diff options
Diffstat (limited to '')
| -rw-r--r-- | fs/xfs/xfs_alloc.h | 41 |
1 files changed, 36 insertions, 5 deletions
diff --git a/fs/xfs/xfs_alloc.h b/fs/xfs/xfs_alloc.h index 895009a97271..d0b3bc72005b 100644 --- a/fs/xfs/xfs_alloc.h +++ b/fs/xfs/xfs_alloc.h @@ -19,6 +19,7 @@ #define __XFS_ALLOC_H__ struct xfs_buf; +struct xfs_btree_cur; struct xfs_mount; struct xfs_perag; struct xfs_trans; @@ -74,6 +75,22 @@ typedef unsigned int xfs_alloctype_t; #define XFS_ALLOC_SET_ASIDE(mp) (4 + ((mp)->m_sb.sb_agcount * 4)) /* + * When deciding how much space to allocate out of an AG, we limit the + * allocation maximum size to the size the AG. However, we cannot use all the + * blocks in the AG - some are permanently used by metadata. These + * blocks are generally: + * - the AG superblock, AGF, AGI and AGFL + * - the AGF (bno and cnt) and AGI btree root blocks + * - 4 blocks on the AGFL according to XFS_ALLOC_SET_ASIDE() limits + * + * The AG headers are sector sized, so the amount of space they take up is + * dependent on filesystem geometry. The others are all single blocks. + */ +#define XFS_ALLOC_AG_MAX_USABLE(mp) \ + ((mp)->m_sb.sb_agblocks - XFS_BB_TO_FSB(mp, XFS_FSS_TO_BB(mp, 4)) - 7) + + +/* * Argument structure for xfs_alloc routines. * This is turned into a structure to avoid having 20 arguments passed * down several levels of the stack. @@ -118,16 +135,16 @@ xfs_alloc_longest_free_extent(struct xfs_mount *mp, struct xfs_perag *pag); #ifdef __KERNEL__ - void -xfs_alloc_busy_insert(xfs_trans_t *tp, - xfs_agnumber_t agno, - xfs_agblock_t bno, - xfs_extlen_t len); +xfs_alloc_busy_insert(struct xfs_trans *tp, xfs_agnumber_t agno, + xfs_agblock_t bno, xfs_extlen_t len); void xfs_alloc_busy_clear(struct xfs_mount *mp, struct xfs_busy_extent *busyp); +int +xfs_alloc_busy_search(struct xfs_mount *mp, xfs_agnumber_t agno, + xfs_agblock_t bno, xfs_extlen_t len); #endif /* __KERNEL__ */ /* @@ -205,4 +222,18 @@ xfs_free_extent( xfs_fsblock_t bno, /* starting block number of extent */ xfs_extlen_t len); /* length of extent */ +int /* error */ +xfs_alloc_lookup_le( + struct xfs_btree_cur *cur, /* btree cursor */ + xfs_agblock_t bno, /* starting block of extent */ + xfs_extlen_t len, /* length of extent */ + int *stat); /* success/failure */ + +int /* error */ +xfs_alloc_get_rec( + struct xfs_btree_cur *cur, /* btree cursor */ + xfs_agblock_t *bno, /* output: starting block of extent */ + xfs_extlen_t *len, /* output: length of extent */ + int *stat); /* output: success/failure */ + #endif /* __XFS_ALLOC_H__ */ |