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authorArne Redlich <agr@powerkom-dd.de>2007-07-31 00:37:57 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2007-08-09 14:27:36 -0700
commit1eb34652551146be64def511d34a02178d9b00cd (patch)
tree9f832411841de0906c3f8853963a28e3f737e7fd
parent68a0460bbcc7571753b57b83f21e8c1c5029a46a (diff)
downloadlwn-1eb34652551146be64def511d34a02178d9b00cd.tar.gz
lwn-1eb34652551146be64def511d34a02178d9b00cd.zip
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> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/md/raid10.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 9eb66c1b523b..fb5d9c6e9de0 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -917,6 +917,13 @@ static int make_request(request_queue_t *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);