xref: /openbmc/linux/drivers/cdrom/cdrom.c (revision 384740dc)
1 /* linux/drivers/cdrom/cdrom.c
2    Copyright (c) 1996, 1997 David A. van Leeuwen.
3    Copyright (c) 1997, 1998 Erik Andersen <andersee@debian.org>
4    Copyright (c) 1998, 1999 Jens Axboe <axboe@image.dk>
5 
6    May be copied or modified under the terms of the GNU General Public
7    License.  See linux/COPYING for more information.
8 
9    Uniform CD-ROM driver for Linux.
10    See Documentation/cdrom/cdrom-standard.tex for usage information.
11 
12    The routines in the file provide a uniform interface between the
13    software that uses CD-ROMs and the various low-level drivers that
14    actually talk to the hardware. Suggestions are welcome.
15    Patches that work are more welcome though.  ;-)
16 
17  To Do List:
18  ----------------------------------
19 
20  -- Modify sysctl/proc interface. I plan on having one directory per
21  drive, with entries for outputing general drive information, and sysctl
22  based tunable parameters such as whether the tray should auto-close for
23  that drive. Suggestions (or patches) for this welcome!
24 
25 
26  Revision History
27  ----------------------------------
28  1.00  Date Unknown -- David van Leeuwen <david@tm.tno.nl>
29  -- Initial version by David A. van Leeuwen. I don't have a detailed
30   changelog for the 1.x series, David?
31 
32 2.00  Dec  2, 1997 -- Erik Andersen <andersee@debian.org>
33   -- New maintainer! As David A. van Leeuwen has been too busy to activly
34   maintain and improve this driver, I am now carrying on the torch. If
35   you have a problem with this driver, please feel free to contact me.
36 
37   -- Added (rudimentary) sysctl interface. I realize this is really weak
38   right now, and is _very_ badly implemented. It will be improved...
39 
40   -- Modified CDROM_DISC_STATUS so that it is now incorporated into
41   the Uniform CD-ROM driver via the cdrom_count_tracks function.
42   The cdrom_count_tracks function helps resolve some of the false
43   assumptions of the CDROM_DISC_STATUS ioctl, and is also used to check
44   for the correct media type when mounting or playing audio from a CD.
45 
46   -- Remove the calls to verify_area and only use the copy_from_user and
47   copy_to_user stuff, since these calls now provide their own memory
48   checking with the 2.1.x kernels.
49 
50   -- Major update to return codes so that errors from low-level drivers
51   are passed on through (thanks to Gerd Knorr for pointing out this
52   problem).
53 
54   -- Made it so if a function isn't implemented in a low-level driver,
55   ENOSYS is now returned instead of EINVAL.
56 
57   -- Simplified some complex logic so that the source code is easier to read.
58 
59   -- Other stuff I probably forgot to mention (lots of changes).
60 
61 2.01 to 2.11 Dec 1997-Jan 1998
62   -- TO-DO!  Write changelogs for 2.01 to 2.12.
63 
64 2.12  Jan  24, 1998 -- Erik Andersen <andersee@debian.org>
65   -- Fixed a bug in the IOCTL_IN and IOCTL_OUT macros.  It turns out that
66   copy_*_user does not return EFAULT on error, but instead returns the number
67   of bytes not copied.  I was returning whatever non-zero stuff came back from
68   the copy_*_user functions directly, which would result in strange errors.
69 
70 2.13  July 17, 1998 -- Erik Andersen <andersee@debian.org>
71   -- Fixed a bug in CDROM_SELECT_SPEED where you couldn't lower the speed
72   of the drive.  Thanks to Tobias Ringstr|m <tori@prosolvia.se> for pointing
73   this out and providing a simple fix.
74   -- Fixed the procfs-unload-module bug with the fill_inode procfs callback.
75   thanks to Andrea Arcangeli
76   -- Fixed it so that the /proc entry now also shows up when cdrom is
77   compiled into the kernel.  Before it only worked when loaded as a module.
78 
79   2.14 August 17, 1998 -- Erik Andersen <andersee@debian.org>
80   -- Fixed a bug in cdrom_media_changed and handling of reporting that
81   the media had changed for devices that _don't_ implement media_changed.
82   Thanks to Grant R. Guenther <grant@torque.net> for spotting this bug.
83   -- Made a few things more pedanticly correct.
84 
85 2.50 Oct 19, 1998 - Jens Axboe <axboe@image.dk>
86   -- New maintainers! Erik was too busy to continue the work on the driver,
87   so now Chris Zwilling <chris@cloudnet.com> and Jens Axboe <axboe@image.dk>
88   will do their best to follow in his footsteps
89 
90   2.51 Dec 20, 1998 - Jens Axboe <axboe@image.dk>
91   -- Check if drive is capable of doing what we ask before blindly changing
92   cdi->options in various ioctl.
93   -- Added version to proc entry.
94 
95   2.52 Jan 16, 1999 - Jens Axboe <axboe@image.dk>
96   -- Fixed an error in open_for_data where we would sometimes not return
97   the correct error value. Thanks Huba Gaspar <huba@softcell.hu>.
98   -- Fixed module usage count - usage was based on /proc/sys/dev
99   instead of /proc/sys/dev/cdrom. This could lead to an oops when other
100   modules had entries in dev. Feb 02 - real bug was in sysctl.c where
101   dev would be removed even though it was used. cdrom.c just illuminated
102   that bug.
103 
104   2.53 Feb 22, 1999 - Jens Axboe <axboe@image.dk>
105   -- Fixup of several ioctl calls, in particular CDROM_SET_OPTIONS has
106   been "rewritten" because capabilities and options aren't in sync. They
107   should be...
108   -- Added CDROM_LOCKDOOR ioctl. Locks the door and keeps it that way.
109   -- Added CDROM_RESET ioctl.
110   -- Added CDROM_DEBUG ioctl. Enable debug messages on-the-fly.
111   -- Added CDROM_GET_CAPABILITY ioctl. This relieves userspace programs
112   from parsing /proc/sys/dev/cdrom/info.
113 
114   2.54 Mar 15, 1999 - Jens Axboe <axboe@image.dk>
115   -- Check capability mask from low level driver when counting tracks as
116   per suggestion from Corey J. Scotts <cstotts@blue.weeg.uiowa.edu>.
117 
118   2.55 Apr 25, 1999 - Jens Axboe <axboe@image.dk>
119   -- autoclose was mistakenly checked against CDC_OPEN_TRAY instead of
120   CDC_CLOSE_TRAY.
121   -- proc info didn't mask against capabilities mask.
122 
123   3.00 Aug 5, 1999 - Jens Axboe <axboe@image.dk>
124   -- Unified audio ioctl handling across CD-ROM drivers. A lot of the
125   code was duplicated before. Drives that support the generic packet
126   interface are now being fed packets from here instead.
127   -- First attempt at adding support for MMC2 commands - for DVD and
128   CD-R(W) drives. Only the DVD parts are in now - the interface used is
129   the same as for the audio ioctls.
130   -- ioctl cleanups. if a drive couldn't play audio, it didn't get
131   a change to perform device specific ioctls as well.
132   -- Defined CDROM_CAN(CDC_XXX) for checking the capabilities.
133   -- Put in sysctl files for autoclose, autoeject, check_media, debug,
134   and lock.
135   -- /proc/sys/dev/cdrom/info has been updated to also contain info about
136   CD-Rx and DVD capabilities.
137   -- Now default to checking media type.
138   -- CDROM_SEND_PACKET ioctl added. The infrastructure was in place for
139   doing this anyway, with the generic_packet addition.
140 
141   3.01 Aug 6, 1999 - Jens Axboe <axboe@image.dk>
142   -- Fix up the sysctl handling so that the option flags get set
143   correctly.
144   -- Fix up ioctl handling so the device specific ones actually get
145   called :).
146 
147   3.02 Aug 8, 1999 - Jens Axboe <axboe@image.dk>
148   -- Fixed volume control on SCSI drives (or others with longer audio
149   page).
150   -- Fixed a couple of DVD minors. Thanks to Andrew T. Veliath
151   <andrewtv@usa.net> for telling me and for having defined the various
152   DVD structures and ioctls in the first place! He designed the original
153   DVD patches for ide-cd and while I rearranged and unified them, the
154   interface is still the same.
155 
156   3.03 Sep 1, 1999 - Jens Axboe <axboe@image.dk>
157   -- Moved the rest of the audio ioctls from the CD-ROM drivers here. Only
158   CDROMREADTOCENTRY and CDROMREADTOCHDR are left.
159   -- Moved the CDROMREADxxx ioctls in here.
160   -- Defined the cdrom_get_last_written and cdrom_get_next_block as ioctls
161   and exported functions.
162   -- Erik Andersen <andersen@xmission.com> modified all SCMD_ commands
163   to now read GPCMD_ for the new generic packet interface. All low level
164   drivers are updated as well.
165   -- Various other cleanups.
166 
167   3.04 Sep 12, 1999 - Jens Axboe <axboe@image.dk>
168   -- Fixed a couple of possible memory leaks (if an operation failed and
169   we didn't free the buffer before returning the error).
170   -- Integrated Uniform CD Changer handling from Richard Sharman
171   <rsharman@pobox.com>.
172   -- Defined CD_DVD and CD_CHANGER log levels.
173   -- Fixed the CDROMREADxxx ioctls.
174   -- CDROMPLAYTRKIND uses the GPCMD_PLAY_AUDIO_MSF command - too few
175   drives supported it. We lose the index part, however.
176   -- Small modifications to accommodate opens of /dev/hdc1, required
177   for ide-cd to handle multisession discs.
178   -- Export cdrom_mode_sense and cdrom_mode_select.
179   -- init_cdrom_command() for setting up a cgc command.
180 
181   3.05 Oct 24, 1999 - Jens Axboe <axboe@image.dk>
182   -- Changed the interface for CDROM_SEND_PACKET. Before it was virtually
183   impossible to send the drive data in a sensible way.
184   -- Lowered stack usage in mmc_ioctl(), dvd_read_disckey(), and
185   dvd_read_manufact.
186   -- Added setup of write mode for packet writing.
187   -- Fixed CDDA ripping with cdda2wav - accept much larger requests of
188   number of frames and split the reads in blocks of 8.
189 
190   3.06 Dec 13, 1999 - Jens Axboe <axboe@image.dk>
191   -- Added support for changing the region of DVD drives.
192   -- Added sense data to generic command.
193 
194   3.07 Feb 2, 2000 - Jens Axboe <axboe@suse.de>
195   -- Do same "read header length" trick in cdrom_get_disc_info() as
196   we do in cdrom_get_track_info() -- some drive don't obey specs and
197   fail if they can't supply the full Mt Fuji size table.
198   -- Deleted stuff related to setting up write modes. It has a different
199   home now.
200   -- Clear header length in mode_select unconditionally.
201   -- Removed the register_disk() that was added, not needed here.
202 
203   3.08 May 1, 2000 - Jens Axboe <axboe@suse.de>
204   -- Fix direction flag in setup_send_key and setup_report_key. This
205   gave some SCSI adapters problems.
206   -- Always return -EROFS for write opens
207   -- Convert to module_init/module_exit style init and remove some
208   of the #ifdef MODULE stuff
209   -- Fix several dvd errors - DVD_LU_SEND_ASF should pass agid,
210   DVD_HOST_SEND_RPC_STATE did not set buffer size in cdb, and
211   dvd_do_auth passed uninitialized data to drive because init_cdrom_command
212   did not clear a 0 sized buffer.
213 
214   3.09 May 12, 2000 - Jens Axboe <axboe@suse.de>
215   -- Fix Video-CD on SCSI drives that don't support READ_CD command. In
216   that case switch block size and issue plain READ_10 again, then switch
217   back.
218 
219   3.10 Jun 10, 2000 - Jens Axboe <axboe@suse.de>
220   -- Fix volume control on CD's - old SCSI-II drives now use their own
221   code, as doing MODE6 stuff in here is really not my intention.
222   -- Use READ_DISC_INFO for more reliable end-of-disc.
223 
224   3.11 Jun 12, 2000 - Jens Axboe <axboe@suse.de>
225   -- Fix bug in getting rpc phase 2 region info.
226   -- Reinstate "correct" CDROMPLAYTRKIND
227 
228    3.12 Oct 18, 2000 - Jens Axboe <axboe@suse.de>
229   -- Use quiet bit on packet commands not known to work
230 
231    3.20 Dec 17, 2003 - Jens Axboe <axboe@suse.de>
232   -- Various fixes and lots of cleanups not listed :-)
233   -- Locking fixes
234   -- Mt Rainier support
235   -- DVD-RAM write open fixes
236 
237   Nov 5 2001, Aug 8 2002. Modified by Andy Polyakov
238   <appro@fy.chalmers.se> to support MMC-3 compliant DVD+RW units.
239 
240   Modified by Nigel Kukard <nkukard@lbsd.net> - support DVD+RW
241   2.4.x patch by Andy Polyakov <appro@fy.chalmers.se>
242 
243 -------------------------------------------------------------------------*/
244 
245 #define REVISION "Revision: 3.20"
246 #define VERSION "Id: cdrom.c 3.20 2003/12/17"
247 
248 /* I use an error-log mask to give fine grain control over the type of
249    messages dumped to the system logs.  The available masks include: */
250 #define CD_NOTHING      0x0
251 #define CD_WARNING	0x1
252 #define CD_REG_UNREG	0x2
253 #define CD_DO_IOCTL	0x4
254 #define CD_OPEN		0x8
255 #define CD_CLOSE	0x10
256 #define CD_COUNT_TRACKS 0x20
257 #define CD_CHANGER	0x40
258 #define CD_DVD		0x80
259 
260 /* Define this to remove _all_ the debugging messages */
261 /* #define ERRLOGMASK CD_NOTHING */
262 #define ERRLOGMASK CD_WARNING
263 /* #define ERRLOGMASK (CD_WARNING|CD_OPEN|CD_COUNT_TRACKS|CD_CLOSE) */
264 /* #define ERRLOGMASK (CD_WARNING|CD_REG_UNREG|CD_DO_IOCTL|CD_OPEN|CD_CLOSE|CD_COUNT_TRACKS) */
265 
266 #include <linux/module.h>
267 #include <linux/fs.h>
268 #include <linux/buffer_head.h>
269 #include <linux/major.h>
270 #include <linux/types.h>
271 #include <linux/errno.h>
272 #include <linux/kernel.h>
273 #include <linux/mm.h>
274 #include <linux/slab.h>
275 #include <linux/cdrom.h>
276 #include <linux/sysctl.h>
277 #include <linux/proc_fs.h>
278 #include <linux/blkpg.h>
279 #include <linux/init.h>
280 #include <linux/fcntl.h>
281 #include <linux/blkdev.h>
282 #include <linux/times.h>
283 
284 #include <asm/uaccess.h>
285 
286 /* used to tell the module to turn on full debugging messages */
287 static int debug;
288 /* used to keep tray locked at all times */
289 static int keeplocked;
290 /* default compatibility mode */
291 static int autoclose=1;
292 static int autoeject;
293 static int lockdoor = 1;
294 /* will we ever get to use this... sigh. */
295 static int check_media_type;
296 /* automatically restart mrw format */
297 static int mrw_format_restart = 1;
298 module_param(debug, bool, 0);
299 module_param(autoclose, bool, 0);
300 module_param(autoeject, bool, 0);
301 module_param(lockdoor, bool, 0);
302 module_param(check_media_type, bool, 0);
303 module_param(mrw_format_restart, bool, 0);
304 
305 static DEFINE_MUTEX(cdrom_mutex);
306 
307 static const char *mrw_format_status[] = {
308 	"not mrw",
309 	"bgformat inactive",
310 	"bgformat active",
311 	"mrw complete",
312 };
313 
314 static const char *mrw_address_space[] = { "DMA", "GAA" };
315 
316 #if (ERRLOGMASK!=CD_NOTHING)
317 #define cdinfo(type, fmt, args...) \
318         if ((ERRLOGMASK & type) || debug==1 ) \
319             printk(KERN_INFO "cdrom: " fmt, ## args)
320 #else
321 #define cdinfo(type, fmt, args...)
322 #endif
323 
324 /* These are used to simplify getting data in from and back to user land */
325 #define IOCTL_IN(arg, type, in)					\
326 	if (copy_from_user(&(in), (type __user *) (arg), sizeof (in)))	\
327 		return -EFAULT;
328 
329 #define IOCTL_OUT(arg, type, out) \
330 	if (copy_to_user((type __user *) (arg), &(out), sizeof (out)))	\
331 		return -EFAULT;
332 
333 /* The (cdo->capability & ~cdi->mask & CDC_XXX) construct was used in
334    a lot of places. This macro makes the code more clear. */
335 #define CDROM_CAN(type) (cdi->ops->capability & ~cdi->mask & (type))
336 
337 /* used in the audio ioctls */
338 #define CHECKAUDIO if ((ret=check_for_audio_disc(cdi, cdo))) return ret
339 
340 /*
341  * Another popular OS uses 7 seconds as the hard timeout for default
342  * commands, so it is a good choice for us as well.
343  */
344 #define CDROM_DEF_TIMEOUT	(7 * HZ)
345 
346 /* Not-exported routines. */
347 static int open_for_data(struct cdrom_device_info * cdi);
348 static int check_for_audio_disc(struct cdrom_device_info * cdi,
349 			 struct cdrom_device_ops * cdo);
350 static void sanitize_format(union cdrom_addr *addr,
351 		u_char * curr, u_char requested);
352 static int mmc_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
353 		     unsigned long arg);
354 
355 int cdrom_get_last_written(struct cdrom_device_info *, long *);
356 static int cdrom_get_next_writable(struct cdrom_device_info *, long *);
357 static void cdrom_count_tracks(struct cdrom_device_info *, tracktype*);
358 
359 static int cdrom_mrw_exit(struct cdrom_device_info *cdi);
360 
361 static int cdrom_get_disc_info(struct cdrom_device_info *cdi, disc_information *di);
362 
363 static void cdrom_sysctl_register(void);
364 
365 static LIST_HEAD(cdrom_list);
366 
367 static int cdrom_dummy_generic_packet(struct cdrom_device_info *cdi,
368 				      struct packet_command *cgc)
369 {
370 	if (cgc->sense) {
371 		cgc->sense->sense_key = 0x05;
372 		cgc->sense->asc = 0x20;
373 		cgc->sense->ascq = 0x00;
374 	}
375 
376 	cgc->stat = -EIO;
377 	return -EIO;
378 }
379 
380 /* This macro makes sure we don't have to check on cdrom_device_ops
381  * existence in the run-time routines below. Change_capability is a
382  * hack to have the capability flags defined const, while we can still
383  * change it here without gcc complaining at every line.
