The patch below does not apply to the 3.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 3b9d35d744bb5139f9fed57f38c019bb8c7d351c Mon Sep 17 00:00:00 2001
From: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx>
Date: Mon, 10 Nov 2014 17:21:13 +0100
Subject: [PATCH] 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@xxxxxxxxxx # v3.2+
Signed-off-by: Philipp Reisner <philipp.reisner@xxxxxxxxxx>
Signed-off-by: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxx>
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 5a01c53dddeb..90319b14d5ee 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -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);
}
--
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