This is a note to let you know that I've just added the patch titled nvme-multipath: set bdi capabilities once to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: nvme-multipath-set-bdi-capabilities-once.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 865046a12fee7b8875fe5d197fca9ec9e2456ae0 Author: Keith Busch <kbusch@xxxxxxxxxx> Date: Thu Apr 9 09:09:04 2020 -0700 nvme-multipath: set bdi capabilities once [ Upstream commit b2ce4d90690bd29ce5b554e203cd03682dd59697 ] The queues' backing device info capabilities don't change with each namespace revalidation. Set it only when each path's request_queue is initially added to a multipath queue. Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx> Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx> Signed-off-by: Christoph Hellwig <hch@xxxxxx> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 772eb05e57afe..7cc0ec180d555 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -3,6 +3,7 @@ * Copyright (c) 2017-2018 Christoph Hellwig. */ +#include <linux/backing-dev.h> #include <linux/moduleparam.h> #include <trace/events/block.h> #include "nvme.h" @@ -662,6 +663,13 @@ void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id) ns->ana_state = NVME_ANA_OPTIMIZED; nvme_mpath_set_live(ns); } + + 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; + } } void nvme_mpath_remove_disk(struct nvme_ns_head *head)