On Thu, Jun 01, 2017 at 01:17:48PM +0200, Johannes Thumshirn wrote: > 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.
Sorry for the naming clash. Not sure why I didn't use the obvious name for this file in the first place. FWIW, tools should have been using the 'wwid' attribute, which returns either EUI64 or NGUID so a unique identifier can be gotten from a single file without checking for the existence of either. That should help not break backward compatibility, but I've no idea if anything actually relies on 'uuid' returning the NGUID.
