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From: Mike Snitzer <snitzer@redhat.com>
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Date: Mon,  5 Oct 2009 15:02:45 -0400
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Cc: Mikulas Patocka <mpatocka@redhat.com>
Subject: [dm-devel] [PATCH 10/12]
	dm-snapshot-merge-make-exceptions-in-other-snapshots-if-remapped-to-origin
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diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 3be57ba..8060fe3 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -1488,6 +1488,11 @@ static int snapshot_merge_map(struct dm_target *ti, struct bio *bio,
 
 	bio->bi_bdev = s->origin->bdev;
 
+	if (bio_rw(bio) == WRITE) {
+		up_write(&s->lock);
+		return do_origin(s->origin, bio);
+	}
+
  out_unlock:
 	up_write(&s->lock);