diff options
| author | Brian Foster <bfoster@redhat.com> | 2015-05-29 08:51:37 +1000 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2015-05-29 08:51:37 +1000 |
| commit | 999633d304f2467ae48104ea218b1e8fb0303d40 (patch) | |
| tree | 22befdb55796ab74b26ec1d592c7c892952b8280 | |
| parent | d4cc540b08e95386777b7e644fb384c2adc0da32 (diff) | |
xfs: update free inode record logic to support sparse inode records
xfs_difree_inobt() uses logic in a couple places that assume inobt
records refer to fully allocated chunks. Specifically, the use of
mp->m_ialloc_inos can cause problems for inode chunks that are sparsely
allocated. Sparse inode chunks can, by definition, define a smaller
number of inodes than a full inode chunk.
Fix the logic that determines whether an inode record should be removed
from the inobt to use the ir_free mask rather than ir_freecount. Fix the
agi counters modification to use ir_freecount to add the actual number
of inodes freed rather than assuming a full inode chunk.
Also make sure that we preserve the behavior to not remove inode chunks
if the block size is large enough for multiple inode chunks (e.g.,
bsize=64k, isize=512). This behavior was previously implicit in that in
such configurations, ir.freecount of a single record never matches
m_ialloc_inos. Hence, add some comments as well.
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
| -rw-r--r-- | fs/xfs/libxfs/xfs_ialloc.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c index a1868319b602..303309996a9f 100644 --- a/fs/xfs/libxfs/xfs_ialloc.c +++ b/fs/xfs/libxfs/xfs_ialloc.c @@ -1508,10 +1508,13 @@ xfs_difree_inobt( rec.ir_freecount++; /* - * When an inode cluster is free, it becomes eligible for removal + * When an inode chunk is free, it becomes eligible for removal. Don't + * remove the chunk if the block size is large enough for multiple inode + * chunks (that might not be free). */ if (!(mp->m_flags & XFS_MOUNT_IKEEP) && - (rec.ir_freecount == mp->m_ialloc_inos)) { + rec.ir_free == XFS_INOBT_ALL_FREE && + mp->m_sb.sb_inopblock <= XFS_INODES_PER_CHUNK) { *deleted = 1; *first_ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino); @@ -1521,7 +1524,7 @@ xfs_difree_inobt( * AGI and Superblock inode counts, and mark the disk space * to be freed when the transaction is committed. */ - ilen = mp->m_ialloc_inos; + ilen = rec.ir_freecount; be32_add_cpu(&agi->agi_count, -ilen); be32_add_cpu(&agi->agi_freecount, -(ilen - 1)); xfs_ialloc_log_agi(tp, agbp, XFS_AGI_COUNT | XFS_AGI_FREECOUNT); @@ -1641,8 +1644,13 @@ xfs_difree_finobt( * free inode. Hence, if all of the inodes are free and we aren't * keeping inode chunks permanently on disk, remove the record. * Otherwise, update the record with the new information. + * + * Note that we currently can't free chunks when the block size is large + * enough for multiple chunks. Leave the finobt record to remain in sync + * with the inobt. */ - if (rec.ir_freecount == mp->m_ialloc_inos && + if (rec.ir_free == XFS_INOBT_ALL_FREE && + mp->m_sb.sb_inopblock <= XFS_INODES_PER_CHUNK && !(mp->m_flags & XFS_MOUNT_IKEEP)) { error = xfs_btree_delete(cur, &i); if (error) |