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md: handle writes to broken raid10 arrays gracefully

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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>
This commit is contained in:
Arne Redlich 2007-07-31 00:37:57 -07:00 committed by Linus Torvalds
parent 14e713446a
commit f6f953aa99
1 changed files with 7 additions and 0 deletions
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7
drivers/md/raid10.c
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@ -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);