[PATCH 3.16.y-ckt 025/216] drbd: merge_bvec_fn: properly remap bvm->bi_bdev

Luis Henriques
2015-01-12T19:13:33Z

From: Lars Ellenberg <lars.ellenberg@linbit.com>

commit 3b9d35d744bb5139f9fed57f38c019bb8c7d351c upstream.

This was not noticed for many years. Affects operation if
md raid is used a backing device for DRBD.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
drivers/block/drbd/drbd_req.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 09803d0d5207..eeba503ee7bb 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -1343,6 +1343,7 @@ int drbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bvm, struct
struct request_queue * const b =
device->ldev->backing_bdev->bd_disk->queue;
if (b->merge_bvec_fn) {
+ bvm->bi_bdev = device->ldev->backing_bdev;
backing_limit = b->merge_bvec_fn(b, bvm, bvec);
limit = min(limit, backing_limit);
}
--
2.1.4