[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>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 40cb79a..38a0a57 100644 (file)
--- 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);