Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3754 insertions, 0 deletions

diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
new file mode 100644
index 000000000..d3947388a
--- /dev/null
+++ b/drivers/cdrom/cdrom.c
@@ -0,0 +1,3754 @@
+/* linux/drivers/cdrom/cdrom.c
+   Copyright (c) 1996, 1997 David A. van Leeuwen.
+   Copyright (c) 1997, 1998 Erik Andersen <andersee@debian.org>
+   Copyright (c) 1998, 1999 Jens Axboe <axboe@image.dk>
+
+   May be copied or modified under the terms of the GNU General Public
+   License.  See linux/COPYING for more information.
+
+   Uniform CD-ROM driver for Linux.
+   See Documentation/cdrom/cdrom-standard.tex for usage information.
+
+   The routines in the file provide a uniform interface between the
+   software that uses CD-ROMs and the various low-level drivers that
+   actually talk to the hardware. Suggestions are welcome.
+   Patches that work are more welcome though.  ;-)
+
+ To Do List:
+ ----------------------------------
+
+ -- Modify sysctl/proc interface. I plan on having one directory per
+ drive, with entries for outputing general drive information, and sysctl
+ based tunable parameters such as whether the tray should auto-close for
+ that drive. Suggestions (or patches) for this welcome!
+
+
+ Revision History
+ ----------------------------------
+ 1.00  Date Unknown -- David van Leeuwen <david@tm.tno.nl>
+ -- Initial version by David A. van Leeuwen. I don't have a detailed
+  changelog for the 1.x series, David?
+
+2.00  Dec  2, 1997 -- Erik Andersen <andersee@debian.org>
+  -- New maintainer! As David A. van Leeuwen has been too busy to actively
+  maintain and improve this driver, I am now carrying on the torch. If
+  you have a problem with this driver, please feel free to contact me.
+
+  -- Added (rudimentary) sysctl interface. I realize this is really weak
+  right now, and is _very_ badly implemented. It will be improved...
+
+  -- Modified CDROM_DISC_STATUS so that it is now incorporated into
+  the Uniform CD-ROM driver via the cdrom_count_tracks function.
+  The cdrom_count_tracks function helps resolve some of the false
+  assumptions of the CDROM_DISC_STATUS ioctl, and is also used to check
+  for the correct media type when mounting or playing audio from a CD.
+
+  -- Remove the calls to verify_area and only use the copy_from_user and
+  copy_to_user stuff, since these calls now provide their own memory
+  checking with the 2.1.x kernels.
+
+  -- Major update to return codes so that errors from low-level drivers
+  are passed on through (thanks to Gerd Knorr for pointing out this
+  problem).
+
+  -- Made it so if a function isn't implemented in a low-level driver,
+  ENOSYS is now returned instead of EINVAL.
+
+  -- Simplified some complex logic so that the source code is easier to read.
+
+  -- Other stuff I probably forgot to mention (lots of changes).
+
+2.01 to 2.11 Dec 1997-Jan 1998
+  -- TO-DO!  Write changelogs for 2.01 to 2.12.
+
+2.12  Jan  24, 1998 -- Erik Andersen <andersee@debian.org>
+  -- Fixed a bug in the IOCTL_IN and IOCTL_OUT macros.  It turns out that
+  copy_*_user does not return EFAULT on error, but instead returns the number 
+  of bytes not copied.  I was returning whatever non-zero stuff came back from 
+  the copy_*_user functions directly, which would result in strange errors.
+
+2.13  July 17, 1998 -- Erik Andersen <andersee@debian.org>
+  -- Fixed a bug in CDROM_SELECT_SPEED where you couldn't lower the speed
+  of the drive.  Thanks to Tobias Ringstr|m <tori@prosolvia.se> for pointing
+  this out and providing a simple fix.
+  -- Fixed the procfs-unload-module bug with the fill_inode procfs callback.
+  thanks to Andrea Arcangeli
+  -- Fixed it so that the /proc entry now also shows up when cdrom is
+  compiled into the kernel.  Before it only worked when loaded as a module.
+
+  2.14 August 17, 1998 -- Erik Andersen <andersee@debian.org>
+  -- Fixed a bug in cdrom_media_changed and handling of reporting that
+  the media had changed for devices that _don't_ implement media_changed.  
+  Thanks to Grant R. Guenther <grant@torque.net> for spotting this bug.
+  -- Made a few things more pedanticly correct.
+
+2.50 Oct 19, 1998 - Jens Axboe <axboe@image.dk>
+  -- New maintainers! Erik was too busy to continue the work on the driver,
+  so now Chris Zwilling <chris@cloudnet.com> and Jens Axboe <axboe@image.dk>
+  will do their best to follow in his footsteps
+  
+  2.51 Dec 20, 1998 - Jens Axboe <axboe@image.dk>
+  -- Check if drive is capable of doing what we ask before blindly changing
+  cdi->options in various ioctl.
+  -- Added version to proc entry.
+  
+  2.52 Jan 16, 1999 - Jens Axboe <axboe@image.dk>
+  -- Fixed an error in open_for_data where we would sometimes not return
+  the correct error value. Thanks Huba Gaspar <huba@softcell.hu>.
+  -- Fixed module usage count - usage was based on /proc/sys/dev
+  instead of /proc/sys/dev/cdrom. This could lead to an oops when other
+  modules had entries in dev. Feb 02 - real bug was in sysctl.c where
+  dev would be removed even though it was used. cdrom.c just illuminated
+  that bug.
+  
+  2.53 Feb 22, 1999 - Jens Axboe <axboe@image.dk>
+  -- Fixup of several ioctl calls, in particular CDROM_SET_OPTIONS has
+  been "rewritten" because capabilities and options aren't in sync. They
+  should be...
+  -- Added CDROM_LOCKDOOR ioctl. Locks the door and keeps it that way.
+  -- Added CDROM_RESET ioctl.
+  -- Added CDROM_DEBUG ioctl. Enable debug messages on-the-fly.
+  -- Added CDROM_GET_CAPABILITY ioctl. This relieves userspace programs
+  from parsing /proc/sys/dev/cdrom/info.
+  
+  2.54 Mar 15, 1999 - Jens Axboe <axboe@image.dk>
+  -- Check capability mask from low level driver when counting tracks as
+  per suggestion from Corey J. Scotts <cstotts@blue.weeg.uiowa.edu>.
+  
+  2.55 Apr 25, 1999 - Jens Axboe <axboe@image.dk>
+  -- autoclose was mistakenly checked against CDC_OPEN_TRAY instead of
+  CDC_CLOSE_TRAY.
+  -- proc info didn't mask against capabilities mask.
+  
+  3.00 Aug 5, 1999 - Jens Axboe <axboe@image.dk>
+  -- Unified audio ioctl handling across CD-ROM drivers. A lot of the
+  code was duplicated before. Drives that support the generic packet
+  interface are now being fed packets from here instead.
+  -- First attempt at adding support for MMC2 commands - for DVD and
+  CD-R(W) drives. Only the DVD parts are in now - the interface used is
+  the same as for the audio ioctls.
+  -- ioctl cleanups. if a drive couldn't play audio, it didn't get
+  a change to perform device specific ioctls as well.
+  -- Defined CDROM_CAN(CDC_XXX) for checking the capabilities.
+  -- Put in sysctl files for autoclose, autoeject, check_media, debug,
+  and lock.
+  -- /proc/sys/dev/cdrom/info has been updated to also contain info about
+  CD-Rx and DVD capabilities.
+  -- Now default to checking media type.
+  -- CDROM_SEND_PACKET ioctl added. The infrastructure was in place for
+  doing this anyway, with the generic_packet addition.
+  
+  3.01 Aug 6, 1999 - Jens Axboe <axboe@image.dk>
+  -- Fix up the sysctl handling so that the option flags get set
+  correctly.
+  -- Fix up ioctl handling so the device specific ones actually get
+  called :).
+  
+  3.02 Aug 8, 1999 - Jens Axboe <axboe@image.dk>
+  -- Fixed volume control on SCSI drives (or others with longer audio
+  page).
+  -- Fixed a couple of DVD minors. Thanks to Andrew T. Veliath
+  <andrewtv@usa.net> for telling me and for having defined the various
+  DVD structures and ioctls in the first place! He designed the original
+  DVD patches for ide-cd and while I rearranged and unified them, the
+  interface is still the same.
+  
+  3.03 Sep 1, 1999 - Jens Axboe <axboe@image.dk>
+  -- Moved the rest of the audio ioctls from the CD-ROM drivers here. Only
+  CDROMREADTOCENTRY and CDROMREADTOCHDR are left.
+  -- Moved the CDROMREADxxx ioctls in here.
+  -- Defined the cdrom_get_last_written and cdrom_get_next_block as ioctls
+  and exported functions.
+  -- Erik Andersen <andersen@xmission.com> modified all SCMD_ commands
+  to now read GPCMD_ for the new generic packet interface. All low level
+  drivers are updated as well.
+  -- Various other cleanups.
+
+  3.04 Sep 12, 1999 - Jens Axboe <axboe@image.dk>
+  -- Fixed a couple of possible memory leaks (if an operation failed and
+  we didn't free the buffer before returning the error).
+  -- Integrated Uniform CD Changer handling from Richard Sharman
+  <rsharman@pobox.com>.
+  -- Defined CD_DVD and CD_CHANGER log levels.
+  -- Fixed the CDROMREADxxx ioctls.
+  -- CDROMPLAYTRKIND uses the GPCMD_PLAY_AUDIO_MSF command - too few
+  drives supported it. We lose the index part, however.
+  -- Small modifications to accommodate opens of /dev/hdc1, required
+  for ide-cd to handle multisession discs.
+  -- Export cdrom_mode_sense and cdrom_mode_select.
+  -- init_cdrom_command() for setting up a cgc command.
+  
+  3.05 Oct 24, 1999 - Jens Axboe <axboe@image.dk>
+  -- Changed the interface for CDROM_SEND_PACKET. Before it was virtually
+  impossible to send the drive data in a sensible way.
+  -- Lowered stack usage in mmc_ioctl(), dvd_read_disckey(), and
+  dvd_read_manufact.
+  -- Added setup of write mode for packet writing.
+  -- Fixed CDDA ripping with cdda2wav - accept much larger requests of
+  number of frames and split the reads in blocks of 8.
+
+  3.06 Dec 13, 1999 - Jens Axboe <axboe@image.dk>
+  -- Added support for changing the region of DVD drives.
+  -- Added sense data to generic command.
+
+  3.07 Feb 2, 2000 - Jens Axboe <axboe@suse.de>
+  -- Do same "read header length" trick in cdrom_get_disc_info() as
+  we do in cdrom_get_track_info() -- some drive don't obey specs and
+  fail if they can't supply the full Mt Fuji size table.
+  -- Deleted stuff related to setting up write modes. It has a different
+  home now.
+  -- Clear header length in mode_select unconditionally.
+  -- Removed the register_disk() that was added, not needed here.
+
+  3.08 May 1, 2000 - Jens Axboe <axboe@suse.de>
+  -- Fix direction flag in setup_send_key and setup_report_key. This
+  gave some SCSI adapters problems.
+  -- Always return -EROFS for write opens
+  -- Convert to module_init/module_exit style init and remove some
+  of the #ifdef MODULE stuff
+  -- Fix several dvd errors - DVD_LU_SEND_ASF should pass agid,
+  DVD_HOST_SEND_RPC_STATE did not set buffer size in cdb, and
+  dvd_do_auth passed uninitialized data to drive because init_cdrom_command
+  did not clear a 0 sized buffer.
+  
+  3.09 May 12, 2000 - Jens Axboe <axboe@suse.de>
+  -- Fix Video-CD on SCSI drives that don't support READ_CD command. In
+  that case switch block size and issue plain READ_10 again, then switch
+  back.
+
+  3.10 Jun 10, 2000 - Jens Axboe <axboe@suse.de>
+  -- Fix volume control on CD's - old SCSI-II drives now use their own
+  code, as doing MODE6 stuff in here is really not my intention.
+  -- Use READ_DISC_INFO for more reliable end-of-disc.
+
+  3.11 Jun 12, 2000 - Jens Axboe <axboe@suse.de>
+  -- Fix bug in getting rpc phase 2 region info.
+  -- Reinstate "correct" CDROMPLAYTRKIND
+
+   3.12 Oct 18, 2000 - Jens Axboe <axboe@suse.de>
+  -- Use quiet bit on packet commands not known to work
+
+   3.20 Dec 17, 2003 - Jens Axboe <axboe@suse.de>
+  -- Various fixes and lots of cleanups not listed :-)
+  -- Locking fixes
+  -- Mt Rainier support
+  -- DVD-RAM write open fixes
+
+  Nov 5 2001, Aug 8 2002. Modified by Andy Polyakov
+  <appro@fy.chalmers.se> to support MMC-3 compliant DVD+RW units.
+
+  Modified by Nigel Kukard <nkukard@lbsd.net> - support DVD+RW
+  2.4.x patch by Andy Polyakov <appro@fy.chalmers.se>
+
+-------------------------------------------------------------------------*/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#define REVISION "Revision: 3.20"
+#define VERSION "Id: cdrom.c 3.20 2003/12/17"
+
+/* I use an error-log mask to give fine grain control over the type of
+   messages dumped to the system logs.  The available masks include: */
+#define CD_NOTHING      0x0
+#define CD_WARNING	0x1
+#define CD_REG_UNREG	0x2
+#define CD_DO_IOCTL	0x4
+#define CD_OPEN		0x8
+#define CD_CLOSE	0x10
+#define CD_COUNT_TRACKS 0x20
+#define CD_CHANGER	0x40
+#define CD_DVD		0x80
+
+/* Define this to remove _all_ the debugging messages */
+/* #define ERRLOGMASK CD_NOTHING */
+#define ERRLOGMASK CD_WARNING
+/* #define ERRLOGMASK (CD_WARNING|CD_OPEN|CD_COUNT_TRACKS|CD_CLOSE) */
+/* #define ERRLOGMASK (CD_WARNING|CD_REG_UNREG|CD_DO_IOCTL|CD_OPEN|CD_CLOSE|CD_COUNT_TRACKS) */
+
+#include <linux/atomic.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/major.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/slab.h> 
+#include <linux/cdrom.h>
+#include <linux/sysctl.h>
+#include <linux/proc_fs.h>
+#include <linux/blkpg.h>
+#include <linux/init.h>
+#include <linux/fcntl.h>
+#include <linux/blkdev.h>
+#include <linux/times.h>
+#include <linux/uaccess.h>
+#include <scsi/scsi_common.h>
+#include <scsi/scsi_request.h>
+
+/* used to tell the module to turn on full debugging messages */
+static bool debug;
+/* default compatibility mode */
+static bool autoclose=1;
+static bool autoeject;
+static bool lockdoor = 1;
+/* will we ever get to use this... sigh. */
+static bool check_media_type;
+/* automatically restart mrw format */
+static bool mrw_format_restart = 1;
+module_param(debug, bool, 0);
+module_param(autoclose, bool, 0);
+module_param(autoeject, bool, 0);
+module_param(lockdoor, bool, 0);
+module_param(check_media_type, bool, 0);
+module_param(mrw_format_restart, bool, 0);
+
+static DEFINE_MUTEX(cdrom_mutex);
+
+static const char *mrw_format_status[] = {
+	"not mrw",
+	"bgformat inactive",
+	"bgformat active",
+	"mrw complete",
+};
+
+static const char *mrw_address_space[] = { "DMA", "GAA" };
+
+#if (ERRLOGMASK != CD_NOTHING)
+#define cd_dbg(type, fmt, ...)				\
+do {							\
+	if ((ERRLOGMASK & type) || debug == 1)		\
+		pr_debug(fmt, ##__VA_ARGS__);		\
+} while (0)
+#else
+#define cd_dbg(type, fmt, ...)				\
+do {							\
+	if (0 && (ERRLOGMASK & type) || debug == 1)	\
+		pr_debug(fmt, ##__VA_ARGS__);		\
+} while (0)
+#endif
+
+/* The (cdo->capability & ~cdi->mask & CDC_XXX) construct was used in
+   a lot of places. This macro makes the code more clear. */
+#define CDROM_CAN(type) (cdi->ops->capability & ~cdi->mask & (type))
+
+/*
+ * Another popular OS uses 7 seconds as the hard timeout for default
+ * commands, so it is a good choice for us as well.
+ */
+#define CDROM_DEF_TIMEOUT	(7 * HZ)
+
+/* Not-exported routines. */
+
+static void cdrom_sysctl_register(void);
+
+static LIST_HEAD(cdrom_list);
+
+int cdrom_dummy_generic_packet(struct cdrom_device_info *cdi,
+			       struct packet_command *cgc)
+{
+	if (cgc->sshdr) {
+		cgc->sshdr->sense_key = 0x05;
+		cgc->sshdr->asc = 0x20;
+		cgc->sshdr->ascq = 0x00;
+	}
+
+	cgc->stat = -EIO;
+	return -EIO;
+}
+EXPORT_SYMBOL(cdrom_dummy_generic_packet);
+
+static int cdrom_flush_cache(struct cdrom_device_info *cdi)
+{
+	struct packet_command cgc;
+
+	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
+	cgc.cmd[0] = GPCMD_FLUSH_CACHE;
+
+	cgc.timeout = 5 * 60 * HZ;
+
+	return cdi->ops->generic_packet(cdi, &cgc);
+}
+
+/* requires CD R/RW */
+static int cdrom_get_disc_info(struct cdrom_device_info *cdi,
+			       disc_information *di)
+{
+	const struct cdrom_device_ops *cdo = cdi->ops;
+	struct packet_command cgc;
+	int ret, buflen;
+
+	/* set up command and get the disc info */
+	init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
+	cgc.cmd[0] = GPCMD_READ_DISC_INFO;
+	cgc.cmd[8] = cgc.buflen = 2;
+	cgc.quiet = 1;
+
+	ret = cdo->generic_packet(cdi, &cgc);
+	if (ret)
+		return ret;
+
+	/* not all drives have the same disc_info length, so requeue
+	 * packet with the length the drive tells us it can supply
+	 */
+	buflen = be16_to_cpu(di->disc_information_length) +
+		sizeof(di->disc_information_length);
+
+	if (buflen > sizeof(disc_information))
+		buflen = sizeof(disc_information);
+
+	cgc.cmd[8] = cgc.buflen = buflen;
+	ret = cdo->generic_packet(cdi, &cgc);
+	if (ret)
+		return ret;
+
+	/* return actual fill size */
+	return buflen;
+}
+
+/* This macro makes sure we don't have to check on cdrom_device_ops
+ * existence in the run-time routines below. Change_capability is a
+ * hack to have the capability flags defined const, while we can still
+ * change it here without gcc complaining at every line.
