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 <redacted>
---
 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);

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