nvme: provide UUID value to userspace
authorJohannes Thumshirn <jthumshirn@suse.de>
Wed, 7 Jun 2017 09:45:35 +0000 (11:45 +0200)
committerChristoph Hellwig <hch@lst.de>
Thu, 15 Jun 2017 12:30:20 +0000 (14:30 +0200)
commitd934f9848a77be4afe0ca336ea419dd066c934f3
tree9b762c4f0fcb087ff782cbea9770c6c5d338f301
parent3b22ba2682b43296b55f5b4e8c2e91b7248db02b
nvme: provide UUID value to userspace

Now that we have a way for getting the UUID from a target, provide it
to userspace as well.

Unfortunately there is already a sysfs attribute called UUID which is
a misnomer as it holds the NGUID value. So instead of creating yet
another wrong name, create a new 'nguid' sysfs attribute for the
NGUID. For the UUID attribute add a check wheter the namespace has a
UUID assigned to it and return this or return the NGUID to maintain
backwards compatibility. This should give userspace a chance to catch
up.

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Sagi Grimberg <sagi@rimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
drivers/nvme/host/core.c