1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index a1f2ab553b9..96feada5e76 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -2171,6 +2171,21 @@ static int origin_status(struct dm_target *ti, status_type_t type, char *result,
         return 0;
 }
 
+static int origin_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
+                        struct bio_vec *biovec, int max_size)
+{
+        struct dm_dev *dev = ti->private;
+        struct request_queue *q = bdev_get_queue(dev->bdev);
+
+        if (!q->merge_bvec_fn)
+                return max_size;
+
+        bvm->bi_bdev = dev->bdev;
+        bvm->bi_sector = bvm->bi_sector;
+
+        return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
+}
+
 static int origin_iterate_devices(struct dm_target *ti,
                                   iterate_devices_callout_fn fn, void *data)
 {
@@ -2188,6 +2203,7 @@ static struct target_type origin_target = {
         .map     = origin_map,
         .resume  = origin_resume,
         .status  = origin_status,
+        .merge   = origin_merge,
         .iterate_devices = origin_iterate_devices,
 };