384  */
385 #define ENSURE(call, bits) if (cdo->call == NULL) *change_capability &= ~(bits)
386 
387 int register_cdrom(struct cdrom_device_info *cdi)
388 {
389 	static char banner_printed;
390         struct cdrom_device_ops *cdo = cdi->ops;
391         int *change_capability = (int *)&cdo->capability; /* hack */
392 
393 	cdinfo(CD_OPEN, "entering register_cdrom\n");
394 
395 	if (cdo->open == NULL || cdo->release == NULL)
396 		return -EINVAL;
397 	if (!banner_printed) {
398 		printk(KERN_INFO "Uniform CD-ROM driver " REVISION "\n");
399 		banner_printed = 1;
400 		cdrom_sysctl_register();
401 	}
402 
403 	ENSURE(drive_status, CDC_DRIVE_STATUS );
404 	ENSURE(media_changed, CDC_MEDIA_CHANGED);
405 	ENSURE(tray_move, CDC_CLOSE_TRAY | CDC_OPEN_TRAY);
406 	ENSURE(lock_door, CDC_LOCK);
407 	ENSURE(select_speed, CDC_SELECT_SPEED);
408 	ENSURE(get_last_session, CDC_MULTI_SESSION);
409 	ENSURE(get_mcn, CDC_MCN);
410 	ENSURE(reset, CDC_RESET);
411 	ENSURE(generic_packet, CDC_GENERIC_PACKET);
412 	cdi->mc_flags = 0;
413 	cdo->n_minors = 0;
414         cdi->options = CDO_USE_FFLAGS;
415 
416 	if (autoclose==1 && CDROM_CAN(CDC_CLOSE_TRAY))
417 		cdi->options |= (int) CDO_AUTO_CLOSE;
418 	if (autoeject==1 && CDROM_CAN(CDC_OPEN_TRAY))
419 		cdi->options |= (int) CDO_AUTO_EJECT;
420 	if (lockdoor==1)
421 		cdi->options |= (int) CDO_LOCK;
422 	if (check_media_type==1)
423 		cdi->options |= (int) CDO_CHECK_TYPE;
424 
425 	if (CDROM_CAN(CDC_MRW_W))
426 		cdi->exit = cdrom_mrw_exit;
427 
428 	if (cdi->disk)
429 		cdi->cdda_method = CDDA_BPC_FULL;
430 	else
431 		cdi->cdda_method = CDDA_OLD;
432 
433 	if (!cdo->generic_packet)
434 		cdo->generic_packet = cdrom_dummy_generic_packet;
435 
436 	cdinfo(CD_REG_UNREG, "drive \"/dev/%s\" registered\n", cdi->name);
437 	mutex_lock(&cdrom_mutex);
438 	list_add(&cdi->list, &cdrom_list);
439 	mutex_unlock(&cdrom_mutex);
440 	return 0;
441 }
442 #undef ENSURE
443 
444 void unregister_cdrom(struct cdrom_device_info *cdi)
445 {
446 	cdinfo(CD_OPEN, "entering unregister_cdrom\n");
447 
448 	mutex_lock(&cdrom_mutex);
449 	list_del(&cdi->list);
450 	mutex_unlock(&cdrom_mutex);
451 
452 	if (cdi->exit)
453 		cdi->exit(cdi);
454 
455 	cdi->ops->n_minors--;
456 	cdinfo(CD_REG_UNREG, "drive \"/dev/%s\" unregistered\n", cdi->name);
457 }
458 
459 int cdrom_get_media_event(struct cdrom_device_info *cdi,
460 			  struct media_event_desc *med)
461 {
462 	struct packet_command cgc;
463 	unsigned char buffer[8];
464 	struct event_header *eh = (struct event_header *) buffer;
465 
466 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
467 	cgc.cmd[0] = GPCMD_GET_EVENT_STATUS_NOTIFICATION;
468 	cgc.cmd[1] = 1;		/* IMMED */
469 	cgc.cmd[4] = 1 << 4;	/* media event */
470 	cgc.cmd[8] = sizeof(buffer);
471 	cgc.quiet = 1;
472 
473 	if (cdi->ops->generic_packet(cdi, &cgc))
474 		return 1;
475 
476 	if (be16_to_cpu(eh->data_len) < sizeof(*med))
477 		return 1;
478 
479 	if (eh->nea || eh->notification_class != 0x4)
480 		return 1;
481 
482 	memcpy(med, &buffer[sizeof(*eh)], sizeof(*med));
483 	return 0;
484 }
485 
486 /*
487  * the first prototypes used 0x2c as the page code for the mrw mode page,
488  * subsequently this was changed to 0x03. probe the one used by this drive
489  */
490 static int cdrom_mrw_probe_pc(struct cdrom_device_info *cdi)
491 {
492 	struct packet_command cgc;
493 	char buffer[16];
494 
495 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
496 
497 	cgc.timeout = HZ;
498 	cgc.quiet = 1;
499 
500 	if (!cdrom_mode_sense(cdi, &cgc, MRW_MODE_PC, 0)) {
501 		cdi->mrw_mode_page = MRW_MODE_PC;
502 		return 0;
503 	} else if (!cdrom_mode_sense(cdi, &cgc, MRW_MODE_PC_PRE1, 0)) {
504 		cdi->mrw_mode_page = MRW_MODE_PC_PRE1;
505 		return 0;
506 	}
507 
508 	return 1;
509 }
510 
511 static int cdrom_is_mrw(struct cdrom_device_info *cdi, int *write)
512 {
513 	struct packet_command cgc;
514 	struct mrw_feature_desc *mfd;
515 	unsigned char buffer[16];
516 	int ret;
517 
518 	*write = 0;
519 
520 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
521 
522 	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
523 	cgc.cmd[3] = CDF_MRW;
524 	cgc.cmd[8] = sizeof(buffer);
525 	cgc.quiet = 1;
526 
527 	if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
528 		return ret;
529 
530 	mfd = (struct mrw_feature_desc *)&buffer[sizeof(struct feature_header)];
531 	if (be16_to_cpu(mfd->feature_code) != CDF_MRW)
532 		return 1;
533 	*write = mfd->write;
534 
535 	if ((ret = cdrom_mrw_probe_pc(cdi))) {
536 		*write = 0;
537 		return ret;
538 	}
539 
540 	return 0;
541 }
542 
543 static int cdrom_mrw_bgformat(struct cdrom_device_info *cdi, int cont)
544 {
545 	struct packet_command cgc;
546 	unsigned char buffer[12];
547 	int ret;
548 
549 	printk(KERN_INFO "cdrom: %sstarting format\n", cont ? "Re" : "");
550 
551 	/*
552 	 * FmtData bit set (bit 4), format type is 1
553 	 */
554 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_WRITE);
555 	cgc.cmd[0] = GPCMD_FORMAT_UNIT;
556 	cgc.cmd[1] = (1 << 4) | 1;
557 
558 	cgc.timeout = 5 * 60 * HZ;
559 
560 	/*
561 	 * 4 byte format list header, 8 byte format list descriptor
562 	 */
563 	buffer[1] = 1 << 1;
564 	buffer[3] = 8;
565 
566 	/*
567 	 * nr_blocks field
568 	 */
569 	buffer[4] = 0xff;
570 	buffer[5] = 0xff;
571 	buffer[6] = 0xff;
572 	buffer[7] = 0xff;
573 
574 	buffer[8] = 0x24 << 2;
575 	buffer[11] = cont;
576 
577 	ret = cdi->ops->generic_packet(cdi, &cgc);
578 	if (ret)
579 		printk(KERN_INFO "cdrom: bgformat failed\n");
580 
581 	return ret;
582 }
583 
584 static int cdrom_mrw_bgformat_susp(struct cdrom_device_info *cdi, int immed)
585 {
586 	struct packet_command cgc;
587 
588 	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
589 	cgc.cmd[0] = GPCMD_CLOSE_TRACK;
590 
591 	/*
592 	 * Session = 1, Track = 0
593 	 */
594 	cgc.cmd[1] = !!immed;
595 	cgc.cmd[2] = 1 << 1;
596 
597 	cgc.timeout = 5 * 60 * HZ;
598 
599 	return cdi->ops->generic_packet(cdi, &cgc);
600 }
601 
602 static int cdrom_flush_cache(struct cdrom_device_info *cdi)
603 {
604 	struct packet_command cgc;
605 
606 	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
607 	cgc.cmd[0] = GPCMD_FLUSH_CACHE;
608 
609 	cgc.timeout = 5 * 60 * HZ;
610 
611 	return cdi->ops->generic_packet(cdi, &cgc);
612 }
613 
614 static int cdrom_mrw_exit(struct cdrom_device_info *cdi)
615 {
616 	disc_information di;
617 	int ret;
618 
619 	ret = cdrom_get_disc_info(cdi, &di);
620 	if (ret < 0 || ret < (int)offsetof(typeof(di),disc_type))
621 		return 1;
622 
623 	ret = 0;
624 	if (di.mrw_status == CDM_MRW_BGFORMAT_ACTIVE) {
625 		printk(KERN_INFO "cdrom: issuing MRW back ground "
626 				"format suspend\n");
627 		ret = cdrom_mrw_bgformat_susp(cdi, 0);
628 	}
629 
630 	if (!ret && cdi->media_written)
631 		ret = cdrom_flush_cache(cdi);
632 
633 	return ret;
634 }
635 
636 static int cdrom_mrw_set_lba_space(struct cdrom_device_info *cdi, int space)
637 {
638 	struct packet_command cgc;
639 	struct mode_page_header *mph;
640 	char buffer[16];
641 	int ret, offset, size;
642 
643 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
644 
645 	cgc.buffer = buffer;
646 	cgc.buflen = sizeof(buffer);
647 
648 	if ((ret = cdrom_mode_sense(cdi, &cgc, cdi->mrw_mode_page, 0)))
649 		return ret;
650 
651 	mph = (struct mode_page_header *) buffer;
652 	offset = be16_to_cpu(mph->desc_length);
653 	size = be16_to_cpu(mph->mode_data_length) + 2;
654 
655 	buffer[offset + 3] = space;
656 	cgc.buflen = size;
657 
658 	if ((ret = cdrom_mode_select(cdi, &cgc)))
659 		return ret;
660 
661 	printk(KERN_INFO "cdrom: %s: mrw address space %s selected\n", cdi->name, mrw_address_space[space]);
662 	return 0;
663 }
664 
665 static int cdrom_get_random_writable(struct cdrom_device_info *cdi,
666 			      struct rwrt_feature_desc *rfd)
667 {
668 	struct packet_command cgc;
669 	char buffer[24];
670 	int ret;
671 
672 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
673 
674 	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;	/* often 0x46 */
675 	cgc.cmd[3] = CDF_RWRT;			/* often 0x0020 */
676 	cgc.cmd[8] = sizeof(buffer);		/* often 0x18 */
677 	cgc.quiet = 1;
678 
679 	if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
680 		return ret;
681 
682 	memcpy(rfd, &buffer[sizeof(struct feature_header)], sizeof (*rfd));
683 	return 0;
684 }
685 
686 static int cdrom_has_defect_mgt(struct cdrom_device_info *cdi)
687 {
688 	struct packet_command cgc;
689 	char buffer[16];
690 	__be16 *feature_code;
691 	int ret;
692 
693 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
694 
695 	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
696 	cgc.cmd[3] = CDF_HWDM;
697 	cgc.cmd[8] = sizeof(buffer);
698 	cgc.quiet = 1;
699 
700 	if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
701 		return ret;
702 
703 	feature_code = (__be16 *) &buffer[sizeof(struct feature_header)];
704 	if (be16_to_cpu(*feature_code) == CDF_HWDM)
705 		return 0;
706 
707 	return 1;
708 }
709 
710 
711 static int cdrom_is_random_writable(struct cdrom_device_info *cdi, int *write)
712 {
713 	struct rwrt_feature_desc rfd;
714 	int ret;
715 
716 	*write = 0;
717 
718 	if ((ret = cdrom_get_random_writable(cdi, &rfd)))
719 		return ret;
720 
721 	if (CDF_RWRT == be16_to_cpu(rfd.feature_code))
722 		*write = 1;
723 
724 	return 0;
725 }
726 
727 static int cdrom_media_erasable(struct cdrom_device_info *cdi)
728 {
729 	disc_information di;
730 	int ret;
731 
732 	ret = cdrom_get_disc_info(cdi, &di);
733 	if (ret < 0 || ret < offsetof(typeof(di), n_first_track))
734 		return -1;
735 
736 	return di.erasable;
737 }
738 
739 /*
740  * FIXME: check RO bit
741  */
742 static int cdrom_dvdram_open_write(struct cdrom_device_info *cdi)
743 {
744 	int ret = cdrom_media_erasable(cdi);
745 
746 	/*
747 	 * allow writable open if media info read worked and media is
748 	 * erasable, _or_ if it fails since not all drives support it
749 	 */
750 	if (!ret)
751 		return 1;
752 
753 	return 0;
754 }
755 
756 static int cdrom_mrw_open_write(struct cdrom_device_info *cdi)
757 {
758 	disc_information di;
759 	int ret;
760 
761 	/*
762 	 * always reset to DMA lba space on open
763 	 */
764 	if (cdrom_mrw_set_lba_space(cdi, MRW_LBA_DMA)) {
765 		printk(KERN_ERR "cdrom: failed setting lba address space\n");
766 		return 1;
767 	}
768 
769 	ret = cdrom_get_disc_info(cdi, &di);
770 	if (ret < 0 || ret < offsetof(typeof(di),disc_type))
771 		return 1;
772 
773 	if (!di.erasable)
774 		return 1;
775 
776 	/*
777 	 * mrw_status
778 	 * 0	-	not MRW formatted
779 	 * 1	-	MRW bgformat started, but not running or complete
780 	 * 2	-	MRW bgformat in progress
781 	 * 3	-	MRW formatting complete
782 	 */
783 	ret = 0;
784 	printk(KERN_INFO "cdrom open: mrw_status '%s'\n",
785 			mrw_format_status[di.mrw_status]);
786 	if (!di.mrw_status)
787 		ret = 1;
788 	else if (di.mrw_status == CDM_MRW_BGFORMAT_INACTIVE &&
789 			mrw_format_restart)
790 		ret = cdrom_mrw_bgformat(cdi, 1);
791 
792 	return ret;
793 }
794 
795 static int mo_open_write(struct cdrom_device_info *cdi)
796 {
797 	struct packet_command cgc;
798 	char buffer[255];
799 	int ret;
800 
801 	init_cdrom_command(&cgc, &buffer, 4, CGC_DATA_READ);
802 	cgc.quiet = 1;
803 
804 	/*
805 	 * obtain write protect information as per
806 	 * drivers/scsi/sd.c:sd_read_write_protect_flag
807 	 */
808 
809 	ret = cdrom_mode_sense(cdi, &cgc, GPMODE_ALL_PAGES, 0);
810 	if (ret)
811 		ret = cdrom_mode_sense(cdi, &cgc, GPMODE_VENDOR_PAGE, 0);
812 	if (ret) {
813 		cgc.buflen = 255;
814 		ret = cdrom_mode_sense(cdi, &cgc, GPMODE_ALL_PAGES, 0);
815 	}
816 
817 	/* drive gave us no info, let the user go ahead */
818 	if (ret)
819 		return 0;
820 
821 	return buffer[3] & 0x80;
822 }
823 
824 static int cdrom_ram_open_write(struct cdrom_device_info *cdi)
825 {
826 	struct rwrt_feature_desc rfd;
827 	int ret;
828 
829 	if ((ret = cdrom_has_defect_mgt(cdi)))
830 		return ret;
831 
832 	if ((ret = cdrom_get_random_writable(cdi, &rfd)))
833 		return ret;
834 	else if (CDF_RWRT == be16_to_cpu(rfd.feature_code))
835 		ret = !rfd.curr;
836 
837 	cdinfo(CD_OPEN, "can open for random write\n");
838 	return ret;
839 }
840 
841 static void cdrom_mmc3_profile(struct cdrom_device_info *cdi)
842 {
843 	struct packet_command cgc;
844 	char buffer[32];
845 	int ret, mmc3_profile;
846 
847 	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
848 
849 	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
850 	cgc.cmd[1] = 0;
851 	cgc.cmd[2] = cgc.cmd[3] = 0;		/* Starting Feature Number */
852 	cgc.cmd[8] = sizeof(buffer);		/* Allocation Length */
853 	cgc.quiet = 1;
854 
855 	if ((ret = cdi->ops->generic_packet(cdi, &cgc)))
856 		mmc3_profile = 0xffff;
857 	else
858 		mmc3_profile = (buffer[6] << 8) | buffer[7];
859 
860 	cdi->mmc3_profile = mmc3_profile;
861 }
862 
863 static int cdrom_is_dvd_rw(struct cdrom_device_info *cdi)
864 {
865 	switch (cdi->mmc3_profile) {
866 	case 0x12:	/* DVD-RAM	*/
867 	case 0x1A:	/* DVD+RW	*/
868 		return 0;
869 	default:
870 		return 1;
871 	}
872 }
873 
874 /*
875  * returns 0 for ok to open write, non-0 to disallow
876  */
877 static int cdrom_open_write(struct cdrom_device_info *cdi)
878 {
879 	int mrw, mrw_write, ram_write;
880 	int ret = 1;
881 
882 	mrw = 0;
883 	if (!cdrom_is_mrw(cdi, &mrw_write))
884 		mrw = 1;
885 
886 	if (CDROM_CAN(CDC_MO_DRIVE))
887 		ram_write = 1;
888 	else
889 		(void) cdrom_is_random_writable(cdi, &ram_write);
890 
891 	if (mrw)
892 		cdi->mask &= ~CDC_MRW;
893 	else
894 		cdi->mask |= CDC_MRW;
895 
896 	if (mrw_write)
897 		cdi->mask &= ~CDC_MRW_W;
898 	else
899 		cdi->mask |= CDC_MRW_W;
900 
901 	if (ram_write)
902 		cdi->mask &= ~CDC_RAM;
903 	else
904 		cdi->mask |= CDC_RAM;
905 
906 	if (CDROM_CAN(CDC_MRW_W))
907 		ret = cdrom_mrw_open_write(cdi);
908 	else if (CDROM_CAN(CDC_DVD_RAM))
909 		ret = cdrom_dvdram_open_write(cdi);
910  	else if (CDROM_CAN(CDC_RAM) &&
911  		 !CDROM_CAN(CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_MRW|CDC_MO_DRIVE))
912  		ret = cdrom_ram_open_write(cdi);
913 	else if (CDROM_CAN(CDC_MO_DRIVE))
914 		ret = mo_open_write(cdi);
915 	else if (!cdrom_is_dvd_rw(cdi))
916 		ret = 0;
917 
918 	return ret;
919 }
920 
921 static void cdrom_dvd_rw_close_write(struct cdrom_device_info *cdi)
922 {
923 	struct packet_command cgc;
924 
925 	if (cdi->mmc3_profile != 0x1a) {
926 		cdinfo(CD_CLOSE, "%s: No DVD+RW\n", cdi->name);
927 		return;
928 	}
929 
930 	if (!cdi->media_written) {
931 		cdinfo(CD_CLOSE, "%s: DVD+RW media clean\n", cdi->name);
932 		return;
933 	}
934 
935 	printk(KERN_INFO "cdrom: %s: dirty DVD+RW media, \"finalizing\"\n",
936 	       cdi->name);
937 
938 	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
939 	cgc.cmd[0] = GPCMD_FLUSH_CACHE;
940 	cgc.timeout = 30*HZ;
941 	cdi->ops->generic_packet(cdi, &cgc);
942 
943 	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
944 	cgc.cmd[0] = GPCMD_CLOSE_TRACK;
945 	cgc.timeout = 3000*HZ;
946 	cgc.quiet = 1;
947 	cdi->ops->generic_packet(cdi, &cgc);
948 
949 	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
950 	cgc.cmd[0] = GPCMD_CLOSE_TRACK;
951 	cgc.cmd[2] = 2;	 /* Close session */
952 	cgc.quiet = 1;
953 	cgc.timeout = 3000*HZ;
954 	cdi->ops->generic_packet(cdi, &cgc);
955 
956 	cdi->media_written = 0;
957 }
958 
959 static int cdrom_close_write(struct cdrom_device_info *cdi)
960 {
961 #if 0
962 	return cdrom_flush_cache(cdi);
963 #else
964 	return 0;
965 #endif
966 }
967 
968 /* We use the open-option O_NONBLOCK to indicate that the
969  * purpose of opening is only for subsequent ioctl() calls; no device
970  * integrity checks are performed.