+ */
+#define ENSURE(cdo, call, bits)					\
+do {								\
+	if (cdo->call == NULL)					\
+		WARN_ON_ONCE((cdo)->capability & (bits));	\
+} while (0)
+
+/*
+ * the first prototypes used 0x2c as the page code for the mrw mode page,
+ * subsequently this was changed to 0x03. probe the one used by this drive
+ */
+static int cdrom_mrw_probe_pc(struct cdrom_device_info *cdi)
+{
+	struct packet_command cgc;
+	char buffer[16];
+
+	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
+
+	cgc.timeout = HZ;
+	cgc.quiet = 1;
+
+	if (!cdrom_mode_sense(cdi, &cgc, MRW_MODE_PC, 0)) {
+		cdi->mrw_mode_page = MRW_MODE_PC;
+		return 0;
+	} else if (!cdrom_mode_sense(cdi, &cgc, MRW_MODE_PC_PRE1, 0)) {
+		cdi->mrw_mode_page = MRW_MODE_PC_PRE1;
+		return 0;
+	}
+
+	return 1;
+}
+
+static int cdrom_is_mrw(struct cdrom_device_info *cdi, int *write)
+{
+	struct packet_command cgc;
+	struct mrw_feature_desc *mfd;
+	unsigned char buffer[16];
+	int ret;
+
+	*write = 0;
+
+	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
+
+	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
+	cgc.cmd[3] = CDF_MRW;
+	cgc.cmd[8] = sizeof(buffer);
+	cgc.quiet = 1;
+
+	if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
+		return ret;
+
+	mfd = (struct mrw_feature_desc *)&buffer[sizeof(struct feature_header)];
+	if (be16_to_cpu(mfd->feature_code) != CDF_MRW)
+		return 1;
+	*write = mfd->write;
+
+	if ((ret = cdrom_mrw_probe_pc(cdi))) {
+		*write = 0;
+		return ret;
+	}
+
+	return 0;
+}
+
+static int cdrom_mrw_bgformat(struct cdrom_device_info *cdi, int cont)
+{
+	struct packet_command cgc;
+	unsigned char buffer[12];
+	int ret;
+
+	pr_info("%sstarting format\n", cont ? "Re" : "");
+
+	/*
+	 * FmtData bit set (bit 4), format type is 1
+	 */
+	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_WRITE);
+	cgc.cmd[0] = GPCMD_FORMAT_UNIT;
+	cgc.cmd[1] = (1 << 4) | 1;
+
+	cgc.timeout = 5 * 60 * HZ;
+
+	/*
+	 * 4 byte format list header, 8 byte format list descriptor
+	 */
+	buffer[1] = 1 << 1;
+	buffer[3] = 8;
+
+	/*
+	 * nr_blocks field
+	 */
+	buffer[4] = 0xff;
+	buffer[5] = 0xff;
+	buffer[6] = 0xff;
+	buffer[7] = 0xff;
+
+	buffer[8] = 0x24 << 2;
+	buffer[11] = cont;
+
+	ret = cdi->ops->generic_packet(cdi, &cgc);
+	if (ret)
+		pr_info("bgformat failed\n");
+
+	return ret;
+}
+
+static int cdrom_mrw_bgformat_susp(struct cdrom_device_info *cdi, int immed)
+{
+	struct packet_command cgc;
+
+	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
+	cgc.cmd[0] = GPCMD_CLOSE_TRACK;
+
+	/*
+	 * Session = 1, Track = 0
+	 */
+	cgc.cmd[1] = !!immed;
+	cgc.cmd[2] = 1 << 1;
+
+	cgc.timeout = 5 * 60 * HZ;
+
+	return cdi->ops->generic_packet(cdi, &cgc);
+}
+
+static int cdrom_mrw_exit(struct cdrom_device_info *cdi)
+{
+	disc_information di;
+	int ret;
+
+	ret = cdrom_get_disc_info(cdi, &di);
+	if (ret < 0 || ret < (int)offsetof(typeof(di),disc_type))
+		return 1;
+
+	ret = 0;
+	if (di.mrw_status == CDM_MRW_BGFORMAT_ACTIVE) {
+		pr_info("issuing MRW background format suspend\n");
+		ret = cdrom_mrw_bgformat_susp(cdi, 0);
+	}
+
+	if (!ret && cdi->media_written)
+		ret = cdrom_flush_cache(cdi);
+
+	return ret;
+}
+
+static int cdrom_mrw_set_lba_space(struct cdrom_device_info *cdi, int space)
+{
+	struct packet_command cgc;
+	struct mode_page_header *mph;
+	char buffer[16];
+	int ret, offset, size;
+
+	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
+
+	cgc.buffer = buffer;
+	cgc.buflen = sizeof(buffer);
+
+	ret = cdrom_mode_sense(cdi, &cgc, cdi->mrw_mode_page, 0);
+	if (ret)
+		return ret;
+
+	mph = (struct mode_page_header *)buffer;
+	offset = be16_to_cpu(mph->desc_length);
+	size = be16_to_cpu(mph->mode_data_length) + 2;
+
+	buffer[offset + 3] = space;
+	cgc.buflen = size;
+
+	ret = cdrom_mode_select(cdi, &cgc);
+	if (ret)
+		return ret;
+
+	pr_info("%s: mrw address space %s selected\n",
+		cdi->name, mrw_address_space[space]);
+	return 0;
+}
+
+int register_cdrom(struct cdrom_device_info *cdi)
+{
+	static char banner_printed;
+	const struct cdrom_device_ops *cdo = cdi->ops;
+
+	cd_dbg(CD_OPEN, "entering register_cdrom\n");
+
+	if (cdo->open == NULL || cdo->release == NULL)
+		return -EINVAL;
+	if (!banner_printed) {
+		pr_info("Uniform CD-ROM driver " REVISION "\n");
+		banner_printed = 1;
+		cdrom_sysctl_register();
+	}
+
+	ENSURE(cdo, drive_status, CDC_DRIVE_STATUS);
+	if (cdo->check_events == NULL && cdo->media_changed == NULL)
+		WARN_ON_ONCE(cdo->capability & (CDC_MEDIA_CHANGED | CDC_SELECT_DISC));
+	ENSURE(cdo, tray_move, CDC_CLOSE_TRAY | CDC_OPEN_TRAY);
+	ENSURE(cdo, lock_door, CDC_LOCK);
+	ENSURE(cdo, select_speed, CDC_SELECT_SPEED);
+	ENSURE(cdo, get_last_session, CDC_MULTI_SESSION);
+	ENSURE(cdo, get_mcn, CDC_MCN);
+	ENSURE(cdo, reset, CDC_RESET);
+	ENSURE(cdo, generic_packet, CDC_GENERIC_PACKET);
+	cdi->mc_flags = 0;
+	cdi->options = CDO_USE_FFLAGS;
+
+	if (autoclose == 1 && CDROM_CAN(CDC_CLOSE_TRAY))
+		cdi->options |= (int) CDO_AUTO_CLOSE;
+	if (autoeject == 1 && CDROM_CAN(CDC_OPEN_TRAY))
+		cdi->options |= (int) CDO_AUTO_EJECT;
+	if (lockdoor == 1)
+		cdi->options |= (int) CDO_LOCK;
+	if (check_media_type == 1)
+		cdi->options |= (int) CDO_CHECK_TYPE;
+
+	if (CDROM_CAN(CDC_MRW_W))
+		cdi->exit = cdrom_mrw_exit;
+
+	if (cdi->disk)
+		cdi->cdda_method = CDDA_BPC_FULL;
+	else
+		cdi->cdda_method = CDDA_OLD;
+
+	WARN_ON(!cdo->generic_packet);
+
+	cd_dbg(CD_REG_UNREG, "drive \"/dev/%s\" registered\n", cdi->name);
+	mutex_lock(&cdrom_mutex);
+	list_add(&cdi->list, &cdrom_list);
+	mutex_unlock(&cdrom_mutex);
+	return 0;
+}
+#undef ENSURE
+
+void unregister_cdrom(struct cdrom_device_info *cdi)
+{
+	cd_dbg(CD_OPEN, "entering unregister_cdrom\n");
+
+	mutex_lock(&cdrom_mutex);
+	list_del(&cdi->list);
+	mutex_unlock(&cdrom_mutex);
+
+	if (cdi->exit)
+		cdi->exit(cdi);
+
+	cd_dbg(CD_REG_UNREG, "drive \"/dev/%s\" unregistered\n", cdi->name);
+}
+
+int cdrom_get_media_event(struct cdrom_device_info *cdi,
+			  struct media_event_desc *med)
+{
+	struct packet_command cgc;
+	unsigned char buffer[8];
+	struct event_header *eh = (struct event_header *)buffer;
+
+	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
+	cgc.cmd[0] = GPCMD_GET_EVENT_STATUS_NOTIFICATION;
+	cgc.cmd[1] = 1;		/* IMMED */
+	cgc.cmd[4] = 1 << 4;	/* media event */
+	cgc.cmd[8] = sizeof(buffer);
+	cgc.quiet = 1;
+
+	if (cdi->ops->generic_packet(cdi, &cgc))
+		return 1;
+
+	if (be16_to_cpu(eh->data_len) < sizeof(*med))
+		return 1;
+
+	if (eh->nea || eh->notification_class != 0x4)
+		return 1;
+
+	memcpy(med, &buffer[sizeof(*eh)], sizeof(*med));
+	return 0;
+}
+
+static int cdrom_get_random_writable(struct cdrom_device_info *cdi,
+			      struct rwrt_feature_desc *rfd)
+{
+	struct packet_command cgc;
+	char buffer[24];
+	int ret;
+
+	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
+
+	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;	/* often 0x46 */
+	cgc.cmd[3] = CDF_RWRT;			/* often 0x0020 */
+	cgc.cmd[8] = sizeof(buffer);		/* often 0x18 */
+	cgc.quiet = 1;
+
+	if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
+		return ret;
+
+	memcpy(rfd, &buffer[sizeof(struct feature_header)], sizeof (*rfd));
+	return 0;
+}
+
+static int cdrom_has_defect_mgt(struct cdrom_device_info *cdi)
+{
+	struct packet_command cgc;
+	char buffer[16];
+	__be16 *feature_code;
+	int ret;
+
+	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
+
+	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
+	cgc.cmd[3] = CDF_HWDM;
+	cgc.cmd[8] = sizeof(buffer);
+	cgc.quiet = 1;
+
+	if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
+		return ret;
+
+	feature_code = (__be16 *) &buffer[sizeof(struct feature_header)];
+	if (be16_to_cpu(*feature_code) == CDF_HWDM)
+		return 0;
+
+	return 1;
+}
+
+
+static int cdrom_is_random_writable(struct cdrom_device_info *cdi, int *write)
+{
+	struct rwrt_feature_desc rfd;
+	int ret;
+
+	*write = 0;
+
+	if ((ret = cdrom_get_random_writable(cdi, &rfd)))
+		return ret;
+
+	if (CDF_RWRT == be16_to_cpu(rfd.feature_code))
+		*write = 1;
+
+	return 0;
+}
+
+static int cdrom_media_erasable(struct cdrom_device_info *cdi)
+{
+	disc_information di;
+	int ret;
+
+	ret = cdrom_get_disc_info(cdi, &di);
+	if (ret < 0 || ret < offsetof(typeof(di), n_first_track))
+		return -1;
+
+	return di.erasable;
+}
+
+/*
+ * FIXME: check RO bit
+ */
+static int cdrom_dvdram_open_write(struct cdrom_device_info *cdi)
+{
+	int ret = cdrom_media_erasable(cdi);
+
+	/*
+	 * allow writable open if media info read worked and media is
+	 * erasable, _or_ if it fails since not all drives support it
+	 */
+	if (!ret)
+		return 1;
+
+	return 0;
+}
+
+static int cdrom_mrw_open_write(struct cdrom_device_info *cdi)
+{
+	disc_information di;
+	int ret;
+
+	/*
+	 * always reset to DMA lba space on open
+	 */
+	if (cdrom_mrw_set_lba_space(cdi, MRW_LBA_DMA)) {
+		pr_err("failed setting lba address space\n");
+		return 1;
+	}
+
+	ret = cdrom_get_disc_info(cdi, &di);
+	if (ret < 0 || ret < offsetof(typeof(di),disc_type))
+		return 1;
+
+	if (!di.erasable)
+		return 1;
+
+	/*
+	 * mrw_status
+	 * 0	-	not MRW formatted
+	 * 1	-	MRW bgformat started, but not running or complete
+	 * 2	-	MRW bgformat in progress
+	 * 3	-	MRW formatting complete
+	 */
+	ret = 0;
+	pr_info("open: mrw_status '%s'\n", mrw_format_status[di.mrw_status]);
+	if (!di.mrw_status)
+		ret = 1;
+	else if (di.mrw_status == CDM_MRW_BGFORMAT_INACTIVE &&
+			mrw_format_restart)
+		ret = cdrom_mrw_bgformat(cdi, 1);
+
+	return ret;
+}
+
+static int mo_open_write(struct cdrom_device_info *cdi)
+{
+	struct packet_command cgc;
+	char buffer[255];
+	int ret;
+
+	init_cdrom_command(&cgc, &buffer, 4, CGC_DATA_READ);
+	cgc.quiet = 1;
+
+	/*
+	 * obtain write protect information as per
+	 * drivers/scsi/sd.c:sd_read_write_protect_flag
+	 */
+
+	ret = cdrom_mode_sense(cdi, &cgc, GPMODE_ALL_PAGES, 0);
+	if (ret)
+		ret = cdrom_mode_sense(cdi, &cgc, GPMODE_VENDOR_PAGE, 0);
+	if (ret) {
+		cgc.buflen = 255;
+		ret = cdrom_mode_sense(cdi, &cgc, GPMODE_ALL_PAGES, 0);
+	}
+
+	/* drive gave us no info, let the user go ahead */
+	if (ret)
+		return 0;
+
+	return buffer[3] & 0x80;
+}
+
+static int cdrom_ram_open_write(struct cdrom_device_info *cdi)
+{
+	struct rwrt_feature_desc rfd;
+	int ret;
+
+	if ((ret = cdrom_has_defect_mgt(cdi)))
+		return ret;
+
+	if ((ret = cdrom_get_random_writable(cdi, &rfd)))
+		return ret;
+	else if (CDF_RWRT == be16_to_cpu(rfd.feature_code))
+		ret = !rfd.curr;
+
+	cd_dbg(CD_OPEN, "can open for random write\n");
+	return ret;
+}
+
+static void cdrom_mmc3_profile(struct cdrom_device_info *cdi)
+{
+	struct packet_command cgc;
+	char buffer[32];
+	int ret, mmc3_profile;
+
+	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
+
+	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
+	cgc.cmd[1] = 0;
+	cgc.cmd[2] = cgc.cmd[3] = 0;		/* Starting Feature Number */
+	cgc.cmd[8] = sizeof(buffer);		/* Allocation Length */
+	cgc.quiet = 1;
+
+	if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
+		mmc3_profile = 0xffff;
+	else
+		mmc3_profile = (buffer[6] << 8) | buffer[7];
+
+	cdi->mmc3_profile = mmc3_profile;
+}
+
+static int cdrom_is_dvd_rw(struct cdrom_device_info *cdi)
+{
+	switch (cdi->mmc3_profile) {
+	case 0x12:	/* DVD-RAM	*/
+	case 0x1A:	/* DVD+RW	*/
+	case 0x43:	/* BD-RE	*/
+		return 0;
+	default:
+		return 1;
+	}
+}
+
+/*
+ * returns 0 for ok to open write, non-0 to disallow
+ */
+static int cdrom_open_write(struct cdrom_device_info *cdi)
+{
+	int mrw, mrw_write, ram_write;
+	int ret = 1;
+
+	mrw = 0;
+	if (!cdrom_is_mrw(cdi, &mrw_write))
+		mrw = 1;
+
+	if (CDROM_CAN(CDC_MO_DRIVE))
+		ram_write = 1;
+	else
+		(void) cdrom_is_random_writable(cdi, &ram_write);
+	
+	if (mrw)
+		cdi->mask &= ~CDC_MRW;
+	else
+		cdi->mask |= CDC_MRW;
+
+	if (mrw_write)
+		cdi->mask &= ~CDC_MRW_W;
+	else
+		cdi->mask |= CDC_MRW_W;
+
+	if (ram_write)
+		cdi->mask &= ~CDC_RAM;
+	else
+		cdi->mask |= CDC_RAM;
+
+	if (CDROM_CAN(CDC_MRW_W))
+		ret = cdrom_mrw_open_write(cdi);
+	else if (CDROM_CAN(CDC_DVD_RAM))
+		ret = cdrom_dvdram_open_write(cdi);
+ 	else if (CDROM_CAN(CDC_RAM) &&
+ 		 !CDROM_CAN(CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_MRW|CDC_MO_DRIVE))
+ 		ret = cdrom_ram_open_write(cdi);
+	else if (CDROM_CAN(CDC_MO_DRIVE))
+		ret = mo_open_write(cdi);
