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[dm-devel] [PATCH v2 15/17] dm snapshot: make exceptions if merge is dispatching to origin

From: Mikulas Patocka <mpatocka redhat com>

If write request to merging snapshot device is to be dispatched
directly to the origin (because the chunk is not remapped or was
already merged), we must make exceptions in other snapshots.

Signed-off-by: Mikulas Patocka <mpatocka redhat com>
Reviewed-by: Mike Snitzer <snitzer redhat com>
 drivers/md/dm-snap.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 7f0d261..f67bfff 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -1529,6 +1529,11 @@ 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);
+	}

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