971  *
972  * We hope that all cd-player programs will adopt this convention. It
973  * is in their own interest: device control becomes a lot easier
974  * this way.
975  */
976 int cdrom_open(struct cdrom_device_info *cdi, struct inode *ip, struct file *fp)
977 {
978 	int ret;
979 
980 	cdinfo(CD_OPEN, "entering cdrom_open\n");
981 
982 	/* if this was a O_NONBLOCK open and we should honor the flags,
983 	 * do a quick open without drive/disc integrity checks. */
984 	cdi->use_count++;
985 	if ((fp->f_flags & O_NONBLOCK) && (cdi->options & CDO_USE_FFLAGS)) {
986 		ret = cdi->ops->open(cdi, 1);
987 	} else {
988 		ret = open_for_data(cdi);
989 		if (ret)
990 			goto err;
991 		cdrom_mmc3_profile(cdi);
992 		if (fp->f_mode & FMODE_WRITE) {
993 			ret = -EROFS;
994 			if (cdrom_open_write(cdi))
995 				goto err_release;
996 			if (!CDROM_CAN(CDC_RAM))
997 				goto err_release;
998 			ret = 0;
999 			cdi->media_written = 0;
1000 		}
1001 	}
1002 
1003 	if (ret)
1004 		goto err;
1005 
1006 	cdinfo(CD_OPEN, "Use count for \"/dev/%s\" now %d\n",
1007 			cdi->name, cdi->use_count);
1008 	/* Do this on open.  Don't wait for mount, because they might
1009 	    not be mounting, but opening with O_NONBLOCK */
1010 	check_disk_change(ip->i_bdev);
1011 	return 0;
1012 err_release:
1013 	if (CDROM_CAN(CDC_LOCK) && cdi->options & CDO_LOCK) {
1014 		cdi->ops->lock_door(cdi, 0);
1015 		cdinfo(CD_OPEN, "door unlocked.\n");
1016 	}
1017 	cdi->ops->release(cdi);
1018 err:
1019 	cdi->use_count--;
1020 	return ret;
1021 }
1022 
1023 static
1024 int open_for_data(struct cdrom_device_info * cdi)
1025 {
1026 	int ret;
1027 	struct cdrom_device_ops *cdo = cdi->ops;
1028 	tracktype tracks;
1029 	cdinfo(CD_OPEN, "entering open_for_data\n");
1030 	/* Check if the driver can report drive status.  If it can, we
1031 	   can do clever things.  If it can't, well, we at least tried! */
1032 	if (cdo->drive_status != NULL) {
1033 		ret = cdo->drive_status(cdi, CDSL_CURRENT);
1034 		cdinfo(CD_OPEN, "drive_status=%d\n", ret);
1035 		if (ret == CDS_TRAY_OPEN) {
1036 			cdinfo(CD_OPEN, "the tray is open...\n");
1037 			/* can/may i close it? */
1038 			if (CDROM_CAN(CDC_CLOSE_TRAY) &&
1039 			    cdi->options & CDO_AUTO_CLOSE) {
1040 				cdinfo(CD_OPEN, "trying to close the tray.\n");
1041 				ret=cdo->tray_move(cdi,0);
1042 				if (ret) {
1043 					cdinfo(CD_OPEN, "bummer. tried to close the tray but failed.\n");
1044 					/* Ignore the error from the low
1045 					level driver.  We don't care why it
1046 					couldn't close the tray.  We only care
1047 					that there is no disc in the drive,
1048 					since that is the _REAL_ problem here.*/
1049 					ret=-ENOMEDIUM;
1050 					goto clean_up_and_return;
1051 				}
1052 			} else {
1053 				cdinfo(CD_OPEN, "bummer. this drive can't close the tray.\n");
1054 				ret=-ENOMEDIUM;
1055 				goto clean_up_and_return;
1056 			}
1057 			/* Ok, the door should be closed now.. Check again */
1058 			ret = cdo->drive_status(cdi, CDSL_CURRENT);
1059 			if ((ret == CDS_NO_DISC) || (ret==CDS_TRAY_OPEN)) {
1060 				cdinfo(CD_OPEN, "bummer. the tray is still not closed.\n");
1061 				cdinfo(CD_OPEN, "tray might not contain a medium.\n");
1062 				ret=-ENOMEDIUM;
1063 				goto clean_up_and_return;
1064 			}
1065 			cdinfo(CD_OPEN, "the tray is now closed.\n");
1066 		}
1067 		/* the door should be closed now, check for the disc */
1068 		ret = cdo->drive_status(cdi, CDSL_CURRENT);
1069 		if (ret!=CDS_DISC_OK) {
1070 			ret = -ENOMEDIUM;
1071 			goto clean_up_and_return;
1072 		}
1073 	}
1074 	cdrom_count_tracks(cdi, &tracks);
1075 	if (tracks.error == CDS_NO_DISC) {
1076 		cdinfo(CD_OPEN, "bummer. no disc.\n");
1077 		ret=-ENOMEDIUM;
1078 		goto clean_up_and_return;
1079 	}
1080 	/* CD-Players which don't use O_NONBLOCK, workman
1081 	 * for example, need bit CDO_CHECK_TYPE cleared! */
1082 	if (tracks.data==0) {
1083 		if (cdi->options & CDO_CHECK_TYPE) {
1084 		    /* give people a warning shot, now that CDO_CHECK_TYPE
1085 		       is the default case! */
1086 		    cdinfo(CD_OPEN, "bummer. wrong media type.\n");
1087 		    cdinfo(CD_WARNING, "pid %d must open device O_NONBLOCK!\n",
1088 					(unsigned int)task_pid_nr(current));
1089 		    ret=-EMEDIUMTYPE;
1090 		    goto clean_up_and_return;
1091 		}
1092 		else {
1093 		    cdinfo(CD_OPEN, "wrong media type, but CDO_CHECK_TYPE not set.\n");
1094 		}
1095 	}
1096 
1097 	cdinfo(CD_OPEN, "all seems well, opening the device.\n");
1098 
1099 	/* all seems well, we can open the device */
1100 	ret = cdo->open(cdi, 0); /* open for data */
1101 	cdinfo(CD_OPEN, "opening the device gave me %d.\n", ret);
1102 	/* After all this careful checking, we shouldn't have problems
1103 	   opening the device, but we don't want the device locked if
1104 	   this somehow fails... */
1105 	if (ret) {
1106 		cdinfo(CD_OPEN, "open device failed.\n");
1107 		goto clean_up_and_return;
1108 	}
1109 	if (CDROM_CAN(CDC_LOCK) && (cdi->options & CDO_LOCK)) {
1110 			cdo->lock_door(cdi, 1);
1111 			cdinfo(CD_OPEN, "door locked.\n");
1112 	}
1113 	cdinfo(CD_OPEN, "device opened successfully.\n");
1114 	return ret;
1115 
1116 	/* Something failed.  Try to unlock the drive, because some drivers
1117 	(notably ide-cd) lock the drive after every command.  This produced
1118 	a nasty bug where after mount failed, the drive would remain locked!
1119 	This ensures that the drive gets unlocked after a mount fails.  This
1120 	is a goto to avoid bloating the driver with redundant code. */
1121 clean_up_and_return:
1122 	cdinfo(CD_OPEN, "open failed.\n");
1123 	if (CDROM_CAN(CDC_LOCK) && cdi->options & CDO_LOCK) {
1124 			cdo->lock_door(cdi, 0);
1125 			cdinfo(CD_OPEN, "door unlocked.\n");
1126 	}
1127 	return ret;
1128 }
1129 
1130 /* This code is similar to that in open_for_data. The routine is called
1131    whenever an audio play operation is requested.
1132 */
1133 static int check_for_audio_disc(struct cdrom_device_info * cdi,
1134 				struct cdrom_device_ops * cdo)
1135 {
1136         int ret;
1137 	tracktype tracks;
1138 	cdinfo(CD_OPEN, "entering check_for_audio_disc\n");
1139 	if (!(cdi->options & CDO_CHECK_TYPE))
1140 		return 0;
1141 	if (cdo->drive_status != NULL) {
1142 		ret = cdo->drive_status(cdi, CDSL_CURRENT);
1143 		cdinfo(CD_OPEN, "drive_status=%d\n", ret);
1144 		if (ret == CDS_TRAY_OPEN) {
1145 			cdinfo(CD_OPEN, "the tray is open...\n");
1146 			/* can/may i close it? */
1147 			if (CDROM_CAN(CDC_CLOSE_TRAY) &&
1148 			    cdi->options & CDO_AUTO_CLOSE) {
1149 				cdinfo(CD_OPEN, "trying to close the tray.\n");
1150 				ret=cdo->tray_move(cdi,0);
1151 				if (ret) {
1152 					cdinfo(CD_OPEN, "bummer. tried to close tray but failed.\n");
1153 					/* Ignore the error from the low
1154 					level driver.  We don't care why it
1155 					couldn't close the tray.  We only care
1156 					that there is no disc in the drive,
1157 					since that is the _REAL_ problem here.*/
1158 					return -ENOMEDIUM;
1159 				}
1160 			} else {
1161 				cdinfo(CD_OPEN, "bummer. this driver can't close the tray.\n");
1162 				return -ENOMEDIUM;
1163 			}
1164 			/* Ok, the door should be closed now.. Check again */
1165 			ret = cdo->drive_status(cdi, CDSL_CURRENT);
1166 			if ((ret == CDS_NO_DISC) || (ret==CDS_TRAY_OPEN)) {
1167 				cdinfo(CD_OPEN, "bummer. the tray is still not closed.\n");
1168 				return -ENOMEDIUM;
1169 			}
1170 			if (ret!=CDS_DISC_OK) {
1171 				cdinfo(CD_OPEN, "bummer. disc isn't ready.\n");
1172 				return -EIO;
1173 			}
1174 			cdinfo(CD_OPEN, "the tray is now closed.\n");
1175 		}
1176 	}
1177 	cdrom_count_tracks(cdi, &tracks);
1178 	if (tracks.error)
1179 		return(tracks.error);
1180 
1181 	if (tracks.audio==0)
1182 		return -EMEDIUMTYPE;
1183 
1184 	return 0;
1185 }
1186 
1187 int cdrom_release(struct cdrom_device_info *cdi, struct file *fp)
1188 {
1189 	struct cdrom_device_ops *cdo = cdi->ops;
1190 	int opened_for_data;
1191 
1192 	cdinfo(CD_CLOSE, "entering cdrom_release\n");
1193 
1194 	if (cdi->use_count > 0)
1195 		cdi->use_count--;
1196 
1197 	if (cdi->use_count == 0) {
1198 		cdinfo(CD_CLOSE, "Use count for \"/dev/%s\" now zero\n", cdi->name);
1199 		cdrom_dvd_rw_close_write(cdi);
1200 
1201 		if ((cdo->capability & CDC_LOCK) && !keeplocked) {
1202 			cdinfo(CD_CLOSE, "Unlocking door!\n");
1203 			cdo->lock_door(cdi, 0);
1204 		}
1205 	}
1206 
1207 	opened_for_data = !(cdi->options & CDO_USE_FFLAGS) ||
1208 		!(fp && fp->f_flags & O_NONBLOCK);
1209 
1210 	/*
1211 	 * flush cache on last write release
1212 	 */
1213 	if (CDROM_CAN(CDC_RAM) && !cdi->use_count && cdi->for_data)
1214 		cdrom_close_write(cdi);
1215 
1216 	cdo->release(cdi);
1217 	if (cdi->use_count == 0) {      /* last process that closes dev*/
1218 		if (opened_for_data &&
1219 		    cdi->options & CDO_AUTO_EJECT && CDROM_CAN(CDC_OPEN_TRAY))
1220 			cdo->tray_move(cdi, 1);
1221 	}
1222 	return 0;
1223 }
1224 
1225 static int cdrom_read_mech_status(struct cdrom_device_info *cdi,
1226 				  struct cdrom_changer_info *buf)
1227 {
1228 	struct packet_command cgc;
1229 	struct cdrom_device_ops *cdo = cdi->ops;
1230 	int length;
1231 
1232 	/*
1233 	 * Sanyo changer isn't spec compliant (doesn't use regular change
1234 	 * LOAD_UNLOAD command, and it doesn't implement the mech status
1235 	 * command below
1236 	 */
1237 	if (cdi->sanyo_slot) {
1238 		buf->hdr.nslots = 3;
1239 		buf->hdr.curslot = cdi->sanyo_slot == 3 ? 0 : cdi->sanyo_slot;
1240 		for (length = 0; length < 3; length++) {
1241 			buf->slots[length].disc_present = 1;
1242 			buf->slots[length].change = 0;
1243 		}
1244 		return 0;
1245 	}
1246 
1247 	length = sizeof(struct cdrom_mechstat_header) +
1248 		 cdi->capacity * sizeof(struct cdrom_slot);
1249 
1250 	init_cdrom_command(&cgc, buf, length, CGC_DATA_READ);
1251 	cgc.cmd[0] = GPCMD_MECHANISM_STATUS;
1252 	cgc.cmd[8] = (length >> 8) & 0xff;
1253 	cgc.cmd[9] = length & 0xff;
1254 	return cdo->generic_packet(cdi, &cgc);
1255 }
1256 
1257 static int cdrom_slot_status(struct cdrom_device_info *cdi, int slot)
1258 {
1259 	struct cdrom_changer_info *info;
1260 	int ret;
1261 
1262 	cdinfo(CD_CHANGER, "entering cdrom_slot_status()\n");
1263 	if (cdi->sanyo_slot)
1264 		return CDS_NO_INFO;
1265 
1266 	info = kmalloc(sizeof(*info), GFP_KERNEL);
1267 	if (!info)
1268 		return -ENOMEM;
1269 
1270 	if ((ret = cdrom_read_mech_status(cdi, info)))
1271 		goto out_free;
1272 
1273 	if (info->slots[slot].disc_present)
1274 		ret = CDS_DISC_OK;
1275 	else
1276 		ret = CDS_NO_DISC;
1277 
1278 out_free:
1279 	kfree(info);
1280 	return ret;
1281 }
1282 
1283 /* Return the number of slots for an ATAPI/SCSI cdrom,
1284  * return 1 if not a changer.
1285  */
1286 int cdrom_number_of_slots(struct cdrom_device_info *cdi)
1287 {
1288 	int status;
1289 	int nslots = 1;
1290 	struct cdrom_changer_info *info;
1291 
1292 	cdinfo(CD_CHANGER, "entering cdrom_number_of_slots()\n");
1293 	/* cdrom_read_mech_status requires a valid value for capacity: */
1294 	cdi->capacity = 0;
1295 
1296 	info = kmalloc(sizeof(*info), GFP_KERNEL);
1297 	if (!info)
1298 		return -ENOMEM;
1299 
1300 	if ((status = cdrom_read_mech_status(cdi, info)) == 0)
1301 		nslots = info->hdr.nslots;
1302 
1303 	kfree(info);
1304 	return nslots;
1305 }
1306 
1307 
1308 /* If SLOT < 0, unload the current slot.  Otherwise, try to load SLOT. */
1309 static int cdrom_load_unload(struct cdrom_device_info *cdi, int slot)
1310 {
1311 	struct packet_command cgc;
1312 
1313 	cdinfo(CD_CHANGER, "entering cdrom_load_unload()\n");
1314 	if (cdi->sanyo_slot && slot < 0)
1315 		return 0;
1316 
1317 	init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1318 	cgc.cmd[0] = GPCMD_LOAD_UNLOAD;
1319 	cgc.cmd[4] = 2 + (slot >= 0);
1320 	cgc.cmd[8] = slot;
1321 	cgc.timeout = 60 * HZ;
1322 
1323 	/* The Sanyo 3 CD changer uses byte 7 of the
1324 	GPCMD_TEST_UNIT_READY to command to switch CDs instead of
1325 	using the GPCMD_LOAD_UNLOAD opcode. */
1326 	if (cdi->sanyo_slot && -1 < slot) {
1327 		cgc.cmd[0] = GPCMD_TEST_UNIT_READY;
1328 		cgc.cmd[7] = slot;
1329 		cgc.cmd[4] = cgc.cmd[8] = 0;
1330 		cdi->sanyo_slot = slot ? slot : 3;
1331 	}
1332 
1333 	return cdi->ops->generic_packet(cdi, &cgc);
1334 }
1335 
1336 static int cdrom_select_disc(struct cdrom_device_info *cdi, int slot)
1337 {
1338 	struct cdrom_changer_info *info;
1339 	int curslot;
1340 	int ret;
1341 
1342 	cdinfo(CD_CHANGER, "entering cdrom_select_disc()\n");
1343 	if (!CDROM_CAN(CDC_SELECT_DISC))
1344 		return -EDRIVE_CANT_DO_THIS;
1345 
1346 	(void) cdi->ops->media_changed(cdi, slot);
1347 
1348 	if (slot == CDSL_NONE) {
1349 		/* set media changed bits, on both queues */
1350 		cdi->mc_flags = 0x3;
1351 		return cdrom_load_unload(cdi, -1);
1352 	}
1353 
1354 	info = kmalloc(sizeof(*info), GFP_KERNEL);
1355 	if (!info)
1356 		return -ENOMEM;
1357 
1358 	if ((ret = cdrom_read_mech_status(cdi, info))) {
1359 		kfree(info);
1360 		return ret;
1361 	}
1362 
1363 	curslot = info->hdr.curslot;
1364 	kfree(info);
1365 
1366 	if (cdi->use_count > 1 || keeplocked) {
1367 		if (slot == CDSL_CURRENT) {
1368 	    		return curslot;
1369 		} else {
1370 			return -EBUSY;
1371 		}
1372 	}
1373 
1374 	/* Specifying CDSL_CURRENT will attempt to load the currnet slot,
1375 	which is useful if it had been previously unloaded.
