xfs: add bmapi nodiscard flag

Freed extents are unconditionally discarded when online discard is
enabled. Define XFS_BMAPI_NODISCARD to allow callers to bypass
discards when unnecessary. For example, this will be useful for
eofblocks trimming.

This patch does not change behavior.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

4 files changed, 75 insertions, 12 deletions

diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index 350ad203b082..5410635893df 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -3009,18 +3009,20 @@ out:
  * after fixing up the freelist.
  */
 int				/* error */
-xfs_free_extent(
+__xfs_free_extent(
 	struct xfs_trans	*tp,	/* transaction pointer */
 	xfs_fsblock_t		bno,	/* starting block number of extent */
 	xfs_extlen_t		len,	/* length of extent */
 	struct xfs_owner_info	*oinfo,	/* extent owner */
-	enum xfs_ag_resv_type	type)	/* block reservation type */
+	enum xfs_ag_resv_type	type,	/* block reservation type */
+	bool			skip_discard)
 {
 	struct xfs_mount	*mp = tp->t_mountp;
 	struct xfs_buf		*agbp;
 	xfs_agnumber_t		agno = XFS_FSB_TO_AGNO(mp, bno);
 	xfs_agblock_t		agbno = XFS_FSB_TO_AGBNO(mp, bno);
 	int			error;
+	unsigned int		busy_flags = 0;
 
 	ASSERT(len != 0);
 	ASSERT(type != XFS_AG_RESV_AGFL);
@@ -3044,7 +3046,9 @@ xfs_free_extent(
 	if (error)
 		goto err;
 
-	xfs_extent_busy_insert(tp, agno, agbno, len, 0);
+	if (skip_discard)
+		busy_flags |= XFS_EXTENT_BUSY_SKIP_DISCARD;
+	xfs_extent_busy_insert(tp, agno, agbno, len, busy_flags);
 	return 0;
 
 err:
diff --git a/fs/xfs/libxfs/xfs_alloc.h b/fs/xfs/libxfs/xfs_alloc.h
index 949e21326066..1dcac78586b4 100644
--- a/fs/xfs/libxfs/xfs_alloc.h
+++ b/fs/xfs/libxfs/xfs_alloc.h
@@ -191,12 +191,35 @@ xfs_alloc_vextent(
  * Free an extent.
  */
 int				/* error */
-xfs_free_extent(
+__xfs_free_extent(
 	struct xfs_trans	*tp,	/* transaction pointer */
 	xfs_fsblock_t		bno,	/* starting block number of extent */
 	xfs_extlen_t		len,	/* length of extent */
 	struct xfs_owner_info	*oinfo,	/* extent owner */
-	enum xfs_ag_resv_type	type);	/* block reservation type */
+	enum xfs_ag_resv_type	type,	/* block reservation type */
+	bool			skip_discard);
+
+static inline int
+xfs_free_extent(
+	struct xfs_trans	*tp,
+	xfs_fsblock_t		bno,
+	xfs_extlen_t		len,
+	struct xfs_owner_info	*oinfo,
+	enum xfs_ag_resv_type	type)
+{
+	return __xfs_free_extent(tp, bno, len, oinfo, type, false);
+}
+
+static inline int
+xfs_free_extent_nodiscard(
+	struct xfs_trans	*tp,
+	xfs_fsblock_t		bno,
+	xfs_extlen_t		len,
+	struct xfs_owner_info	*oinfo,
+	enum xfs_ag_resv_type	type)
+{
+	return __xfs_free_extent(tp, bno, len, oinfo, type, true);
+}
 
