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nvmet: make discovery NQN configurable

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TPAR8013 allows for unique discovery NQNs, so make the discovery
controller NQN configurable by exposing a subsys attribute
'discovery_nqn'.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Hannes Reinecke 2021-09-22 08:35:19 +02:00 committed by Christoph Hellwig
parent c7d792f9b8
commit 626851e922
2 changed files with 41 additions and 1 deletions
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39
drivers/nvme/target/configfs.c
View File

@ -1233,6 +1233,44 @@ static ssize_t nvmet_subsys_attr_model_store(struct config_item *item,
}
CONFIGFS_ATTR(nvmet_subsys_, attr_model);
static ssize_t nvmet_subsys_attr_discovery_nqn_show(struct config_item *item,
char *page)
{
return snprintf(page, PAGE_SIZE, "%s\n",
nvmet_disc_subsys->subsysnqn);
}
static ssize_t nvmet_subsys_attr_discovery_nqn_store(struct config_item *item,
const char *page, size_t count)
{
struct nvmet_subsys *subsys = to_subsys(item);
char *subsysnqn;
int len;
len = strcspn(page, "\n");
if (!len)
return -EINVAL;
subsysnqn = kmemdup_nul(page, len, GFP_KERNEL);
if (!subsysnqn)
return -ENOMEM;
/*
* The discovery NQN must be different from subsystem NQN.
*/
if (!strcmp(subsysnqn, subsys->subsysnqn)) {
kfree(subsysnqn);
return -EBUSY;
}
down_write(&nvmet_config_sem);
kfree(nvmet_disc_subsys->subsysnqn);
nvmet_disc_subsys->subsysnqn = subsysnqn;
up_write(&nvmet_config_sem);
return count;
}
CONFIGFS_ATTR(nvmet_subsys_, attr_discovery_nqn);
#ifdef CONFIG_BLK_DEV_INTEGRITY
static ssize_t nvmet_subsys_attr_pi_enable_show(struct config_item *item,
char *page)
@ -1262,6 +1300,7 @@ static struct configfs_attribute *nvmet_subsys_attrs[] = {
&nvmet_subsys_attr_attr_cntlid_min,
&nvmet_subsys_attr_attr_cntlid_max,
&nvmet_subsys_attr_attr_model,
&nvmet_subsys_attr_attr_discovery_nqn,
#ifdef CONFIG_BLK_DEV_INTEGRITY
&nvmet_subsys_attr_attr_pi_enable,
#endif

3
drivers/nvme/target/core.c
View File

@ -1493,7 +1493,8 @@ static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port,
if (!port)
return NULL;
if (!strcmp(NVME_DISC_SUBSYS_NAME, subsysnqn)) {
if (!strcmp(NVME_DISC_SUBSYS_NAME, subsysnqn) ||
!strcmp(nvmet_disc_subsys->subsysnqn, subsysnqn)) {
if (!kref_get_unless_zero(&nvmet_disc_subsys->ref))
return NULL;
return nvmet_disc_subsys;