From: Martin Schwidefsky <schwidefsky@de.ibm.com>

 - Add module license gpl.
 - Add debug messages.
 - Make blocksize persistent after close. Limit blocksize to 64k.
 - Check tape state against TS_INIT/TS_UNUSED for special case of
   medium sense and assign.
 - Assign tape as soon as they are set online and unassign when set offline.
 - Correct implementation of MT_EOD.
 - Add backward compatible tape.agent hotplug support (to be removed as soon
   as a full blown tape class is implemented).
 - Add state to differentiate between character device and block device access.
 - Make tape block device usable.
 - Add 34xx seek speedup code.
 - Fix device reference counting.
 - Fix online-offline-online cycle.
 - Add timeout to standard assign function.
 - Correct calculation of device index in tape_get_device().
 - Check idal buffer for fixed block size reads and writes.
 - Adapt to notify api change in cio.
 - Add sysfs attributes for tape state, first minor, current operation and
   current blocksize.