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nvmet: fix nvme status code when namespace is disabled

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If the user disabled a nvmet namespace, it is removed from the subsystem
namespaces list. When nvmet processes a command directed to an nsid that
was disabled, it cannot differentiate between a nsid that is disabled
vs. a non-existent namespace, and resorts to return NVME_SC_INVALID_NS
with the dnr bit set.

This translates to a non-retryable status for the host, which translates
to a user error. We should expect disabled namespaces to not cause an
I/O error in a multipath environment.

Address this by searching a configfs item for the namespace nvmet failed
to find, and if we found one, conclude that the namespace is disabled
(perhaps temporarily). Return NVME_SC_INTERNAL_PATH_ERROR in this case
and keep DNR bit cleared.

Reported-by: Jirong Feng <jirong.feng@easystack.cn>
Tested-by: Jirong Feng <jirong.feng@easystack.cn>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Sagi Grimberg 2024-04-28 12:25:40 +03:00 committed by Keith Busch
parent 6825bdde44
commit 505363957f
3 changed files with 18 additions and 1 deletions
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13
drivers/nvme/target/configfs.c
View File

@ -754,6 +754,19 @@ static struct configfs_attribute *nvmet_ns_attrs[] = {
NULL,
};
bool nvmet_subsys_nsid_exists(struct nvmet_subsys *subsys, u32 nsid)
{
struct config_item *ns_item;
char name[4] = {};
if (sprintf(name, "%u", nsid) <= 0)
return false;
mutex_lock(&subsys->namespaces_group.cg_subsys->su_mutex);
ns_item = config_group_find_item(&subsys->namespaces_group, name);
mutex_unlock(&subsys->namespaces_group.cg_subsys->su_mutex);
return ns_item != NULL;
}
static void nvmet_ns_release(struct config_item *item)
{
struct nvmet_ns *ns = to_nvmet_ns(item);

5
drivers/nvme/target/core.c
View File

@ -437,10 +437,13 @@ void nvmet_stop_keep_alive_timer(struct nvmet_ctrl *ctrl)
u16 nvmet_req_find_ns(struct nvmet_req *req)
{
u32 nsid = le32_to_cpu(req->cmd->common.nsid);
struct nvmet_subsys *subsys = nvmet_req_subsys(req);
req->ns = xa_load(&nvmet_req_subsys(req)->namespaces, nsid);
req->ns = xa_load(&subsys->namespaces, nsid);
if (unlikely(!req->ns)) {
req->error_loc = offsetof(struct nvme_common_command, nsid);
if (nvmet_subsys_nsid_exists(subsys, nsid))
return NVME_SC_INTERNAL_PATH_ERROR;
return NVME_SC_INVALID_NS | NVME_SC_DNR;
}

1
drivers/nvme/target/nvmet.h
View File

@ -543,6 +543,7 @@ void nvmet_subsys_disc_changed(struct nvmet_subsys *subsys,
struct nvmet_host *host);
void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
u8 event_info, u8 log_page);
bool nvmet_subsys_nsid_exists(struct nvmet_subsys *subsys, u32 nsid);
#define NVMET_MIN_QUEUE_SIZE 16
#define NVMET_MAX_QUEUE_SIZE 1024