[PATCH 05/10] xfs_repair: force not-so-bad bmbt blocks back through the verifier

["Darrick J. Wong" <djwong@xxxxxxxxxxxxxxxx>]

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@xxxxxxxxxx>
---
 repair/prefetch.c |    8 ++++++++
 1 file changed, 8 insertions(+)


diff --git a/repair/prefetch.c b/repair/prefetch.c
index 8b261ae..fc7097f 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_error == -EFSCORRUPTED)
+               bp->b_flags |= LIBXFS_B_UNCHECKED;
+
        rc = (*func)(XFS_BUF_TO_BLOCK(bp), level - 1, isadir, args);
 
        libxfs_putbuf(bp);