+	else if (!cdrom_is_dvd_rw(cdi))
+		ret = 0;
+
+	return ret;
+}
+
+static void cdrom_dvd_rw_close_write(struct cdrom_device_info *cdi)
+{
+	struct packet_command cgc;
+
+	if (cdi->mmc3_profile != 0x1a) {
+		cd_dbg(CD_CLOSE, "%s: No DVD+RW\n", cdi->name);
+		return;
+	}
+
+	if (!cdi->media_written) {
+		cd_dbg(CD_CLOSE, "%s: DVD+RW media clean\n", cdi->name);
+		return;
+	}
+
+	pr_info("%s: dirty DVD+RW media, \"finalizing\"\n", cdi->name);
+
+	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
+	cgc.cmd[0] = GPCMD_FLUSH_CACHE;
+	cgc.timeout = 30*HZ;
+	cdi->ops->generic_packet(cdi, &cgc);
+
+	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
+	cgc.cmd[0] = GPCMD_CLOSE_TRACK;
+	cgc.timeout = 3000*HZ;
+	cgc.quiet = 1;
+	cdi->ops->generic_packet(cdi, &cgc);
+
+	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
+	cgc.cmd[0] = GPCMD_CLOSE_TRACK;
+	cgc.cmd[2] = 2;	 /* Close session */
+	cgc.quiet = 1;
+	cgc.timeout = 3000*HZ;
+	cdi->ops->generic_packet(cdi, &cgc);
+
+	cdi->media_written = 0;
+}
+
+static int cdrom_close_write(struct cdrom_device_info *cdi)
+{
+#if 0
+	return cdrom_flush_cache(cdi);
+#else
+	return 0;
+#endif
+}
+
+/* badly broken, I know. Is due for a fixup anytime. */
+static void cdrom_count_tracks(struct cdrom_device_info *cdi, tracktype *tracks)
+{
+	struct cdrom_tochdr header;
+	struct cdrom_tocentry entry;
+	int ret, i;
+	tracks->data = 0;
+	tracks->audio = 0;
+	tracks->cdi = 0;
+	tracks->xa = 0;
+	tracks->error = 0;
+	cd_dbg(CD_COUNT_TRACKS, "entering cdrom_count_tracks\n");
+
+	if (!CDROM_CAN(CDC_PLAY_AUDIO)) {
+		tracks->error = CDS_NO_INFO;
+		return;
+	}
+
+	/* Grab the TOC header so we can see how many tracks there are */
+	ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCHDR, &header);
+	if (ret) {
+		if (ret == -ENOMEDIUM)
+			tracks->error = CDS_NO_DISC;
+		else
+			tracks->error = CDS_NO_INFO;
+		return;
+	}
+	/* check what type of tracks are on this disc */
+	entry.cdte_format = CDROM_MSF;
+	for (i = header.cdth_trk0; i <= header.cdth_trk1; i++) {
+		entry.cdte_track = i;
+		if (cdi->ops->audio_ioctl(cdi, CDROMREADTOCENTRY, &entry)) {
+			tracks->error = CDS_NO_INFO;
+			return;
+		}
+		if (entry.cdte_ctrl & CDROM_DATA_TRACK) {
+			if (entry.cdte_format == 0x10)
+				tracks->cdi++;
+			else if (entry.cdte_format == 0x20)
+				tracks->xa++;
+			else
+				tracks->data++;
+		} else {
+			tracks->audio++;
+		}
+		cd_dbg(CD_COUNT_TRACKS, "track %d: format=%d, ctrl=%d\n",
+		       i, entry.cdte_format, entry.cdte_ctrl);
+	}
+	cd_dbg(CD_COUNT_TRACKS, "disc has %d tracks: %d=audio %d=data %d=Cd-I %d=XA\n",
+	       header.cdth_trk1, tracks->audio, tracks->data,
+	       tracks->cdi, tracks->xa);
+}
+
+static
+int open_for_data(struct cdrom_device_info *cdi)
+{
+	int ret;
+	const struct cdrom_device_ops *cdo = cdi->ops;
+	tracktype tracks;
+	cd_dbg(CD_OPEN, "entering open_for_data\n");
+	/* Check if the driver can report drive status.  If it can, we
+	   can do clever things.  If it can't, well, we at least tried! */
+	if (cdo->drive_status != NULL) {
+		ret = cdo->drive_status(cdi, CDSL_CURRENT);
+		cd_dbg(CD_OPEN, "drive_status=%d\n", ret);
+		if (ret == CDS_TRAY_OPEN) {
+			cd_dbg(CD_OPEN, "the tray is open...\n");
+			/* can/may i close it? */
+			if (CDROM_CAN(CDC_CLOSE_TRAY) &&
+			    cdi->options & CDO_AUTO_CLOSE) {
+				cd_dbg(CD_OPEN, "trying to close the tray\n");
+				ret=cdo->tray_move(cdi,0);
+				if (ret) {
+					cd_dbg(CD_OPEN, "bummer. tried to close the tray but failed.\n");
+					/* Ignore the error from the low
+					level driver.  We don't care why it
+					couldn't close the tray.  We only care 
+					that there is no disc in the drive, 
+					since that is the _REAL_ problem here.*/
+					ret=-ENOMEDIUM;
+					goto clean_up_and_return;
+				}
+			} else {
+				cd_dbg(CD_OPEN, "bummer. this drive can't close the tray.\n");
+				ret=-ENOMEDIUM;
+				goto clean_up_and_return;
+			}
+			/* Ok, the door should be closed now.. Check again */
+			ret = cdo->drive_status(cdi, CDSL_CURRENT);
+			if ((ret == CDS_NO_DISC) || (ret==CDS_TRAY_OPEN)) {
+				cd_dbg(CD_OPEN, "bummer. the tray is still not closed.\n");
+				cd_dbg(CD_OPEN, "tray might not contain a medium\n");
+				ret=-ENOMEDIUM;
+				goto clean_up_and_return;
+			}
+			cd_dbg(CD_OPEN, "the tray is now closed\n");
+		}
+		/* the door should be closed now, check for the disc */
+		ret = cdo->drive_status(cdi, CDSL_CURRENT);
+		if (ret!=CDS_DISC_OK) {
+			ret = -ENOMEDIUM;
+			goto clean_up_and_return;
+		}
+	}
+	cdrom_count_tracks(cdi, &tracks);
+	if (tracks.error == CDS_NO_DISC) {
+		cd_dbg(CD_OPEN, "bummer. no disc.\n");
+		ret=-ENOMEDIUM;
+		goto clean_up_and_return;
+	}
+	/* CD-Players which don't use O_NONBLOCK, workman
+	 * for example, need bit CDO_CHECK_TYPE cleared! */
+	if (tracks.data==0) {
+		if (cdi->options & CDO_CHECK_TYPE) {
+		    /* give people a warning shot, now that CDO_CHECK_TYPE
+		       is the default case! */
+		    cd_dbg(CD_OPEN, "bummer. wrong media type.\n");
+		    cd_dbg(CD_WARNING, "pid %d must open device O_NONBLOCK!\n",
+			   (unsigned int)task_pid_nr(current));
+		    ret=-EMEDIUMTYPE;
+		    goto clean_up_and_return;
+		}
+		else {
+		    cd_dbg(CD_OPEN, "wrong media type, but CDO_CHECK_TYPE not set\n");
+		}
+	}
+
+	cd_dbg(CD_OPEN, "all seems well, opening the devicen");
+
+	/* all seems well, we can open the device */
+	ret = cdo->open(cdi, 0); /* open for data */
+	cd_dbg(CD_OPEN, "opening the device gave me %d\n", ret);
+	/* After all this careful checking, we shouldn't have problems
+	   opening the device, but we don't want the device locked if 
+	   this somehow fails... */
+	if (ret) {
+		cd_dbg(CD_OPEN, "open device failed\n");
+		goto clean_up_and_return;
+	}
+	if (CDROM_CAN(CDC_LOCK) && (cdi->options & CDO_LOCK)) {
+			cdo->lock_door(cdi, 1);
+			cd_dbg(CD_OPEN, "door locked\n");
+	}
+	cd_dbg(CD_OPEN, "device opened successfully\n");
+	return ret;
+
+	/* Something failed.  Try to unlock the drive, because some drivers
+	(notably ide-cd) lock the drive after every command.  This produced
+	a nasty bug where after mount failed, the drive would remain locked!  
+	This ensures that the drive gets unlocked after a mount fails.  This 
+	is a goto to avoid bloating the driver with redundant code. */ 
+clean_up_and_return:
+	cd_dbg(CD_OPEN, "open failed\n");
+	if (CDROM_CAN(CDC_LOCK) && cdi->options & CDO_LOCK) {
+			cdo->lock_door(cdi, 0);
+			cd_dbg(CD_OPEN, "door unlocked\n");
+	}
+	return ret;
+}
+
+/* We use the open-option O_NONBLOCK to indicate that the
+ * purpose of opening is only for subsequent ioctl() calls; no device
+ * integrity checks are performed.
+ *
+ * We hope that all cd-player programs will adopt this convention. It
+ * is in their own interest: device control becomes a lot easier
+ * this way.
+ */
+int cdrom_open(struct cdrom_device_info *cdi, struct block_device *bdev,
+	       fmode_t mode)
+{
+	int ret;
+
+	cd_dbg(CD_OPEN, "entering cdrom_open\n");
+
+	/* if this was a O_NONBLOCK open and we should honor the flags,
+	 * do a quick open without drive/disc integrity checks. */
+	cdi->use_count++;
+	if ((mode & FMODE_NDELAY) && (cdi->options & CDO_USE_FFLAGS)) {
+		ret = cdi->ops->open(cdi, 1);
+	} else {
+		ret = open_for_data(cdi);
+		if (ret)
+			goto err;
+		if (CDROM_CAN(CDC_GENERIC_PACKET))
+			cdrom_mmc3_profile(cdi);
+		if (mode & FMODE_WRITE) {
+			ret = -EROFS;
+			if (cdrom_open_write(cdi))
+				goto err_release;
+			if (!CDROM_CAN(CDC_RAM))
+				goto err_release;
+			ret = 0;
+			cdi->media_written = 0;
+		}
+	}
+
+	if (ret)
+		goto err;
+
+	cd_dbg(CD_OPEN, "Use count for \"/dev/%s\" now %d\n",
+	       cdi->name, cdi->use_count);
+	return 0;
+err_release:
+	if (CDROM_CAN(CDC_LOCK) && cdi->options & CDO_LOCK) {
+		cdi->ops->lock_door(cdi, 0);
+		cd_dbg(CD_OPEN, "door unlocked\n");
+	}
+	cdi->ops->release(cdi);
+err:
+	cdi->use_count--;
+	return ret;
+}
+
+/* This code is similar to that in open_for_data. The routine is called
+   whenever an audio play operation is requested.
+*/
+static int check_for_audio_disc(struct cdrom_device_info *cdi,
+				const struct cdrom_device_ops *cdo)
+{
+        int ret;
+	tracktype tracks;
+	cd_dbg(CD_OPEN, "entering check_for_audio_disc\n");
+	if (!(cdi->options & CDO_CHECK_TYPE))
+		return 0;
+	if (cdo->drive_status != NULL) {
+		ret = cdo->drive_status(cdi, CDSL_CURRENT);
+		cd_dbg(CD_OPEN, "drive_status=%d\n", ret);
+		if (ret == CDS_TRAY_OPEN) {
+			cd_dbg(CD_OPEN, "the tray is open...\n");
+			/* can/may i close it? */
+			if (CDROM_CAN(CDC_CLOSE_TRAY) &&
+			    cdi->options & CDO_AUTO_CLOSE) {
+				cd_dbg(CD_OPEN, "trying to close the tray\n");
+				ret=cdo->tray_move(cdi,0);
+				if (ret) {
+					cd_dbg(CD_OPEN, "bummer. tried to close tray but failed.\n");
+					/* Ignore the error from the low
+					level driver.  We don't care why it
+					couldn't close the tray.  We only care 
+					that there is no disc in the drive, 
+					since that is the _REAL_ problem here.*/
+					return -ENOMEDIUM;
+				}
+			} else {
+				cd_dbg(CD_OPEN, "bummer. this driver can't close the tray.\n");
+				return -ENOMEDIUM;
+			}
+			/* Ok, the door should be closed now.. Check again */
+			ret = cdo->drive_status(cdi, CDSL_CURRENT);
+			if ((ret == CDS_NO_DISC) || (ret==CDS_TRAY_OPEN)) {
+				cd_dbg(CD_OPEN, "bummer. the tray is still not closed.\n");
+				return -ENOMEDIUM;
+			}	
+			if (ret!=CDS_DISC_OK) {
+				cd_dbg(CD_OPEN, "bummer. disc isn't ready.\n");
+				return -EIO;
+			}	
+			cd_dbg(CD_OPEN, "the tray is now closed\n");
+		}	
+	}
+	cdrom_count_tracks(cdi, &tracks);
+	if (tracks.error) 
+		return(tracks.error);
+
+	if (tracks.audio==0)
+		return -EMEDIUMTYPE;
+
+	return 0;
+}
+
+void cdrom_release(struct cdrom_device_info *cdi, fmode_t mode)
+{
+	const struct cdrom_device_ops *cdo = cdi->ops;
+	int opened_for_data;
+
+	cd_dbg(CD_CLOSE, "entering cdrom_release\n");
+
+	if (cdi->use_count > 0)
+		cdi->use_count--;
+
+	if (cdi->use_count == 0) {
+		cd_dbg(CD_CLOSE, "Use count for \"/dev/%s\" now zero\n",
+		       cdi->name);
+		cdrom_dvd_rw_close_write(cdi);
+
+		if ((cdo->capability & CDC_LOCK) && !cdi->keeplocked) {
+			cd_dbg(CD_CLOSE, "Unlocking door!\n");
+			cdo->lock_door(cdi, 0);
+		}
+	}
+
+	opened_for_data = !(cdi->options & CDO_USE_FFLAGS) ||
+		!(mode & FMODE_NDELAY);
+
+	/*
+	 * flush cache on last write release
+	 */
+	if (CDROM_CAN(CDC_RAM) && !cdi->use_count && cdi->for_data)
+		cdrom_close_write(cdi);
+
+	cdo->release(cdi);
+	if (cdi->use_count == 0) {      /* last process that closes dev*/
+		if (opened_for_data &&
+		    cdi->options & CDO_AUTO_EJECT && CDROM_CAN(CDC_OPEN_TRAY))
+			cdo->tray_move(cdi, 1);
+	}
+}
+
+static int cdrom_read_mech_status(struct cdrom_device_info *cdi, 
+				  struct cdrom_changer_info *buf)
+{
+	struct packet_command cgc;
+	const struct cdrom_device_ops *cdo = cdi->ops;
+	int length;
+
+	/*
+	 * Sanyo changer isn't spec compliant (doesn't use regular change
+	 * LOAD_UNLOAD command, and it doesn't implement the mech status
+	 * command below
+	 */
+	if (cdi->sanyo_slot) {
+		buf->hdr.nslots = 3;
+		buf->hdr.curslot = cdi->sanyo_slot == 3 ? 0 : cdi->sanyo_slot;
+		for (length = 0; length < 3; length++) {
+			buf->slots[length].disc_present = 1;
+			buf->slots[length].change = 0;
+		}
+		return 0;
+	}
+
+	length = sizeof(struct cdrom_mechstat_header) +
+		 cdi->capacity * sizeof(struct cdrom_slot);
+
+	init_cdrom_command(&cgc, buf, length, CGC_DATA_READ);
+	cgc.cmd[0] = GPCMD_MECHANISM_STATUS;
+	cgc.cmd[8] = (length >> 8) & 0xff;
+	cgc.cmd[9] = length & 0xff;
+	return cdo->generic_packet(cdi, &cgc);
+}
+
+static int cdrom_slot_status(struct cdrom_device_info *cdi, int slot)
+{
+	struct cdrom_changer_info *info;
+	int ret;
+
+	cd_dbg(CD_CHANGER, "entering cdrom_slot_status()\n");
+	if (cdi->sanyo_slot)
+		return CDS_NO_INFO;
+	
+	info = kmalloc(sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	if ((ret = cdrom_read_mech_status(cdi, info)))
+		goto out_free;
+
+	if (info->slots[slot].disc_present)
+		ret = CDS_DISC_OK;
+	else
+		ret = CDS_NO_DISC;
+
+out_free:
+	kfree(info);
+	return ret;
+}
+
+/* Return the number of slots for an ATAPI/SCSI cdrom, 
+ * return 1 if not a changer. 