1376 	Whether it can or not, it returns the current slot.
1377 	Similarly,  if slot happens to be the current one, we still
1378 	try and load it. */
1379 	if (slot == CDSL_CURRENT)
1380 		slot = curslot;
1381 
1382 	/* set media changed bits on both queues */
1383 	cdi->mc_flags = 0x3;
1384 	if ((ret = cdrom_load_unload(cdi, slot)))
1385 		return ret;
1386 
1387 	return slot;
1388 }
1389 
1390 /* We want to make media_changed accessible to the user through an
1391  * ioctl. The main problem now is that we must double-buffer the
1392  * low-level implementation, to assure that the VFS and the user both
1393  * see a medium change once.
1394  */
1395 
1396 static
1397 int media_changed(struct cdrom_device_info *cdi, int queue)
1398 {
1399 	unsigned int mask = (1 << (queue & 1));
1400 	int ret = !!(cdi->mc_flags & mask);
1401 
1402 	if (!CDROM_CAN(CDC_MEDIA_CHANGED))
1403 	    return ret;
1404 	/* changed since last call? */
1405 	if (cdi->ops->media_changed(cdi, CDSL_CURRENT)) {
1406 		cdi->mc_flags = 0x3;    /* set bit on both queues */
1407 		ret |= 1;
1408 		cdi->media_written = 0;
1409 	}
1410 	cdi->mc_flags &= ~mask;         /* clear bit */
1411 	return ret;
1412 }
1413 
1414 int cdrom_media_changed(struct cdrom_device_info *cdi)
1415 {
1416 	/* This talks to the VFS, which doesn't like errors - just 1 or 0.
1417 	 * Returning "0" is always safe (media hasn't been changed). Do that
1418 	 * if the low-level cdrom driver dosn't support media changed. */
1419 	if (cdi == NULL || cdi->ops->media_changed == NULL)
1420 		return 0;
1421 	if (!CDROM_CAN(CDC_MEDIA_CHANGED))
1422 		return 0;
1423 	return media_changed(cdi, 0);
1424 }
1425 
1426 /* badly broken, I know. Is due for a fixup anytime. */
1427 static void cdrom_count_tracks(struct cdrom_device_info *cdi, tracktype* tracks)
1428 {
1429 	struct cdrom_tochdr header;
1430 	struct cdrom_tocentry entry;
1431 	int ret, i;
1432 	tracks->data=0;
1433 	tracks->audio=0;
1434 	tracks->cdi=0;
1435 	tracks->xa=0;
1436 	tracks->error=0;
1437 	cdinfo(CD_COUNT_TRACKS, "entering cdrom_count_tracks\n");
1438 	/* Grab the TOC header so we can see how many tracks there are */
1439 	if ((ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCHDR, &header))) {
1440 		if (ret == -ENOMEDIUM)
1441 			tracks->error = CDS_NO_DISC;
1442 		else
1443 			tracks->error = CDS_NO_INFO;
1444 		return;
1445 	}
1446 	/* check what type of tracks are on this disc */
1447 	entry.cdte_format = CDROM_MSF;
1448 	for (i = header.cdth_trk0; i <= header.cdth_trk1; i++) {
1449 		entry.cdte_track  = i;
1450 		if (cdi->ops->audio_ioctl(cdi, CDROMREADTOCENTRY, &entry)) {
1451 			tracks->error=CDS_NO_INFO;
1452 			return;
1453 		}
1454 		if (entry.cdte_ctrl & CDROM_DATA_TRACK) {
1455 		    if (entry.cdte_format == 0x10)
1456 			tracks->cdi++;
1457 		    else if (entry.cdte_format == 0x20)
1458 			tracks->xa++;
1459 		    else
1460 			tracks->data++;
1461 		} else
1462 		    tracks->audio++;
1463 		cdinfo(CD_COUNT_TRACKS, "track %d: format=%d, ctrl=%d\n",
1464 		       i, entry.cdte_format, entry.cdte_ctrl);
1465 	}
1466 	cdinfo(CD_COUNT_TRACKS, "disc has %d tracks: %d=audio %d=data %d=Cd-I %d=XA\n",
1467 		header.cdth_trk1, tracks->audio, tracks->data,
1468 		tracks->cdi, tracks->xa);
1469 }
1470 
1471 /* Requests to the low-level drivers will /always/ be done in the
1472    following format convention:
1473 
1474    CDROM_LBA: all data-related requests.
1475    CDROM_MSF: all audio-related requests.
1476 
1477    However, a low-level implementation is allowed to refuse this
1478    request, and return information in its own favorite format.
1479 
1480    It doesn't make sense /at all/ to ask for a play_audio in LBA
1481    format, or ask for multi-session info in MSF format. However, for
1482    backward compatibility these format requests will be satisfied, but
1483    the requests to the low-level drivers will be sanitized in the more
1484    meaningful format indicated above.
1485  */
1486 
1487 static
1488 void sanitize_format(union cdrom_addr *addr,
1489 		     u_char * curr, u_char requested)
1490 {
1491 	if (*curr == requested)
1492 		return;                 /* nothing to be done! */
1493 	if (requested == CDROM_LBA) {
1494 		addr->lba = (int) addr->msf.frame +
1495 			75 * (addr->msf.second - 2 + 60 * addr->msf.minute);
1496 	} else {                        /* CDROM_MSF */
1497 		int lba = addr->lba;
1498 		addr->msf.frame = lba % 75;
1499 		lba /= 75;
1500 		lba += 2;
1501 		addr->msf.second = lba % 60;
1502 		addr->msf.minute = lba / 60;
1503 	}
1504 	*curr = requested;
1505 }
1506 
1507 void init_cdrom_command(struct packet_command *cgc, void *buf, int len,
1508 			int type)
1509 {
1510 	memset(cgc, 0, sizeof(struct packet_command));
1511 	if (buf)
1512 		memset(buf, 0, len);
1513 	cgc->buffer = (char *) buf;
1514 	cgc->buflen = len;
1515 	cgc->data_direction = type;
1516 	cgc->timeout = CDROM_DEF_TIMEOUT;
1517 }
1518 
1519 /* DVD handling */
1520 
1521 #define copy_key(dest,src)	memcpy((dest), (src), sizeof(dvd_key))
1522 #define copy_chal(dest,src)	memcpy((dest), (src), sizeof(dvd_challenge))
1523 
1524 static void setup_report_key(struct packet_command *cgc, unsigned agid, unsigned type)
1525 {
1526 	cgc->cmd[0] = GPCMD_REPORT_KEY;
1527 	cgc->cmd[10] = type | (agid << 6);
1528 	switch (type) {
1529 		case 0: case 8: case 5: {
1530 			cgc->buflen = 8;
1531 			break;
1532 		}
1533 		case 1: {
1534 			cgc->buflen = 16;
1535 			break;
1536 		}
1537 		case 2: case 4: {
1538 			cgc->buflen = 12;
1539 			break;
1540 		}
1541 	}
1542 	cgc->cmd[9] = cgc->buflen;
1543 	cgc->data_direction = CGC_DATA_READ;
1544 }
1545 
1546 static void setup_send_key(struct packet_command *cgc, unsigned agid, unsigned type)
1547 {
1548 	cgc->cmd[0] = GPCMD_SEND_KEY;
1549 	cgc->cmd[10] = type | (agid << 6);
1550 	switch (type) {
1551 		case 1: {
1552 			cgc->buflen = 16;
1553 			break;
1554 		}
1555 		case 3: {
1556 			cgc->buflen = 12;
1557 			break;
1558 		}
1559 		case 6: {
1560 			cgc->buflen = 8;
1561 			break;
1562 		}
1563 	}
1564 	cgc->cmd[9] = cgc->buflen;
1565 	cgc->data_direction = CGC_DATA_WRITE;
1566 }
1567 
1568 static int dvd_do_auth(struct cdrom_device_info *cdi, dvd_authinfo *ai)
1569 {
1570 	int ret;
1571 	u_char buf[20];
1572 	struct packet_command cgc;
1573 	struct cdrom_device_ops *cdo = cdi->ops;
1574 	rpc_state_t rpc_state;
1575 
1576 	memset(buf, 0, sizeof(buf));
1577 	init_cdrom_command(&cgc, buf, 0, CGC_DATA_READ);
1578 
1579 	switch (ai->type) {
1580 	/* LU data send */
1581 	case DVD_LU_SEND_AGID:
1582 		cdinfo(CD_DVD, "entering DVD_LU_SEND_AGID\n");
1583 		cgc.quiet = 1;
1584 		setup_report_key(&cgc, ai->lsa.agid, 0);
1585 
1586 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1587 			return ret;
1588 
1589 		ai->lsa.agid = buf[7] >> 6;
1590 		/* Returning data, let host change state */
1591 		break;
1592 
1593 	case DVD_LU_SEND_KEY1:
1594 		cdinfo(CD_DVD, "entering DVD_LU_SEND_KEY1\n");
1595 		setup_report_key(&cgc, ai->lsk.agid, 2);
1596 
1597 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1598 			return ret;
1599 
1600 		copy_key(ai->lsk.key, &buf[4]);
1601 		/* Returning data, let host change state */
1602 		break;
1603 
1604 	case DVD_LU_SEND_CHALLENGE:
1605 		cdinfo(CD_DVD, "entering DVD_LU_SEND_CHALLENGE\n");
1606 		setup_report_key(&cgc, ai->lsc.agid, 1);
1607 
1608 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1609 			return ret;
1610 
1611 		copy_chal(ai->lsc.chal, &buf[4]);
1612 		/* Returning data, let host change state */
1613 		break;
1614 
1615 	/* Post-auth key */
1616 	case DVD_LU_SEND_TITLE_KEY:
1617 		cdinfo(CD_DVD, "entering DVD_LU_SEND_TITLE_KEY\n");
1618 		cgc.quiet = 1;
1619 		setup_report_key(&cgc, ai->lstk.agid, 4);
1620 		cgc.cmd[5] = ai->lstk.lba;
1621 		cgc.cmd[4] = ai->lstk.lba >> 8;
1622 		cgc.cmd[3] = ai->lstk.lba >> 16;
1623 		cgc.cmd[2] = ai->lstk.lba >> 24;
1624 
1625 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1626 			return ret;
1627 
1628 		ai->lstk.cpm = (buf[4] >> 7) & 1;
1629 		ai->lstk.cp_sec = (buf[4] >> 6) & 1;
1630 		ai->lstk.cgms = (buf[4] >> 4) & 3;
1631 		copy_key(ai->lstk.title_key, &buf[5]);
1632 		/* Returning data, let host change state */
1633 		break;
1634 
1635 	case DVD_LU_SEND_ASF:
1636 		cdinfo(CD_DVD, "entering DVD_LU_SEND_ASF\n");
1637 		setup_report_key(&cgc, ai->lsasf.agid, 5);
1638 
1639 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1640 			return ret;
1641 
1642 		ai->lsasf.asf = buf[7] & 1;
1643 		break;
1644 
1645 	/* LU data receive (LU changes state) */
1646 	case DVD_HOST_SEND_CHALLENGE:
1647 		cdinfo(CD_DVD, "entering DVD_HOST_SEND_CHALLENGE\n");
1648 		setup_send_key(&cgc, ai->hsc.agid, 1);
1649 		buf[1] = 0xe;
1650 		copy_chal(&buf[4], ai->hsc.chal);
1651 
1652 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1653 			return ret;
1654 
1655 		ai->type = DVD_LU_SEND_KEY1;
1656 		break;
1657 
1658 	case DVD_HOST_SEND_KEY2:
1659 		cdinfo(CD_DVD, "entering DVD_HOST_SEND_KEY2\n");
1660 		setup_send_key(&cgc, ai->hsk.agid, 3);
1661 		buf[1] = 0xa;
1662 		copy_key(&buf[4], ai->hsk.key);
1663 
1664 		if ((ret = cdo->generic_packet(cdi, &cgc))) {
1665 			ai->type = DVD_AUTH_FAILURE;
1666 			return ret;
1667 		}
1668 		ai->type = DVD_AUTH_ESTABLISHED;
1669 		break;
1670 
1671 	/* Misc */
1672 	case DVD_INVALIDATE_AGID:
1673 		cgc.quiet = 1;
1674 		cdinfo(CD_DVD, "entering DVD_INVALIDATE_AGID\n");
1675 		setup_report_key(&cgc, ai->lsa.agid, 0x3f);
1676 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1677 			return ret;
1678 		break;
1679 
1680 	/* Get region settings */
1681 	case DVD_LU_SEND_RPC_STATE:
1682 		cdinfo(CD_DVD, "entering DVD_LU_SEND_RPC_STATE\n");
1683 		setup_report_key(&cgc, 0, 8);
1684 		memset(&rpc_state, 0, sizeof(rpc_state_t));
1685 		cgc.buffer = (char *) &rpc_state;
1686 
1687 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1688 			return ret;
1689 
1690 		ai->lrpcs.type = rpc_state.type_code;
1691 		ai->lrpcs.vra = rpc_state.vra;
1692 		ai->lrpcs.ucca = rpc_state.ucca;
1693 		ai->lrpcs.region_mask = rpc_state.region_mask;
1694 		ai->lrpcs.rpc_scheme = rpc_state.rpc_scheme;
1695 		break;
1696 
1697 	/* Set region settings */
1698 	case DVD_HOST_SEND_RPC_STATE:
1699 		cdinfo(CD_DVD, "entering DVD_HOST_SEND_RPC_STATE\n");
1700 		setup_send_key(&cgc, 0, 6);
1701 		buf[1] = 6;
1702 		buf[4] = ai->hrpcs.pdrc;
1703 
1704 		if ((ret = cdo->generic_packet(cdi, &cgc)))
1705 			return ret;
1706 		break;
1707 
1708 	default:
1709 		cdinfo(CD_WARNING, "Invalid DVD key ioctl (%d)\n", ai->type);
1710 		return -ENOTTY;
1711 	}
1712 
1713 	return 0;
1714 }
1715 
1716 static int dvd_read_physical(struct cdrom_device_info *cdi, dvd_struct *s)
1717 {
1718 	unsigned char buf[21], *base;
1719 	struct dvd_layer *layer;
1720 	struct packet_command cgc;
1721 	struct cdrom_device_ops *cdo = cdi->ops;
1722 	int ret, layer_num = s->physical.layer_num;
1723 
1724 	if (layer_num >= DVD_LAYERS)
1725 		return -EINVAL;
1726 
1727 	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1728 	cgc.cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1729 	cgc.cmd[6] = layer_num;
1730 	cgc.cmd[7] = s->type;
1731 	cgc.cmd[9] = cgc.buflen & 0xff;
1732 
1733 	/*
1734 	 * refrain from reporting errors on non-existing layers (mainly)
1735 	 */
1736 	cgc.quiet = 1;
1737 
1738 	if ((ret = cdo->generic_packet(cdi, &cgc)))
1739 		return ret;
1740 
1741 	base = &buf[4];
1742 	layer = &s->physical.layer[layer_num];
1743 
1744 	/*
1745 	 * place the data... really ugly, but at least we won't have to
1746 	 * worry about endianess in userspace.
