disks and CDs, it's just don't have to call DIOCLOCK before, unless we're
doing a forced eject: DIOCEJECT will check for device use and unlock the door
if allowed.
open the raw character device for nicknames (so that eject will open the
CD even without medias). Implement the raw_to_blk pathname conversion in
umount_mounted().
Create a new 'cdrom' type, add a '-l' switch which will cause a media load
on cdrom devices type.
Add 'sd0, sd1, sd2' nicknames to allow easy use with removable rewritable
disks (ZIP, jazz, MO, ...).