+ */
+int cdrom_number_of_slots(struct cdrom_device_info *cdi) 
+{
+	int status;
+	int nslots = 1;
+	struct cdrom_changer_info *info;
+
+	cd_dbg(CD_CHANGER, "entering cdrom_number_of_slots()\n");
+	/* cdrom_read_mech_status requires a valid value for capacity: */
+	cdi->capacity = 0; 
+
+	info = kmalloc(sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	if ((status = cdrom_read_mech_status(cdi, info)) == 0)
+		nslots = info->hdr.nslots;
+
+	kfree(info);
+	return nslots;
+}
+
+
+/* If SLOT < 0, unload the current slot.  Otherwise, try to load SLOT. */
+static int cdrom_load_unload(struct cdrom_device_info *cdi, int slot) 
+{
+	struct packet_command cgc;
+
+	cd_dbg(CD_CHANGER, "entering cdrom_load_unload()\n");
+	if (cdi->sanyo_slot && slot < 0)
+		return 0;
+
+	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
+	cgc.cmd[0] = GPCMD_LOAD_UNLOAD;
+	cgc.cmd[4] = 2 + (slot >= 0);
+	cgc.cmd[8] = slot;
+	cgc.timeout = 60 * HZ;
+
+	/* The Sanyo 3 CD changer uses byte 7 of the 
+	GPCMD_TEST_UNIT_READY to command to switch CDs instead of
+	using the GPCMD_LOAD_UNLOAD opcode. */
+	if (cdi->sanyo_slot && -1 < slot) {
+		cgc.cmd[0] = GPCMD_TEST_UNIT_READY;
+		cgc.cmd[7] = slot;
+		cgc.cmd[4] = cgc.cmd[8] = 0;
+		cdi->sanyo_slot = slot ? slot : 3;
+	}
+
+	return cdi->ops->generic_packet(cdi, &cgc);
+}
+
+static int cdrom_select_disc(struct cdrom_device_info *cdi, int slot)
+{
+	struct cdrom_changer_info *info;
+	int curslot;
+	int ret;
+
+	cd_dbg(CD_CHANGER, "entering cdrom_select_disc()\n");
+	if (!CDROM_CAN(CDC_SELECT_DISC))
+		return -EDRIVE_CANT_DO_THIS;
+
+	if (cdi->ops->check_events)
+		cdi->ops->check_events(cdi, 0, slot);
+	else
+		cdi->ops->media_changed(cdi, slot);
+
+	if (slot == CDSL_NONE) {
+		/* set media changed bits, on both queues */
+		cdi->mc_flags = 0x3;
+		return cdrom_load_unload(cdi, -1);
+	}
+
+	info = kmalloc(sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	if ((ret = cdrom_read_mech_status(cdi, info))) {
+		kfree(info);
+		return ret;
+	}
+
+	curslot = info->hdr.curslot;
+	kfree(info);
+
+	if (cdi->use_count > 1 || cdi->keeplocked) {
+		if (slot == CDSL_CURRENT) {
+	    		return curslot;
+		} else {
+			return -EBUSY;
+		}
+	}
+
+	/* Specifying CDSL_CURRENT will attempt to load the currnet slot,
+	which is useful if it had been previously unloaded.
+	Whether it can or not, it returns the current slot. 
+	Similarly,  if slot happens to be the current one, we still
+	try and load it. */
+	if (slot == CDSL_CURRENT)
+		slot = curslot;
+
+	/* set media changed bits on both queues */
+	cdi->mc_flags = 0x3;
+	if ((ret = cdrom_load_unload(cdi, slot)))
+		return ret;
+
+	return slot;
+}
+
+/*
+ * As cdrom implements an extra ioctl consumer for media changed
+ * event, it needs to buffer ->check_events() output, such that event
+ * is not lost for both the usual VFS and ioctl paths.
+ * cdi->{vfs|ioctl}_events are used to buffer pending events for each
+ * path.
+ *
+ * XXX: Locking is non-existent.  cdi->ops->check_events() can be
+ * called in parallel and buffering fields are accessed without any
+ * exclusion.  The original media_changed code had the same problem.
+ * It might be better to simply deprecate CDROM_MEDIA_CHANGED ioctl
+ * and remove this cruft altogether.  It doesn't have much usefulness
+ * at this point.
+ */
+static void cdrom_update_events(struct cdrom_device_info *cdi,
+				unsigned int clearing)
+{
+	unsigned int events;
+
+	events = cdi->ops->check_events(cdi, clearing, CDSL_CURRENT);
+	cdi->vfs_events |= events;
+	cdi->ioctl_events |= events;
+}
+
+unsigned int cdrom_check_events(struct cdrom_device_info *cdi,
+				unsigned int clearing)
+{
+	unsigned int events;
+
+	cdrom_update_events(cdi, clearing);
+	events = cdi->vfs_events;
+	cdi->vfs_events = 0;
+	return events;
+}
+EXPORT_SYMBOL(cdrom_check_events);
+
+/* We want to make media_changed accessible to the user through an
+ * ioctl. The main problem now is that we must double-buffer the
+ * low-level implementation, to assure that the VFS and the user both
+ * see a medium change once.
+ */
+
+static
+int media_changed(struct cdrom_device_info *cdi, int queue)
+{
+	unsigned int mask = (1 << (queue & 1));
+	int ret = !!(cdi->mc_flags & mask);
+	bool changed;
+
+	if (!CDROM_CAN(CDC_MEDIA_CHANGED))
+		return ret;
+
+	/* changed since last call? */
+	if (cdi->ops->check_events) {
+		BUG_ON(!queue);	/* shouldn't be called from VFS path */
+		cdrom_update_events(cdi, DISK_EVENT_MEDIA_CHANGE);
+		changed = cdi->ioctl_events & DISK_EVENT_MEDIA_CHANGE;
+		cdi->ioctl_events = 0;
+	} else
+		changed = cdi->ops->media_changed(cdi, CDSL_CURRENT);
+
+	if (changed) {
+		cdi->mc_flags = 0x3;    /* set bit on both queues */
+		ret |= 1;
+		cdi->media_written = 0;
+	}
+
+	cdi->mc_flags &= ~mask;         /* clear bit */
+	return ret;
+}
+
+int cdrom_media_changed(struct cdrom_device_info *cdi)
+{
+	/* This talks to the VFS, which doesn't like errors - just 1 or 0.  
+	 * Returning "0" is always safe (media hasn't been changed). Do that 
+	 * if the low-level cdrom driver dosn't support media changed. */ 
+	if (cdi == NULL || cdi->ops->media_changed == NULL)
+		return 0;
+	if (!CDROM_CAN(CDC_MEDIA_CHANGED))
+		return 0;
+	return media_changed(cdi, 0);
+}
+
+/* Requests to the low-level drivers will /always/ be done in the
+   following format convention:
+
+   CDROM_LBA: all data-related requests.
+   CDROM_MSF: all audio-related requests.
+
+   However, a low-level implementation is allowed to refuse this
+   request, and return information in its own favorite format.
+
+   It doesn't make sense /at all/ to ask for a play_audio in LBA
+   format, or ask for multi-session info in MSF format. However, for
+   backward compatibility these format requests will be satisfied, but
+   the requests to the low-level drivers will be sanitized in the more
+   meaningful format indicated above.
+ */
+
+static
+void sanitize_format(union cdrom_addr *addr,
+		     u_char * curr, u_char requested)
+{
+	if (*curr == requested)
+		return;                 /* nothing to be done! */
+	if (requested == CDROM_LBA) {
+		addr->lba = (int) addr->msf.frame +
+			75 * (addr->msf.second - 2 + 60 * addr->msf.minute);
+	} else {                        /* CDROM_MSF */
+		int lba = addr->lba;
+		addr->msf.frame = lba % 75;
+		lba /= 75;
+		lba += 2;
+		addr->msf.second = lba % 60;
+		addr->msf.minute = lba / 60;
+	}
+	*curr = requested;
+}
+
+void init_cdrom_command(struct packet_command *cgc, void *buf, int len,
+			int type)
+{
+	memset(cgc, 0, sizeof(struct packet_command));
+	if (buf)
+		memset(buf, 0, len);
+	cgc->buffer = (char *) buf;
+	cgc->buflen = len;
+	cgc->data_direction = type;
+	cgc->timeout = CDROM_DEF_TIMEOUT;
+}
+
+/* DVD handling */
+
+#define copy_key(dest,src)	memcpy((dest), (src), sizeof(dvd_key))
+#define copy_chal(dest,src)	memcpy((dest), (src), sizeof(dvd_challenge))
+
+static void setup_report_key(struct packet_command *cgc, unsigned agid, unsigned type)
+{
+	cgc->cmd[0] = GPCMD_REPORT_KEY;
+	cgc->cmd[10] = type | (agid << 6);
+	switch (type) {
+		case 0: case 8: case 5: {
+			cgc->buflen = 8;
+			break;
+		}
+		case 1: {
+			cgc->buflen = 16;
+			break;
+		}
+		case 2: case 4: {
+			cgc->buflen = 12;
+			break;
+		}
+	}
+	cgc->cmd[9] = cgc->buflen;
+	cgc->data_direction = CGC_DATA_READ;
+}
+
+static void setup_send_key(struct packet_command *cgc, unsigned agid, unsigned type)
+{
+	cgc->cmd[0] = GPCMD_SEND_KEY;
+	cgc->cmd[10] = type | (agid << 6);
+	switch (type) {
+		case 1: {
+			cgc->buflen = 16;
+			break;
+		}
+		case 3: {
+			cgc->buflen = 12;
+			break;
+		}
+		case 6: {
+			cgc->buflen = 8;
+			break;
+		}
+	}
+	cgc->cmd[9] = cgc->buflen;
+	cgc->data_direction = CGC_DATA_WRITE;
+}
+
+static int dvd_do_auth(struct cdrom_device_info *cdi, dvd_authinfo *ai)
+{
+	int ret;
+	u_char buf[20];
+	struct packet_command cgc;
+	const struct cdrom_device_ops *cdo = cdi->ops;
+	rpc_state_t rpc_state;
+
+	memset(buf, 0, sizeof(buf));
+	init_cdrom_command(&cgc, buf, 0, CGC_DATA_READ);
+
+	switch (ai->type) {
+	/* LU data send */
+	case DVD_LU_SEND_AGID:
+		cd_dbg(CD_DVD, "entering DVD_LU_SEND_AGID\n");
+		cgc.quiet = 1;
+		setup_report_key(&cgc, ai->lsa.agid, 0);
+
+		if ((ret = cdo->generic_packet(cdi, &cgc)))
+			return ret;
+
+		ai->lsa.agid = buf[7] >> 6;
+		/* Returning data, let host change state */
+		break;
+
+	case DVD_LU_SEND_KEY1:
+		cd_dbg(CD_DVD, "entering DVD_LU_SEND_KEY1\n");
+		setup_report_key(&cgc, ai->lsk.agid, 2);
+
+		if ((ret = cdo->generic_packet(cdi, &cgc)))
+			return ret;
+
+		copy_key(ai->lsk.key, &buf[4]);
+		/* Returning data, let host change state */
+		break;
+
+	case DVD_LU_SEND_CHALLENGE:
+		cd_dbg(CD_DVD, "entering DVD_LU_SEND_CHALLENGE\n");
+		setup_report_key(&cgc, ai->lsc.agid, 1);
+
+		if ((ret = cdo->generic_packet(cdi, &cgc)))
+			return ret;
+
+		copy_chal(ai->lsc.chal, &buf[4]);
+		/* Returning data, let host change state */
+		break;
+
+	/* Post-auth key */
+	case DVD_LU_SEND_TITLE_KEY:
+		cd_dbg(CD_DVD, "entering DVD_LU_SEND_TITLE_KEY\n");
+		cgc.quiet = 1;
+		setup_report_key(&cgc, ai->lstk.agid, 4);
+		cgc.cmd[5] = ai->lstk.lba;
+		cgc.cmd[4] = ai->lstk.lba >> 8;
+		cgc.cmd[3] = ai->lstk.lba >> 16;
+		cgc.cmd[2] = ai->lstk.lba >> 24;
+
+		if ((ret = cdo->generic_packet(cdi, &cgc)))
+			return ret;
+
+		ai->lstk.cpm = (buf[4] >> 7) & 1;
+		ai->lstk.cp_sec = (buf[4] >> 6) & 1;
+		ai->lstk.cgms = (buf[4] >> 4) & 3;
+		copy_key(ai->lstk.title_key, &buf[5]);
+		/* Returning data, let host change state */
+		break;
+
+	case DVD_LU_SEND_ASF:
+		cd_dbg(CD_DVD, "entering DVD_LU_SEND_ASF\n");
+		setup_report_key(&cgc, ai->lsasf.agid, 5);
+		
+		if ((ret = cdo->generic_packet(cdi, &cgc)))
+			return ret;
+
+		ai->lsasf.asf = buf[7] & 1;
+		break;
+
+	/* LU data receive (LU changes state) */
+	case DVD_HOST_SEND_CHALLENGE:
+		cd_dbg(CD_DVD, "entering DVD_HOST_SEND_CHALLENGE\n");
+		setup_send_key(&cgc, ai->hsc.agid, 1);
+		buf[1] = 0xe;
+		copy_chal(&buf[4], ai->hsc.chal);
+
+		if ((ret = cdo->generic_packet(cdi, &cgc)))
+			return ret;
+
+		ai->type = DVD_LU_SEND_KEY1;
+		break;
+
+	case DVD_HOST_SEND_KEY2:
+		cd_dbg(CD_DVD, "entering DVD_HOST_SEND_KEY2\n");
+		setup_send_key(&cgc, ai->hsk.agid, 3);
+		buf[1] = 0xa;
+		copy_key(&buf[4], ai->hsk.key);
+
+		if ((ret = cdo->generic_packet(cdi, &cgc))) {
+			ai->type = DVD_AUTH_FAILURE;
+			return ret;
+		}
+		ai->type = DVD_AUTH_ESTABLISHED;
+		break;
+
+	/* Misc */
+	case DVD_INVALIDATE_AGID:
+		cgc.quiet = 1;
+		cd_dbg(CD_DVD, "entering DVD_INVALIDATE_AGID\n");
+		setup_report_key(&cgc, ai->lsa.agid, 0x3f);
+		if ((ret = cdo->generic_packet(cdi, &cgc)))
+			return ret;
+		break;
+
+	/* Get region settings */
+	case DVD_LU_SEND_RPC_STATE:
+		cd_dbg(CD_DVD, "entering DVD_LU_SEND_RPC_STATE\n");
+		setup_report_key(&cgc, 0, 8);
+		memset(&rpc_state, 0, sizeof(rpc_state_t));
+		cgc.buffer = (char *) &rpc_state;
+
+		if ((ret = cdo->generic_packet(cdi, &cgc)))
+			return ret;
+
+		ai->lrpcs.type = rpc_state.type_code;
+		ai->lrpcs.vra = rpc_state.vra;
+		ai->lrpcs.ucca = rpc_state.ucca;
+		ai->lrpcs.region_mask = rpc_state.region_mask;
+		ai->lrpcs.rpc_scheme = rpc_state.rpc_scheme;
+		break;
+
+	/* Set region settings */
+	case DVD_HOST_SEND_RPC_STATE:
+		cd_dbg(CD_DVD, "entering DVD_HOST_SEND_RPC_STATE\n");
+		setup_send_key(&cgc, 0, 6);
+		buf[1] = 6;
+		buf[4] = ai->hrpcs.pdrc;
+
+		if ((ret = cdo->generic_packet(cdi, &cgc)))
+			return ret;
+		break;
+
+	default:
+		cd_dbg(CD_WARNING, "Invalid DVD key ioctl (%d)\n", ai->type);
+		return -ENOTTY;
+	}
+
+	return 0;
+}
+
+static int dvd_read_physical(struct cdrom_device_info *cdi, dvd_struct *s,
+				struct packet_command *cgc)
+{
+	unsigned char buf[21], *base;
+	struct dvd_layer *layer;
+	const struct cdrom_device_ops *cdo = cdi->ops;
+	int ret, layer_num = s->physical.layer_num;
+
+	if (layer_num >= DVD_LAYERS)
+		return -EINVAL;
+
+	init_cdrom_command(cgc, buf, sizeof(buf), CGC_DATA_READ);
+	cgc->cmd[0] = GPCMD_READ_DVD_STRUCTURE;
+	cgc->cmd[6] = layer_num;
+	cgc->cmd[7] = s->type;
+	cgc->cmd[9] = cgc->buflen & 0xff;
+
+	/*
+	 * refrain from reporting errors on non-existing layers (mainly)
+	 */
+	cgc->quiet = 1;
+
+	ret = cdo->generic_packet(cdi, cgc);
+	if (ret)
+		return ret;
+
+	base = &buf[4];
+	layer = &s->physical.layer[layer_num];
+
+	/*
+	 * place the data... really ugly, but at least we won't have to
+	 * worry about endianess in userspace.
