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nvmet: preserve controller serial number between reboots

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The NVMe target has no way to preserve controller serial
IDs across reboots which breaks udev scripts doing
SYMLINK+="dev/disk/by-id/nvme-$env{ID_SERIAL}-part%n.

Export the randomly generated serial number via configfs and allow
setting of a serial via configfs to mitigate this breakage.

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>
This commit is contained in:
Johannes Thumshirn 2017-07-14 15:36:56 +02:00 committed by Jens Axboe
parent 2e7f5d2af2
commit fcbc545959
1 changed files with 22 additions and 0 deletions
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22
drivers/nvme/target/configfs.c
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@ -686,9 +686,31 @@ static ssize_t nvmet_subsys_attr_version_store(struct config_item *item,
}
CONFIGFS_ATTR(nvmet_subsys_, attr_version);
static ssize_t nvmet_subsys_attr_serial_show(struct config_item *item,
char *page)
{
struct nvmet_subsys *subsys = to_subsys(item);
return snprintf(page, PAGE_SIZE, "%llx\n", subsys->serial);
}
static ssize_t nvmet_subsys_attr_serial_store(struct config_item *item,
const char *page, size_t count)
{
struct nvmet_subsys *subsys = to_subsys(item);
down_write(&nvmet_config_sem);
sscanf(page, "%llx\n", &subsys->serial);
up_write(&nvmet_config_sem);
return count;
}
CONFIGFS_ATTR(nvmet_subsys_, attr_serial);
static struct configfs_attribute *nvmet_subsys_attrs[] = {
&nvmet_subsys_attr_attr_allow_any_host,
&nvmet_subsys_attr_attr_version,
&nvmet_subsys_attr_attr_serial,
NULL,
};