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nvme: fix block device naming collision

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The issue exists when multipath is enabled and the namespace is
shared, but all the other controller checks at nvme_is_unique_nsid()
are false. The reason for this issue is that nvme_is_unique_nsid()
returns false when is called from nvme_mpath_alloc_disk() due to an
uninitialized value of head->shared. The patch fixes it by setting
head->shared before nvme_mpath_alloc_disk() is called.

Fixes: 5974ea7ce0 ("nvme: allow duplicate NSIDs for private namespaces")
Signed-off-by: Israel Rukshin <israelr@nvidia.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Israel Rukshin 2022-07-14 12:42:10 +00:00 committed by Christoph Hellwig
parent 081f5e753c
commit 6961b5e028
1 changed files with 3 additions and 3 deletions
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6
drivers/nvme/host/core.c
View file

@ -3786,7 +3786,7 @@ static int nvme_add_ns_cdev(struct nvme_ns *ns)
}
static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl,
unsigned nsid, struct nvme_ns_ids *ids)
unsigned nsid, struct nvme_ns_ids *ids, bool is_shared)
{
struct nvme_ns_head *head;
size_t size = sizeof(*head);
@ -3810,6 +3810,7 @@ static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl,
head->subsys = ctrl->subsys;
head->ns_id = nsid;
head->ids = *ids;
head->shared = is_shared;
kref_init(&head->ref);
if (head->ids.csi) {
@ -3891,12 +3892,11 @@ static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
nsid);
goto out_unlock;
}
head = nvme_alloc_ns_head(ctrl, nsid, ids);
head = nvme_alloc_ns_head(ctrl, nsid, ids, is_shared);
if (IS_ERR(head)) {
ret = PTR_ERR(head);
goto out_unlock;
}
head->shared = is_shared;
} else {
ret = -EINVAL;
if (!is_shared || !head->shared) {