest, doffset)) + +/* CoW write tracepoint */ +DECLARE_EVENT_CLASS(xfs_copy_on_write_class, + TP_PROTO(struct xfs_inode *ip, xfs_fileoff_t lblk, xfs_fsblock_t pblk, + xfs_extlen_t len, xfs_fsblock_t new_pblk), + TP_ARGS(ip, lblk, pblk, len, new_pblk), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_ino_t, ino) + __field(xfs_fileoff_t, lblk) + __field(xfs_fsblock_t, pblk) + __field(xfs_extlen_t, len) + __field(xfs_fsblock_t, new_pblk) + ), + TP_fast_assign( + __entry->dev = VFS_I(ip)->i_sb->s_dev; + __entry->ino = ip->i_ino; + __entry->lblk = lblk; + __entry->pblk = pblk; + __entry->len = len; + __entry->new_pblk = new_pblk; + ), + TP_printk("dev %d:%d ino 0x%llx lblk 0x%llx pblk 0x%llx " + "len 0x%x new_pblk %llu", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->ino, + __entry->lblk, + __entry->pblk, + __entry->len, + __entry->new_pblk) +) + +#define DEFINE_COW_EVENT(name) \ +DEFINE_EVENT(xfs_copy_on_write_class, name, \ + TP_PROTO(struct xfs_inode *ip, xfs_fileoff_t lblk, xfs_fsblock_t pblk, \ + xfs_extlen_t len, xfs_fsblock_t new_pblk), \ + TP_ARGS(ip, lblk, pblk, len, new_pblk)) + +/* inode/irec events */ +DECLARE_EVENT_CLASS(xfs_inode_irec_class, + TP_PROTO(struct xfs_inode *ip, struct xfs_bmbt_irec *irec), + TP_ARGS(ip, irec), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_ino_t, ino) + __field(xfs_fileoff_t, lblk) + __field(xfs_extlen_t, len) + __field(xfs_fsblock_t, pblk) + ), + TP_fast_assign( + __entry->dev = VFS_I(ip)->i_sb->s_dev; + __entry->ino = ip->i_ino; + __entry->lblk = irec->br_startoff; + __entry->len = irec->br_blockcount; + __entry->pblk = irec->br_startblock; + ), + TP_printk("dev %d:%d ino 0x%llx lblk 0x%llx len 0x%x pblk %llu", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->ino, + __entry->lblk, + __entry->len, + __entry->pblk) +); +#define DEFINE_INODE_IREC_EVENT(name) \ +DEFINE_EVENT(xfs_inode_irec_class, name, \ + TP_PROTO(struct xfs_inode *ip, struct xfs_bmbt_irec *irec), \ + TP_ARGS(ip, irec)) + +/* refcount/reflink tracepoint definitions */ + +/* reflink tracepoints */ +DEFINE_INODE_EVENT(xfs_reflink_set_inode_flag); +DEFINE_INODE_EVENT(xfs_reflink_unset_inode_flag); +DEFINE_ITRUNC_EVENT(xfs_reflink_update_inode_size); +DEFINE_IOMAP_EVENT(xfs_reflink_remap_imap); +TRACE_EVENT(xfs_reflink_remap_blocks_loop, + TP_PROTO(struct xfs_inode *src, xfs_fileoff_t soffset, + xfs_filblks_t len, struct xfs_inode *dest, + xfs_fileoff_t doffset), + TP_ARGS(src, soffset, len, dest, doffset), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_ino_t, src_ino) + __field(xfs_fileoff_t, src_lblk) + __field(xfs_filblks_t, len) + __field(xfs_ino_t, dest_ino) + __field(xfs_fileoff_t, dest_lblk) + ), + TP_fast_assign( + __entry->dev = VFS_I(src)->i_sb->s_dev; + __entry->src_ino = src->i_ino; + __entry->src_lblk = soffset; + __entry->len = len; + __entry->dest_ino = dest->i_ino; + __entry->dest_lblk = doffset; + ), + TP_printk("dev %d:%d len 0x%llx " + "ino 0x%llx offset 0x%llx blocks -> " + "ino 0x%llx offset 0x%llx blocks", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->len, + __entry->src_ino, + __entry->src_lblk, + __entry->dest_ino, + __entry->dest_lblk) +); +TRACE_EVENT(xfs_reflink_punch_range, + TP_PROTO(struct xfs_inode *ip, xfs_fileoff_t lblk, + xfs_extlen_t len), + TP_ARGS(ip, lblk, len), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_ino_t, ino) + __field(xfs_fileoff_t, lblk) + __field(xfs_extlen_t, len) + ), + TP_fast_assign( + __entry->dev = VFS_I(ip)->i_sb->s_dev; + __entry->ino = ip->i_ino; + __entry->lblk = lblk; + __entry->len = len; + ), + TP_printk("dev %d:%d ino 0x%llx lblk 0x%llx len 0x%x", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->ino, + __entry->lblk, + __entry->len) +); +TRACE_EVENT(xfs_reflink_remap, + TP_PROTO(struct xfs_inode *ip, xfs_fileoff_t lblk, + xfs_extlen_t len, xfs_fsblock_t new_pblk), + TP_ARGS(ip, lblk, len, new_pblk), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_ino_t, ino) + __field(xfs_fileoff_t, lblk) + __field(xfs_extlen_t, len) + __field(xfs_fsblock_t, new_pblk) + ), + TP_fast_assign( + __entry->dev = VFS_I(ip)->i_sb->s_dev; + __entry->ino = ip->i_ino; + __entry->lblk = lblk; + __entry->len = len; + __entry->new_pblk = new_pblk; + ), + TP_printk("dev %d:%d ino 0x%llx lblk 0x%llx len 0x%x new_pblk %llu", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->ino, + __entry->lblk, + __entry->len, + __entry->new_pblk) +); +DEFINE_DOUBLE_IO_EVENT(xfs_reflink_remap_range); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_remap_range_error); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_set_inode_flag_error); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_update_inode_size_error); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_reflink_main_loop_error); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_read_iomap_error); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_remap_blocks_error); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_remap_extent_error); + +/* dedupe tracepoints */ +DEFINE_DOUBLE_IO_EVENT(xfs_reflink_compare_extents); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_compare_extents_error); + +/* ioctl tracepoints */ +DEFINE_DOUBLE_VFS_IO_EVENT(xfs_ioctl_reflink); +DEFINE_DOUBLE_VFS_IO_EVENT(xfs_ioctl_clone_range); +DEFINE_DOUBLE_VFS_IO_EVENT(xfs_ioctl_file_extent_same); +TRACE_EVENT(xfs_ioctl_clone, + TP_PROTO(struct inode *src, struct inode *dest), + TP_ARGS(src, dest), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(unsigned long, src_ino) + __field(loff_t, src_isize) + __field(unsigned long, dest_ino) + __field(loff_t, dest_isize) + ), + TP_fast_assign( + __entry->dev = src->i_sb->s_dev; + __entry->src_ino = src->i_ino; + __entry->src_isize = i_size_read(src); + __entry->dest_ino = dest->i_ino; + __entry->dest_isize = i_size_read(dest); + ), + TP_printk("dev %d:%d " + "ino 0x%lx isize 0x%llx -> " + "ino 0x%lx isize 0x%llx\n", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->src_ino, + __entry->src_isize, + __entry->dest_ino, + __entry->dest_isize) +); + +/* unshare tracepoints */ +DEFINE_SIMPLE_IO_EVENT(xfs_reflink_unshare); +DEFINE_SIMPLE_IO_EVENT(xfs_reflink_cow_eof_block); +DEFINE_PAGE_EVENT(xfs_reflink_unshare_page); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_unshare_error); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_cow_eof_block_error); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_dirty_page_error); + +/* copy on write */ +DEFINE_INODE_IREC_EVENT(xfs_reflink_trim_around_shared); + +DEFINE_RW_EVENT(xfs_reflink_reserve_cow_range); +DEFINE_INODE_IREC_EVENT(xfs_reflink_reserve_cow_extent); +DEFINE_RW_EVENT(xfs_reflink_allocate_cow_range); +DEFINE_INODE_IREC_EVENT(xfs_reflink_allocate_cow_extent); + +DEFINE_INODE_IREC_EVENT(xfs_reflink_bounce_dio_write); +DEFINE_IOMAP_EVENT(xfs_reflink_find_cow_mapping); +DEFINE_INODE_IREC_EVENT(xfs_reflink_trim_irec); +DEFINE_SIMPLE_IO_EVENT(xfs_iomap_cow_delay); + +DEFINE_SIMPLE_IO_EVENT(xfs_reflink_cancel_cow_range); +DEFINE_SIMPLE_IO_EVENT(xfs_reflink_end_cow); +DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_remap); +DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_remap_piece); + +DEFINE_INODE_ERROR_EVENT(xfs_reflink_reserve_cow_range_error); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_reserve_cow_extent_error); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_allocate_cow_range_error); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_cancel_cow_range_error); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_end_cow_error); + +DEFINE_COW_EVENT(xfs_reflink_fork_buf); +DEFINE_COW_EVENT(xfs_reflink_finish_fork_buf); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_fork_buf_error); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_finish_fork_buf_error); + +DEFINE_INODE_EVENT(xfs_reflink_cancel_pending_cow); +DEFINE_INODE_IREC_EVENT(xfs_reflink_cancel_cow); +DEFINE_INODE_ERROR_EVENT(xfs_reflink_cancel_pending_cow_error); + #endif /* _TRACE_XFS_H */ #undef TRACE_INCLUDE_PATH -- cgit v1.2.3-59-g8ed1b From f0ec1b8ef11df0a51954df7e3ff3ca4aadb0d34b Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:30 -0700 Subject: xfs: add reflink feature flag to geometry Report the reflink feature in the XFS geometry so that xfs_info and friends know the filesystem has this feature. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_fs.h | 3 ++- fs/xfs/xfs_fsops.c | 4 +++- 2 files changed, 5 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h index 79455058b752..6f4f2c3d7774 100644 --- a/fs/xfs/libxfs/xfs_fs.h +++ b/fs/xfs/libxfs/xfs_fs.h @@ -206,7 +206,8 @@ typedef struct xfs_fsop_resblks { #define XFS_FSOP_GEOM_FLAGS_FTYPE 0x10000 /* inode directory types */ #define XFS_FSOP_GEOM_FLAGS_FINOBT 0x20000 /* free inode btree */ #define XFS_FSOP_GEOM_FLAGS_SPINODES 0x40000 /* sparse inode chunks */ -#define XFS_FSOP_GEOM_FLAGS_RMAPBT 0x80000 /* Reverse mapping btree */ +#define XFS_FSOP_GEOM_FLAGS_RMAPBT 0x80000 /* reverse mapping btree */ +#define XFS_FSOP_GEOM_FLAGS_REFLINK 0x100000 /* files can share blocks */ /* * Minimum and maximum sizes need for growth checks. diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c index 4b4059b5e501..3acbf4e03187 100644 --- a/fs/xfs/xfs_fsops.c +++ b/fs/xfs/xfs_fsops.c @@ -108,7 +108,9 @@ xfs_fs_geometry( (xfs_sb_version_hassparseinodes(&mp->m_sb) ? XFS_FSOP_GEOM_FLAGS_SPINODES : 0) | (xfs_sb_version_hasrmapbt(&mp->m_sb) ? - XFS_FSOP_GEOM_FLAGS_RMAPBT : 0); + XFS_FSOP_GEOM_FLAGS_RMAPBT : 0) | + (xfs_sb_version_hasreflink(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_REFLINK : 0); geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ? mp->m_sb.sb_logsectsize : BBSIZE; geo->rtsectsize = mp->m_sb.sb_blocksize; -- cgit v1.2.3-59-g8ed1b From 11715a21bc3035440b853a0334685f1a55ca8c3c Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:31 -0700 Subject: xfs: don't allow reflinked dir/dev/fifo/socket/pipe files Only non-rt files can be reflinked, so check that when we load an inode. Also, don't leak the attr fork if there's a failure. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_inode_fork.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c index bbcc8c7a44b3..7699a033dd3c 100644 --- a/fs/xfs/libxfs/xfs_inode_fork.c +++ b/fs/xfs/libxfs/xfs_inode_fork.c @@ -121,6 +121,26 @@ xfs_iformat_fork( return -EFSCORRUPTED; } + if (unlikely(xfs_is_reflink_inode(ip) && + (VFS_I(ip)->i_mode & S_IFMT) != S_IFREG)) { + xfs_warn(ip->i_mount, + "corrupt dinode %llu, wrong file type for reflink.", + ip->i_ino); + XFS_CORRUPTION_ERROR("xfs_iformat(reflink)", + XFS_ERRLEVEL_LOW, ip->i_mount, dip); + return -EFSCORRUPTED; + } + + if (unlikely(xfs_is_reflink_inode(ip) && + (ip->i_d.di_flags & XFS_DIFLAG_REALTIME))) { + xfs_warn(ip->i_mount, + "corrupt dinode %llu, has reflink+realtime flag set.", + ip->i_ino); + XFS_CORRUPTION_ERROR("xfs_iformat(reflink)", + XFS_ERRLEVEL_LOW, ip->i_mount, dip); + return -EFSCORRUPTED; + } + switch (VFS_I(ip)->i_mode & S_IFMT) { case S_IFIFO: case S_IFCHR: @@ -208,7 +228,8 @@ xfs_iformat_fork( XFS_CORRUPTION_ERROR("xfs_iformat(8)", XFS_ERRLEVEL_LOW, ip->i_mount, dip); - return -EFSCORRUPTED; + error = -EFSCORRUPTED; + break; } error = xfs_iformat_local(ip, dip, XFS_ATTR_FORK, size); -- cgit v1.2.3-59-g8ed1b From 3993baeb3c52f497d243a4a3b5510df97b22596b Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:32 -0700 Subject: xfs: introduce the CoW fork Introduce a new in-core fork for storing copy-on-write delalloc reservations and allocated extents that are in the process of being written out. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/Makefile | 1 + fs/xfs/libxfs/xfs_bmap.c | 27 +++++++--- fs/xfs/libxfs/xfs_bmap.h | 22 ++++++-- fs/xfs/libxfs/xfs_bmap_btree.c | 1 + fs/xfs/libxfs/xfs_inode_fork.c | 47 +++++++++++++++-- fs/xfs/libxfs/xfs_inode_fork.h | 28 +++++++--- fs/xfs/libxfs/xfs_rmap.c | 15 +++--- fs/xfs/libxfs/xfs_types.h | 1 + fs/xfs/xfs_icache.c | 5 ++ fs/xfs/xfs_inode.h | 4 ++ fs/xfs/xfs_reflink.c | 114 +++++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_reflink.h | 23 +++++++++ fs/xfs/xfs_trace.h | 4 +- 13 files changed, 264 insertions(+), 28 deletions(-) create mode 100644 fs/xfs/xfs_reflink.c create mode 100644 fs/xfs/xfs_reflink.h (limited to 'fs') diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile index 6afb2281bc01..26ef1958b65b 100644 --- a/fs/xfs/Makefile +++ b/fs/xfs/Makefile @@ -90,6 +90,7 @@ xfs-y += xfs_aops.o \ xfs_message.o \ xfs_mount.o \ xfs_mru_cache.o \ + xfs_reflink.o \ xfs_stats.o \ xfs_super.o \ xfs_symlink.o \ diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 2be1fd3fac47..dc24dd0e7128 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -2924,6 +2924,7 @@ xfs_bmap_add_extent_hole_real( ASSERT(!isnullstartblock(new->br_startblock)); ASSERT(!bma->cur || !(bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL)); + ASSERT(whichfork != XFS_COW_FORK); XFS_STATS_INC(mp, xs_add_exlist); @@ -4072,12 +4073,11 @@ xfs_bmapi_read( int error; int eof; int n = 0; - int whichfork = (flags & XFS_BMAPI_ATTRFORK) ? - XFS_ATTR_FORK : XFS_DATA_FORK; + int whichfork = xfs_bmapi_whichfork(flags); ASSERT(*nmap >= 1); ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK|XFS_BMAPI_ENTIRE| - XFS_BMAPI_IGSTATE))); + XFS_BMAPI_IGSTATE|XFS_BMAPI_COWFORK))); ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)); if (unlikely(XFS_TEST_ERROR( @@ -4095,6 +4095,16 @@ xfs_bmapi_read( ifp = XFS_IFORK_PTR(ip, whichfork); + /* No CoW fork? Return a hole. */ + if (whichfork == XFS_COW_FORK && !ifp) { + mval->br_startoff = bno; + mval->br_startblock = HOLESTARTBLOCK; + mval->br_blockcount = len; + mval->br_state = XFS_EXT_NORM; + *nmap = 1; + return 0; + } + if (!(ifp->if_flags & XFS_IFEXTENTS)) { error = xfs_iread_extents(NULL, ip, whichfork); if (error) @@ -4368,8 +4378,7 @@ xfs_bmapi_convert_unwritten( xfs_filblks_t len, int flags) { - int whichfork = (flags & XFS_BMAPI_ATTRFORK) ? - XFS_ATTR_FORK : XFS_DATA_FORK; + int whichfork = xfs_bmapi_whichfork(flags); struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork); int tmp_logflags = 0; int error; @@ -4385,6 +4394,8 @@ xfs_bmapi_convert_unwritten( (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) return 0; + ASSERT(whichfork != XFS_COW_FORK); + /* * Modify (by adding) the state flag, if writing. */ @@ -4795,6 +4806,8 @@ xfs_bmap_del_extent( if (whichfork == XFS_ATTR_FORK) state |= BMAP_ATTRFORK; + else if (whichfork == XFS_COW_FORK) + state |= BMAP_COWFORK; ifp = XFS_IFORK_PTR(ip, whichfork); ASSERT((*idx >= 0) && (*idx < ifp->if_bytes / @@ -5133,8 +5146,8 @@ __xfs_bunmapi( trace_xfs_bunmap(ip, bno, len, flags, _RET_IP_); - whichfork = (flags & XFS_BMAPI_ATTRFORK) ? - XFS_ATTR_FORK : XFS_DATA_FORK; + whichfork = xfs_bmapi_whichfork(flags); + ASSERT(whichfork != XFS_COW_FORK); ifp = XFS_IFORK_PTR(ip, whichfork); if (unlikely( XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS && diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index 85e3b9d91ade..87741274c114 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -107,6 +107,9 @@ struct xfs_extent_free_item */ #define XFS_BMAPI_REMAP 0x100 +/* Map something in the CoW fork. */ +#define XFS_BMAPI_COWFORK 0x200 + #define XFS_BMAPI_FLAGS \ { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ { XFS_BMAPI_METADATA, "METADATA" }, \ @@ -116,12 +119,23 @@ struct xfs_extent_free_item { XFS_BMAPI_CONTIG, "CONTIG" }, \ { XFS_BMAPI_CONVERT, "CONVERT" }, \ { XFS_BMAPI_ZERO, "ZERO" }, \ - { XFS_BMAPI_REMAP, "REMAP" } + { XFS_BMAPI_REMAP, "REMAP" }, \ + { XFS_BMAPI_COWFORK, "COWFORK" } static inline int xfs_bmapi_aflag(int w) { - return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0); + return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : + (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0)); +} + +static inline int xfs_bmapi_whichfork(int bmapi_flags) +{ + if (bmapi_flags & XFS_BMAPI_COWFORK) + return XFS_COW_FORK; + else if (bmapi_flags & XFS_BMAPI_ATTRFORK) + return XFS_ATTR_FORK; + return XFS_DATA_FORK; } /* @@ -142,13 +156,15 @@ static inline int xfs_bmapi_aflag(int w) #define BMAP_LEFT_VALID (1 << 6) #define BMAP_RIGHT_VALID (1 << 7) #define BMAP_ATTRFORK (1 << 8) +#define BMAP_COWFORK (1 << 9) #define XFS_BMAP_EXT_FLAGS \ { BMAP_LEFT_CONTIG, "LC" }, \ { BMAP_RIGHT_CONTIG, "RC" }, \ { BMAP_LEFT_FILLING, "LF" }, \ { BMAP_RIGHT_FILLING, "RF" }, \ - { BMAP_ATTRFORK, "ATTR" } + { BMAP_ATTRFORK, "ATTR" }, \ + { BMAP_COWFORK, "COW" } /* diff --git a/fs/xfs/libxfs/xfs_bmap_btree.c b/fs/xfs/libxfs/xfs_bmap_btree.c index cd85274e810c..37f0d9daafce 100644 --- a/fs/xfs/libxfs/xfs_bmap_btree.c +++ b/fs/xfs/libxfs/xfs_bmap_btree.c @@ -777,6 +777,7 @@ xfs_bmbt_init_cursor( { struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); struct xfs_btree_cur *cur; + ASSERT(whichfork != XFS_COW_FORK); cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP); diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c index 7699a033dd3c..5dd56d3dbb3a 100644 --- a/fs/xfs/libxfs/xfs_inode_fork.c +++ b/fs/xfs/libxfs/xfs_inode_fork.c @@ -206,9 +206,14 @@ xfs_iformat_fork( XFS_ERROR_REPORT("xfs_iformat(7)", XFS_ERRLEVEL_LOW, ip->i_mount); return -EFSCORRUPTED; } - if (error) { + if (error) return error; + + if (xfs_is_reflink_inode(ip)) { + ASSERT(ip->i_cowfp == NULL); + xfs_ifork_init_cow(ip); } + if (!XFS_DFORK_Q(dip)) return 0; @@ -247,6 +252,9 @@ xfs_iformat_fork( if (error) { kmem_zone_free(xfs_ifork_zone, ip->i_afp); ip->i_afp = NULL; + if (ip->i_cowfp) + kmem_zone_free(xfs_ifork_zone, ip->i_cowfp); + ip->i_cowfp = NULL; xfs_idestroy_fork(ip, XFS_DATA_FORK); } return error; @@ -761,6 +769,9 @@ xfs_idestroy_fork( if (whichfork == XFS_ATTR_FORK) { kmem_zone_free(xfs_ifork_zone, ip->i_afp); ip->i_afp = NULL; + } else if (whichfork == XFS_COW_FORK) { + kmem_zone_free(xfs_ifork_zone, ip->i_cowfp); + ip->i_cowfp = NULL; } } @@ -948,6 +959,19 @@ xfs_iext_get_ext( } } +/* Convert bmap state flags to an inode fork. */ +struct xfs_ifork * +xfs_iext_state_to_fork( + struct xfs_inode *ip, + int state) +{ + if (state & BMAP_COWFORK) + return ip->i_cowfp; + else if (state & BMAP_ATTRFORK) + return ip->i_afp; + return &ip->i_df; +} + /* * Insert new item(s) into the extent records for incore inode * fork 'ifp'. 'count' new items are inserted at index 'idx'. @@ -960,7 +984,7 @@ xfs_iext_insert( xfs_bmbt_irec_t *new, /* items to insert */ int state) /* type of extent conversion */ { - xfs_ifork_t *ifp = (state & BMAP_ATTRFORK) ? ip->i_afp : &ip->i_df; + xfs_ifork_t *ifp = xfs_iext_state_to_fork(ip, state); xfs_extnum_t i; /* extent record index */ trace_xfs_iext_insert(ip, idx, new, state, _RET_IP_); @@ -1210,7 +1234,7 @@ xfs_iext_remove( int ext_diff, /* number of extents to remove */ int state) /* type of extent conversion */ { - xfs_ifork_t *ifp = (state & BMAP_ATTRFORK) ? ip->i_afp : &ip->i_df; + xfs_ifork_t *ifp = xfs_iext_state_to_fork(ip, state); xfs_extnum_t nextents; /* number of extents in file */ int new_size; /* size of extents after removal */ @@ -1955,3 +1979,20 @@ xfs_iext_irec_update_extoffs( ifp->if_u1.if_ext_irec[i].er_extoff += ext_diff; } } + +/* + * Initialize an inode's copy-on-write fork. + */ +void +xfs_ifork_init_cow( + struct xfs_inode *ip) +{ + if (ip->i_cowfp) + return; + + ip->i_cowfp = kmem_zone_zalloc(xfs_ifork_zone, + KM_SLEEP | KM_NOFS); + ip->i_cowfp->if_flags = XFS_IFEXTENTS; + ip->i_cformat = XFS_DINODE_FMT_EXTENTS; + ip->i_cnextents = 0; +} diff --git a/fs/xfs/libxfs/xfs_inode_fork.h b/fs/xfs/libxfs/xfs_inode_fork.h index f95e072ae646..c9476f50e32d 100644 --- a/fs/xfs/libxfs/xfs_inode_fork.h +++ b/fs/xfs/libxfs/xfs_inode_fork.h @@ -92,7 +92,9 @@ typedef struct xfs_ifork { #define XFS_IFORK_PTR(ip,w) \ ((w) == XFS_DATA_FORK ? \ &(ip)->i_df : \ - (ip)->i_afp) + ((w) == XFS_ATTR_FORK ? \ + (ip)->i_afp : \ + (ip)->i_cowfp)) #define XFS_IFORK_DSIZE(ip) \ (XFS_IFORK_Q(ip) ? \ XFS_IFORK_BOFF(ip) : \ @@ -105,26 +107,38 @@ typedef struct xfs_ifork { #define XFS_IFORK_SIZE(ip,w) \ ((w) == XFS_DATA_FORK ? \ XFS_IFORK_DSIZE(ip) : \ - XFS_IFORK_ASIZE(ip)) + ((w) == XFS_ATTR_FORK ? \ + XFS_IFORK_ASIZE(ip) : \ + 0)) #define XFS_IFORK_FORMAT(ip,w) \ ((w) == XFS_DATA_FORK ? \ (ip)->i_d.di_format : \ - (ip)->i_d.di_aformat) + ((w) == XFS_ATTR_FORK ? \ + (ip)->i_d.di_aformat : \ + (ip)->i_cformat)) #define XFS_IFORK_FMT_SET(ip,w,n) \ ((w) == XFS_DATA_FORK ? \ ((ip)->i_d.di_format = (n)) : \ - ((ip)->i_d.di_aformat = (n))) + ((w) == XFS_ATTR_FORK ? \ + ((ip)->i_d.di_aformat = (n)) : \ + ((ip)->i_cformat = (n)))) #define XFS_IFORK_NEXTENTS(ip,w) \ ((w) == XFS_DATA_FORK ? \ (ip)->i_d.di_nextents : \ - (ip)->i_d.di_anextents) + ((w) == XFS_ATTR_FORK ? \ + (ip)->i_d.di_anextents : \ + (ip)->i_cnextents)) #define XFS_IFORK_NEXT_SET(ip,w,n) \ ((w) == XFS_DATA_FORK ? \ ((ip)->i_d.di_nextents = (n)) : \ - ((ip)->i_d.di_anextents = (n))) + ((w) == XFS_ATTR_FORK ? \ + ((ip)->i_d.di_anextents = (n)) : \ + ((ip)->i_cnextents = (n)))) #define XFS_IFORK_MAXEXT(ip, w) \ (XFS_IFORK_SIZE(ip, w) / sizeof(xfs_bmbt_rec_t)) +struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state); + int xfs_iformat_fork(struct xfs_inode *, struct xfs_dinode *); void xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *, struct xfs_inode_log_item *, int); @@ -169,4 +183,6 @@ void xfs_iext_irec_update_extoffs(struct xfs_ifork *, int, int); extern struct kmem_zone *xfs_ifork_zone; +extern void xfs_ifork_init_cow(struct xfs_inode *ip); + #endif /* __XFS_INODE_FORK_H__ */ diff --git a/fs/xfs/libxfs/xfs_rmap.c b/fs/xfs/libxfs/xfs_rmap.c index 73d05407d663..1c40b851a21d 100644 --- a/fs/xfs/libxfs/xfs_rmap.c +++ b/fs/xfs/libxfs/xfs_rmap.c @@ -1263,9 +1263,10 @@ out_cur: */ static bool xfs_rmap_update_is_needed( - struct xfs_mount *mp) + struct xfs_mount *mp, + int whichfork) { - return xfs_sb_version_hasrmapbt(&mp->m_sb); + return xfs_sb_version_hasrmapbt(&mp->m_sb) && whichfork != XFS_COW_FORK; } /* @@ -1311,7 +1312,7 @@ xfs_rmap_map_extent( int whichfork, struct xfs_bmbt_irec *PREV) { - if (!xfs_rmap_update_is_needed(mp)) + if (!xfs_rmap_update_is_needed(mp, whichfork)) return 0; return __xfs_rmap_add(mp, dfops, XFS_RMAP_MAP, ip->i_ino, @@ -1327,7 +1328,7 @@ xfs_rmap_unmap_extent( int whichfork, struct xfs_bmbt_irec *PREV) { - if (!xfs_rmap_update_is_needed(mp)) + if (!xfs_rmap_update_is_needed(mp, whichfork)) return 0; return __xfs_rmap_add(mp, dfops, XFS_RMAP_UNMAP, ip->i_ino, @@ -1343,7 +1344,7 @@ xfs_rmap_convert_extent( int whichfork, struct xfs_bmbt_irec *PREV) { - if (!xfs_rmap_update_is_needed(mp)) + if (!xfs_rmap_update_is_needed(mp, whichfork)) return 0; return __xfs_rmap_add(mp, dfops, XFS_RMAP_CONVERT, ip->i_ino, @@ -1362,7 +1363,7 @@ xfs_rmap_alloc_extent( { struct xfs_bmbt_irec bmap; - if (!xfs_rmap_update_is_needed(mp)) + if (!xfs_rmap_update_is_needed(mp, XFS_DATA_FORK)) return 0; bmap.br_startblock = XFS_AGB_TO_FSB(mp, agno, bno); @@ -1386,7 +1387,7 @@ xfs_rmap_free_extent( { struct xfs_bmbt_irec bmap; - if (!xfs_rmap_update_is_needed(mp)) + if (!xfs_rmap_update_is_needed(mp, XFS_DATA_FORK)) return 0; bmap.br_startblock = XFS_AGB_TO_FSB(mp, agno, bno); diff --git a/fs/xfs/libxfs/xfs_types.h b/fs/xfs/libxfs/xfs_types.h index be7b6de5137d..8d74870468c2 100644 --- a/fs/xfs/libxfs/xfs_types.h +++ b/fs/xfs/libxfs/xfs_types.h @@ -90,6 +90,7 @@ typedef __int64_t xfs_sfiloff_t; /* signed block number in a file */ */ #define XFS_DATA_FORK 0 #define XFS_ATTR_FORK 1 +#define XFS_COW_FORK 2 /* * Min numbers of data/attr fork btree root pointers. diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c index 65b2e3f85f52..2d3de02f3529 100644 --- a/fs/xfs/xfs_icache.c +++ b/fs/xfs/xfs_icache.c @@ -76,6 +76,9 @@ xfs_inode_alloc( ip->i_mount = mp; memset(&ip->i_imap, 0, sizeof(struct xfs_imap)); ip->i_afp = NULL; + ip->i_cowfp = NULL; + ip->i_cnextents = 0; + ip->i_cformat = XFS_DINODE_FMT_EXTENTS; memset(&ip->i_df, 0, sizeof(xfs_ifork_t)); ip->i_flags = 0; ip->i_delayed_blks = 0; @@ -101,6 +104,8 @@ xfs_inode_free_callback( if (ip->i_afp) xfs_idestroy_fork(ip, XFS_ATTR_FORK); + if (ip->i_cowfp) + xfs_idestroy_fork(ip, XFS_COW_FORK); if (ip->i_itemp) { ASSERT(!(ip->i_itemp->ili_item.li_flags & XFS_LI_IN_AIL)); diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index 4be32036e16a..ff6fc03c0092 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -47,6 +47,7 @@ typedef struct xfs_inode { /* Extent information. */ xfs_ifork_t *i_afp; /* attribute fork pointer */ + xfs_ifork_t *i_cowfp; /* copy on write extents */ xfs_ifork_t i_df; /* data fork */ /* operations vectors */ @@ -65,6 +66,9 @@ typedef struct xfs_inode { struct xfs_icdinode i_d; /* most of ondisk inode */ + xfs_extnum_t i_cnextents; /* # of extents in cow fork */ + unsigned int i_cformat; /* format of cow fork */ + /* VFS inode */ struct inode i_vnode; /* embedded VFS inode */ } xfs_inode_t; diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c new file mode 100644 index 000000000000..7adbb83df040 --- /dev/null +++ b/fs/xfs/xfs_reflink.c @@ -0,0 +1,114 @@ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_mount.h" +#include "xfs_defer.h" +#include "xfs_da_format.h" +#include "xfs_da_btree.h" +#include "xfs_inode.h" +#include "xfs_trans.h" +#include "xfs_inode_item.h" +#include "xfs_bmap.h" +#include "xfs_bmap_util.h" +#include "xfs_error.h" +#include "xfs_dir2.h" +#include "xfs_dir2_priv.h" +#include "xfs_ioctl.h" +#include "xfs_trace.h" +#include "xfs_log.h" +#include "xfs_icache.h" +#include "xfs_pnfs.h" +#include "xfs_refcount_btree.h" +#include "xfs_refcount.h" +#include "xfs_bmap_btree.h" +#include "xfs_trans_space.h" +#include "xfs_bit.h" +#include "xfs_alloc.h" +#include "xfs_quota_defs.h" +#include "xfs_quota.h" +#include "xfs_btree.h" +#include "xfs_bmap_btree.h" +#include "xfs_reflink.h" + +/* + * Copy on Write of Shared Blocks + * + * XFS must preserve "the usual" file semantics even when two files share + * the same physical blocks. This means that a write to one file must not + * alter the blocks in a different file; the way that we'll do that is + * through the use of a copy-on-write mechanism. At a high level, that + * means that when we want to write to a shared block, we allocate a new + * block, write the data to the new block, and if that succeeds we map the + * new block into the file. + * + * XFS provides a "delayed allocation" mechanism that defers the allocation + * of disk blocks to dirty-but-not-yet-mapped file blocks as long as + * possible. This reduces fragmentation by enabling the filesystem to ask + * for bigger chunks less often, which is exactly what we want for CoW. + * + * The delalloc mechanism begins when the kernel wants to make a block + * writable (write_begin or page_mkwrite). If the offset is not mapped, we + * create a delalloc mapping, which is a regular in-core extent, but without + * a real startblock. (For delalloc mappings, the startblock encodes both + * a flag that this is a delalloc mapping, and a worst-case estimate of how + * many blocks might be required to put the mapping into the BMBT.) delalloc + * mappings are a reservation against the free space in the filesystem; + * adjacent mappings can also be combined into fewer larger mappings. + * + * When dirty pages are being written out (typically in writepage), the + * delalloc reservations are converted into real mappings by allocating + * blocks and replacing the delalloc mapping with real ones. A delalloc + * mapping can be replaced by several real ones if the free space is + * fragmented. + * + * We want to adapt the delalloc mechanism for copy-on-write, since the + * write paths are similar. The first two steps (creating the reservation + * and allocating the blocks) are exactly the same as delalloc except that + * the mappings must be stored in a separate CoW fork because we do not want + * to disturb the mapping in the data fork until we're sure that the write + * succeeded. IO completion in this case is the process of removing the old + * mapping from the data fork and moving the new mapping from the CoW fork to + * the data fork. This will be discussed shortly. + * + * For now, unaligned directio writes will be bounced back to the page cache. + * Block-aligned directio writes will use the same mechanism as buffered + * writes. + * + * CoW remapping must be done after the data block write completes, + * because we don't want to destroy the old data fork map until we're sure + * the new block has been written. Since the new mappings are kept in a + * separate fork, we can simply iterate these mappings to find the ones + * that cover the file blocks that we just CoW'd. For each extent, simply + * unmap the corresponding range in the data fork, map the new range into + * the data fork, and remove the extent from the CoW fork. + * + * Since the remapping operation can be applied to an arbitrary file + * range, we record the need for the remap step as a flag in the ioend + * instead of declaring a new IO type. This is required for direct io + * because we only have ioend for the whole dio, and we have to be able to + * remember the presence of unwritten blocks and CoW blocks with a single + * ioend structure. Better yet, the more ground we can cover with one + * ioend, the better. + */ diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h new file mode 100644 index 000000000000..820b151c8206 --- /dev/null +++ b/fs/xfs/xfs_reflink.h @@ -0,0 +1,23 @@ +/* + * Copyright (C) 2016 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#ifndef __XFS_REFLINK_H +#define __XFS_REFLINK_H 1 + +#endif /* __XFS_REFLINK_H */ diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 476bf2b54aeb..ae59c3c5b417 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -269,10 +269,10 @@ DECLARE_EVENT_CLASS(xfs_bmap_class, __field(unsigned long, caller_ip) ), TP_fast_assign( - struct xfs_ifork *ifp = (state & BMAP_ATTRFORK) ? - ip->i_afp : &ip->i_df; + struct xfs_ifork *ifp; struct xfs_bmbt_irec r; + ifp = xfs_iext_state_to_fork(ip, state); xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx), &r); __entry->dev = VFS_I(ip)->i_sb->s_dev; __entry->ino = ip->i_ino; -- cgit v1.2.3-59-g8ed1b From be51f8119c2f5e27437d2c4271f6419f3b8e609f Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:32 -0700 Subject: xfs: support bmapping delalloc extents in the CoW fork Allow the creation of delayed allocation extents in the CoW fork. In a subsequent patch we'll wire up iomap_begin to actually do this via reflink helper functions. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_bmap.c | 12 ++++++++---- fs/xfs/libxfs/xfs_bmap.h | 7 ++++--- fs/xfs/xfs_iomap.c | 2 +- fs/xfs/xfs_trace.h | 6 +++--- 4 files changed, 16 insertions(+), 11 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index dc24dd0e7128..ffe47435eaf4 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -2760,6 +2760,7 @@ done: STATIC void xfs_bmap_add_extent_hole_delay( xfs_inode_t *ip, /* incore inode pointer */ + int whichfork, xfs_extnum_t *idx, /* extent number to update/insert */ xfs_bmbt_irec_t *new) /* new data to add to file extents */ { @@ -2771,8 +2772,10 @@ xfs_bmap_add_extent_hole_delay( int state; /* state bits, accessed thru macros */ xfs_filblks_t temp=0; /* temp for indirect calculations */ - ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); + ifp = XFS_IFORK_PTR(ip, whichfork); state = 0; + if (whichfork == XFS_COW_FORK) + state |= BMAP_COWFORK; ASSERT(isnullstartblock(new->br_startblock)); /* @@ -2790,7 +2793,7 @@ xfs_bmap_add_extent_hole_delay( * Check and set flags if the current (right) segment exists. * If it doesn't exist, we're converting the hole at end-of-file. */ - if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) { + if (*idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) { state |= BMAP_RIGHT_VALID; xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right); @@ -4154,6 +4157,7 @@ xfs_bmapi_read( int xfs_bmapi_reserve_delalloc( struct xfs_inode *ip, + int whichfork, xfs_fileoff_t aoff, xfs_filblks_t len, struct xfs_bmbt_irec *got, @@ -4162,7 +4166,7 @@ xfs_bmapi_reserve_delalloc( int eof) { struct xfs_mount *mp = ip->i_mount; - struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); + struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); xfs_extlen_t alen; xfs_extlen_t indlen; char rt = XFS_IS_REALTIME_INODE(ip); @@ -4221,7 +4225,7 @@ xfs_bmapi_reserve_delalloc( got->br_startblock = nullstartblock(indlen); got->br_blockcount = alen; got->br_state = XFS_EXT_NORM; - xfs_bmap_add_extent_hole_delay(ip, lastx, got); + xfs_bmap_add_extent_hole_delay(ip, whichfork, lastx, got); /* * Update our extent pointer, given that xfs_bmap_add_extent_hole_delay diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index 87741274c114..c6fd52f40855 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -234,9 +234,10 @@ struct xfs_bmbt_rec_host * xfs_bmap_search_extents(struct xfs_inode *ip, xfs_fileoff_t bno, int fork, int *eofp, xfs_extnum_t *lastxp, struct xfs_bmbt_irec *gotp, struct xfs_bmbt_irec *prevp); -int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, xfs_fileoff_t aoff, - xfs_filblks_t len, struct xfs_bmbt_irec *got, - struct xfs_bmbt_irec *prev, xfs_extnum_t *lastx, int eof); +int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork, + xfs_fileoff_t aoff, xfs_filblks_t len, + struct xfs_bmbt_irec *got, struct xfs_bmbt_irec *prev, + xfs_extnum_t *lastx, int eof); enum xfs_bmap_intent_type { XFS_BMAP_MAP = 1, diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index c08253e11545..59c7beb48ef6 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -609,7 +609,7 @@ xfs_file_iomap_begin_delay( } retry: - error = xfs_bmapi_reserve_delalloc(ip, offset_fsb, + error = xfs_bmapi_reserve_delalloc(ip, XFS_DATA_FORK, offset_fsb, end_fsb - offset_fsb, &got, &prev, &idx, eof); switch (error) { diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index ae59c3c5b417..adfb43d0e108 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -3329,16 +3329,17 @@ DEFINE_INODE_ERROR_EVENT(xfs_reflink_dirty_page_error); /* copy on write */ DEFINE_INODE_IREC_EVENT(xfs_reflink_trim_around_shared); +DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_alloc); +DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_found); +DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_enospc); DEFINE_RW_EVENT(xfs_reflink_reserve_cow_range); -DEFINE_INODE_IREC_EVENT(xfs_reflink_reserve_cow_extent); DEFINE_RW_EVENT(xfs_reflink_allocate_cow_range); DEFINE_INODE_IREC_EVENT(xfs_reflink_allocate_cow_extent); DEFINE_INODE_IREC_EVENT(xfs_reflink_bounce_dio_write); DEFINE_IOMAP_EVENT(xfs_reflink_find_cow_mapping); DEFINE_INODE_IREC_EVENT(xfs_reflink_trim_irec); -DEFINE_SIMPLE_IO_EVENT(xfs_iomap_cow_delay); DEFINE_SIMPLE_IO_EVENT(xfs_reflink_cancel_cow_range); DEFINE_SIMPLE_IO_EVENT(xfs_reflink_end_cow); @@ -3346,7 +3347,6 @@ DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_remap); DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_remap_piece); DEFINE_INODE_ERROR_EVENT(xfs_reflink_reserve_cow_range_error); -DEFINE_INODE_ERROR_EVENT(xfs_reflink_reserve_cow_extent_error); DEFINE_INODE_ERROR_EVENT(xfs_reflink_allocate_cow_range_error); DEFINE_INODE_ERROR_EVENT(xfs_reflink_cancel_cow_range_error); DEFINE_INODE_ERROR_EVENT(xfs_reflink_end_cow_error); -- cgit v1.2.3-59-g8ed1b From 2a06705cd5954030a2c501a09ac1a24b1c4019c2 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:33 -0700 Subject: xfs: create delalloc extents in CoW fork Wire up iomap_begin to detect shared extents and create delayed allocation extents in the CoW fork: 1) Check if we already have an extent in the COW fork for the area. If so nothing to do, we can move along. 2) Look up block number for the current extent, and if there is none it's not shared move along. 3) Unshare the current extent as far as we are going to write into it. For this we avoid an additional COW fork lookup and use the information we set aside in step 1) above. 