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drbd: merge_bvec_fn: properly remap bvm->bi_bdev 

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

CC: stable@kernel.org # v3.2+
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>
This commit is contained in:
Lars Ellenberg 2014-11-10 17:21:13 +01:00 committed by Jens Axboe
parent ff8bd88b73
commit 3b9d35d744
1 changed files with 1 additions and 0 deletions
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drivers/block/drbd/drbd_req.c
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@ -1545,6 +1545,7 @@ 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);
}