From: Sagi Grimberg <sagi@grimberg.me>

Date: Wed, 1 Apr 2020 22:44:43 -0700

Subject: [PATCH] nvme: inherit stable pages constraint in the mpath stack

Git-commit: 74e4d20e2f43cf09a35543d960ac8f7a1ffcbbb5

Patch-mainline: v5.7-rc1

References: bsc#1169045

 device

If the backing device require stable pages, we need to set it on the

stack mpath device as well. This applies to rdma/fc transports when

doing data integrity and tcp transport calculating digests.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>

Signed-off-by: Christoph Hellwig <hch@lst.de>

Acked-by: Hannes Reinecke <hare@suse.com>

---

 drivers/nvme/host/core.c | 7 +++++++

 1 file changed, 7 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c

index 2db8563aeb2d..91c1bd659947 100644

--- a/drivers/nvme/host/core.c

+++ b/drivers/nvme/host/core.c

@@ -1897,6 +1897,13 @@ static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)

 	if (ns->head->disk) {

 		nvme_update_disk_info(ns->head->disk, ns, id);

 		blk_queue_stack_limits(ns->head->disk->queue, ns->queue);

+		if (bdi_cap_stable_pages_required(ns->queue->backing_dev_info)) {

+			struct backing_dev_info *info =

+				ns->head->disk->queue->backing_dev_info;

+

+                        info->capabilities |= BDI_CAP_STABLE_WRITES;

+		}

+

 		revalidate_disk(ns->head->disk);

 	}

 #endif

-- 

2.16.4