4) Goto 1) unless we've covered the whole range. Last but not least, this updates the xfs_reflink_reserve_cow_range calling convention to pass a byte offset and length, as that is what both callers expect anyway. This patch has been refactored considerably as part of the iomap transition. Signed-off-by: Darrick J. Wong Signed-off-by: Christoph Hellwig --- fs/xfs/xfs_iomap.c | 12 ++- fs/xfs/xfs_reflink.c | 216 +++++++++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_reflink.h | 9 +++ 3 files changed, 235 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 59c7beb48ef6..e8312b0c9024 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -39,6 +39,7 @@ #include "xfs_quota.h" #include "xfs_dquot_item.h" #include "xfs_dquot.h" +#include "xfs_reflink.h" #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ @@ -961,8 +962,15 @@ xfs_file_iomap_begin( if (XFS_FORCED_SHUTDOWN(mp)) return -EIO; - if ((flags & IOMAP_WRITE) && - !IS_DAX(inode) && !xfs_get_extsz_hint(ip)) { + if ((flags & (IOMAP_WRITE | IOMAP_ZERO)) && xfs_is_reflink_inode(ip)) { + error = xfs_reflink_reserve_cow_range(ip, offset, length); + if (error < 0) + return error; + } + + if ((flags & IOMAP_WRITE) && !IS_DAX(inode) && + !xfs_get_extsz_hint(ip)) { + /* Reserve delalloc blocks for regular writeback. */ return xfs_file_iomap_begin_delay(inode, offset, length, flags, iomap); } diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 7adbb83df040..5d796b7f23d7 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -51,6 +51,7 @@ #include "xfs_btree.h" #include "xfs_bmap_btree.h" #include "xfs_reflink.h" +#include "xfs_iomap.h" /* * Copy on Write of Shared Blocks @@ -112,3 +113,218 @@ * ioend structure. Better yet, the more ground we can cover with one * ioend, the better. */ + +/* + * Given an AG extent, find the lowest-numbered run of shared blocks + * within that range and return the range in fbno/flen. If + * find_end_of_shared is true, return the longest contiguous extent of + * shared blocks. If there are no shared extents, fbno and flen will + * be set to NULLAGBLOCK and 0, respectively. + */ +int +xfs_reflink_find_shared( + struct xfs_mount *mp, + xfs_agnumber_t agno, + xfs_agblock_t agbno, + xfs_extlen_t aglen, + xfs_agblock_t *fbno, + xfs_extlen_t *flen, + bool find_end_of_shared) +{ + struct xfs_buf *agbp; + struct xfs_btree_cur *cur; + int error; + + error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp); + if (error) + return error; + + cur = xfs_refcountbt_init_cursor(mp, NULL, agbp, agno, NULL); + + error = xfs_refcount_find_shared(cur, agbno, aglen, fbno, flen, + find_end_of_shared); + + xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR); + + xfs_buf_relse(agbp); + return error; +} + +/* + * Trim the mapping to the next block where there's a change in the + * shared/unshared status. More specifically, this means that we + * find the lowest-numbered extent of shared blocks that coincides with + * the given block mapping. If the shared extent overlaps the start of + * the mapping, trim the mapping to the end of the shared extent. If + * the shared region intersects the mapping, trim the mapping to the + * start of the shared extent. If there are no shared regions that + * overlap, just return the original extent. + */ +int +xfs_reflink_trim_around_shared( + struct xfs_inode *ip, + struct xfs_bmbt_irec *irec, + bool *shared, + bool *trimmed) +{ + xfs_agnumber_t agno; + xfs_agblock_t agbno; + xfs_extlen_t aglen; + xfs_agblock_t fbno; + xfs_extlen_t flen; + int error = 0; + + /* Holes, unwritten, and delalloc extents cannot be shared */ + if (!xfs_is_reflink_inode(ip) || + ISUNWRITTEN(irec) || + irec->br_startblock == HOLESTARTBLOCK || + irec->br_startblock == DELAYSTARTBLOCK) { + *shared = false; + return 0; + } + + trace_xfs_reflink_trim_around_shared(ip, irec); + + agno = XFS_FSB_TO_AGNO(ip->i_mount, irec->br_startblock); + agbno = XFS_FSB_TO_AGBNO(ip->i_mount, irec->br_startblock); + aglen = irec->br_blockcount; + + error = xfs_reflink_find_shared(ip->i_mount, agno, agbno, + aglen, &fbno, &flen, true); + if (error) + return error; + + *shared = *trimmed = false; + if (fbno == NULLAGBLOCK) { + /* No shared blocks at all. */ + return 0; + } else if (fbno == agbno) { + /* + * The start of this extent is shared. Truncate the + * mapping at the end of the shared region so that a + * subsequent iteration starts at the start of the + * unshared region. + */ + irec->br_blockcount = flen; + *shared = true; + if (flen != aglen) + *trimmed = true; + return 0; + } else { + /* + * There's a shared extent midway through this extent. + * Truncate the mapping at the start of the shared + * extent so that a subsequent iteration starts at the + * start of the shared region. + */ + irec->br_blockcount = fbno - agbno; + *trimmed = true; + return 0; + } +} + +/* Create a CoW reservation for a range of blocks within a file. */ +static int +__xfs_reflink_reserve_cow( + struct xfs_inode *ip, + xfs_fileoff_t *offset_fsb, + xfs_fileoff_t end_fsb) +{ + struct xfs_bmbt_irec got, prev, imap; + xfs_fileoff_t orig_end_fsb; + int nimaps, eof = 0, error = 0; + bool shared = false, trimmed = false; + xfs_extnum_t idx; + + /* Already reserved? Skip the refcount btree access. */ + xfs_bmap_search_extents(ip, *offset_fsb, XFS_COW_FORK, &eof, &idx, + &got, &prev); + if (!eof && got.br_startoff <= *offset_fsb) { + end_fsb = orig_end_fsb = got.br_startoff + got.br_blockcount; + trace_xfs_reflink_cow_found(ip, &got); + goto done; + } + + /* Read extent from the source file. */ + nimaps = 1; + error = xfs_bmapi_read(ip, *offset_fsb, end_fsb - *offset_fsb, + &imap, &nimaps, 0); + if (error) + goto out_unlock; + ASSERT(nimaps == 1); + + /* Trim the mapping to the nearest shared extent boundary. */ + error = xfs_reflink_trim_around_shared(ip, &imap, &shared, &trimmed); + if (error) + goto out_unlock; + + end_fsb = orig_end_fsb = imap.br_startoff + imap.br_blockcount; + + /* Not shared? Just report the (potentially capped) extent. */ + if (!shared) + goto done; + + /* + * Fork all the shared blocks from our write offset until the end of + * the extent. + */ + error = xfs_qm_dqattach_locked(ip, 0); + if (error) + goto out_unlock; + +retry: + error = xfs_bmapi_reserve_delalloc(ip, XFS_COW_FORK, *offset_fsb, + end_fsb - *offset_fsb, &got, + &prev, &idx, eof); + switch (error) { + case 0: + break; + case -ENOSPC: + case -EDQUOT: + /* retry without any preallocation */ + trace_xfs_reflink_cow_enospc(ip, &imap); + if (end_fsb != orig_end_fsb) { + end_fsb = orig_end_fsb; + goto retry; + } + /*FALLTHRU*/ + default: + goto out_unlock; + } + + trace_xfs_reflink_cow_alloc(ip, &got); +done: + *offset_fsb = end_fsb; +out_unlock: + return error; +} + +/* Create a CoW reservation for part of a file. */ +int +xfs_reflink_reserve_cow_range( + struct xfs_inode *ip, + xfs_off_t offset, + xfs_off_t count) +{ + struct xfs_mount *mp = ip->i_mount; + xfs_fileoff_t offset_fsb, end_fsb; + int error; + + trace_xfs_reflink_reserve_cow_range(ip, offset, count); + + offset_fsb = XFS_B_TO_FSBT(mp, offset); + end_fsb = XFS_B_TO_FSB(mp, offset + count); + + xfs_ilock(ip, XFS_ILOCK_EXCL); + while (offset_fsb < end_fsb) { + error = __xfs_reflink_reserve_cow(ip, &offset_fsb, end_fsb); + if (error) { + trace_xfs_reflink_reserve_cow_range_error(ip, error, + _RET_IP_); + break; + } + } + xfs_iunlock(ip, XFS_ILOCK_EXCL); + + return error; +} diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h index 820b151c8206..f824f874234f 100644 --- a/fs/xfs/xfs_reflink.h +++ b/fs/xfs/xfs_reflink.h @@ -20,4 +20,13 @@ #ifndef __XFS_REFLINK_H #define __XFS_REFLINK_H 1 +extern int xfs_reflink_find_shared(struct xfs_mount *mp, xfs_agnumber_t agno, + xfs_agblock_t agbno, xfs_extlen_t aglen, xfs_agblock_t *fbno, + xfs_extlen_t *flen, bool find_maximal); +extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip, + struct xfs_bmbt_irec *irec, bool *shared, bool *trimmed); + +extern int xfs_reflink_reserve_cow_range(struct xfs_inode *ip, + xfs_off_t offset, xfs_off_t count); + #endif /* __XFS_REFLINK_H */ -- cgit v1.2.3-59-g8ed1b From 60b4984fc3924bff292ec46b95a3e98b34b8e259 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:34 -0700 Subject: xfs: support allocating delayed extents in CoW fork Modify xfs_bmap_add_extent_delay_real() so that we can convert delayed allocation extents in the CoW fork to real allocations, and wire this up all the way back to xfs_iomap_write_allocate(). In a subsequent patch, we'll modify the writepage handler to call this. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_bmap.c | 48 ++++++++++++++++++++++++++++++++---------------- fs/xfs/xfs_aops.c | 6 ++++-- fs/xfs/xfs_iomap.c | 7 ++++++- fs/xfs/xfs_iomap.h | 2 +- 4 files changed, 43 insertions(+), 20 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index ffe47435eaf4..e88cdb6c75e9 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -141,7 +141,8 @@ xfs_bmbt_lookup_ge( */ static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork) { - return XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS && + return whichfork != XFS_COW_FORK && + XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS && XFS_IFORK_NEXTENTS(ip, whichfork) > XFS_IFORK_MAXEXT(ip, whichfork); } @@ -151,7 +152,8 @@ static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork) */ static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork) { - return XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE && + return whichfork != XFS_COW_FORK && + XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE && XFS_IFORK_NEXTENTS(ip, whichfork) <= XFS_IFORK_MAXEXT(ip, whichfork); } @@ -641,6 +643,7 @@ xfs_bmap_btree_to_extents( mp = ip->i_mount; ifp = XFS_IFORK_PTR(ip, whichfork); + ASSERT(whichfork != XFS_COW_FORK); ASSERT(ifp->if_flags & XFS_IFEXTENTS); ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE); rblock = ifp->if_broot; @@ -707,6 +710,7 @@ xfs_bmap_extents_to_btree( xfs_bmbt_ptr_t *pp; /* root block address pointer */ mp = ip->i_mount; + ASSERT(whichfork != XFS_COW_FORK); ifp = XFS_IFORK_PTR(ip, whichfork); ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS); @@ -838,6 +842,7 @@ xfs_bmap_local_to_extents_empty( { struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); + ASSERT(whichfork != XFS_COW_FORK); ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL); ASSERT(ifp->if_bytes == 0); ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0); @@ -1671,7 +1676,8 @@ xfs_bmap_one_block( */ STATIC int /* error */ xfs_bmap_add_extent_delay_real( - struct xfs_bmalloca *bma) + struct xfs_bmalloca *bma, + int whichfork) { struct xfs_bmbt_irec *new = &bma->got; int diff; /* temp value */ @@ -1689,11 +1695,14 @@ xfs_bmap_add_extent_delay_real( xfs_filblks_t temp=0; /* value for da_new calculations */ xfs_filblks_t temp2=0;/* value for da_new calculations */ int tmp_rval; /* partial logging flags */ - int whichfork = XFS_DATA_FORK; struct xfs_mount *mp; + xfs_extnum_t *nextents; mp = bma->ip->i_mount; ifp = XFS_IFORK_PTR(bma->ip, whichfork); + ASSERT(whichfork != XFS_ATTR_FORK); + nextents = (whichfork == XFS_COW_FORK ? &bma->ip->i_cnextents : + &bma->ip->i_d.di_nextents); ASSERT(bma->idx >= 0); ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec)); @@ -1707,6 +1716,9 @@ xfs_bmap_add_extent_delay_real( #define RIGHT r[1] #define PREV r[2] + if (whichfork == XFS_COW_FORK) + state |= BMAP_COWFORK; + /* * Set up a bunch of variables to make the tests simpler. */ @@ -1793,7 +1805,7 @@ xfs_bmap_add_extent_delay_real( trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_); xfs_iext_remove(bma->ip, bma->idx + 1, 2, state); - bma->ip->i_d.di_nextents--; + (*nextents)--; if (bma->cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { @@ -1895,7 +1907,7 @@ xfs_bmap_add_extent_delay_real( xfs_bmbt_set_startblock(ep, new->br_startblock); trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_); - bma->ip->i_d.di_nextents++; + (*nextents)++; if (bma->cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { @@ -1965,7 +1977,7 @@ xfs_bmap_add_extent_delay_real( temp = PREV.br_blockcount - new->br_blockcount; xfs_bmbt_set_blockcount(ep, temp); xfs_iext_insert(bma->ip, bma->idx, 1, new, state); - bma->ip->i_d.di_nextents++; + (*nextents)++; if (bma->cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { @@ -2049,7 +2061,7 @@ xfs_bmap_add_extent_delay_real( trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_); xfs_bmbt_set_blockcount(ep, temp); xfs_iext_insert(bma->ip, bma->idx + 1, 1, new, state); - bma->ip->i_d.di_nextents++; + (*nextents)++; if (bma->cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { @@ -2118,7 +2130,7 @@ xfs_bmap_add_extent_delay_real( RIGHT.br_blockcount = temp2; /* insert LEFT (r[0]) and RIGHT (r[1]) at the same time */ xfs_iext_insert(bma->ip, bma->idx + 1, 2, &LEFT, state); - bma->ip->i_d.di_nextents++; + (*nextents)++; if (bma->cur == NULL) rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; else { @@ -2216,7 +2228,8 @@ xfs_bmap_add_extent_delay_real( xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork); done: - bma->logflags |= rval; + if (whichfork != XFS_COW_FORK) + bma->logflags |= rval; return error; #undef LEFT #undef RIGHT @@ -3861,7 +3874,8 @@ xfs_bmap_btalloc( ASSERT(nullfb || fb_agno == args.agno || (ap->dfops->dop_low && fb_agno < args.agno)); ap->length = args.len; - ap->ip->i_d.di_nblocks += args.len; + if (!(ap->flags & XFS_BMAPI_COWFORK)) + ap->ip->i_d.di_nblocks += args.len; xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE); if (ap->wasdel) ap->ip->i_delayed_blks -= args.len; @@ -4256,8 +4270,7 @@ xfs_bmapi_allocate( struct xfs_bmalloca *bma) { struct xfs_mount *mp = bma->ip->i_mount; - int whichfork = (bma->flags & XFS_BMAPI_ATTRFORK) ? - XFS_ATTR_FORK : XFS_DATA_FORK; + int whichfork = xfs_bmapi_whichfork(bma->flags); struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork); int tmp_logflags = 0; int error; @@ -4352,7 +4365,7 @@ xfs_bmapi_allocate( bma->got.br_state = XFS_EXT_UNWRITTEN; if (bma->wasdel) - error = xfs_bmap_add_extent_delay_real(bma); + error = xfs_bmap_add_extent_delay_real(bma, whichfork); else error = xfs_bmap_add_extent_hole_real(bma, whichfork); @@ -4506,8 +4519,7 @@ xfs_bmapi_write( orig_mval = mval; orig_nmap = *nmap; #endif - whichfork = (flags & XFS_BMAPI_ATTRFORK) ? - XFS_ATTR_FORK : XFS_DATA_FORK; + whichfork = xfs_bmapi_whichfork(flags); ASSERT(*nmap >= 1); ASSERT(*nmap <= XFS_BMAP_MAX_NMAP); @@ -4519,6 +4531,8 @@ xfs_bmapi_write( ASSERT(!(flags & XFS_BMAPI_REMAP) || whichfork == XFS_DATA_FORK); ASSERT(!(flags & XFS_BMAPI_PREALLOC) || !(flags & XFS_BMAPI_REMAP)); ASSERT(!(flags & XFS_BMAPI_CONVERT) || !(flags & XFS_BMAPI_REMAP)); + ASSERT(!(flags & XFS_BMAPI_PREALLOC) || whichfork != XFS_COW_FORK); + ASSERT(!(flags & XFS_BMAPI_CONVERT) || whichfork != XFS_COW_FORK); /* zeroing is for currently only for data extents, not metadata */ ASSERT((flags & (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO)) != @@ -4584,6 +4598,8 @@ xfs_bmapi_write( */ if (flags & XFS_BMAPI_REMAP) ASSERT(inhole); + if (flags & XFS_BMAPI_COWFORK) + ASSERT(!inhole); /* * First, deal with the hole before the allocated space diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 4a28fa91e3b1..007a520b5ddc 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -362,9 +362,11 @@ xfs_map_blocks( if (type == XFS_IO_DELALLOC && (!nimaps || isnullstartblock(imap->br_startblock))) { - error = xfs_iomap_write_allocate(ip, offset, imap); + error = xfs_iomap_write_allocate(ip, XFS_DATA_FORK, offset, + imap); if (!error) - trace_xfs_map_blocks_alloc(ip, offset, count, type, imap); + trace_xfs_map_blocks_alloc(ip, offset, count, type, + imap); return error; } diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index e8312b0c9024..ad6939df9680 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -667,6 +667,7 @@ out_unlock: int xfs_iomap_write_allocate( xfs_inode_t *ip, + int whichfork, xfs_off_t offset, xfs_bmbt_irec_t *imap) { @@ -679,8 +680,12 @@ xfs_iomap_write_allocate( xfs_trans_t *tp; int nimaps; int error = 0; + int flags = 0; int nres; + if (whichfork == XFS_COW_FORK) + flags |= XFS_BMAPI_COWFORK; + /* * Make sure that the dquots are there. */ @@ -774,7 +779,7 @@ xfs_iomap_write_allocate( * pointer that the caller gave to us. */ error = xfs_bmapi_write(tp, ip, map_start_fsb, - count_fsb, 0, &first_block, + count_fsb, flags, &first_block, nres, imap, &nimaps, &dfops); if (error) diff --git a/fs/xfs/xfs_iomap.h b/fs/xfs/xfs_iomap.h index 6498be485932..a16b9567e76b 100644 --- a/fs/xfs/xfs_iomap.h +++ b/fs/xfs/xfs_iomap.h @@ -25,7 +25,7 @@ struct xfs_bmbt_irec; int xfs_iomap_write_direct(struct xfs_inode *, xfs_off_t, size_t, struct xfs_bmbt_irec *, int); -int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t, +int xfs_iomap_write_allocate(struct xfs_inode *, int, xfs_off_t, struct xfs_bmbt_irec *); int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, xfs_off_t); -- cgit v1.2.3-59-g8ed1b From ef4736678fc3ea426968bc82f907798ed5f51e85 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:34 -0700 Subject: xfs: allocate delayed extents in CoW fork Modify the writepage handler to find and convert pending delalloc extents to real allocations. Furthermore, when we're doing non-cow writes to a part of a file that already has a CoW reservation (the cowextsz hint that we set up in a subsequent patch facilitates this), promote the write to copy-on-write so that the entire extent can get written out as a single extent on disk, thereby reducing post-CoW fragmentation. Christoph moved the CoW support code in _map_blocks to a separate helper function, refactored other functions, and reduced the number of CoW fork lookups, so I merged those changes here to reduce churn. Signed-off-by: Darrick J. Wong Signed-off-by: Christoph Hellwig --- fs/xfs/xfs_aops.c | 97 ++++++++++++++++++++++++++++++++++++++++++---------- fs/xfs/xfs_aops.h | 4 ++- fs/xfs/xfs_reflink.c | 84 +++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_reflink.h | 4 +++ 4 files changed, 170 insertions(+), 19 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 007a520b5ddc..c76d7a603338 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -31,6 +31,7 @@ #include "xfs_bmap.h" #include "xfs_bmap_util.h" #include "xfs_bmap_btree.h" +#include "xfs_reflink.h" #include #include #include @@ -341,6 +342,7 @@ xfs_map_blocks( if (XFS_FORCED_SHUTDOWN(mp)) return -EIO; + ASSERT(type != XFS_IO_COW); if (type == XFS_IO_UNWRITTEN) bmapi_flags |= XFS_BMAPI_IGSTATE; @@ -355,6 +357,13 @@ xfs_map_blocks( offset_fsb = XFS_B_TO_FSBT(mp, offset); error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, imap, &nimaps, bmapi_flags); + /* + * Truncate an overwrite extent if there's a pending CoW + * reservation before the end of this extent. This forces us + * to come back to writepage to take care of the CoW. + */ + if (nimaps && type == XFS_IO_OVERWRITE) + xfs_reflink_trim_irec_to_next_cow(ip, offset_fsb, imap); xfs_iunlock(ip, XFS_ILOCK_SHARED); if (error) @@ -365,8 +374,7 @@ xfs_map_blocks( error = xfs_iomap_write_allocate(ip, XFS_DATA_FORK, offset, imap); if (!error) - trace_xfs_map_blocks_alloc(ip, offset, count, type, - imap); + trace_xfs_map_blocks_alloc(ip, offset, count, type, imap); return error; } @@ -739,6 +747,56 @@ out_invalidate: return; } +static int +xfs_map_cow( + struct xfs_writepage_ctx *wpc, + struct inode *inode, + loff_t offset, + unsigned int *new_type) +{ + struct xfs_inode *ip = XFS_I(inode); + struct xfs_bmbt_irec imap; + bool is_cow = false, need_alloc = false; + int error; + + /* + * If we already have a valid COW mapping keep using it. + */ + if (wpc->io_type == XFS_IO_COW) { + wpc->imap_valid = xfs_imap_valid(inode, &wpc->imap, offset); + if (wpc->imap_valid) { + *new_type = XFS_IO_COW; + return 0; + } + } + + /* + * Else we need to check if there is a COW mapping at this offset. + */ + xfs_ilock(ip, XFS_ILOCK_SHARED); + is_cow = xfs_reflink_find_cow_mapping(ip, offset, &imap, &need_alloc); + xfs_iunlock(ip, XFS_ILOCK_SHARED); + + if (!is_cow) + return 0; + + /* + * And if the COW mapping has a delayed extent here we need to + * allocate real space for it now. + */ + if (need_alloc) { + error = xfs_iomap_write_allocate(ip, XFS_COW_FORK, offset, + &imap); + if (error) + return error; + } + + wpc->io_type = *new_type = XFS_IO_COW; + wpc->imap_valid = true; + wpc->imap = imap; + return 0; +} + /* * We implement an immediate ioend submission policy here to avoid needing to * chain multiple ioends and hence nest mempool allocations which can violate @@ -771,6 +829,7 @@ xfs_writepage_map( int error = 0; int count = 0; int uptodate = 1; + unsigned int new_type; bh = head = page_buffers(page); offset = page_offset(page); @@ -791,22 +850,13 @@ xfs_writepage_map( continue; } - if (buffer_unwritten(bh)) { - if (wpc->io_type != XFS_IO_UNWRITTEN) { - wpc->io_type = XFS_IO_UNWRITTEN; - wpc->imap_valid = false; - } - } else if (buffer_delay(bh)) { - if (wpc->io_type != XFS_IO_DELALLOC) { - wpc->io_type = XFS_IO_DELALLOC; - wpc->imap_valid = false; - } - } else if (buffer_uptodate(bh)) { - if (wpc->io_type != XFS_IO_OVERWRITE) { - wpc->io_type = XFS_IO_OVERWRITE; - wpc->imap_valid = false; - } - } else { + if (buffer_unwritten(bh)) + new_type = XFS_IO_UNWRITTEN; + else if (buffer_delay(bh)) + new_type = XFS_IO_DELALLOC; + else if (buffer_uptodate(bh)) + new_type = XFS_IO_OVERWRITE; + else { if (PageUptodate(page)) ASSERT(buffer_mapped(bh)); /* @@ -819,6 +869,17 @@ xfs_writepage_map( continue; } + if (xfs_is_reflink_inode(XFS_I(inode))) { + error = xfs_map_cow(wpc, inode, offset, &new_type); + if (error) + goto out; + } + + if (wpc->io_type != new_type) { + wpc->io_type = new_type; + wpc->imap_valid = false; + } + if (wpc->imap_valid) wpc->imap_valid = xfs_imap_valid(inode, &wpc->imap, offset); diff --git a/fs/xfs/xfs_aops.h b/fs/xfs/xfs_aops.h index 1950e3bca2ac..b3c6634f9518 100644 --- a/fs/xfs/xfs_aops.h +++ b/fs/xfs/xfs_aops.h @@ -28,13 +28,15 @@ enum { XFS_IO_DELALLOC, /* covers delalloc region */ XFS_IO_UNWRITTEN, /* covers allocated but uninitialized data */ XFS_IO_OVERWRITE, /* covers already allocated extent */ + XFS_IO_COW, /* covers copy-on-write extent */ }; #define XFS_IO_TYPES \ { XFS_IO_INVALID, "invalid" }, \ { XFS_IO_DELALLOC, "delalloc" }, \ { XFS_IO_UNWRITTEN, "unwritten" }, \ - { XFS_IO_OVERWRITE, "overwrite" } + { XFS_IO_OVERWRITE, "overwrite" }, \ + { XFS_IO_COW, "CoW" } /* * Structure for buffered I/O completions. diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 5d796b7f23d7..d953df3a201c 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -328,3 +328,87 @@ xfs_reflink_reserve_cow_range( return error; } + +/* + * Find the CoW reservation (and whether or not it needs block allocation) + * for a given byte offset of a file. + */ +bool +xfs_reflink_find_cow_mapping( + struct xfs_inode *ip, + xfs_off_t offset, + struct xfs_bmbt_irec *imap, + bool *need_alloc) +{ + struct xfs_bmbt_irec irec; + struct xfs_ifork *ifp; + struct xfs_bmbt_rec_host *gotp; + xfs_fileoff_t bno; + xfs_extnum_t idx; + + ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL | XFS_ILOCK_SHARED)); + ASSERT(xfs_is_reflink_inode(ip)); + + /* Find the extent in the CoW fork. */ + ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK); + bno = XFS_B_TO_FSBT(ip->i_mount, offset); + gotp = xfs_iext_bno_to_ext(ifp, bno, &idx); + if (!gotp) + return false; + + xfs_bmbt_get_all(gotp, &irec); + if (bno >= irec.br_startoff + irec.br_blockcount || + bno < irec.br_startoff) + return false; + + trace_xfs_reflink_find_cow_mapping(ip, offset, 1, XFS_IO_OVERWRITE, + &irec); + + /* If it's still delalloc, we must allocate later. */ + *imap = irec; + *need_alloc = !!(isnullstartblock(irec.br_startblock)); + + return true; +} + +/* + * Trim an extent to end at the next CoW reservation past offset_fsb. + */ +int +xfs_reflink_trim_irec_to_next_cow( + struct xfs_inode *ip, + xfs_fileoff_t offset_fsb, + struct xfs_bmbt_irec *imap) +{ + struct xfs_bmbt_irec irec; + struct xfs_ifork *ifp; + struct xfs_bmbt_rec_host *gotp; + xfs_extnum_t idx; + + if (!xfs_is_reflink_inode(ip)) + return 0; + + /* Find the extent in the CoW fork. */ + ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK); + gotp = xfs_iext_bno_to_ext(ifp, offset_fsb, &idx); + if (!gotp) + return 0; + xfs_bmbt_get_all(gotp, &irec); + + /* This is the extent before; try sliding up one. */ + if (irec.br_startoff < offset_fsb) { + idx++; + if (idx >= ifp->if_bytes / sizeof(xfs_bmbt_rec_t)) + return 0; + gotp = xfs_iext_get_ext(ifp, idx); + xfs_bmbt_get_all(gotp, &irec); + } + + if (irec.br_startoff >= imap->br_startoff + imap->br_blockcount) + return 0; + + imap->br_blockcount = irec.br_startoff - imap->br_startoff; + trace_xfs_reflink_trim_irec(ip, imap); + + return 0; +} diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h index f824f874234f..11408c0f3415 100644 --- a/fs/xfs/xfs_reflink.h +++ b/fs/xfs/xfs_reflink.h @@ -28,5 +28,9 @@ extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip, extern int xfs_reflink_reserve_cow_range(struct xfs_inode *ip, xfs_off_t offset, xfs_off_t count); +extern bool xfs_reflink_find_cow_mapping(struct xfs_inode *ip, xfs_off_t offset, + struct xfs_bmbt_irec *imap, bool *need_alloc); +extern int xfs_reflink_trim_irec_to_next_cow(struct xfs_inode *ip, + xfs_fileoff_t offset_fsb, struct xfs_bmbt_irec *imap); #endif /* __XFS_REFLINK_H */ -- cgit v1.2.3-59-g8ed1b From 4862cfe825c0087c14452b362e708a35da675f5e Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:35 -0700 Subject: xfs: support removing extents from CoW fork Create a helper method to remove extents from the CoW fork without any of the side effects (rmapbt/bmbt updates) of the regular extent deletion routine. We'll eventually use this to clear out the CoW fork during ioend processing. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_bmap.c | 170 +++++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_bmap.h | 1 + 2 files changed, 171 insertions(+) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index e88cdb6c75e9..8758000d82d2 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -4908,6 +4908,7 @@ xfs_bmap_del_extent( /* * Matches the whole extent. Delete the entry. */ + trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); xfs_iext_remove(ip, *idx, 1, whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0); --*idx; @@ -5124,6 +5125,175 @@ done: return error; } +/* Remove an extent from the CoW fork. Similar to xfs_bmap_del_extent. */ +int +xfs_bunmapi_cow( + struct xfs_inode *ip, + struct xfs_bmbt_irec *del) +{ + xfs_filblks_t da_new; + xfs_filblks_t da_old; + xfs_fsblock_t del_endblock = 0; + xfs_fileoff_t del_endoff; + int delay; + struct xfs_bmbt_rec_host *ep; + int error; + struct xfs_bmbt_irec got; + xfs_fileoff_t got_endoff; + struct xfs_ifork *ifp; + struct xfs_mount *mp; + xfs_filblks_t nblks; + struct xfs_bmbt_irec new; + /* REFERENCED */ + uint qfield; + xfs_filblks_t temp; + xfs_filblks_t temp2; + int state = BMAP_COWFORK; + int eof; + xfs_extnum_t eidx; + + mp = ip->i_mount; + XFS_STATS_INC(mp, xs_del_exlist); + + ep = xfs_bmap_search_extents(ip, del->br_startoff, XFS_COW_FORK, &eof, + &eidx, &got, &new); + + ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK); ifp = ifp; + ASSERT((eidx >= 0) && (eidx < ifp->if_bytes / + (uint)sizeof(xfs_bmbt_rec_t))); + ASSERT(del->br_blockcount > 0); + ASSERT(got.br_startoff <= del->br_startoff); + del_endoff = del->br_startoff + del->br_blockcount; + got_endoff = got.br_startoff + got.br_blockcount; + ASSERT(got_endoff >= del_endoff); + delay = isnullstartblock(got.br_startblock); + ASSERT(isnullstartblock(del->br_startblock) == delay); + qfield = 0; + error = 0; + /* + * If deleting a real allocation, must free up the disk space. + */ + if (!delay) { + nblks = del->br_blockcount; + qfield = XFS_TRANS_DQ_BCOUNT; + /* + * Set up del_endblock and cur for later. + */ + del_endblock = del->br_startblock + del->br_blockcount; + da_old = da_new = 0; + } else { + da_old = startblockval(got.br_startblock); + da_new = 0; + nblks = 0; + } + qfield = qfield; + nblks = nblks; + + /* + * Set flag value to use in switch statement. + * Left-contig is 2, right-contig is 1. + */ + switch (((got.br_startoff == del->br_startoff) << 1) | + (got_endoff == del_endoff)) { + case 3: + /* + * Matches the whole extent. Delete the entry. + */ + xfs_iext_remove(ip, eidx, 1, BMAP_COWFORK); + --eidx; + break; + + case 2: + /* + * Deleting the first part of the extent. + */ + trace_xfs_bmap_pre_update(ip, eidx, state, _THIS_IP_); + xfs_bmbt_set_startoff(ep, del_endoff); + temp = got.br_blockcount - del->br_blockcount; + xfs_bmbt_set_blockcount(ep, temp); + if (delay) { + temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp), + da_old); + xfs_bmbt_set_startblock(ep, nullstartblock((int)temp)); + trace_xfs_bmap_post_update(ip, eidx, state, _THIS_IP_); + da_new = temp; + break; + } + xfs_bmbt_set_startblock(ep, del_endblock); + trace_xfs_bmap_post_update(ip, eidx, state, _THIS_IP_); + break; + + case 1: + /* + * Deleting the last part of the extent. + */ + temp = got.br_blockcount - del->br_blockcount; + trace_xfs_bmap_pre_update(ip, eidx, state, _THIS_IP_); + xfs_bmbt_set_blockcount(ep, temp); + if (delay) { + temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp), + da_old); + xfs_bmbt_set_startblock(ep, nullstartblock((int)temp)); + trace_xfs_bmap_post_update(ip, eidx, state, _THIS_IP_); + da_new = temp; + break; + } + trace_xfs_bmap_post_update(ip, eidx, state, _THIS_IP_); + break; + + case 0: + /* + * Deleting the middle of the extent. + */ + temp = del->br_startoff - got.br_startoff; + trace_xfs_bmap_pre_update(ip, eidx, state, _THIS_IP_); + xfs_bmbt_set_blockcount(ep, temp); + new.br_startoff = del_endoff; + temp2 = got_endoff - del_endoff; + new.br_blockcount = temp2; + new.br_state = got.br_state; + if (!delay) { + new.br_startblock = del_endblock; + } else { + temp = xfs_bmap_worst_indlen(ip, temp); + xfs_bmbt_set_startblock(ep, nullstartblock((int)temp)); + temp2 = xfs_bmap_worst_indlen(ip, temp2); + new.br_startblock = nullstartblock((int)temp2); + da_new = temp + temp2; + while (da_new > da_old) { + if (temp) { + temp--; + da_new--; + xfs_bmbt_set_startblock(ep, + nullstartblock((int)temp)); + } + if (da_new == da_old) + break; + if (temp2) { + temp2--; + da_new--; + new.br_startblock = + nullstartblock((int)temp2); + } + } + } + trace_xfs_bmap_post_update(ip, eidx, state, _THIS_IP_); + xfs_iext_insert(ip, eidx + 1, 1, &new, state); + ++eidx; + break; + } + + /* + * Account for change in delayed indirect blocks. + * Nothing to do for disk quota accounting here. + */ + ASSERT(da_old >= da_new); + if (da_old > da_new) + xfs_mod_fdblocks(mp, (int64_t)(da_old - da_new), false); + + return error; +} + /* * Unmap (remove) blocks from a file. * If nexts is nonzero then the number of extents to remove is limited to diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index c6fd52f40855..f97db7132564 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -221,6 +221,7 @@ int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, xfs_fileoff_t bno, xfs_filblks_t len, int flags, xfs_extnum_t nexts, xfs_fsblock_t *firstblock, struct xfs_defer_ops *dfops, int *done); +int xfs_bunmapi_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *del); int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx, xfs_extnum_t num); uint xfs_default_attroffset(struct xfs_inode *ip); -- cgit v1.2.3-59-g8ed1b From 43caeb187deb92b3cc343fce9c2310512f6ac9cd Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:35 -0700 Subject: xfs: move mappings from cow fork to data fork after copy-write After the write component of a copy-write operation finishes, clean up the bookkeeping left behind. On error, we simply free the new blocks and pass the error up. If we succeed, however, then we must remove the old data fork mapping and move the cow fork mapping to the data fork. Signed-off-by: Darrick J. Wong [hch: Call the CoW failure function during xfs_cancel_ioend] Signed-off-by: Christoph Hellwig --- fs/xfs/xfs_aops.c | 24 ++++- fs/xfs/xfs_reflink.c | 242 +++++++++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_reflink.h | 8 ++ 3 files changed, 272 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index c76d7a603338..f6f5bbc39dda 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -287,6 +287,25 @@ xfs_end_io( if (XFS_FORCED_SHUTDOWN(ip->i_mount)) error = -EIO; + /* + * For a CoW extent, we need to move the mapping from the CoW fork + * to the data fork. If instead an error happened, just dump the + * new blocks. + */ + if (ioend->io_type == XFS_IO_COW) { + if (error) + goto done; + if (ioend->io_bio->bi_error) { + error = xfs_reflink_cancel_cow_range(ip, + ioend->io_offset, ioend->io_size); + goto done; + } + error = xfs_reflink_end_cow(ip, ioend->io_offset, + ioend->io_size); + if (error) + goto done; + } + /* * For unwritten extents we need to issue transactions to convert a * range to normal written extens after the data I/O has finished. @@ -302,7 +321,8 @@ xfs_end_io( } else if (ioend->io_append_trans) { error = xfs_setfilesize_ioend(ioend, error); } else { - ASSERT(!xfs_ioend_is_append(ioend)); + ASSERT(!xfs_ioend_is_append(ioend) || + ioend->io_type == XFS_IO_COW); } done: @@ -316,7 +336,7 @@ xfs_end_bio( struct xfs_ioend *ioend = bio->bi_private; struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount; - if (ioend->io_type == XFS_IO_UNWRITTEN) + if (ioend->io_type == XFS_IO_UNWRITTEN || ioend->io_type == XFS_IO_COW) queue_work(mp->m_unwritten_workqueue, &ioend->io_work); else if (ioend->io_append_trans) queue_work(mp->m_data_workqueue, &ioend->io_work); diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index d953df3a201c..8c3211ce1215 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -52,6 +52,7 @@ #include "xfs_bmap_btree.h" #include "xfs_reflink.h" #include "xfs_iomap.h" +#include "xfs_rmap_btree.h" /* * Copy on Write of Shared Blocks @@ -412,3 +413,244 @@ xfs_reflink_trim_irec_to_next_cow( return 0; } + +/* + * Cancel all pending CoW reservations for some block range of an inode. + */ +int +xfs_reflink_cancel_cow_blocks( + struct xfs_inode *ip, + struct xfs_trans **tpp, + xfs_fileoff_t offset_fsb, + xfs_fileoff_t end_fsb) +{ + struct xfs_bmbt_irec irec; + xfs_filblks_t count_fsb; + xfs_fsblock_t firstfsb; + struct xfs_defer_ops dfops; + int error = 0; + int nimaps; + + if (!xfs_is_reflink_inode(ip)) + return 0; + + /* Go find the old extent in the CoW fork. */ + while (offset_fsb < end_fsb) { + nimaps = 1; + count_fsb = (xfs_filblks_t)(end_fsb - offset_fsb); + error = xfs_bmapi_read(ip, offset_fsb, count_fsb, &irec, + &nimaps, XFS_BMAPI_COWFORK); + if (error) + break; + ASSERT(nimaps == 1); + + trace_xfs_reflink_cancel_cow(ip, &irec); + + if (irec.br_startblock == DELAYSTARTBLOCK) { + /* Free a delayed allocation. */ + xfs_mod_fdblocks(ip->i_mount, irec.br_blockcount, + false); + ip->i_delayed_blks -= irec.br_blockcount; + + /* Remove the mapping from the CoW fork. */ + error = xfs_bunmapi_cow(ip, &irec); + if (error) + break; + } else if (irec.br_startblock == HOLESTARTBLOCK) { + /* empty */ + } else { + xfs_trans_ijoin(*tpp, ip, 0); + xfs_defer_init(&dfops, &firstfsb); + + xfs_bmap_add_free(ip->i_mount, &dfops, + irec.br_startblock, irec.br_blockcount, + NULL); + + /* Update quota accounting */ + xfs_trans_mod_dquot_byino(*tpp, ip, XFS_TRANS_DQ_BCOUNT, + -(long)irec.br_blockcount); + + /* Roll the transaction */ + error = xfs_defer_finish(tpp, &dfops, ip); + if (error) { + xfs_defer_cancel(&dfops); + break; + } + + /* Remove the mapping from the CoW fork. */ + error = xfs_bunmapi_cow(ip, &irec); + if (error) + break; + } + + /* Roll on... */ + offset_fsb = irec.br_startoff + irec.br_blockcount; + } + + return error; +} + +/* + * Cancel all pending CoW reservations for some byte range of an inode. + */ +int +xfs_reflink_cancel_cow_range( + struct xfs_inode *ip, + xfs_off_t offset, + xfs_off_t count) +{ + struct xfs_trans *tp; + xfs_fileoff_t offset_fsb; + xfs_fileoff_t end_fsb; + int error; + + trace_xfs_reflink_cancel_cow_range(ip, offset, count); + + offset_fsb = XFS_B_TO_FSBT(ip->i_mount, offset); + if (count == NULLFILEOFF) + end_fsb = NULLFILEOFF; + else + end_fsb = XFS_B_TO_FSB(ip->i_mount, offset + count); + + /* Start a rolling transaction to remove the mappings */ + error = xfs_trans_alloc(ip->i_mount, &M_RES(ip->i_mount)->tr_write, + 0, 0, 0, &tp); + if (error) + goto out; + + xfs_ilock(ip, XFS_ILOCK_EXCL); + xfs_trans_ijoin(tp, ip, 0); + + /* Scrape out the old CoW reservations */ + error = xfs_reflink_cancel_cow_blocks(ip, &tp, offset_fsb, end_fsb); + if (error) + goto out_cancel; + + error = xfs_trans_commit(tp); + + xfs_iunlock(ip, XFS_ILOCK_EXCL); + return error; + +out_cancel: + xfs_trans_cancel(tp); + xfs_iunlock(ip, XFS_ILOCK_EXCL); +out: + trace_xfs_reflink_cancel_cow_range_error(ip, error, _RET_IP_); + return error; +} + +/* + * Remap parts of a file's data fork after a successful CoW. + */ +int +xfs_reflink_end_cow( + struct xfs_inode *ip, + xfs_off_t offset, + xfs_off_t count) +{ + struct xfs_bmbt_irec irec; + struct xfs_bmbt_irec uirec; + struct xfs_trans *tp; + xfs_fileoff_t offset_fsb; + xfs_fileoff_t end_fsb; + xfs_filblks_t count_fsb; + xfs_fsblock_t firstfsb; + struct xfs_defer_ops dfops; + int error; + unsigned int resblks; + xfs_filblks_t ilen; + xfs_filblks_t rlen; + int nimaps; + + trace_xfs_reflink_end_cow(ip, offset, count); + + offset_fsb = XFS_B_TO_FSBT(ip->i_mount, offset); + end_fsb = XFS_B_TO_FSB(ip->i_mount, offset + count); + count_fsb = (xfs_filblks_t)(end_fsb - offset_fsb); + + /* Start a rolling transaction to switch the mappings */ + resblks = XFS_EXTENTADD_SPACE_RES(ip->i_mount, XFS_DATA_FORK); + error = xfs_trans_alloc(ip->i_mount, &M_RES(ip->i_mount)->tr_write, + resblks, 0, 0, &tp); + if (error) + goto out; + + xfs_ilock(ip, XFS_ILOCK_EXCL); + xfs_trans_ijoin(tp, ip, 