[PATCH] DVD+RW support

[PATCH] DVD+RW support

This patch adds support for using DVD+RW drives as writable block devices.

The patch is based on work from:

        Andy Polyakov <appro@fy.chalmers.se> - Wrote the 2.4 patch
        Nigel Kukard <nkukard@lbsd.net> - Initial porting to 2.6.x

It works for me using an Iomega Super DVD 8x USB drive.

  Nov 5 2001, Aug 8 2002. Modified by Andy Polyakov
  <appro@fy.chalmers.se> to support MMC-3 complaint DVD+RW units.

  Modified by Nigel Kukard <nkukard@lbsd.net> - support DVD+RW
  2.4.x patch by Andy Polyakov <appro@fy.chalmers.se>

This patch implements CDRW packet writing as a kernel block device.  Usage
instructions are in the packet-writing.txt file.

A hint: If you don't want to wait for a complete disc format, you can
format just a part of the disc.  For example:

        cdrwtool -d /dev/hdc -m 10240

This will format 10240 blocks, ie 20MB.

Signed-off-by: Peter Osterlund <petero2@telia.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>