linux-kernel - [PATCH 5.4 104/178] nvme-multipath: set bdi capabilities once

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Message-Id: <20200629152523.2494198-105-sashal@kernel.org>
Date:   Mon, 29 Jun 2020 11:24:09 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     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 5.4 104/178] 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/multipath.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 56caddeabb5e5..c17cf8f00f536 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"
@@ -666,6 +667,13 @@ 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