0); + + /* Go find the old extent in the CoW fork. */ + while (offset_fsb < end_fsb) { + /* Read extent from the source file */ + nimaps = 1; + count_fsb = (xfs_filblks_t)(end_fsb - offset_fsb); + error = xfs_bmapi_read(ip, offset_fsb, count_fsb, &irec, + &nimaps, XFS_BMAPI_COWFORK); + if (error) + goto out_cancel; + ASSERT(nimaps == 1); + + ASSERT(irec.br_startblock != DELAYSTARTBLOCK); + trace_xfs_reflink_cow_remap(ip, &irec); + + /* + * We can have a hole in the CoW fork if part of a directio + * write is CoW but part of it isn't. + */ + rlen = ilen = irec.br_blockcount; + if (irec.br_startblock == HOLESTARTBLOCK) + goto next_extent; + + /* Unmap the old blocks in the data fork. */ + while (rlen) { + xfs_defer_init(&dfops, &firstfsb); + error = __xfs_bunmapi(tp, ip, irec.br_startoff, + &rlen, 0, 1, &firstfsb, &dfops); + if (error) + goto out_defer; + + /* + * Trim the extent to whatever got unmapped. + * Remember, bunmapi works backwards. + */ + uirec.br_startblock = irec.br_startblock + rlen; + uirec.br_startoff = irec.br_startoff + rlen; + uirec.br_blockcount = irec.br_blockcount - rlen; + irec.br_blockcount = rlen; + trace_xfs_reflink_cow_remap_piece(ip, &uirec); + + /* Map the new blocks into the data fork. */ + error = xfs_bmap_map_extent(tp->t_mountp, &dfops, + ip, &uirec); + if (error) + goto out_defer; + + /* Remove the mapping from the CoW fork. */ + error = xfs_bunmapi_cow(ip, &uirec); + if (error) + goto out_defer; + + error = xfs_defer_finish(&tp, &dfops, ip); + if (error) + goto out_defer; + } + +next_extent: + /* Roll on... */ + offset_fsb = irec.br_startoff + ilen; + } + + error = xfs_trans_commit(tp); + xfs_iunlock(ip, XFS_ILOCK_EXCL); + if (error) + goto out; + return 0; + +out_defer: + xfs_defer_cancel(&dfops); +out_cancel: + xfs_trans_cancel(tp); + xfs_iunlock(ip, XFS_ILOCK_EXCL); +out: + trace_xfs_reflink_end_cow_error(ip, error, _RET_IP_); + return error; +} diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h index 11408c0f3415..bffa4befa534 100644 --- a/fs/xfs/xfs_reflink.h +++ b/fs/xfs/xfs_reflink.h @@ -33,4 +33,12 @@ extern bool xfs_reflink_find_cow_mapping(struct xfs_inode *ip, xfs_off_t offset, extern int xfs_reflink_trim_irec_to_next_cow(struct xfs_inode *ip, xfs_fileoff_t offset_fsb, struct xfs_bmbt_irec *imap); +extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip, + struct xfs_trans **tpp, xfs_fileoff_t offset_fsb, + xfs_fileoff_t end_fsb); +extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset, + xfs_off_t count); +extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset, + xfs_off_t count); + #endif /* __XFS_REFLINK_H */ -- cgit v1.2.3-59-g8ed1b From db1327b16c2b24e28d1e5899bced89db9ae6538e Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:36 -0700 Subject: xfs: report shared extent mappings to userspace correctly Report shared extents through the iomap interface so that FIEMAP flags shared blocks accurately. Have xfs_vm_bmap return zero for reflinked files because the bmap-based swap code requires static block mappings, which is incompatible with copy on write. NOTE: Existing userspace bmap users such as lilo will have the same problem with reflink files. Signed-off-by: Christoph Hellwig Signed-off-by: Darrick J. Wong --- fs/xfs/xfs_aops.c | 11 +++++++++++ fs/xfs/xfs_iomap.c | 12 +++++++++++- 2 files changed, 22 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index f6f5bbc39dda..2f4a15ec9ee9 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -1508,6 +1508,17 @@ xfs_vm_bmap( trace_xfs_vm_bmap(XFS_I(inode)); xfs_ilock(ip, XFS_IOLOCK_SHARED); + + /* + * The swap code (ab-)uses ->bmap to get a block mapping and then + * bypasseѕ the file system for actual I/O. We really can't allow + * that on reflinks inodes, so we have to skip out here. And yes, + * 0 is the magic code for a bmap error.. + */ + if (xfs_is_reflink_inode(ip)) { + xfs_iunlock(ip, XFS_IOLOCK_SHARED); + return 0; + } filemap_write_and_wait(mapping); xfs_iunlock(ip, XFS_IOLOCK_SHARED); return generic_block_bmap(mapping, block, xfs_get_blocks); diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index ad6939df9680..765849ed9b70 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -961,6 +961,7 @@ xfs_file_iomap_begin( struct xfs_mount *mp = ip->i_mount; struct xfs_bmbt_irec imap; xfs_fileoff_t offset_fsb, end_fsb; + bool shared, trimmed; int nimaps = 1, error = 0; unsigned lockmode; @@ -989,7 +990,14 @@ xfs_file_iomap_begin( end_fsb = XFS_B_TO_FSB(mp, offset + length); error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap, - &nimaps, XFS_BMAPI_ENTIRE); + &nimaps, 0); + if (error) { + xfs_iunlock(ip, lockmode); + return error; + } + + /* Trim the mapping to the nearest shared extent boundary. */ + error = xfs_reflink_trim_around_shared(ip, &imap, &shared, &trimmed); if (error) { xfs_iunlock(ip, lockmode); return error; @@ -1028,6 +1036,8 @@ xfs_file_iomap_begin( } xfs_bmbt_to_iomap(ip, iomap, &imap); + if (shared) + iomap->flags |= IOMAP_F_SHARED; return 0; } -- cgit v1.2.3-59-g8ed1b From 0613f16cd20174d701853f1580ad44a9a6791ff2 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:37 -0700 Subject: xfs: implement CoW for directio writes For O_DIRECT writes to shared blocks, we have to CoW them just like we would with buffered writes. For writes that are not block-aligned, just bounce them to the page cache. For block-aligned writes, however, we can do better than that. Use the same mechanisms that we employ for buffered CoW to set up a delalloc reservation, allocate all the blocks at once, issue the writes against the new blocks and use the same ioend functions to remap the blocks after the write. This should be fairly performant. Christoph discovered that xfs_reflink_allocate_cow_range may stumble over invalid entries in the extent array given that it drops the ilock but still expects the index to be stable. Simple fixing it to a new lookup for every iteration still isn't correct given that xfs_bmapi_allocate will trigger a BUG_ON() if hitting a hole, and there is nothing preventing a xfs_bunmapi_cow call removing extents once we dropped the ilock either. This patch duplicates the inner loop of xfs_bmapi_allocate into a helper for xfs_reflink_allocate_cow_range so that it can be done under the same ilock critical section as our CoW fork delayed allocation. The directio CoW warts will be revisited in a later patch. Signed-off-by: Darrick J. Wong Signed-off-by: Christoph Hellwig --- fs/xfs/xfs_aops.c | 90 +++++++++++++++++++++++++++++++++++++++---- fs/xfs/xfs_file.c | 22 ++++++++++- fs/xfs/xfs_reflink.c | 107 +++++++++++++++++++++++++++++++++++++++++++++++++-- fs/xfs/xfs_reflink.h | 2 + fs/xfs/xfs_trace.h | 1 - 5 files changed, 209 insertions(+), 13 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 2f4a15ec9ee9..0e2a931fa725 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -40,6 +40,7 @@ /* flags for direct write completions */ #define XFS_DIO_FLAG_UNWRITTEN (1 << 0) #define XFS_DIO_FLAG_APPEND (1 << 1) +#define XFS_DIO_FLAG_COW (1 << 2) /* * structure owned by writepages passed to individual writepage calls @@ -1190,18 +1191,24 @@ xfs_map_direct( struct inode *inode, struct buffer_head *bh_result, struct xfs_bmbt_irec *imap, - xfs_off_t offset) + xfs_off_t offset, + bool is_cow) { uintptr_t *flags = (uintptr_t *)&bh_result->b_private; xfs_off_t size = bh_result->b_size; trace_xfs_get_blocks_map_direct(XFS_I(inode), offset, size, - ISUNWRITTEN(imap) ? XFS_IO_UNWRITTEN : XFS_IO_OVERWRITE, imap); + ISUNWRITTEN(imap) ? XFS_IO_UNWRITTEN : is_cow ? XFS_IO_COW : + XFS_IO_OVERWRITE, imap); if (ISUNWRITTEN(imap)) { *flags |= XFS_DIO_FLAG_UNWRITTEN; set_buffer_defer_completion(bh_result); - } else if (offset + size > i_size_read(inode) || offset + size < 0) { + } else if (is_cow) { + *flags |= XFS_DIO_FLAG_COW; + set_buffer_defer_completion(bh_result); + } + if (offset + size > i_size_read(inode) || offset + size < 0) { *flags |= XFS_DIO_FLAG_APPEND; set_buffer_defer_completion(bh_result); } @@ -1247,6 +1254,44 @@ xfs_map_trim_size( bh_result->b_size = mapping_size; } +/* Bounce unaligned directio writes to the page cache. */ +static int +xfs_bounce_unaligned_dio_write( + struct xfs_inode *ip, + xfs_fileoff_t offset_fsb, + struct xfs_bmbt_irec *imap) +{ + struct xfs_bmbt_irec irec; + xfs_fileoff_t delta; + bool shared; + bool x; + int error; + + irec = *imap; + if (offset_fsb > irec.br_startoff) { + delta = offset_fsb - irec.br_startoff; + irec.br_blockcount -= delta; + irec.br_startblock += delta; + irec.br_startoff = offset_fsb; + } + error = xfs_reflink_trim_around_shared(ip, &irec, &shared, &x); + if (error) + return error; + + /* + * We're here because we're trying to do a directio write to a + * region that isn't aligned to a filesystem block. If any part + * of the extent is shared, fall back to buffered mode to handle + * the RMW. This is done by returning -EREMCHG ("remote addr + * changed"), which is caught further up the call stack. + */ + if (shared) { + trace_xfs_reflink_bounce_dio_write(ip, imap); + return -EREMCHG; + } + return 0; +} + STATIC int __xfs_get_blocks( struct inode *inode, @@ -1266,6 +1311,8 @@ __xfs_get_blocks( xfs_off_t offset; ssize_t size; int new = 0; + bool is_cow = false; + bool need_alloc = false; BUG_ON(create && !direct); @@ -1291,8 +1338,26 @@ __xfs_get_blocks( end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size); offset_fsb = XFS_B_TO_FSBT(mp, offset); - error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, - &imap, &nimaps, XFS_BMAPI_ENTIRE); + if (create && direct && xfs_is_reflink_inode(ip)) + is_cow = xfs_reflink_find_cow_mapping(ip, offset, &imap, + &need_alloc); + if (!is_cow) { + error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, + &imap, &nimaps, XFS_BMAPI_ENTIRE); + /* + * Truncate an overwrite extent if there's a pending CoW + * reservation before the end of this extent. This + * forces us to come back to get_blocks to take care of + * the CoW. + */ + if (create && direct && nimaps && + imap.br_startblock != HOLESTARTBLOCK && + imap.br_startblock != DELAYSTARTBLOCK && + !ISUNWRITTEN(&imap)) + xfs_reflink_trim_irec_to_next_cow(ip, offset_fsb, + &imap); + } + ASSERT(!need_alloc); if (error) goto out_unlock; @@ -1344,6 +1409,13 @@ __xfs_get_blocks( if (imap.br_startblock != HOLESTARTBLOCK && imap.br_startblock != DELAYSTARTBLOCK && (create || !ISUNWRITTEN(&imap))) { + if (create && direct && !is_cow) { + error = xfs_bounce_unaligned_dio_write(ip, offset_fsb, + &imap); + if (error) + return error; + } + xfs_map_buffer(inode, bh_result, &imap, offset); if (ISUNWRITTEN(&imap)) set_buffer_unwritten(bh_result); @@ -1352,7 +1424,8 @@ __xfs_get_blocks( if (dax_fault) ASSERT(!ISUNWRITTEN(&imap)); else - xfs_map_direct(inode, bh_result, &imap, offset); + xfs_map_direct(inode, bh_result, &imap, offset, + is_cow); } } @@ -1478,7 +1551,10 @@ xfs_end_io_direct_write( trace_xfs_end_io_direct_write_unwritten(ip, offset, size); error = xfs_iomap_write_unwritten(ip, offset, size); - } else if (flags & XFS_DIO_FLAG_APPEND) { + } + if (flags & XFS_DIO_FLAG_COW) + error = xfs_reflink_end_cow(ip, offset, size); + if (flags & XFS_DIO_FLAG_APPEND) { trace_xfs_end_io_direct_write_append(ip, offset, size); error = xfs_setfilesize(ip, offset, size); diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index c68517b0f248..a690af4c105b 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -38,6 +38,7 @@ #include "xfs_icache.h" #include "xfs_pnfs.h" #include "xfs_iomap.h" +#include "xfs_reflink.h" #include #include @@ -673,6 +674,13 @@ xfs_file_dio_aio_write( trace_xfs_file_direct_write(ip, count, iocb->ki_pos); + /* If this is a block-aligned directio CoW, remap immediately. */ + if (xfs_is_reflink_inode(ip) && !unaligned_io) { + ret = xfs_reflink_allocate_cow_range(ip, iocb->ki_pos, count); + if (ret) + goto out; + } + data = *from; ret = __blockdev_direct_IO(iocb, inode, target->bt_bdev, &data, xfs_get_blocks_direct, xfs_end_io_direct_write, @@ -813,10 +821,20 @@ xfs_file_write_iter( if (IS_DAX(inode)) ret = xfs_file_dax_write(iocb, from); - else if (iocb->ki_flags & IOCB_DIRECT) + else if (iocb->ki_flags & IOCB_DIRECT) { + /* + * Allow a directio write to fall back to a buffered + * write *only* in the case that we're doing a reflink + * CoW. In all other directio scenarios we do not + * allow an operation to fall back to buffered mode. + */ ret = xfs_file_dio_aio_write(iocb, from); - else + if (ret == -EREMCHG) + goto buffered; + } else { +buffered: ret = xfs_file_buffered_aio_write(iocb, from); + } if (ret > 0) { XFS_STATS_ADD(ip->i_mount, xs_write_bytes, ret); diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 8c3211ce1215..a30be03395fb 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -229,7 +229,8 @@ static int __xfs_reflink_reserve_cow( struct xfs_inode *ip, xfs_fileoff_t *offset_fsb, - xfs_fileoff_t end_fsb) + xfs_fileoff_t end_fsb, + bool *skipped) { struct xfs_bmbt_irec got, prev, imap; xfs_fileoff_t orig_end_fsb; @@ -262,8 +263,10 @@ __xfs_reflink_reserve_cow( end_fsb = orig_end_fsb = imap.br_startoff + imap.br_blockcount; /* Not shared? Just report the (potentially capped) extent. */ - if (!shared) + if (!shared) { + *skipped = true; goto done; + } /* * Fork all the shared blocks from our write offset until the end of @@ -309,6 +312,7 @@ xfs_reflink_reserve_cow_range( { struct xfs_mount *mp = ip->i_mount; xfs_fileoff_t offset_fsb, end_fsb; + bool skipped = false; int error; trace_xfs_reflink_reserve_cow_range(ip, offset, count); @@ -318,7 +322,8 @@ xfs_reflink_reserve_cow_range( xfs_ilock(ip, XFS_ILOCK_EXCL); while (offset_fsb < end_fsb) { - error = __xfs_reflink_reserve_cow(ip, &offset_fsb, end_fsb); + error = __xfs_reflink_reserve_cow(ip, &offset_fsb, end_fsb, + &skipped); if (error) { trace_xfs_reflink_reserve_cow_range_error(ip, error, _RET_IP_); @@ -330,6 +335,102 @@ xfs_reflink_reserve_cow_range( return error; } +/* Allocate all CoW reservations covering a range of blocks in a file. */ +static int +__xfs_reflink_allocate_cow( + struct xfs_inode *ip, + xfs_fileoff_t *offset_fsb, + xfs_fileoff_t end_fsb) +{ + struct xfs_mount *mp = ip->i_mount; + struct xfs_bmbt_irec imap; + struct xfs_defer_ops dfops; + struct xfs_trans *tp; + xfs_fsblock_t first_block; + xfs_fileoff_t next_fsb; + int nimaps = 1, error; + bool skipped = false; + + xfs_defer_init(&dfops, &first_block); + + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0, 0, + XFS_TRANS_RESERVE, &tp); + if (error) + return error; + + xfs_ilock(ip, XFS_ILOCK_EXCL); + + next_fsb = *offset_fsb; + error = __xfs_reflink_reserve_cow(ip, &next_fsb, end_fsb, &skipped); + if (error) + goto out_trans_cancel; + + if (skipped) { + *offset_fsb = next_fsb; + goto out_trans_cancel; + } + + xfs_trans_ijoin(tp, ip, 0); + error = xfs_bmapi_write(tp, ip, *offset_fsb, next_fsb - *offset_fsb, + XFS_BMAPI_COWFORK, &first_block, + XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK), + &imap, &nimaps, &dfops); + if (error) + goto out_trans_cancel; + + /* We might not have been able to map the whole delalloc extent */ + *offset_fsb = min(*offset_fsb + imap.br_blockcount, next_fsb); + + error = xfs_defer_finish(&tp, &dfops, NULL); + if (error) + goto out_trans_cancel; + + error = xfs_trans_commit(tp); + +out_unlock: + xfs_iunlock(ip, XFS_ILOCK_EXCL); + return error; +out_trans_cancel: + xfs_defer_cancel(&dfops); + xfs_trans_cancel(tp); + goto out_unlock; +} + +/* Allocate all CoW reservations covering a part of a file. */ +int +xfs_reflink_allocate_cow_range( + struct xfs_inode *ip, + xfs_off_t offset, + xfs_off_t count) +{ + struct xfs_mount *mp = ip->i_mount; + xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset); + xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + count); + int error; + + ASSERT(xfs_is_reflink_inode(ip)); + + trace_xfs_reflink_allocate_cow_range(ip, offset, count); + + /* + * Make sure that the dquots are there. + */ + error = xfs_qm_dqattach(ip, 0); + if (error) + return error; + + while (offset_fsb < end_fsb) { + error = __xfs_reflink_allocate_cow(ip, &offset_fsb, end_fsb); + if (error) { + trace_xfs_reflink_allocate_cow_range_error(ip, error, + _RET_IP_); + break; + } + } + + return error; +} + /* * Find the CoW reservation (and whether or not it needs block allocation) * for a given byte offset of a file. diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h index bffa4befa534..c0c989ae84bc 100644 --- a/fs/xfs/xfs_reflink.h +++ b/fs/xfs/xfs_reflink.h @@ -28,6 +28,8 @@ extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip, extern int xfs_reflink_reserve_cow_range(struct xfs_inode *ip, xfs_off_t offset, xfs_off_t count); +extern int xfs_reflink_allocate_cow_range(struct xfs_inode *ip, + xfs_off_t offset, xfs_off_t count); extern bool xfs_reflink_find_cow_mapping(struct xfs_inode *ip, xfs_off_t offset, struct xfs_bmbt_irec *imap, bool *need_alloc); extern int xfs_reflink_trim_irec_to_next_cow(struct xfs_inode *ip, diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index adfb43d0e108..6a9ae9eaec7f 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -3335,7 +3335,6 @@ DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_enospc); DEFINE_RW_EVENT(xfs_reflink_reserve_cow_range); DEFINE_RW_EVENT(xfs_reflink_allocate_cow_range); -DEFINE_INODE_IREC_EVENT(xfs_reflink_allocate_cow_extent); DEFINE_INODE_IREC_EVENT(xfs_reflink_bounce_dio_write); DEFINE_IOMAP_EVENT(xfs_reflink_find_cow_mapping); -- cgit v1.2.3-59-g8ed1b From aa8968f227a8c6c7468c9d498daf06f8dbc30af0 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:38 -0700 Subject: xfs: cancel CoW reservations and clear inode reflink flag when freeing blocks When we're freeing blocks (truncate, punch, etc.), clear all CoW reservations in the range being freed. If the file block count drops to zero, also clear the inode reflink flag. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_inode.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'fs') diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index edb453d531e1..f072f48b3c04 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -49,6 +49,7 @@ #include "xfs_trans_priv.h" #include "xfs_log.h" #include "xfs_bmap_btree.h" +#include "xfs_reflink.h" kmem_zone_t *xfs_inode_zone; @@ -1586,6 +1587,18 @@ xfs_itruncate_extents( goto out; } + /* Remove all pending CoW reservations. */ + error = xfs_reflink_cancel_cow_blocks(ip, &tp, first_unmap_block, + last_block); + if (error) + goto out; + + /* + * Clear the reflink flag if we truncated everything. + */ + if (ip->i_d.di_nblocks == 0 && xfs_is_reflink_inode(ip)) + ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK; + /* * Always re-log the inode so that our permanent transaction can keep * on rolling it forward in the log. -- cgit v1.2.3-59-g8ed1b From 5e7e605c4d1b5229c7df8a71798df00a4300428b Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:38 -0700 Subject: xfs: cancel pending CoW reservations when destroying inodes When destroying the inode, cancel all pending reservations in the CoW fork so that all the reserved blocks go back to the free pile. In theory this sort of cleanup is only needed to clean up after write errors. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_super.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'fs') diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 35c04a790754..b65b97997f99 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -49,6 +49,7 @@ #include "xfs_rmap_item.h" #include "xfs_refcount_item.h" #include "xfs_bmap_item.h" +#include "xfs_reflink.h" #include #include @@ -938,6 +939,7 @@ xfs_fs_destroy_inode( struct inode *inode) { struct xfs_inode *ip = XFS_I(inode); + int error; trace_xfs_destroy_inode(ip); @@ -945,6 +947,12 @@ xfs_fs_destroy_inode( XFS_STATS_INC(ip->i_mount, vn_rele); XFS_STATS_INC(ip->i_mount, vn_remove); + error = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF); + if (error && !XFS_FORCED_SHUTDOWN(ip->i_mount)) + xfs_warn(ip->i_mount, "Error %d while evicting CoW blocks " + "for inode %llu.", + error, ip->i_ino); + xfs_inactive(ip); ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0); -- cgit v1.2.3-59-g8ed1b From 174edb0e46e520230791a1a894397b7c824cefc4 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:39 -0700 Subject: xfs: store in-progress CoW allocations in the refcount btree Due to the way the CoW algorithm in XFS works, there's an interval during which blocks allocated to handle a CoW can be lost -- if the FS goes down after the blocks are allocated but before the block remapping takes place. This is exacerbated by the cowextsz hint -- allocated reservations can sit around for a while, waiting to get used. Since the refcount btree doesn't normally store records with refcount of 1, we can use it to record these in-progress extents. In-progress blocks cannot be shared because they're not user-visible, so there shouldn't be any conflicts with other programs. This is a better solution than holding EFIs during writeback because (a) EFIs can't be relogged currently, (b) even if they could, EFIs are bound by available log space, which puts an unnecessary upper bound on how much CoW we can have in flight, and (c) we already have a mechanism to track blocks. At mount time, read the refcount records and free anything we find with a refcount of 1 because those were in-progress when the FS went down. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_bmap.c | 11 ++ fs/xfs/libxfs/xfs_format.h | 14 +- fs/xfs/libxfs/xfs_refcount.c | 453 ++++++++++++++++++++++++++++++++++++++++++- fs/xfs/libxfs/xfs_refcount.h | 9 + fs/xfs/xfs_mount.c | 12 ++ fs/xfs/xfs_refcount_item.c | 12 ++ fs/xfs/xfs_reflink.c | 37 ++++ fs/xfs/xfs_reflink.h | 1 + fs/xfs/xfs_super.c | 9 + fs/xfs/xfs_trace.h | 4 + 10 files changed, 551 insertions(+), 11 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 8758000d82d2..e4bf2c406e3b 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -4631,6 +4631,17 @@ xfs_bmapi_write( goto error0; if (bma.blkno == NULLFSBLOCK) break; + + /* + * If this is a CoW allocation, record the data in + * the refcount btree for orphan recovery. + */ + if (whichfork == XFS_COW_FORK) { + error = xfs_refcount_alloc_cow_extent(mp, dfops, + bma.blkno, bma.length); + if (error) + goto error0; + } } /* Deal with the allocated space we found. */ diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 8b826102dfe3..777fa974a319 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -1375,7 +1375,8 @@ struct xfs_owner_info { #define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */ #define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */ #define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */ -#define XFS_RMAP_OWN_MIN (-9ULL) /* guard */ +#define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */ +#define XFS_RMAP_OWN_MIN (-10ULL) /* guard */ #define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63))) @@ -1477,6 +1478,17 @@ unsigned int xfs_refc_block(struct xfs_mount *mp); * data) are not tracked here. Free space is also not tracked here. * This is consistent with pre-reflink XFS. */ + +/* + * Extents that are being used to stage a copy on write are stored + * in the refcount btree with a refcount of 1 and the upper bit set + * on the startblock. This speeds up mount time deletion of stale + * staging extents because they're all at the right side of the tree. + */ +#define XFS_REFC_COW_START ((xfs_agblock_t)(1U << 31)) +#define REFCNTBT_COWFLAG_BITLEN 1 +#define REFCNTBT_AGBLOCK_BITLEN 31 + struct xfs_refcount_rec { __be32 rc_startblock; /* starting block number */ __be32 rc_blockcount; /* count of blocks */ diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c index ab8c30d2a605..56bfef116423 100644 --- a/fs/xfs/libxfs/xfs_refcount.c +++ b/fs/xfs/libxfs/xfs_refcount.c @@ -36,13 +36,23 @@ #include "xfs_trans.h" #include "xfs_bit.h" #include "xfs_refcount.h" +#include "xfs_rmap.h" /* Allowable refcount adjustment amounts. */ enum xfs_refc_adjust_op { XFS_REFCOUNT_ADJUST_INCREASE = 1, XFS_REFCOUNT_ADJUST_DECREASE = -1, + XFS_REFCOUNT_ADJUST_COW_ALLOC = 0, + XFS_REFCOUNT_ADJUST_COW_FREE = -1, }; +STATIC int __xfs_refcount_cow_alloc(struct xfs_btree_cur *rcur, + xfs_agblock_t agbno, xfs_extlen_t aglen, + struct xfs_defer_ops *dfops); +STATIC int __xfs_refcount_cow_free(struct xfs_btree_cur *rcur, + xfs_agblock_t agbno, xfs_extlen_t aglen, + struct xfs_defer_ops *dfops); + /* * Look up the first record less than or equal to [bno, len] in the btree * given by cur. @@ -77,6 +87,17 @@ xfs_refcount_lookup_ge( return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat); } +/* Convert on-disk record to in-core format. */ +static inline void +xfs_refcount_btrec_to_irec( + union xfs_btree_rec *rec, + struct xfs_refcount_irec *irec) +{ + irec->rc_startblock = be32_to_cpu(rec->refc.rc_startblock); + irec->rc_blockcount = be32_to_cpu(rec->refc.rc_blockcount); + irec->rc_refcount = be32_to_cpu(rec->refc.rc_refcount); +} + /* * Get the data from the pointed-to record. */ @@ -86,14 +107,12 @@ xfs_refcount_get_rec( struct xfs_refcount_irec *irec, int *stat) { - union xfs_btree_rec *rec; - int error; + union xfs_btree_rec *rec; + int error; error = xfs_btree_get_rec(cur, &rec, stat); if (!error && *stat == 1) { - irec->rc_startblock = be32_to_cpu(rec->refc.rc_startblock); - irec->rc_blockcount = be32_to_cpu(rec->refc.rc_blockcount); - irec->rc_refcount = be32_to_cpu(rec->refc.rc_refcount); + xfs_refcount_btrec_to_irec(rec, irec); trace_xfs_refcount_get(cur->bc_mp, cur->bc_private.a.agno, irec); } @@ -501,6 +520,8 @@ out_error: return error; } +#define XFS_FIND_RCEXT_SHARED 1 +#define XFS_FIND_RCEXT_COW 2 /* * Find the left extent and the one after it (cleft). This function assumes * that we've already split any extent crossing agbno. @@ -511,7 +532,8 @@ xfs_refcount_find_left_extents( struct xfs_refcount_irec *left, struct xfs_refcount_irec *cleft, xfs_agblock_t agbno, - xfs_extlen_t aglen) + xfs_extlen_t aglen, + int flags) { struct xfs_refcount_irec tmp; int error; @@ -531,6 +553,10 @@ xfs_refcount_find_left_extents( if (xfs_refc_next(&tmp) != agbno) return 0; + if ((flags & XFS_FIND_RCEXT_SHARED) && tmp.rc_refcount < 2) + return 0; + if ((flags & XFS_FIND_RCEXT_COW) && tmp.rc_refcount > 1) + return 0; /* We have a left extent; retrieve (or invent) the next right one */ *left = tmp; @@ -590,7 +616,8 @@ xfs_refcount_find_right_extents( struct xfs_refcount_irec *right, struct xfs_refcount_irec *cright, xfs_agblock_t agbno, - xfs_extlen_t aglen) + xfs_extlen_t aglen, + int flags) { struct xfs_refcount_irec tmp; int error; @@ -610,6 +637,10 @@ xfs_refcount_find_right_extents( if (tmp.rc_startblock != agbno + aglen) return 0; + if ((flags & XFS_FIND_RCEXT_SHARED) && tmp.rc_refcount < 2) + return 0; + if ((flags & XFS_FIND_RCEXT_COW) && tmp.rc_refcount > 1) + return 0; /* We have a right extent; retrieve (or invent) the next left one */ *right = tmp; @@ -676,6 +707,7 @@ xfs_refcount_merge_extents( xfs_agblock_t *agbno, xfs_extlen_t *aglen, enum xfs_refc_adjust_op adjust, + int flags, bool *shape_changed) { struct xfs_refcount_irec left = {0}, cleft = {0}; @@ -691,11 +723,11 @@ xfs_refcount_merge_extents( * [right]. */ error = xfs_refcount_find_left_extents(cur, &left, &cleft, *agbno, - *aglen); + *aglen, flags); if (error) return error; error = xfs_refcount_find_right_extents(cur, &right, &cright, *agbno, - *aglen); + *aglen, flags); if (error) return error; @@ -968,7 +1000,7 @@ xfs_refcount_adjust( * Try to merge with the left or right extents of the range. */ error = xfs_refcount_merge_extents(cur, new_agbno, new_aglen, adj, - &shape_changed); + XFS_FIND_RCEXT_SHARED, &shape_changed); if (error) goto out_error; if (shape_changed) @@ -1089,6 +1121,16 @@ xfs_refcount_finish_one( new_len, XFS_REFCOUNT_ADJUST_DECREASE, dfops, NULL); *new_fsb = XFS_AGB_TO_FSB(mp, agno, new_agbno); break; + case XFS_REFCOUNT_ALLOC_COW: + *new_fsb = startblock + blockcount; + *new_len = 0; + error = __xfs_refcount_cow_alloc(rcur, bno, blockcount, dfops); + break; + case XFS_REFCOUNT_FREE_COW: + *new_fsb = startblock + blockcount; + *new_len = 0; + error = __xfs_refcount_cow_free(rcur, bno, blockcount, dfops); + break; default: ASSERT(0); error = -EFSCORRUPTED; @@ -1265,3 +1307,394 @@ out_error: cur->bc_private.a.agno, error, _RET_IP_); return error; } + +/* + * Recovering CoW Blocks After a Crash + * + * Due to the way that the copy on write mechanism works, there's a window of + * opportunity in which we can lose track of allocated blocks during a crash. + * Because CoW uses delayed allocation in the in-core CoW fork, writeback + * causes blocks to be allocated and stored in the CoW fork. The blocks are + * no longer in the free space btree but are not otherwise recorded anywhere + * until the write completes and the blocks are mapped into the file. A crash + * in between allocation and remapping results in the replacement blocks being + * lost. This situation is exacerbated by the CoW extent size hint because + * allocations can hang around for long time. + * + * However, there is a place where we can record these allocations before they + * become mappings -- the reference count btree. The btree does not record + * extents with refcount == 1, so we can record allocations with a refcount of + * 1. Blocks being used for CoW writeout cannot be shared, so there should be + * no conflict with shared block records. These mappings should be created + * when we allocate blocks to the CoW fork and deleted when they're removed + * from the CoW fork. + * + * Minor nit: records for in-progress CoW allocations and records for shared + * extents must never be merged, to preserve the property that (except for CoW + * allocations) there are no refcount btree entries with refcount == 1. The + * only time this could potentially happen is when unsharing a block that's + * adjacent to CoW allocations, so we must be careful to avoid this. + * + * At mount time we recover lost CoW allocations by searching the refcount + * btree for these refcount == 1 mappings. These represent CoW allocations + * that were in progress at the time the filesystem went down, so we can free + * them to get the space back. + * + * This mechanism is superior to creating EFIs for unmapped CoW extents for + * several reasons -- first, EFIs pin the tail of the log and would have to be + * periodically relogged to avoid filling up the log. Second, CoW completions + * will have to file an EFD and create new EFIs for whatever remains in the + * CoW fork; this partially takes care of (1) but extent-size reservations + * will have to periodically relog even if there's no writeout in progress. + * This can happen if the CoW extent size hint is set, which you really want. + * Third, EFIs cannot currently be automatically relogged into newer + * transactions to advance the log tail. Fourth, stuffing the log full of + * EFIs places an upper bound on the number of CoW allocations that can be + * held filesystem-wide at any given time. Recording them in the refcount + * btree doesn't require us to maintain any state in memory and doesn't pin + * the log. + */ +/* + * Adjust the refcounts of CoW allocations. These allocations are "magic" + * in that they're not referenced anywhere else in the filesystem, so we + * stash them in the refcount btree with a refcount of 1 until either file + * remapping (or CoW cancellation) happens. + */ +STATIC int +xfs_refcount_adjust_cow_extents( + struct xfs_btree_cur *cur, + xfs_agblock_t agbno, + xfs_extlen_t aglen, + enum xfs_refc_adjust_op adj, + struct xfs_defer_ops *dfops, + struct xfs_owner_info *oinfo) +{ + struct xfs_refcount_irec ext, tmp; + int error; + int found_rec, found_tmp; + + if (aglen == 0) + return 0; + + /* Find any overlapping refcount records */ + error = xfs_refcount_lookup_ge(cur, agbno, &found_rec); + if (error) + goto out_error; + error = xfs_refcount_get_rec(cur, &ext, &found_rec); + if (error) + goto out_error; + if (!found_rec) { + ext.rc_startblock = cur->bc_mp->m_sb.sb_agblocks + + XFS_REFC_COW_START; + ext.rc_blockcount = 0; + ext.rc_refcount = 0; + } + + switch (adj) { + case XFS_REFCOUNT_ADJUST_COW_ALLOC: + /* Adding a CoW reservation, there should be nothing here. */ + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, + ext.rc_startblock >= agbno + aglen, out_error); + + tmp.rc_startblock = agbno; + tmp.rc_blockcount = aglen; + tmp.rc_refcount = 1; + trace_xfs_refcount_modify_extent(cur->bc_mp, + cur->bc_private.a.agno, &tmp); + + error = xfs_refcount_insert(cur, &tmp, + &found_tmp); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, + found_tmp == 1, out_error); + break; + case XFS_REFCOUNT_ADJUST_COW_FREE: + /* Removing a CoW reservation, there should be one extent. */ + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, + ext.rc_startblock == agbno, out_error); + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, + ext.rc_blockcount == aglen, out_error); + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, + ext.rc_refcount == 1, out_error); + + ext.rc_refcount = 0; + trace_xfs_refcount_modify_extent(cur->bc_mp, + cur->bc_private.a.agno, &ext); + error = xfs_refcount_delete(cur, &found_rec); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, + found_rec == 1, out_error); + break; + default: + ASSERT(0); + } + + return error; +out_error: + trace_xfs_refcount_modify_extent_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + +/* + * Add or remove refcount btree entries for CoW reservations. + */ +STATIC int +xfs_refcount_adjust_cow( + struct xfs_btree_cur *cur, + xfs_agblock_t agbno, + xfs_extlen_t aglen, + enum xfs_refc_adjust_op adj, + struct xfs_defer_ops *dfops) +{ + bool shape_changed; + int error; + + agbno += XFS_REFC_COW_START; + + /* + * Ensure that no rcextents cross the boundary of the adjustment range. + */ + error = xfs_refcount_split_extent(cur, agbno, &shape_changed); + if (error) + goto out_error; + + error = xfs_refcount_split_extent(cur, agbno + aglen, &shape_changed); + if (error) + goto out_error; + + /* + * Try to merge with the left or right extents of the range. + */ + error = xfs_refcount_merge_extents(cur, &agbno, &aglen, adj, + XFS_FIND_RCEXT_COW, &shape_changed); + if (error) + goto out_error; + + /* Now that we've taken care of the ends, adjust the middle extents */ + error = xfs_refcount_adjust_cow_extents(cur, agbno, aglen, adj, + dfops, NULL); + if (error) + goto out_error; + + return 0; + +out_error: + trace_xfs_refcount_adjust_cow_error(cur->bc_mp, cur->bc_private.a.agno, + error, _RET_IP_); + return error; +} + +/* + * Record a CoW allocation in the refcount btree. + */ +STATIC int +__xfs_refcount_cow_alloc( + struct xfs_btree_cur *rcur, + xfs_agblock_t agbno, + xfs_extlen_t aglen, + struct xfs_defer_ops *dfops) +{ + int error; + + trace_xfs_refcount_cow_increase(rcur->bc_mp, rcur->bc_private.a.agno, + agbno, aglen); + + /* Add refcount btree reservation */ + error = xfs_refcount_adjust_cow(rcur, agbno, aglen, + XFS_REFCOUNT_ADJUST_COW_ALLOC, dfops); + if (error) + return error; + + /* Add rmap entry */ + if (xfs_sb_version_hasrmapbt(&rcur->bc_mp->m_sb)) { + error = xfs_rmap_alloc_extent(rcur->bc_mp, dfops, + rcur->bc_private.a.agno, + agbno, aglen, XFS_RMAP_OWN_COW); + if (error) + return error; + } + + return error; +} + +/* + * Remove a CoW allocation from the refcount btree. + */ +STATIC int +__xfs_refcount_cow_free( + struct xfs_btree_cur *rcur, + xfs_agblock_t agbno, + xfs_extlen_t aglen, + struct xfs_defer_ops *dfops) +{ + int error; + + trace_xfs_refcount_cow_decrease(rcur->bc_mp, rcur->bc_private.a.agno, + agbno, aglen); + + /* Remove refcount btree reservation */ + error = xfs_refcount_adjust_cow(rcur, agbno, aglen, + XFS_REFCOUNT_ADJUST_COW_FREE, dfops); + if (error) + return error; + + /* Remove rmap entry */ + if (xfs_sb_version_hasrmapbt(&rcur->bc_mp->m_sb)) { + error = xfs_rmap_free_extent(rcur->bc_mp, dfops, + rcur->bc_private.a.agno, + agbno, aglen, XFS_RMAP_OWN_COW); + if (error) + return error; + } + + return error; +} + +/* Record a CoW staging extent in the refcount btree. */ +int +xfs_refcount_alloc_cow_extent( + struct xfs_mount *mp, + struct xfs_defer_ops *dfops, + xfs_fsblock_t fsb, + xfs_extlen_t len) +{ + if (!xfs_sb_version_hasreflink(&mp->m_sb)) + return 0; + + return __xfs_refcount_add(mp, dfops, XFS_REFCOUNT_ALLOC_COW, + fsb, len); +} + +/* Forget a CoW staging event in the refcount btree. */ +int +xfs_refcount_free_cow_extent( + struct xfs_mount *mp, + struct xfs_defer_ops *dfops, + xfs_fsblock_t fsb, + xfs_extlen_t len) +{ + if (!xfs_sb_version_hasreflink(&mp->m_sb)) + return 0; + + return __xfs_refcount_add(mp, dfops, XFS_REFCOUNT_FREE_COW, + fsb, len); +} + +struct xfs_refcount_recovery { + struct list_head rr_list; + struct xfs_refcount_irec rr_rrec; +}; + +/* Stuff an extent on the recovery list. */ +STATIC int +xfs_refcount_recover_extent( + struct xfs_btree_cur *cur, + union xfs_btree_rec *rec, + void *priv) +{ + struct list_head *debris = priv; + struct xfs_refcount_recovery *rr; + + if (be32_to_cpu(rec->refc.rc_refcount) != 1) + return -EFSCORRUPTED; + + rr = kmem_alloc(sizeof(struct xfs_refcount_recovery), KM_SLEEP); + xfs_refcount_btrec_to_irec(rec, &rr->rr_rrec); + list_add_tail(&rr->rr_list, debris); + + return 0; +} + +/* Find and remove leftover CoW reservations. */ +int +xfs_refcount_recover_cow_leftovers( + struct xfs_mount *mp, + xfs_agnumber_t agno) +{ + struct xfs_trans *tp; + struct xfs_btree_cur *cur; + struct xfs_buf *agbp; + struct xfs_refcount_recovery *rr, *n; + struct list_head debris; + union xfs_btree_irec low; + union xfs_btree_irec high; + struct xfs_defer_ops dfops; + xfs_fsblock_t fsb; + xfs_agblock_t agbno; + int error; + + if (mp->m_sb.sb_agblocks >= XFS_REFC_COW_START) + return -EOPNOTSUPP; + + error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp); + if (error) + return error; + cur = xfs_refcountbt_init_cursor(mp, NULL, agbp, agno, NULL); + + /* Find all the leftover CoW staging extents. */ + INIT_LIST_HEAD(&debris); + memset(&low, 0, sizeof(low)); + memset(&high, 0, sizeof(high)); + low.rc.rc_startblock = XFS_REFC_COW_START; + high.rc.rc_startblock = -1U; + error = xfs_btree_query_range(cur, &low, &high, + xfs_refcount_recover_extent, &debris); + if (error) + goto out_error; + xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR); + xfs_buf_relse(agbp); + + /* Now iterate the list to free the leftovers */ + list_for_each_entry(rr, &debris, rr_list) { + /* Set up transaction. */ + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0, 0, 0, &tp); + if (error) + goto out_free; + + trace_xfs_refcount_recover_extent(mp, agno, &rr->rr_rrec); + + /* Free the orphan record */ + xfs_defer_init(&dfops, &fsb); + agbno = rr->rr_rrec.rc_startblock - XFS_REFC_COW_START; + fsb = XFS_AGB_TO_FSB(mp, agno, agbno); + error = xfs_refcount_free_cow_extent(mp, &dfops, fsb, + rr->rr_rrec.rc_blockcount); + if (error) + goto out_defer; + + /* Free the block. */ + xfs_bmap_add_free(mp, &dfops, fsb, + rr->rr_rrec.rc_blockcount, NULL); + + error = xfs_defer_finish(&tp, &dfops, NULL); + if (error) + goto out_defer; + + error = xfs_trans_commit(tp); + if (error) + goto out_cancel; + } + goto out_free; + +out_defer: + xfs_defer_cancel(&dfops); +out_cancel: + xfs_trans_cancel(tp); + +out_free: + /* Free the leftover list */ + list_for_each_entry_safe(rr, n, &debris, rr_list) { + list_del(&rr->rr_list); + kmem_free(rr); + } + + return error; + +out_error: + xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); + xfs_buf_relse(agbp); + return error; +} diff --git a/fs/xfs/libxfs/xfs_refcount.h b/fs/xfs/libxfs/xfs_refcount.h index adba3ae2b55f..098dc668ab2c 100644 --- a/fs/xfs/libxfs/xfs_refcount.h +++ b/fs/xfs/libxfs/xfs_refcount.h @@ -58,4 +58,13 @@ extern int xfs_refcount_find_shared(struct xfs_btree_cur *cur, xfs_agblock_t agbno, xfs_extlen_t aglen, xfs_agblock_t *fbno, xfs_extlen_t *flen, bool find_end_of_shared); +extern int xfs_refcount_alloc_cow_extent(struct xfs_mount *mp, + struct xfs_defer_ops *dfops, xfs_fsblock_t fsb, + xfs_extlen_t len); +extern int xfs_refcount_free_cow_extent(struct xfs_mount *mp, + struct xfs_defer_ops *dfops, xfs_fsblock_t fsb, + xfs_extlen_t len); +extern int xfs_refcount_recover_cow_leftovers(struct xfs_mount *mp, + xfs_agnumber_t agno); + #endif /* __XFS_REFCOUNT_H__ */ diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c index a78a1164bab3..099c00ecb078 100644 --- a/fs/xfs/xfs_mount.c +++ b/fs/xfs/xfs_mount.c @@ -44,6 +44,7 @@ #include "xfs_sysfs.h" #include "xfs_rmap_btree.h" #include "xfs_refcount_btree.h" +#include "xfs_reflink.h" static DEFINE_MUTEX(xfs_uuid_table_mutex); @@ -985,10 +986,21 @@ xfs_mountfs( if (error) xfs_warn(mp, "Unable to allocate reserve blocks. Continuing without reserve pool."); + + /* Recover any CoW blocks that never got remapped. */ + error = xfs_reflink_recover_cow(mp); + if (error) { + xfs_err(mp, + "Error %d recovering leftover CoW allocations.", error); + xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); + goto out_quota; + } } return 0; + out_quota: + xfs_qm_unmount_quotas(mp); out_rtunmount: xfs_rtunmount_inodes(mp); out_rele_rip: diff --git a/fs/xfs/xfs_refcount_item.c b/fs/xfs/xfs_refcount_item.c index 82153e2a057c..fe86a668a57e 100644 --- a/fs/xfs/xfs_refcount_item.c +++ b/fs/xfs/xfs_refcount_item.c @@ -502,6 +502,18 @@ xfs_cui_recover( error = xfs_refcount_decrease_extent( tp->t_mountp, &dfops, &irec); break; + case XFS_REFCOUNT_ALLOC_COW: + error = xfs_refcount_alloc_cow_extent( + tp->t_mountp, &dfops, + irec.br_startblock, + irec.br_blockcount); + break; + case XFS_REFCOUNT_FREE_COW: + error = xfs_refcount_free_cow_extent( + tp->t_mountp, &dfops, + irec.br_startblock, + irec.br_blockcount); + break; default: ASSERT(0); } diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index a30be03395fb..0aac26208a82 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -40,6 +40,7 @@ #include "xfs_log.h" #include "xfs_icache.h" #include "xfs_pnfs.h" +#include "xfs_btree.h" #include "xfs_refcount_btree.h" #include "xfs_refcount.h" #include "xfs_bmap_btree.h" @@ -563,6 +564,13 @@ xfs_reflink_cancel_cow_blocks( xfs_trans_ijoin(*tpp, ip, 0); xfs_defer_init(&dfops, &firstfsb); + /* Free the CoW orphan record. */ + error = xfs_refcount_free_cow_extent(ip->i_mount, + &dfops, irec.br_startblock, + irec.br_blockcount); + if (error) + break; + xfs_bmap_add_free(ip->i_mount, &dfops, irec.br_startblock, irec.br_blockcount, NULL); @@ -719,6 +727,13 @@ xfs_reflink_end_cow( irec.br_blockcount = rlen; trace_xfs_reflink_cow_remap_piece(ip, &uirec); + /* Free the CoW orphan record. */ + error = xfs_refcount_free_cow_extent(tp->t_mountp, + &dfops, uirec.br_startblock, + uirec.br_blockcount); + if (error) + goto out_defer; + /* Map the new blocks into the data fork. */ error = xfs_bmap_map_extent(tp->t_mountp, &dfops, ip, &uirec); @@ -755,3 +770,25 @@ out: trace_xfs_reflink_end_cow_error(ip, error, _RET_IP_); return error; } + +/* + * Free leftover CoW reservations that didn't get cleaned out. + */ +int +xfs_reflink_recover_cow( + struct xfs_mount *mp) +{ + xfs_agnumber_t agno; + int error = 0; + + if (!xfs_sb_version_hasreflink(&mp->m_sb)) + return 0; + + for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { + error = xfs_refcount_recover_cow_leftovers(mp, agno); + if (error) + break; + } + + return error; +} diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h index c0c989ae84bc..1d2f180f9eca 100644 --- a/fs/xfs/xfs_reflink.h +++ b/fs/xfs/xfs_reflink.h @@ -42,5 +42,6 @@ extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset, xfs_off_t count); extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset, xfs_off_t count); +extern int xfs_reflink_recover_cow(struct xfs_mount *mp); #endif /* __XFS_REFLINK_H */ diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index b65b97997f99..c32e7e61e7f3 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1316,6 +1316,15 @@ xfs_fs_remount( xfs_restore_resvblks(mp); xfs_log_work_queue(mp); xfs_queue_eofblocks(mp); + + /* Recover any CoW blocks that never got remapped. */ + error = xfs_reflink_recover_cow(mp); + if (error) { + xfs_err(mp, + "Error %d recovering leftover CoW allocations.", error); + xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); + return error; + } } /* rw -> ro */ diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 6a9ae9eaec7f..5c10b12170d0 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -2916,14 +2916,18 @@ DEFINE_AG_ERROR_EVENT(xfs_refcount_update_error); /* refcount adjustment tracepoints */ DEFINE_AG_EXTENT_EVENT(xfs_refcount_increase); DEFINE_AG_EXTENT_EVENT(xfs_refcount_decrease); +DEFINE_AG_EXTENT_EVENT(xfs_refcount_cow_increase); +DEFINE_AG_EXTENT_EVENT(xfs_refcount_cow_decrease); DEFINE_REFCOUNT_TRIPLE_EXTENT_EVENT(xfs_refcount_merge_center_extents); DEFINE_REFCOUNT_EXTENT_EVENT(xfs_refcount_modify_extent); +DEFINE_REFCOUNT_EXTENT_EVENT(xfs_refcount_recover_extent); DEFINE_REFCOUNT_EXTENT_AT_EVENT(xfs_refcount_split_extent); DEFINE_REFCOUNT_DOUBLE_EXTENT_EVENT(xfs_refcount_merge_left_extent); DEFINE_REFCOUNT_DOUBLE_EXTENT_EVENT(xfs_refcount_merge_right_extent); DEFINE_REFCOUNT_DOUBLE_EXTENT_AT_EVENT(xfs_refcount_find_left_extent); DEFINE_REFCOUNT_DOUBLE_EXTENT_AT_EVENT(xfs_refcount_find_right_extent); DEFINE_AG_ERROR_EVENT(xfs_refcount_adjust_error); +DEFINE_AG_ERROR_EVENT(xfs_refcount_adjust_cow_error); DEFINE_AG_ERROR_EVENT(xfs_refcount_merge_center_extents_error); DEFINE_AG_ERROR_EVENT(xfs_refcount_modify_extent_error); DEFINE_AG_ERROR_EVENT(xfs_refcount_split_extent_error); -- cgit v1.2.3-59-g8ed1b From 862bb360ef569f625bcf700ae4b162a9c8fa9bba Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:40 -0700 Subject: xfs: reflink extents from one file to another Reflink extents from one file to another; that is to say, iteratively remove the mappings from the destination file, copy the mappings from the source file to the destination file, and increment the reference count of all the blocks that got remapped. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_reflink.c | 428 +++++++++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_reflink.h | 2 + 2 files changed, 430 insertions(+) (limited to 'fs') diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 0aac26208a82..c1e98a43a937 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -792,3 +792,431 @@ xfs_reflink_recover_cow( return error; } + +/* + * Reflinking (Block) Ranges of Two Files Together + * + * First, ensure that the reflink flag is set on both inodes. The flag is an + * optimization to avoid unnecessary refcount btree lookups in the write path. + * + * Now we can iteratively remap the range of extents (and holes) in src to the + * corresponding ranges in dest. Let drange and srange denote the ranges of + * logical blocks in dest and src touched by the reflink operation. + * + * While the length of drange is greater than zero, + * - Read src's bmbt at the start of srange ("imap") + * - If imap doesn't exist, make imap appear to start at the end of srange + * with zero length. + * - If imap starts before srange, advance imap to start at srange. + * - If imap goes beyond srange, truncate imap to end at the end of srange. + * - Punch (imap start - srange start + imap len) blocks from dest at + * offset (drange start). + * - If imap points to a real range of pblks, + * > Increase the refcount of the imap's pblks + * > Map imap's pblks into dest at the offset + * (drange start + imap start - srange start) + * - Advance drange and srange by (imap start - srange start + imap len) + * + * Finally, if the reflink made dest longer, update both the in-core and + * on-disk file sizes. + * + * ASCII Art Demonstration: + * + * Let's say we want to reflink this source file: + * + * ----SSSSSSS-SSSSS----SSSSSS (src file) + * <--------------------> + * + * into this destination file: + * + * --DDDDDDDDDDDDDDDDDDD--DDD (dest file) + * <--------------------> + * '-' means a hole, and 'S' and 'D' are written blocks in the src and dest. + * Observe that the range has different logical offsets in either file. + * + * Consider that the first extent in the source file doesn't line up with our + * reflink range. Unmapping and remapping are separate operations, so we can + * unmap more blocks from the destination file than we remap. + * + * ----SSSSSSS-SSSSS----SSSSSS + * <-------> + * --DDDDD---------DDDDD--DDD + * <-------> + * + * Now remap the source extent into the destination file: + * + * ----SSSSSSS-SSSSS----SSSSSS + * <-------> + * --DDDDD--SSSSSSSDDDDD--DDD + * <-------> + * + * Do likewise with the second hole and extent in our range. Holes in the + * unmap range don't affect our operation. + * + * ----SSSSSSS-SSSSS----SSSSSS + * <----> + * --DDDDD--SSSSSSS-SSSSS-DDD + * <----> + * + * Finally, unmap and remap part of the third extent. This will increase the + * size of the destination file. + * + * ----SSSSSSS-SSSSS----SSSSSS + * <-----> + * --DDDDD--SSSSSSS-SSSSS----SSS + * <-----> + * + * Once we update the destination file's i_size, we're done. + */ + +/* + * Ensure the reflink bit is set in both inodes. + */ +STATIC int +xfs_reflink_set_inode_flag( + struct xfs_inode *src, + struct xfs_inode *dest) +{ + struct xfs_mount *mp = src->i_mount; + int error; + struct xfs_trans *tp; + + if (xfs_is_reflink_inode(src) && xfs_is_reflink_inode(dest)) + return 0; + + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp); + if (error) + goto out_error; + + /* Lock both files against IO */ + if (src->i_ino == dest->i_ino) + xfs_ilock(src, XFS_ILOCK_EXCL); + else + xfs_lock_two_inodes(src, dest, XFS_ILOCK_EXCL); + + if (!xfs_is_reflink_inode(src)) { + trace_xfs_reflink_set_inode_flag(src); + xfs_trans_ijoin(tp, src, XFS_ILOCK_EXCL); + src->i_d.di_flags2 |= XFS_DIFLAG2_REFLINK; + xfs_trans_log_inode(tp, src, XFS_ILOG_CORE); + xfs_ifork_init_cow(src); + } else + xfs_iunlock(src, XFS_ILOCK_EXCL); + + if (src->i_ino == dest->i_ino) + goto commit_flags; + + if (!xfs_is_reflink_inode(dest)) { + trace_xfs_reflink_set_inode_flag(dest); + xfs_trans_ijoin(tp, dest, XFS_ILOCK_EXCL); + dest->i_d.di_flags2 |= XFS_DIFLAG2_REFLINK; + xfs_trans_log_inode(tp, dest, XFS_ILOG_CORE); + xfs_ifork_init_cow(dest); + } else + xfs_iunlock(dest, XFS_ILOCK_EXCL); + +commit_flags: + error = xfs_trans_commit(tp); + if (error) + goto out_error; + return error; + +out_error: + trace_xfs_reflink_set_inode_flag_error(dest, error, _RET_IP_); + return error; +} + +/* + * Update destination inode size, if necessary. + */ +STATIC int +xfs_reflink_update_dest( + struct xfs_inode *dest, + xfs_off_t newlen) +{ + struct xfs_mount *mp = dest->i_mount; + struct xfs_trans *tp; + int error; + + if (newlen <= i_size_read(VFS_I(dest))) + return 0; + + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp); + if (error) + goto out_error; + + xfs_ilock(dest, XFS_ILOCK_EXCL); + xfs_trans_ijoin(tp, dest, XFS_ILOCK_EXCL); + + trace_xfs_reflink_update_inode_size(dest, newlen); + i_size_write(VFS_I(dest), newlen); + dest->i_d.di_size = newlen; + xfs_trans_log_inode(tp, dest, XFS_ILOG_CORE); + + error = xfs_trans_commit(tp); + if (error) + goto out_error; + return error; + +out_error: + trace_xfs_reflink_update_inode_size_error(dest, error, _RET_IP_); + return error; +} + +/* + * Unmap a range of blocks from a file, then map other blocks into the hole. + * The range to unmap is (destoff : destoff + srcioff + irec->br_blockcount). + * The extent irec is mapped into dest at irec->br_startoff. + */ +STATIC int +xfs_reflink_remap_extent( + struct xfs_inode *ip, + struct xfs_bmbt_irec *irec, + xfs_fileoff_t destoff, + xfs_off_t new_isize) +{ + struct xfs_mount *mp = ip->i_mount; + struct xfs_trans *tp; + xfs_fsblock_t firstfsb; + unsigned int resblks; + struct xfs_defer_ops dfops; + struct xfs_bmbt_irec uirec; + bool real_extent; + xfs_filblks_t rlen; + xfs_filblks_t unmap_len; + xfs_off_t newlen; + int error; + + unmap_len = irec->br_startoff + irec->br_blockcount - destoff; + trace_xfs_reflink_punch_range(ip, destoff, unmap_len); + + /* Only remap normal extents. */ + real_extent = (irec->br_startblock != HOLESTARTBLOCK && + irec->br_startblock != DELAYSTARTBLOCK && + !ISUNWRITTEN(irec)); + + /* Start a rolling transaction to switch the mappings */ + resblks = XFS_EXTENTADD_SPACE_RES(ip->i_mount, XFS_DATA_FORK); + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, &tp); + if (error) + goto out; + + xfs_ilock(ip, XFS_ILOCK_EXCL); + xfs_trans_ijoin(tp, ip, 0); + + /* If we're not just clearing space, then do we have enough quota? */ + if (real_extent) { + error = xfs_trans_reserve_quota_nblks(tp, ip, + irec->br_blockcount, 0, XFS_QMOPT_RES_REGBLKS); + if (error) + goto out_cancel; + } + + trace_xfs_reflink_remap(ip, irec->br_startoff, + irec->br_blockcount, irec->br_startblock); + + /* Unmap the old blocks in the data fork. */ + rlen = unmap_len; + while (rlen) { + xfs_defer_init(&dfops, &firstfsb); + error = __xfs_bunmapi(tp, ip, destoff, &rlen, 0, 1, + &firstfsb, &dfops); + if (error) + goto out_defer; + + /* + * Trim the extent to whatever got unmapped. + * Remember, bunmapi works backwards. + */ + uirec.br_startblock = irec->br_startblock + rlen; + uirec.br_startoff = irec->br_startoff + rlen; + uirec.br_blockcount = unmap_len - rlen; + unmap_len = rlen; + + /* If this isn't a real mapping, we're done. */ + if (!real_extent || uirec.br_blockcount == 0) + goto next_extent; + + trace_xfs_reflink_remap(ip, uirec.br_startoff, + uirec.br_blockcount, uirec.br_startblock); + + /* Update the refcount tree */ + error = xfs_refcount_increase_extent(mp, &dfops, &uirec); + if (error) + goto out_defer; + + /* Map the new blocks into the data fork. */ + error = xfs_bmap_map_extent(mp, &dfops, ip, &uirec); + if (error) + goto out_defer; + + /* Update quota accounting. */ + xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, + uirec.br_blockcount); + + /* Update dest isize if needed. */ + newlen = XFS_FSB_TO_B(mp, + uirec.br_startoff + uirec.br_blockcount); + newlen = min_t(xfs_off_t, newlen, new_isize); + if (newlen > i_size_read(VFS_I(ip))) { + trace_xfs_reflink_update_inode_size(ip, newlen); + i_size_write(VFS_I(ip), newlen); + ip->i_d.di_size = newlen; + xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); + } + +next_extent: + /* Process all the deferred stuff. */ + error = xfs_defer_finish(&tp, &dfops, ip); + if (error) + goto out_defer; + } + + error = xfs_trans_commit(tp); + xfs_iunlock(ip, XFS_ILOCK_EXCL); + if (error) + goto out; + return 0; + +out_defer: + xfs_defer_cancel(&dfops); +out_cancel: + xfs_trans_cancel(tp); + xfs_iunlock(ip, XFS_ILOCK_EXCL); +out: + trace_xfs_reflink_remap_extent_error(ip, error, _RET_IP_); + return error; +} + +/* + * Iteratively remap one file's extents (and holes) to another's. + */ +STATIC int +xfs_reflink_remap_blocks( + struct xfs_inode *src, + xfs_fileoff_t srcoff, + struct xfs_inode *dest, + xfs_fileoff_t destoff, + xfs_filblks_t len, + xfs_off_t new_isize) +{ + struct xfs_bmbt_irec imap; + int nimaps; + int error = 0; + xfs_filblks_t range_len; + + /* drange = (destoff, destoff + len); srange = (srcoff, srcoff + len) */ + while (len) { + trace_xfs_reflink_remap_blocks_loop(src, srcoff, len, + dest, destoff); + /* Read extent from the source file */ + nimaps = 1; + xfs_ilock(src, XFS_ILOCK_EXCL); + error = xfs_bmapi_read(src, srcoff, len, &imap, &nimaps, 0); + xfs_iunlock(src, XFS_ILOCK_EXCL); + if (error) + goto err; + ASSERT(nimaps == 1); + + trace_xfs_reflink_remap_imap(src, srcoff, len, XFS_IO_OVERWRITE, + &imap); + + /* Translate imap into the destination file. */ + range_len = imap.br_startoff + imap.br_blockcount - srcoff; + imap.br_startoff += destoff - srcoff; + + /* Clear dest from destoff to the end of imap and map it in. */ + error = xfs_reflink_remap_extent(dest, &imap, destoff, + new_isize); + if (error) + goto err; + + if (fatal_signal_pending(current)) { + error = -EINTR; + goto err; + } + + /* Advance drange/srange */ + srcoff += range_len; + destoff += range_len; + len -= range_len; + } + + return 0; + +err: + trace_xfs_reflink_remap_blocks_error(dest, error, _RET_IP_); + return error; +} + +/* + * Link a range of blocks from one file to another. + */ +int +xfs_reflink_remap_range( + struct xfs_inode *src, + xfs_off_t srcoff, + struct xfs_inode *dest, + xfs_off_t destoff, + xfs_off_t len) +{ + struct xfs_mount *mp = src->i_mount; + xfs_fileoff_t sfsbno, dfsbno; + xfs_filblks_t fsblen; + int error; + + if (!xfs_sb_version_hasreflink(&mp->m_sb)) + return -EOPNOTSUPP; + + if (XFS_FORCED_SHUTDOWN(mp)) + return -EIO; + + /* Don't reflink realtime inodes */ + if (XFS_IS_REALTIME_INODE(src) || XFS_IS_REALTIME_INODE(dest)) + return -EINVAL; + + trace_xfs_reflink_remap_range(src, srcoff, len, dest, destoff); + + /* Lock both files against IO */ + if (src->i_ino == dest->i_ino) { + xfs_ilock(src, XFS_IOLOCK_EXCL); + xfs_ilock(src, XFS_MMAPLOCK_EXCL); + } else { + xfs_lock_two_inodes(src, dest, XFS_IOLOCK_EXCL); + xfs_lock_two_inodes(src, dest, XFS_MMAPLOCK_EXCL); + } + + error = xfs_reflink_set_inode_flag(src, dest); + if (error) + goto out_error; + + /* + * Invalidate the page cache so that we can clear any CoW mappings + * in the destination file. + */ + truncate_inode_pages_range(&VFS_I(dest)->i_data, destoff, + PAGE_ALIGN(destoff + len) - 1); + + dfsbno = XFS_B_TO_FSBT(mp, destoff); + sfsbno = XFS_B_TO_FSBT(mp, srcoff); + fsblen = XFS_B_TO_FSB(mp, len); + error = xfs_reflink_remap_blocks(src, sfsbno, dest, dfsbno, fsblen, + destoff + len); + if (error) + goto out_error; + + error = xfs_reflink_update_dest(dest, destoff + len); + if (error) + goto out_error; + +out_error: + xfs_iunlock(src, XFS_MMAPLOCK_EXCL); + xfs_iunlock(src, XFS_IOLOCK_EXCL); + if (src->i_ino != dest->i_ino) { + xfs_iunlock(dest, XFS_MMAPLOCK_EXCL); + xfs_iunlock(dest, XFS_IOLOCK_EXCL); + } + if (error) + trace_xfs_reflink_remap_range_error(dest, error, _RET_IP_); + return error; +} diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h index 1d2f180f9eca..c35ce299281b 100644 --- a/fs/xfs/xfs_reflink.h +++ b/fs/xfs/xfs_reflink.h @@ -43,5 +43,7 @@ extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset, extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset, xfs_off_t count); extern int xfs_reflink_recover_cow(struct xfs_mount *mp); +extern int xfs_reflink_remap_range(struct xfs_inode *src, xfs_off_t srcoff, + struct xfs_inode *dest, xfs_off_t destoff, xfs_off_t len); #endif /* __XFS_REFLINK_H */ -- cgit v1.2.3-59-g8ed1b From 9fe26045e98f8787999f6aa45aec35d16565c1bd Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:40 -0700 Subject: xfs: add clone file and clone range vfs functions Define two VFS functions which allow userspace to reflink a range of blocks between two files or to reflink one file's contents to another. These functions fit the new VFS ioctls that standardize the checking for the btrfs CLONE and CLONE RANGE ioctls. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_file.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 142 insertions(+) (limited to 'fs') diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index a690af4c105b..cf24b61951e3 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -977,6 +977,146 @@ out_unlock: return error; } +/* + * Flush all file writes out to disk. + */ +static int +xfs_file_wait_for_io( + struct inode *inode, + loff_t offset, + size_t len) +{ + loff_t rounding; + loff_t ioffset; + loff_t iendoffset; + loff_t bs; + int ret; + + bs = inode->i_sb->s_blocksize; + inode_dio_wait(inode); + + rounding = max_t(xfs_off_t, bs, PAGE_SIZE); + ioffset = round_down(offset, rounding); + iendoffset = round_up(offset + len, rounding) - 1; + ret = filemap_write_and_wait_range(inode->i_mapping, ioffset, + iendoffset); + return ret; +} + +/* Hook up to the VFS reflink function */ +STATIC int +xfs_file_share_range( + struct file *file_in, + loff_t pos_in, + struct file *file_out, + loff_t pos_out, + u64 len) +{ + struct inode *inode_in; + struct inode *inode_out; + ssize_t ret; + loff_t bs; + loff_t isize; + int same_inode; + loff_t blen; + + inode_in = file_inode(file_in); + inode_out = file_inode(file_out); + bs = inode_out->i_sb->s_blocksize; + + /* Don't touch certain kinds of inodes */ + if (IS_IMMUTABLE(inode_out)) + return -EPERM; + if (IS_SWAPFILE(inode_in) || + IS_SWAPFILE(inode_out)) + return -ETXTBSY; + + /* Reflink only works within this filesystem. */ + if (inode_in->i_sb != inode_out->i_sb) + return -EXDEV; + same_inode = (inode_in->i_ino == inode_out->i_ino); + + /* Don't reflink dirs, pipes, sockets... */ + if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode)) + return -EISDIR; + if (S_ISFIFO(inode_in->i_mode) || S_ISFIFO(inode_out->i_mode)) + return -EINVAL; + if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) + return -EINVAL; + + /* Are we going all the way to the end? */ + isize = i_size_read(inode_in); + if (isize == 0) + return 0; + if (len == 0) + len = isize - pos_in; + + /* Ensure offsets don't wrap and the input is inside i_size */ + if (pos_in + len < pos_in || pos_out + len < pos_out || + pos_in + len > isize) + return -EINVAL; + + /* If we're linking to EOF, continue to the block boundary. */ + if (pos_in + len == isize) + blen = ALIGN(isize, bs) - pos_in; + else + blen = len; + + /* Only reflink if we're aligned to block boundaries */ + if (!IS_ALIGNED(pos_in, bs) || !IS_ALIGNED(pos_in + blen, bs) || + !IS_ALIGNED(pos_out, bs) || !IS_ALIGNED(pos_out + blen, bs)) + return -EINVAL; + + /* Don't allow overlapped reflink within the same file */ + if (same_inode && pos_out + blen > pos_in && pos_out < pos_in + blen) + return -EINVAL; + + /* Wait for the completion of any pending IOs on srcfile */ + ret = xfs_file_wait_for_io(inode_in, pos_in, len); + if (ret) + goto out_unlock; + ret = xfs_file_wait_for_io(inode_out, pos_out, len); + if (ret) + goto out_unlock; + + ret = xfs_reflink_remap_range(XFS_I(inode_in), pos_in, XFS_I(inode_out), + pos_out, len); + if (ret < 0) + goto out_unlock; + +out_unlock: + return ret; +} + +STATIC ssize_t +xfs_file_copy_range( + struct file *file_in, + loff_t pos_in, + struct file *file_out, + loff_t pos_out, + size_t len, + unsigned int flags) +{ + int error; + + error = xfs_file_share_range(file_in, pos_in, file_out, pos_out, + len); + if (error) + return error; + return len; +} + +STATIC int +xfs_file_clone_range( + struct file *file_in, + loff_t pos_in, + struct file *file_out, + loff_t pos_out, + u64 len) +{ + return xfs_file_share_range(file_in, pos_in, file_out, pos_out, + len); +} STATIC int xfs_file_open( @@ -1637,6 +1777,8 @@ const struct file_operations xfs_file_operations = { .release = xfs_file_release, .fsync = xfs_file_fsync, .fallocate = xfs_file_fallocate, + .copy_file_range = xfs_file_copy_range, + .clone_file_range = xfs_file_clone_range, }; const struct file_operations xfs_dir_file_operations = { -- cgit v1.2.3-59-g8ed1b From cc714660bb8b14dd897cd805bbcd8b76a7606289 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:41 -0700 Subject: xfs: add dedupe range vfs function Define a VFS function which allows userspace to request that the kernel reflink a range of blocks between two files if the ranges' contents match. The function fits the new VFS ioctl that standardizes the checking for the btrfs EXTENT SAME ioctl. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_file.c | 48 +++++++++++++++++-- fs/xfs/xfs_reflink.c | 127 ++++++++++++++++++++++++++++++++++++++++++++++++++- fs/xfs/xfs_reflink.h | 5 +- 3 files changed, 174 insertions(+), 6 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index cf24b61951e3..39fde9f51303 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1010,7 +1010,8 @@ xfs_file_share_range( loff_t pos_in, struct file *file_out, loff_t pos_out, - u64 len) + u64 len, + bool is_dedupe) { struct inode *inode_in; struct inode *inode_out; @@ -1019,6 +1020,7 @@ xfs_file_share_range( loff_t isize; int same_inode; loff_t blen; + unsigned int flags = 0; inode_in = file_inode(file_in); inode_out = file_inode(file_out); @@ -1056,6 +1058,15 @@ xfs_file_share_range( pos_in + len > isize) return -EINVAL; + /* Don't allow dedupe past EOF in the dest file */ + if (is_dedupe) { + loff_t disize; + + disize = i_size_read(inode_out); + if (pos_out >= disize || pos_out + len > disize) + return -EINVAL; + } + /* If we're linking to EOF, continue to the block boundary. */ if (pos_in + len == isize) blen = ALIGN(isize, bs) - pos_in; @@ -1079,8 +1090,10 @@ xfs_file_share_range( if (ret) goto out_unlock; + if (is_dedupe) + flags |= XFS_REFLINK_DEDUPE; ret = xfs_reflink_remap_range(XFS_I(inode_in), pos_in, XFS_I(inode_out), - pos_out, len); + pos_out, len, flags); if (ret < 0) goto out_unlock; @@ -1100,7 +1113,7 @@ xfs_file_copy_range( int error; error = xfs_file_share_range(file_in, pos_in, file_out, pos_out, - len); + len, false); if (error) return error; return len; @@ -1115,7 +1128,33 @@ xfs_file_clone_range( u64 len) { return xfs_file_share_range(file_in, pos_in, file_out, pos_out, - len); + len, false); +} + +#define XFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) +STATIC ssize_t +xfs_file_dedupe_range( + struct file *src_file, + u64 loff, + u64 len, + struct file *dst_file, + u64 dst_loff) +{ + int error; + + /* + * Limit the total length we will dedupe for each operation. + * This is intended to bound the total time spent in this + * ioctl to something sane. + */ + if (len > XFS_MAX_DEDUPE_LEN) + len = XFS_MAX_DEDUPE_LEN; + + error = xfs_file_share_range(src_file, loff, dst_file, dst_loff, + len, true); + if (error) + return error; + return len; } STATIC int @@ -1779,6 +1818,7 @@ const struct file_operations xfs_file_operations = { .fallocate = xfs_file_fallocate, .copy_file_range = xfs_file_copy_range, .clone_file_range = xfs_file_clone_range, + .dedupe_file_range = xfs_file_dedupe_range, }; const struct file_operations xfs_dir_file_operations = { diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index c1e98a43a937..6b22669421b2 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1149,6 +1149,111 @@ err: return error; } +/* + * Read a page's worth of file data into the page cache. Return the page + * locked. + */ +static struct page * +xfs_get_page( + struct inode *inode, + xfs_off_t offset) +{ + struct address_space *mapping; + struct page *page; + pgoff_t n; + + n = offset >> PAGE_SHIFT; + mapping = inode->i_mapping; + page = read_mapping_page(mapping, n, NULL); + if (IS_ERR(page)) + return page; + if (!PageUptodate(page)) { + put_page(page); + return ERR_PTR(-EIO); + } + lock_page(page); + return page; +} + +/* + * Compare extents of two files to see if they are the same. + */ +static int +xfs_compare_extents( + struct inode *src, + xfs_off_t srcoff, + struct inode *dest, + xfs_off_t destoff, + xfs_off_t len, + bool *is_same) +{ + xfs_off_t src_poff; + xfs_off_t dest_poff; + void *src_addr; + void *dest_addr; + struct page *src_page; + struct page *dest_page; + xfs_off_t cmp_len; + bool same; + int error; + + error = -EINVAL; + same = true; + while (len) { + src_poff = srcoff & (PAGE_SIZE - 1); + dest_poff = destoff & (PAGE_SIZE - 1); + cmp_len = min(PAGE_SIZE - src_poff, + PAGE_SIZE - dest_poff); + cmp_len = min(cmp_len, len); + ASSERT(cmp_len > 0); + + trace_xfs_reflink_compare_extents(XFS_I(src), srcoff, cmp_len, + XFS_I(dest), destoff); + + src_page = xfs_get_page(src, srcoff); + if (IS_ERR(src_page)) { + error = PTR_ERR(src_page); + goto out_error; + } + dest_page = xfs_get_page(dest, destoff); + if (IS_ERR(dest_page)) { + error = PTR_ERR(dest_page); + unlock_page(src_page); + put_page(src_page); + goto out_error; + } + src_addr = kmap_atomic(src_page); + dest_addr = kmap_atomic(dest_page); + + flush_dcache_page(src_page); + flush_dcache_page(dest_page); + + if (memcmp(src_addr + src_poff, dest_addr + dest_poff, cmp_len)) + same = false; + + kunmap_atomic(dest_addr); + kunmap_atomic(src_addr); + unlock_page(dest_page); + unlock_page(src_page); + put_page(dest_page); + put_page(src_page); + + if (!same) + break; + + srcoff += cmp_len; + destoff += cmp_len; + len -= cmp_len; + } + + *is_same = same; + return 0; + +out_error: + trace_xfs_reflink_compare_extents_error(XFS_I(dest), error, _RET_IP_); + return error; +} + /* * Link a range of blocks from one file to another. */ @@ -1158,12 +1263,14 @@ xfs_reflink_remap_range( xfs_off_t srcoff, struct xfs_inode *dest, xfs_off_t destoff, - xfs_off_t len) + xfs_off_t len, + unsigned int flags) { struct xfs_mount *mp = src->i_mount; xfs_fileoff_t sfsbno, dfsbno; xfs_filblks_t fsblen; int error; + bool is_same; if (!xfs_sb_version_hasreflink(&mp->m_sb)) return -EOPNOTSUPP; @@ -1175,6 +1282,9 @@ xfs_reflink_remap_range( if (XFS_IS_REALTIME_INODE(src) || XFS_IS_REALTIME_INODE(dest)) return -EINVAL; + if (flags & ~XFS_REFLINK_ALL) + return -EINVAL; + trace_xfs_reflink_remap_range(src, srcoff, len, dest, destoff); /* Lock both files against IO */ @@ -1186,6 +1296,21 @@ xfs_reflink_remap_range( xfs_lock_two_inodes(src, dest, XFS_MMAPLOCK_EXCL); } + /* + * Check that the extents are the same. + */ + if (flags & XFS_REFLINK_DEDUPE) { + is_same = false; + error = xfs_compare_extents(VFS_I(src), srcoff, VFS_I(dest), + destoff, len, &is_same); + if (error) + goto out_error; + if (!is_same) { + error = -EBADE; + goto out_error; + } + } + error = xfs_reflink_set_inode_flag(src, dest); if (error) goto out_error; diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h index c35ce299281b..df82b2049187 100644 --- a/fs/xfs/xfs_reflink.h +++ b/fs/xfs/xfs_reflink.h @@ -43,7 +43,10 @@ extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset, extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset, xfs_off_t count); extern int xfs_reflink_recover_cow(struct xfs_mount *mp); +#define XFS_REFLINK_DEDUPE 1 /* only reflink if contents match */ +#define XFS_REFLINK_ALL (XFS_REFLINK_DEDUPE) extern int xfs_reflink_remap_range(struct xfs_inode *src, xfs_off_t srcoff, - struct xfs_inode *dest, xfs_off_t destoff, xfs_off_t len); + struct xfs_inode *dest, xfs_off_t destoff, xfs_off_t len, + unsigned int flags); #endif /* __XFS_REFLINK_H */ -- cgit v1.2.3-59-g8ed1b From f86f403794b1446b68afb3c233d4c0bc0e93b654 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:41 -0700 Subject: xfs: teach get_bmapx about shared extents and the CoW fork Teach xfs_getbmapx how to report shared extents and CoW fork contents accurately in the bmap output by querying the refcount btree appropriately. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_fs.h | 4 +- fs/xfs/xfs_bmap_util.c | 154 ++++++++++++++++++++++++++++++++++++++++++++----- 2 files changed, 143 insertions(+), 15 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h index 6f4f2c3d7774..3d1efe5bf37b 100644 --- a/fs/xfs/libxfs/xfs_fs.h +++ b/fs/xfs/libxfs/xfs_fs.h @@ -81,14 +81,16 @@ struct getbmapx { #define BMV_IF_PREALLOC 0x4 /* rtn status BMV_OF_PREALLOC if req */ #define BMV_IF_DELALLOC 0x8 /* rtn status BMV_OF_DELALLOC if req */ #define BMV_IF_NO_HOLES 0x10 /* Do not return holes */ +#define BMV_IF_COWFORK 0x20 /* return CoW fork rather than data */ #define BMV_IF_VALID \ (BMV_IF_ATTRFORK|BMV_IF_NO_DMAPI_READ|BMV_IF_PREALLOC| \ - BMV_IF_DELALLOC|BMV_IF_NO_HOLES) + BMV_IF_DELALLOC|BMV_IF_NO_HOLES|BMV_IF_COWFORK) /* bmv_oflags values - returned for each non-header segment */ #define BMV_OF_PREALLOC 0x1 /* segment = unwritten pre-allocation */ #define BMV_OF_DELALLOC 0x2 /* segment = delayed allocation */ #define BMV_OF_LAST 0x4 /* segment is the last in the file */ +#define BMV_OF_SHARED 0x8 /* segment shared with another file */ /* * Structure for XFS_IOC_FSSETDM. diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index e827d657c314..f7b3f02ff650 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -42,6 +42,9 @@ #include "xfs_icache.h" #include "xfs_log.h" #include "xfs_rmap_btree.h" +#include "xfs_iomap.h" +#include "xfs_reflink.h" +#include "xfs_refcount.h" /* Kernel only BMAP related definitions and functions */ @@ -389,11 +392,13 @@ xfs_bmap_count_blocks( STATIC int xfs_getbmapx_fix_eof_hole( xfs_inode_t *ip, /* xfs incore inode pointer */ + int whichfork, struct getbmapx *out, /* output structure */ int prealloced, /* this is a file with * preallocated data space */ __int64_t end, /* last block requested */ - xfs_fsblock_t startblock) + xfs_fsblock_t startblock, + bool moretocome) { __int64_t fixlen; xfs_mount_t *mp; /* file system mount point */ @@ -418,8 +423,9 @@ xfs_getbmapx_fix_eof_hole( else out->bmv_block = xfs_fsb_to_db(ip, startblock); fileblock = XFS_BB_TO_FSB(ip->i_mount, out->bmv_offset); - ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); - if (xfs_iext_bno_to_ext(ifp, fileblock, &lastx) && + ifp = XFS_IFORK_PTR(ip, whichfork); + if (!moretocome && + xfs_iext_bno_to_ext(ifp, fileblock, &lastx) && (lastx == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))-1)) out->bmv_oflags |= BMV_OF_LAST; } @@ -427,6 +433,81 @@ xfs_getbmapx_fix_eof_hole( return 1; } +/* Adjust the reported bmap around shared/unshared extent transitions. */ +STATIC int +xfs_getbmap_adjust_shared( + struct xfs_inode *ip, + int whichfork, + struct xfs_bmbt_irec *map, + struct getbmapx *out, + struct xfs_bmbt_irec *next_map) +{ + struct xfs_mount *mp = ip->i_mount; + xfs_agnumber_t agno; + xfs_agblock_t agbno; + xfs_agblock_t ebno; + xfs_extlen_t elen; + xfs_extlen_t nlen; + int error; + + next_map->br_startblock = NULLFSBLOCK; + next_map->br_startoff = NULLFILEOFF; + next_map->br_blockcount = 0; + + /* Only written data blocks can be shared. */ + if (!xfs_is_reflink_inode(ip) || whichfork != XFS_DATA_FORK || + map->br_startblock == DELAYSTARTBLOCK || + map->br_startblock == HOLESTARTBLOCK || + ISUNWRITTEN(map)) + return 0; + + agno = XFS_FSB_TO_AGNO(mp, map->br_startblock); + agbno = XFS_FSB_TO_AGBNO(mp, map->br_startblock); + error = xfs_reflink_find_shared(mp, agno, agbno, map->br_blockcount, + &ebno, &elen, true); + if (error) + return error; + + if (ebno == NULLAGBLOCK) { + /* No shared blocks at all. */ + return 0; + } else if (agbno == ebno) { + /* + * Shared extent at (agbno, elen). Shrink the reported + * extent length and prepare to move the start of map[i] + * to agbno+elen, with the aim of (re)formatting the new + * map[i] the next time through the inner loop. + */ + out->bmv_length = XFS_FSB_TO_BB(mp, elen); + out->bmv_oflags |= BMV_OF_SHARED; + if (elen != map->br_blockcount) { + *next_map = *map; + next_map->br_startblock += elen; + next_map->br_startoff += elen; + next_map->br_blockcount -= elen; + } + map->br_blockcount -= elen; + } else { + /* + * There's an unshared extent (agbno, ebno - agbno) + * followed by shared extent at (ebno, elen). Shrink + * the reported extent length to cover only the unshared + * extent and prepare to move up the start of map[i] to + * ebno, with the aim of (re)formatting the new map[i] + * the next time through the inner loop. + */ + *next_map = *map; + nlen = ebno - agbno; + out->bmv_length = XFS_FSB_TO_BB(mp, nlen); + next_map->br_startblock += nlen; + next_map->br_startoff += nlen; + next_map->br_blockcount -= nlen; + map->br_blockcount -= nlen; + } + + return 0; +} + /* * Get inode's extents as described in bmv, and format for output. * Calls formatter to fill the user's buffer until all extents @@ -459,12 +540,28 @@ xfs_getbmap( int iflags; /* interface flags */ int bmapi_flags; /* flags for xfs_bmapi */ int cur_ext = 0; + struct xfs_bmbt_irec inject_map; mp = ip->i_mount; iflags = bmv->bmv_iflags; - whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK; - if (whichfork == XFS_ATTR_FORK) { +#ifndef DEBUG + /* Only allow CoW fork queries if we're debugging. */ + if (iflags & BMV_IF_COWFORK) + return -EINVAL; +#endif + if ((iflags & BMV_IF_ATTRFORK) && (iflags & BMV_IF_COWFORK)) + return -EINVAL; + + if (iflags & BMV_IF_ATTRFORK) + whichfork = XFS_ATTR_FORK; + else if (iflags & BMV_IF_COWFORK) + whichfork = XFS_COW_FORK; + else + whichfork = XFS_DATA_FORK; + + switch (whichfork) { + case XFS_ATTR_FORK: if (XFS_IFORK_Q(ip)) { if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS && ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE && @@ -480,7 +577,15 @@ xfs_getbmap( prealloced = 0; fixlen = 1LL << 32; - } else { + break; + case XFS_COW_FORK: + if (ip->i_cformat != XFS_DINODE_FMT_EXTENTS) + return -EINVAL; + + prealloced = 0; + fixlen = XFS_ISIZE(ip); + break; + default: if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS && ip->i_d.di_format != XFS_DINODE_FMT_BTREE && ip->i_d.di_format != XFS_DINODE_FMT_LOCAL) @@ -494,6 +599,7 @@ xfs_getbmap( prealloced = 0; fixlen = XFS_ISIZE(ip); } + break; } if (bmv->bmv_length == -1) { @@ -520,7 +626,8 @@ xfs_getbmap( return -ENOMEM; xfs_ilock(ip, XFS_IOLOCK_SHARED); - if (whichfork == XFS_DATA_FORK) { + switch (whichfork) { + case XFS_DATA_FORK: if (!