nvmet: Move serial number from controller to subsystem

The NVMe specification defines the serial number as:

"Serial Number (SN): Contains the serial number for the NVM subsystem
that is assigned by the vendor as an ASCII string. Refer to section
7.10 for unique identifier requirements. Refer to section 1.5 for ASCII
string requirements"

So move it from the controller to the subsystem, where it belongs.

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 35f930d..f7ba006 100644 (file)
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -185,7 +185,7 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
        id->ssvid = 0;
 
        memset(id->sn, ' ', sizeof(id->sn));
-       snprintf(id->sn, sizeof(id->sn), "%llx", ctrl->serial);
+       snprintf(id->sn, sizeof(id->sn), "%llx", ctrl->subsys->serial);
 
        memset(id->mn, ' ', sizeof(id->mn));
        strncpy((char *)id->mn, "Linux", sizeof(id->mn));

diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index b5b4ac1..f4b02bb 100644 (file)
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -767,9 +767,6 @@ u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
        memcpy(ctrl->subsysnqn, subsysnqn, NVMF_NQN_SIZE);
        memcpy(ctrl->hostnqn, hostnqn, NVMF_NQN_SIZE);
 
-       /* generate a random serial number as our controllers are ephemeral: */
-       get_random_bytes(&ctrl->serial, sizeof(ctrl->serial));
-
        kref_init(&ctrl->ref);
        ctrl->subsys = subsys;
 
@@ -928,6 +925,8 @@ struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
                return NULL;
 
        subsys->ver = NVME_VS(1, 3, 0); /* NVMe 1.3.0 */
+       /* generate a random serial number as our controllers are ephemeral: */
+       get_random_bytes(&subsys->serial, sizeof(subsys->serial));
 
        switch (type) {
        case NVME_NQN_NVME:

diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 747bbdb..e3b244c 100644 (file)
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -112,7 +112,6 @@ struct nvmet_ctrl {
 
        struct mutex            lock;
        u64                     cap;
-       u64                     serial;
        u32                     cc;
        u32                     csts;
 
@@ -152,6 +151,7 @@ struct nvmet_subsys {
        u16                     max_qid;
 
        u64                     ver;
+       u64                     serial;
        char                    *subsysnqn;
 
        struct config_group     group;