diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_alloc.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_alloc.h | 41 |
1 files changed, 5 insertions, 36 deletions
diff --git a/fs/xfs/libxfs/xfs_alloc.h b/fs/xfs/libxfs/xfs_alloc.h index 88053422fda0..360f9e425536 100644 --- a/fs/xfs/libxfs/xfs_alloc.h +++ b/fs/xfs/libxfs/xfs_alloc.h @@ -56,42 +56,6 @@ typedef unsigned int xfs_alloctype_t; #define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/ /* - * In order to avoid ENOSPC-related deadlock caused by - * out-of-order locking of AGF buffer (PV 947395), we place - * constraints on the relationship among actual allocations for - * data blocks, freelist blocks, and potential file data bmap - * btree blocks. However, these restrictions may result in no - * actual space allocated for a delayed extent, for example, a data - * block in a certain AG is allocated but there is no additional - * block for the additional bmap btree block due to a split of the - * bmap btree of the file. The result of this may lead to an - * infinite loop in xfssyncd when the file gets flushed to disk and - * all delayed extents need to be actually allocated. To get around - * this, we explicitly set aside a few blocks which will not be - * reserved in delayed allocation. Considering the minimum number of - * needed freelist blocks is 4 fsbs _per AG_, a potential split of file's bmap - * btree requires 1 fsb, so we set the number of set-aside blocks - * to 4 + 4*agcount. - */ -#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. @@ -133,6 +97,11 @@ typedef struct xfs_alloc_arg { #define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */ #define XFS_ALLOC_USERDATA_ZERO (1 << 2)/* zero extent on allocation */ +/* freespace limit calculations */ +#define XFS_ALLOC_AGFL_RESERVE 4 +unsigned int xfs_alloc_set_aside(struct xfs_mount *mp); +unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp); + xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_mount *mp, struct xfs_perag *pag, xfs_extlen_t need); unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp, |