(iflags & BMV_IF_DELALLOC) && (ip->i_delayed_blks || XFS_ISIZE(ip) > ip->i_d.di_size)) { error = filemap_write_and_wait(VFS_I(ip)->i_mapping); @@ -538,8 +645,14 @@ xfs_getbmap( } lock = xfs_ilock_data_map_shared(ip); - } else { + break; + case XFS_COW_FORK: + lock = XFS_ILOCK_SHARED; + xfs_ilock(ip, lock); + break; + case XFS_ATTR_FORK: lock = xfs_ilock_attr_map_shared(ip); + break; } /* @@ -581,7 +694,8 @@ xfs_getbmap( goto out_free_map; ASSERT(nmap <= subnex); - for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) { + for (i = 0; i < nmap && nexleft && bmv->bmv_length && + cur_ext < bmv->bmv_count; i++) { out[cur_ext].bmv_oflags = 0; if (map[i].br_state == XFS_EXT_UNWRITTEN) out[cur_ext].bmv_oflags |= BMV_OF_PREALLOC; @@ -614,9 +728,16 @@ xfs_getbmap( goto out_free_map; } - if (!xfs_getbmapx_fix_eof_hole(ip, &out[cur_ext], - prealloced, bmvend, - map[i].br_startblock)) + /* Is this a shared block? */ + error = xfs_getbmap_adjust_shared(ip, whichfork, + &map[i], &out[cur_ext], &inject_map); + if (error) + goto out_free_map; + + if (!xfs_getbmapx_fix_eof_hole(ip, whichfork, + &out[cur_ext], prealloced, bmvend, + map[i].br_startblock, + inject_map.br_startblock != NULLFSBLOCK)) goto out_free_map; bmv->bmv_offset = @@ -636,11 +757,16 @@ xfs_getbmap( continue; } - nexleft--; + if (inject_map.br_startblock != NULLFSBLOCK) { + map[i] = inject_map; + i--; + } else + nexleft--; bmv->bmv_entries++; cur_ext++; } - } while (nmap && nexleft && bmv->bmv_length); + } while (nmap && nexleft && bmv->bmv_length && + cur_ext < bmv->bmv_count); out_free_map: kmem_free(map); -- cgit v1.2.3-59-g8ed1b From f0bc4d134b46607967bda1205ce3226a1bd95f42 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:42 -0700 Subject: xfs: swap inode reflink flags when swapping inode extents When we're swapping the extents of two inodes, be sure to swap the reflink inode flag too. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_bmap_util.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'fs') diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index f7b3f02ff650..e2f46e645612 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -1660,6 +1660,8 @@ xfs_swap_extents( int taforkblks = 0; __uint64_t tmp; int lock_flags; + struct xfs_ifork *cowfp; + __uint64_t f; /* XXX: we can't do this with rmap, will fix later */ if (xfs_sb_version_hasrmapbt(&mp->m_sb)) @@ -1873,6 +1875,19 @@ xfs_swap_extents( break; } + /* Do we have to swap reflink flags? */ + if ((ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK) ^ + (tip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK)) { + f = ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK; + ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK; + ip->i_d.di_flags2 |= tip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK; + tip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK; + tip->i_d.di_flags2 |= f & XFS_DIFLAG2_REFLINK; + cowfp = ip->i_cowfp; + ip->i_cowfp = tip->i_cowfp; + tip->i_cowfp = cowfp; + } + xfs_trans_log_inode(tp, ip, src_log_flags); xfs_trans_log_inode(tp, tip, target_log_flags); -- cgit v1.2.3-59-g8ed1b From 98cc2db5b8b2c9f38aebf54a7b03657406b6de26 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:43 -0700 Subject: xfs: unshare a range of blocks via fallocate Unshare all shared extents if the user calls fallocate with the new unshare mode flag set, so that we can guarantee that a subsequent write will not ENOSPC. Signed-off-by: Darrick J. Wong [hch: pass inode instead of file to xfs_reflink_dirty_range, use iomap infrastructure for copy up] Signed-off-by: Christoph Hellwig --- fs/xfs/xfs_file.c | 10 +- fs/xfs/xfs_reflink.c | 255 +++++++++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_reflink.h | 4 + 3 files changed, 267 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 39fde9f51303..07f951dd2685 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -848,7 +848,7 @@ buffered: #define XFS_FALLOC_FL_SUPPORTED \ (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \ FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE | \ - FALLOC_FL_INSERT_RANGE) + FALLOC_FL_INSERT_RANGE | FALLOC_FL_UNSHARE_RANGE) STATIC long xfs_file_fallocate( @@ -938,9 +938,15 @@ xfs_file_fallocate( if (mode & FALLOC_FL_ZERO_RANGE) error = xfs_zero_file_space(ip, offset, len); - else + else { + if (mode & FALLOC_FL_UNSHARE_RANGE) { + error = xfs_reflink_unshare(ip, offset, len); + if (error) + goto out_unlock; + } error = xfs_alloc_file_space(ip, offset, len, XFS_BMAPI_PREALLOC); + } if (error) goto out_unlock; } diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 6b22669421b2..d4707e627a74 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1345,3 +1345,258 @@ out_error: trace_xfs_reflink_remap_range_error(dest, error, _RET_IP_); return error; } + +/* + * The user wants to preemptively CoW all shared blocks in this file, + * which enables us to turn off the reflink flag. Iterate all + * extents which are not prealloc/delalloc to see which ranges are + * mentioned in the refcount tree, then read those blocks into the + * pagecache, dirty them, fsync them back out, and then we can update + * the inode flag. What happens if we run out of memory? :) + */ +STATIC int +xfs_reflink_dirty_extents( + struct xfs_inode *ip, + xfs_fileoff_t fbno, + xfs_filblks_t end, + xfs_off_t isize) +{ + struct xfs_mount *mp = ip->i_mount; + xfs_agnumber_t agno; + xfs_agblock_t agbno; + xfs_extlen_t aglen; + xfs_agblock_t rbno; + xfs_extlen_t rlen; + xfs_off_t fpos; + xfs_off_t flen; + struct xfs_bmbt_irec map[2]; + int nmaps; + int error; + + while (end - fbno > 0) { + nmaps = 1; + /* + * Look for extents in the file. Skip holes, delalloc, or + * unwritten extents; they can't be reflinked. + */ + error = xfs_bmapi_read(ip, fbno, end - fbno, map, &nmaps, 0); + if (error) + goto out; + if (nmaps == 0) + break; + if (map[0].br_startblock == HOLESTARTBLOCK || + map[0].br_startblock == DELAYSTARTBLOCK || + ISUNWRITTEN(&map[0])) + goto next; + + map[1] = map[0]; + while (map[1].br_blockcount) { + agno = XFS_FSB_TO_AGNO(mp, map[1].br_startblock); + agbno = XFS_FSB_TO_AGBNO(mp, map[1].br_startblock); + aglen = map[1].br_blockcount; + + error = xfs_reflink_find_shared(mp, agno, agbno, aglen, + &rbno, &rlen, true); + if (error) + goto out; + if (rbno == NULLAGBLOCK) + break; + + /* Dirty the pages */ + xfs_iunlock(ip, XFS_ILOCK_EXCL); + fpos = XFS_FSB_TO_B(mp, map[1].br_startoff + + (rbno - agbno)); + flen = XFS_FSB_TO_B(mp, rlen); + if (fpos + flen > isize) + flen = isize - fpos; + error = iomap_file_dirty(VFS_I(ip), fpos, flen, + &xfs_iomap_ops); + xfs_ilock(ip, XFS_ILOCK_EXCL); + if (error) + goto out; + + map[1].br_blockcount -= (rbno - agbno + rlen); + map[1].br_startoff += (rbno - agbno + rlen); + map[1].br_startblock += (rbno - agbno + rlen); + } + +next: + fbno = map[0].br_startoff + map[0].br_blockcount; + } +out: + return error; +} + +/* Clear the inode reflink flag if there are no shared extents. */ +int +xfs_reflink_clear_inode_flag( + struct xfs_inode *ip, + struct xfs_trans **tpp) +{ + struct xfs_mount *mp = ip->i_mount; + xfs_fileoff_t fbno; + xfs_filblks_t end; + xfs_agnumber_t agno; + xfs_agblock_t agbno; + xfs_extlen_t aglen; + xfs_agblock_t rbno; + xfs_extlen_t rlen; + struct xfs_bmbt_irec map[2]; + int nmaps; + int error = 0; + + if (!(ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK)) + return 0; + + fbno = 0; + end = XFS_B_TO_FSB(mp, i_size_read(VFS_I(ip))); + while (end - fbno > 0) { + nmaps = 1; + /* + * Look for extents in the file. Skip holes, delalloc, or + * unwritten extents; they can't be reflinked. + */ + error = xfs_bmapi_read(ip, fbno, end - fbno, map, &nmaps, 0); + if (error) + return error; + if (nmaps == 0) + break; + if (map[0].br_startblock == HOLESTARTBLOCK || + map[0].br_startblock == DELAYSTARTBLOCK || + ISUNWRITTEN(&map[0])) + goto next; + + map[1] = map[0]; + while (map[1].br_blockcount) { + agno = XFS_FSB_TO_AGNO(mp, map[1].br_startblock); + agbno = XFS_FSB_TO_AGBNO(mp, map[1].br_startblock); + aglen = map[1].br_blockcount; + + error = xfs_reflink_find_shared(mp, agno, agbno, aglen, + &rbno, &rlen, false); + if (error) + return error; + /* Is there still a shared block here? */ + if (rbno != NULLAGBLOCK) + return 0; + + map[1].br_blockcount -= aglen; + map[1].br_startoff += aglen; + map[1].br_startblock += aglen; + } + +next: + fbno = map[0].br_startoff + map[0].br_blockcount; + } + + /* + * We didn't find any shared blocks so turn off the reflink flag. + * First, get rid of any leftover CoW mappings. + */ + error = xfs_reflink_cancel_cow_blocks(ip, tpp, 0, NULLFILEOFF); + if (error) + return error; + + /* Clear the inode flag. */ + trace_xfs_reflink_unset_inode_flag(ip); + ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK; + xfs_trans_ijoin(*tpp, ip, 0); + xfs_trans_log_inode(*tpp, ip, XFS_ILOG_CORE); + + return error; +} + +/* + * Clear the inode reflink flag if there are no shared extents and the size + * hasn't changed. + */ +STATIC int +xfs_reflink_try_clear_inode_flag( + struct xfs_inode *ip, + xfs_off_t old_isize) +{ + struct xfs_mount *mp = ip->i_mount; + struct xfs_trans *tp; + int error = 0; + + /* Start a rolling transaction to remove the mappings */ + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0, 0, 0, &tp); + if (error) + return error; + + xfs_ilock(ip, XFS_ILOCK_EXCL); + xfs_trans_ijoin(tp, ip, 0); + + if (old_isize != i_size_read(VFS_I(ip))) + goto cancel; + + error = xfs_reflink_clear_inode_flag(ip, &tp); + if (error) + goto cancel; + + error = xfs_trans_commit(tp); + if (error) + goto out; + + xfs_iunlock(ip, XFS_ILOCK_EXCL); + return 0; +cancel: + xfs_trans_cancel(tp); +out: + xfs_iunlock(ip, XFS_ILOCK_EXCL); + return error; +} + +/* + * Pre-COW all shared blocks within a given byte range of a file and turn off + * the reflink flag if we unshare all of the file's blocks. + */ +int +xfs_reflink_unshare( + struct xfs_inode *ip, + xfs_off_t offset, + xfs_off_t len) +{ + struct xfs_mount *mp = ip->i_mount; + xfs_fileoff_t fbno; + xfs_filblks_t end; + xfs_off_t isize; + int error; + + if (!xfs_is_reflink_inode(ip)) + return 0; + + trace_xfs_reflink_unshare(ip, offset, len); + + inode_dio_wait(VFS_I(ip)); + + /* Try to CoW the selected ranges */ + xfs_ilock(ip, XFS_ILOCK_EXCL); + fbno = XFS_B_TO_FSB(mp, offset); + isize = i_size_read(VFS_I(ip)); + end = XFS_B_TO_FSB(mp, offset + len); + error = xfs_reflink_dirty_extents(ip, fbno, end, isize); + if (error) + goto out_unlock; + xfs_iunlock(ip, XFS_ILOCK_EXCL); + + /* Wait for the IO to finish */ + error = filemap_write_and_wait(VFS_I(ip)->i_mapping); + if (error) + goto out; + + /* Turn off the reflink flag if we unshared the whole file */ + if (offset == 0 && len == isize) { + error = xfs_reflink_try_clear_inode_flag(ip, isize); + if (error) + goto out; + } + + return 0; + +out_unlock: + xfs_iunlock(ip, XFS_ILOCK_EXCL); +out: + trace_xfs_reflink_unshare_error(ip, error, _RET_IP_); + return error; +} diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h index df82b2049187..bade5a61f3b0 100644 --- a/fs/xfs/xfs_reflink.h +++ b/fs/xfs/xfs_reflink.h @@ -48,5 +48,9 @@ extern int xfs_reflink_recover_cow(struct xfs_mount *mp); extern int xfs_reflink_remap_range(struct xfs_inode *src, xfs_off_t srcoff, struct xfs_inode *dest, xfs_off_t destoff, xfs_off_t len, unsigned int flags); +extern int xfs_reflink_clear_inode_flag(struct xfs_inode *ip, + struct xfs_trans **tpp); +extern int xfs_reflink_unshare(struct xfs_inode *ip, xfs_off_t offset, + xfs_off_t len); #endif /* __XFS_REFLINK_H */ -- cgit v1.2.3-59-g8ed1b From f7ca35227253dc8244fd908140b06010e67a31e5 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:43 -0700 Subject: xfs: create a separate cow extent size hint for the allocator Create a per-inode extent size allocator hint for copy-on-write. This hint is separate from the existing extent size hint so that CoW can take advantage of the fragmentation-reducing properties of extent size hints without disabling delalloc for regular writes. The extent size hint that's fed to the allocator during a copy on write operation is the greater of the cowextsize and regular extsize hint. During reflink, if we're sharing the entire source file to the entire destination file and the destination file doesn't already have a cowextsize hint, propagate the source file's cowextsize hint to the destination file. Furthermore, zero the bulkstat buffer prior to setting the fields so that we don't copy kernel memory contents into userspace. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_bmap.c | 9 ++++-- fs/xfs/libxfs/xfs_format.h | 3 +- fs/xfs/libxfs/xfs_fs.h | 3 +- fs/xfs/libxfs/xfs_inode_buf.c | 4 ++- fs/xfs/libxfs/xfs_inode_buf.h | 1 + fs/xfs/libxfs/xfs_log_format.h | 3 +- fs/xfs/xfs_bmap_util.c | 9 ++++-- fs/xfs/xfs_inode.c | 33 +++++++++++++++++++++ fs/xfs/xfs_inode.h | 1 + fs/xfs/xfs_inode_item.c | 2 +- fs/xfs/xfs_ioctl.c | 67 ++++++++++++++++++++++++++++++++++++++++-- fs/xfs/xfs_iomap.c | 2 +- fs/xfs/xfs_iomap.h | 1 + fs/xfs/xfs_itable.c | 8 ++++- fs/xfs/xfs_reflink.c | 41 +++++++++++++++++++++----- 15 files changed, 167 insertions(+), 20 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index e4bf2c406e3b..9702f4c112bf 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -3666,7 +3666,9 @@ xfs_bmap_btalloc( else if (mp->m_dalign) stripe_align = mp->m_dalign; - if (xfs_alloc_is_userdata(ap->datatype)) + if (ap->flags & XFS_BMAPI_COWFORK) + align = xfs_get_cowextsz_hint(ap->ip); + else if (xfs_alloc_is_userdata(ap->datatype)) align = xfs_get_extsz_hint(ap->ip); if (unlikely(align)) { error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, @@ -4192,7 +4194,10 @@ xfs_bmapi_reserve_delalloc( alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff); /* Figure out the extent size, adjust alen */ - extsz = xfs_get_extsz_hint(ip); + if (whichfork == XFS_COW_FORK) + extsz = xfs_get_cowextsz_hint(ip); + else + extsz = xfs_get_extsz_hint(ip); if (extsz) { error = xfs_bmap_extsize_align(mp, got, prev, extsz, rt, eof, 1, 0, &aoff, &alen); diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 777fa974a319..5e04ea2aa902 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -901,7 +901,8 @@ typedef struct xfs_dinode { __be64 di_changecount; /* number of attribute changes */ __be64 di_lsn; /* flush sequence */ __be64 di_flags2; /* more random flags */ - __u8 di_pad2[16]; /* more padding for future expansion */ + __be32 di_cowextsize; /* basic cow extent size for file */ + __u8 di_pad2[12]; /* more padding for future expansion */ /* fields only written to during inode creation */ xfs_timestamp_t di_crtime; /* time created */ diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h index 3d1efe5bf37b..b72dc821d78b 100644 --- a/fs/xfs/libxfs/xfs_fs.h +++ b/fs/xfs/libxfs/xfs_fs.h @@ -278,7 +278,8 @@ typedef struct xfs_bstat { #define bs_projid bs_projid_lo /* (previously just bs_projid) */ __u16 bs_forkoff; /* inode fork offset in bytes */ __u16 bs_projid_hi; /* higher part of project id */ - unsigned char bs_pad[10]; /* pad space, unused */ + unsigned char bs_pad[6]; /* pad space, unused */ + __u32 bs_cowextsize; /* cow extent size */ __u32 bs_dmevmask; /* DMIG event mask */ __u16 bs_dmstate; /* DMIG state info */ __u16 bs_aextents; /* attribute number of extents */ diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c index 4b9769e23c83..a3e803823a19 100644 --- a/fs/xfs/libxfs/xfs_inode_buf.c +++ b/fs/xfs/libxfs/xfs_inode_buf.c @@ -256,6 +256,7 @@ xfs_inode_from_disk( to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec); to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec); to->di_flags2 = be64_to_cpu(from->di_flags2); + to->di_cowextsize = be32_to_cpu(from->di_cowextsize); } } @@ -305,7 +306,7 @@ xfs_inode_to_disk( to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec); to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec); to->di_flags2 = cpu_to_be64(from->di_flags2); - + to->di_cowextsize = cpu_to_be32(from->di_cowextsize); to->di_ino = cpu_to_be64(ip->i_ino); to->di_lsn = cpu_to_be64(lsn); memset(to->di_pad2, 0, sizeof(to->di_pad2)); @@ -357,6 +358,7 @@ xfs_log_dinode_to_disk( to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec); to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec); to->di_flags2 = cpu_to_be64(from->di_flags2); + to->di_cowextsize = cpu_to_be32(from->di_cowextsize); to->di_ino = cpu_to_be64(from->di_ino); to->di_lsn = cpu_to_be64(from->di_lsn); memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2)); diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h index 7c4dd321b215..62d9d4681c8c 100644 --- a/fs/xfs/libxfs/xfs_inode_buf.h +++ b/fs/xfs/libxfs/xfs_inode_buf.h @@ -47,6 +47,7 @@ struct xfs_icdinode { __uint16_t di_flags; /* random flags, XFS_DIFLAG_... */ __uint64_t di_flags2; /* more random flags */ + __uint32_t di_cowextsize; /* basic cow extent size for file */ xfs_ictimestamp_t di_crtime; /* time created */ }; diff --git a/fs/xfs/libxfs/xfs_log_format.h b/fs/xfs/libxfs/xfs_log_format.h index 5dd7c2e8f439..364ce6fcc213 100644 --- a/fs/xfs/libxfs/xfs_log_format.h +++ b/fs/xfs/libxfs/xfs_log_format.h @@ -423,7 +423,8 @@ struct xfs_log_dinode { __uint64_t di_changecount; /* number of attribute changes */ xfs_lsn_t di_lsn; /* flush sequence */ __uint64_t di_flags2; /* more random flags */ - __uint8_t di_pad2[16]; /* more padding for future expansion */ + __uint32_t di_cowextsize; /* basic cow extent size for file */ + __uint8_t di_pad2[12]; /* more padding for future expansion */ /* fields only written to during inode creation */ xfs_ictimestamp_t di_crtime; /* time created */ diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index e2f46e645612..4a807f05e460 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -582,8 +582,13 @@ xfs_getbmap( if (ip->i_cformat != XFS_DINODE_FMT_EXTENTS) return -EINVAL; - prealloced = 0; - fixlen = XFS_ISIZE(ip); + if (xfs_get_cowextsz_hint(ip)) { + prealloced = 1; + fixlen = mp->m_super->s_maxbytes; + } else { + prealloced = 0; + fixlen = XFS_ISIZE(ip); + } break; default: if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS && diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index f072f48b3c04..09640bdd3e44 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -77,6 +77,27 @@ xfs_get_extsz_hint( return 0; } +/* + * Helper function to extract CoW extent size hint from inode. + * Between the extent size hint and the CoW extent size hint, we + * return the greater of the two. + */ +xfs_extlen_t +xfs_get_cowextsz_hint( + struct xfs_inode *ip) +{ + xfs_extlen_t a, b; + + a = 0; + if (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE) + a = ip->i_d.di_cowextsize; + b = xfs_get_extsz_hint(ip); + + if (a > b) + return a; + return b; +} + /* * These two are wrapper routines around the xfs_ilock() routine used to * centralize some grungy code. They are used in places that wish to lock the @@ -652,6 +673,8 @@ _xfs_dic2xflags( if (di_flags2 & XFS_DIFLAG2_ANY) { if (di_flags2 & XFS_DIFLAG2_DAX) flags |= FS_XFLAG_DAX; + if (di_flags2 & XFS_DIFLAG2_COWEXTSIZE) + flags |= FS_XFLAG_COWEXTSIZE; } if (has_attr) @@ -835,6 +858,7 @@ xfs_ialloc( if (ip->i_d.di_version == 3) { inode->i_version = 1; ip->i_d.di_flags2 = 0; + ip->i_d.di_cowextsize = 0; ip->i_d.di_crtime.t_sec = (__int32_t)tv.tv_sec; ip->i_d.di_crtime.t_nsec = (__int32_t)tv.tv_nsec; } @@ -897,6 +921,15 @@ xfs_ialloc( ip->i_d.di_flags |= di_flags; ip->i_d.di_flags2 |= di_flags2; } + if (pip && + (pip->i_d.di_flags2 & XFS_DIFLAG2_ANY) && + pip->i_d.di_version == 3 && + ip->i_d.di_version == 3) { + if (pip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE) { + ip->i_d.di_flags2 |= XFS_DIFLAG2_COWEXTSIZE; + ip->i_d.di_cowextsize = pip->i_d.di_cowextsize; + } + } /* FALLTHROUGH */ case S_IFLNK: ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS; diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index ff6fc03c0092..6d63dc031127 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -426,6 +426,7 @@ int xfs_iflush(struct xfs_inode *, struct xfs_buf **); void xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint); xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip); +xfs_extlen_t xfs_get_cowextsz_hint(struct xfs_inode *ip); int xfs_dir_ialloc(struct xfs_trans **, struct xfs_inode *, umode_t, xfs_nlink_t, xfs_dev_t, prid_t, int, diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c index 892c2aced207..9610e9c00952 100644 --- a/fs/xfs/xfs_inode_item.c +++ b/fs/xfs/xfs_inode_item.c @@ -368,7 +368,7 @@ xfs_inode_to_log_dinode( to->di_crtime.t_sec = from->di_crtime.t_sec; to->di_crtime.t_nsec = from->di_crtime.t_nsec; to->di_flags2 = from->di_flags2; - + to->di_cowextsize = from->di_cowextsize; to->di_ino = ip->i_ino; to->di_lsn = lsn; memset(to->di_pad2, 0, sizeof(to->di_pad2)); diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 96a70fd1f5d6..1388a1275dc8 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -903,6 +903,8 @@ xfs_ioc_fsgetxattr( xfs_ilock(ip, XFS_ILOCK_SHARED); fa.fsx_xflags = xfs_ip2xflags(ip); fa.fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog; + fa.fsx_cowextsize = ip->i_d.di_cowextsize << + ip->i_mount->m_sb.sb_blocklog; fa.fsx_projid = xfs_get_projid(ip); if (attr) { @@ -973,12 +975,13 @@ xfs_set_diflags( if (ip->i_d.di_version < 3) return; - di_flags2 = 0; + di_flags2 = (ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK); if (xflags & FS_XFLAG_DAX) di_flags2 |= XFS_DIFLAG2_DAX; + if (xflags & FS_XFLAG_COWEXTSIZE) + di_flags2 |= XFS_DIFLAG2_COWEXTSIZE; ip->i_d.di_flags2 = di_flags2; - } STATIC void @@ -1219,6 +1222,56 @@ xfs_ioctl_setattr_check_extsize( return 0; } +/* + * CoW extent size hint validation rules are: + * + * 1. CoW extent size hint can only be set if reflink is enabled on the fs. + * The inode does not have to have any shared blocks, but it must be a v3. + * 2. FS_XFLAG_COWEXTSIZE is only valid for directories and regular files; + * for a directory, the hint is propagated to new files. + * 3. Can be changed on files & directories at any time. + * 4. CoW extsize hint of 0 turns off hints, clears inode flags. + * 5. Extent size must be a multiple of the appropriate block size. + * 6. The extent size hint must be limited to half the AG size to avoid + * alignment extending the extent beyond the limits of the AG. + */ +static int +xfs_ioctl_setattr_check_cowextsize( + struct xfs_inode *ip, + struct fsxattr *fa) +{ + struct xfs_mount *mp = ip->i_mount; + + if (!(fa->fsx_xflags & FS_XFLAG_COWEXTSIZE)) + return 0; + + if (!xfs_sb_version_hasreflink(&ip->i_mount->m_sb) || + ip->i_d.di_version != 3) + return -EINVAL; + + if (!S_ISREG(VFS_I(ip)->i_mode) && !S_ISDIR(VFS_I(ip)->i_mode)) + return -EINVAL; + + if (fa->fsx_cowextsize != 0) { + xfs_extlen_t size; + xfs_fsblock_t cowextsize_fsb; + + cowextsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_cowextsize); + if (cowextsize_fsb > MAXEXTLEN) + return -EINVAL; + + size = mp->m_sb.sb_blocksize; + if (cowextsize_fsb > mp->m_sb.sb_agblocks / 2) + return -EINVAL; + + if (fa->fsx_cowextsize % size) + return -EINVAL; + } else + fa->fsx_xflags &= ~FS_XFLAG_COWEXTSIZE; + + return 0; +} + static int xfs_ioctl_setattr_check_projid( struct xfs_inode *ip, @@ -1311,6 +1364,10 @@ xfs_ioctl_setattr( if (code) goto error_trans_cancel; + code = xfs_ioctl_setattr_check_cowextsize(ip, fa); + if (code) + goto error_trans_cancel; + code = xfs_ioctl_setattr_xflags(tp, ip, fa); if (code) goto error_trans_cancel; @@ -1346,6 +1403,12 @@ xfs_ioctl_setattr( ip->i_d.di_extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog; else ip->i_d.di_extsize = 0; + if (ip->i_d.di_version == 3 && + (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE)) + ip->i_d.di_cowextsize = fa->fsx_cowextsize >> + mp->m_sb.sb_blocklog; + else + ip->i_d.di_cowextsize = 0; code = xfs_trans_commit(tp); diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 765849ed9b70..d907eb9f8ef3 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -71,7 +71,7 @@ xfs_bmbt_to_iomap( iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip)); } -static xfs_extlen_t +xfs_extlen_t xfs_eof_alignment( struct xfs_inode *ip, xfs_extlen_t extsize) diff --git a/fs/xfs/xfs_iomap.h b/fs/xfs/xfs_iomap.h index a16b9567e76b..6d45cf01fcff 100644 --- a/fs/xfs/xfs_iomap.h +++ b/fs/xfs/xfs_iomap.h @@ -31,6 +31,7 @@ int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, xfs_off_t); void xfs_bmbt_to_iomap(struct xfs_inode *, struct iomap *, struct xfs_bmbt_irec *); +xfs_extlen_t xfs_eof_alignment(struct xfs_inode *ip, xfs_extlen_t extsize); extern struct iomap_ops xfs_iomap_ops; extern struct iomap_ops xfs_xattr_iomap_ops; diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c index ce73eb34620d..66e881790c17 100644 --- a/fs/xfs/xfs_itable.c +++ b/fs/xfs/xfs_itable.c @@ -66,7 +66,7 @@ xfs_bulkstat_one_int( if (!buffer || xfs_internal_inum(mp, ino)) return -EINVAL; - buf = kmem_alloc(sizeof(*buf), KM_SLEEP | KM_MAYFAIL); + buf = kmem_zalloc(sizeof(*buf), KM_SLEEP | KM_MAYFAIL); if (!buf) return -ENOMEM; @@ -111,6 +111,12 @@ xfs_bulkstat_one_int( buf->bs_aextents = dic->di_anextents; buf->bs_forkoff = XFS_IFORK_BOFF(ip); + if (dic->di_version == 3) { + if (dic->di_flags2 & XFS_DIFLAG2_COWEXTSIZE) + buf->bs_cowextsize = dic->di_cowextsize << + mp->m_sb.sb_blocklog; + } + switch (dic->di_format) { case XFS_DINODE_FMT_DEV: buf->bs_rdev = ip->i_df.if_u2.if_rdev; diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index d4707e627a74..8e894118295f 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -238,6 +238,7 @@ __xfs_reflink_reserve_cow( int nimaps, eof = 0, error = 0; bool shared = false, trimmed = false; xfs_extnum_t idx; + xfs_extlen_t align; /* Already reserved? Skip the refcount btree access. */ xfs_bmap_search_extents(ip, *offset_fsb, XFS_COW_FORK, &eof, &idx, @@ -277,6 +278,10 @@ __xfs_reflink_reserve_cow( if (error) goto out_unlock; + align = xfs_eof_alignment(ip, xfs_get_cowextsz_hint(ip)); + if (align) + end_fsb = roundup_64(end_fsb, align); + retry: error = xfs_bmapi_reserve_delalloc(ip, XFS_COW_FORK, *offset_fsb, end_fsb - *offset_fsb, &got, @@ -927,18 +932,19 @@ out_error: } /* - * Update destination inode size, if necessary. + * Update destination inode size & cowextsize hint, if necessary. */ STATIC int xfs_reflink_update_dest( struct xfs_inode *dest, - xfs_off_t newlen) + xfs_off_t newlen, + xfs_extlen_t cowextsize) { struct xfs_mount *mp = dest->i_mount; struct xfs_trans *tp; int error; - if (newlen <= i_size_read(VFS_I(dest))) + if (newlen <= i_size_read(VFS_I(dest)) && cowextsize == 0) return 0; error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp); @@ -948,9 +954,17 @@ xfs_reflink_update_dest( xfs_ilock(dest, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, dest, XFS_ILOCK_EXCL); - trace_xfs_reflink_update_inode_size(dest, newlen); - i_size_write(VFS_I(dest), newlen); - dest->i_d.di_size = newlen; + if (newlen > i_size_read(VFS_I(dest))) { + trace_xfs_reflink_update_inode_size(dest, newlen); + i_size_write(VFS_I(dest), newlen); + dest->i_d.di_size = newlen; + } + + if (cowextsize) { + dest->i_d.di_cowextsize = cowextsize; + dest->i_d.di_flags2 |= XFS_DIFLAG2_COWEXTSIZE; + } + xfs_trans_log_inode(tp, dest, XFS_ILOG_CORE); error = xfs_trans_commit(tp); @@ -1270,6 +1284,7 @@ xfs_reflink_remap_range( xfs_fileoff_t sfsbno, dfsbno; xfs_filblks_t fsblen; int error; + xfs_extlen_t cowextsize; bool is_same; if (!xfs_sb_version_hasreflink(&mp->m_sb)) @@ -1330,7 +1345,19 @@ xfs_reflink_remap_range( if (error) goto out_error; - error = xfs_reflink_update_dest(dest, destoff + len); + /* + * Carry the cowextsize hint from src to dest if we're sharing the + * entire source file to the entire destination file, the source file + * has a cowextsize hint, and the destination file does not. + */ + cowextsize = 0; + if (srcoff == 0 && len == i_size_read(VFS_I(src)) && + (src->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE) && + destoff == 0 && len >= i_size_read(VFS_I(dest)) && + !(dest->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE)) + cowextsize = src->i_d.di_cowextsize; + + error = xfs_reflink_update_dest(dest, destoff + len, cowextsize); if (error) goto out_error; -- cgit v1.2.3-59-g8ed1b From 84d6961910ea7b3ae8d8338f5b4df25dea68cee9 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:44 -0700 Subject: xfs: preallocate blocks for worst-case btree expansion To gracefully handle the situation where a CoW operation turns a single refcount extent into a lot of tiny ones and then run out of space when a tree split has to happen, use the per-AG reserved block pool to pre-allocate all the space we'll ever need for a maximal btree. For a 4K block size, this only costs an overhead of 0.3% of available disk space. When reflink is enabled, we have an unfortunate problem with rmap -- since we can share a block billions of times, this means that the reverse mapping btree can expand basically infinitely. When an AG is so full that there are no free blocks with which to expand the rmapbt, the filesystem will shut down hard. This is rather annoying to the user, so use the AG reservation code to reserve a "reasonable" amount of space for rmap. We'll prevent reflinks and CoW operations if we think we're getting close to exhausting an AG's free space rather than shutting down, but this permanent reservation should be enough for "most" users. Hopefully. Signed-off-by: Darrick J. Wong [hch@lst.de: ensure that we invalidate the freed btree buffer] Signed-off-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_ag_resv.c | 11 ++++++ fs/xfs/libxfs/xfs_refcount_btree.c | 68 ++++++++++++++++++++++++++++++++++++-- fs/xfs/libxfs/xfs_refcount_btree.h | 7 ++++ fs/xfs/libxfs/xfs_rmap_btree.c | 60 +++++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_rmap_btree.h | 7 ++++ fs/xfs/xfs_fsops.c | 64 +++++++++++++++++++++++++++++++++++ fs/xfs/xfs_fsops.h | 3 ++ fs/xfs/xfs_mount.c | 8 +++++ fs/xfs/xfs_super.c | 12 +++++++ 9 files changed, 237 insertions(+), 3 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_ag_resv.c b/fs/xfs/libxfs/xfs_ag_resv.c index e3ae0f2b4294..adf770f0d011 100644 --- a/fs/xfs/libxfs/xfs_ag_resv.c +++ b/fs/xfs/libxfs/xfs_ag_resv.c @@ -38,6 +38,7 @@ #include "xfs_trans_space.h" #include "xfs_rmap_btree.h" #include "xfs_btree.h" +#include "xfs_refcount_btree.h" /* * Per-AG Block Reservations @@ -228,6 +229,11 @@ xfs_ag_resv_init( if (pag->pag_meta_resv.ar_asked == 0) { ask = used = 0; + error = xfs_refcountbt_calc_reserves(pag->pag_mount, + pag->pag_agno, &ask, &used); + if (error) + goto out; + error = __xfs_ag_resv_init(pag, XFS_AG_RESV_METADATA, ask, used); if (error) @@ -238,6 +244,11 @@ xfs_ag_resv_init( if (pag->pag_agfl_resv.ar_asked == 0) { ask = used = 0; + error = xfs_rmapbt_calc_reserves(pag->pag_mount, pag->pag_agno, + &ask, &used); + if (error) + goto out; + error = __xfs_ag_resv_init(pag, XFS_AG_RESV_AGFL, ask, used); if (error) goto out; diff --git a/fs/xfs/libxfs/xfs_refcount_btree.c b/fs/xfs/libxfs/xfs_refcount_btree.c index 81d58b09af71..453bb2757ec2 100644 --- a/fs/xfs/libxfs/xfs_refcount_btree.c +++ b/fs/xfs/libxfs/xfs_refcount_btree.c @@ -79,6 +79,8 @@ xfs_refcountbt_alloc_block( struct xfs_alloc_arg args; /* block allocation args */ int error; /* error return value */ + XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY); + memset(&args, 0, sizeof(args)); args.tp = cur->bc_tp; args.mp = cur->bc_mp; @@ -88,6 +90,7 @@ xfs_refcountbt_alloc_block( args.firstblock = args.fsbno; xfs_rmap_ag_owner(&args.oinfo, XFS_RMAP_OWN_REFC); args.minlen = args.maxlen = args.prod = 1; + args.resv = XFS_AG_RESV_METADATA; error = xfs_alloc_vextent(&args); if (error) @@ -125,16 +128,19 @@ xfs_refcountbt_free_block( struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp)); struct xfs_owner_info oinfo; + int error; trace_xfs_refcountbt_free_block(cur->bc_mp, cur->bc_private.a.agno, XFS_FSB_TO_AGBNO(cur->bc_mp, fsbno), 1); xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_REFC); be32_add_cpu(&agf->agf_refcount_blocks, -1); xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS); - xfs_bmap_add_free(mp, cur->bc_private.a.dfops, fsbno, 1, - &oinfo); + error = xfs_free_extent(cur->bc_tp, fsbno, 1, &oinfo, + XFS_AG_RESV_METADATA); + if (error) + return error; - return 0; + return error; } STATIC int @@ -387,3 +393,59 @@ xfs_refcountbt_compute_maxlevels( mp->m_refc_maxlevels = xfs_btree_compute_maxlevels(mp, mp->m_refc_mnr, mp->m_sb.sb_agblocks); } + +/* Calculate the refcount btree size for some records. */ +xfs_extlen_t +xfs_refcountbt_calc_size( + struct xfs_mount *mp, + unsigned long long len) +{ + return xfs_btree_calc_size(mp, mp->m_refc_mnr, len); +} + +/* + * Calculate the maximum refcount btree size. + */ +xfs_extlen_t +xfs_refcountbt_max_size( + struct xfs_mount *mp) +{ + /* Bail out if we're uninitialized, which can happen in mkfs. */ + if (mp->m_refc_mxr[0] == 0) + return 0; + + return xfs_refcountbt_calc_size(mp, mp->m_sb.sb_agblocks); +} + +/* + * Figure out how many blocks to reserve and how many are used by this btree. + */ +int +xfs_refcountbt_calc_reserves( + struct xfs_mount *mp, + xfs_agnumber_t agno, + xfs_extlen_t *ask, + xfs_extlen_t *used) +{ + struct xfs_buf *agbp; + struct xfs_agf *agf; + xfs_extlen_t tree_len; + int error; + + if (!xfs_sb_version_hasreflink(&mp->m_sb)) + return 0; + + *ask += xfs_refcountbt_max_size(mp); + + error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp); + if (error) + return error; + + agf = XFS_BUF_TO_AGF(agbp); + tree_len = be32_to_cpu(agf->agf_refcount_blocks); + xfs_buf_relse(agbp); + + *used += tree_len; + + return error; +} diff --git a/fs/xfs/libxfs/xfs_refcount_btree.h b/fs/xfs/libxfs/xfs_refcount_btree.h index 9e9ad7c6d267..3be7768bd51a 100644 --- a/fs/xfs/libxfs/xfs_refcount_btree.h +++ b/fs/xfs/libxfs/xfs_refcount_btree.h @@ -64,4 +64,11 @@ extern int xfs_refcountbt_maxrecs(struct xfs_mount *mp, int blocklen, bool