linux-kernel - [PATCH 5.7 034/112] nvme-multipath: set bdi capabilities once

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Date:   Tue,  7 Jul 2020 17:16:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Keith Busch <kbusch@...nel.org>,
        Sagi Grimberg <sagi@...mberg.me>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 034/112] nvme-multipath: set bdi capabilities once

From: Keith Busch <kbusch@...nel.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@...nel.org>
Reviewed-by: Sagi Grimberg <sagi@...mberg.me>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/core.c      | 7 -------
 drivers/nvme/host/multipath.c | 8 ++++++++
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 7b4cbe2c69541..887139f8fa53b 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1910,13 +1910,6 @@ 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
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 17f172cf456ad..91a8b1ce5a3a2 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)
-- 
2.25.1