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authorNoam Gottlieb <ngottlieb@nvidia.com>2021-06-07 12:23:23 +0300
committerChristoph Hellwig <hch@lst.de>2021-06-17 15:51:19 +0200
commit0d148efdf0f0414b2ed2dd9c31e71302bb9ce123 (patch)
treec19cc225b6fe04596e893ca110cff17fde959c88
parent7ae023c5aa644211bde26db11018fe08b8408bd5 (diff)
nvmet: allow mn change if subsys not discovered
Currently, once the subsystem's model_number is set for the first time there is no way to change it. However, as long as no connection was established to nvmf target, there is no reason for such restriction and we should allow to change the subsystem's model_number as many times as needed. In addition, in order to simplfy the changes and make the model number flow more similar to the rest of the attributes in the Identify Controller data structure, we set a default value for the model number at the initiation of the subsystem. Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com> Signed-off-by: Noam Gottlieb <ngottlieb@nvidia.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
-rw-r--r--drivers/nvme/target/admin-cmd.c26
-rw-r--r--drivers/nvme/target/configfs.c10
-rw-r--r--drivers/nvme/target/core.c21
-rw-r--r--drivers/nvme/target/discovery.c4
4 files changed, 21 insertions, 40 deletions
diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 5f15c3285a5b..cd60a8184d04 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -313,22 +313,6 @@ static void nvmet_execute_get_log_page(struct nvmet_req *req)
nvmet_req_complete(req, NVME_SC_INVALID_FIELD | NVME_SC_DNR);
}
-static u16 nvmet_set_model_number(struct nvmet_subsys *subsys)
-{
- u16 status = 0;
-
- mutex_lock(&subsys->lock);
- if (!subsys->model_number) {
- subsys->model_number =
- kstrdup(NVMET_DEFAULT_CTRL_MODEL, GFP_KERNEL);
- if (!subsys->model_number)
- status = NVME_SC_INTERNAL;
- }
- mutex_unlock(&subsys->lock);
-
- return status;
-}
-
static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
@@ -343,16 +327,6 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
mutex_unlock(&subsys->lock);
}
- /*
- * If there is no model number yet, set it now. It will then remain
- * stable for the life time of the subsystem.
- */
- if (!subsys->model_number) {
- status = nvmet_set_model_number(subsys);
- if (status)
- goto out;
- }
-
id = kzalloc(sizeof(*id), GFP_KERNEL);
if (!id) {
status = NVME_SC_INTERNAL;
diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index a13da86fb374..9ef8708b92c6 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -1154,14 +1154,8 @@ static ssize_t nvmet_subsys_attr_model_show(struct config_item *item,
char *page)
{
struct nvmet_subsys *subsys = to_subsys(item);
- int ret;
-
- mutex_lock(&subsys->lock);
- ret = snprintf(page, PAGE_SIZE, "%s\n", subsys->model_number ?
- subsys->model_number : NVMET_DEFAULT_CTRL_MODEL);
- mutex_unlock(&subsys->lock);
- return ret;
+ return snprintf(page, PAGE_SIZE, "%s\n", subsys->model_number);
}
static ssize_t nvmet_subsys_attr_model_store_locked(struct nvmet_subsys *subsys,
@@ -1169,7 +1163,7 @@ static ssize_t nvmet_subsys_attr_model_store_locked(struct nvmet_subsys *subsys,
{
int pos = 0, len;
- if (subsys->model_number) {
+ if (subsys->subsys_discovered) {
pr_err("Can't set model number. %s is already assigned\n",
subsys->model_number);
return -EINVAL;
diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index 213a0c2af4f7..146909486b8f 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -1494,6 +1494,7 @@ struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
{
struct nvmet_subsys *subsys;
char serial[NVMET_SN_MAX_SIZE / 2];
+ int ret;
subsys = kzalloc(sizeof(*subsys), GFP_KERNEL);
if (!subsys)
@@ -1504,6 +1505,12 @@ struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
get_random_bytes(&serial, sizeof(serial));
bin2hex(subsys->serial, &serial, sizeof(serial));
+ subsys->model_number = kstrdup(NVMET_DEFAULT_CTRL_MODEL, GFP_KERNEL);
+ if (!subsys->model_number) {
+ ret = -ENOMEM;
+ goto free_subsys;
+ }
+
switch (type) {
case NVME_NQN_NVME:
subsys->max_qid = NVMET_NR_QUEUES;
@@ -1513,15 +1520,15 @@ struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
break;
default:
pr_err("%s: Unknown Subsystem type - %d\n", __func__, type);
- kfree(subsys);
- return ERR_PTR(-EINVAL);
+ ret = -EINVAL;
+ goto free_mn;
}
subsys->type = type;
subsys->subsysnqn = kstrndup(subsysnqn, NVMF_NQN_SIZE,
GFP_KERNEL);
if (!subsys->subsysnqn) {
- kfree(subsys);
- return ERR_PTR(-ENOMEM);
+ ret = -ENOMEM;
+ goto free_mn;
}
subsys->cntlid_min = NVME_CNTLID_MIN;
subsys->cntlid_max = NVME_CNTLID_MAX;
@@ -1533,6 +1540,12 @@ struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
INIT_LIST_HEAD(&subsys->hosts);
return subsys;
+
+free_mn:
+ kfree(subsys->model_number);
+free_subsys:
+ kfree(subsys);
+ return ERR_PTR(ret);
}
static void nvmet_subsys_free(struct kref *ref)
diff --git a/drivers/nvme/target/discovery.c b/drivers/nvme/target/discovery.c
index b7fdad13094a..7aa62bc6ae84 100644
--- a/drivers/nvme/target/discovery.c
+++ b/drivers/nvme/target/discovery.c
@@ -244,7 +244,6 @@ static void nvmet_execute_disc_identify(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
struct nvme_id_ctrl *id;
- const char model[] = "Linux";
u16 status = 0;
if (!nvmet_check_transfer_len(req, NVME_IDENTIFY_DATA_SIZE))
@@ -264,7 +263,8 @@ static void nvmet_execute_disc_identify(struct nvmet_req *req)
memcpy(id->sn, ctrl->subsys->serial, NVMET_SN_MAX_SIZE);
memset(id->fr, ' ', sizeof(id->fr));
- memcpy_and_pad(id->mn, sizeof(id->mn), model, sizeof(model) - 1, ' ');
+ memcpy_and_pad(id->mn, sizeof(id->mn), ctrl->subsys->model_number,
+ strlen(ctrl->subsys->model_number), ' ');
memcpy_and_pad(id->fr, sizeof(id->fr),
UTS_RELEASE, strlen(UTS_RELEASE), ' ');