diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_refcount_btree.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_refcount_btree.c | 37 |
1 files changed, 33 insertions, 4 deletions
diff --git a/fs/xfs/libxfs/xfs_refcount_btree.c b/fs/xfs/libxfs/xfs_refcount_btree.c index 995b0d86ddc0..3bf802fc33bb 100644 --- a/fs/xfs/libxfs/xfs_refcount_btree.c +++ b/fs/xfs/libxfs/xfs_refcount_btree.c @@ -393,6 +393,18 @@ 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. */ @@ -402,11 +414,22 @@ 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. */ @@ -414,8 +437,14 @@ 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. */ |