[PATCHv2] nvmet: implement unique discovery NQN

[Christoph Hellwig]

On Fri, Dec 15, 2023 at 01:39:29PM +0100, hare at kernel.org wrote:
> From: Hannes Reinecke <hare at suse.de>
> 
> Add a configfs attribute 'discovery_nqn' in the 'nvmet' configfs
> directory to specify the unique discovery NQN.

That's a bit of a sparse commit log.  What do  unique discovery NQN do?
Please include a reference and a bit of an explnation.  And tell us
why this feature is useful for Linux to have.