1747 	 */
1748 	memset(layer, 0, sizeof(*layer));
1749 	layer->book_version = base[0] & 0xf;
1750 	layer->book_type = base[0] >> 4;
1751 	layer->min_rate = base[1] & 0xf;
1752 	layer->disc_size = base[1] >> 4;
1753 	layer->layer_type = base[2] & 0xf;
1754 	layer->track_path = (base[2] >> 4) & 1;
1755 	layer->nlayers = (base[2] >> 5) & 3;
1756 	layer->track_density = base[3] & 0xf;
1757 	layer->linear_density = base[3] >> 4;
1758 	layer->start_sector = base[5] << 16 | base[6] << 8 | base[7];
1759 	layer->end_sector = base[9] << 16 | base[10] << 8 | base[11];
1760 	layer->end_sector_l0 = base[13] << 16 | base[14] << 8 | base[15];
1761 	layer->bca = base[16] >> 7;
1762 
1763 	return 0;
1764 }
1765 
1766 static int dvd_read_copyright(struct cdrom_device_info *cdi, dvd_struct *s)
1767 {
1768 	int ret;
1769 	u_char buf[8];
1770 	struct packet_command cgc;
1771 	struct cdrom_device_ops *cdo = cdi->ops;
1772 
1773 	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1774 	cgc.cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1775 	cgc.cmd[6] = s->copyright.layer_num;
1776 	cgc.cmd[7] = s->type;
1777 	cgc.cmd[8] = cgc.buflen >> 8;
1778 	cgc.cmd[9] = cgc.buflen & 0xff;
1779 
1780 	if ((ret = cdo->generic_packet(cdi, &cgc)))
1781 		return ret;
1782 
1783 	s->copyright.cpst = buf[4];
1784 	s->copyright.rmi = buf[5];
1785 
1786 	return 0;
1787 }
1788 
1789 static int dvd_read_disckey(struct cdrom_device_info *cdi, dvd_struct *s)
1790 {
1791 	int ret, size;
1792 	u_char *buf;
1793 	struct packet_command cgc;
1794 	struct cdrom_device_ops *cdo = cdi->ops;
1795 
1796 	size = sizeof(s->disckey.value) + 4;
1797 
1798 	if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1799 		return -ENOMEM;
1800 
1801 	init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
1802 	cgc.cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1803 	cgc.cmd[7] = s->type;
1804 	cgc.cmd[8] = size >> 8;
1805 	cgc.cmd[9] = size & 0xff;
1806 	cgc.cmd[10] = s->disckey.agid << 6;
1807 
1808 	if (!(ret = cdo->generic_packet(cdi, &cgc)))
1809 		memcpy(s->disckey.value, &buf[4], sizeof(s->disckey.value));
1810 
1811 	kfree(buf);
1812 	return ret;
1813 }
1814 
1815 static int dvd_read_bca(struct cdrom_device_info *cdi, dvd_struct *s)
1816 {
1817 	int ret;
1818 	u_char buf[4 + 188];
1819 	struct packet_command cgc;
1820 	struct cdrom_device_ops *cdo = cdi->ops;
1821 
1822 	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1823 	cgc.cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1824 	cgc.cmd[7] = s->type;
1825 	cgc.cmd[9] = cgc.buflen & 0xff;
1826 
1827 	if ((ret = cdo->generic_packet(cdi, &cgc)))
1828 		return ret;
1829 
1830 	s->bca.len = buf[0] << 8 | buf[1];
1831 	if (s->bca.len < 12 || s->bca.len > 188) {
1832 		cdinfo(CD_WARNING, "Received invalid BCA length (%d)\n", s->bca.len);
1833 		return -EIO;
1834 	}
1835 	memcpy(s->bca.value, &buf[4], s->bca.len);
1836 
1837 	return 0;
1838 }
1839 
1840 static int dvd_read_manufact(struct cdrom_device_info *cdi, dvd_struct *s)
1841 {
1842 	int ret = 0, size;
1843 	u_char *buf;
1844 	struct packet_command cgc;
1845 	struct cdrom_device_ops *cdo = cdi->ops;
1846 
1847 	size = sizeof(s->manufact.value) + 4;
1848 
1849 	if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1850 		return -ENOMEM;
1851 
1852 	init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
1853 	cgc.cmd[0] = GPCMD_READ_DVD_STRUCTURE;
1854 	cgc.cmd[7] = s->type;
1855 	cgc.cmd[8] = size >> 8;
1856 	cgc.cmd[9] = size & 0xff;
1857 
1858 	if ((ret = cdo->generic_packet(cdi, &cgc))) {
1859 		kfree(buf);
1860 		return ret;
1861 	}
1862 
1863 	s->manufact.len = buf[0] << 8 | buf[1];
1864 	if (s->manufact.len < 0 || s->manufact.len > 2048) {
1865 		cdinfo(CD_WARNING, "Received invalid manufacture info length"
1866 				   " (%d)\n", s->manufact.len);
1867 		ret = -EIO;
1868 	} else {
1869 		memcpy(s->manufact.value, &buf[4], s->manufact.len);
1870 	}
1871 
1872 	kfree(buf);
1873 	return ret;
1874 }
1875 
1876 static int dvd_read_struct(struct cdrom_device_info *cdi, dvd_struct *s)
1877 {
1878 	switch (s->type) {
1879 	case DVD_STRUCT_PHYSICAL:
1880 		return dvd_read_physical(cdi, s);
1881 
1882 	case DVD_STRUCT_COPYRIGHT:
1883 		return dvd_read_copyright(cdi, s);
1884 
1885 	case DVD_STRUCT_DISCKEY:
1886 		return dvd_read_disckey(cdi, s);
1887 
1888 	case DVD_STRUCT_BCA:
1889 		return dvd_read_bca(cdi, s);
1890 
1891 	case DVD_STRUCT_MANUFACT:
1892 		return dvd_read_manufact(cdi, s);
1893 
1894 	default:
1895 		cdinfo(CD_WARNING, ": Invalid DVD structure read requested (%d)\n",
1896 					s->type);
1897 		return -EINVAL;
1898 	}
1899 }
1900 
1901 int cdrom_mode_sense(struct cdrom_device_info *cdi,
1902 		     struct packet_command *cgc,
1903 		     int page_code, int page_control)
1904 {
1905 	struct cdrom_device_ops *cdo = cdi->ops;
1906 
1907 	memset(cgc->cmd, 0, sizeof(cgc->cmd));
1908 
1909 	cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1910 	cgc->cmd[2] = page_code | (page_control << 6);
1911 	cgc->cmd[7] = cgc->buflen >> 8;
1912 	cgc->cmd[8] = cgc->buflen & 0xff;
1913 	cgc->data_direction = CGC_DATA_READ;
1914 	return cdo->generic_packet(cdi, cgc);
1915 }
1916 
1917 int cdrom_mode_select(struct cdrom_device_info *cdi,
1918 		      struct packet_command *cgc)
1919 {
1920 	struct cdrom_device_ops *cdo = cdi->ops;
1921 
1922 	memset(cgc->cmd, 0, sizeof(cgc->cmd));
1923 	memset(cgc->buffer, 0, 2);
1924 	cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1925 	cgc->cmd[1] = 0x10;		/* PF */
1926 	cgc->cmd[7] = cgc->buflen >> 8;
1927 	cgc->cmd[8] = cgc->buflen & 0xff;
1928 	cgc->data_direction = CGC_DATA_WRITE;
1929 	return cdo->generic_packet(cdi, cgc);
1930 }
1931 
1932 static int cdrom_read_subchannel(struct cdrom_device_info *cdi,
1933 				 struct cdrom_subchnl *subchnl, int mcn)
1934 {
1935 	struct cdrom_device_ops *cdo = cdi->ops;
1936 	struct packet_command cgc;
1937 	char buffer[32];
1938 	int ret;
1939 
1940 	init_cdrom_command(&cgc, buffer, 16, CGC_DATA_READ);
1941 	cgc.cmd[0] = GPCMD_READ_SUBCHANNEL;
1942 	cgc.cmd[1] = 2;     /* MSF addressing */
1943 	cgc.cmd[2] = 0x40;  /* request subQ data */
1944 	cgc.cmd[3] = mcn ? 2 : 1;
1945 	cgc.cmd[8] = 16;
1946 
1947 	if ((ret = cdo->generic_packet(cdi, &cgc)))
1948 		return ret;
1949 
1950 	subchnl->cdsc_audiostatus = cgc.buffer[1];
1951 	subchnl->cdsc_format = CDROM_MSF;
1952 	subchnl->cdsc_ctrl = cgc.buffer[5] & 0xf;
1953 	subchnl->cdsc_trk = cgc.buffer[6];
1954 	subchnl->cdsc_ind = cgc.buffer[7];
1955 
1956 	subchnl->cdsc_reladdr.msf.minute = cgc.buffer[13];
1957 	subchnl->cdsc_reladdr.msf.second = cgc.buffer[14];
1958 	subchnl->cdsc_reladdr.msf.frame = cgc.buffer[15];
1959 	subchnl->cdsc_absaddr.msf.minute = cgc.buffer[9];
1960 	subchnl->cdsc_absaddr.msf.second = cgc.buffer[10];
1961 	subchnl->cdsc_absaddr.msf.frame = cgc.buffer[11];
1962 
1963 	return 0;
1964 }
1965 
1966 /*
1967  * Specific READ_10 interface
1968  */
1969 static int cdrom_read_cd(struct cdrom_device_info *cdi,
1970 			 struct packet_command *cgc, int lba,
1971 			 int blocksize, int nblocks)
1972 {
1973 	struct cdrom_device_ops *cdo = cdi->ops;
1974 
1975 	memset(&cgc->cmd, 0, sizeof(cgc->cmd));
1976 	cgc->cmd[0] = GPCMD_READ_10;
1977 	cgc->cmd[2] = (lba >> 24) & 0xff;
1978 	cgc->cmd[3] = (lba >> 16) & 0xff;
1979 	cgc->cmd[4] = (lba >>  8) & 0xff;
1980 	cgc->cmd[5] = lba & 0xff;
1981 	cgc->cmd[6] = (nblocks >> 16) & 0xff;
1982 	cgc->cmd[7] = (nblocks >>  8) & 0xff;
1983 	cgc->cmd[8] = nblocks & 0xff;
1984 	cgc->buflen = blocksize * nblocks;
1985 	return cdo->generic_packet(cdi, cgc);
1986 }
1987 
1988 /* very generic interface for reading the various types of blocks */
1989 static int cdrom_read_block(struct cdrom_device_info *cdi,
1990 			    struct packet_command *cgc,
1991 			    int lba, int nblocks, int format, int blksize)
1992 {
1993 	struct cdrom_device_ops *cdo = cdi->ops;
1994 
1995 	memset(&cgc->cmd, 0, sizeof(cgc->cmd));
1996 	cgc->cmd[0] = GPCMD_READ_CD;
1997 	/* expected sector size - cdda,mode1,etc. */
1998 	cgc->cmd[1] = format << 2;
1999 	/* starting address */
2000 	cgc->cmd[2] = (lba >> 24) & 0xff;
2001 	cgc->cmd[3] = (lba >> 16) & 0xff;
2002 	cgc->cmd[4] = (lba >>  8) & 0xff;
2003 	cgc->cmd[5] = lba & 0xff;
2004 	/* number of blocks */
2005 	cgc->cmd[6] = (nblocks >> 16) & 0xff;
2006 	cgc->cmd[7] = (nblocks >>  8) & 0xff;
2007 	cgc->cmd[8] = nblocks & 0xff;
2008 	cgc->buflen = blksize * nblocks;
2009 
2010 	/* set the header info returned */
2011 	switch (blksize) {
2012 	case CD_FRAMESIZE_RAW0	: cgc->cmd[9] = 0x58; break;
2013 	case CD_FRAMESIZE_RAW1	: cgc->cmd[9] = 0x78; break;
2014 	case CD_FRAMESIZE_RAW	: cgc->cmd[9] = 0xf8; break;
2015 	default			: cgc->cmd[9] = 0x10;
2016 	}
2017 
2018 	return cdo->generic_packet(cdi, cgc);
2019 }
2020 
2021 static int cdrom_read_cdda_old(struct cdrom_device_info *cdi, __u8 __user *ubuf,
2022 			       int lba, int nframes)
2023 {
2024 	struct packet_command cgc;
2025 	int ret = 0;
2026 	int nr;
2027 
2028 	cdi->last_sense = 0;
2029 
2030 	memset(&cgc, 0, sizeof(cgc));
2031 
2032 	/*
2033 	 * start with will ra.nframes size, back down if alloc fails
2034 	 */
2035 	nr = nframes;
2036 	do {
2037 		cgc.buffer = kmalloc(CD_FRAMESIZE_RAW * nr, GFP_KERNEL);
2038 		if (cgc.buffer)
2039 			break;
2040 
2041 		nr >>= 1;
2042 	} while (nr);
2043 
2044 	if (!nr)
2045 		return -ENOMEM;
2046 
2047 	if (!access_ok(VERIFY_WRITE, ubuf, nframes * CD_FRAMESIZE_RAW)) {
2048 		ret = -EFAULT;
2049 		goto out;
2050 	}
2051 
2052 	cgc.data_direction = CGC_DATA_READ;
2053 	while (nframes > 0) {
2054 		if (nr > nframes)
2055 			nr = nframes;
2056 
2057 		ret = cdrom_read_block(cdi, &cgc, lba, nr, 1, CD_FRAMESIZE_RAW);
2058 		if (ret)
2059 			break;
2060 		if (__copy_to_user(ubuf, cgc.buffer, CD_FRAMESIZE_RAW * nr)) {
2061 			ret = -EFAULT;
2062 			break;
2063 		}
2064 		ubuf += CD_FRAMESIZE_RAW * nr;
2065 		nframes -= nr;
2066 		lba += nr;
2067 	}
2068 out:
2069 	kfree(cgc.buffer);
2070 	return ret;
2071 }
2072 
2073 static int cdrom_read_cdda_bpc(struct cdrom_device_info *cdi, __u8 __user *ubuf,
2074 			       int lba, int nframes)
2075 {
2076 	struct request_queue *q = cdi->disk->queue;
2077 	struct request *rq;
2078 	struct bio *bio;
2079 	unsigned int len;
2080 	int nr, ret = 0;
2081 
2082 	if (!q)
2083 		return -ENXIO;
2084 
2085 	rq = blk_get_request(q, READ, GFP_KERNEL);
2086 	if (!rq)
2087 		return -ENOMEM;
2088 
2089 	cdi->last_sense = 0;
2090 
2091 	while (nframes) {
2092 		nr = nframes;
2093 		if (cdi->cdda_method == CDDA_BPC_SINGLE)
2094 			nr = 1;
2095 		if (nr * CD_FRAMESIZE_RAW > (q->max_sectors << 9))
2096 			nr = (q->max_sectors << 9) / CD_FRAMESIZE_RAW;
2097 
2098 		len = nr * CD_FRAMESIZE_RAW;
2099 
2100 		ret = blk_rq_map_user(q, rq, NULL, ubuf, len, GFP_KERNEL);
2101 		if (ret)
2102 			break;
2103 
2104 		rq->cmd[0] = GPCMD_READ_CD;
2105 		rq->cmd[1] = 1 << 2;
2106 		rq->cmd[2] = (lba >> 24) & 0xff;
2107 		rq->cmd[3] = (lba >> 16) & 0xff;
2108 		rq->cmd[4] = (lba >>  8) & 0xff;
2109 		rq->cmd[5] = lba & 0xff;
2110 		rq->cmd[6] = (nr >> 16) & 0xff;
2111 		rq->cmd[7] = (nr >>  8) & 0xff;
2112 		rq->cmd[8] = nr & 0xff;
2113 		rq->cmd[9] = 0xf8;
2114 
2115 		rq->cmd_len = 12;
2116 		rq->cmd_type = REQ_TYPE_BLOCK_PC;
2117 		rq->timeout = 60 * HZ;
2118 		bio = rq->bio;
2119 
2120 		if (blk_execute_rq(q, cdi->disk, rq, 0)) {
2121 			struct request_sense *s = rq->sense;
2122 			ret = -EIO;
2123 			cdi->last_sense = s->sense_key;
2124 		}
2125 
2126 		if (blk_rq_unmap_user(bio))
2127 			ret = -EFAULT;
2128 
2129 		if (ret)
2130 			break;
2131 
2132 		nframes -= nr;
2133 		lba += nr;
2134 		ubuf += len;
2135 	}
2136 
2137 	blk_put_request(rq);
2138 	return ret;
2139 }
2140 
2141 static int cdrom_read_cdda(struct cdrom_device_info *cdi, __u8 __user *ubuf,
2142 			   int lba, int nframes)
2143 {
2144 	int ret;
2145 
2146 	if (cdi->cdda_method == CDDA_OLD)
2147 		return cdrom_read_cdda_old(cdi, ubuf, lba, nframes);
2148 
2149 retry:
2150 	/*
2151 	 * for anything else than success and io error, we need to retry
2152 	 */
2153 	ret = cdrom_read_cdda_bpc(cdi, ubuf, lba, nframes);
2154 	if (!ret || ret != -EIO)
2155 		return ret;
2156 
2157 	/*
2158 	 * I've seen drives get sense 4/8/3 udma crc errors on multi
2159 	 * frame dma, so drop to single frame dma if we need to
2160 	 */
2161 	if (cdi->cdda_method == CDDA_BPC_FULL && nframes > 1) {
2162 		printk("cdrom: dropping to single frame dma\n");
2163 		cdi->cdda_method = CDDA_BPC_SINGLE;
2164 		goto retry;
2165 	}
2166 
2167 	/*
2168 	 * so we have an io error of some sort with multi frame dma. if the
2169 	 * condition wasn't a hardware error
2170 	 * problems, not for any error
2171 	 */
2172 	if (cdi->last_sense != 0x04 && cdi->last_sense != 0x0b)
2173 		return ret;
2174 
2175 	printk("cdrom: dropping to old style cdda (sense=%x)\n", cdi->last_sense);
2176 	cdi->cdda_method = CDDA_OLD;
2177 	return cdrom_read_cdda_old(cdi, ubuf, lba, nframes);
2178 }
2179 
2180 static int cdrom_ioctl_multisession(struct cdrom_device_info *cdi,
2181 		void __user *argp)
2182 {
2183 	struct cdrom_multisession ms_info;
2184 	u8 requested_format;
2185 	int ret;
2186 
2187 	cdinfo(CD_DO_IOCTL, "entering CDROMMULTISESSION\n");
2188 
2189 	if (!(cdi->ops->capability & CDC_MULTI_SESSION))
2190 		return -ENOSYS;
2191 
2192 	if (copy_from_user(&ms_info, argp, sizeof(ms_info)))
2193 		return -EFAULT;
2194 
2195 	requested_format = ms_info.addr_format;
2196 	if (requested_format != CDROM_MSF && requested_format != CDROM_LBA)
2197 		return -EINVAL;
2198 	ms_info.addr_format = CDROM_LBA;
2199 
2200 	ret = cdi->ops->get_last_session(cdi, &ms_info);
2201 	if (ret)
2202 		return ret;
2203 
2204 	sanitize_format(&ms_info.addr, &ms_info.addr_format, requested_format);
2205 
2206 	if (copy_to_user(argp, &ms_info, sizeof(ms_info)))
2207 		return -EFAULT;
2208 
2209 	cdinfo(CD_DO_IOCTL, "CDROMMULTISESSION successful\n");
2210 	return 0;
2211 }
2212 
2213 static int cdrom_ioctl_eject(struct cdrom_device_info *cdi)
2214 {
2215 	cdinfo(CD_DO_IOCTL, "entering CDROMEJECT\n");
2216 
2217 	if (!CDROM_CAN(CDC_OPEN_TRAY))
2218 		return -ENOSYS;
2219 	if (cdi->use_count != 1 || keeplocked)
2220 		return -EBUSY;
2221 	if (CDROM_CAN(CDC_LOCK)) {
2222 		int ret = cdi->ops->lock_door(cdi, 0);
2223 		if (ret)
2224 			return ret;
2225 	}
2226 
2227 	return cdi->ops->tray_move(cdi, 1);
2228 }
2229 
2230 static int cdrom_ioctl_closetray(struct cdrom_device_info *cdi)
2231 {
2232 	cdinfo(CD_DO_IOCTL, "entering CDROMCLOSETRAY\n");
2233 
2234 	if (!CDROM_CAN(CDC_CLOSE_TRAY))
2235 		return -ENOSYS;
2236 	return cdi->ops->tray_move(cdi, 0);
2237 }
2238 
2239 static int cdrom_ioctl_eject_sw(struct cdrom_device_info *cdi,
2240 		unsigned long arg)
2241 {
2242 	cdinfo(CD_DO_IOCTL, "entering CDROMEJECT_SW\n");
2243 
2244 	if (!CDROM_CAN(CDC_OPEN_TRAY))
2245 		return -ENOSYS;
2246 	if (keeplocked)
2247 		return -EBUSY;
2248 
2249 	cdi->options &= ~(CDO_AUTO_CLOSE | CDO_AUTO_EJECT);
2250 	if (arg)
2251 		cdi->options |= CDO_AUTO_CLOSE | CDO_AUTO_EJECT;
2252 	return 0;
2253 }
2254 
2255 static int cdrom_ioctl_media_changed(struct cdrom_device_info *cdi,
2256 		unsigned long arg)
2257 {
2258 	struct cdrom_changer_info *info;
2259 	int ret;
2260 
2261 	cdinfo(CD_DO_IOCTL, "entering CDROM_MEDIA_CHANGED\n");
2262 
2263 	if (!CDROM_CAN(CDC_MEDIA_CHANGED))
2264 		return -ENOSYS;
2265 
2266 	/* cannot select disc or select current disc */
2267 	if (!CDROM_CAN(CDC_SELECT_DISC) || arg == CDSL_CURRENT)
2268 		return media_changed(cdi, 1);
2269 
2270 	if ((unsigned int)arg >= cdi->capacity)
2271 		return -EINVAL;
2272 
2273 	info = kmalloc(sizeof(*info), GFP_KERNEL);
2274 	if (!info)
2275 		return -ENOMEM;
2276 
2277 	ret = cdrom_read_mech_status(cdi, info);
2278 	if (!ret)
2279 		ret = info->slots[arg].change;
2280 	kfree(info);
2281 	return ret;
2282 }
2283 
2284 static int cdrom_ioctl_set_options(struct cdrom_device_info *cdi,
2285 		unsigned long arg)
2286 {
2287 	cdinfo(CD_DO_IOCTL, "entering CDROM_SET_OPTIONS\n");
2288 
2289 	/*
2290 	 * Options need to be in sync with capability.