+	 */
+	memset(layer, 0, sizeof(*layer));
+	layer->book_version = base[0] & 0xf;
+	layer->book_type = base[0] >> 4;
+	layer->min_rate = base[1] & 0xf;
+	layer->disc_size = base[1] >> 4;
+	layer->layer_type = base[2] & 0xf;
+	layer->track_path = (base[2] >> 4) & 1;
+	layer->nlayers = (base[2] >> 5) & 3;
+	layer->track_density = base[3] & 0xf;
+	layer->linear_density = base[3] >> 4;
+	layer->start_sector = base[5] << 16 | base[6] << 8 | base[7];
+	layer->end_sector = base[9] << 16 | base[10] << 8 | base[11];
+	layer->end_sector_l0 = base[13] << 16 | base[14] << 8 | base[15];
+	layer->bca = base[16] >> 7;
+
+	return 0;
+}
+
+static int dvd_read_copyright(struct cdrom_device_info *cdi, dvd_struct *s,
+				struct packet_command *cgc)
+{
+	int ret;
+	u_char buf[8];
+	const struct cdrom_device_ops *cdo = cdi->ops;
+
+	init_cdrom_command(cgc, buf, sizeof(buf), CGC_DATA_READ);
+	cgc->cmd[0] = GPCMD_READ_DVD_STRUCTURE;
+	cgc->cmd[6] = s->copyright.layer_num;
+	cgc->cmd[7] = s->type;
+	cgc->cmd[8] = cgc->buflen >> 8;
+	cgc->cmd[9] = cgc->buflen & 0xff;
+
+	ret = cdo->generic_packet(cdi, cgc);
+	if (ret)
+		return ret;
+
+	s->copyright.cpst = buf[4];
+	s->copyright.rmi = buf[5];
+
+	return 0;
+}
+
+static int dvd_read_disckey(struct cdrom_device_info *cdi, dvd_struct *s,
+				struct packet_command *cgc)
+{
+	int ret, size;
+	u_char *buf;
+	const struct cdrom_device_ops *cdo = cdi->ops;
+
+	size = sizeof(s->disckey.value) + 4;
+
+	buf = kmalloc(size, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	init_cdrom_command(cgc, buf, size, CGC_DATA_READ);
+	cgc->cmd[0] = GPCMD_READ_DVD_STRUCTURE;
+	cgc->cmd[7] = s->type;
+	cgc->cmd[8] = size >> 8;
+	cgc->cmd[9] = size & 0xff;
+	cgc->cmd[10] = s->disckey.agid << 6;
+
+	ret = cdo->generic_packet(cdi, cgc);
+	if (!ret)
+		memcpy(s->disckey.value, &buf[4], sizeof(s->disckey.value));
+
+	kfree(buf);
+	return ret;
+}
+
+static int dvd_read_bca(struct cdrom_device_info *cdi, dvd_struct *s,
+			struct packet_command *cgc)
+{
+	int ret, size = 4 + 188;
+	u_char *buf;
+	const struct cdrom_device_ops *cdo = cdi->ops;
+
+	buf = kmalloc(size, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	init_cdrom_command(cgc, buf, size, CGC_DATA_READ);
+	cgc->cmd[0] = GPCMD_READ_DVD_STRUCTURE;
+	cgc->cmd[7] = s->type;
+	cgc->cmd[9] = cgc->buflen & 0xff;
+
+	ret = cdo->generic_packet(cdi, cgc);
+	if (ret)
+		goto out;
+
+	s->bca.len = buf[0] << 8 | buf[1];
+	if (s->bca.len < 12 || s->bca.len > 188) {
+		cd_dbg(CD_WARNING, "Received invalid BCA length (%d)\n",
+		       s->bca.len);
+		ret = -EIO;
+		goto out;
+	}
+	memcpy(s->bca.value, &buf[4], s->bca.len);
+	ret = 0;
+out:
+	kfree(buf);
+	return ret;
+}
+
+static int dvd_read_manufact(struct cdrom_device_info *cdi, dvd_struct *s,
+				struct packet_command *cgc)
+{
+	int ret = 0, size;
+	u_char *buf;
+	const struct cdrom_device_ops *cdo = cdi->ops;
+
+	size = sizeof(s->manufact.value) + 4;
+
+	buf = kmalloc(size, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	init_cdrom_command(cgc, buf, size, CGC_DATA_READ);
+	cgc->cmd[0] = GPCMD_READ_DVD_STRUCTURE;
+	cgc->cmd[7] = s->type;
+	cgc->cmd[8] = size >> 8;
+	cgc->cmd[9] = size & 0xff;
+
+	ret = cdo->generic_packet(cdi, cgc);
+	if (ret)
+		goto out;
+
+	s->manufact.len = buf[0] << 8 | buf[1];
+	if (s->manufact.len < 0) {
+		cd_dbg(CD_WARNING, "Received invalid manufacture info length (%d)\n",
+		       s->manufact.len);
+		ret = -EIO;
+	} else {
+		if (s->manufact.len > 2048) {
+			cd_dbg(CD_WARNING, "Received invalid manufacture info length (%d): truncating to 2048\n",
+			       s->manufact.len);
+			s->manufact.len = 2048;
+		}
+		memcpy(s->manufact.value, &buf[4], s->manufact.len);
+	}
+
+out:
+	kfree(buf);
+	return ret;
+}
+
+static int dvd_read_struct(struct cdrom_device_info *cdi, dvd_struct *s,
+				struct packet_command *cgc)
+{
+	switch (s->type) {
+	case DVD_STRUCT_PHYSICAL:
+		return dvd_read_physical(cdi, s, cgc);
+
+	case DVD_STRUCT_COPYRIGHT:
+		return dvd_read_copyright(cdi, s, cgc);
+
+	case DVD_STRUCT_DISCKEY:
+		return dvd_read_disckey(cdi, s, cgc);
+
+	case DVD_STRUCT_BCA:
+		return dvd_read_bca(cdi, s, cgc);
+
+	case DVD_STRUCT_MANUFACT:
+		return dvd_read_manufact(cdi, s, cgc);
+		
+	default:
+		cd_dbg(CD_WARNING, ": Invalid DVD structure read requested (%d)\n",
+		       s->type);
+		return -EINVAL;
+	}
+}
+
+int cdrom_mode_sense(struct cdrom_device_info *cdi,
+		     struct packet_command *cgc,
+		     int page_code, int page_control)
+{
+	const struct cdrom_device_ops *cdo = cdi->ops;
+
+	memset(cgc->cmd, 0, sizeof(cgc->cmd));
+
+	cgc->cmd[0] = GPCMD_MODE_SENSE_10;
+	cgc->cmd[2] = page_code | (page_control << 6);
+	cgc->cmd[7] = cgc->buflen >> 8;
+	cgc->cmd[8] = cgc->buflen & 0xff;
+	cgc->data_direction = CGC_DATA_READ;
+	return cdo->generic_packet(cdi, cgc);
+}
+
+int cdrom_mode_select(struct cdrom_device_info *cdi,
+		      struct packet_command *cgc)
+{
+	const struct cdrom_device_ops *cdo = cdi->ops;
+
+	memset(cgc->cmd, 0, sizeof(cgc->cmd));
+	memset(cgc->buffer, 0, 2);
+	cgc->cmd[0] = GPCMD_MODE_SELECT_10;
+	cgc->cmd[1] = 0x10;		/* PF */
+	cgc->cmd[7] = cgc->buflen >> 8;
+	cgc->cmd[8] = cgc->buflen & 0xff;
+	cgc->data_direction = CGC_DATA_WRITE;
+	return cdo->generic_packet(cdi, cgc);
+}
+
+static int cdrom_read_subchannel(struct cdrom_device_info *cdi,
+				 struct cdrom_subchnl *subchnl, int mcn)
+{
+	const struct cdrom_device_ops *cdo = cdi->ops;
+	struct packet_command cgc;
+	char buffer[32];
+	int ret;
+
+	init_cdrom_command(&cgc, buffer, 16, CGC_DATA_READ);
+	cgc.cmd[0] = GPCMD_READ_SUBCHANNEL;
+	cgc.cmd[1] = subchnl->cdsc_format;/* MSF or LBA addressing */
+	cgc.cmd[2] = 0x40;  /* request subQ data */
+	cgc.cmd[3] = mcn ? 2 : 1;
+	cgc.cmd[8] = 16;
+
+	if ((ret = cdo->generic_packet(cdi, &cgc)))
+		return ret;
+
+	subchnl->cdsc_audiostatus = cgc.buffer[1];
+	subchnl->cdsc_ctrl = cgc.buffer[5] & 0xf;
+	subchnl->cdsc_trk = cgc.buffer[6];
+	subchnl->cdsc_ind = cgc.buffer[7];
+
+	if (subchnl->cdsc_format == CDROM_LBA) {
+		subchnl->cdsc_absaddr.lba = ((cgc.buffer[8] << 24) |
+						(cgc.buffer[9] << 16) |
+						(cgc.buffer[10] << 8) |
+						(cgc.buffer[11]));
+		subchnl->cdsc_reladdr.lba = ((cgc.buffer[12] << 24) |
+						(cgc.buffer[13] << 16) |
+						(cgc.buffer[14] << 8) |
+						(cgc.buffer[15]));
+	} else {
+		subchnl->cdsc_reladdr.msf.minute = cgc.buffer[13];
+		subchnl->cdsc_reladdr.msf.second = cgc.buffer[14];
+		subchnl->cdsc_reladdr.msf.frame = cgc.buffer[15];
+		subchnl->cdsc_absaddr.msf.minute = cgc.buffer[9];
+		subchnl->cdsc_absaddr.msf.second = cgc.buffer[10];
+		subchnl->cdsc_absaddr.msf.frame = cgc.buffer[11];
+	}
+
+	return 0;
+}
+
+/*
+ * Specific READ_10 interface
+ */
+static int cdrom_read_cd(struct cdrom_device_info *cdi,
+			 struct packet_command *cgc, int lba,
+			 int blocksize, int nblocks)
+{
+	const struct cdrom_device_ops *cdo = cdi->ops;
+
+	memset(&cgc->cmd, 0, sizeof(cgc->cmd));
+	cgc->cmd[0] = GPCMD_READ_10;
+	cgc->cmd[2] = (lba >> 24) & 0xff;
+	cgc->cmd[3] = (lba >> 16) & 0xff;
+	cgc->cmd[4] = (lba >>  8) & 0xff;
+	cgc->cmd[5] = lba & 0xff;
+	cgc->cmd[6] = (nblocks >> 16) & 0xff;
+	cgc->cmd[7] = (nblocks >>  8) & 0xff;
+	cgc->cmd[8] = nblocks & 0xff;
+	cgc->buflen = blocksize * nblocks;
+	return cdo->generic_packet(cdi, cgc);
+}
+
+/* very generic interface for reading the various types of blocks */
+static int cdrom_read_block(struct cdrom_device_info *cdi,
+			    struct packet_command *cgc,
+			    int lba, int nblocks, int format, int blksize)
+{
+	const struct cdrom_device_ops *cdo = cdi->ops;
+
+	memset(&cgc->cmd, 0, sizeof(cgc->cmd));
+	cgc->cmd[0] = GPCMD_READ_CD;
+	/* expected sector size - cdda,mode1,etc. */
+	cgc->cmd[1] = format << 2;
+	/* starting address */
+	cgc->cmd[2] = (lba >> 24) & 0xff;
+	cgc->cmd[3] = (lba >> 16) & 0xff;
+	cgc->cmd[4] = (lba >>  8) & 0xff;
+	cgc->cmd[5] = lba & 0xff;
+	/* number of blocks */
+	cgc->cmd[6] = (nblocks >> 16) & 0xff;
+	cgc->cmd[7] = (nblocks >>  8) & 0xff;
+	cgc->cmd[8] = nblocks & 0xff;
+	cgc->buflen = blksize * nblocks;
+	
+	/* set the header info returned */
+	switch (blksize) {
+	case CD_FRAMESIZE_RAW0	: cgc->cmd[9] = 0x58; break;
+	case CD_FRAMESIZE_RAW1	: cgc->cmd[9] = 0x78; break;
+	case CD_FRAMESIZE_RAW	: cgc->cmd[9] = 0xf8; break;
+	default			: cgc->cmd[9] = 0x10;
+	}
+	
+	return cdo->generic_packet(cdi, cgc);
+}
+
+static int cdrom_read_cdda_old(struct cdrom_device_info *cdi, __u8 __user *ubuf,
+			       int lba, int nframes)
+{
+	struct packet_command cgc;
+	int ret = 0;
+	int nr;
+
+	cdi->last_sense = 0;
+
+	memset(&cgc, 0, sizeof(cgc));
+
+	/*
+	 * start with will ra.nframes size, back down if alloc fails
+	 */
+	nr = nframes;
+	do {
+		cgc.buffer = kmalloc_array(nr, CD_FRAMESIZE_RAW, GFP_KERNEL);
+		if (cgc.buffer)
+			break;
+
+		nr >>= 1;
+	} while (nr);
+
+	if (!nr)
+		return -ENOMEM;
+
+	cgc.data_direction = CGC_DATA_READ;
+	while (nframes > 0) {
+		if (nr > nframes)
+			nr = nframes;
+
+		ret = cdrom_read_block(cdi, &cgc, lba, nr, 1, CD_FRAMESIZE_RAW);
+		if (ret)
+			break;
+		if (copy_to_user(ubuf, cgc.buffer, CD_FRAMESIZE_RAW * nr)) {
+			ret = -EFAULT;
+			break;
+		}
+		ubuf += CD_FRAMESIZE_RAW * nr;
+		nframes -= nr;
+		lba += nr;
+	}
+	kfree(cgc.buffer);
+	return ret;
+}
+
+static int cdrom_read_cdda_bpc(struct cdrom_device_info *cdi, __u8 __user *ubuf,
+			       int lba, int nframes)
+{
+	struct request_queue *q = cdi->disk->queue;
+	struct request *rq;
+	struct scsi_request *req;
+	struct bio *bio;
+	unsigned int len;
+	int nr, ret = 0;
+
+	if (!q)
+		return -ENXIO;
+
+	if (!blk_queue_scsi_passthrough(q)) {
+		WARN_ONCE(true,
+			  "Attempt read CDDA info through a non-SCSI queue\n");
+		return -EINVAL;
+	}
+
+	cdi->last_sense = 0;
+
+	while (nframes) {
+		nr = nframes;
+		if (cdi->cdda_method == CDDA_BPC_SINGLE)
+			nr = 1;
+		if (nr * CD_FRAMESIZE_RAW > (queue_max_sectors(q) << 9))
+			nr = (queue_max_sectors(q) << 9) / CD_FRAMESIZE_RAW;
+
+		len = nr * CD_FRAMESIZE_RAW;
+
+		rq = blk_get_request(q, REQ_OP_SCSI_IN, 0);
+		if (IS_ERR(rq)) {
+			ret = PTR_ERR(rq);
+			break;
+		}
+		req = scsi_req(rq);
+
+		ret = blk_rq_map_user(q, rq, NULL, ubuf, len, GFP_KERNEL);
+		if (ret) {
+			blk_put_request(rq);
+			break;
+		}
+
+		req->cmd[0] = GPCMD_READ_CD;
+		req->cmd[1] = 1 << 2;
+		req->cmd[2] = (lba >> 24) & 0xff;
+		req->cmd[3] = (lba >> 16) & 0xff;
+		req->cmd[4] = (lba >>  8) & 0xff;
+		req->cmd[5] = lba & 0xff;
+		req->cmd[6] = (nr >> 16) & 0xff;
+		req->cmd[7] = (nr >>  8) & 0xff;
+		req->cmd[8] = nr & 0xff;
+		req->cmd[9] = 0xf8;
+
+		req->cmd_len = 12;
+		rq->timeout = 60 * HZ;
+		bio = rq->bio;
+
+		blk_execute_rq(q, cdi->disk, rq, 0);
+		if (scsi_req(rq)->result) {
+			struct scsi_sense_hdr sshdr;
+
+			ret = -EIO;
+			scsi_normalize_sense(req->sense, req->sense_len,
+					     &sshdr);
+			cdi->last_sense = sshdr.sense_key;
+		}
+
+		if (blk_rq_unmap_user(bio))
+			ret = -EFAULT;
+		blk_put_request(rq);
+
+		if (ret)
+			break;
+
+		nframes -= nr;
+		lba += nr;
+		ubuf += len;
+	}
+
+	return ret;
+}
+
+static int cdrom_read_cdda(struct cdrom_device_info *cdi, __u8 __user *ubuf,
+			   int lba, int nframes)
+{
+	int ret;
+
+	if (cdi->cdda_method == CDDA_OLD)
+		return cdrom_read_cdda_old(cdi, ubuf, lba, nframes);
+
+retry:
+	/*
+	 * for anything else than success and io error, we need to retry
+	 */
+	ret = cdrom_read_cdda_bpc(cdi, ubuf, lba, nframes);
+	if (!ret || ret != -EIO)
+		return ret;
+
+	/*
+	 * I've seen drives get sense 4/8/3 udma crc errors on multi
+	 * frame dma, so drop to single frame dma if we need to
+	 */
+	if (cdi->cdda_method == CDDA_BPC_FULL && nframes > 1) {
+		pr_info("dropping to single frame dma\n");
+		cdi->cdda_method = CDDA_BPC_SINGLE;
+		goto retry;
+	}
+
+	/*
+	 * so we have an io error of some sort with multi frame dma. if the
+	 * condition wasn't a hardware error
+	 * problems, not for any error
+	 */
+	if (cdi->last_sense != 0x04 && cdi->last_sense != 0x0b)
+		return ret;
+
+	pr_info("dropping to old style cdda (sense=%x)\n", cdi->last_sense);
+	cdi->cdda_method = CDDA_OLD;
+	return cdrom_read_cdda_old(cdi, ubuf, lba, nframes);	
+}
+
+static int cdrom_ioctl_multisession(struct cdrom_device_info *cdi,
+		void __user *argp)
+{
+	struct cdrom_multisession ms_info;
+	u8 requested_format;
+	int ret;
+
+	cd_dbg(CD_DO_IOCTL, "entering CDROMMULTISESSION\n");
+
+	if (!(cdi->ops->capability & CDC_MULTI_SESSION))
+		return -ENOSYS;
+
+	if (copy_from_user(&ms_info, argp, sizeof(ms_info)))
+		return -EFAULT;
+
+	requested_format = ms_info.addr_format;
+	if (requested_format != CDROM_MSF && requested_format != CDROM_LBA)
+		return -EINVAL;
+	ms_info.addr_format = CDROM_LBA;
+
+	ret = cdi->ops->get_last_session(cdi, &ms_info);
+	if (ret)
+		return ret;
+
+	sanitize_format(&ms_info.addr, &ms_info.addr_format, requested_format);
+
+	if (copy_to_user(argp, &ms_info, sizeof(ms_info)))
+		return -EFAULT;
+
+	cd_dbg(CD_DO_IOCTL, "CDROMMULTISESSION successful\n");
+	return 0;
+}
+
+static int cdrom_ioctl_eject(struct cdrom_device_info *cdi)
+{
+	cd_dbg(CD_DO_IOCTL, "entering CDROMEJECT\n");
+
+	if (!CDROM_CAN(CDC_OPEN_TRAY))
+		return -ENOSYS;
+	if (cdi->use_count != 1 || cdi->keeplocked)
+		return -EBUSY;
+	if (CDROM_CAN(CDC_LOCK)) {
+		int ret = cdi->ops->lock_door(cdi, 0);
+		if (ret)
+			return ret;
+	}
+
+	return cdi->ops->tray_move(cdi, 1);
+}
+
+static int cdrom_ioctl_closetray(struct cdrom_device_info *cdi)
+{
+	cd_dbg(CD_DO_IOCTL, "entering CDROMCLOSETRAY\n");
+
+	if (!CDROM_CAN(CDC_CLOSE_TRAY))
+		return -ENOSYS;
+	return cdi->ops->tray_move(cdi, 0);
+}
+
+static int cdrom_ioctl_eject_sw(struct cdrom_device_info *cdi,
+		unsigned long arg)
+{
+	cd_dbg(CD_DO_IOCTL, "entering CDROMEJECT_SW\n");
+
+	if (!CDROM_CAN(CDC_OPEN_TRAY))
+		return -ENOSYS;
+	if (cdi->keeplocked)
+		return -EBUSY;
+
+	cdi->options &= ~(CDO_AUTO_CLOSE | CDO_AUTO_EJECT);
+	if (arg)
+		cdi->options |= CDO_AUTO_CLOSE | CDO_AUTO_EJECT;
+	return 0;
+}
+
+static int cdrom_ioctl_media_changed(struct cdrom_device_info *cdi,
+		unsigned long arg)
+{
+	struct cdrom_changer_info *info;
+	int ret;
+
+	cd_dbg(CD_DO_IOCTL, "entering CDROM_MEDIA_CHANGED\n");
+
+	if (!CDROM_CAN(CDC_MEDIA_CHANGED))
+		return -ENOSYS;
+
+	/* cannot select disc or select current disc */
+	if (!CDROM_CAN(CDC_SELECT_DISC) || arg == CDSL_CURRENT)
+		return media_changed(cdi, 1);
+
+	if (arg >= cdi->capacity)
+		return -EINVAL;
+
+	info = kmalloc(sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	ret = cdrom_read_mech_status(cdi, info);
+	if (!ret)
+		ret = info->slots[arg].change;
+	kfree(info);
+	return ret;
+}
+
+static int cdrom_ioctl_set_options(struct cdrom_device_info *cdi,
+		unsigned long arg)
+{
+	cd_dbg(CD_DO_IOCTL, "entering CDROM_SET_OPTIONS\n");
+
+	/*
+	 * Options need to be in sync with capability.
