[PATCH] xfs: don't verify buffers after IO errors

[Dave Chinner]

From: Dave Chinner <dchinner at redhat.com>

When we read a buffer, we might get an error from the underlying
block device and not the real data. Hence if we get an IO error, we
shouldn't run the verifier but instead just pass the IO error
straight through.

Signed-off-by: Dave Chinner <dchinner at redhat.com>
---
 fs/xfs/xfs_buf.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 4e8f0df..50eb603 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -1022,7 +1022,9 @@ xfs_buf_iodone_work(
 	bool			read = !!(bp->b_flags & XBF_READ);
 
 	bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_READ_AHEAD);
-	if (read && bp->b_ops)
+
+	/* only validate buffers that were read without errors */
+	if (read && bp->b_ops && !bp->b_error && (bp->b_flags & XBF_DONE))
 		bp->b_ops->verify_read(bp);
 
 	if (bp->b_iodone)
-- 
1.7.10