[PATCH] md: add error reporting to superblock write failure

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 40cb79ac4039..38a0a5741d52 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -389,8 +389,12 @@ static int super_written(struct bio *bio, unsigned int bytes_done, int error)
         if (bio->bi_size)
                 return 1;
 
-        if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
+        if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
+                printk("md: super_written gets error=%d, uptodate=%d\n",
+                       error, test_bit(BIO_UPTODATE, &bio->bi_flags));
+                WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
                 md_error(mddev, rdev);
+        }
 
         if (atomic_dec_and_test(&mddev->pending_writes))
                 wake_up(&mddev->sb_wait);