+	 * Too late for that, so we have to check each one separately.
+	 */
+	switch (arg) {
+	case CDO_USE_FFLAGS:
+	case CDO_CHECK_TYPE:
+		break;
+	case CDO_LOCK:
+		if (!CDROM_CAN(CDC_LOCK))
+			return -ENOSYS;
+		break;
+	case 0:
+		return cdi->options;
+	/* default is basically CDO_[AUTO_CLOSE|AUTO_EJECT] */
+	default:
+		if (!CDROM_CAN(arg))
+			return -ENOSYS;
+	}
+	cdi->options |= (int) arg;
+	return cdi->options;
+}
+
+static int cdrom_ioctl_clear_options(struct cdrom_device_info *cdi,
+		unsigned long arg)
+{
+	cd_dbg(CD_DO_IOCTL, "entering CDROM_CLEAR_OPTIONS\n");
+
+	cdi->options &= ~(int) arg;
+	return cdi->options;
+}
+
+static int cdrom_ioctl_select_speed(struct cdrom_device_info *cdi,
+		unsigned long arg)
+{
+	cd_dbg(CD_DO_IOCTL, "entering CDROM_SELECT_SPEED\n");
+
+	if (!CDROM_CAN(CDC_SELECT_SPEED))
+		return -ENOSYS;
+	return cdi->ops->select_speed(cdi, arg);
+}
+
+static int cdrom_ioctl_select_disc(struct cdrom_device_info *cdi,
+		unsigned long arg)
+{
+	cd_dbg(CD_DO_IOCTL, "entering CDROM_SELECT_DISC\n");
+
+	if (!CDROM_CAN(CDC_SELECT_DISC))
+		return -ENOSYS;
+
+	if (arg != CDSL_CURRENT && arg != CDSL_NONE) {
+		if (arg >= cdi->capacity)
+			return -EINVAL;
+	}
+
+	/*
+	 * ->select_disc is a hook to allow a driver-specific way of
+	 * seleting disc.  However, since there is no equivalent hook for
+	 * cdrom_slot_status this may not actually be useful...
+	 */
+	if (cdi->ops->select_disc)
+		return cdi->ops->select_disc(cdi, arg);
+
+	cd_dbg(CD_CHANGER, "Using generic cdrom_select_disc()\n");
+	return cdrom_select_disc(cdi, arg);
+}
+
+static int cdrom_ioctl_reset(struct cdrom_device_info *cdi,
+		struct block_device *bdev)
+{
+	cd_dbg(CD_DO_IOCTL, "entering CDROM_RESET\n");
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+	if (!CDROM_CAN(CDC_RESET))
+		return -ENOSYS;
+	invalidate_bdev(bdev);
+	return cdi->ops->reset(cdi);
+}
+
+static int cdrom_ioctl_lock_door(struct cdrom_device_info *cdi,
+		unsigned long arg)
+{
+	cd_dbg(CD_DO_IOCTL, "%socking door\n", arg ? "L" : "Unl");
+
+	if (!CDROM_CAN(CDC_LOCK))
+		return -EDRIVE_CANT_DO_THIS;
+
+	cdi->keeplocked = arg ? 1 : 0;
+
+	/*
+	 * Don't unlock the door on multiple opens by default, but allow
+	 * root to do so.
+	 */
+	if (cdi->use_count != 1 && !arg && !capable(CAP_SYS_ADMIN))
+		return -EBUSY;
+	return cdi->ops->lock_door(cdi, arg);
+}
+
+static int cdrom_ioctl_debug(struct cdrom_device_info *cdi,
+		unsigned long arg)
+{
+	cd_dbg(CD_DO_IOCTL, "%sabling debug\n", arg ? "En" : "Dis");
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+	debug = arg ? 1 : 0;
+	return debug;
+}
+
+static int cdrom_ioctl_get_capability(struct cdrom_device_info *cdi)
+{
+	cd_dbg(CD_DO_IOCTL, "entering CDROM_GET_CAPABILITY\n");
+	return (cdi->ops->capability & ~cdi->mask);
+}
+
+/*
+ * The following function is implemented, although very few audio
+ * discs give Universal Product Code information, which should just be
+ * the Medium Catalog Number on the box.  Note, that the way the code
+ * is written on the CD is /not/ uniform across all discs!
+ */
+static int cdrom_ioctl_get_mcn(struct cdrom_device_info *cdi,
+		void __user *argp)
+{
+	struct cdrom_mcn mcn;
+	int ret;
+
+	cd_dbg(CD_DO_IOCTL, "entering CDROM_GET_MCN\n");
+
+	if (!(cdi->ops->capability & CDC_MCN))
+		return -ENOSYS;
+	ret = cdi->ops->get_mcn(cdi, &mcn);
+	if (ret)
+		return ret;
+
+	if (copy_to_user(argp, &mcn, sizeof(mcn)))
+		return -EFAULT;
+	cd_dbg(CD_DO_IOCTL, "CDROM_GET_MCN successful\n");
+	return 0;
+}
+
+static int cdrom_ioctl_drive_status(struct cdrom_device_info *cdi,
+		unsigned long arg)
+{
+	cd_dbg(CD_DO_IOCTL, "entering CDROM_DRIVE_STATUS\n");
+
+	if (!(cdi->ops->capability & CDC_DRIVE_STATUS))
+		return -ENOSYS;
+	if (!CDROM_CAN(CDC_SELECT_DISC) ||
+	    (arg == CDSL_CURRENT || arg == CDSL_NONE))
+		return cdi->ops->drive_status(cdi, CDSL_CURRENT);
+	if (arg >= cdi->capacity)
+		return -EINVAL;
+	return cdrom_slot_status(cdi, arg);
+}
+
+/*
+ * Ok, this is where problems start.  The current interface for the
+ * CDROM_DISC_STATUS ioctl is flawed.  It makes the false assumption that
+ * CDs are all CDS_DATA_1 or all CDS_AUDIO, etc.  Unfortunately, while this
+ * is often the case, it is also very common for CDs to have some tracks
+ * with data, and some tracks with audio.  Just because I feel like it,
+ * I declare the following to be the best way to cope.  If the CD has ANY
+ * data tracks on it, it will be returned as a data CD.  If it has any XA
+ * tracks, I will return it as that.  Now I could simplify this interface
+ * by combining these  returns with the above, but this more clearly
+ * demonstrates the problem with the current interface.  Too bad this
+ * wasn't designed to use bitmasks...         -Erik
+ *
+ * Well, now we have the option CDS_MIXED: a mixed-type CD.
+ * User level programmers might feel the ioctl is not very useful.
+ *					---david
+ */
+static int cdrom_ioctl_disc_status(struct cdrom_device_info *cdi)
+{
+	tracktype tracks;
+
+	cd_dbg(CD_DO_IOCTL, "entering CDROM_DISC_STATUS\n");
+
+	cdrom_count_tracks(cdi, &tracks);
+	if (tracks.error)
+		return tracks.error;
+
+	/* Policy mode on */
+	if (tracks.audio > 0) {
+		if (!tracks.data && !tracks.cdi && !tracks.xa)
+			return CDS_AUDIO;
+		else
+			return CDS_MIXED;
+	}
+
+	if (tracks.cdi > 0)
+		return CDS_XA_2_2;
+	if (tracks.xa > 0)
+		return CDS_XA_2_1;
+	if (tracks.data > 0)
+		return CDS_DATA_1;
+	/* Policy mode off */
+
+	cd_dbg(CD_WARNING, "This disc doesn't have any tracks I recognize!\n");
+	return CDS_NO_INFO;
+}
+
+static int cdrom_ioctl_changer_nslots(struct cdrom_device_info *cdi)
+{
+	cd_dbg(CD_DO_IOCTL, "entering CDROM_CHANGER_NSLOTS\n");
+	return cdi->capacity;
+}
+
+static int cdrom_ioctl_get_subchnl(struct cdrom_device_info *cdi,
+		void __user *argp)
+{
+	struct cdrom_subchnl q;
+	u8 requested, back;
+	int ret;
+
+	/* cd_dbg(CD_DO_IOCTL,"entering CDROMSUBCHNL\n");*/
+
+	if (copy_from_user(&q, argp, sizeof(q)))
+		return -EFAULT;
+
+	requested = q.cdsc_format;
+	if (requested != CDROM_MSF && requested != CDROM_LBA)
+		return -EINVAL;
+	q.cdsc_format = CDROM_MSF;
+
+	ret = cdi->ops->audio_ioctl(cdi, CDROMSUBCHNL, &q);
+	if (ret)
+		return ret;
+
+	back = q.cdsc_format; /* local copy */
+	sanitize_format(&q.cdsc_absaddr, &back, requested);
+	sanitize_format(&q.cdsc_reladdr, &q.cdsc_format, requested);
+
+	if (copy_to_user(argp, &q, sizeof(q)))
+		return -EFAULT;
+	/* cd_dbg(CD_DO_IOCTL, "CDROMSUBCHNL successful\n"); */
+	return 0;
+}
+
+static int cdrom_ioctl_read_tochdr(struct cdrom_device_info *cdi,
+		void __user *argp)
+{
+	struct cdrom_tochdr header;
+	int ret;
+
+	/* cd_dbg(CD_DO_IOCTL, "entering CDROMREADTOCHDR\n"); */
+
+	if (copy_from_user(&header, argp, sizeof(header)))
+		return -EFAULT;
+
+	ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCHDR, &header);
+	if (ret)
+		return ret;
+
+	if (copy_to_user(argp, &header, sizeof(header)))
+		return -EFAULT;
+	/* cd_dbg(CD_DO_IOCTL, "CDROMREADTOCHDR successful\n"); */
+	return 0;
+}
+
+static int cdrom_ioctl_read_tocentry(struct cdrom_device_info *cdi,
+		void __user *argp)
+{
+	struct cdrom_tocentry entry;
+	u8 requested_format;
+	int ret;
+
+	/* cd_dbg(CD_DO_IOCTL, "entering CDROMREADTOCENTRY\n"); */
+
+	if (copy_from_user(&entry, argp, sizeof(entry)))
+		return -EFAULT;
+
+	requested_format = entry.cdte_format;
+	if (requested_format != CDROM_MSF && requested_format != CDROM_LBA)
+		return -EINVAL;
+	/* make interface to low-level uniform */
+	entry.cdte_format = CDROM_MSF;
+	ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCENTRY, &entry);
+	if (ret)
+		return ret;
+	sanitize_format(&entry.cdte_addr, &entry.cdte_format, requested_format);
+
+	if (copy_to_user(argp, &entry, sizeof(entry)))
+		return -EFAULT;
+	/* cd_dbg(CD_DO_IOCTL, "CDROMREADTOCENTRY successful\n"); */
+	return 0;
+}
+
+static int cdrom_ioctl_play_msf(struct cdrom_device_info *cdi,
+		void __user *argp)
+{
+	struct cdrom_msf msf;
+
+	cd_dbg(CD_DO_IOCTL, "entering CDROMPLAYMSF\n");
+
+	if (!CDROM_CAN(CDC_PLAY_AUDIO))
+		return -ENOSYS;
+	if (copy_from_user(&msf, argp, sizeof(msf)))
+		return -EFAULT;
+	return cdi->ops->audio_ioctl(cdi, CDROMPLAYMSF, &msf);
+}
+
+static int cdrom_ioctl_play_trkind(struct cdrom_device_info *cdi,
+		void __user *argp)
+{
+	struct cdrom_ti ti;
+	int ret;
+
+	cd_dbg(CD_DO_IOCTL, "entering CDROMPLAYTRKIND\n");
+
+	if (!CDROM_CAN(CDC_PLAY_AUDIO))
+		return -ENOSYS;
+	if (copy_from_user(&ti, argp, sizeof(ti)))
+		return -EFAULT;
+
+	ret = check_for_audio_disc(cdi, cdi->ops);
+	if (ret)
+		return ret;
+	return cdi->ops->audio_ioctl(cdi, CDROMPLAYTRKIND, &ti);
+}
+static int cdrom_ioctl_volctrl(struct cdrom_device_info *cdi,
+		void __user *argp)
+{
+	struct cdrom_volctrl volume;
+
+	cd_dbg(CD_DO_IOCTL, "entering CDROMVOLCTRL\n");
+
+	if (!CDROM_CAN(CDC_PLAY_AUDIO))
+		return -ENOSYS;
+	if (copy_from_user(&volume, argp, sizeof(volume)))
+		return -EFAULT;
+	return cdi->ops->audio_ioctl(cdi, CDROMVOLCTRL, &volume);
+}
+
+static int cdrom_ioctl_volread(struct cdrom_device_info *cdi,
+		void __user *argp)
+{
+	struct cdrom_volctrl volume;
+	int ret;
+
+	cd_dbg(CD_DO_IOCTL, "entering CDROMVOLREAD\n");
+
+	if (!CDROM_CAN(CDC_PLAY_AUDIO))
+		return -ENOSYS;
+
+	ret = cdi->ops->audio_ioctl(cdi, CDROMVOLREAD, &volume);
+	if (ret)
+		return ret;
+
+	if (copy_to_user(argp, &volume, sizeof(volume)))
+		return -EFAULT;
+	return 0;
+}
+
+static int cdrom_ioctl_audioctl(struct cdrom_device_info *cdi,
+		unsigned int cmd)
+{
+	int ret;
+
+	cd_dbg(CD_DO_IOCTL, "doing audio ioctl (start/stop/pause/resume)\n");
+
+	if (!CDROM_CAN(CDC_PLAY_AUDIO))
+		return -ENOSYS;
+	ret = check_for_audio_disc(cdi, cdi->ops);
+	if (ret)
+		return ret;
+	return cdi->ops->audio_ioctl(cdi, cmd, NULL);
+}
+
+/*
+ * Required when we need to use READ_10 to issue other than 2048 block
+ * reads
+ */
+static int cdrom_switch_blocksize(struct cdrom_device_info *cdi, int size)
+{
+	const struct cdrom_device_ops *cdo = cdi->ops;
+	struct packet_command cgc;
+	struct modesel_head mh;
+
+	memset(&mh, 0, sizeof(mh));
+	mh.block_desc_length = 0x08;
+	mh.block_length_med = (size >> 8) & 0xff;
+	mh.block_length_lo = size & 0xff;
+
+	memset(&cgc, 0, sizeof(cgc));
+	cgc.cmd[0] = 0x15;
+	cgc.cmd[1] = 1 << 4;
+	cgc.cmd[4] = 12;
+	cgc.buflen = sizeof(mh);
+	cgc.buffer = (char *) &mh;
+	cgc.data_direction = CGC_DATA_WRITE;
+	mh.block_desc_length = 0x08;
+	mh.block_length_med = (size >> 8) & 0xff;
+	mh.block_length_lo = size & 0xff;
+
+	return cdo->generic_packet(cdi, &cgc);
+}
+
+static int cdrom_get_track_info(struct cdrom_device_info *cdi,
+				__u16 track, __u8 type, track_information *ti)
+{
+	const struct cdrom_device_ops *cdo = cdi->ops;
+	struct packet_command cgc;
+	int ret, buflen;
+
+	init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
+	cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
+	cgc.cmd[1] = type & 3;
+	cgc.cmd[4] = (track & 0xff00) >> 8;
+	cgc.cmd[5] = track & 0xff;
+	cgc.cmd[8] = 8;
+	cgc.quiet = 1;
+
+	ret = cdo->generic_packet(cdi, &cgc);
+	if (ret)
+		return ret;
+
+	buflen = be16_to_cpu(ti->track_information_length) +
+		sizeof(ti->track_information_length);
+
+	if (buflen > sizeof(track_information))
+		buflen = sizeof(track_information);
+
+	cgc.cmd[8] = cgc.buflen = buflen;
+	ret = cdo->generic_packet(cdi, &cgc);
+	if (ret)
+		return ret;
+
+	/* return actual fill size */
+	return buflen;
+}
+
+/* return the last written block on the CD-R media. this is for the udf
+   file system. */
+int cdrom_get_last_written(struct cdrom_device_info *cdi, long *last_written)
+{
+	struct cdrom_tocentry toc;
+	disc_information di;
+	track_information ti;
+	__u32 last_track;
+	int ret = -1, ti_size;
+
+	if (!CDROM_CAN(CDC_GENERIC_PACKET))
+		goto use_toc;
+
+	ret = cdrom_get_disc_info(cdi, &di);
+	if (ret < (int)(offsetof(typeof(di), last_track_lsb)
+			+ sizeof(di.last_track_lsb)))
+		goto use_toc;
+
+	/* if unit didn't return msb, it's zeroed by cdrom_get_disc_info */
+	last_track = (di.last_track_msb << 8) | di.last_track_lsb;
+	ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
+	if (ti_size < (int)offsetof(typeof(ti), track_start))
+		goto use_toc;
+
+	/* if this track is blank, try the previous. */
+	if (ti.blank) {
+		if (last_track == 1)
+			goto use_toc;
+		last_track--;
+		ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
+	}
+
+	if (ti_size < (int)(offsetof(typeof(ti), track_size)
+				+ sizeof(ti.track_size)))
+		goto use_toc;
+
+	/* if last recorded field is valid, return it. */
+	if (ti.lra_v && ti_size >= (int)(offsetof(typeof(ti), last_rec_address)
+				+ sizeof(ti.last_rec_address))) {
+		*last_written = be32_to_cpu(ti.last_rec_address);
+	} else {
+		/* make it up instead */
+		*last_written = be32_to_cpu(ti.track_start) +