2291 	 * Too late for that, so we have to check each one separately.
2292 	 */
2293 	switch (arg) {
2294 	case CDO_USE_FFLAGS:
2295 	case CDO_CHECK_TYPE:
2296 		break;
2297 	case CDO_LOCK:
2298 		if (!CDROM_CAN(CDC_LOCK))
2299 			return -ENOSYS;
2300 		break;
2301 	case 0:
2302 		return cdi->options;
2303 	/* default is basically CDO_[AUTO_CLOSE|AUTO_EJECT] */
2304 	default:
2305 		if (!CDROM_CAN(arg))
2306 			return -ENOSYS;
2307 	}
2308 	cdi->options |= (int) arg;
2309 	return cdi->options;
2310 }
2311 
2312 static int cdrom_ioctl_clear_options(struct cdrom_device_info *cdi,
2313 		unsigned long arg)
2314 {
2315 	cdinfo(CD_DO_IOCTL, "entering CDROM_CLEAR_OPTIONS\n");
2316 
2317 	cdi->options &= ~(int) arg;
2318 	return cdi->options;
2319 }
2320 
2321 static int cdrom_ioctl_select_speed(struct cdrom_device_info *cdi,
2322 		unsigned long arg)
2323 {
2324 	cdinfo(CD_DO_IOCTL, "entering CDROM_SELECT_SPEED\n");
2325 
2326 	if (!CDROM_CAN(CDC_SELECT_SPEED))
2327 		return -ENOSYS;
2328 	return cdi->ops->select_speed(cdi, arg);
2329 }
2330 
2331 static int cdrom_ioctl_select_disc(struct cdrom_device_info *cdi,
2332 		unsigned long arg)
2333 {
2334 	cdinfo(CD_DO_IOCTL, "entering CDROM_SELECT_DISC\n");
2335 
2336 	if (!CDROM_CAN(CDC_SELECT_DISC))
2337 		return -ENOSYS;
2338 
2339 	if (arg != CDSL_CURRENT && arg != CDSL_NONE) {
2340 		if ((int)arg >= cdi->capacity)
2341 			return -EINVAL;
2342 	}
2343 
2344 	/*
2345 	 * ->select_disc is a hook to allow a driver-specific way of
2346 	 * seleting disc.  However, since there is no equivalent hook for
2347 	 * cdrom_slot_status this may not actually be useful...
2348 	 */
2349 	if (cdi->ops->select_disc)
2350 		return cdi->ops->select_disc(cdi, arg);
2351 
2352 	cdinfo(CD_CHANGER, "Using generic cdrom_select_disc()\n");
2353 	return cdrom_select_disc(cdi, arg);
2354 }
2355 
2356 static int cdrom_ioctl_reset(struct cdrom_device_info *cdi,
2357 		struct block_device *bdev)
2358 {
2359 	cdinfo(CD_DO_IOCTL, "entering CDROM_RESET\n");
2360 
2361 	if (!capable(CAP_SYS_ADMIN))
2362 		return -EACCES;
2363 	if (!CDROM_CAN(CDC_RESET))
2364 		return -ENOSYS;
2365 	invalidate_bdev(bdev);
2366 	return cdi->ops->reset(cdi);
2367 }
2368 
2369 static int cdrom_ioctl_lock_door(struct cdrom_device_info *cdi,
2370 		unsigned long arg)
2371 {
2372 	cdinfo(CD_DO_IOCTL, "%socking door.\n", arg ? "L" : "Unl");
2373 
2374 	if (!CDROM_CAN(CDC_LOCK))
2375 		return -EDRIVE_CANT_DO_THIS;
2376 
2377 	keeplocked = arg ? 1 : 0;
2378 
2379 	/*
2380 	 * Don't unlock the door on multiple opens by default, but allow
2381 	 * root to do so.
2382 	 */
2383 	if (cdi->use_count != 1 && !arg && !capable(CAP_SYS_ADMIN))
2384 		return -EBUSY;
2385 	return cdi->ops->lock_door(cdi, arg);
2386 }
2387 
2388 static int cdrom_ioctl_debug(struct cdrom_device_info *cdi,
2389 		unsigned long arg)
2390 {
2391 	cdinfo(CD_DO_IOCTL, "%sabling debug.\n", arg ? "En" : "Dis");
2392 
2393 	if (!capable(CAP_SYS_ADMIN))
2394 		return -EACCES;
2395 	debug = arg ? 1 : 0;
2396 	return debug;
2397 }
2398 
2399 static int cdrom_ioctl_get_capability(struct cdrom_device_info *cdi)
2400 {
2401 	cdinfo(CD_DO_IOCTL, "entering CDROM_GET_CAPABILITY\n");
2402 	return (cdi->ops->capability & ~cdi->mask);
2403 }
2404 
2405 /*
2406  * The following function is implemented, although very few audio
2407  * discs give Universal Product Code information, which should just be
2408  * the Medium Catalog Number on the box.  Note, that the way the code
2409  * is written on the CD is /not/ uniform across all discs!
2410  */
2411 static int cdrom_ioctl_get_mcn(struct cdrom_device_info *cdi,
2412 		void __user *argp)
2413 {
2414 	struct cdrom_mcn mcn;
2415 	int ret;
2416 
2417 	cdinfo(CD_DO_IOCTL, "entering CDROM_GET_MCN\n");
2418 
2419 	if (!(cdi->ops->capability & CDC_MCN))
2420 		return -ENOSYS;
2421 	ret = cdi->ops->get_mcn(cdi, &mcn);
2422 	if (ret)
2423 		return ret;
2424 
2425 	if (copy_to_user(argp, &mcn, sizeof(mcn)))
2426 		return -EFAULT;
2427 	cdinfo(CD_DO_IOCTL, "CDROM_GET_MCN successful\n");
2428 	return 0;
2429 }
2430 
2431 static int cdrom_ioctl_drive_status(struct cdrom_device_info *cdi,
2432 		unsigned long arg)
2433 {
2434 	cdinfo(CD_DO_IOCTL, "entering CDROM_DRIVE_STATUS\n");
2435 
2436 	if (!(cdi->ops->capability & CDC_DRIVE_STATUS))
2437 		return -ENOSYS;
2438 	if (!CDROM_CAN(CDC_SELECT_DISC) ||
2439 	    (arg == CDSL_CURRENT || arg == CDSL_NONE))
2440 		return cdi->ops->drive_status(cdi, CDSL_CURRENT);
2441 	if (((int)arg >= cdi->capacity))
2442 		return -EINVAL;
2443 	return cdrom_slot_status(cdi, arg);
2444 }
2445 
2446 /*
2447  * Ok, this is where problems start.  The current interface for the
2448  * CDROM_DISC_STATUS ioctl is flawed.  It makes the false assumption that
2449  * CDs are all CDS_DATA_1 or all CDS_AUDIO, etc.  Unfortunatly, while this
2450  * is often the case, it is also very common for CDs to have some tracks
2451  * with data, and some tracks with audio.  Just because I feel like it,
2452  * I declare the following to be the best way to cope.  If the CD has ANY
2453  * data tracks on it, it will be returned as a data CD.  If it has any XA
2454  * tracks, I will return it as that.  Now I could simplify this interface
2455  * by combining these  returns with the above, but this more clearly
2456  * demonstrates the problem with the current interface.  Too bad this
2457  * wasn't designed to use bitmasks...         -Erik
2458  *
2459  * Well, now we have the option CDS_MIXED: a mixed-type CD.
2460  * User level programmers might feel the ioctl is not very useful.
2461  *					---david
2462  */
2463 static int cdrom_ioctl_disc_status(struct cdrom_device_info *cdi)
2464 {
2465 	tracktype tracks;
2466 
2467 	cdinfo(CD_DO_IOCTL, "entering CDROM_DISC_STATUS\n");
2468 
2469 	cdrom_count_tracks(cdi, &tracks);
2470 	if (tracks.error)
2471 		return tracks.error;
2472 
2473 	/* Policy mode on */
2474 	if (tracks.audio > 0) {
2475 		if (!tracks.data && !tracks.cdi && !tracks.xa)
2476 			return CDS_AUDIO;
2477 		else
2478 			return CDS_MIXED;
2479 	}
2480 
2481 	if (tracks.cdi > 0)
2482 		return CDS_XA_2_2;
2483 	if (tracks.xa > 0)
2484 		return CDS_XA_2_1;
2485 	if (tracks.data > 0)
2486 		return CDS_DATA_1;
2487 	/* Policy mode off */
2488 
2489 	cdinfo(CD_WARNING,"This disc doesn't have any tracks I recognize!\n");
2490 	return CDS_NO_INFO;
2491 }
2492 
2493 static int cdrom_ioctl_changer_nslots(struct cdrom_device_info *cdi)
2494 {
2495 	cdinfo(CD_DO_IOCTL, "entering CDROM_CHANGER_NSLOTS\n");
2496 	return cdi->capacity;
2497 }
2498 
2499 static int cdrom_ioctl_get_subchnl(struct cdrom_device_info *cdi,
2500 		void __user *argp)
2501 {
2502 	struct cdrom_subchnl q;
2503 	u8 requested, back;
2504 	int ret;
2505 
2506 	/* cdinfo(CD_DO_IOCTL,"entering CDROMSUBCHNL\n");*/
2507 
2508 	if (copy_from_user(&q, argp, sizeof(q)))
2509 		return -EFAULT;
2510 
2511 	requested = q.cdsc_format;
2512 	if (requested != CDROM_MSF && requested != CDROM_LBA)
2513 		return -EINVAL;
2514 	q.cdsc_format = CDROM_MSF;
2515 
2516 	ret = cdi->ops->audio_ioctl(cdi, CDROMSUBCHNL, &q);
2517 	if (ret)
2518 		return ret;
2519 
2520 	back = q.cdsc_format; /* local copy */
2521 	sanitize_format(&q.cdsc_absaddr, &back, requested);
2522 	sanitize_format(&q.cdsc_reladdr, &q.cdsc_format, requested);
2523 
2524 	if (copy_to_user(argp, &q, sizeof(q)))
2525 		return -EFAULT;
2526 	/* cdinfo(CD_DO_IOCTL, "CDROMSUBCHNL successful\n"); */
2527 	return 0;
2528 }
2529 
2530 static int cdrom_ioctl_read_tochdr(struct cdrom_device_info *cdi,
2531 		void __user *argp)
2532 {
2533 	struct cdrom_tochdr header;
2534 	int ret;
2535 
2536 	/* cdinfo(CD_DO_IOCTL, "entering CDROMREADTOCHDR\n"); */
2537 
2538 	if (copy_from_user(&header, argp, sizeof(header)))
2539 		return -EFAULT;
2540 
2541 	ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCHDR, &header);
2542 	if (ret)
2543 		return ret;
2544 
2545 	if (copy_to_user(argp, &header, sizeof(header)))
2546 		return -EFAULT;
2547 	/* cdinfo(CD_DO_IOCTL, "CDROMREADTOCHDR successful\n"); */
2548 	return 0;
2549 }
2550 
2551 static int cdrom_ioctl_read_tocentry(struct cdrom_device_info *cdi,
2552 		void __user *argp)
2553 {
2554 	struct cdrom_tocentry entry;
2555 	u8 requested_format;
2556 	int ret;
2557 
2558 	/* cdinfo(CD_DO_IOCTL, "entering CDROMREADTOCENTRY\n"); */
2559 
2560 	if (copy_from_user(&entry, argp, sizeof(entry)))
2561 		return -EFAULT;
2562 
2563 	requested_format = entry.cdte_format;
2564 	if (requested_format != CDROM_MSF && requested_format != CDROM_LBA)
2565 		return -EINVAL;
2566 	/* make interface to low-level uniform */
2567 	entry.cdte_format = CDROM_MSF;
2568 	ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCENTRY, &entry);
2569 	if (ret)
2570 		return ret;
2571 	sanitize_format(&entry.cdte_addr, &entry.cdte_format, requested_format);
2572 
2573 	if (copy_to_user(argp, &entry, sizeof(entry)))
2574 		return -EFAULT;
2575 	/* cdinfo(CD_DO_IOCTL, "CDROMREADTOCENTRY successful\n"); */
2576 	return 0;
2577 }
2578 
2579 static int cdrom_ioctl_play_msf(struct cdrom_device_info *cdi,
2580 		void __user *argp)
2581 {
2582 	struct cdrom_msf msf;
2583 
2584 	cdinfo(CD_DO_IOCTL, "entering CDROMPLAYMSF\n");
2585 
2586 	if (!CDROM_CAN(CDC_PLAY_AUDIO))
2587 		return -ENOSYS;
2588 	if (copy_from_user(&msf, argp, sizeof(msf)))
2589 		return -EFAULT;
2590 	return cdi->ops->audio_ioctl(cdi, CDROMPLAYMSF, &msf);
2591 }
2592 
2593 static int cdrom_ioctl_play_trkind(struct cdrom_device_info *cdi,
2594 		void __user *argp)
2595 {
2596 	struct cdrom_ti ti;
2597 	int ret;
2598 
2599 	cdinfo(CD_DO_IOCTL, "entering CDROMPLAYTRKIND\n");
2600 
2601 	if (!CDROM_CAN(CDC_PLAY_AUDIO))
2602 		return -ENOSYS;
2603 	if (copy_from_user(&ti, argp, sizeof(ti)))
2604 		return -EFAULT;
2605 
2606 	ret = check_for_audio_disc(cdi, cdi->ops);
2607 	if (ret)
2608 		return ret;
2609 	return cdi->ops->audio_ioctl(cdi, CDROMPLAYTRKIND, &ti);
2610 }
2611 static int cdrom_ioctl_volctrl(struct cdrom_device_info *cdi,
2612 		void __user *argp)
2613 {
2614 	struct cdrom_volctrl volume;
2615 
2616 	cdinfo(CD_DO_IOCTL, "entering CDROMVOLCTRL\n");
2617 
2618 	if (!CDROM_CAN(CDC_PLAY_AUDIO))
2619 		return -ENOSYS;
2620 	if (copy_from_user(&volume, argp, sizeof(volume)))
2621 		return -EFAULT;
2622 	return cdi->ops->audio_ioctl(cdi, CDROMVOLCTRL, &volume);
2623 }
2624 
2625 static int cdrom_ioctl_volread(struct cdrom_device_info *cdi,
2626 		void __user *argp)
2627 {
2628 	struct cdrom_volctrl volume;
2629 	int ret;
2630 
2631 	cdinfo(CD_DO_IOCTL, "entering CDROMVOLREAD\n");
2632 
2633 	if (!CDROM_CAN(CDC_PLAY_AUDIO))
2634 		return -ENOSYS;
2635 
2636 	ret = cdi->ops->audio_ioctl(cdi, CDROMVOLREAD, &volume);
2637 	if (ret)
2638 		return ret;
2639 
2640 	if (copy_to_user(argp, &volume, sizeof(volume)))
2641 		return -EFAULT;
2642 	return 0;
2643 }
2644 
2645 static int cdrom_ioctl_audioctl(struct cdrom_device_info *cdi,
2646 		unsigned int cmd)
2647 {
2648 	int ret;
2649 
2650 	cdinfo(CD_DO_IOCTL, "doing audio ioctl (start/stop/pause/resume)\n");
2651 
2652 	if (!CDROM_CAN(CDC_PLAY_AUDIO))
2653 		return -ENOSYS;
2654 	ret = check_for_audio_disc(cdi, cdi->ops);
2655 	if (ret)
2656 		return ret;
2657 	return cdi->ops->audio_ioctl(cdi, cmd, NULL);
2658 }
2659 
2660 /*
2661  * Just about every imaginable ioctl is supported in the Uniform layer
2662  * these days.
2663  * ATAPI / SCSI specific code now mainly resides in mmc_ioctl().
2664  */
2665 int cdrom_ioctl(struct file * file, struct cdrom_device_info *cdi,
2666 		struct inode *ip, unsigned int cmd, unsigned long arg)
2667 {
2668 	void __user *argp = (void __user *)arg;
2669 	int ret;
2670 	struct gendisk *disk = ip->i_bdev->bd_disk;
2671 
2672 	/*
2673 	 * Try the generic SCSI command ioctl's first.
2674 	 */
2675 	ret = scsi_cmd_ioctl(file, disk->queue, disk, cmd, argp);
2676 	if (ret != -ENOTTY)
2677 		return ret;
2678 
2679 	switch (cmd) {
2680 	case CDROMMULTISESSION:
2681 		return cdrom_ioctl_multisession(cdi, argp);
2682 	case CDROMEJECT:
2683 		return cdrom_ioctl_eject(cdi);
2684 	case CDROMCLOSETRAY:
2685 		return cdrom_ioctl_closetray(cdi);
2686 	case CDROMEJECT_SW:
2687 		return cdrom_ioctl_eject_sw(cdi, arg);
2688 	case CDROM_MEDIA_CHANGED:
2689 		return cdrom_ioctl_media_changed(cdi, arg);
2690 	case CDROM_SET_OPTIONS:
2691 		return cdrom_ioctl_set_options(cdi, arg);
2692 	case CDROM_CLEAR_OPTIONS:
2693 		return cdrom_ioctl_clear_options(cdi, arg);
2694 	case CDROM_SELECT_SPEED:
2695 		return cdrom_ioctl_select_speed(cdi, arg);
2696 	case CDROM_SELECT_DISC:
2697 		return cdrom_ioctl_select_disc(cdi, arg);
2698 	case CDROMRESET:
2699 		return cdrom_ioctl_reset(cdi, ip->i_bdev);
2700 	case CDROM_LOCKDOOR:
2701 		return cdrom_ioctl_lock_door(cdi, arg);
2702 	case CDROM_DEBUG:
2703 		return cdrom_ioctl_debug(cdi, arg);
2704 	case CDROM_GET_CAPABILITY:
2705 		return cdrom_ioctl_get_capability(cdi);
2706 	case CDROM_GET_MCN:
2707 		return cdrom_ioctl_get_mcn(cdi, argp);
2708 	case CDROM_DRIVE_STATUS:
2709 		return cdrom_ioctl_drive_status(cdi, arg);
2710 	case CDROM_DISC_STATUS:
2711 		return cdrom_ioctl_disc_status(cdi);
2712 	case CDROM_CHANGER_NSLOTS:
2713 		return cdrom_ioctl_changer_nslots(cdi);
2714 	}
2715 
2716 	/*
2717 	 * Use the ioctls that are implemented through the generic_packet()
2718 	 * interface. this may look at bit funny, but if -ENOTTY is
2719 	 * returned that particular ioctl is not implemented and we
2720 	 * let it go through the device specific ones.
