[3/3] xfs: use the directory name hash function for dir scrubbing

Commit Message

Darrick J. Wong April 4, 2023, 5:07 p.m. UTC

From: Darrick J. Wong <[e-mail]>

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 <[e-mail]>
---
 fs/xfs/scrub/dir.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Patch

diff --git a/fs/xfs/scrub/dir.c b/fs/xfs/scrub/dir.c
index d1b0f23c2c59..aeb815a483ff 100644
--- a/fs/xfs/scrub/dir.c
+++ b/fs/xfs/scrub/dir.c
@@ -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);