leaf); extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp); +extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp, + unsigned long long len); +extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp); + +extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp, + xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used); + #endif /* __XFS_REFCOUNT_BTREE_H__ */ diff --git a/fs/xfs/libxfs/xfs_rmap_btree.c b/fs/xfs/libxfs/xfs_rmap_btree.c index 9c0585e7db1f..83e672ff7577 100644 --- a/fs/xfs/libxfs/xfs_rmap_btree.c +++ b/fs/xfs/libxfs/xfs_rmap_btree.c @@ -35,6 +35,7 @@ #include "xfs_cksum.h" #include "xfs_error.h" #include "xfs_extent_busy.h" +#include "xfs_ag_resv.h" /* * Reverse map btree. @@ -533,3 +534,62 @@ xfs_rmapbt_compute_maxlevels( mp->m_rmap_maxlevels = xfs_btree_compute_maxlevels(mp, mp->m_rmap_mnr, mp->m_sb.sb_agblocks); } + +/* Calculate the refcount btree size for some records. */ +xfs_extlen_t +xfs_rmapbt_calc_size( + struct xfs_mount *mp, + unsigned long long len) +{ + return xfs_btree_calc_size(mp, mp->m_rmap_mnr, len); +} + +/* + * Calculate the maximum refcount btree size. + */ +xfs_extlen_t +xfs_rmapbt_max_size( + struct xfs_mount *mp) +{ + /* Bail out if we're uninitialized, which can happen in mkfs. */ + if (mp->m_rmap_mxr[0] == 0) + return 0; + + return xfs_rmapbt_calc_size(mp, mp->m_sb.sb_agblocks); +} + +/* + * Figure out how many blocks to reserve and how many are used by this btree. + */ +int +xfs_rmapbt_calc_reserves( + struct xfs_mount *mp, + xfs_agnumber_t agno, + xfs_extlen_t *ask, + xfs_extlen_t *used) +{ + struct xfs_buf *agbp; + struct xfs_agf *agf; + xfs_extlen_t pool_len; + xfs_extlen_t tree_len; + int error; + + if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) + return 0; + + /* Reserve 1% of the AG or enough for 1 block per record. */ + pool_len = max(mp->m_sb.sb_agblocks / 100, xfs_rmapbt_max_size(mp)); + *ask += pool_len; + + error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp); + if (error) + return error; + + agf = XFS_BUF_TO_AGF(agbp); + tree_len = be32_to_cpu(agf->agf_rmap_blocks); + xfs_buf_relse(agbp); + + *used += tree_len; + + return error; +} diff --git a/fs/xfs/libxfs/xfs_rmap_btree.h b/fs/xfs/libxfs/xfs_rmap_btree.h index e73a55357dab..2a9ac472fb15 100644 --- a/fs/xfs/libxfs/xfs_rmap_btree.h +++ b/fs/xfs/libxfs/xfs_rmap_btree.h @@ -58,4 +58,11 @@ struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp, int xfs_rmapbt_maxrecs(struct xfs_mount *mp, int blocklen, int leaf); extern void xfs_rmapbt_compute_maxlevels(struct xfs_mount *mp); +extern xfs_extlen_t xfs_rmapbt_calc_size(struct xfs_mount *mp, + unsigned long long len); +extern xfs_extlen_t xfs_rmapbt_max_size(struct xfs_mount *mp); + +extern int xfs_rmapbt_calc_reserves(struct xfs_mount *mp, + xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used); + #endif /* __XFS_RMAP_BTREE_H__ */ diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c index 3acbf4e03187..93d12fa2670d 100644 --- a/fs/xfs/xfs_fsops.c +++ b/fs/xfs/xfs_fsops.c @@ -43,6 +43,7 @@ #include "xfs_log.h" #include "xfs_filestream.h" #include "xfs_rmap.h" +#include "xfs_ag_resv.h" /* * File system operations @@ -630,6 +631,11 @@ xfs_growfs_data_private( xfs_set_low_space_thresholds(mp); mp->m_alloc_set_aside = xfs_alloc_set_aside(mp); + /* Reserve AG metadata blocks. */ + error = xfs_fs_reserve_ag_blocks(mp); + if (error && error != -ENOSPC) + goto out; + /* update secondary superblocks. */ for (agno = 1; agno < nagcount; agno++) { error = 0; @@ -680,6 +686,8 @@ xfs_growfs_data_private( continue; } } + + out: return saved_error ? saved_error : error; error0: @@ -989,3 +997,59 @@ xfs_do_force_shutdown( "Please umount the filesystem and rectify the problem(s)"); } } + +/* + * Reserve free space for per-AG metadata. + */ +int +xfs_fs_reserve_ag_blocks( + struct xfs_mount *mp) +{ + xfs_agnumber_t agno; + struct xfs_perag *pag; + int error = 0; + int err2; + + for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { + pag = xfs_perag_get(mp, agno); + err2 = xfs_ag_resv_init(pag); + xfs_perag_put(pag); + if (err2 && !error) + error = err2; + } + + if (error && error != -ENOSPC) { + xfs_warn(mp, + "Error %d reserving per-AG metadata reserve pool.", error); + xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); + } + + return error; +} + +/* + * Free space reserved for per-AG metadata. + */ +int +xfs_fs_unreserve_ag_blocks( + struct xfs_mount *mp) +{ + xfs_agnumber_t agno; + struct xfs_perag *pag; + int error = 0; + int err2; + + for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { + pag = xfs_perag_get(mp, agno); + err2 = xfs_ag_resv_free(pag); + xfs_perag_put(pag); + if (err2 && !error) + error = err2; + } + + if (error) + xfs_warn(mp, + "Error %d freeing per-AG metadata reserve pool.", error); + + return error; +} diff --git a/fs/xfs/xfs_fsops.h b/fs/xfs/xfs_fsops.h index f32713f14f9a..f34915898fea 100644 --- a/fs/xfs/xfs_fsops.h +++ b/fs/xfs/xfs_fsops.h @@ -26,4 +26,7 @@ extern int xfs_reserve_blocks(xfs_mount_t *mp, __uint64_t *inval, xfs_fsop_resblks_t *outval); extern int xfs_fs_goingdown(xfs_mount_t *mp, __uint32_t inflags); +extern int xfs_fs_reserve_ag_blocks(struct xfs_mount *mp); +extern int xfs_fs_unreserve_ag_blocks(struct xfs_mount *mp); + #endif /* __XFS_FSOPS_H__ */ diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c index 099c00ecb078..40fedc00b30d 100644 --- a/fs/xfs/xfs_mount.c +++ b/fs/xfs/xfs_mount.c @@ -995,10 +995,17 @@ xfs_mountfs( xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); goto out_quota; } + + /* Reserve AG blocks for future btree expansion. */ + error = xfs_fs_reserve_ag_blocks(mp); + if (error && error != -ENOSPC) + goto out_agresv; } return 0; + out_agresv: + xfs_fs_unreserve_ag_blocks(mp); out_quota: xfs_qm_unmount_quotas(mp); out_rtunmount: @@ -1043,6 +1050,7 @@ xfs_unmountfs( cancel_delayed_work_sync(&mp->m_eofblocks_work); + xfs_fs_unreserve_ag_blocks(mp); xfs_qm_unmount_quotas(mp); xfs_rtunmount_inodes(mp); IRELE(mp->m_rootip); diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index c32e7e61e7f3..90a8fd724abb 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1325,10 +1325,22 @@ xfs_fs_remount( xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); return error; } + + /* Create the per-AG metadata reservation pool .*/ + error = xfs_fs_reserve_ag_blocks(mp); + if (error && error != -ENOSPC) + return error; } /* rw -> ro */ if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) { + /* Free the per-AG metadata reservation pool. */ + error = xfs_fs_unreserve_ag_blocks(mp); + if (error) { + xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); + return error; + } + /* * Before we sync the metadata, we need to free up the reserve * block pool so that the used block count in the superblock on -- cgit v1.2.3-59-g8ed1b From 6fa164b865e44ac1d1ffc9a24ccd442f17acc4f6 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:45 -0700 Subject: xfs: don't allow reflink when the AG is low on space If the AG free space is down to the reserves, refuse to reflink our way out of space. Hopefully userspace will make a real copy and/or go elsewhere. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_reflink.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) (limited to 'fs') diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 8e894118295f..e92ccd316391 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -54,6 +54,8 @@ #include "xfs_reflink.h" #include "xfs_iomap.h" #include "xfs_rmap_btree.h" +#include "xfs_sb.h" +#include "xfs_ag_resv.h" /* * Copy on Write of Shared Blocks @@ -977,6 +979,31 @@ out_error: return error; } +/* + * Do we have enough reserve in this AG to handle a reflink? The refcount + * btree already reserved all the space it needs, but the rmap btree can grow + * infinitely, so we won't allow more reflinks when the AG is down to the + * btree reserves. + */ +static int +xfs_reflink_ag_has_free_space( + struct xfs_mount *mp, + xfs_agnumber_t agno) +{ + struct xfs_perag *pag; + int error = 0; + + if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) + return 0; + + pag = xfs_perag_get(mp, agno); + if (xfs_ag_resv_critical(pag, XFS_AG_RESV_AGFL) || + xfs_ag_resv_critical(pag, XFS_AG_RESV_METADATA)) + error = -ENOSPC; + xfs_perag_put(pag); + return error; +} + /* * Unmap a range of blocks from a file, then map other blocks into the hole. * The range to unmap is (destoff : destoff + srcioff + irec->br_blockcount). @@ -1009,6 +1036,14 @@ xfs_reflink_remap_extent( irec->br_startblock != DELAYSTARTBLOCK && !ISUNWRITTEN(irec)); + /* No reflinking if we're low on space */ + if (real_extent) { + error = xfs_reflink_ag_has_free_space(mp, + XFS_FSB_TO_AGNO(mp, irec->br_startblock)); + if (error) + goto out; + } + /* Start a rolling transaction to switch the mappings */ resblks = XFS_EXTENTADD_SPACE_RES(ip->i_mount, XFS_DATA_FORK); error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, &tp); -- cgit v1.2.3-59-g8ed1b From 90e2056d76adc7894a019f5289d259de58065e13 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:45 -0700 Subject: xfs: try other AGs to allocate a BMBT block Prior to the introduction of reflink, allocating a block and mapping it into a file was performed in a single transaction with a single block reservation, and the allocator was supposed to find enough blocks to allocate the extent and any BMBT blocks that might be necessary (unless we're low on space). However, due to the way copy on write works, allocation and mapping have been split into two transactions, which means that we must be able to handle the case where we allocate an extent for CoW but that AG runs out of free space before the blocks can be mapped into a file, and the mapping requires a new BMBT block. When this happens, look in one of the other AGs for a BMBT block instead of taking the FS down. The same applies to the functions that convert a data fork to extents and later btree format. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_bmap.c | 30 ++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_bmap_btree.c | 17 +++++++++++++++++ 2 files changed, 47 insertions(+) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 9702f4c112bf..c27344cf38e1 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -753,6 +753,7 @@ xfs_bmap_extents_to_btree( args.type = XFS_ALLOCTYPE_START_BNO; args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino); } else if (dfops->dop_low) { +try_another_ag: args.type = XFS_ALLOCTYPE_START_BNO; args.fsbno = *firstblock; } else { @@ -767,6 +768,21 @@ xfs_bmap_extents_to_btree( xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); return error; } + + /* + * During a CoW operation, the allocation and bmbt updates occur in + * different transactions. The mapping code tries to put new bmbt + * blocks near extents being mapped, but the only way to guarantee this + * is if the alloc and the mapping happen in a single transaction that + * has a block reservation. That isn't the case here, so if we run out + * of space we'll try again with another AG. + */ + if (xfs_sb_version_hasreflink(&cur->bc_mp->m_sb) && + args.fsbno == NULLFSBLOCK && + args.type == XFS_ALLOCTYPE_NEAR_BNO) { + dfops->dop_low = true; + goto try_another_ag; + } /* * Allocation can't fail, the space was reserved. */ @@ -902,6 +918,7 @@ xfs_bmap_local_to_extents( * file currently fits in an inode. */ if (*firstblock == NULLFSBLOCK) { +try_another_ag: args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino); args.type = XFS_ALLOCTYPE_START_BNO; } else { @@ -914,6 +931,19 @@ xfs_bmap_local_to_extents( if (error) goto done; + /* + * During a CoW operation, the allocation and bmbt updates occur in + * different transactions. The mapping code tries to put new bmbt + * blocks near extents being mapped, but the only way to guarantee this + * is if the alloc and the mapping happen in a single transaction that + * has a block reservation. That isn't the case here, so if we run out + * of space we'll try again with another AG. + */ + if (xfs_sb_version_hasreflink(&ip->i_mount->m_sb) && + args.fsbno == NULLFSBLOCK && + args.type == XFS_ALLOCTYPE_NEAR_BNO) { + goto try_another_ag; + } /* Can't fail, the space was reserved. */ ASSERT(args.fsbno != NULLFSBLOCK); ASSERT(args.len == 1); diff --git a/fs/xfs/libxfs/xfs_bmap_btree.c b/fs/xfs/libxfs/xfs_bmap_btree.c index 37f0d9daafce..8007d2ba9aef 100644 --- a/fs/xfs/libxfs/xfs_bmap_btree.c +++ b/fs/xfs/libxfs/xfs_bmap_btree.c @@ -453,6 +453,7 @@ xfs_bmbt_alloc_block( if (args.fsbno == NULLFSBLOCK) { args.fsbno = be64_to_cpu(start->l); +try_another_ag: args.type = XFS_ALLOCTYPE_START_BNO; /* * Make sure there is sufficient room left in the AG to @@ -482,6 +483,22 @@ xfs_bmbt_alloc_block( if (error) goto error0; + /* + * During a CoW operation, the allocation and bmbt updates occur in + * different transactions. The mapping code tries to put new bmbt + * blocks near extents being mapped, but the only way to guarantee this + * is if the alloc and the mapping happen in a single transaction that + * has a block reservation. That isn't the case here, so if we run out + * of space we'll try again with another AG. + */ + if (xfs_sb_version_hasreflink(&cur->bc_mp->m_sb) && + args.fsbno == NULLFSBLOCK && + args.type == XFS_ALLOCTYPE_NEAR_BNO) { + cur->bc_private.b.dfops->dop_low = true; + args.fsbno = cur->bc_private.b.firstblock; + goto try_another_ag; + } + if (args.fsbno == NULLFSBLOCK && args.minleft) { /* * Could not find an AG with enough free space to satisfy -- cgit v1.2.3-59-g8ed1b From 83104d449e8c44e4870a795132437257cdf80006 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:46 -0700 Subject: xfs: garbage collect old cowextsz reservations Trim CoW reservations made on behalf of a cowextsz hint if they get too old or we run low on quota, so long as we don't have dirty data awaiting writeback or directio operations in progress. Garbage collection of the cowextsize extents are kept separate from prealloc extent reaping because setting the CoW prealloc lifetime to a (much) higher value than the regular prealloc extent lifetime has been useful for combatting CoW fragmentation on VM hosts where the VMs experience bursty write behaviors and we can keep the utilization ratios low enough that we don't start to run out of space. IOWs, it benefits us to keep the CoW fork reservations around for as long as we can unless we run out of blocks or hit inode reclaim. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_bmap_util.c | 2 + fs/xfs/xfs_file.c | 3 + fs/xfs/xfs_globals.c | 5 +- fs/xfs/xfs_icache.c | 238 +++++++++++++++++++++++++++++++++++++++++++------ fs/xfs/xfs_icache.h | 7 ++ fs/xfs/xfs_inode.c | 4 +- fs/xfs/xfs_linux.h | 1 + fs/xfs/xfs_mount.c | 1 + fs/xfs/xfs_mount.h | 2 + fs/xfs/xfs_reflink.c | 38 ++++++++ fs/xfs/xfs_reflink.h | 2 + fs/xfs/xfs_super.c | 1 + fs/xfs/xfs_sysctl.c | 9 ++ fs/xfs/xfs_sysctl.h | 1 + fs/xfs/xfs_trace.h | 5 ++ 15 files changed, 287 insertions(+), 32 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index 4a807f05e460..eacd4c203376 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -1891,6 +1891,8 @@ xfs_swap_extents( cowfp = ip->i_cowfp; ip->i_cowfp = tip->i_cowfp; tip->i_cowfp = cowfp; + xfs_inode_set_cowblocks_tag(ip); + xfs_inode_set_cowblocks_tag(tip); } xfs_trans_log_inode(tp, ip, src_log_flags); diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 07f951dd2685..0726df88bce2 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -782,6 +782,9 @@ write_retry: enospc = xfs_inode_free_quota_eofblocks(ip); if (enospc) goto write_retry; + enospc = xfs_inode_free_quota_cowblocks(ip); + if (enospc) + goto write_retry; } else if (ret == -ENOSPC && !enospc) { struct xfs_eofblocks eofb = {0}; diff --git a/fs/xfs/xfs_globals.c b/fs/xfs/xfs_globals.c index 4d41b241298f..687a4b01fc53 100644 --- a/fs/xfs/xfs_globals.c +++ b/fs/xfs/xfs_globals.c @@ -21,8 +21,8 @@ /* * Tunable XFS parameters. xfs_params is required even when CONFIG_SYSCTL=n, * other XFS code uses these values. Times are measured in centisecs (i.e. - * 100ths of a second) with the exception of eofb_timer, which is measured in - * seconds. + * 100ths of a second) with the exception of eofb_timer and cowb_timer, which + * are measured in seconds. */ xfs_param_t xfs_params = { /* MIN DFLT MAX */ @@ -42,6 +42,7 @@ xfs_param_t xfs_params = { .inherit_nodfrg = { 0, 1, 1 }, .fstrm_timer = { 1, 30*100, 3600*100}, .eofb_timer = { 1, 300, 3600*24}, + .cowb_timer = { 1, 1800, 3600*24}, }; struct xfs_globals xfs_globals = { diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c index 2d3de02f3529..14796b744e0a 100644 --- a/fs/xfs/xfs_icache.c +++ b/fs/xfs/xfs_icache.c @@ -33,6 +33,7 @@ #include "xfs_bmap_util.h" #include "xfs_dquot_item.h" #include "xfs_dquot.h" +#include "xfs_reflink.h" #include #include @@ -792,6 +793,33 @@ xfs_eofblocks_worker( xfs_queue_eofblocks(mp); } +/* + * Background scanning to trim preallocated CoW space. This is queued + * based on the 'speculative_cow_prealloc_lifetime' tunable (5m by default). + * (We'll just piggyback on the post-EOF prealloc space workqueue.) + */ +STATIC void +xfs_queue_cowblocks( + struct xfs_mount *mp) +{ + rcu_read_lock(); + if (radix_tree_tagged(&mp->m_perag_tree, XFS_ICI_COWBLOCKS_TAG)) + queue_delayed_work(mp->m_eofblocks_workqueue, + &mp->m_cowblocks_work, + msecs_to_jiffies(xfs_cowb_secs * 1000)); + rcu_read_unlock(); +} + +void +xfs_cowblocks_worker( + struct work_struct *work) +{ + struct xfs_mount *mp = container_of(to_delayed_work(work), + struct xfs_mount, m_cowblocks_work); + xfs_icache_free_cowblocks(mp, NULL); + xfs_queue_cowblocks(mp); +} + int xfs_inode_ag_iterator( struct xfs_mount *mp, @@ -1348,18 +1376,30 @@ xfs_inode_free_eofblocks( return ret; } -int -xfs_icache_free_eofblocks( +static int +__xfs_icache_free_eofblocks( struct xfs_mount *mp, - struct xfs_eofblocks *eofb) + struct xfs_eofblocks *eofb, + int (*execute)(struct xfs_inode *ip, int flags, + void *args), + int tag) { int flags = SYNC_TRYLOCK; if (eofb && (eofb->eof_flags & XFS_EOF_FLAGS_SYNC)) flags = SYNC_WAIT; - return xfs_inode_ag_iterator_tag(mp, xfs_inode_free_eofblocks, flags, - eofb, XFS_ICI_EOFBLOCKS_TAG); + return xfs_inode_ag_iterator_tag(mp, execute, flags, + eofb, tag); +} + +int +xfs_icache_free_eofblocks( + struct xfs_mount *mp, + struct xfs_eofblocks *eofb) +{ + return __xfs_icache_free_eofblocks(mp, eofb, xfs_inode_free_eofblocks, + XFS_ICI_EOFBLOCKS_TAG); } /* @@ -1368,9 +1408,11 @@ xfs_icache_free_eofblocks( * failure. We make a best effort by including each quota under low free space * conditions (less than 1% free space) in the scan. */ -int -xfs_inode_free_quota_eofblocks( - struct xfs_inode *ip) +static int +__xfs_inode_free_quota_eofblocks( + struct xfs_inode *ip, + int (*execute)(struct xfs_mount *mp, + struct xfs_eofblocks *eofb)) { int scan = 0; struct xfs_eofblocks eofb = {0}; @@ -1406,14 +1448,25 @@ xfs_inode_free_quota_eofblocks( } if (scan) - xfs_icache_free_eofblocks(ip->i_mount, &eofb); + execute(ip->i_mount, &eofb); return scan; } -void -xfs_inode_set_eofblocks_tag( - xfs_inode_t *ip) +int +xfs_inode_free_quota_eofblocks( + struct xfs_inode *ip) +{ + return __xfs_inode_free_quota_eofblocks(ip, xfs_icache_free_eofblocks); +} + +static void +__xfs_inode_set_eofblocks_tag( + xfs_inode_t *ip, + void (*execute)(struct xfs_mount *mp), + void (*set_tp)(struct xfs_mount *mp, xfs_agnumber_t agno, + int error, unsigned long caller_ip), + int tag) { struct xfs_mount *mp = ip->i_mount; struct xfs_perag *pag; @@ -1431,26 +1484,22 @@ xfs_inode_set_eofblocks_tag( pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino)); spin_lock(&pag->pag_ici_lock); - trace_xfs_inode_set_eofblocks_tag(ip); - tagged = radix_tree_tagged(&pag->pag_ici_root, - XFS_ICI_EOFBLOCKS_TAG); + tagged = radix_tree_tagged(&pag->pag_ici_root, tag); radix_tree_tag_set(&pag->pag_ici_root, - XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino), - XFS_ICI_EOFBLOCKS_TAG); + XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino), tag); if (!tagged) { /* propagate the eofblocks tag up into the perag radix tree */ spin_lock(&ip->i_mount->m_perag_lock); radix_tree_tag_set(&ip->i_mount->m_perag_tree, XFS_INO_TO_AGNO(ip->i_mount, ip->i_ino), - XFS_ICI_EOFBLOCKS_TAG); + tag); spin_unlock(&ip->i_mount->m_perag_lock); /* kick off background trimming */ - xfs_queue_eofblocks(ip->i_mount); + execute(ip->i_mount); - trace_xfs_perag_set_eofblocks(ip->i_mount, pag->pag_agno, - -1, _RET_IP_); + set_tp(ip->i_mount, pag->pag_agno, -1, _RET_IP_); } spin_unlock(&pag->pag_ici_lock); @@ -1458,8 +1507,21 @@ xfs_inode_set_eofblocks_tag( } void -xfs_inode_clear_eofblocks_tag( +xfs_inode_set_eofblocks_tag( xfs_inode_t *ip) +{ + trace_xfs_inode_set_eofblocks_tag(ip); + return __xfs_inode_set_eofblocks_tag(ip, xfs_queue_eofblocks, + trace_xfs_perag_set_eofblocks, + XFS_ICI_EOFBLOCKS_TAG); +} + +static void +__xfs_inode_clear_eofblocks_tag( + xfs_inode_t *ip, + void (*clear_tp)(struct xfs_mount *mp, xfs_agnumber_t agno, + int error, unsigned long caller_ip), + int tag) { struct xfs_mount *mp = ip->i_mount; struct xfs_perag *pag; @@ -1470,23 +1532,141 @@ xfs_inode_clear_eofblocks_tag( pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino)); spin_lock(&pag->pag_ici_lock); - trace_xfs_inode_clear_eofblocks_tag(ip); radix_tree_tag_clear(&pag->pag_ici_root, - XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino), - XFS_ICI_EOFBLOCKS_TAG); - if (!radix_tree_tagged(&pag->pag_ici_root, XFS_ICI_EOFBLOCKS_TAG)) { + XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino), tag); + if (!radix_tree_tagged(&pag->pag_ici_root, tag)) { /* clear the eofblocks tag from the perag radix tree */ spin_lock(&ip->i_mount->m_perag_lock); radix_tree_tag_clear(&ip->i_mount->m_perag_tree, XFS_INO_TO_AGNO(ip->i_mount, ip->i_ino), - XFS_ICI_EOFBLOCKS_TAG); + tag); spin_unlock(&ip->i_mount->m_perag_lock); - trace_xfs_perag_clear_eofblocks(ip->i_mount, pag->pag_agno, - -1, _RET_IP_); + clear_tp(ip->i_mount, pag->pag_agno, -1, _RET_IP_); } spin_unlock(&pag->pag_ici_lock); xfs_perag_put(pag); } +void +xfs_inode_clear_eofblocks_tag( + xfs_inode_t *ip) +{ + trace_xfs_inode_clear_eofblocks_tag(ip); + return __xfs_inode_clear_eofblocks_tag(ip, + trace_xfs_perag_clear_eofblocks, XFS_ICI_EOFBLOCKS_TAG); +} + +/* + * Automatic CoW Reservation Freeing + * + * These functions automatically garbage collect leftover CoW reservations + * that were made on behalf of a cowextsize hint when we start to run out + * of quota or when the reservations sit around for too long. If the file + * has dirty pages or is undergoing writeback, its CoW reservations will + * be retained. + * + * The actual garbage collection piggybacks off the same code that runs + * the speculative EOF preallocation garbage collector. + */ +STATIC int +xfs_inode_free_cowblocks( + struct xfs_inode *ip, + int flags, + void *args) +{ + int ret; + struct xfs_eofblocks *eofb = args; + bool need_iolock = true; + int match; + + ASSERT(!eofb || (eofb && eofb->eof_scan_owner != 0)); + + if (!xfs_reflink_has_real_cow_blocks(ip)) { + trace_xfs_inode_free_cowblocks_invalid(ip); + xfs_inode_clear_cowblocks_tag(ip); + return 0; + } + + /* + * If the mapping is dirty or under writeback we cannot touch the + * CoW fork. Leave it alone if we're in the midst of a directio. + */ + if (mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_DIRTY) || + mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_WRITEBACK) || + atomic_read(&VFS_I(ip)->i_dio_count)) + return 0; + + if (eofb) { + if (eofb->eof_flags & XFS_EOF_FLAGS_UNION) + match = xfs_inode_match_id_union(ip, eofb); + else + match = xfs_inode_match_id(ip, eofb); + if (!match) + return 0; + + /* skip the inode if the file size is too small */ + if (eofb->eof_flags & XFS_EOF_FLAGS_MINFILESIZE && + XFS_ISIZE(ip) < eofb->eof_min_file_size) + return 0; + + /* + * A scan owner implies we already hold the iolock. Skip it in + * xfs_free_eofblocks() to avoid deadlock. This also eliminates + * the possibility of EAGAIN being returned. + */ + if (eofb->eof_scan_owner == ip->i_ino) + need_iolock = false; + } + + /* Free the CoW blocks */ + if (need_iolock) { + xfs_ilock(ip, XFS_IOLOCK_EXCL); + xfs_ilock(ip, XFS_MMAPLOCK_EXCL); + } + + ret = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF); + + if (need_iolock) { + xfs_iunlock(ip, XFS_MMAPLOCK_EXCL); + xfs_iunlock(ip, XFS_IOLOCK_EXCL); + } + + return ret; +} + +int +xfs_icache_free_cowblocks( + struct xfs_mount *mp, + struct xfs_eofblocks *eofb) +{ + return __xfs_icache_free_eofblocks(mp, eofb, xfs_inode_free_cowblocks, + XFS_ICI_COWBLOCKS_TAG); +} + +int +xfs_inode_free_quota_cowblocks( + struct xfs_inode *ip) +{ + return __xfs_inode_free_quota_eofblocks(ip, xfs_icache_free_cowblocks); +} + +void +xfs_inode_set_cowblocks_tag( + xfs_inode_t *ip) +{ + trace_xfs_inode_set_eofblocks_tag(ip); + return __xfs_inode_set_eofblocks_tag(ip, xfs_queue_cowblocks, + trace_xfs_perag_set_eofblocks, + XFS_ICI_COWBLOCKS_TAG); +} + +void +xfs_inode_clear_cowblocks_tag( + xfs_inode_t *ip) +{ + trace_xfs_inode_clear_eofblocks_tag(ip); + return __xfs_inode_clear_eofblocks_tag(ip, + trace_xfs_perag_clear_eofblocks, XFS_ICI_COWBLOCKS_TAG); +} diff --git a/fs/xfs/xfs_icache.h b/fs/xfs/xfs_icache.h index 05bac99bef75..a1e02f4708ab 100644 --- a/fs/xfs/xfs_icache.h +++ b/fs/xfs/xfs_icache.h @@ -40,6 +40,7 @@ struct xfs_eofblocks { in xfs_inode_ag_iterator */ #define XFS_ICI_RECLAIM_TAG 0 /* inode is to be reclaimed */ #define XFS_ICI_EOFBLOCKS_TAG 1 /* inode has blocks beyond EOF */ +#define XFS_ICI_COWBLOCKS_TAG 2 /* inode can have cow blocks to gc */ /* * Flags for xfs_iget() @@ -70,6 +71,12 @@ int xfs_inode_free_quota_eofblocks(struct xfs_inode *ip); void xfs_eofblocks_worker(struct work_struct *); void xfs_queue_eofblocks(struct xfs_mount *); +void xfs_inode_set_cowblocks_tag(struct xfs_inode *ip); +void xfs_inode_clear_cowblocks_tag(struct xfs_inode *ip); +int xfs_icache_free_cowblocks(struct xfs_mount *, struct xfs_eofblocks *); +int xfs_inode_free_quota_cowblocks(struct xfs_inode *ip); +void xfs_cowblocks_worker(struct work_struct *); + int xfs_inode_ag_iterator(struct xfs_mount *mp, int (*execute)(struct xfs_inode *ip, int flags, void *args), int flags, void *args); diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index 09640bdd3e44..89e6441f963f 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -1629,8 +1629,10 @@ xfs_itruncate_extents( /* * Clear the reflink flag if we truncated everything. */ - if (ip->i_d.di_nblocks == 0 && xfs_is_reflink_inode(ip)) + if (ip->i_d.di_nblocks == 0 && xfs_is_reflink_inode(ip)) { ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK; + xfs_inode_clear_cowblocks_tag(ip); + } /* * Always re-log the inode so that our permanent transaction can keep diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h index b8d64d520e12..68640fb63a54 100644 --- a/fs/xfs/xfs_linux.h +++ b/fs/xfs/xfs_linux.h @@ -116,6 +116,7 @@ typedef __u32 xfs_nlink_t; #define xfs_inherit_nodefrag xfs_params.inherit_nodfrg.val #define xfs_fstrm_centisecs xfs_params.fstrm_timer.val #define xfs_eofb_secs xfs_params.eofb_timer.val +#define xfs_cowb_secs xfs_params.cowb_timer.val #define current_cpu() (raw_smp_processor_id()) #define current_pid() (current->pid) diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c index 40fedc00b30d..fc7873942bea 100644 --- a/fs/xfs/xfs_mount.c +++ b/fs/xfs/xfs_mount.c @@ -1049,6 +1049,7 @@ xfs_unmountfs( int error; cancel_delayed_work_sync(&mp->m_eofblocks_work); + cancel_delayed_work_sync(&mp->m_cowblocks_work); xfs_fs_unreserve_ag_blocks(mp); xfs_qm_unmount_quotas(mp); diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h index 0be14a76216a..819b80b15bfb 100644 --- a/fs/xfs/xfs_mount.h +++ b/fs/xfs/xfs_mount.h @@ -164,6 +164,8 @@ typedef struct xfs_mount { struct delayed_work m_reclaim_work; /* background inode reclaim */ struct delayed_work m_eofblocks_work; /* background eof blocks trimming */ + struct delayed_work m_cowblocks_work; /* background cow blocks + trimming */ bool m_update_sb; /* sb needs update in mount */ int64_t m_low_space[XFS_LOWSP_MAX]; /* low free space thresholds */ diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index e92ccd316391..685c419ae011 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -304,6 +304,9 @@ retry: goto out_unlock; } + if (end_fsb != orig_end_fsb) + xfs_inode_set_cowblocks_tag(ip); + trace_xfs_reflink_cow_alloc(ip, &got); done: *offset_fsb = end_fsb; @@ -1562,6 +1565,7 @@ next: /* Clear the inode flag. */ trace_xfs_reflink_unset_inode_flag(ip); ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK; + xfs_inode_clear_cowblocks_tag(ip); xfs_trans_ijoin(*tpp, ip, 0); xfs_trans_log_inode(*tpp, ip, XFS_ILOG_CORE); @@ -1662,3 +1666,37 @@ out: trace_xfs_reflink_unshare_error(ip, error, _RET_IP_); return error; } + +/* + * Does this inode have any real CoW reservations? + */ +bool +xfs_reflink_has_real_cow_blocks( + struct xfs_inode *ip) +{ + struct xfs_bmbt_irec irec; + struct xfs_ifork *ifp; + struct xfs_bmbt_rec_host *gotp; + xfs_extnum_t idx; + + if (!xfs_is_reflink_inode(ip)) + return false; + + /* Go find the old extent in the CoW fork. */ + ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK); + gotp = xfs_iext_bno_to_ext(ifp, 0, &idx); + while (gotp) { + xfs_bmbt_get_all(gotp, &irec); + + if (!isnullstartblock(irec.br_startblock)) + return true; + + /* Roll on... */ + idx++; + if (idx >= ifp->if_bytes / sizeof(xfs_bmbt_rec_t)) + break; + gotp = xfs_iext_get_ext(ifp, idx); + } + + return false; +} diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h index bade5a61f3b0..5dc3c8ac12aa 100644 --- a/fs/xfs/xfs_reflink.h +++ b/fs/xfs/xfs_reflink.h @@ -53,4 +53,6 @@ extern int xfs_reflink_clear_inode_flag(struct xfs_inode *ip, extern int xfs_reflink_unshare(struct xfs_inode *ip, xfs_off_t offset, xfs_off_t len); +extern bool xfs_reflink_has_real_cow_blocks(struct xfs_inode *ip); + #endif /* __XFS_REFLINK_H */ diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 90a8fd724abb..15b9fcd16c67 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1531,6 +1531,7 @@ xfs_fs_fill_super( atomic_set(&mp->m_active_trans, 0); INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker); INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker); + INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker); mp->m_kobj.kobject.kset = xfs_kset; mp->m_super = sb; diff --git a/fs/xfs/xfs_sysctl.c b/fs/xfs/xfs_sysctl.c index aed74d3f8da9..afe1f66aaa69 100644 --- a/fs/xfs/xfs_sysctl.c +++ b/fs/xfs/xfs_sysctl.c @@ -184,6 +184,15 @@ static struct ctl_table xfs_table[] = { .extra1 = &xfs_params.eofb_timer.min, .extra2 = &xfs_params.eofb_timer.max, }, + { + .procname = "speculative_cow_prealloc_lifetime", + .data = &xfs_params.cowb_timer.val, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &xfs_params.cowb_timer.min, + .extra2 = &xfs_params.cowb_timer.max, + }, /* please keep this the last entry */ #ifdef CONFIG_PROC_FS { diff --git a/fs/xfs/xfs_sysctl.h b/fs/xfs/xfs_sysctl.h index ffef45375754..984a3499cfe3 100644 --- a/fs/xfs/xfs_sysctl.h +++ b/fs/xfs/xfs_sysctl.h @@ -48,6 +48,7 @@ typedef struct xfs_param { xfs_sysctl_val_t inherit_nodfrg;/* Inherit the "nodefrag" inode flag. */ xfs_sysctl_val_t fstrm_timer; /* Filestream dir-AG assoc'n timeout. */ xfs_sysctl_val_t eofb_timer; /* Interval between eofb scan wakeups */ + xfs_sysctl_val_t cowb_timer; /* Interval between cowb scan wakeups */ } xfs_param_t; /* diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 5c10b12170d0..263dab10c982 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -136,6 +136,8 @@ DEFINE_PERAG_REF_EVENT(xfs_perag_set_reclaim); DEFINE_PERAG_REF_EVENT(xfs_perag_clear_reclaim); DEFINE_PERAG_REF_EVENT(xfs_perag_set_eofblocks); DEFINE_PERAG_REF_EVENT(xfs_perag_clear_eofblocks); +DEFINE_PERAG_REF_EVENT(xfs_perag_set_cowblocks); +DEFINE_PERAG_REF_EVENT(xfs_perag_clear_cowblocks); DECLARE_EVENT_CLASS(xfs_ag_class, TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno), @@ -687,6 +689,9 @@ DEFINE_INODE_EVENT(xfs_dquot_dqdetach); DEFINE_INODE_EVENT(xfs_inode_set_eofblocks_tag); DEFINE_INODE_EVENT(xfs_inode_clear_eofblocks_tag); DEFINE_INODE_EVENT(xfs_inode_free_eofblocks_invalid); +DEFINE_INODE_EVENT(xfs_inode_set_cowblocks_tag); +DEFINE_INODE_EVENT(xfs_inode_clear_cowblocks_tag); +DEFINE_INODE_EVENT(xfs_inode_free_cowblocks_invalid); DEFINE_INODE_EVENT(xfs_filemap_fault); DEFINE_INODE_EVENT(xfs_filemap_pmd_fault); -- cgit v1.2.3-59-g8ed1b From 80de462e090c2c346ca6ec6344b326e81e8cef84 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:47 -0700 Subject: xfs: increase log reservations for reflink Increase the log reservations to handle the increased rolling that happens at the end of copy-on-write operations. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_trans_resv.c | 16 +++++++++++++--- fs/xfs/libxfs/xfs_trans_resv.h | 2 ++ 2 files changed, 15 insertions(+), 3 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_trans_resv.c b/fs/xfs/libxfs/xfs_trans_resv.c index a59838f1627b..b456cca1bfb2 100644 --- a/fs/xfs/libxfs/xfs_trans_resv.c +++ b/fs/xfs/libxfs/xfs_trans_resv.c @@ -812,11 +812,18 @@ xfs_trans_resv_calc( * require a permanent reservation on space. */ resp->tr_write.tr_logres = xfs_calc_write_reservation(mp); - resp->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT; + if (xfs_sb_version_hasreflink(&mp->m_sb)) + resp->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT_REFLINK; + else + resp->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT; resp->tr_write.tr_logflags |= XFS_TRANS_PERM_LOG_RES; resp->tr_itruncate.tr_logres = xfs_calc_itruncate_reservation(mp); - resp->tr_itruncate.tr_logcount = XFS_ITRUNCATE_LOG_COUNT; + if (xfs_sb_version_hasreflink(&mp->m_sb)) + resp->tr_itruncate.tr_logcount = + XFS_ITRUNCATE_LOG_COUNT_REFLINK; + else + resp->tr_itruncate.tr_logcount = XFS_ITRUNCATE_LOG_COUNT; resp->tr_itruncate.tr_logflags |= XFS_TRANS_PERM_LOG_RES; resp->tr_rename.tr_logres = xfs_calc_rename_reservation(mp); @@ -873,7 +880,10 @@ xfs_trans_resv_calc( resp->tr_growrtalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES; resp->tr_qm_dqalloc.tr_logres = xfs_calc_qm_dqalloc_reservation(mp); - resp->tr_qm_dqalloc.tr_logcount = XFS_WRITE_LOG_COUNT; + if (xfs_sb_version_hasreflink(&mp->m_sb)) + resp->tr_qm_dqalloc.tr_logcount = XFS_WRITE_LOG_COUNT_REFLINK; + else + resp->tr_qm_dqalloc.tr_logcount = XFS_WRITE_LOG_COUNT; resp->tr_qm_dqalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES; /* diff --git a/fs/xfs/libxfs/xfs_trans_resv.h b/fs/xfs/libxfs/xfs_trans_resv.h index 36a15110c1fe..b7e5357d060a 100644 --- a/fs/xfs/libxfs/xfs_trans_resv.h +++ b/fs/xfs/libxfs/xfs_trans_resv.h @@ -87,6 +87,7 @@ struct xfs_trans_resv { #define XFS_DEFAULT_LOG_COUNT 1 #define XFS_DEFAULT_PERM_LOG_COUNT 2 #define XFS_ITRUNCATE_LOG_COUNT 2 +#define XFS_ITRUNCATE_LOG_COUNT_REFLINK 8 #define XFS_INACTIVE_LOG_COUNT 2 #define XFS_CREATE_LOG_COUNT 2 #define XFS_CREATE_TMPFILE_LOG_COUNT 2 @@ -96,6 +97,7 @@ struct xfs_trans_resv { #define XFS_LINK_LOG_COUNT 2 #define XFS_RENAME_LOG_COUNT 2 #define XFS_WRITE_LOG_COUNT 2 +#define XFS_WRITE_LOG_COUNT_REFLINK 8 #define XFS_ADDAFORK_LOG_COUNT 2 #define XFS_ATTRINVAL_LOG_COUNT 1 #define XFS_ATTRSET_LOG_COUNT 3 -- cgit v1.2.3-59-g8ed1b From 0e07c039bac5f6ce7e3bc512ab9efb4aaa76da94 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:47 -0700 Subject: xfs: add shared rmap map/unmap/convert log item types Wire up some rmap log redo item type codes to map, unmap, or convert shared data block extents. The actual log item recovery comes in a later patch. