[RFC PATCH 0/3] nvmet: export discovery subsystem

[Hannes Reinecke <hare@suse.de>]

Hi all,

here's a patchset to expose the discovery subsystem in configfs.
The current implementation is has a rather 'odd' discovery subsystem
implementation; there is one discovery subsystem structure, but the
details of this subsystem will be modified depending from which port
(and, consequently, port->subsystem link) is has been called.
This makes is really awkward to assign unique properties to it
(like the unique discovery NQN).

With this patchset the discovery subsystem is elevated to a 'real'
subsystem, with a normal subsystem entry in sysfs and with activation
of it by linking this subsystem to ports.
This gives full control to the user which subsystem should be visible
on this discovery controller, and also allows to have a discovery
controller with no I/O subsystems at all.

Drawback is that it's a change in operation, as the user _has_ to
link the subsystem to individual ports.

As usual, comments and reviews are welcome.

Hannes Reinecke (3):
  nvmet: expose discovery subsystem in sysfs
  nvmet: restrict setting of discovery_nqn to discovery subsystem
  nvmet: do not allow to create a subsystem with the discovery NQN

 drivers/nvme/target/configfs.c  | 46 +++++++++++++++++++++++++++++----
 drivers/nvme/target/core.c      |  1 +
 drivers/nvme/target/discovery.c |  7 +----
 3 files changed, 43 insertions(+), 11 deletions(-)

-- 
2.29.2