 int				/* error */
 xfs_alloc_lookup_le(
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 3e5e9a667bc8..534ffb856c4a 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -544,12 +544,13 @@ xfs_bmap_validate_ret(
  * The list is maintained sorted (by block number).
  */
 void
-xfs_bmap_add_free(
+__xfs_bmap_add_free(
 	struct xfs_mount		*mp,
 	struct xfs_defer_ops		*dfops,
 	xfs_fsblock_t			bno,
 	xfs_filblks_t			len,
-	struct xfs_owner_info		*oinfo)
+	struct xfs_owner_info		*oinfo,
+	bool				skip_discard)
 {
 	struct xfs_extent_free_item	*new;		/* new element */
 #ifdef DEBUG
@@ -576,6 +577,7 @@ xfs_bmap_add_free(
 		new->xefi_oinfo = *oinfo;
 	else
 		xfs_rmap_skip_owner_update(&new->xefi_oinfo);
+	new->xefi_skip_discard = skip_discard;
 	trace_xfs_bmap_free_defer(mp, XFS_FSB_TO_AGNO(mp, bno), 0,
 			XFS_FSB_TO_AGBNO(mp, bno), len);
 	xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_FREE, &new->xefi_list);
@@ -5106,9 +5108,16 @@ xfs_bmap_del_extent_real(
 			error = xfs_refcount_decrease_extent(mp, dfops, del);
 			if (error)
 				goto done;
-		} else
-			xfs_bmap_add_free(mp, dfops, del->br_startblock,
+		} else {
+			if (bflags & XFS_BMAPI_NODISCARD) {
+				xfs_bmap_add_free_nodiscard(mp, dfops,
+					del->br_startblock, del->br_blockcount,
+					NULL);
+			} else {
+				xfs_bmap_add_free(mp, dfops, del->br_startblock,
 					del->br_blockcount, NULL);
+			}
+		}
 	}
 
 	/*
diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h
index 2b766b37096d..8d8946bfdd8c 100644
--- a/fs/xfs/libxfs/xfs_bmap.h
+++ b/fs/xfs/libxfs/xfs_bmap.h
@@ -68,6 +68,7 @@ struct xfs_extent_free_item
 	xfs_extlen_t		xefi_blockcount;/* number of blocks in extent */
 	struct list_head	xefi_list;
 	struct xfs_owner_info	xefi_oinfo;	/* extent owner */
+	bool			xefi_skip_discard;
 };
 
 #define	XFS_BMAP_MAX_NMAP	4
@@ -116,6 +117,9 @@ struct xfs_extent_free_item
 /* Only convert unwritten extents, don't allocate new blocks */
 #define XFS_BMAPI_CONVERT_ONLY	0x800
 
+/* Skip online discard of freed extents */
+#define XFS_BMAPI_NODISCARD	0x1000
+
 #define XFS_BMAPI_FLAGS \
 	{ XFS_BMAPI_ENTIRE,	"ENTIRE" }, \
 	{ XFS_BMAPI_METADATA,	"METADATA" }, \
@@ -128,7 +132,8 @@ struct xfs_extent_free_item
 	{ XFS_BMAPI_REMAP,	"REMAP" }, \
 	{ XFS_BMAPI_COWFORK,	"COWFORK" }, \
 	{ XFS_BMAPI_DELALLOC,	"DELALLOC" }, \
-	{ XFS_BMAPI_CONVERT_ONLY, "CONVERT_ONLY" }
+	{ XFS_BMAPI_CONVERT_ONLY, "CONVERT_ONLY" }, \
+	{ XFS_BMAPI_NODISCARD,	"NODISCARD" }
 
 
 static inline int xfs_bmapi_aflag(int w)
@@ -192,9 +197,9 @@ void	xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
 void	xfs_trim_extent_eof(struct xfs_bmbt_irec *, struct xfs_inode *);
 int	xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
 void	xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork);
-void	xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
+void	__xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
 			  xfs_fsblock_t bno, xfs_filblks_t len,
-			  struct xfs_owner_info *oinfo);
+			  struct xfs_owner_info *oinfo, bool skip_discard);
 void	xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork);
 int	xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip,
 		xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork);
@@ -240,6 +245,28 @@ int	xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork,
 		struct xfs_bmbt_irec *got, struct xfs_iext_cursor *cur,
 		int eof);
 
+static inline void
+xfs_bmap_add_free(
+	struct xfs_mount		*mp,
+	struct xfs_defer_ops		*dfops,
+	xfs_fsblock_t			bno,
+	xfs_filblks_t			len,
+	struct xfs_owner_info		*oinfo)
+{
+	__xfs_bmap_add_free(mp, dfops, bno, len, oinfo, false);
+}
+
+static inline void
+xfs_bmap_add_free_nodiscard(
+	struct xfs_mount		*mp,
+	struct xfs_defer_ops		*dfops,
+	xfs_fsblock_t			bno,
+	xfs_filblks_t			len,
+	struct xfs_owner_info		*oinfo)
+{
+	__xfs_bmap_add_free(mp, dfops, bno, len, oinfo, true);
+}
+
 enum xfs_bmap_intent_type {
 	XFS_BMAP_MAP = 1,
 	XFS_BMAP_UNMAP,