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nvmet: make ver stable once connection established 

Once some host has connected to the nvmf target, make sure that the
version number is stable and cannot be changed.

Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Noam Gottlieb <ngottlieb@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Noam Gottlieb 2021-06-07 12:23:24 +03:00 committed by Christoph Hellwig
parent 0d148efdf0
commit 87fd4cc1c0
1 changed files with 31 additions and 5 deletions
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36
drivers/nvme/target/configfs.c
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@ -1007,13 +1007,26 @@ static ssize_t nvmet_subsys_attr_version_show(struct config_item *item,
NVME_MINOR(subsys->ver));
}
static ssize_t nvmet_subsys_attr_version_store(struct config_item *item,
const char *page, size_t count)
static ssize_t
nvmet_subsys_attr_version_store_locked(struct nvmet_subsys *subsys,
const char *page, size_t count)
{
struct nvmet_subsys *subsys = to_subsys(item);
int major, minor, tertiary = 0;
int ret;
if (subsys->subsys_discovered) {
if (NVME_TERTIARY(subsys->ver))
pr_err("Can't set version number. %llu.%llu.%llu is already assigned\n",
NVME_MAJOR(subsys->ver),
NVME_MINOR(subsys->ver),
NVME_TERTIARY(subsys->ver));
else
pr_err("Can't set version number. %llu.%llu is already assigned\n",
NVME_MAJOR(subsys->ver),
NVME_MINOR(subsys->ver));
return -EINVAL;
}
/* passthru subsystems use the underlying controller's version */
if (nvmet_passthru_ctrl(subsys))
return -EINVAL;
@ -1022,12 +1035,25 @@ static ssize_t nvmet_subsys_attr_version_store(struct config_item *item,
if (ret != 2 && ret != 3)
return -EINVAL;
down_write(&nvmet_config_sem);
subsys->ver = NVME_VS(major, minor, tertiary);
up_write(&nvmet_config_sem);
return count;
}
static ssize_t nvmet_subsys_attr_version_store(struct config_item *item,
const char *page, size_t count)
{
struct nvmet_subsys *subsys = to_subsys(item);
ssize_t ret;
down_write(&nvmet_config_sem);
mutex_lock(&subsys->lock);
ret = nvmet_subsys_attr_version_store_locked(subsys, page, count);
mutex_unlock(&subsys->lock);
up_write(&nvmet_config_sem);
return ret;
}
CONFIGFS_ATTR(nvmet_subsys_, attr_version);
/* See Section 1.5 of NVMe 1.4 */