[PATCH 07/11] xfs_repair: force not-so-bad bmbt blocks back through the verifier

Darrick J. Wong
2015-08-26T00:33:09Z

If during prefetch we encounter a bmbt block that fails the CRC check
due to corruption in the unused part of the block, force the buffer
back through the non-prefetch verifiers later so that the CRC is
updated. Otherwise, the bad checksum goes unfixed and the kernel will
still flag the bmbt block as invalid.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
repair/prefetch.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/repair/prefetch.c b/repair/prefetch.c
index 1de3ec0..77d29c8 100644
--- a/repair/prefetch.c
+++ b/repair/prefetch.c
@@ -276,6 +276,14 @@ pf_scan_lbtree(

XFS_BUF_SET_PRIORITY(bp, isadir ? B_DIR_BMAP : B_BMAP);

+ /*
+ * Make this bmbt buffer go back through the verifiers later so that
+ * we correct checksum errors stemming from bitflips in the unused
+ * parts of the bmbt block.
+ */
+ if (bp->b_error == -EFSBADCRC)
+ bp->b_flags |= LIBXFS_B_UNCHECKED;
+
rc = (*func)(XFS_BUF_TO_BLOCK(bp), level - 1, isadir, args);

libxfs_putbuf(bp);