Commit f6f953aa authored Jul 31, 2007 by Arne Redlich Committed by Linus Torvalds Jul 31, 2007

md: handle writes to broken raid10 arrays gracefully



When writing to a broken array, raid10 currently happily emits empty bio
lists.  IOW, the master bio will never be completed, sending writers to
UNINTERRUPTIBLE_SLEEP forever.

Signed-off-by: Arne Redlich <agr@powerkom-dd.de>
Acked-by: Neil Brown <neilb@suse.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 14e71344

drivers/md/raid10.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -917,6 +917,13 @@ static int make_request(struct request_queue q, struct bio bio)
		bio_list_add(&bl, mbio);
		}

		if (unlikely(!atomic_read(&r10_bio->remaining))) {
		/* the array is dead */
		md_write_end(mddev);
		raid_end_bio_io(r10_bio);
		return 0;
		}

		bitmap_startwrite(mddev->bitmap, bio->bi_sector, r10_bio->sectors, 0);
		spin_lock_irqsave(&conf->device_lock, flags);
		bio_list_merge(&conf->pending_bio_list, &bl);