From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Philipp Reisner , Lars Ellenberg , Jens Axboe Subject: [PATCH 3.18 091/150] drbd: merge_bvec_fn: properly remap bvm->bi_bdev Date: Tue, 13 Jan 2015 23:22:42 -0800 Message-Id: <20150114072059.996883185@linuxfoundation.org> In-Reply-To: <20150114072055.842408181@linuxfoundation.org> References: <20150114072055.842408181@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Lars Ellenberg 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 Signed-off-by: Lars Ellenberg Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- drivers/block/drbd/drbd_req.c | 1 + 1 file changed, 1 insertion(+) --- 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 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); }