diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_refcount_btree.c')
-rw-r--r-- | fs/xfs/libxfs/xfs_refcount_btree.c | 65 |
1 files changed, 56 insertions, 9 deletions
diff --git a/fs/xfs/libxfs/xfs_refcount_btree.c b/fs/xfs/libxfs/xfs_refcount_btree.c index 1ef9b99962ab..d14c1720b0fb 100644 --- a/fs/xfs/libxfs/xfs_refcount_btree.c +++ b/fs/xfs/libxfs/xfs_refcount_btree.c @@ -21,6 +21,8 @@ #include "xfs_rmap.h" #include "xfs_ag.h" +static struct kmem_cache *xfs_refcountbt_cur_cache; + static struct xfs_btree_cur * xfs_refcountbt_dup_cursor( struct xfs_btree_cur *cur) @@ -322,11 +324,8 @@ xfs_refcountbt_init_common( ASSERT(pag->pag_agno < mp->m_sb.sb_agcount); - cur = kmem_cache_zalloc(xfs_btree_cur_zone, GFP_NOFS | __GFP_NOFAIL); - cur->bc_tp = tp; - cur->bc_mp = mp; - cur->bc_btnum = XFS_BTNUM_REFC; - cur->bc_blocklog = mp->m_sb.sb_blocklog; + cur = xfs_btree_alloc_cursor(mp, tp, XFS_BTNUM_REFC, + mp->m_refc_maxlevels, xfs_refcountbt_cur_cache); cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_refcbt_2); cur->bc_flags |= XFS_BTREE_CRC_BLOCKS; @@ -396,6 +395,18 @@ xfs_refcountbt_commit_staged_btree( xfs_btree_commit_afakeroot(cur, tp, agbp, &xfs_refcountbt_ops); } +/* Calculate number of records in a refcount btree block. */ +static inline unsigned int +xfs_refcountbt_block_maxrecs( + unsigned int blocklen, + bool leaf) +{ + if (leaf) + return blocklen / sizeof(struct xfs_refcount_rec); + return blocklen / (sizeof(struct xfs_refcount_key) + + sizeof(xfs_refcount_ptr_t)); +} + /* * Calculate the number of records in a refcount btree block. */ @@ -405,11 +416,22 @@ xfs_refcountbt_maxrecs( bool leaf) { blocklen -= XFS_REFCOUNT_BLOCK_LEN; + return xfs_refcountbt_block_maxrecs(blocklen, leaf); +} - if (leaf) - return blocklen / sizeof(struct xfs_refcount_rec); - return blocklen / (sizeof(struct xfs_refcount_key) + - sizeof(xfs_refcount_ptr_t)); +/* Compute the max possible height of the maximally sized refcount btree. */ +unsigned int +xfs_refcountbt_maxlevels_ondisk(void) +{ + unsigned int minrecs[2]; + unsigned int blocklen; + + blocklen = XFS_MIN_CRC_BLOCKSIZE - XFS_BTREE_SBLOCK_CRC_LEN; + + minrecs[0] = xfs_refcountbt_block_maxrecs(blocklen, true) / 2; + minrecs[1] = xfs_refcountbt_block_maxrecs(blocklen, false) / 2; + + return xfs_btree_compute_maxlevels(minrecs, XFS_MAX_CRC_AG_BLOCKS); } /* Compute the maximum height of a refcount btree. */ @@ -417,8 +439,14 @@ void xfs_refcountbt_compute_maxlevels( struct xfs_mount *mp) { + if (!xfs_has_reflink(mp)) { + mp->m_refc_maxlevels = 0; + return; + } + mp->m_refc_maxlevels = xfs_btree_compute_maxlevels( mp->m_refc_mnr, mp->m_sb.sb_agblocks); + ASSERT(mp->m_refc_maxlevels <= xfs_refcountbt_maxlevels_ondisk()); } /* Calculate the refcount btree size for some records. */ @@ -488,3 +516,22 @@ xfs_refcountbt_calc_reserves( return error; } + +int __init +xfs_refcountbt_init_cur_cache(void) +{ + xfs_refcountbt_cur_cache = kmem_cache_create("xfs_refcbt_cur", + xfs_btree_cur_sizeof(xfs_refcountbt_maxlevels_ondisk()), + 0, 0, NULL); + + if (!xfs_refcountbt_cur_cache) + return -ENOMEM; + return 0; +} + +void +xfs_refcountbt_destroy_cur_cache(void) +{ + kmem_cache_destroy(xfs_refcountbt_cur_cache); + xfs_refcountbt_cur_cache = NULL; +} |