+				be32_to_cpu(ti.track_size);
+		if (ti.free_blocks)
+			*last_written -= (be32_to_cpu(ti.free_blocks) + 7);
+	}
+	return 0;
+
+	/* this is where we end up if the drive either can't do a
+	   GPCMD_READ_DISC_INFO or GPCMD_READ_TRACK_RZONE_INFO or if
+	   it doesn't give enough information or fails. then we return
+	   the toc contents. */
+use_toc:
+	if (!CDROM_CAN(CDC_PLAY_AUDIO))
+		return -ENOSYS;
+
+	toc.cdte_format = CDROM_MSF;
+	toc.cdte_track = CDROM_LEADOUT;
+	if ((ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCENTRY, &toc)))
+		return ret;
+	sanitize_format(&toc.cdte_addr, &toc.cdte_format, CDROM_LBA);
+	*last_written = toc.cdte_addr.lba;
+	return 0;
+}
+
+/* return the next writable block. also for udf file system. */
+static int cdrom_get_next_writable(struct cdrom_device_info *cdi,
+				   long *next_writable)
+{
+	disc_information di;
+	track_information ti;
+	__u16 last_track;
+	int ret, ti_size;
+
+	if (!CDROM_CAN(CDC_GENERIC_PACKET))
+		goto use_last_written;
+
+	ret = cdrom_get_disc_info(cdi, &di);
+	if (ret < 0 || ret < offsetof(typeof(di), last_track_lsb)
+				+ sizeof(di.last_track_lsb))
+		goto use_last_written;
+
+	/* if unit didn't return msb, it's zeroed by cdrom_get_disc_info */
+	last_track = (di.last_track_msb << 8) | di.last_track_lsb;
+	ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
+	if (ti_size < 0 || ti_size < offsetof(typeof(ti), track_start))
+		goto use_last_written;
+
+	/* if this track is blank, try the previous. */
+	if (ti.blank) {
+		if (last_track == 1)
+			goto use_last_written;
+		last_track--;
+		ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
+		if (ti_size < 0)
+			goto use_last_written;
+	}
+
+	/* if next recordable address field is valid, use it. */
+	if (ti.nwa_v && ti_size >= offsetof(typeof(ti), next_writable)
+				+ sizeof(ti.next_writable)) {
+		*next_writable = be32_to_cpu(ti.next_writable);
+		return 0;
+	}
+
+use_last_written:
+	ret = cdrom_get_last_written(cdi, next_writable);
+	if (ret) {
+		*next_writable = 0;
+		return ret;
+	} else {
+		*next_writable += 7;
+		return 0;
+	}
+}
+
+static noinline int mmc_ioctl_cdrom_read_data(struct cdrom_device_info *cdi,
+					      void __user *arg,
+					      struct packet_command *cgc,
+					      int cmd)
+{
+	struct scsi_sense_hdr sshdr;
+	struct cdrom_msf msf;
+	int blocksize = 0, format = 0, lba;
+	int ret;
+
+	switch (cmd) {
+	case CDROMREADRAW:
+		blocksize = CD_FRAMESIZE_RAW;
+		break;
+	case CDROMREADMODE1:
+		blocksize = CD_FRAMESIZE;
+		format = 2;
+		break;
+	case CDROMREADMODE2:
+		blocksize = CD_FRAMESIZE_RAW0;
+		break;
+	}
+	if (copy_from_user(&msf, (struct cdrom_msf __user *)arg, sizeof(msf)))
+		return -EFAULT;
+	lba = msf_to_lba(msf.cdmsf_min0, msf.cdmsf_sec0, msf.cdmsf_frame0);
+	/* FIXME: we need upper bound checking, too!! */
+	if (lba < 0)
+		return -EINVAL;
+
+	cgc->buffer = kzalloc(blocksize, GFP_KERNEL);
+	if (cgc->buffer == NULL)
+		return -ENOMEM;
+
+	memset(&sshdr, 0, sizeof(sshdr));
+	cgc->sshdr = &sshdr;
+	cgc->data_direction = CGC_DATA_READ;
+	ret = cdrom_read_block(cdi, cgc, lba, 1, format, blocksize);
+	if (ret && sshdr.sense_key == 0x05 &&
+	    sshdr.asc == 0x20 &&
+	    sshdr.ascq == 0x00) {
+		/*
+		 * SCSI-II devices are not required to support
+		 * READ_CD, so let's try switching block size
+		 */
+		/* FIXME: switch back again... */
+		ret = cdrom_switch_blocksize(cdi, blocksize);
+		if (ret)
+			goto out;
+		cgc->sshdr = NULL;
+		ret = cdrom_read_cd(cdi, cgc, lba, blocksize, 1);
+		ret |= cdrom_switch_blocksize(cdi, blocksize);
+	}
+	if (!ret && copy_to_user(arg, cgc->buffer, blocksize))
+		ret = -EFAULT;
+out:
+	kfree(cgc->buffer);
+	return ret;
+}
+
+static noinline int mmc_ioctl_cdrom_read_audio(struct cdrom_device_info *cdi,
+					       void __user *arg)
+{
+	struct cdrom_read_audio ra;
+	int lba;
+
+	if (copy_from_user(&ra, (struct cdrom_read_audio __user *)arg,
+			   sizeof(ra)))
+		return -EFAULT;
+
+	if (ra.addr_format == CDROM_MSF)
+		lba = msf_to_lba(ra.addr.msf.minute,
+				 ra.addr.msf.second,
+				 ra.addr.msf.frame);
+	else if (ra.addr_format == CDROM_LBA)
+		lba = ra.addr.lba;
+	else
+		return -EINVAL;
+
+	/* FIXME: we need upper bound checking, too!! */
+	if (lba < 0 || ra.nframes <= 0 || ra.nframes > CD_FRAMES)
+		return -EINVAL;
+
+	return cdrom_read_cdda(cdi, ra.buf, lba, ra.nframes);
+}
+
+static noinline int mmc_ioctl_cdrom_subchannel(struct cdrom_device_info *cdi,
+					       void __user *arg)
+{
+	int ret;
+	struct cdrom_subchnl q;
+	u_char requested, back;
+	if (copy_from_user(&q, (struct cdrom_subchnl __user *)arg, sizeof(q)))
+		return -EFAULT;
+	requested = q.cdsc_format;
+	if (!((requested == CDROM_MSF) ||
+	      (requested == CDROM_LBA)))
+		return -EINVAL;
+
+	ret = cdrom_read_subchannel(cdi, &q, 0);
+	if (ret)
+		return ret;
+	back = q.cdsc_format; /* local copy */
+	sanitize_format(&q.cdsc_absaddr, &back, requested);
+	sanitize_format(&q.cdsc_reladdr, &q.cdsc_format, requested);
+	if (copy_to_user((struct cdrom_subchnl __user *)arg, &q, sizeof(q)))
+		return -EFAULT;
+	/* cd_dbg(CD_DO_IOCTL, "CDROMSUBCHNL successful\n"); */
+	return 0;
+}
+
+static noinline int mmc_ioctl_cdrom_play_msf(struct cdrom_device_info *cdi,
+					     void __user *arg,
+					     struct packet_command *cgc)
+{
+	const struct cdrom_device_ops *cdo = cdi->ops;
+	struct cdrom_msf msf;
+	cd_dbg(CD_DO_IOCTL, "entering CDROMPLAYMSF\n");
+	if (copy_from_user(&msf, (struct cdrom_msf __user *)arg, sizeof(msf)))
+		return -EFAULT;
+	cgc->cmd[0] = GPCMD_PLAY_AUDIO_MSF;
+	cgc->cmd[3] = msf.cdmsf_min0;
+	cgc->cmd[4] = msf.cdmsf_sec0;
+	cgc->cmd[5] = msf.cdmsf_frame0;
+	cgc->cmd[6] = msf.cdmsf_min1;
+	cgc->cmd[7] = msf.cdmsf_sec1;
+	cgc->cmd[8] = msf.cdmsf_frame1;
+	cgc->data_direction = CGC_DATA_NONE;
+	return cdo->generic_packet(cdi, cgc);
+}
+
+static noinline int mmc_ioctl_cdrom_play_blk(struct cdrom_device_info *cdi,
+					     void __user *arg,
+					     struct packet_command *cgc)
+{
+	const struct cdrom_device_ops *cdo = cdi->ops;
+	struct cdrom_blk blk;
+	cd_dbg(CD_DO_IOCTL, "entering CDROMPLAYBLK\n");
+	if (copy_from_user(&blk, (struct cdrom_blk __user *)arg, sizeof(blk)))
+		return -EFAULT;
+	cgc->cmd[0] = GPCMD_PLAY_AUDIO_10;
+	cgc->cmd[2] = (blk.from >> 24) & 0xff;
+	cgc->cmd[3] = (blk.from >> 16) & 0xff;
+	cgc->cmd[4] = (blk.from >>  8) & 0xff;
+	cgc->cmd[5] = blk.from & 0xff;
+	cgc->cmd[7] = (blk.len >> 8) & 0xff;
+	cgc->cmd[8] = blk.len & 0xff;
+	cgc->data_direction = CGC_DATA_NONE;
+	return cdo->generic_packet(cdi, cgc);
+}
+
+static noinline int mmc_ioctl_cdrom_volume(struct cdrom_device_info *cdi,
+					   void __user *arg,
+					   struct packet_command *cgc,
+					   unsigned int cmd)
+{
+	struct cdrom_volctrl volctrl;
+	unsigned char buffer[32];
+	char mask[sizeof(buffer)];
+	unsigned short offset;
+	int ret;
+
+	cd_dbg(CD_DO_IOCTL, "entering CDROMVOLUME\n");
+
+	if (copy_from_user(&volctrl, (struct cdrom_volctrl __user *)arg,
+			   sizeof(volctrl)))
+		return -EFAULT;
+
+	cgc->buffer = buffer;
+	cgc->buflen = 24;
+	ret = cdrom_mode_sense(cdi, cgc, GPMODE_AUDIO_CTL_PAGE, 0);
+	if (ret)
+		return ret;
+		
+	/* originally the code depended on buffer[1] to determine
+	   how much data is available for transfer. buffer[1] is
+	   unfortunately ambigious and the only reliable way seem
+	   to be to simply skip over the block descriptor... */
+	offset = 8 + be16_to_cpu(*(__be16 *)(buffer + 6));
+
+	if (offset + 16 > sizeof(buffer))
+		return -E2BIG;
+
+	if (offset + 16 > cgc->buflen) {
+		cgc->buflen = offset + 16;
+		ret = cdrom_mode_sense(cdi, cgc,
+				       GPMODE_AUDIO_CTL_PAGE, 0);
+		if (ret)
+			return ret;
+	}
+
+	/* sanity check */
+	if ((buffer[offset] & 0x3f) != GPMODE_AUDIO_CTL_PAGE ||
+	    buffer[offset + 1] < 14)
+		return -EINVAL;
+
+	/* now we have the current volume settings. if it was only
+	   a CDROMVOLREAD, return these values */
+	if (cmd == CDROMVOLREAD) {
+		volctrl.channel0 = buffer[offset+9];
+		volctrl.channel1 = buffer[offset+11];
+		volctrl.channel2 = buffer[offset+13];
+		volctrl.channel3 = buffer[offset+15];
+		if (copy_to_user((struct cdrom_volctrl __user *)arg, &volctrl,
+				 sizeof(volctrl)))
+			return -EFAULT;
+		return 0;
+	}
+		
+	/* get the volume mask */
+	cgc->buffer = mask;
+	ret = cdrom_mode_sense(cdi, cgc, GPMODE_AUDIO_CTL_PAGE, 1);
+	if (ret)
+		return ret;
+
+	buffer[offset + 9]  = volctrl.channel0 & mask[offset + 9];
+	buffer[offset + 11] = volctrl.channel1 & mask[offset + 11];
+	buffer[offset + 13] = volctrl.channel2 & mask[offset + 13];
+	buffer[offset + 15] = volctrl.channel3 & mask[offset + 15];
+
+	/* set volume */
+	cgc->buffer = buffer + offset - 8;
+	memset(cgc->buffer, 0, 8);
+	return cdrom_mode_select(cdi, cgc);
+}
+
+static noinline int mmc_ioctl_cdrom_start_stop(struct cdrom_device_info *cdi,
+					       struct packet_command *cgc,
+					       int cmd)
+{
+	const struct cdrom_device_ops *cdo = cdi->ops;
+	cd_dbg(CD_DO_IOCTL, "entering CDROMSTART/CDROMSTOP\n");
+	cgc->cmd[0] = GPCMD_START_STOP_UNIT;
+	cgc->cmd[1] = 1;
+	cgc->cmd[4] = (cmd == CDROMSTART) ? 1 : 0;
+	cgc->data_direction = CGC_DATA_NONE;
+	return cdo->generic_packet(cdi, cgc);
+}
+
+static noinline int mmc_ioctl_cdrom_pause_resume(struct cdrom_device_info *cdi,
+						 struct packet_command *cgc,
+						 int cmd)
+{
+	const struct cdrom_device_ops *cdo = cdi->ops;
+	cd_dbg(CD_DO_IOCTL, "entering CDROMPAUSE/CDROMRESUME\n");
+	cgc->cmd[0] = GPCMD_PAUSE_RESUME;
+	cgc->cmd[8] = (cmd == CDROMRESUME) ? 1 : 0;
+	cgc->data_direction = CGC_DATA_NONE;
+	return cdo->generic_packet(cdi, cgc);
+}
+
+static noinline int mmc_ioctl_dvd_read_struct(struct cdrom_device_info *cdi,
+					      void __user *arg,
+					      struct packet_command *cgc)
+{
+	int ret;
+	dvd_struct *s;
+	int size = sizeof(dvd_struct);
+
+	if (!CDROM_CAN(CDC_DVD))
+		return -ENOSYS;
+
+	s = memdup_user(arg, size);
+	if (IS_ERR(s))
+		return PTR_ERR(s);
+
+	cd_dbg(CD_DO_IOCTL, "entering DVD_READ_STRUCT\n");
+
+	ret = dvd_read_struct(cdi, s, cgc);
+	if (ret)
+		goto out;
+
+	if (copy_to_user(arg, s, size))
+		ret = -EFAULT;
+out:
+	kfree(s);
+	return ret;
+}
+
+static noinline int mmc_ioctl_dvd_auth(struct cdrom_device_info *cdi,
+				       void __user *arg)
+{
+	int ret;
+	dvd_authinfo ai;
+	if (!CDROM_CAN(CDC_DVD))
+		return -ENOSYS;
+	cd_dbg(CD_DO_IOCTL, "entering DVD_AUTH\n");
+	if (copy_from_user(&ai, (dvd_authinfo __user *)arg, sizeof(ai)))
+		return -EFAULT;
+	ret = dvd_do_auth(cdi, &ai);
+	if (ret)
+		return ret;
+	if (copy_to_user((dvd_authinfo __user *)arg, &ai, sizeof(ai)))
+		return -EFAULT;
+	return 0;
+}
+
+static noinline int mmc_ioctl_cdrom_next_writable(struct cdrom_device_info *cdi,
+						  void __user *arg)
+{
+	int ret;
+	long next = 0;
+	cd_dbg(CD_DO_IOCTL, "entering CDROM_NEXT_WRITABLE\n");
+	ret = cdrom_get_next_writable(cdi, &next);
+	if (ret)
+		return ret;
+	if (copy_to_user((long __user *)arg, &next, sizeof(next)))
+		return -EFAULT;
+	return 0;
+}
+
+static noinline int mmc_ioctl_cdrom_last_written(struct cdrom_device_info *cdi,
+						 void __user *arg)
+{
+	int ret;
+	long last = 0;
+	cd_dbg(CD_DO_IOCTL, "entering CDROM_LAST_WRITTEN\n");
+	ret = cdrom_get_last_written(cdi, &last);
+	if (ret)
+		return ret;
+	if (copy_to_user((long __user *)arg, &last, sizeof(last)))
+		return -EFAULT;
+	return 0;
+}
+
+static int mmc_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
+		     unsigned long arg)
+{
+	struct packet_command cgc;
+	void __user *userptr = (void __user *)arg;
+
+	memset(&cgc, 0, sizeof(cgc));
+
+	/* build a unified command and queue it through
+	   cdo->generic_packet() */
+	switch (cmd) {
+	case CDROMREADRAW:
+	case CDROMREADMODE1:
+	case CDROMREADMODE2:
+		return mmc_ioctl_cdrom_read_data(cdi, userptr, &cgc, cmd);
+	case CDROMREADAUDIO:
+		return mmc_ioctl_cdrom_read_audio(cdi, userptr);
+	case CDROMSUBCHNL:
+		return mmc_ioctl_cdrom_subchannel(cdi, userptr);
+	case CDROMPLAYMSF:
+		return mmc_ioctl_cdrom_play_msf(cdi, userptr, &cgc);
+	case CDROMPLAYBLK:
+		return mmc_ioctl_cdrom_play_blk(cdi, userptr, &cgc);
+	case CDROMVOLCTRL:
+	case CDROMVOLREAD:
+		return mmc_ioctl_cdrom_volume(cdi, userptr, &cgc, cmd);
+	case CDROMSTART:
+	case CDROMSTOP:
+		return mmc_ioctl_cdrom_start_stop(cdi, &cgc, cmd);
+	case CDROMPAUSE:
+	case CDROMRESUME:
+		return mmc_ioctl_cdrom_pause_resume(cdi, &cgc, cmd);
+	case DVD_READ_STRUCT:
+		return mmc_ioctl_dvd_read_struct(cdi, userptr, &cgc);
+	case DVD_AUTH:
+		return mmc_ioctl_dvd_auth(cdi, userptr);
+	case CDROM_NEXT_WRITABLE:
+		return mmc_ioctl_cdrom_next_writable(cdi, userptr);
+	case CDROM_LAST_WRITTEN:
+		return mmc_ioctl_cdrom_last_written(cdi, userptr);
+	}
+
+	return -ENOTTY;
+}
+
+/*
+ * Just about every imaginable ioctl is supported in the Uniform layer
+ * these days.
