What about a different approach:
We already (nearly) have the scsimon patches to do hot plug events on SCSI
devices incorporated. Any identification could be done from the scsi device
hotplug script (i.e. if you see it's USB, get the GID, if it's enterprise
storage get the WWN, try the filesystem UUID etc). Then all the hotplug
script does is plug this device into some type of volume idenfication scheme
like /dev/volume/<name>.
Any application needing to always know where the device is would refer to it
by name, and since there's no prescription at all about what the <name> is,
you could even alias horribly unfriendly things like the WWN to more palatable
names using a user specified translation table.
This implementation doesn't even depend on SCSI, so it could potentially be
used by any subsystem (IDE, block devices).
The only component that doesn't exist is the configurable /dev/volume piece.
Since the name would be a property of the device node, it probably makes sense
to place this into the new driverfs somehow.
James
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