linux-kernel - [PATCH 4.19 099/276] nvme: set 0 capacity if namespace block size exceeds PAGE

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Message-Id: <20190530030532.308764459@linuxfoundation.org>
Date:   Wed, 29 May 2019 20:04:17 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <keith.busch@...el.com>,
        Christoph Hellwig <hch@....de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 099/276] nvme: set 0 capacity if namespace block size exceeds PAGE_SIZE

[ Upstream commit 01fa017484ad98fccdeaab32db0077c574b6bd6f ]

If our target exposed a namespace with a block size that is greater
than PAGE_SIZE, set 0 capacity on the namespace as we do not support it.

This issue encountered when the nvmet namespace was backed by a tempfile.

Signed-off-by: Sagi Grimberg <sagi@...mberg.me>
Reviewed-by: Keith Busch <keith.busch@...el.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 2cdb3032ca0fc..abfb46378cc13 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1480,6 +1480,10 @@ static void nvme_update_disk_info(struct gendisk *disk,
 	sector_t capacity = le64_to_cpup(&id->nsze) << (ns->lba_shift - 9);
 	unsigned short bs = 1 << ns->lba_shift;
 
+	if (ns->lba_shift > PAGE_SHIFT) {
+		/* unsupported block size, set capacity to 0 later */
+		bs = (1 << 9);
+	}
 	blk_mq_freeze_queue(disk->queue);
 	blk_integrity_unregister(disk);
 
@@ -1490,7 +1494,8 @@ static void nvme_update_disk_info(struct gendisk *disk,
 	if (ns->ms && !ns->ext &&
 	    (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED))
 		nvme_init_integrity(disk, ns->ms, ns->pi_type);
-	if (ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk))
+	if ((ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk)) ||
+	    ns->lba_shift > PAGE_SHIFT)
 		capacity = 0;
 
 	set_capacity(disk, capacity);
-- 
2.20.1