[PATCH] nvmet: preserve controller serial number between reboots

[Martin Wilck]

On Thu, 2017-07-13 at 12:48 +0200, Johannes Thumshirn wrote:
> 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.

I'm wondering if this should be a write-once attribute. Also,
Once the serial number has been passed on to some host (or maybe only:
while the device is in use by some host), the attribute should probably
be read-only.

Martin