2721 	 */
2722 	if (CDROM_CAN(CDC_GENERIC_PACKET)) {
2723 		ret = mmc_ioctl(cdi, cmd, arg);
2724 		if (ret != -ENOTTY)
2725 			return ret;
2726 	}
2727 
2728 	/*
2729 	 * Note: most of the cdinfo() calls are commented out here,
2730 	 * because they fill up the sys log when CD players poll
2731 	 * the drive.
2732 	 */
2733 	switch (cmd) {
2734 	case CDROMSUBCHNL:
2735 		return cdrom_ioctl_get_subchnl(cdi, argp);
2736 	case CDROMREADTOCHDR:
2737 		return cdrom_ioctl_read_tochdr(cdi, argp);
2738 	case CDROMREADTOCENTRY:
2739 		return cdrom_ioctl_read_tocentry(cdi, argp);
2740 	case CDROMPLAYMSF:
2741 		return cdrom_ioctl_play_msf(cdi, argp);
2742 	case CDROMPLAYTRKIND:
2743 		return cdrom_ioctl_play_trkind(cdi, argp);
2744 	case CDROMVOLCTRL:
2745 		return cdrom_ioctl_volctrl(cdi, argp);
2746 	case CDROMVOLREAD:
2747 		return cdrom_ioctl_volread(cdi, argp);
2748 	case CDROMSTART:
2749 	case CDROMSTOP:
2750 	case CDROMPAUSE:
2751 	case CDROMRESUME:
2752 		return cdrom_ioctl_audioctl(cdi, cmd);
2753 	}
2754 
2755 	return -ENOSYS;
2756 }
2757 
2758 /*
2759  * Required when we need to use READ_10 to issue other than 2048 block
2760  * reads
2761  */
2762 static int cdrom_switch_blocksize(struct cdrom_device_info *cdi, int size)
2763 {
2764 	struct cdrom_device_ops *cdo = cdi->ops;
2765 	struct packet_command cgc;
2766 	struct modesel_head mh;
2767 
2768 	memset(&mh, 0, sizeof(mh));
2769 	mh.block_desc_length = 0x08;
2770 	mh.block_length_med = (size >> 8) & 0xff;
2771 	mh.block_length_lo = size & 0xff;
2772 
2773 	memset(&cgc, 0, sizeof(cgc));
2774 	cgc.cmd[0] = 0x15;
2775 	cgc.cmd[1] = 1 << 4;
2776 	cgc.cmd[4] = 12;
2777 	cgc.buflen = sizeof(mh);
2778 	cgc.buffer = (char *) &mh;
2779 	cgc.data_direction = CGC_DATA_WRITE;
2780 	mh.block_desc_length = 0x08;
2781 	mh.block_length_med = (size >> 8) & 0xff;
2782 	mh.block_length_lo = size & 0xff;
2783 
2784 	return cdo->generic_packet(cdi, &cgc);
2785 }
2786 
2787 static int mmc_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
2788 		     unsigned long arg)
2789 {
2790 	struct cdrom_device_ops *cdo = cdi->ops;
2791 	struct packet_command cgc;
2792 	struct request_sense sense;
2793 	unsigned char buffer[32];
2794 	int ret = 0;
2795 
2796 	memset(&cgc, 0, sizeof(cgc));
2797 
2798 	/* build a unified command and queue it through
2799 	   cdo->generic_packet() */
2800 	switch (cmd) {
2801 	case CDROMREADRAW:
2802 	case CDROMREADMODE1:
2803 	case CDROMREADMODE2: {
2804 		struct cdrom_msf msf;
2805 		int blocksize = 0, format = 0, lba;
2806 
2807 		switch (cmd) {
2808 		case CDROMREADRAW:
2809 			blocksize = CD_FRAMESIZE_RAW;
2810 			break;
2811 		case CDROMREADMODE1:
2812 			blocksize = CD_FRAMESIZE;
2813 			format = 2;
2814 			break;
2815 		case CDROMREADMODE2:
2816 			blocksize = CD_FRAMESIZE_RAW0;
2817 			break;
2818 		}
2819 		IOCTL_IN(arg, struct cdrom_msf, msf);
2820 		lba = msf_to_lba(msf.cdmsf_min0,msf.cdmsf_sec0,msf.cdmsf_frame0);
2821 		/* FIXME: we need upper bound checking, too!! */
2822 		if (lba < 0)
2823 			return -EINVAL;
2824 		cgc.buffer = kmalloc(blocksize, GFP_KERNEL);
2825 		if (cgc.buffer == NULL)
2826 			return -ENOMEM;
2827 		memset(&sense, 0, sizeof(sense));
2828 		cgc.sense = &sense;
2829 		cgc.data_direction = CGC_DATA_READ;
2830 		ret = cdrom_read_block(cdi, &cgc, lba, 1, format, blocksize);
2831 		if (ret && sense.sense_key==0x05 && sense.asc==0x20 && sense.ascq==0x00) {
2832 			/*
2833 			 * SCSI-II devices are not required to support
2834 			 * READ_CD, so let's try switching block size
2835 			 */
2836 			/* FIXME: switch back again... */
2837 			if ((ret = cdrom_switch_blocksize(cdi, blocksize))) {
2838 				kfree(cgc.buffer);
2839 				return ret;
2840 			}
2841 			cgc.sense = NULL;
2842 			ret = cdrom_read_cd(cdi, &cgc, lba, blocksize, 1);
2843 			ret |= cdrom_switch_blocksize(cdi, blocksize);
2844 		}
2845 		if (!ret && copy_to_user((char __user *)arg, cgc.buffer, blocksize))
2846 			ret = -EFAULT;
2847 		kfree(cgc.buffer);
2848 		return ret;
2849 		}
2850 	case CDROMREADAUDIO: {
2851 		struct cdrom_read_audio ra;
2852 		int lba;
2853 
2854 		IOCTL_IN(arg, struct cdrom_read_audio, ra);
2855 
2856 		if (ra.addr_format == CDROM_MSF)
2857 			lba = msf_to_lba(ra.addr.msf.minute,
2858 					 ra.addr.msf.second,
2859 					 ra.addr.msf.frame);
2860 		else if (ra.addr_format == CDROM_LBA)
2861 			lba = ra.addr.lba;
2862 		else
2863 			return -EINVAL;
2864 
2865 		/* FIXME: we need upper bound checking, too!! */
2866 		if (lba < 0 || ra.nframes <= 0 || ra.nframes > CD_FRAMES)
2867 			return -EINVAL;
2868 
2869 		return cdrom_read_cdda(cdi, ra.buf, lba, ra.nframes);
2870 		}
2871 	case CDROMSUBCHNL: {
2872 		struct cdrom_subchnl q;
2873 		u_char requested, back;
2874 		IOCTL_IN(arg, struct cdrom_subchnl, q);
2875 		requested = q.cdsc_format;
2876 		if (!((requested == CDROM_MSF) ||
2877 		      (requested == CDROM_LBA)))
2878 			return -EINVAL;
2879 		q.cdsc_format = CDROM_MSF;
2880 		if ((ret = cdrom_read_subchannel(cdi, &q, 0)))
2881 			return ret;
2882 		back = q.cdsc_format; /* local copy */
2883 		sanitize_format(&q.cdsc_absaddr, &back, requested);
2884 		sanitize_format(&q.cdsc_reladdr, &q.cdsc_format, requested);
2885 		IOCTL_OUT(arg, struct cdrom_subchnl, q);
2886 		/* cdinfo(CD_DO_IOCTL, "CDROMSUBCHNL successful\n"); */
2887 		return 0;
2888 		}
2889 	case CDROMPLAYMSF: {
2890 		struct cdrom_msf msf;
2891 		cdinfo(CD_DO_IOCTL, "entering CDROMPLAYMSF\n");
2892 		IOCTL_IN(arg, struct cdrom_msf, msf);
2893 		cgc.cmd[0] = GPCMD_PLAY_AUDIO_MSF;
2894 		cgc.cmd[3] = msf.cdmsf_min0;
2895 		cgc.cmd[4] = msf.cdmsf_sec0;
2896 		cgc.cmd[5] = msf.cdmsf_frame0;
2897 		cgc.cmd[6] = msf.cdmsf_min1;
2898 		cgc.cmd[7] = msf.cdmsf_sec1;
2899 		cgc.cmd[8] = msf.cdmsf_frame1;
2900 		cgc.data_direction = CGC_DATA_NONE;
2901 		return cdo->generic_packet(cdi, &cgc);
2902 		}
2903 	case CDROMPLAYBLK: {
2904 		struct cdrom_blk blk;
2905 		cdinfo(CD_DO_IOCTL, "entering CDROMPLAYBLK\n");
2906 		IOCTL_IN(arg, struct cdrom_blk, blk);
2907 		cgc.cmd[0] = GPCMD_PLAY_AUDIO_10;
2908 		cgc.cmd[2] = (blk.from >> 24) & 0xff;
2909 		cgc.cmd[3] = (blk.from >> 16) & 0xff;
2910 		cgc.cmd[4] = (blk.from >>  8) & 0xff;
2911 		cgc.cmd[5] = blk.from & 0xff;
2912 		cgc.cmd[7] = (blk.len >> 8) & 0xff;
2913 		cgc.cmd[8] = blk.len & 0xff;
2914 		cgc.data_direction = CGC_DATA_NONE;
2915 		return cdo->generic_packet(cdi, &cgc);
2916 		}
2917 	case CDROMVOLCTRL:
2918 	case CDROMVOLREAD: {
2919 		struct cdrom_volctrl volctrl;
2920 		char mask[sizeof(buffer)];
2921 		unsigned short offset;
2922 
2923 		cdinfo(CD_DO_IOCTL, "entering CDROMVOLUME\n");
2924 
2925 		IOCTL_IN(arg, struct cdrom_volctrl, volctrl);
2926 
2927 		cgc.buffer = buffer;
2928 		cgc.buflen = 24;
2929 		if ((ret = cdrom_mode_sense(cdi, &cgc, GPMODE_AUDIO_CTL_PAGE, 0)))
2930 		    return ret;
2931 
2932 		/* originally the code depended on buffer[1] to determine
2933 		   how much data is available for transfer. buffer[1] is
2934 		   unfortunately ambigious and the only reliable way seem
2935 		   to be to simply skip over the block descriptor... */
2936 		offset = 8 + be16_to_cpu(*(__be16 *)(buffer+6));
2937 
2938 		if (offset + 16 > sizeof(buffer))
2939 			return -E2BIG;
2940 
2941 		if (offset + 16 > cgc.buflen) {
2942 			cgc.buflen = offset+16;
2943 			ret = cdrom_mode_sense(cdi, &cgc,
2944 						GPMODE_AUDIO_CTL_PAGE, 0);
2945 			if (ret)
2946 				return ret;
2947 		}
2948 
2949 		/* sanity check */
2950 		if ((buffer[offset] & 0x3f) != GPMODE_AUDIO_CTL_PAGE ||
2951 				buffer[offset+1] < 14)
2952 			return -EINVAL;
2953 
2954 		/* now we have the current volume settings. if it was only
2955 		   a CDROMVOLREAD, return these values */
2956 		if (cmd == CDROMVOLREAD) {
2957 			volctrl.channel0 = buffer[offset+9];
2958 			volctrl.channel1 = buffer[offset+11];
2959 			volctrl.channel2 = buffer[offset+13];
2960 			volctrl.channel3 = buffer[offset+15];
2961 			IOCTL_OUT(arg, struct cdrom_volctrl, volctrl);
2962 			return 0;
2963 		}
2964 
2965 		/* get the volume mask */
2966 		cgc.buffer = mask;
2967 		if ((ret = cdrom_mode_sense(cdi, &cgc,
2968 				GPMODE_AUDIO_CTL_PAGE, 1)))
2969 			return ret;
2970 
2971 		buffer[offset+9] = volctrl.channel0 & mask[offset+9];
2972 		buffer[offset+11] = volctrl.channel1 & mask[offset+11];
2973 		buffer[offset+13] = volctrl.channel2 & mask[offset+13];
2974 		buffer[offset+15] = volctrl.channel3 & mask[offset+15];
2975 
2976 		/* set volume */
2977 		cgc.buffer = buffer + offset - 8;
2978 		memset(cgc.buffer, 0, 8);
2979 		return cdrom_mode_select(cdi, &cgc);
2980 		}
2981 
2982 	case CDROMSTART:
2983 	case CDROMSTOP: {
2984 		cdinfo(CD_DO_IOCTL, "entering CDROMSTART/CDROMSTOP\n");
2985 		cgc.cmd[0] = GPCMD_START_STOP_UNIT;
2986 		cgc.cmd[1] = 1;
2987 		cgc.cmd[4] = (cmd == CDROMSTART) ? 1 : 0;
2988 		cgc.data_direction = CGC_DATA_NONE;
2989 		return cdo->generic_packet(cdi, &cgc);
2990 		}
2991 
2992 	case CDROMPAUSE:
2993 	case CDROMRESUME: {
2994 		cdinfo(CD_DO_IOCTL, "entering CDROMPAUSE/CDROMRESUME\n");
2995 		cgc.cmd[0] = GPCMD_PAUSE_RESUME;
2996 		cgc.cmd[8] = (cmd == CDROMRESUME) ? 1 : 0;
2997 		cgc.data_direction = CGC_DATA_NONE;
2998 		return cdo->generic_packet(cdi, &cgc);
2999 		}
3000 
3001 	case DVD_READ_STRUCT: {
3002 		dvd_struct *s;
3003 		int size = sizeof(dvd_struct);
3004 		if (!CDROM_CAN(CDC_DVD))
3005 			return -ENOSYS;
3006 		if ((s = kmalloc(size, GFP_KERNEL)) == NULL)
3007 			return -ENOMEM;
3008 		cdinfo(CD_DO_IOCTL, "entering DVD_READ_STRUCT\n");
3009 		if (copy_from_user(s, (dvd_struct __user *)arg, size)) {
3010 			kfree(s);
3011 			return -EFAULT;
3012 		}
3013 		if ((ret = dvd_read_struct(cdi, s))) {
3014 			kfree(s);
3015 			return ret;
3016 		}
3017 		if (copy_to_user((dvd_struct __user *)arg, s, size))
3018 			ret = -EFAULT;
3019 		kfree(s);
3020 		return ret;
3021 		}
3022 
3023 	case DVD_AUTH: {
3024 		dvd_authinfo ai;
3025 		if (!CDROM_CAN(CDC_DVD))
3026 			return -ENOSYS;
3027 		cdinfo(CD_DO_IOCTL, "entering DVD_AUTH\n");
3028 		IOCTL_IN(arg, dvd_authinfo, ai);
3029 		if ((ret = dvd_do_auth (cdi, &ai)))
3030 			return ret;
3031 		IOCTL_OUT(arg, dvd_authinfo, ai);
3032 		return 0;
3033 		}
3034 
3035 	case CDROM_NEXT_WRITABLE: {
3036 		long next = 0;
3037 		cdinfo(CD_DO_IOCTL, "entering CDROM_NEXT_WRITABLE\n");
3038 		if ((ret = cdrom_get_next_writable(cdi, &next)))
3039 			return ret;
3040 		IOCTL_OUT(arg, long, next);
3041 		return 0;
3042 		}
3043 	case CDROM_LAST_WRITTEN: {
3044 		long last = 0;
3045 		cdinfo(CD_DO_IOCTL, "entering CDROM_LAST_WRITTEN\n");
3046 		if ((ret = cdrom_get_last_written(cdi, &last)))
3047 			return ret;
3048 		IOCTL_OUT(arg, long, last);
3049 		return 0;
3050 		}
3051 	} /* switch */
3052 
3053 	return -ENOTTY;
3054 }
3055 
3056 static int cdrom_get_track_info(struct cdrom_device_info *cdi, __u16 track, __u8 type,
3057 			 track_information *ti)
3058 {
3059 	struct cdrom_device_ops *cdo = cdi->ops;
3060 	struct packet_command cgc;
3061 	int ret, buflen;
3062 
3063 	init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
3064 	cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
3065 	cgc.cmd[1] = type & 3;
3066 	cgc.cmd[4] = (track & 0xff00) >> 8;
3067 	cgc.cmd[5] = track & 0xff;
3068 	cgc.cmd[8] = 8;
3069 	cgc.quiet = 1;
3070 
3071 	if ((ret = cdo->generic_packet(cdi, &cgc)))
3072 		return ret;
3073 
3074 	buflen = be16_to_cpu(ti->track_information_length) +
3075 		     sizeof(ti->track_information_length);
3076 
3077 	if (buflen > sizeof(track_information))
3078 		buflen = sizeof(track_information);
3079 
3080 	cgc.cmd[8] = cgc.buflen = buflen;
3081 	if ((ret = cdo->generic_packet(cdi, &cgc)))
3082 		return ret;
3083 
3084 	/* return actual fill size */
3085 	return buflen;
3086 }
3087 
3088 /* requires CD R/RW */
3089 static int cdrom_get_disc_info(struct cdrom_device_info *cdi, disc_information *di)
3090 {
3091 	struct cdrom_device_ops *cdo = cdi->ops;
3092 	struct packet_command cgc;
3093 	int ret, buflen;
3094 
3095 	/* set up command and get the disc info */
3096 	init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
3097 	cgc.cmd[0] = GPCMD_READ_DISC_INFO;
3098 	cgc.cmd[8] = cgc.buflen = 2;
3099 	cgc.quiet = 1;
3100 
3101 	if ((ret = cdo->generic_packet(cdi, &cgc)))
3102 		return ret;
3103 
3104 	/* not all drives have the same disc_info length, so requeue
3105 	 * packet with the length the drive tells us it can supply
3106 	 */
3107 	buflen = be16_to_cpu(di->disc_information_length) +
3108 		     sizeof(di->disc_information_length);
3109 
3110 	if (buflen > sizeof(disc_information))
3111 		buflen = sizeof(disc_information);
3112 
3113 	cgc.cmd[8] = cgc.buflen = buflen;
3114 	if ((ret = cdo->generic_packet(cdi, &cgc)))
3115 		return ret;
3116 
3117 	/* return actual fill size */
3118 	return buflen;
3119 }
3120 
3121 /* return the last written block on the CD-R media. this is for the udf
3122    file system. */
3123 int cdrom_get_last_written(struct cdrom_device_info *cdi, long *last_written)
3124 {
3125 	struct cdrom_tocentry toc;
3126 	disc_information di;
3127 	track_information ti;
3128 	__u32 last_track;
3129 	int ret = -1, ti_size;
3130 
3131 	if (!CDROM_CAN(CDC_GENERIC_PACKET))
3132 		goto use_toc;
3133 
3134 	ret = cdrom_get_disc_info(cdi, &di);
3135 	if (ret < (int)(offsetof(typeof(di), last_track_lsb)
3136 			+ sizeof(di.last_track_lsb)))
3137 		goto use_toc;
3138 
3139 	/* if unit didn't return msb, it's zeroed by cdrom_get_disc_info */
3140 	last_track = (di.last_track_msb << 8) | di.last_track_lsb;
