From: Horst Hummel <horst.hummel@de.ibm.com>
From: Stefan Weinhuber <wein@de.ibm.com>

dasd driver changes:
 - Introduce "fixbuffers" dasd option that uses buffer pages for
   the dasd i/o similar to bounce buffers.
 - Fix I/O errors when using XRC.
 - Increment retry counter again if notifier callback is called with CIO_GONE.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>