[PATCH] xfs: check directory data block header padding in scrub

[Yuto Ohnuki <ytohnuki@amazon.com>]

The pad field in xfs_dir3_data_hdr exists for 64-bit alignment and
should always be zero. The scrub code already checks the pad field for
leaf and free block headers but was missing the same check for data
block headers. Add the missing check.

Signed-off-by: Yuto Ohnuki <ytohnuki@amazon.com>
---
 fs/xfs/scrub/dir.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/scrub/dir.c b/fs/xfs/scrub/dir.c
index e09724cd3725..2db4def3358c 100644
--- a/fs/xfs/scrub/dir.c
+++ b/fs/xfs/scrub/dir.c
@@ -492,7 +492,12 @@ xchk_directory_data_bestfree(
 		goto out;
 	xchk_buffer_recheck(sc, bp);
 
-	/* XXX: Check xfs_dir3_data_hdr.pad is zero once we start setting it. */
+	if (xfs_has_crc(sc->mp)) {
+		struct xfs_dir3_data_hdr    *hdr3 = bp->b_addr;
+
+		if (hdr3->pad != cpu_to_be32(0))
+			xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
+	}
 
 	if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
 		goto out_buf;
-- 
2.50.1




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