Directly implemented ioctls

The following `old' CDROM-ioctls are implemented by directly calling device-operations in cdrom_device_ops, if implemented and not masked:

CDROMMULTISESSION

Requests the last session on a CDROM.

CDROMEJECT

Open tray.

CDROMCLOSETRAY

Close tray.

CDROMEJECT_SW

If arg 0, set behavior to auto-close (close tray on first open) and auto-eject (eject on last release), otherwise set behavior to non-moving on open() and release() calls.

CDROM_GET_MCN or CDROM_GET_UPC

Get the Medium Catalog Number from a CD.