diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_btree.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_btree.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c index 619319ff41e5..120280c998f8 100644 --- a/fs/xfs/libxfs/xfs_btree.c +++ b/fs/xfs/libxfs/xfs_btree.c @@ -27,6 +27,13 @@ * Cursor allocation zone. */ kmem_zone_t *xfs_btree_cur_zone; +struct xfs_btree_cur_zone xfs_btree_cur_zones[XFS_BTNUM_MAX] = { + [XFS_BTNUM_BNO] = { .name = "xfs_alloc_btree_cur" }, + [XFS_BTNUM_INO] = { .name = "xfs_ialloc_btree_cur" }, + [XFS_BTNUM_RMAP] = { .name = "xfs_rmap_btree_cur" }, + [XFS_BTNUM_REFC] = { .name = "xfs_refc_btree_cur" }, + [XFS_BTNUM_BMAP] = { .name = "xfs_bmap_btree_cur" }, +}; /* * Btree magic numbers. @@ -5027,3 +5034,44 @@ xfs_btree_alloc_cursor( return cur; } + +/* + * Compute absolute minrecs for leaf and node btree blocks. Callers should set + * BTREE_LONG_PTRS and BTREE_OVERLAPPING as they would for regular cursors. + * Set BTREE_CRC_BLOCKS if the btree type is supported on V5 or newer + * filesystems. + */ +void +xfs_btree_absolute_minrecs( + unsigned int *minrecs, + unsigned int bc_flags, + unsigned int leaf_recbytes, + unsigned int node_recbytes) +{ + unsigned int min_recbytes; + + /* + * If this btree type is supported on V4, we use the smaller V4 min + * block size along with the V4 header size. If the btree type is only + * supported on V5, use the (twice as large) V5 min block size along + * with the V5 header size. + */ + if (!(bc_flags & XFS_BTREE_CRC_BLOCKS)) { + if (bc_flags & XFS_BTREE_LONG_PTRS) + min_recbytes = XFS_MIN_BLOCKSIZE - + XFS_BTREE_LBLOCK_LEN; + else + min_recbytes = XFS_MIN_BLOCKSIZE - + XFS_BTREE_SBLOCK_LEN; + } else if (bc_flags & XFS_BTREE_LONG_PTRS) { + min_recbytes = XFS_MIN_CRC_BLOCKSIZE - XFS_BTREE_LBLOCK_CRC_LEN; + } else { + min_recbytes = XFS_MIN_CRC_BLOCKSIZE - XFS_BTREE_SBLOCK_CRC_LEN; + } + + if (bc_flags & XFS_BTREE_OVERLAPPING) + node_recbytes <<= 1; + + minrecs[0] = min_recbytes / (2 * leaf_recbytes); + minrecs[1] = min_recbytes / (2 * node_recbytes); +} |