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_log_format.h | 3 +++ fs/xfs/xfs_rmap_item.c | 3 +++ fs/xfs/xfs_trans_rmap.c | 9 +++++++++ 3 files changed, 15 insertions(+) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_log_format.h b/fs/xfs/libxfs/xfs_log_format.h index 364ce6fcc213..083cdd6d6c28 100644 --- a/fs/xfs/libxfs/xfs_log_format.h +++ b/fs/xfs/libxfs/xfs_log_format.h @@ -635,8 +635,11 @@ struct xfs_map_extent { /* rmap me_flags: upper bits are flags, lower byte is type code */ #define XFS_RMAP_EXTENT_MAP 1 +#define XFS_RMAP_EXTENT_MAP_SHARED 2 #define XFS_RMAP_EXTENT_UNMAP 3 +#define XFS_RMAP_EXTENT_UNMAP_SHARED 4 #define XFS_RMAP_EXTENT_CONVERT 5 +#define XFS_RMAP_EXTENT_CONVERT_SHARED 6 #define XFS_RMAP_EXTENT_ALLOC 7 #define XFS_RMAP_EXTENT_FREE 8 #define XFS_RMAP_EXTENT_TYPE_MASK 0xFF diff --git a/fs/xfs/xfs_rmap_item.c b/fs/xfs/xfs_rmap_item.c index 0432a459871c..19d817e3e1d9 100644 --- a/fs/xfs/xfs_rmap_item.c +++ b/fs/xfs/xfs_rmap_item.c @@ -441,8 +441,11 @@ xfs_rui_recover( XFS_FSB_TO_DADDR(mp, rmap->me_startblock)); switch (rmap->me_flags & XFS_RMAP_EXTENT_TYPE_MASK) { case XFS_RMAP_EXTENT_MAP: + case XFS_RMAP_EXTENT_MAP_SHARED: case XFS_RMAP_EXTENT_UNMAP: + case XFS_RMAP_EXTENT_UNMAP_SHARED: case XFS_RMAP_EXTENT_CONVERT: + case XFS_RMAP_EXTENT_CONVERT_SHARED: case XFS_RMAP_EXTENT_ALLOC: case XFS_RMAP_EXTENT_FREE: op_ok = true; diff --git a/fs/xfs/xfs_trans_rmap.c b/fs/xfs/xfs_trans_rmap.c index 5a50ef881568..9ead064b5e90 100644 --- a/fs/xfs/xfs_trans_rmap.c +++ b/fs/xfs/xfs_trans_rmap.c @@ -48,12 +48,21 @@ xfs_trans_set_rmap_flags( case XFS_RMAP_MAP: rmap->me_flags |= XFS_RMAP_EXTENT_MAP; break; + case XFS_RMAP_MAP_SHARED: + rmap->me_flags |= XFS_RMAP_EXTENT_MAP_SHARED; + break; case XFS_RMAP_UNMAP: rmap->me_flags |= XFS_RMAP_EXTENT_UNMAP; break; + case XFS_RMAP_UNMAP_SHARED: + rmap->me_flags |= XFS_RMAP_EXTENT_UNMAP_SHARED; + break; case XFS_RMAP_CONVERT: rmap->me_flags |= XFS_RMAP_EXTENT_CONVERT; break; + case XFS_RMAP_CONVERT_SHARED: + rmap->me_flags |= XFS_RMAP_EXTENT_CONVERT_SHARED; + break; case XFS_RMAP_ALLOC: rmap->me_flags |= XFS_RMAP_EXTENT_ALLOC; break; -- cgit v1.2.3-59-g8ed1b From ceeb9c832eeca5c1c2efc54a38f67283ccb60288 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:48 -0700 Subject: xfs: use interval query for rmap alloc operations on shared files When it's possible for reverse mappings to overlap (data fork extents of files on reflink filesystems), use the interval query function to find the left neighbor of an extent we're trying to add; and be careful to use the lookup functions to update the neighbors and/or add new extents. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_rmap.c | 514 ++++++++++++++++++++++++++++++++++++++++++++++- fs/xfs/libxfs/xfs_rmap.h | 7 + fs/xfs/xfs_rmap_item.c | 6 + fs/xfs/xfs_trace.h | 5 + 4 files changed, 530 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_rmap.c b/fs/xfs/libxfs/xfs_rmap.c index 1c40b851a21d..bb5e2f840370 100644 --- a/fs/xfs/libxfs/xfs_rmap.c +++ b/fs/xfs/libxfs/xfs_rmap.c @@ -148,6 +148,37 @@ done: return error; } +STATIC int +xfs_rmap_delete( + struct xfs_btree_cur *rcur, + xfs_agblock_t agbno, + xfs_extlen_t len, + uint64_t owner, + uint64_t offset, + unsigned int flags) +{ + int i; + int error; + + trace_xfs_rmap_delete(rcur->bc_mp, rcur->bc_private.a.agno, agbno, + len, owner, offset, flags); + + error = xfs_rmap_lookup_eq(rcur, agbno, len, owner, offset, flags, &i); + if (error) + goto done; + XFS_WANT_CORRUPTED_GOTO(rcur->bc_mp, i == 1, done); + + error = xfs_btree_delete(rcur, &i); + if (error) + goto done; + XFS_WANT_CORRUPTED_GOTO(rcur->bc_mp, i == 1, done); +done: + if (error) + trace_xfs_rmap_delete_error(rcur->bc_mp, + rcur->bc_private.a.agno, error, _RET_IP_); + return error; +} + static int xfs_rmap_btrec_to_irec( union xfs_btree_rec *rec, @@ -180,6 +211,160 @@ xfs_rmap_get_rec( return xfs_rmap_btrec_to_irec(rec, irec); } +struct xfs_find_left_neighbor_info { + struct xfs_rmap_irec high; + struct xfs_rmap_irec *irec; + int *stat; +}; + +/* For each rmap given, figure out if it matches the key we want. */ +STATIC int +xfs_rmap_find_left_neighbor_helper( + struct xfs_btree_cur *cur, + struct xfs_rmap_irec *rec, + void *priv) +{ + struct xfs_find_left_neighbor_info *info = priv; + + trace_xfs_rmap_find_left_neighbor_candidate(cur->bc_mp, + cur->bc_private.a.agno, rec->rm_startblock, + rec->rm_blockcount, rec->rm_owner, rec->rm_offset, + rec->rm_flags); + + if (rec->rm_owner != info->high.rm_owner) + return XFS_BTREE_QUERY_RANGE_CONTINUE; + if (!XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) && + !(rec->rm_flags & XFS_RMAP_BMBT_BLOCK) && + rec->rm_offset + rec->rm_blockcount - 1 != info->high.rm_offset) + return XFS_BTREE_QUERY_RANGE_CONTINUE; + + *info->irec = *rec; + *info->stat = 1; + return XFS_BTREE_QUERY_RANGE_ABORT; +} + +/* + * Find the record to the left of the given extent, being careful only to + * return a match with the same owner and adjacent physical and logical + * block ranges. + */ +int +xfs_rmap_find_left_neighbor( + struct xfs_btree_cur *cur, + xfs_agblock_t bno, + uint64_t owner, + uint64_t offset, + unsigned int flags, + struct xfs_rmap_irec *irec, + int *stat) +{ + struct xfs_find_left_neighbor_info info; + int error; + + *stat = 0; + if (bno == 0) + return 0; + info.high.rm_startblock = bno - 1; + info.high.rm_owner = owner; + if (!XFS_RMAP_NON_INODE_OWNER(owner) && + !(flags & XFS_RMAP_BMBT_BLOCK)) { + if (offset == 0) + return 0; + info.high.rm_offset = offset - 1; + } else + info.high.rm_offset = 0; + info.high.rm_flags = flags; + info.high.rm_blockcount = 0; + info.irec = irec; + info.stat = stat; + + trace_xfs_rmap_find_left_neighbor_query(cur->bc_mp, + cur->bc_private.a.agno, bno, 0, owner, offset, flags); + + error = xfs_rmap_query_range(cur, &info.high, &info.high, + xfs_rmap_find_left_neighbor_helper, &info); + if (error == XFS_BTREE_QUERY_RANGE_ABORT) + error = 0; + if (*stat) + trace_xfs_rmap_find_left_neighbor_result(cur->bc_mp, + cur->bc_private.a.agno, irec->rm_startblock, + irec->rm_blockcount, irec->rm_owner, + irec->rm_offset, irec->rm_flags); + return error; +} + +/* For each rmap given, figure out if it matches the key we want. */ +STATIC int +xfs_rmap_lookup_le_range_helper( + struct xfs_btree_cur *cur, + struct xfs_rmap_irec *rec, + void *priv) +{ + struct xfs_find_left_neighbor_info *info = priv; + + trace_xfs_rmap_lookup_le_range_candidate(cur->bc_mp, + cur->bc_private.a.agno, rec->rm_startblock, + rec->rm_blockcount, rec->rm_owner, rec->rm_offset, + rec->rm_flags); + + if (rec->rm_owner != info->high.rm_owner) + return XFS_BTREE_QUERY_RANGE_CONTINUE; + if (!XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) && + !(rec->rm_flags & XFS_RMAP_BMBT_BLOCK) && + (rec->rm_offset > info->high.rm_offset || + rec->rm_offset + rec->rm_blockcount <= info->high.rm_offset)) + return XFS_BTREE_QUERY_RANGE_CONTINUE; + + *info->irec = *rec; + *info->stat = 1; + return XFS_BTREE_QUERY_RANGE_ABORT; +} + +/* + * Find the record to the left of the given extent, being careful only to + * return a match with the same owner and overlapping physical and logical + * block ranges. This is the overlapping-interval version of + * xfs_rmap_lookup_le. + */ +int +xfs_rmap_lookup_le_range( + struct xfs_btree_cur *cur, + xfs_agblock_t bno, + uint64_t owner, + uint64_t offset, + unsigned int flags, + struct xfs_rmap_irec *irec, + int *stat) +{ + struct xfs_find_left_neighbor_info info; + int error; + + info.high.rm_startblock = bno; + info.high.rm_owner = owner; + if (!XFS_RMAP_NON_INODE_OWNER(owner) && !(flags & XFS_RMAP_BMBT_BLOCK)) + info.high.rm_offset = offset; + else + info.high.rm_offset = 0; + info.high.rm_flags = flags; + info.high.rm_blockcount = 0; + *stat = 0; + info.irec = irec; + info.stat = stat; + + trace_xfs_rmap_lookup_le_range(cur->bc_mp, + cur->bc_private.a.agno, bno, 0, owner, offset, flags); + error = xfs_rmap_query_range(cur, &info.high, &info.high, + xfs_rmap_lookup_le_range_helper, &info); + if (error == XFS_BTREE_QUERY_RANGE_ABORT) + error = 0; + if (*stat) + trace_xfs_rmap_lookup_le_range_result(cur->bc_mp, + cur->bc_private.a.agno, irec->rm_startblock, + irec->rm_blockcount, irec->rm_owner, + irec->rm_offset, irec->rm_flags); + return error; +} + /* * Find the extent in the rmap btree and remove it. * @@ -1098,6 +1283,321 @@ done: #undef RIGHT #undef PREV +/* + * Find an extent in the rmap btree and unmap it. For rmap extent types that + * can overlap (data fork rmaps on reflink filesystems) we must be careful + * that the prev/next records in the btree might belong to another owner. + * Therefore we must use delete+insert to alter any of the key fields. + * + * For every other situation there can only be one owner for a given extent, + * so we can call the regular _free function. + */ +STATIC int +xfs_rmap_unmap_shared( + struct xfs_btree_cur *cur, + xfs_agblock_t bno, + xfs_extlen_t len, + bool unwritten, + struct xfs_owner_info *oinfo) +{ + struct xfs_mount *mp = cur->bc_mp; + struct xfs_rmap_irec ltrec; + uint64_t ltoff; + int error = 0; + int i; + uint64_t owner; + uint64_t offset; + unsigned int flags; + + xfs_owner_info_unpack(oinfo, &owner, &offset, &flags); + if (unwritten) + flags |= XFS_RMAP_UNWRITTEN; + trace_xfs_rmap_unmap(mp, cur->bc_private.a.agno, bno, len, + unwritten, oinfo); + + /* + * We should always have a left record because there's a static record + * for the AG headers at rm_startblock == 0 created by mkfs/growfs that + * will not ever be removed from the tree. + */ + error = xfs_rmap_lookup_le_range(cur, bno, owner, offset, flags, + <rec, &i); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_error); + ltoff = ltrec.rm_offset; + + /* Make sure the extent we found covers the entire freeing range. */ + XFS_WANT_CORRUPTED_GOTO(mp, ltrec.rm_startblock <= bno && + ltrec.rm_startblock + ltrec.rm_blockcount >= + bno + len, out_error); + + /* Make sure the owner matches what we expect to find in the tree. */ + XFS_WANT_CORRUPTED_GOTO(mp, owner == ltrec.rm_owner, out_error); + + /* Make sure the unwritten flag matches. */ + XFS_WANT_CORRUPTED_GOTO(mp, (flags & XFS_RMAP_UNWRITTEN) == + (ltrec.rm_flags & XFS_RMAP_UNWRITTEN), out_error); + + /* Check the offset. */ + XFS_WANT_CORRUPTED_GOTO(mp, ltrec.rm_offset <= offset, out_error); + XFS_WANT_CORRUPTED_GOTO(mp, offset <= ltoff + ltrec.rm_blockcount, + out_error); + + if (ltrec.rm_startblock == bno && ltrec.rm_blockcount == len) { + /* Exact match, simply remove the record from rmap tree. */ + error = xfs_rmap_delete(cur, ltrec.rm_startblock, + ltrec.rm_blockcount, ltrec.rm_owner, + ltrec.rm_offset, ltrec.rm_flags); + if (error) + goto out_error; + } else if (ltrec.rm_startblock == bno) { + /* + * Overlap left hand side of extent: move the start, trim the + * length and update the current record. + * + * ltbno ltlen + * Orig: |oooooooooooooooooooo| + * Freeing: |fffffffff| + * Result: |rrrrrrrrrr| + * bno len + */ + + /* Delete prev rmap. */ + error = xfs_rmap_delete(cur, ltrec.rm_startblock, + ltrec.rm_blockcount, ltrec.rm_owner, + ltrec.rm_offset, ltrec.rm_flags); + if (error) + goto out_error; + + /* Add an rmap at the new offset. */ + ltrec.rm_startblock += len; + ltrec.rm_blockcount -= len; + ltrec.rm_offset += len; + error = xfs_rmap_insert(cur, ltrec.rm_startblock, + ltrec.rm_blockcount, ltrec.rm_owner, + ltrec.rm_offset, ltrec.rm_flags); + if (error) + goto out_error; + } else if (ltrec.rm_startblock + ltrec.rm_blockcount == bno + len) { + /* + * Overlap right hand side of extent: trim the length and + * update the current record. + * + * ltbno ltlen + * Orig: |oooooooooooooooooooo| + * Freeing: |fffffffff| + * Result: |rrrrrrrrrr| + * bno len + */ + error = xfs_rmap_lookup_eq(cur, ltrec.rm_startblock, + ltrec.rm_blockcount, ltrec.rm_owner, + ltrec.rm_offset, ltrec.rm_flags, &i); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_error); + ltrec.rm_blockcount -= len; + error = xfs_rmap_update(cur, <rec); + if (error) + goto out_error; + } else { + /* + * Overlap middle of extent: trim the length of the existing + * record to the length of the new left-extent size, increment + * the insertion position so we can insert a new record + * containing the remaining right-extent space. + * + * ltbno ltlen + * Orig: |oooooooooooooooooooo| + * Freeing: |fffffffff| + * Result: |rrrrr| |rrrr| + * bno len + */ + xfs_extlen_t orig_len = ltrec.rm_blockcount; + + /* Shrink the left side of the rmap */ + error = xfs_rmap_lookup_eq(cur, ltrec.rm_startblock, + ltrec.rm_blockcount, ltrec.rm_owner, + ltrec.rm_offset, ltrec.rm_flags, &i); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_error); + ltrec.rm_blockcount = bno - ltrec.rm_startblock; + error = xfs_rmap_update(cur, <rec); + if (error) + goto out_error; + + /* Add an rmap at the new offset */ + error = xfs_rmap_insert(cur, bno + len, + orig_len - len - ltrec.rm_blockcount, + ltrec.rm_owner, offset + len, + ltrec.rm_flags); + if (error) + goto out_error; + } + + trace_xfs_rmap_unmap_done(mp, cur->bc_private.a.agno, bno, len, + unwritten, oinfo); +out_error: + if (error) + trace_xfs_rmap_unmap_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + +/* + * Find an extent in the rmap btree and map it. For rmap extent types that + * can overlap (data fork rmaps on reflink filesystems) we must be careful + * that the prev/next records in the btree might belong to another owner. + * Therefore we must use delete+insert to alter any of the key fields. + * + * For every other situation there can only be one owner for a given extent, + * so we can call the regular _alloc function. + */ +STATIC int +xfs_rmap_map_shared( + struct xfs_btree_cur *cur, + xfs_agblock_t bno, + xfs_extlen_t len, + bool unwritten, + struct xfs_owner_info *oinfo) +{ + struct xfs_mount *mp = cur->bc_mp; + struct xfs_rmap_irec ltrec; + struct xfs_rmap_irec gtrec; + int have_gt; + int have_lt; + int error = 0; + int i; + uint64_t owner; + uint64_t offset; + unsigned int flags = 0; + + xfs_owner_info_unpack(oinfo, &owner, &offset, &flags); + if (unwritten) + flags |= XFS_RMAP_UNWRITTEN; + trace_xfs_rmap_map(mp, cur->bc_private.a.agno, bno, len, + unwritten, oinfo); + + /* Is there a left record that abuts our range? */ + error = xfs_rmap_find_left_neighbor(cur, bno, owner, offset, flags, + <rec, &have_lt); + if (error) + goto out_error; + if (have_lt && + !xfs_rmap_is_mergeable(<rec, owner, flags)) + have_lt = 0; + + /* Is there a right record that abuts our range? */ + error = xfs_rmap_lookup_eq(cur, bno + len, len, owner, offset + len, + flags, &have_gt); + if (error) + goto out_error; + if (have_gt) { + error = xfs_rmap_get_rec(cur, >rec, &have_gt); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(mp, have_gt == 1, out_error); + trace_xfs_rmap_find_right_neighbor_result(cur->bc_mp, + cur->bc_private.a.agno, gtrec.rm_startblock, + gtrec.rm_blockcount, gtrec.rm_owner, + gtrec.rm_offset, gtrec.rm_flags); + + if (!xfs_rmap_is_mergeable(>rec, owner, flags)) + have_gt = 0; + } + + if (have_lt && + ltrec.rm_startblock + ltrec.rm_blockcount == bno && + ltrec.rm_offset + ltrec.rm_blockcount == offset) { + /* + * Left edge contiguous, merge into left record. + * + * ltbno ltlen + * orig: |ooooooooo| + * adding: |aaaaaaaaa| + * result: |rrrrrrrrrrrrrrrrrrr| + * bno len + */ + ltrec.rm_blockcount += len; + if (have_gt && + bno + len == gtrec.rm_startblock && + offset + len == gtrec.rm_offset) { + /* + * Right edge also contiguous, delete right record + * and merge into left record. + * + * ltbno ltlen gtbno gtlen + * orig: |ooooooooo| |ooooooooo| + * adding: |aaaaaaaaa| + * result: |rrrrrrrrrrrrrrrrrrrrrrrrrrrrr| + */ + ltrec.rm_blockcount += gtrec.rm_blockcount; + error = xfs_rmap_delete(cur, gtrec.rm_startblock, + gtrec.rm_blockcount, gtrec.rm_owner, + gtrec.rm_offset, gtrec.rm_flags); + if (error) + goto out_error; + } + + /* Point the cursor back to the left record and update. */ + error = xfs_rmap_lookup_eq(cur, ltrec.rm_startblock, + ltrec.rm_blockcount, ltrec.rm_owner, + ltrec.rm_offset, ltrec.rm_flags, &i); + if (error) + goto out_error; + XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_error); + + error = xfs_rmap_update(cur, <rec); + if (error) + goto out_error; + } else if (have_gt && + bno + len == gtrec.rm_startblock && + offset + len == gtrec.rm_offset) { + /* + * Right edge contiguous, merge into right record. + * + * gtbno gtlen + * Orig: |ooooooooo| + * adding: |aaaaaaaaa| + * Result: |rrrrrrrrrrrrrrrrrrr| + * bno len + */ + /* Delete the old record. */ + error = xfs_rmap_delete(cur, gtrec.rm_startblock, + gtrec.rm_blockcount, gtrec.rm_owner, + gtrec.rm_offset, gtrec.rm_flags); + if (error) + goto out_error; + + /* Move the start and re-add it. */ + gtrec.rm_startblock = bno; + gtrec.rm_blockcount += len; + gtrec.rm_offset = offset; + error = xfs_rmap_insert(cur, gtrec.rm_startblock, + gtrec.rm_blockcount, gtrec.rm_owner, + gtrec.rm_offset, gtrec.rm_flags); + if (error) + goto out_error; + } else { + /* + * No contiguous edge with identical owner, insert + * new record at current cursor position. + */ + error = xfs_rmap_insert(cur, bno, len, owner, offset, flags); + if (error) + goto out_error; + } + + trace_xfs_rmap_map_done(mp, cur->bc_private.a.agno, bno, len, + unwritten, oinfo); +out_error: + if (error) + trace_xfs_rmap_map_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + struct xfs_rmap_query_range_info { xfs_rmap_query_range_fn fn; void *priv; @@ -1237,11 +1737,19 @@ xfs_rmap_finish_one( case XFS_RMAP_MAP: error = xfs_rmap_map(rcur, bno, blockcount, unwritten, &oinfo); break; + case XFS_RMAP_MAP_SHARED: + error = xfs_rmap_map_shared(rcur, bno, blockcount, unwritten, + &oinfo); + break; case XFS_RMAP_FREE: case XFS_RMAP_UNMAP: error = xfs_rmap_unmap(rcur, bno, blockcount, unwritten, &oinfo); break; + case XFS_RMAP_UNMAP_SHARED: + error = xfs_rmap_unmap_shared(rcur, bno, blockcount, unwritten, + &oinfo); + break; case XFS_RMAP_CONVERT: error = xfs_rmap_convert(rcur, bno, blockcount, !unwritten, &oinfo); @@ -1315,7 +1823,8 @@ xfs_rmap_map_extent( if (!xfs_rmap_update_is_needed(mp, whichfork)) return 0; - return __xfs_rmap_add(mp, dfops, XFS_RMAP_MAP, ip->i_ino, + return __xfs_rmap_add(mp, dfops, xfs_is_reflink_inode(ip) ? + XFS_RMAP_MAP_SHARED : XFS_RMAP_MAP, ip->i_ino, whichfork, PREV); } @@ -1331,7 +1840,8 @@ xfs_rmap_unmap_extent( if (!xfs_rmap_update_is_needed(mp, whichfork)) return 0; - return __xfs_rmap_add(mp, dfops, XFS_RMAP_UNMAP, ip->i_ino, + return __xfs_rmap_add(mp, dfops, xfs_is_reflink_inode(ip) ? + XFS_RMAP_UNMAP_SHARED : XFS_RMAP_UNMAP, ip->i_ino, whichfork, PREV); } diff --git a/fs/xfs/libxfs/xfs_rmap.h b/fs/xfs/libxfs/xfs_rmap.h index 71cf99a4acba..789930599339 100644 --- a/fs/xfs/libxfs/xfs_rmap.h +++ b/fs/xfs/libxfs/xfs_rmap.h @@ -206,4 +206,11 @@ int xfs_rmap_finish_one(struct xfs_trans *tp, enum xfs_rmap_intent_type type, xfs_fsblock_t startblock, xfs_filblks_t blockcount, xfs_exntst_t state, struct xfs_btree_cur **pcur); +int xfs_rmap_find_left_neighbor(struct xfs_btree_cur *cur, xfs_agblock_t bno, + uint64_t owner, uint64_t offset, unsigned int flags, + struct xfs_rmap_irec *irec, int *stat); +int xfs_rmap_lookup_le_range(struct xfs_btree_cur *cur, xfs_agblock_t bno, + uint64_t owner, uint64_t offset, unsigned int flags, + struct xfs_rmap_irec *irec, int *stat); + #endif /* __XFS_RMAP_H__ */ diff --git a/fs/xfs/xfs_rmap_item.c b/fs/xfs/xfs_rmap_item.c index 19d817e3e1d9..3b8742e48815 100644 --- a/fs/xfs/xfs_rmap_item.c +++ b/fs/xfs/xfs_rmap_item.c @@ -484,9 +484,15 @@ xfs_rui_recover( case XFS_RMAP_EXTENT_MAP: type = XFS_RMAP_MAP; break; + case XFS_RMAP_EXTENT_MAP_SHARED: + type = XFS_RMAP_MAP_SHARED; + break; case XFS_RMAP_EXTENT_UNMAP: type = XFS_RMAP_UNMAP; break; + case XFS_RMAP_EXTENT_UNMAP_SHARED: + type = XFS_RMAP_UNMAP_SHARED; + break; case XFS_RMAP_EXTENT_CONVERT: type = XFS_RMAP_CONVERT; break; diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 263dab10c982..75bf18bc275b 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -2588,6 +2588,11 @@ DEFINE_RMAPBT_EVENT(xfs_rmap_delete); DEFINE_AG_ERROR_EVENT(xfs_rmap_insert_error); DEFINE_AG_ERROR_EVENT(xfs_rmap_delete_error); DEFINE_AG_ERROR_EVENT(xfs_rmap_update_error); + +DEFINE_RMAPBT_EVENT(xfs_rmap_find_left_neighbor_candidate); +DEFINE_RMAPBT_EVENT(xfs_rmap_find_left_neighbor_query); +DEFINE_RMAPBT_EVENT(xfs_rmap_lookup_le_range_candidate); +DEFINE_RMAPBT_EVENT(xfs_rmap_lookup_le_range); DEFINE_RMAPBT_EVENT(xfs_rmap_lookup_le_range_result); DEFINE_RMAPBT_EVENT(xfs_rmap_find_right_neighbor_result); DEFINE_RMAPBT_EVENT(xfs_rmap_find_left_neighbor_result); -- cgit v1.2.3-59-g8ed1b From 3f165b334e51477d2b33ac1c81b39927514daab7 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:48 -0700 Subject: xfs: convert unwritten status of reverse mappings for shared files Provide a function to convert an unwritten extent to a real one and vice versa when shared extents are possible. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_rmap.c | 385 ++++++++++++++++++++++++++++++++++++++++++++++- fs/xfs/xfs_rmap_item.c | 3 + 2 files changed, 387 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_rmap.c b/fs/xfs/libxfs/xfs_rmap.c index bb5e2f840370..3a8cc7139912 100644 --- a/fs/xfs/libxfs/xfs_rmap.c +++ b/fs/xfs/libxfs/xfs_rmap.c @@ -1278,6 +1278,384 @@ done: return error; } +/* + * Convert an unwritten extent to a real extent or vice versa. If there is no + * possibility of overlapping extents, delegate to the simpler convert + * function. + */ +STATIC int +xfs_rmap_convert_shared( + struct xfs_btree_cur *cur, + xfs_agblock_t bno, + xfs_extlen_t len, + bool unwritten, + struct xfs_owner_info *oinfo) +{ + struct xfs_mount *mp = cur->bc_mp; + struct xfs_rmap_irec r[4]; /* neighbor extent entries */ + /* left is 0, right is 1, prev is 2 */ + /* new is 3 */ + uint64_t owner; + uint64_t offset; + uint64_t new_endoff; + unsigned int oldext; + unsigned int newext; + unsigned int flags = 0; + int i; + int state = 0; + int error; + + xfs_owner_info_unpack(oinfo, &owner, &offset, &flags); + ASSERT(!(XFS_RMAP_NON_INODE_OWNER(owner) || + (flags & (XFS_RMAP_ATTR_FORK | XFS_RMAP_BMBT_BLOCK)))); + oldext = unwritten ? XFS_RMAP_UNWRITTEN : 0; + new_endoff = offset + len; + trace_xfs_rmap_convert(mp, cur->bc_private.a.agno, bno, len, + unwritten, oinfo); + + /* + * For the initial lookup, look for and exact match or the left-adjacent + * record for our insertion point. This will also give us the record for + * start block contiguity tests. + */ + error = xfs_rmap_lookup_le_range(cur, bno, owner, offset, flags, + &PREV, &i); + XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); + + ASSERT(PREV.rm_offset <= offset); + ASSERT(PREV.rm_offset + PREV.rm_blockcount >= new_endoff); + ASSERT((PREV.rm_flags & XFS_RMAP_UNWRITTEN) == oldext); + newext = ~oldext & XFS_RMAP_UNWRITTEN; + + /* + * Set flags determining what part of the previous oldext allocation + * extent is being replaced by a newext allocation. + */ + if (PREV.rm_offset == offset) + state |= RMAP_LEFT_FILLING; + if (PREV.rm_offset + PREV.rm_blockcount == new_endoff) + state |= RMAP_RIGHT_FILLING; + + /* Is there a left record that abuts our range? */ + error = xfs_rmap_find_left_neighbor(cur, bno, owner, offset, newext, + &LEFT, &i); + if (error) + goto done; + if (i) { + state |= RMAP_LEFT_VALID; + XFS_WANT_CORRUPTED_GOTO(mp, + LEFT.rm_startblock + LEFT.rm_blockcount <= bno, + done); + if (xfs_rmap_is_mergeable(&LEFT, owner, newext)) + state |= RMAP_LEFT_CONTIG; + } + + /* Is there a right record that abuts our range? */ + error = xfs_rmap_lookup_eq(cur, bno + len, len, owner, offset + len, + newext, &i); + if (error) + goto done; + if (i) { + state |= RMAP_RIGHT_VALID; + error = xfs_rmap_get_rec(cur, &RIGHT, &i); + if (error) + goto done; + XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); + XFS_WANT_CORRUPTED_GOTO(mp, bno + len <= RIGHT.rm_startblock, + done); + trace_xfs_rmap_find_right_neighbor_result(cur->bc_mp, + cur->bc_private.a.agno, RIGHT.rm_startblock, + RIGHT.rm_blockcount, RIGHT.rm_owner, + RIGHT.rm_offset, RIGHT.rm_flags); + if (xfs_rmap_is_mergeable(&RIGHT, owner, newext)) + state |= RMAP_RIGHT_CONTIG; + } + + /* check that left + prev + right is not too long */ + if ((state & (RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG | + RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG)) == + (RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG | + RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG) && + (unsigned long)LEFT.rm_blockcount + len + + RIGHT.rm_blockcount > XFS_RMAP_LEN_MAX) + state &= ~RMAP_RIGHT_CONTIG; + + trace_xfs_rmap_convert_state(mp, cur->bc_private.a.agno, state, + _RET_IP_); + /* + * Switch out based on the FILLING and CONTIG state bits. + */ + switch (state & (RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG | + RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG)) { + case RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG | + RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG: + /* + * Setting all of a previous oldext extent to newext. + * The left and right neighbors are both contiguous with new. + */ + error = xfs_rmap_delete(cur, RIGHT.rm_startblock, + RIGHT.rm_blockcount, RIGHT.rm_owner, + RIGHT.rm_offset, RIGHT.rm_flags); + if (error) + goto done; + error = xfs_rmap_delete(cur, PREV.rm_startblock, + PREV.rm_blockcount, PREV.rm_owner, + PREV.rm_offset, PREV.rm_flags); + if (error) + goto done; + NEW = LEFT; + error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, + NEW.rm_offset, NEW.rm_flags, &i); + if (error) + goto done; + XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); + NEW.rm_blockcount += PREV.rm_blockcount + RIGHT.rm_blockcount; + error = xfs_rmap_update(cur, &NEW); + if (error) + goto done; + break; + + case RMAP_LEFT_FILLING | RMAP_RIGHT_FILLING | RMAP_LEFT_CONTIG: + /* + * Setting all of a previous oldext extent to newext. + * The left neighbor is contiguous, the right is not. + */ + error = xfs_rmap_delete(cur, PREV.rm_startblock, + PREV.rm_blockcount, PREV.rm_owner, + PREV.rm_offset, PREV.rm_flags); + if (error) + goto done; + NEW = LEFT; + error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, + NEW.rm_offset, NEW.rm_flags, &i); + if (error) + goto done; + XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); + NEW.rm_blockcount += PREV.rm_blockcount; + error = xfs_rmap_update(cur, &NEW); + if (error) + goto done; + break; + + case RMAP_LEFT_FILLING | RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG: + /* + * Setting all of a previous oldext extent to newext. + * The right neighbor is contiguous, the left is not. + */ + error = xfs_rmap_delete(cur, RIGHT.rm_startblock, + RIGHT.rm_blockcount, RIGHT.rm_owner, + RIGHT.rm_offset, RIGHT.rm_flags); + if (error) + goto done; + NEW = PREV; + error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, + NEW.rm_offset, NEW.rm_flags, &i); + if (error) + goto done; + XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); + NEW.rm_blockcount += RIGHT.rm_blockcount; + NEW.rm_flags = RIGHT.rm_flags; + error = xfs_rmap_update(cur, &NEW); + if (error) + goto done; + break; + + case RMAP_LEFT_FILLING | RMAP_RIGHT_FILLING: + /* + * Setting all of a previous oldext extent to newext. + * Neither the left nor right neighbors are contiguous with + * the new one. + */ + NEW = PREV; + error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, + NEW.rm_offset, NEW.rm_flags, &i); + if (error) + goto done; + XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); + NEW.rm_flags = newext; + error = xfs_rmap_update(cur, &NEW); + if (error) + goto done; + break; + + case RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG: + /* + * Setting the first part of a previous oldext extent to newext. + * The left neighbor is contiguous. + */ + NEW = PREV; + error = xfs_rmap_delete(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, + NEW.rm_offset, NEW.rm_flags); + if (error) + goto done; + NEW.rm_offset += len; + NEW.rm_startblock += len; + NEW.rm_blockcount -= len; + error = xfs_rmap_insert(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, + NEW.rm_offset, NEW.rm_flags); + if (error) + goto done; + NEW = LEFT; + error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, + NEW.rm_offset, NEW.rm_flags, &i); + if (error) + goto done; + XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); + NEW.rm_blockcount += len; + error = xfs_rmap_update(cur, &NEW); + if (error) + goto done; + break; + + case RMAP_LEFT_FILLING: + /* + * Setting the first part of a previous oldext extent to newext. + * The left neighbor is not contiguous. + */ + NEW = PREV; + error = xfs_rmap_delete(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, + NEW.rm_offset, NEW.rm_flags); + if (error) + goto done; + NEW.rm_offset += len; + NEW.rm_startblock += len; + NEW.rm_blockcount -= len; + error = xfs_rmap_insert(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, + NEW.rm_offset, NEW.rm_flags); + if (error) + goto done; + error = xfs_rmap_insert(cur, bno, len, owner, offset, newext); + if (error) + goto done; + break; + + case RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG: + /* + * Setting the last part of a previous oldext extent to newext. + * The right neighbor is contiguous with the new allocation. + */ + NEW = PREV; + error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, + NEW.rm_offset, NEW.rm_flags, &i); + if (error) + goto done; + XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); + NEW.rm_blockcount = offset - NEW.rm_offset; + error = xfs_rmap_update(cur, &NEW); + if (error) + goto done; + NEW = RIGHT; + error = xfs_rmap_delete(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, + NEW.rm_offset, NEW.rm_flags); + if (error) + goto done; + NEW.rm_offset = offset; + NEW.rm_startblock = bno; + NEW.rm_blockcount += len; + error = xfs_rmap_insert(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, + NEW.rm_offset, NEW.rm_flags); + if (error) + goto done; + break; + + case RMAP_RIGHT_FILLING: + /* + * Setting the last part of a previous oldext extent to newext. + * The right neighbor is not contiguous. + */ + NEW = PREV; + error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, + NEW.rm_offset, NEW.rm_flags, &i); + if (error) + goto done; + XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); + NEW.rm_blockcount -= len; + error = xfs_rmap_update(cur, &NEW); + if (error) + goto done; + error = xfs_rmap_insert(cur, bno, len, owner, offset, newext); + if (error) + goto done; + break; + + case 0: + /* + * Setting the middle part of a previous oldext extent to + * newext. Contiguity is impossible here. + * One extent becomes three extents. + */ + /* new right extent - oldext */ + NEW.rm_startblock = bno + len; + NEW.rm_owner = owner; + NEW.rm_offset = new_endoff; + NEW.rm_blockcount = PREV.rm_offset + PREV.rm_blockcount - + new_endoff; + NEW.rm_flags = PREV.rm_flags; + error = xfs_rmap_insert(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, NEW.rm_offset, + NEW.rm_flags); + if (error) + goto done; + /* new left extent - oldext */ + NEW = PREV; + error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, + NEW.rm_offset, NEW.rm_flags, &i); + if (error) + goto done; + XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); + NEW.rm_blockcount = offset - NEW.rm_offset; + error = xfs_rmap_update(cur, &NEW); + if (error) + goto done; + /* new middle extent - newext */ + NEW.rm_startblock = bno; + NEW.rm_blockcount = len; + NEW.rm_owner = owner; + NEW.rm_offset = offset; + NEW.rm_flags = newext; + error = xfs_rmap_insert(cur, NEW.rm_startblock, + NEW.rm_blockcount, NEW.rm_owner, NEW.rm_offset, + NEW.rm_flags); + if (error) + goto done; + break; + + case RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG | RMAP_RIGHT_CONTIG: + case RMAP_RIGHT_FILLING | RMAP_LEFT_CONTIG | RMAP_RIGHT_CONTIG: + case RMAP_LEFT_FILLING | RMAP_RIGHT_CONTIG: + case RMAP_RIGHT_FILLING | RMAP_LEFT_CONTIG: + case RMAP_LEFT_CONTIG | RMAP_RIGHT_CONTIG: + case RMAP_LEFT_CONTIG: + case RMAP_RIGHT_CONTIG: + /* + * These cases are all impossible. + */ + ASSERT(0); + } + + trace_xfs_rmap_convert_done(mp, cur->bc_private.a.agno, bno, len, + unwritten, oinfo); +done: + if (error) + trace_xfs_rmap_convert_error(cur->bc_mp, + cur->bc_private.a.agno, error, _RET_IP_); + return error; +} + #undef NEW #undef LEFT #undef RIGHT @@ -1754,6 +2132,10 @@ xfs_rmap_finish_one( error = xfs_rmap_convert(rcur, bno, blockcount, !unwritten, &oinfo); break; + case XFS_RMAP_CONVERT_SHARED: + error = xfs_rmap_convert_shared(rcur, bno, blockcount, + !unwritten, &oinfo); + break; default: ASSERT(0); error = -EFSCORRUPTED; @@ -1857,7 +2239,8 @@ xfs_rmap_convert_extent( if (!xfs_rmap_update_is_needed(mp, whichfork)) return 0; - return __xfs_rmap_add(mp, dfops, XFS_RMAP_CONVERT, ip->i_ino, + return __xfs_rmap_add(mp, dfops, xfs_is_reflink_inode(ip) ? + XFS_RMAP_CONVERT_SHARED : XFS_RMAP_CONVERT, ip->i_ino, whichfork, PREV); } diff --git a/fs/xfs/xfs_rmap_item.c b/fs/xfs/xfs_rmap_item.c index 3b8742e48815..73c827831551 100644 --- a/fs/xfs/xfs_rmap_item.c +++ b/fs/xfs/xfs_rmap_item.c @@ -496,6 +496,9 @@ xfs_rui_recover( case XFS_RMAP_EXTENT_CONVERT: type = XFS_RMAP_CONVERT; break; + case XFS_RMAP_EXTENT_CONVERT_SHARED: + type = XFS_RMAP_CONVERT_SHARED; + break; case XFS_RMAP_EXTENT_ALLOC: type = XFS_RMAP_ALLOC; break; -- cgit v1.2.3-59-g8ed1b From e153aa7990a09a8a12860fc1f79304b02a6bc03f Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:49 -0700 Subject: xfs: set a default CoW extent size of 32 blocks If the admin doesn't set a CoW extent size or a regular extent size hint, default to creating CoW reservations 32 blocks long to reduce fragmentation. Signed-off-by: DarricK J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_inode.c | 10 ++++++---- fs/xfs/xfs_inode.h | 3 +++ 2 files changed, 9 insertions(+), 4 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index 89e6441f963f..3332fb695cfd 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -80,7 +80,8 @@ xfs_get_extsz_hint( /* * Helper function to extract CoW extent size hint from inode. * Between the extent size hint and the CoW extent size hint, we - * return the greater of the two. + * return the greater of the two. If the value is zero (automatic), + * use the default size. */ xfs_extlen_t xfs_get_cowextsz_hint( @@ -93,9 +94,10 @@ xfs_get_cowextsz_hint( a = ip->i_d.di_cowextsize; b = xfs_get_extsz_hint(ip); - if (a > b) - return a; - return b; + a = max(a, b); + if (a == 0) + return XFS_DEFAULT_COWEXTSZ_HINT; + return a; } /* diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index 6d63dc031127..f14c1de2549d 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -490,4 +490,7 @@ do { \ extern struct kmem_zone *xfs_inode_zone; +/* The default CoW extent size hint. */ +#define XFS_DEFAULT_COWEXTSZ_HINT 32 + #endif /* __XFS_INODE_H__ */ -- cgit v1.2.3-59-g8ed1b From c8e156ac336d82f67d7adc014404a2251e9dad09 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:50 -0700 Subject: xfs: check for invalid inode reflink flags We don't support sharing blocks on the realtime device. Flag inodes with the reflink or cowextsize flags set when the reflink feature is disabled. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_inode_buf.c | 16 ++++++++++++++++ fs/xfs/xfs_ioctl.c | 4 ++++ 2 files changed, 20 insertions(+) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c index a3e803823a19..f1b9d97c540f 100644 --- a/fs/xfs/libxfs/xfs_inode_buf.c +++ b/fs/xfs/libxfs/xfs_inode_buf.c @@ -375,6 +375,9 @@ xfs_dinode_verify( struct xfs_inode *ip, struct xfs_dinode *dip) { + uint16_t flags; + uint64_t flags2; + if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC)) return false; @@ -391,6 +394,19 @@ xfs_dinode_verify( return false; if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid)) return false; + + flags = be16_to_cpu(dip->di_flags); + flags2 = be64_to_cpu(dip->di_flags2); + + /* don't allow reflink/cowextsize if we don't have reflink */ + if ((flags2 & (XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)) && + !xfs_sb_version_hasreflink(&mp->m_sb)) + return false; + + /* don't let reflink and realtime mix */ + if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME)) + return false; + return true; } diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 1388a1275dc8..c65d9eacf54d 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1034,6 +1034,10 @@ xfs_ioctl_setattr_xflags( return -EINVAL; } + /* Don't allow us to set realtime mode for a reflinked file. */ + if ((fa->fsx_xflags & FS_XFLAG_REALTIME) && xfs_is_reflink_inode(ip)) + return -EINVAL; + /* * Can't modify an immutable/append-only file unless * we have appropriate permission. -- cgit v1.2.3-59-g8ed1b From 4f435ebe7d0422af61cdcddbbcc659888645a1e1 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:50 -0700 Subject: xfs: don't mix reflink and DAX mode for now Since we don't have a strategy for handling both DAX and reflink, for now we'll just prohibit both being set at the same time. