[PATCH 4.19 09/36] nvme-multipath: set bdi capabilities once

Greg Kroah-Hartman
2020-07-07T15:34:24Z

From: Keith Busch <kbusch@kernel.org>

[ 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@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/nvme/host/multipath.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 588864beabd80..6f584a9515f42 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -11,6 +11,7 @@
* more details.
*/

+#include <linux/backing-dev.h>
#include <linux/moduleparam.h>
#include <trace/events/block.h>
#include "nvme.h"
@@ -521,6 +522,13 @@ void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id)
nvme_mpath_set_live(ns);
mutex_unlock(&ns->head->lock);
}
+
+ 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)
--
2.25.1