linux-kernel - [PATCH 5.2 002/143] nvme-multipath: revalidate nvme_ns_head gendisk in nvme_validate

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Message-Id: <20190904175314.293360423@linuxfoundation.org>
Date:   Wed,  4 Sep 2019 19:52:25 +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, Anthony Iliopoulos <ailiopoulos@...e.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Christoph Hellwig <hch@....de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.2 002/143] nvme-multipath: revalidate nvme_ns_head gendisk in nvme_validate_ns

[ Upstream commit fab7772bfbcfe8fb8e3e352a6a8fcaf044cded17 ]

When CONFIG_NVME_MULTIPATH is set, only the hidden gendisk associated
with the per-controller ns is run through revalidate_disk when a
rescan is triggered, while the visible blockdev never gets its size
(bdev->bd_inode->i_size) updated to reflect any capacity changes that
may have occurred.

This prevents online resizing of nvme block devices and in extension of
any filesystems atop that will are unable to expand while mounted, as
userspace relies on the blockdev size for obtaining the disk capacity
(via BLKGETSIZE/64 ioctls).

Fix this by explicitly revalidating the actual namespace gendisk in
addition to the per-controller gendisk, when multipath is enabled.

Signed-off-by: Anthony Iliopoulos <ailiopoulos@...e.com>
Reviewed-by: Sagi Grimberg <sagi@...mberg.me>
Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 5deb4deb38209..ab1a2b1ec3637 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1668,6 +1668,7 @@ 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);
+		revalidate_disk(ns->head->disk);
 	}
 #endif
 }
-- 
2.20.1