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_inode_buf.c | 4 ++++ fs/xfs/xfs_file.c | 4 ++++ fs/xfs/xfs_ioctl.c | 4 ++++ fs/xfs/xfs_iops.c | 1 + 4 files changed, 13 insertions(+) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c index f1b9d97c540f..8de9a3a29589 100644 --- a/fs/xfs/libxfs/xfs_inode_buf.c +++ b/fs/xfs/libxfs/xfs_inode_buf.c @@ -407,6 +407,10 @@ xfs_dinode_verify( if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME)) return false; + /* don't let reflink and dax mix */ + if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags2 & XFS_DIFLAG2_DAX)) + return false; + return true; } diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 0726df88bce2..54c27edb74bc 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1055,6 +1055,10 @@ xfs_file_share_range( if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) return -EINVAL; + /* Don't share DAX file data for now. */ + if (IS_DAX(inode_in) || IS_DAX(inode_out)) + return -EINVAL; + /* Are we going all the way to the end? */ isize = i_size_read(inode_in); if (isize == 0) diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index c65d9eacf54d..8b9f31c54c1e 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1038,6 +1038,10 @@ xfs_ioctl_setattr_xflags( if ((fa->fsx_xflags & FS_XFLAG_REALTIME) && xfs_is_reflink_inode(ip)) return -EINVAL; + /* Don't allow us to set DAX mode for a reflinked file for now. */ + if ((fa->fsx_xflags & FS_XFLAG_DAX) && xfs_is_reflink_inode(ip)) + return -EINVAL; + /* * Can't modify an immutable/append-only file unless * we have appropriate permission. diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index b24c3102fa93..5945b64f77cc 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -1144,6 +1144,7 @@ xfs_diflags_to_iflags( inode->i_flags |= S_NOATIME; if (S_ISREG(inode->i_mode) && ip->i_mount->m_sb.sb_blocksize == PAGE_SIZE && + !xfs_is_reflink_inode(ip) && (ip->i_mount->m_flags & XFS_MOUNT_DAX || ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)) inode->i_flags |= S_DAX; -- cgit v1.2.3-59-g8ed1b From a35eb41519ab8db90e87d375ee9362d6e080ca4c Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:51 -0700 Subject: xfs: simulate per-AG reservations being critically low Create an error injection point that enables us to simulate being critically low on per-AG block reservations. This should enable us to simulate this specific ENOSPC condition so that we can test falling back to a regular file copy. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_ag_resv.c | 4 +++- fs/xfs/xfs_error.h | 4 +++- 2 files changed, 6 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_ag_resv.c b/fs/xfs/libxfs/xfs_ag_resv.c index adf770f0d011..e5ebc3770460 100644 --- a/fs/xfs/libxfs/xfs_ag_resv.c +++ b/fs/xfs/libxfs/xfs_ag_resv.c @@ -109,7 +109,9 @@ xfs_ag_resv_critical( trace_xfs_ag_resv_critical(pag, type, avail); /* Critically low if less than 10% or max btree height remains. */ - return avail < orig / 10 || avail < XFS_BTREE_MAXLEVELS; + return XFS_TEST_ERROR(avail < orig / 10 || avail < XFS_BTREE_MAXLEVELS, + pag->pag_mount, XFS_ERRTAG_AG_RESV_CRITICAL, + XFS_RANDOM_AG_RESV_CRITICAL); } /* diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h index 8d8e1b07d295..05f8666733a0 100644 --- a/fs/xfs/xfs_error.h +++ b/fs/xfs/xfs_error.h @@ -95,7 +95,8 @@ extern void xfs_verifier_error(struct xfs_buf *bp); #define XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE 24 #define XFS_ERRTAG_REFCOUNT_FINISH_ONE 25 #define XFS_ERRTAG_BMAP_FINISH_ONE 26 -#define XFS_ERRTAG_MAX 27 +#define XFS_ERRTAG_AG_RESV_CRITICAL 27 +#define XFS_ERRTAG_MAX 28 /* * Random factors for above tags, 1 means always, 2 means 1/2 time, etc. @@ -127,6 +128,7 @@ extern void xfs_verifier_error(struct xfs_buf *bp); #define XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE 1 #define XFS_RANDOM_REFCOUNT_FINISH_ONE 1 #define XFS_RANDOM_BMAP_FINISH_ONE 1 +#define XFS_RANDOM_AG_RESV_CRITICAL 4 #ifdef DEBUG extern int xfs_error_test_active; -- cgit v1.2.3-59-g8ed1b From e54b5bf9d7aeb92d92c7f5115035e6a851d0f0c5 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:52 -0700 Subject: xfs: recognize the reflink feature bit Add the reflink feature flag to the set of recognized feature flags. This enables users to write to reflink filesystems. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_format.h | 3 ++- fs/xfs/xfs_super.c | 7 +++++++ 2 files changed, 9 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 5e04ea2aa902..f6547fc5e016 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -459,7 +459,8 @@ xfs_sb_has_compat_feature( #define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */ #define XFS_SB_FEAT_RO_COMPAT_ALL \ (XFS_SB_FEAT_RO_COMPAT_FINOBT | \ - XFS_SB_FEAT_RO_COMPAT_RMAPBT) + XFS_SB_FEAT_RO_COMPAT_RMAPBT | \ + XFS_SB_FEAT_RO_COMPAT_REFLINK) #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL static inline bool xfs_sb_has_ro_compat_feature( diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 15b9fcd16c67..72bde2811bd7 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1614,6 +1614,9 @@ xfs_fs_fill_super( "DAX unsupported by block device. Turning off DAX."); mp->m_flags &= ~XFS_MOUNT_DAX; } + if (xfs_sb_version_hasreflink(&mp->m_sb)) + xfs_alert(mp, + "DAX and reflink have not been tested together!"); } if (xfs_sb_version_hasrmapbt(&mp->m_sb)) { @@ -1627,6 +1630,10 @@ xfs_fs_fill_super( "EXPERIMENTAL reverse mapping btree feature enabled. Use at your own risk!"); } + if (xfs_sb_version_hasreflink(&mp->m_sb)) + xfs_alert(mp, + "EXPERIMENTAL reflink feature enabled. Use at your own risk!"); + error = xfs_mountfs(mp); if (error) goto out_filestream_unmount; -- cgit v1.2.3-59-g8ed1b From e06259aa08fbc88c824130764c8667a8cc68c4d1 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:52 -0700 Subject: xfs: various swapext cleanups Replace structure typedefs with struct expressions and fix some whitespace issues that result. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_bmap_util.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index eacd4c203376..9481e5fc247a 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -1564,8 +1564,8 @@ xfs_insert_file_space( */ static int xfs_swap_extents_check_format( - xfs_inode_t *ip, /* target inode */ - xfs_inode_t *tip) /* tmp inode */ + struct xfs_inode *ip, /* target inode */ + struct xfs_inode *tip) /* tmp inode */ { /* Should never get a local format */ @@ -1651,22 +1651,22 @@ xfs_swap_extent_flush( int xfs_swap_extents( - xfs_inode_t *ip, /* target inode */ - xfs_inode_t *tip, /* tmp inode */ - xfs_swapext_t *sxp) + struct xfs_inode *ip, /* target inode */ + struct xfs_inode *tip, /* tmp inode */ + struct xfs_swapext *sxp) { - xfs_mount_t *mp = ip->i_mount; - xfs_trans_t *tp; - xfs_bstat_t *sbp = &sxp->sx_stat; - xfs_ifork_t *tempifp, *ifp, *tifp; - int src_log_flags, target_log_flags; - int error = 0; - int aforkblks = 0; - int taforkblks = 0; - __uint64_t tmp; - int lock_flags; + struct xfs_mount *mp = ip->i_mount; + struct xfs_trans *tp; + struct xfs_bstat *sbp = &sxp->sx_stat; + struct xfs_ifork *tempifp, *ifp, *tifp; + int src_log_flags, target_log_flags; + int error = 0; + int aforkblks = 0; + int taforkblks = 0; + __uint64_t tmp; + int lock_flags; struct xfs_ifork *cowfp; - __uint64_t f; + __uint64_t f; /* XXX: we can't do this with rmap, will fix later */ if (xfs_sb_version_hasrmapbt(&mp->m_sb)) -- cgit v1.2.3-59-g8ed1b From 39aff5fdb91e8fee6a2c28910a263a5228619ba2 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:53 -0700 Subject: xfs: refactor swapext code Refactor the swapext function to pull out the fork swapping piece into a separate function. In the next patch we'll add in the bit we need to make it work with rmap filesystems. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_bmap_util.c | 275 ++++++++++++++++++++++++++----------------------- 1 file changed, 144 insertions(+), 131 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index 9481e5fc247a..b278d62b7152 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -1649,127 +1649,37 @@ xfs_swap_extent_flush( return 0; } -int -xfs_swap_extents( - struct xfs_inode *ip, /* target inode */ - struct xfs_inode *tip, /* tmp inode */ - struct xfs_swapext *sxp) +/* Swap the extents of two files by swapping data forks. */ +STATIC int +xfs_swap_extent_forks( + struct xfs_trans *tp, + struct xfs_inode *ip, + struct xfs_inode *tip, + int *src_log_flags, + int *target_log_flags) { - struct xfs_mount *mp = ip->i_mount; - struct xfs_trans *tp; - struct xfs_bstat *sbp = &sxp->sx_stat; - struct xfs_ifork *tempifp, *ifp, *tifp; - int src_log_flags, target_log_flags; - int error = 0; + struct xfs_ifork tempifp, *ifp, *tifp; int aforkblks = 0; int taforkblks = 0; __uint64_t tmp; - int lock_flags; - struct xfs_ifork *cowfp; - __uint64_t f; - - /* XXX: we can't do this with rmap, will fix later */ - if (xfs_sb_version_hasrmapbt(&mp->m_sb)) - return -EOPNOTSUPP; - - tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL); - if (!tempifp) { - error = -ENOMEM; - goto out; - } - - /* - * Lock the inodes against other IO, page faults and truncate to - * begin with. Then we can ensure the inodes are flushed and have no - * page cache safely. Once we have done this we can take the ilocks and - * do the rest of the checks. - */ - lock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL; - xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL); - xfs_lock_two_inodes(ip, tip, XFS_MMAPLOCK_EXCL); - - /* Verify that both files have the same format */ - if ((VFS_I(ip)->i_mode & S_IFMT) != (VFS_I(tip)->i_mode & S_IFMT)) { - error = -EINVAL; - goto out_unlock; - } - - /* Verify both files are either real-time or non-realtime */ - if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) { - error = -EINVAL; - goto out_unlock; - } - - error = xfs_swap_extent_flush(ip); - if (error) - goto out_unlock; - error = xfs_swap_extent_flush(tip); - if (error) - goto out_unlock; - - error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp); - if (error) - goto out_unlock; - - /* - * Lock and join the inodes to the tansaction so that transaction commit - * or cancel will unlock the inodes from this point onwards. - */ - xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL); - lock_flags |= XFS_ILOCK_EXCL; - xfs_trans_ijoin(tp, ip, lock_flags); - xfs_trans_ijoin(tp, tip, lock_flags); - - - /* Verify all data are being swapped */ - if (sxp->sx_offset != 0 || - sxp->sx_length != ip->i_d.di_size || - sxp->sx_length != tip->i_d.di_size) { - error = -EFAULT; - goto out_trans_cancel; - } - - trace_xfs_swap_extent_before(ip, 0); - trace_xfs_swap_extent_before(tip, 1); - - /* check inode formats now that data is flushed */ - error = xfs_swap_extents_check_format(ip, tip); - if (error) { - xfs_notice(mp, - "%s: inode 0x%llx format is incompatible for exchanging.", - __func__, ip->i_ino); - goto out_trans_cancel; - } + int error; - /* - * Compare the current change & modify times with that - * passed in. If they differ, we abort this swap. - * This is the mechanism used to ensure the calling - * process that the file was not changed out from - * under it. - */ - if ((sbp->bs_ctime.tv_sec != VFS_I(ip)->i_ctime.tv_sec) || - (sbp->bs_ctime.tv_nsec != VFS_I(ip)->i_ctime.tv_nsec) || - (sbp->bs_mtime.tv_sec != VFS_I(ip)->i_mtime.tv_sec) || - (sbp->bs_mtime.tv_nsec != VFS_I(ip)->i_mtime.tv_nsec)) { - error = -EBUSY; - goto out_trans_cancel; - } /* * Count the number of extended attribute blocks */ if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) && (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { - error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks); + error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, + &aforkblks); if (error) - goto out_trans_cancel; + return error; } if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) && (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK, - &taforkblks); + &taforkblks); if (error) - goto out_trans_cancel; + return error; } /* @@ -1778,31 +1688,23 @@ xfs_swap_extents( * buffers, and so the validation done on read will expect the owner * field to be correctly set. Once we change the owners, we can swap the * inode forks. - * - * Note the trickiness in setting the log flags - we set the owner log - * flag on the opposite inode (i.e. the inode we are setting the new - * owner to be) because once we swap the forks and log that, log - * recovery is going to see the fork as owned by the swapped inode, - * not the pre-swapped inodes. */ - src_log_flags = XFS_ILOG_CORE; - target_log_flags = XFS_ILOG_CORE; if (ip->i_d.di_version == 3 && ip->i_d.di_format == XFS_DINODE_FMT_BTREE) { - target_log_flags |= XFS_ILOG_DOWNER; + (*target_log_flags) |= XFS_ILOG_DOWNER; error = xfs_bmbt_change_owner(tp, ip, XFS_DATA_FORK, tip->i_ino, NULL); if (error) - goto out_trans_cancel; + return error; } if (tip->i_d.di_version == 3 && tip->i_d.di_format == XFS_DINODE_FMT_BTREE) { - src_log_flags |= XFS_ILOG_DOWNER; + (*src_log_flags) |= XFS_ILOG_DOWNER; error = xfs_bmbt_change_owner(tp, tip, XFS_DATA_FORK, ip->i_ino, NULL); if (error) - goto out_trans_cancel; + return error; } /* @@ -1810,9 +1712,9 @@ xfs_swap_extents( */ ifp = &ip->i_df; tifp = &tip->i_df; - *tempifp = *ifp; /* struct copy */ + tempifp = *ifp; /* struct copy */ *ifp = *tifp; /* struct copy */ - *tifp = *tempifp; /* struct copy */ + *tifp = tempifp; /* struct copy */ /* * Fix the on-disk inode values @@ -1852,12 +1754,12 @@ xfs_swap_extents( ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext; } - src_log_flags |= XFS_ILOG_DEXT; + (*src_log_flags) |= XFS_ILOG_DEXT; break; case XFS_DINODE_FMT_BTREE: ASSERT(ip->i_d.di_version < 3 || - (src_log_flags & XFS_ILOG_DOWNER)); - src_log_flags |= XFS_ILOG_DBROOT; + (*src_log_flags & XFS_ILOG_DOWNER)); + (*src_log_flags) |= XFS_ILOG_DBROOT; break; } @@ -1871,15 +1773,126 @@ xfs_swap_extents( tifp->if_u1.if_extents = tifp->if_u2.if_inline_ext; } - target_log_flags |= XFS_ILOG_DEXT; + (*target_log_flags) |= XFS_ILOG_DEXT; break; case XFS_DINODE_FMT_BTREE: - target_log_flags |= XFS_ILOG_DBROOT; + (*target_log_flags) |= XFS_ILOG_DBROOT; ASSERT(tip->i_d.di_version < 3 || - (target_log_flags & XFS_ILOG_DOWNER)); + (*target_log_flags & XFS_ILOG_DOWNER)); break; } + return 0; +} + +int +xfs_swap_extents( + struct xfs_inode *ip, /* target inode */ + struct xfs_inode *tip, /* tmp inode */ + struct xfs_swapext *sxp) +{ + struct xfs_mount *mp = ip->i_mount; + struct xfs_trans *tp; + struct xfs_bstat *sbp = &sxp->sx_stat; + int src_log_flags, target_log_flags; + int error = 0; + int lock_flags; + struct xfs_ifork *cowfp; + __uint64_t f; + + /* + * Lock the inodes against other IO, page faults and truncate to + * begin with. Then we can ensure the inodes are flushed and have no + * page cache safely. Once we have done this we can take the ilocks and + * do the rest of the checks. + */ + lock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL; + xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL); + xfs_lock_two_inodes(ip, tip, XFS_MMAPLOCK_EXCL); + + /* Verify that both files have the same format */ + if ((VFS_I(ip)->i_mode & S_IFMT) != (VFS_I(tip)->i_mode & S_IFMT)) { + error = -EINVAL; + goto out_unlock; + } + + /* Verify both files are either real-time or non-realtime */ + if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) { + error = -EINVAL; + goto out_unlock; + } + + error = xfs_swap_extent_flush(ip); + if (error) + goto out_unlock; + error = xfs_swap_extent_flush(tip); + if (error) + goto out_unlock; + + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp); + if (error) + goto out_unlock; + + /* + * Lock and join the inodes to the tansaction so that transaction commit + * or cancel will unlock the inodes from this point onwards. + */ + xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL); + lock_flags |= XFS_ILOCK_EXCL; + xfs_trans_ijoin(tp, ip, 0); + xfs_trans_ijoin(tp, tip, 0); + + + /* Verify all data are being swapped */ + if (sxp->sx_offset != 0 || + sxp->sx_length != ip->i_d.di_size || + sxp->sx_length != tip->i_d.di_size) { + error = -EFAULT; + goto out_trans_cancel; + } + + trace_xfs_swap_extent_before(ip, 0); + trace_xfs_swap_extent_before(tip, 1); + + /* check inode formats now that data is flushed */ + error = xfs_swap_extents_check_format(ip, tip); + if (error) { + xfs_notice(mp, + "%s: inode 0x%llx format is incompatible for exchanging.", + __func__, ip->i_ino); + goto out_trans_cancel; + } + + /* + * Compare the current change & modify times with that + * passed in. If they differ, we abort this swap. + * This is the mechanism used to ensure the calling + * process that the file was not changed out from + * under it. + */ + if ((sbp->bs_ctime.tv_sec != VFS_I(ip)->i_ctime.tv_sec) || + (sbp->bs_ctime.tv_nsec != VFS_I(ip)->i_ctime.tv_nsec) || + (sbp->bs_mtime.tv_sec != VFS_I(ip)->i_mtime.tv_sec) || + (sbp->bs_mtime.tv_nsec != VFS_I(ip)->i_mtime.tv_nsec)) { + error = -EBUSY; + goto out_trans_cancel; + } + + /* + * Note the trickiness in setting the log flags - we set the owner log + * flag on the opposite inode (i.e. the inode we are setting the new + * owner to be) because once we swap the forks and log that, log + * recovery is going to see the fork as owned by the swapped inode, + * not the pre-swapped inodes. + */ + src_log_flags = XFS_ILOG_CORE; + target_log_flags = XFS_ILOG_CORE; + + error = xfs_swap_extent_forks(tp, ip, tip, &src_log_flags, + &target_log_flags); + if (error) + goto out_trans_cancel; + /* Do we have to swap reflink flags? */ if ((ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK) ^ (tip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK)) { @@ -1909,16 +1922,16 @@ xfs_swap_extents( trace_xfs_swap_extent_after(ip, 0); trace_xfs_swap_extent_after(tip, 1); -out: - kmem_free(tempifp); - return error; -out_unlock: xfs_iunlock(ip, lock_flags); xfs_iunlock(tip, lock_flags); - goto out; + return error; out_trans_cancel: xfs_trans_cancel(tp); - goto out; + +out_unlock: + xfs_iunlock(ip, lock_flags); + xfs_iunlock(tip, lock_flags); + return error; } -- cgit v1.2.3-59-g8ed1b From 1f08af52e7c981e9877796a2d90b0e0f08666945 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:53 -0700 Subject: xfs: implement swapext for rmap filesystems Implement swapext for filesystems that have reverse mapping. Back in the reflink patches, we augmented the bmap code with a 'REMAP' flag that updates only the bmbt and doesn't touch the allocator and implemented log redo items for those two operations. Now we can rewrite extent swapping as a (looong) series of remap operations. This is far less efficient than the fork swapping method implemented in the past, so we only switch this on for rmap. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_trans_space.h | 9 +++ fs/xfs/xfs_bmap_util.c | 162 +++++++++++++++++++++++++++++++++++++++- fs/xfs/xfs_trace.h | 5 ++ 3 files changed, 173 insertions(+), 3 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_trans_space.h b/fs/xfs/libxfs/xfs_trans_space.h index 41e0428d8175..7917f6e44286 100644 --- a/fs/xfs/libxfs/xfs_trans_space.h +++ b/fs/xfs/libxfs/xfs_trans_space.h @@ -21,6 +21,8 @@ /* * Components of space reservations. */ +#define XFS_MAX_CONTIG_RMAPS_PER_BLOCK(mp) \ + (((mp)->m_rmap_mxr[0]) - ((mp)->m_rmap_mnr[0])) #define XFS_MAX_CONTIG_EXTENTS_PER_BLOCK(mp) \ (((mp)->m_alloc_mxr[0]) - ((mp)->m_alloc_mnr[0])) #define XFS_EXTENTADD_SPACE_RES(mp,w) (XFS_BM_MAXLEVELS(mp,w) - 1) @@ -28,6 +30,13 @@ (((b + XFS_MAX_CONTIG_EXTENTS_PER_BLOCK(mp) - 1) / \ XFS_MAX_CONTIG_EXTENTS_PER_BLOCK(mp)) * \ XFS_EXTENTADD_SPACE_RES(mp,w)) +#define XFS_SWAP_RMAP_SPACE_RES(mp,b,w)\ + (((b + XFS_MAX_CONTIG_EXTENTS_PER_BLOCK(mp) - 1) / \ + XFS_MAX_CONTIG_EXTENTS_PER_BLOCK(mp)) * \ + XFS_EXTENTADD_SPACE_RES(mp,w) + \ + ((b + XFS_MAX_CONTIG_RMAPS_PER_BLOCK(mp) - 1) / \ + XFS_MAX_CONTIG_RMAPS_PER_BLOCK(mp)) * \ + (mp)->m_rmap_maxlevels) #define XFS_DAENTER_1B(mp,w) \ ((w) == XFS_DATA_FORK ? (mp)->m_dir_geo->fsbcount : 1) #define XFS_DAENTER_DBS(mp,w) \ diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index b278d62b7152..552465e011ec 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -1580,6 +1580,13 @@ xfs_swap_extents_check_format( if (ip->i_d.di_nextents < tip->i_d.di_nextents) return -EINVAL; + /* + * If we have to use the (expensive) rmap swap method, we can + * handle any number of extents and any format. + */ + if (xfs_sb_version_hasrmapbt(&ip->i_mount->m_sb)) + return 0; + /* * if the target inode is in extent form and the temp inode is in btree * form then we will end up with the target inode in the wrong format @@ -1649,6 +1656,130 @@ xfs_swap_extent_flush( return 0; } +/* + * Move extents from one file to another, when rmap is enabled. + */ +STATIC int +xfs_swap_extent_rmap( + struct xfs_trans **tpp, + struct xfs_inode *ip, + struct xfs_inode *tip) +{ + struct xfs_bmbt_irec irec; + struct xfs_bmbt_irec uirec; + struct xfs_bmbt_irec tirec; + xfs_fileoff_t offset_fsb; + xfs_fileoff_t end_fsb; + xfs_filblks_t count_fsb; + xfs_fsblock_t firstfsb; + struct xfs_defer_ops dfops; + int error; + xfs_filblks_t ilen; + xfs_filblks_t rlen; + int nimaps; + __uint64_t tip_flags2; + + /* + * If the source file has shared blocks, we must flag the donor + * file as having shared blocks so that we get the shared-block + * rmap functions when we go to fix up the rmaps. The flags + * will be switch for reals later. + */ + tip_flags2 = tip->i_d.di_flags2; + if (ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK) + tip->i_d.di_flags2 |= XFS_DIFLAG2_REFLINK; + + offset_fsb = 0; + end_fsb = XFS_B_TO_FSB(ip->i_mount, i_size_read(VFS_I(ip))); + count_fsb = (xfs_filblks_t)(end_fsb - offset_fsb); + + while (count_fsb) { + /* Read extent from the donor file */ + nimaps = 1; + error = xfs_bmapi_read(tip, offset_fsb, count_fsb, &tirec, + &nimaps, 0); + if (error) + goto out; + ASSERT(nimaps == 1); + ASSERT(tirec.br_startblock != DELAYSTARTBLOCK); + + trace_xfs_swap_extent_rmap_remap(tip, &tirec); + ilen = tirec.br_blockcount; + + /* Unmap the old blocks in the source file. */ + while (tirec.br_blockcount) { + xfs_defer_init(&dfops, &firstfsb); + trace_xfs_swap_extent_rmap_remap_piece(tip, &tirec); + + /* Read extent from the source file */ + nimaps = 1; + error = xfs_bmapi_read(ip, tirec.br_startoff, + tirec.br_blockcount, &irec, + &nimaps, 0); + if (error) + goto out_defer; + ASSERT(nimaps == 1); + ASSERT(tirec.br_startoff == irec.br_startoff); + trace_xfs_swap_extent_rmap_remap_piece(ip, &irec); + + /* Trim the extent. */ + uirec = tirec; + uirec.br_blockcount = rlen = min_t(xfs_filblks_t, + tirec.br_blockcount, + irec.br_blockcount); + trace_xfs_swap_extent_rmap_remap_piece(tip, &uirec); + + /* Remove the mapping from the donor file. */ + error = xfs_bmap_unmap_extent((*tpp)->t_mountp, &dfops, + tip, &uirec); + if (error) + goto out_defer; + + /* Remove the mapping from the source file. */ + error = xfs_bmap_unmap_extent((*tpp)->t_mountp, &dfops, + ip, &irec); + if (error) + goto out_defer; + + /* Map the donor file's blocks into the source file. */ + error = xfs_bmap_map_extent((*tpp)->t_mountp, &dfops, + ip, &uirec); + if (error) + goto out_defer; + + /* Map the source file's blocks into the donor file. */ + error = xfs_bmap_map_extent((*tpp)->t_mountp, &dfops, + tip, &irec); + if (error) + goto out_defer; + + error = xfs_defer_finish(tpp, &dfops, ip); + if (error) + goto out_defer; + + tirec.br_startoff += rlen; + if (tirec.br_startblock != HOLESTARTBLOCK && + tirec.br_startblock != DELAYSTARTBLOCK) + tirec.br_startblock += rlen; + tirec.br_blockcount -= rlen; + } + + /* Roll on... */ + count_fsb -= ilen; + offset_fsb += ilen; + } + + tip->i_d.di_flags2 = tip_flags2; + return 0; + +out_defer: + xfs_defer_cancel(&dfops); +out: + trace_xfs_swap_extent_rmap_error(ip, error, _RET_IP_); + tip->i_d.di_flags2 = tip_flags2; + return error; +} + /* Swap the extents of two files by swapping data forks. */ STATIC int xfs_swap_extent_forks( @@ -1799,6 +1930,7 @@ xfs_swap_extents( int lock_flags; struct xfs_ifork *cowfp; __uint64_t f; + int resblks; /* * Lock the inodes against other IO, page faults and truncate to @@ -1829,7 +1961,28 @@ xfs_swap_extents( if (error) goto out_unlock; - error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp); + /* + * Extent "swapping" with rmap requires a permanent reservation and + * a block reservation because it's really just a remap operation + * performed with log redo items! + */ + if (xfs_sb_version_hasrmapbt(&mp->m_sb)) { + /* + * Conceptually this shouldn't affect the shape of either + * bmbt, but since we atomically move extents one by one, + * we reserve enough space to rebuild both trees. + */ + resblks = XFS_SWAP_RMAP_SPACE_RES(mp, + XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK), + XFS_DATA_FORK) + + XFS_SWAP_RMAP_SPACE_RES(mp, + XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK), + XFS_DATA_FORK); + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, + 0, 0, &tp); + } else + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, + 0, 0, &tp); if (error) goto out_unlock; @@ -1888,8 +2041,11 @@ xfs_swap_extents( src_log_flags = XFS_ILOG_CORE; target_log_flags = XFS_ILOG_CORE; - error = xfs_swap_extent_forks(tp, ip, tip, &src_log_flags, - &target_log_flags); + if (xfs_sb_version_hasrmapbt(&mp->m_sb)) + error = xfs_swap_extent_rmap(&tp, ip, tip); + else + error = xfs_swap_extent_forks(tp, ip, tip, &src_log_flags, + &target_log_flags); if (error) goto out_trans_cancel; diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 75bf18bc275b..2586c9c9cd91 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -3373,6 +3373,11 @@ DEFINE_INODE_EVENT(xfs_reflink_cancel_pending_cow); DEFINE_INODE_IREC_EVENT(xfs_reflink_cancel_cow); DEFINE_INODE_ERROR_EVENT(xfs_reflink_cancel_pending_cow_error); +/* rmap swapext tracepoints */ +DEFINE_INODE_IREC_EVENT(xfs_swap_extent_rmap_remap); +DEFINE_INODE_IREC_EVENT(xfs_swap_extent_rmap_remap_piece); +DEFINE_INODE_ERROR_EVENT(xfs_swap_extent_rmap_error); + #endif /* _TRACE_XFS_H */ #undef TRACE_INCLUDE_PATH -- cgit v1.2.3-59-g8ed1b From 63646fc58d666f149b85ccf470bfc1576a779d4c Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 10 Oct 2016 16:47:32 +1100 Subject: xfs: check inode reflink flag before calling reflink functions There are a couple of places where we don't check the inode's reflink flag before calling into the reflink code. Fix those, and add some asserts so we don't make this mistake again. Signed-off-by: Darrick J. Wong Reported-by: Brian Foster Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- fs/xfs/xfs_reflink.c | 4 ++-- fs/xfs/xfs_super.c | 12 +++++++----- 2 files changed, 9 insertions(+), 7 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 685c419ae011..9c58b4a83248 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -624,6 +624,7 @@ xfs_reflink_cancel_cow_range( int error; trace_xfs_reflink_cancel_cow_range(ip, offset, count); + ASSERT(xfs_is_reflink_inode(ip)); offset_fsb = XFS_B_TO_FSBT(ip->i_mount, offset); if (count == NULLFILEOFF) @@ -1510,8 +1511,7 @@ xfs_reflink_clear_inode_flag( int nmaps; int error = 0; - if (!(ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK)) - return 0; + ASSERT(xfs_is_reflink_inode(ip)); fbno = 0; end = XFS_B_TO_FSB(mp, i_size_read(VFS_I(ip))); diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 72bde2811bd7..ade4691e3f74 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -947,11 +947,13 @@ xfs_fs_destroy_inode( XFS_STATS_INC(ip->i_mount, vn_rele); XFS_STATS_INC(ip->i_mount, vn_remove); - error = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF); - if (error && !XFS_FORCED_SHUTDOWN(ip->i_mount)) - xfs_warn(ip->i_mount, "Error %d while evicting CoW blocks " - "for inode %llu.", - error, ip->i_ino); + if (xfs_is_reflink_inode(ip)) { + error = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF); + if (error && !XFS_FORCED_SHUTDOWN(ip->i_mount)) + xfs_warn(ip->i_mount, +"Error %d while evicting CoW blocks for inode %llu.", + error, ip->i_ino); + } xfs_inactive(ip); -- cgit v1.2.3-59-g8ed1b From 024adf48702212b0af15c682a7ff9773e1e092d6 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 10 Oct 2016 16:47:40 +1100 Subject: xfs: reduce stack usage of _reflink_clear_inode_flag The loop in _reflink_clear_inode_flag isn't necessary since we jump out if any part of any extent is shared. Remove the loop and we no longer need two maps, so we can save some stack use. Signed-off-by: Darrick J. Wong Reported-by: Brian Foster Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- fs/xfs/xfs_reflink.c | 40 ++++++++++++++++------------------------ 1 file changed, 16 insertions(+), 24 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 9c58b4a83248..c4e35dccb803 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1507,7 +1507,7 @@ xfs_reflink_clear_inode_flag( xfs_extlen_t aglen; xfs_agblock_t rbno; xfs_extlen_t rlen; - struct xfs_bmbt_irec map[2]; + struct xfs_bmbt_irec map; int nmaps; int error = 0; @@ -1521,37 +1521,29 @@ xfs_reflink_clear_inode_flag( * Look for extents in the file. Skip holes, delalloc, or * unwritten extents; they can't be reflinked. */ - error = xfs_bmapi_read(ip, fbno, end - fbno, map, &nmaps, 0); + error = xfs_bmapi_read(ip, fbno, end - fbno, &map, &nmaps, 0); if (error) return error; if (nmaps == 0) break; - if (map[0].br_startblock == HOLESTARTBLOCK || - map[0].br_startblock == DELAYSTARTBLOCK || - ISUNWRITTEN(&map[0])) + if (map.br_startblock == HOLESTARTBLOCK || + map.br_startblock == DELAYSTARTBLOCK || + ISUNWRITTEN(&map)) goto next; - map[1] = map[0]; - while (map[1].br_blockcount) { - agno = XFS_FSB_TO_AGNO(mp, map[1].br_startblock); - agbno = XFS_FSB_TO_AGBNO(mp, map[1].br_startblock); - aglen = map[1].br_blockcount; - - error = xfs_reflink_find_shared(mp, agno, agbno, aglen, - &rbno, &rlen, false); - if (error) - return error; - /* Is there still a shared block here? */ - if (rbno != NULLAGBLOCK) - return 0; - - map[1].br_blockcount -= aglen; - map[1].br_startoff += aglen; - map[1].br_startblock += aglen; - } + agno = XFS_FSB_TO_AGNO(mp, map.br_startblock); + agbno = XFS_FSB_TO_AGBNO(mp, map.br_startblock); + aglen = map.br_blockcount; + error = xfs_reflink_find_shared(mp, agno, agbno, aglen, + &rbno, &rlen, false); + if (error) + return error; + /* Is there still a shared block here? */ + if (rbno != NULLAGBLOCK) + return 0; next: - fbno = map[0].br_startoff + map[0].br_blockcount; + fbno = map.br_startoff + map.br_blockcount; } /* -- cgit v1.2.3-59-g8ed1b From 97a1b87ea7b2884fa9516c646385ca25475c4760 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 10 Oct 2016 16:49:01 +1100 Subject: xfs: remove isize check from unshare operation Now that fallocate has an explicit unshare flag again, let's try to remove the inode reflink flag whenever the user unshares any part of a file since checking is cheap compared to the CoW. Signed-off-by: Darrick J. Wong Reported-by: Brian Foster Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- fs/xfs/xfs_reflink.c | 18 ++++++------------ 1 file changed, 6 insertions(+), 12 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index c4e35dccb803..220d2638bb84 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1570,8 +1570,7 @@ next: */ STATIC int xfs_reflink_try_clear_inode_flag( - struct xfs_inode *ip, - xfs_off_t old_isize) + struct xfs_inode *ip) { struct xfs_mount *mp = ip->i_mount; struct xfs_trans *tp; @@ -1585,9 +1584,6 @@ xfs_reflink_try_clear_inode_flag( xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, 0); - if (old_isize != i_size_read(VFS_I(ip))) - goto cancel; - error = xfs_reflink_clear_inode_flag(ip, &tp); if (error) goto cancel; @@ -1630,7 +1626,7 @@ xfs_reflink_unshare( /* Try to CoW the selected ranges */ xfs_ilock(ip, XFS_ILOCK_EXCL); - fbno = XFS_B_TO_FSB(mp, offset); + fbno = XFS_B_TO_FSBT(mp, offset); isize = i_size_read(VFS_I(ip)); end = XFS_B_TO_FSB(mp, offset + len); error = xfs_reflink_dirty_extents(ip, fbno, end, isize); @@ -1643,12 +1639,10 @@ xfs_reflink_unshare( if (error) goto out; - /* Turn off the reflink flag if we unshared the whole file */ - if (offset == 0 && len == isize) { - error = xfs_reflink_try_clear_inode_flag(ip, isize); - if (error) - goto out; - } + /* Turn off the reflink flag if possible. */ + error = xfs_reflink_try_clear_inode_flag(ip); + if (error) + goto out; return 0; -- cgit v1.2.3-59-g8ed1b From 93fed47013b3c17318968cad0e81bd74196798c4 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 10 Oct 2016 16:49:10 +1100 Subject: xfs: fix label inaccuracies Since we don't unlock anything on the way out, change the label. Signed-off-by: Darrick J. Wong Reported-by: Brian Foster Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- fs/xfs/xfs_file.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 54c27edb74bc..710ee1140f16 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1098,19 +1098,19 @@ xfs_file_share_range( /* Wait for the completion of any pending IOs on srcfile */ ret = xfs_file_wait_for_io(inode_in, pos_in, len); if (ret) - goto out_unlock; + goto out; ret = xfs_file_wait_for_io(inode_out, pos_out, len); if (ret) - goto out_unlock; + goto out; if (is_dedupe) flags |= XFS_REFLINK_DEDUPE; ret = xfs_reflink_remap_range(XFS_I(inode_in), pos_in, XFS_I(inode_out), pos_out, len, flags); if (ret < 0) - goto out_unlock; + goto out; -out_unlock: +out: return ret; } -- cgit v1.2.3-59-g8ed1b From 9780643cde26406d324413ae5c51e772144533bc Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 10 Oct 2016 16:49:18 +1100 Subject: xfs: fix error initialization Eric Sandeen reported a gcc complaint about uninitialized error variables, so fix that. Signed-off-by: Darrick J. Wong Reported-by: Eric Sandeen Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- fs/xfs/xfs_reflink.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 220d2638bb84..5965e9455d91 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1437,7 +1437,7 @@ xfs_reflink_dirty_extents( xfs_off_t flen; struct xfs_bmbt_irec map[2]; int nmaps; - int error; + int error = 0; while (end - fbno > 0) { nmaps = 1; -- cgit v1.2.3-59-g8ed1b From 1987fd743415564e8c67f2f7ec0ae3c18a6b11cd Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 10 Oct 2016 16:49:29 +1100 Subject: xfs: clear reflink flag if setting realtime flag Since we can only turn on the rt flag if there are no data extents, we can safely turn off the reflink flag if the rt flag is being turned on. Signed-off-by: Darrick J. Wong Reported-by: Brian Foster Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- fs/xfs/xfs_ioctl.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 8b9f31c54c1e..598b97bb19da 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1034,9 +1034,9 @@ xfs_ioctl_setattr_xflags( return -EINVAL; } - /* Don't allow us to set realtime mode for a reflinked file. */ + /* Clear reflink if we are actually able to set the rt flag. */ if ((fa->fsx_xflags & FS_XFLAG_REALTIME) && xfs_is_reflink_inode(ip)) - return -EINVAL; + ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK; /* Don't allow us to set DAX mode for a reflinked file for now. */ if ((fa->fsx_xflags & FS_XFLAG_DAX) && xfs_is_reflink_inode(ip)) -- cgit v1.2.3-59-g8ed1b From 6f97077ff6ef28e0f3b361b6ba9c95a222ef384b Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 10 Oct 2016 17:23:07 +1100 Subject: xfs: rework refcount cow recovery error handling The error handling in xfs_refcount_recover_cow_leftovers is confused and can potentially leak memory, so rework it to release resources correctly on error. Signed-off-by: Darrick J. Wong Reported-by: Brian Foster Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- fs/xfs/libxfs/xfs_refcount.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c index 56bfef116423..b177ef33cd4c 100644 --- a/fs/xfs/libxfs/xfs_refcount.c +++ b/fs/xfs/libxfs/xfs_refcount.c @@ -1643,7 +1643,7 @@ xfs_refcount_recover_cow_leftovers( error = xfs_btree_query_range(cur, &low, &high, xfs_refcount_recover_extent, &debris); if (error) - goto out_error; + goto out_cursor; xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR); xfs_buf_relse(agbp); @@ -1675,14 +1675,8 @@ xfs_refcount_recover_cow_leftovers( error = xfs_trans_commit(tp); if (error) - goto out_cancel; + goto out_free; } - goto out_free; - -out_defer: - xfs_defer_cancel(&dfops); -out_cancel: - xfs_trans_cancel(tp); out_free: /* Free the leftover list */ @@ -1690,11 +1684,15 @@ out_free: list_del(&rr->rr_list); kmem_free(rr); } - return error; -out_error: +out_cursor: xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); xfs_buf_relse(agbp); - return error; + goto out_free; + +out_defer: + xfs_defer_cancel(&dfops); + xfs_trans_cancel(tp); + goto out_free; } -- cgit v1.2.3-59-g8ed1b From feac470e3642e8956ac9b7f14224e6b301b9219d Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 11 Oct 2016 09:03:19 +1100 Subject: xfs: convert COW blocks to real blocks before unwritten extent conversion We need to splice COW blocks we've completed in xfs_end_io_direct_write into the data fork before converting unwritten extents. Otherwise xfs_bmapi_write might first allocate blocks for any holes in the data fork, which isn't only not needed but also harmful as it might cause reserved block underruns in the transaction. Signed-off-by: Christoph Hellwig Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- fs/xfs/xfs_aops.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 0e2a931fa725..3e57a56cf829 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -1547,13 +1547,13 @@ xfs_end_io_direct_write( i_size_write(inode, offset + size); spin_unlock(&ip->i_flags_lock); + if (flags & XFS_DIO_FLAG_COW) + error = xfs_reflink_end_cow(ip, offset, size); if (flags & XFS_DIO_FLAG_UNWRITTEN) { trace_xfs_end_io_direct_write_unwritten(ip, offset, size); error = xfs_iomap_write_unwritten(ip, offset, size); } - if (flags & XFS_DIO_FLAG_COW) - error = xfs_reflink_end_cow(ip, offset, size); if (flags & XFS_DIO_FLAG_APPEND) { trace_xfs_end_io_direct_write_append(ip, offset, size); -- cgit v1.2.3-59-g8ed1b