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xfs: use the directory name hash function for dir scrubbing

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The directory code has a directory-specific hash computation function
that includes a modified hash function for case-insensitive lookups.
Hence we must use that function (and not the raw da_hashname) when
checking the dabtree structure.

Found by accidentally breaking xfs/188 to create an abnormally huge
case-insensitive directory and watching scrub break.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2023-04-11 19:00:16 -07:00
parent 30f8ee5e7e
commit 9dceccc582
1 changed files with 6 additions and 1 deletions
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7
fs/xfs/scrub/dir.c
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@ -201,6 +201,7 @@ xchk_dir_rec(
struct xchk_da_btree *ds,
int level)
{
struct xfs_name dname = { };
struct xfs_da_state_blk *blk = &ds->state->path.blk[level];
struct xfs_mount *mp = ds->state->mp;
struct xfs_inode *dp = ds->dargs.dp;
@ -297,7 +298,11 @@ xchk_dir_rec(
xchk_fblock_set_corrupt(ds->sc, XFS_DATA_FORK, rec_bno);
goto out_relse;
}
calc_hash = xfs_da_hashname(dent->name, dent->namelen);
/* Does the directory hash match? */
dname.name = dent->name;
dname.len = dent->namelen;
calc_hash = xfs_dir2_hashname(mp, &dname);
if (calc_hash != hash)
xchk_fblock_set_corrupt(ds->sc, XFS_DATA_FORK, rec_bno);