3141 	ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
3142 	if (ti_size < (int)offsetof(typeof(ti), track_start))
3143 		goto use_toc;
3144 
3145 	/* if this track is blank, try the previous. */
3146 	if (ti.blank) {
3147 		if (last_track==1)
3148 			goto use_toc;
3149 		last_track--;
3150 		ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
3151 	}
3152 
3153 	if (ti_size < (int)(offsetof(typeof(ti), track_size)
3154 				+ sizeof(ti.track_size)))
3155 		goto use_toc;
3156 
3157 	/* if last recorded field is valid, return it. */
3158 	if (ti.lra_v && ti_size >= (int)(offsetof(typeof(ti), last_rec_address)
3159 				+ sizeof(ti.last_rec_address))) {
3160 		*last_written = be32_to_cpu(ti.last_rec_address);
3161 	} else {
3162 		/* make it up instead */
3163 		*last_written = be32_to_cpu(ti.track_start) +
3164 				be32_to_cpu(ti.track_size);
3165 		if (ti.free_blocks)
3166 			*last_written -= (be32_to_cpu(ti.free_blocks) + 7);
3167 	}
3168 	return 0;
3169 
3170 	/* this is where we end up if the drive either can't do a
3171 	   GPCMD_READ_DISC_INFO or GPCMD_READ_TRACK_RZONE_INFO or if
3172 	   it doesn't give enough information or fails. then we return
3173 	   the toc contents. */
3174 use_toc:
3175 	toc.cdte_format = CDROM_MSF;
3176 	toc.cdte_track = CDROM_LEADOUT;
3177 	if ((ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCENTRY, &toc)))
3178 		return ret;
3179 	sanitize_format(&toc.cdte_addr, &toc.cdte_format, CDROM_LBA);
3180 	*last_written = toc.cdte_addr.lba;
3181 	return 0;
3182 }
3183 
3184 /* return the next writable block. also for udf file system. */
3185 static int cdrom_get_next_writable(struct cdrom_device_info *cdi, long *next_writable)
3186 {
3187 	disc_information di;
3188 	track_information ti;
3189 	__u16 last_track;
3190 	int ret, ti_size;
3191 
3192 	if (!CDROM_CAN(CDC_GENERIC_PACKET))
3193 		goto use_last_written;
3194 
3195 	ret = cdrom_get_disc_info(cdi, &di);
3196 	if (ret < 0 || ret < offsetof(typeof(di), last_track_lsb)
3197 				+ sizeof(di.last_track_lsb))
3198 		goto use_last_written;
3199 
3200 	/* if unit didn't return msb, it's zeroed by cdrom_get_disc_info */
3201 	last_track = (di.last_track_msb << 8) | di.last_track_lsb;
3202 	ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
3203 	if (ti_size < 0 || ti_size < offsetof(typeof(ti), track_start))
3204 		goto use_last_written;
3205 
3206         /* if this track is blank, try the previous. */
3207 	if (ti.blank) {
3208 		if (last_track == 1)
3209 			goto use_last_written;
3210 		last_track--;
3211 		ti_size = cdrom_get_track_info(cdi, last_track, 1, &ti);
3212 		if (ti_size < 0)
3213 			goto use_last_written;
3214 	}
3215 
3216 	/* if next recordable address field is valid, use it. */
3217 	if (ti.nwa_v && ti_size >= offsetof(typeof(ti), next_writable)
3218 				+ sizeof(ti.next_writable)) {
3219 		*next_writable = be32_to_cpu(ti.next_writable);
3220 		return 0;
3221 	}
3222 
3223 use_last_written:
3224 	if ((ret = cdrom_get_last_written(cdi, next_writable))) {
3225 		*next_writable = 0;
3226 		return ret;
3227 	} else {
3228 		*next_writable += 7;
3229 		return 0;
3230 	}
3231 }
3232 
3233 EXPORT_SYMBOL(cdrom_get_last_written);
3234 EXPORT_SYMBOL(register_cdrom);
3235 EXPORT_SYMBOL(unregister_cdrom);
3236 EXPORT_SYMBOL(cdrom_open);
3237 EXPORT_SYMBOL(cdrom_release);
3238 EXPORT_SYMBOL(cdrom_ioctl);
3239 EXPORT_SYMBOL(cdrom_media_changed);
3240 EXPORT_SYMBOL(cdrom_number_of_slots);
3241 EXPORT_SYMBOL(cdrom_mode_select);
3242 EXPORT_SYMBOL(cdrom_mode_sense);
3243 EXPORT_SYMBOL(init_cdrom_command);
3244 EXPORT_SYMBOL(cdrom_get_media_event);
3245 
3246 #ifdef CONFIG_SYSCTL
3247 
3248 #define CDROM_STR_SIZE 1000
3249 
3250 static struct cdrom_sysctl_settings {
3251 	char	info[CDROM_STR_SIZE];	/* general info */
3252 	int	autoclose;		/* close tray upon mount, etc */
3253 	int	autoeject;		/* eject on umount */
3254 	int	debug;			/* turn on debugging messages */
3255 	int	lock;			/* lock the door on device open */
3256 	int	check;			/* check media type */
3257 } cdrom_sysctl_settings;
3258 
3259 enum cdrom_print_option {
3260 	CTL_NAME,
3261 	CTL_SPEED,
3262 	CTL_SLOTS,
3263 	CTL_CAPABILITY
3264 };
3265 
3266 static int cdrom_print_info(const char *header, int val, char *info,
3267 				int *pos, enum cdrom_print_option option)
3268 {
3269 	const int max_size = sizeof(cdrom_sysctl_settings.info);
3270 	struct cdrom_device_info *cdi;
3271 	int ret;
3272 
3273 	ret = scnprintf(info + *pos, max_size - *pos, header);
3274 	if (!ret)
3275 		return 1;
3276 
3277 	*pos += ret;
3278 
3279 	list_for_each_entry(cdi, &cdrom_list, list) {
3280 		switch (option) {
3281 		case CTL_NAME:
3282 			ret = scnprintf(info + *pos, max_size - *pos,
3283 					"\t%s", cdi->name);
3284 			break;
3285 		case CTL_SPEED:
3286 			ret = scnprintf(info + *pos, max_size - *pos,
3287 					"\t%d", cdi->speed);
3288 			break;
3289 		case CTL_SLOTS:
3290 			ret = scnprintf(info + *pos, max_size - *pos,
3291 					"\t%d", cdi->capacity);
3292 			break;
3293 		case CTL_CAPABILITY:
3294 			ret = scnprintf(info + *pos, max_size - *pos,
3295 					"\t%d", CDROM_CAN(val) != 0);
3296 			break;
3297 		default:
3298 			printk(KERN_INFO "cdrom: invalid option%d\n", option);
3299 			return 1;
3300 		}
3301 		if (!ret)
3302 			return 1;
3303 		*pos += ret;
3304 	}
3305 
3306 	return 0;
3307 }
3308 
3309 static int cdrom_sysctl_info(ctl_table *ctl, int write, struct file * filp,
3310                            void __user *buffer, size_t *lenp, loff_t *ppos)
3311 {
3312 	int pos;
3313 	char *info = cdrom_sysctl_settings.info;
3314 	const int max_size = sizeof(cdrom_sysctl_settings.info);
3315 
3316 	if (!*lenp || (*ppos && !write)) {
3317 		*lenp = 0;
3318 		return 0;
3319 	}
3320 
3321 	mutex_lock(&cdrom_mutex);
3322 
3323 	pos = sprintf(info, "CD-ROM information, " VERSION "\n");
3324 
3325 	if (cdrom_print_info("\ndrive name:\t", 0, info, &pos, CTL_NAME))
3326 		goto done;
3327 	if (cdrom_print_info("\ndrive speed:\t", 0, info, &pos, CTL_SPEED))
3328 		goto done;
3329 	if (cdrom_print_info("\ndrive # of slots:", 0, info, &pos, CTL_SLOTS))
3330 		goto done;
3331 	if (cdrom_print_info("\nCan close tray:\t",
3332 				CDC_CLOSE_TRAY, info, &pos, CTL_CAPABILITY))
3333 		goto done;
3334 	if (cdrom_print_info("\nCan open tray:\t",
3335 				CDC_OPEN_TRAY, info, &pos, CTL_CAPABILITY))
3336 		goto done;
3337 	if (cdrom_print_info("\nCan lock tray:\t",
3338 				CDC_LOCK, info, &pos, CTL_CAPABILITY))
3339 		goto done;
3340 	if (cdrom_print_info("\nCan change speed:",
3341 				CDC_SELECT_SPEED, info, &pos, CTL_CAPABILITY))
3342 		goto done;
3343 	if (cdrom_print_info("\nCan select disk:",
3344 				CDC_SELECT_DISC, info, &pos, CTL_CAPABILITY))
3345 		goto done;
3346 	if (cdrom_print_info("\nCan read multisession:",
3347 				CDC_MULTI_SESSION, info, &pos, CTL_CAPABILITY))
3348 		goto done;
3349 	if (cdrom_print_info("\nCan read MCN:\t",
3350 				CDC_MCN, info, &pos, CTL_CAPABILITY))
3351 		goto done;
3352 	if (cdrom_print_info("\nReports media changed:",
3353 				CDC_MEDIA_CHANGED, info, &pos, CTL_CAPABILITY))
3354 		goto done;
3355 	if (cdrom_print_info("\nCan play audio:\t",
3356 				CDC_PLAY_AUDIO, info, &pos, CTL_CAPABILITY))
3357 		goto done;
3358 	if (cdrom_print_info("\nCan write CD-R:\t",
3359 				CDC_CD_R, info, &pos, CTL_CAPABILITY))
3360 		goto done;
3361 	if (cdrom_print_info("\nCan write CD-RW:",
3362 				CDC_CD_RW, info, &pos, CTL_CAPABILITY))
3363 		goto done;
3364 	if (cdrom_print_info("\nCan read DVD:\t",
3365 				CDC_DVD, info, &pos, CTL_CAPABILITY))
3366 		goto done;
3367 	if (cdrom_print_info("\nCan write DVD-R:",
3368 				CDC_DVD_R, info, &pos, CTL_CAPABILITY))
3369 		goto done;
3370 	if (cdrom_print_info("\nCan write DVD-RAM:",
3371 				CDC_DVD_RAM, info, &pos, CTL_CAPABILITY))
3372 		goto done;
3373 	if (cdrom_print_info("\nCan read MRW:\t",
3374 				CDC_MRW, info, &pos, CTL_CAPABILITY))
3375 		goto done;
3376 	if (cdrom_print_info("\nCan write MRW:\t",
3377 				CDC_MRW_W, info, &pos, CTL_CAPABILITY))
3378 		goto done;
3379 	if (cdrom_print_info("\nCan write RAM:\t",
3380 				CDC_RAM, info, &pos, CTL_CAPABILITY))
3381 		goto done;
3382 	if (!scnprintf(info + pos, max_size - pos, "\n\n"))
3383 		goto done;
3384 doit:
3385 	mutex_unlock(&cdrom_mutex);
3386 	return proc_dostring(ctl, write, filp, buffer, lenp, ppos);
3387 done:
3388 	printk(KERN_INFO "cdrom: info buffer too small\n");
3389 	goto doit;
3390 }
3391 
3392 /* Unfortunately, per device settings are not implemented through
3393    procfs/sysctl yet. When they are, this will naturally disappear. For now
3394    just update all drives. Later this will become the template on which
3395    new registered drives will be based. */
3396 static void cdrom_update_settings(void)
3397 {
3398 	struct cdrom_device_info *cdi;
3399 
3400 	mutex_lock(&cdrom_mutex);
3401 	list_for_each_entry(cdi, &cdrom_list, list) {
3402 		if (autoclose && CDROM_CAN(CDC_CLOSE_TRAY))
3403 			cdi->options |= CDO_AUTO_CLOSE;
3404 		else if (!autoclose)
3405 			cdi->options &= ~CDO_AUTO_CLOSE;
3406 		if (autoeject && CDROM_CAN(CDC_OPEN_TRAY))
3407 			cdi->options |= CDO_AUTO_EJECT;
3408 		else if (!autoeject)
3409 			cdi->options &= ~CDO_AUTO_EJECT;
3410 		if (lockdoor && CDROM_CAN(CDC_LOCK))
3411 			cdi->options |= CDO_LOCK;
3412 		else if (!lockdoor)
3413 			cdi->options &= ~CDO_LOCK;
3414 		if (check_media_type)
3415 			cdi->options |= CDO_CHECK_TYPE;
3416 		else
3417 			cdi->options &= ~CDO_CHECK_TYPE;
3418 	}
3419 	mutex_unlock(&cdrom_mutex);
3420 }
3421 
3422 static int cdrom_sysctl_handler(ctl_table *ctl, int write, struct file * filp,
3423 				void __user *buffer, size_t *lenp, loff_t *ppos)
3424 {
3425 	int ret;
3426 
3427 	ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3428 
3429 	if (write) {
3430 
3431 		/* we only care for 1 or 0. */
3432 		autoclose        = !!cdrom_sysctl_settings.autoclose;
3433 		autoeject        = !!cdrom_sysctl_settings.autoeject;
3434 		debug	         = !!cdrom_sysctl_settings.debug;
3435 		lockdoor         = !!cdrom_sysctl_settings.lock;
3436 		check_media_type = !!cdrom_sysctl_settings.check;
3437 
3438 		/* update the option flags according to the changes. we
3439 		   don't have per device options through sysctl yet,
3440 		   but we will have and then this will disappear. */
3441 		cdrom_update_settings();
3442 	}
3443 
3444         return ret;
3445 }
3446 
3447 /* Place files in /proc/sys/dev/cdrom */
3448 static ctl_table cdrom_table[] = {
3449 	{
3450 		.procname	= "info",
3451 		.data		= &cdrom_sysctl_settings.info,
3452 		.maxlen		= CDROM_STR_SIZE,
3453 		.mode		= 0444,
3454 		.proc_handler	= &cdrom_sysctl_info,
3455 	},
3456 	{
3457 		.procname	= "autoclose",
3458 		.data		= &cdrom_sysctl_settings.autoclose,
3459 		.maxlen		= sizeof(int),
3460 		.mode		= 0644,
3461 		.proc_handler	= &cdrom_sysctl_handler,
3462 	},
3463 	{
3464 		.procname	= "autoeject",
3465 		.data		= &cdrom_sysctl_settings.autoeject,
3466 		.maxlen		= sizeof(int),
3467 		.mode		= 0644,
3468 		.proc_handler	= &cdrom_sysctl_handler,
3469 	},
3470 	{
3471 		.procname	= "debug",
3472 		.data		= &cdrom_sysctl_settings.debug,
3473 		.maxlen		= sizeof(int),
3474 		.mode		= 0644,
3475 		.proc_handler	= &cdrom_sysctl_handler,
3476 	},
3477 	{
3478 		.procname	= "lock",
3479 		.data		= &cdrom_sysctl_settings.lock,
3480 		.maxlen		= sizeof(int),
3481 		.mode		= 0644,
3482 		.proc_handler	= &cdrom_sysctl_handler,
3483 	},
3484 	{
3485 		.procname	= "check_media",
3486 		.data		= &cdrom_sysctl_settings.check,
3487 		.maxlen		= sizeof(int),
3488 		.mode		= 0644,
3489 		.proc_handler	= &cdrom_sysctl_handler
3490 	},
3491 	{ .ctl_name = 0 }
3492 };
3493 
3494 static ctl_table cdrom_cdrom_table[] = {
3495 	{
3496 		.ctl_name	= DEV_CDROM,
3497 		.procname	= "cdrom",
3498 		.maxlen		= 0,
3499 		.mode		= 0555,
3500 		.child		= cdrom_table,
3501 	},
3502 	{ .ctl_name = 0 }
3503 };
3504 
3505 /* Make sure that /proc/sys/dev is there */
3506 static ctl_table cdrom_root_table[] = {
3507 	{
3508 		.ctl_name	= CTL_DEV,
3509 		.procname	= "dev",
3510 		.maxlen		= 0,
3511 		.mode		= 0555,
3512 		.child		= cdrom_cdrom_table,
3513 	},
3514 	{ .ctl_name = 0 }
3515 };
3516 static struct ctl_table_header *cdrom_sysctl_header;
3517 
3518 static void cdrom_sysctl_register(void)
3519 {
3520 	static int initialized;
3521 
3522 	if (initialized == 1)
3523 		return;
3524 
3525 	cdrom_sysctl_header = register_sysctl_table(cdrom_root_table);
3526 
3527 	/* set the defaults */
3528 	cdrom_sysctl_settings.autoclose = autoclose;
3529 	cdrom_sysctl_settings.autoeject = autoeject;
3530 	cdrom_sysctl_settings.debug = debug;
3531 	cdrom_sysctl_settings.lock = lockdoor;
3532 	cdrom_sysctl_settings.check = check_media_type;
3533 
3534 	initialized = 1;
3535 }
3536 
3537 static void cdrom_sysctl_unregister(void)
3538 {
3539 	if (cdrom_sysctl_header)
3540 		unregister_sysctl_table(cdrom_sysctl_header);
3541 }
3542 
3543 #else /* CONFIG_SYSCTL */
3544 
3545 static void cdrom_sysctl_register(void)
3546 {
3547 }
3548 
3549 static void cdrom_sysctl_unregister(void)
3550 {
3551 }
3552 
3553 #endif /* CONFIG_SYSCTL */
3554 
3555 static int __init cdrom_init(void)
3556 {
3557 	cdrom_sysctl_register();
3558 
3559 	return 0;
3560 }
3561 
3562 static void __exit cdrom_exit(void)
3563 {
3564 	printk(KERN_INFO "Uniform CD-ROM driver unloaded\n");
3565 	cdrom_sysctl_unregister();
3566 }
3567 
3568 module_init(cdrom_init);
3569 module_exit(cdrom_exit);
3570 MODULE_LICENSE("GPL");
3571