+ * ATAPI / SCSI specific code now mainly resides in mmc_ioctl().
+ */
+int cdrom_ioctl(struct cdrom_device_info *cdi, struct block_device *bdev,
+		fmode_t mode, unsigned int cmd, unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	int ret;
+
+	/*
+	 * Try the generic SCSI command ioctl's first.
+	 */
+	ret = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
+	if (ret != -ENOTTY)
+		return ret;
+
+	switch (cmd) {
+	case CDROMMULTISESSION:
+		return cdrom_ioctl_multisession(cdi, argp);
+	case CDROMEJECT:
+		return cdrom_ioctl_eject(cdi);
+	case CDROMCLOSETRAY:
+		return cdrom_ioctl_closetray(cdi);
+	case CDROMEJECT_SW:
+		return cdrom_ioctl_eject_sw(cdi, arg);
+	case CDROM_MEDIA_CHANGED:
+		return cdrom_ioctl_media_changed(cdi, arg);
+	case CDROM_SET_OPTIONS:
+		return cdrom_ioctl_set_options(cdi, arg);
+	case CDROM_CLEAR_OPTIONS:
+		return cdrom_ioctl_clear_options(cdi, arg);
+	case CDROM_SELECT_SPEED:
+		return cdrom_ioctl_select_speed(cdi, arg);
+	case CDROM_SELECT_DISC:
+		return cdrom_ioctl_select_disc(cdi, arg);
+	case CDROMRESET:
+		return cdrom_ioctl_reset(cdi, bdev);
+	case CDROM_LOCKDOOR:
+		return cdrom_ioctl_lock_door(cdi, arg);
+	case CDROM_DEBUG:
+		return cdrom_ioctl_debug(cdi, arg);
+	case CDROM_GET_CAPABILITY:
+		return cdrom_ioctl_get_capability(cdi);
+	case CDROM_GET_MCN:
+		return cdrom_ioctl_get_mcn(cdi, argp);
+	case CDROM_DRIVE_STATUS:
+		return cdrom_ioctl_drive_status(cdi, arg);
+	case CDROM_DISC_STATUS:
+		return cdrom_ioctl_disc_status(cdi);
+	case CDROM_CHANGER_NSLOTS:
+		return cdrom_ioctl_changer_nslots(cdi);
+	}
+
+	/*
+	 * Use the ioctls that are implemented through the generic_packet()
+	 * interface. this may look at bit funny, but if -ENOTTY is
+	 * returned that particular ioctl is not implemented and we
+	 * let it go through the device specific ones.
+	 */
+	if (CDROM_CAN(CDC_GENERIC_PACKET)) {
+		ret = mmc_ioctl(cdi, cmd, arg);
+		if (ret != -ENOTTY)
+			return ret;
+	}
+
+	/*
+	 * Note: most of the cd_dbg() calls are commented out here,
+	 * because they fill up the sys log when CD players poll
+	 * the drive.
+	 */
+	switch (cmd) {
+	case CDROMSUBCHNL:
+		return cdrom_ioctl_get_subchnl(cdi, argp);
+	case CDROMREADTOCHDR:
+		return cdrom_ioctl_read_tochdr(cdi, argp);
+	case CDROMREADTOCENTRY:
+		return cdrom_ioctl_read_tocentry(cdi, argp);
+	case CDROMPLAYMSF:
+		return cdrom_ioctl_play_msf(cdi, argp);
+	case CDROMPLAYTRKIND:
+		return cdrom_ioctl_play_trkind(cdi, argp);
+	case CDROMVOLCTRL:
+		return cdrom_ioctl_volctrl(cdi, argp);
+	case CDROMVOLREAD:
+		return cdrom_ioctl_volread(cdi, argp);
+	case CDROMSTART:
+	case CDROMSTOP:
+	case CDROMPAUSE:
+	case CDROMRESUME:
+		return cdrom_ioctl_audioctl(cdi, cmd);
+	}
+
+	return -ENOSYS;
+}
+
+EXPORT_SYMBOL(cdrom_get_last_written);
+EXPORT_SYMBOL(register_cdrom);
+EXPORT_SYMBOL(unregister_cdrom);
+EXPORT_SYMBOL(cdrom_open);
+EXPORT_SYMBOL(cdrom_release);
+EXPORT_SYMBOL(cdrom_ioctl);
+EXPORT_SYMBOL(cdrom_media_changed);
+EXPORT_SYMBOL(cdrom_number_of_slots);
+EXPORT_SYMBOL(cdrom_mode_select);
+EXPORT_SYMBOL(cdrom_mode_sense);
+EXPORT_SYMBOL(init_cdrom_command);
+EXPORT_SYMBOL(cdrom_get_media_event);
+
+#ifdef CONFIG_SYSCTL
+
+#define CDROM_STR_SIZE 1000
+
+static struct cdrom_sysctl_settings {
+	char	info[CDROM_STR_SIZE];	/* general info */
+	int	autoclose;		/* close tray upon mount, etc */
+	int	autoeject;		/* eject on umount */
+	int	debug;			/* turn on debugging messages */
+	int	lock;			/* lock the door on device open */
+	int	check;			/* check media type */
+} cdrom_sysctl_settings;
+
+enum cdrom_print_option {
+	CTL_NAME,
+	CTL_SPEED,
+	CTL_SLOTS,
+	CTL_CAPABILITY
+};
+
+static int cdrom_print_info(const char *header, int val, char *info,
+				int *pos, enum cdrom_print_option option)
+{
+	const int max_size = sizeof(cdrom_sysctl_settings.info);
+	struct cdrom_device_info *cdi;
+	int ret;
+
+	ret = scnprintf(info + *pos, max_size - *pos, header);
+	if (!ret)
+		return 1;
+
+	*pos += ret;
+
+	list_for_each_entry(cdi, &cdrom_list, list) {
+		switch (option) {
+		case CTL_NAME:
+			ret = scnprintf(info + *pos, max_size - *pos,
+					"\t%s", cdi->name);
+			break;
+		case CTL_SPEED:
+			ret = scnprintf(info + *pos, max_size - *pos,
+					"\t%d", cdi->speed);
+			break;
+		case CTL_SLOTS:
+			ret = scnprintf(info + *pos, max_size - *pos,
+					"\t%d", cdi->capacity);
+			break;
+		case CTL_CAPABILITY:
+			ret = scnprintf(info + *pos, max_size - *pos,
+					"\t%d", CDROM_CAN(val) != 0);
+			break;
+		default:
+			pr_info("invalid option%d\n", option);
+			return 1;
+		}
+		if (!ret)
+			return 1;
+		*pos += ret;
+	}
+
+	return 0;
+}
+
+static int cdrom_sysctl_info(struct ctl_table *ctl, int write,
+                           void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	int pos;
+	char *info = cdrom_sysctl_settings.info;
+	const int max_size = sizeof(cdrom_sysctl_settings.info);
+	
+	if (!*lenp || (*ppos && !write)) {
+		*lenp = 0;
+		return 0;
+	}
+
+	mutex_lock(&cdrom_mutex);
+
+	pos = sprintf(info, "CD-ROM information, " VERSION "\n");
+	
+	if (cdrom_print_info("\ndrive name:\t", 0, info, &pos, CTL_NAME))
+		goto done;
+	if (cdrom_print_info("\ndrive speed:\t", 0, info, &pos, CTL_SPEED))
+		goto done;
+	if (cdrom_print_info("\ndrive # of slots:", 0, info, &pos, CTL_SLOTS))
+		goto done;
+	if (cdrom_print_info("\nCan close tray:\t",
+				CDC_CLOSE_TRAY, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan open tray:\t",
+				CDC_OPEN_TRAY, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan lock tray:\t",
+				CDC_LOCK, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan change speed:",
+				CDC_SELECT_SPEED, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan select disk:",
+				CDC_SELECT_DISC, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan read multisession:",
+				CDC_MULTI_SESSION, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan read MCN:\t",
+				CDC_MCN, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nReports media changed:",
+				CDC_MEDIA_CHANGED, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan play audio:\t",
+				CDC_PLAY_AUDIO, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan write CD-R:\t",
+				CDC_CD_R, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan write CD-RW:",
+				CDC_CD_RW, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan read DVD:\t",
+				CDC_DVD, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan write DVD-R:",
+				CDC_DVD_R, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan write DVD-RAM:",
+				CDC_DVD_RAM, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan read MRW:\t",
+				CDC_MRW, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan write MRW:\t",
+				CDC_MRW_W, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (cdrom_print_info("\nCan write RAM:\t",
+				CDC_RAM, info, &pos, CTL_CAPABILITY))
+		goto done;
+	if (!scnprintf(info + pos, max_size - pos, "\n\n"))
+		goto done;
+doit:
+	mutex_unlock(&cdrom_mutex);
+	return proc_dostring(ctl, write, buffer, lenp, ppos);
+done:
+	pr_info("info buffer too small\n");
+	goto doit;
+}
+
+/* Unfortunately, per device settings are not implemented through
+   procfs/sysctl yet. When they are, this will naturally disappear. For now
+   just update all drives. Later this will become the template on which
+   new registered drives will be based. */
+static void cdrom_update_settings(void)
+{
+	struct cdrom_device_info *cdi;
+
+	mutex_lock(&cdrom_mutex);
+	list_for_each_entry(cdi, &cdrom_list, list) {
+		if (autoclose && CDROM_CAN(CDC_CLOSE_TRAY))
+			cdi->options |= CDO_AUTO_CLOSE;
+		else if (!autoclose)
+			cdi->options &= ~CDO_AUTO_CLOSE;
+		if (autoeject && CDROM_CAN(CDC_OPEN_TRAY))
+			cdi->options |= CDO_AUTO_EJECT;
+		else if (!autoeject)
+			cdi->options &= ~CDO_AUTO_EJECT;
+		if (lockdoor && CDROM_CAN(CDC_LOCK))
+			cdi->options |= CDO_LOCK;
+		else if (!lockdoor)
+			cdi->options &= ~CDO_LOCK;
+		if (check_media_type)
+			cdi->options |= CDO_CHECK_TYPE;
+		else
+			cdi->options &= ~CDO_CHECK_TYPE;
+	}
+	mutex_unlock(&cdrom_mutex);
+}
+
+static int cdrom_sysctl_handler(struct ctl_table *ctl, int write,
+				void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	int ret;
+	
+	ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
+
+	if (write) {
+	
+		/* we only care for 1 or 0. */
+		autoclose        = !!cdrom_sysctl_settings.autoclose;
+		autoeject        = !!cdrom_sysctl_settings.autoeject;
+		debug	         = !!cdrom_sysctl_settings.debug;
+		lockdoor         = !!cdrom_sysctl_settings.lock;
+		check_media_type = !!cdrom_sysctl_settings.check;
+
+		/* update the option flags according to the changes. we
+		   don't have per device options through sysctl yet,
+		   but we will have and then this will disappear. */
+		cdrom_update_settings();
+	}
+
+        return ret;
+}
+
+/* Place files in /proc/sys/dev/cdrom */
+static struct ctl_table cdrom_table[] = {
+	{
+		.procname	= "info",
+		.data		= &cdrom_sysctl_settings.info, 
+		.maxlen		= CDROM_STR_SIZE,
+		.mode		= 0444,
+		.proc_handler	= cdrom_sysctl_info,
+	},
+	{
+		.procname	= "autoclose",
+		.data		= &cdrom_sysctl_settings.autoclose,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= cdrom_sysctl_handler,
+	},
+	{
+		.procname	= "autoeject",
+		.data		= &cdrom_sysctl_settings.autoeject,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= cdrom_sysctl_handler,
+	},
+	{
+		.procname	= "debug",
+		.data		= &cdrom_sysctl_settings.debug,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= cdrom_sysctl_handler,
+	},
+	{
+		.procname	= "lock",
+		.data		= &cdrom_sysctl_settings.lock,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= cdrom_sysctl_handler,
+	},
+	{
+		.procname	= "check_media",
+		.data		= &cdrom_sysctl_settings.check,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= cdrom_sysctl_handler
+	},
+	{ }
+};
+
+static struct ctl_table cdrom_cdrom_table[] = {
+	{
+		.procname	= "cdrom",
+		.maxlen		= 0,
+		.mode		= 0555,
+		.child		= cdrom_table,
+	},
+	{ }
+};
+
+/* Make sure that /proc/sys/dev is there */
+static struct ctl_table cdrom_root_table[] = {
+	{
+		.procname	= "dev",
+		.maxlen		= 0,
+		.mode		= 0555,
+		.child		= cdrom_cdrom_table,
+	},
+	{ }
+};
+static struct ctl_table_header *cdrom_sysctl_header;
+
+static void cdrom_sysctl_register(void)
+{
+	static atomic_t initialized = ATOMIC_INIT(0);
+
+	if (!atomic_add_unless(&initialized, 1, 1))
+		return;
+
+	cdrom_sysctl_header = register_sysctl_table(cdrom_root_table);
+
+	/* set the defaults */
+	cdrom_sysctl_settings.autoclose = autoclose;
+	cdrom_sysctl_settings.autoeject = autoeject;
+	cdrom_sysctl_settings.debug = debug;
+	cdrom_sysctl_settings.lock = lockdoor;
+	cdrom_sysctl_settings.check = check_media_type;
+}
+
+static void cdrom_sysctl_unregister(void)
+{
+	if (cdrom_sysctl_header)
+		unregister_sysctl_table(cdrom_sysctl_header);
+}
+
+#else /* CONFIG_SYSCTL */
+
+static void cdrom_sysctl_register(void)
+{
+}
+
+static void cdrom_sysctl_unregister(void)
+{
+}
+
+#endif /* CONFIG_SYSCTL */
+
+static int __init cdrom_init(void)
+{
+	cdrom_sysctl_register();
+
+	return 0;
+}
+
+static void __exit cdrom_exit(void)
+{
+	pr_info("Uniform CD-ROM driver unloaded\n");
+	cdrom_sysctl_unregister();
+}
+
+module_init(cdrom_init);
+module_exit(cdrom_exit);
+MODULE_LICENSE("GPL");