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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * sr.c Copyright (C) 1992 David Giller
4 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
5 *
6 * adapted from:
7 * sd.c Copyright (C) 1992 Drew Eckhardt
8 * Linux scsi disk driver by
9 * Drew Eckhardt <drew@colorado.edu>
10 *
11 * Modified by Eric Youngdale ericy@andante.org to
12 * add scatter-gather, multiple outstanding request, and other
13 * enhancements.
14 *
15 * Modified by Eric Youngdale eric@andante.org to support loadable
16 * low-level scsi drivers.
17 *
18 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
19 * provide auto-eject.
20 *
21 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
22 * generic cdrom interface
23 *
24 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
25 * interface, capabilities probe additions, ioctl cleanups, etc.
26 *
27 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
28 *
29 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
30 * transparently and lose the GHOST hack
31 *
32 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
33 * check resource allocation in sr_init and some cleanups
34 */
35
36#include <linux/module.h>
37#include <linux/fs.h>
38#include <linux/kernel.h>
39#include <linux/mm.h>
40#include <linux/bio.h>
41#include <linux/compat.h>
42#include <linux/string.h>
43#include <linux/errno.h>
44#include <linux/cdrom.h>
45#include <linux/interrupt.h>
46#include <linux/init.h>
47#include <linux/blkdev.h>
48#include <linux/blk-pm.h>
49#include <linux/mutex.h>
50#include <linux/slab.h>
51#include <linux/pm_runtime.h>
52#include <linux/uaccess.h>
53
54#include <asm/unaligned.h>
55
56#include <scsi/scsi.h>
57#include <scsi/scsi_dbg.h>
58#include <scsi/scsi_device.h>
59#include <scsi/scsi_driver.h>
60#include <scsi/scsi_cmnd.h>
61#include <scsi/scsi_eh.h>
62#include <scsi/scsi_host.h>
63#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
64
65#include "scsi_logging.h"
66#include "sr.h"
67
68
69MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
70MODULE_LICENSE("GPL");
71MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
72MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
73MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
74
75#define SR_DISKS 256
76
77#define SR_CAPABILITIES \
78 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
79 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
80 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
81 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
82 CDC_MRW|CDC_MRW_W|CDC_RAM)
83
84static int sr_probe(struct device *);
85static int sr_remove(struct device *);
86static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt);
87static int sr_done(struct scsi_cmnd *);
88static int sr_runtime_suspend(struct device *dev);
89
90static const struct dev_pm_ops sr_pm_ops = {
91 .runtime_suspend = sr_runtime_suspend,
92};
93
94static struct scsi_driver sr_template = {
95 .gendrv = {
96 .name = "sr",
97 .owner = THIS_MODULE,
98 .probe = sr_probe,
99 .remove = sr_remove,
100 .pm = &sr_pm_ops,
101 },
102 .init_command = sr_init_command,
103 .done = sr_done,
104};
105
106static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
107static DEFINE_SPINLOCK(sr_index_lock);
108
109/* This semaphore is used to mediate the 0->1 reference get in the
110 * face of object destruction (i.e. we can't allow a get on an
111 * object after last put) */
112static DEFINE_MUTEX(sr_ref_mutex);
113
114static int sr_open(struct cdrom_device_info *, int);
115static void sr_release(struct cdrom_device_info *);
116
117static void get_sectorsize(struct scsi_cd *);
118static void get_capabilities(struct scsi_cd *);
119
120static unsigned int sr_check_events(struct cdrom_device_info *cdi,
121 unsigned int clearing, int slot);
122static int sr_packet(struct cdrom_device_info *, struct packet_command *);
123
124static const struct cdrom_device_ops sr_dops = {
125 .open = sr_open,
126 .release = sr_release,
127 .drive_status = sr_drive_status,
128 .check_events = sr_check_events,
129 .tray_move = sr_tray_move,
130 .lock_door = sr_lock_door,
131 .select_speed = sr_select_speed,
132 .get_last_session = sr_get_last_session,
133 .get_mcn = sr_get_mcn,
134 .reset = sr_reset,
135 .audio_ioctl = sr_audio_ioctl,
136 .capability = SR_CAPABILITIES,
137 .generic_packet = sr_packet,
138};
139
140static void sr_kref_release(struct kref *kref);
141
142static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
143{
144 return container_of(disk->private_data, struct scsi_cd, driver);
145}
146
147static int sr_runtime_suspend(struct device *dev)
148{
149 struct scsi_cd *cd = dev_get_drvdata(dev);
150
151 if (!cd) /* E.g.: runtime suspend following sr_remove() */
152 return 0;
153
154 if (cd->media_present)
155 return -EBUSY;
156 else
157 return 0;
158}
159
160/*
161 * The get and put routines for the struct scsi_cd. Note this entity
162 * has a scsi_device pointer and owns a reference to this.
163 */
164static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
165{
166 struct scsi_cd *cd = NULL;
167
168 mutex_lock(&sr_ref_mutex);
169 if (disk->private_data == NULL)
170 goto out;
171 cd = scsi_cd(disk);
172 kref_get(&cd->kref);
173 if (scsi_device_get(cd->device)) {
174 kref_put(&cd->kref, sr_kref_release);
175 cd = NULL;
176 }
177 out:
178 mutex_unlock(&sr_ref_mutex);
179 return cd;
180}
181
182static void scsi_cd_put(struct scsi_cd *cd)
183{
184 struct scsi_device *sdev = cd->device;
185
186 mutex_lock(&sr_ref_mutex);
187 kref_put(&cd->kref, sr_kref_release);
188 scsi_device_put(sdev);
189 mutex_unlock(&sr_ref_mutex);
190}
191
192static unsigned int sr_get_events(struct scsi_device *sdev)
193{
194 u8 buf[8];
195 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
196 1, /* polled */
197 0, 0, /* reserved */
198 1 << 4, /* notification class: media */
199 0, 0, /* reserved */
200 0, sizeof(buf), /* allocation length */
201 0, /* control */
202 };
203 struct event_header *eh = (void *)buf;
204 struct media_event_desc *med = (void *)(buf + 4);
205 struct scsi_sense_hdr sshdr;
206 int result;
207
208 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf),
209 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL);
210 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
211 return DISK_EVENT_MEDIA_CHANGE;
212
213 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
214 return 0;
215
216 if (eh->nea || eh->notification_class != 0x4)
217 return 0;
218
219 if (med->media_event_code == 1)
220 return DISK_EVENT_EJECT_REQUEST;
221 else if (med->media_event_code == 2)
222 return DISK_EVENT_MEDIA_CHANGE;
223 else if (med->media_event_code == 3)
224 return DISK_EVENT_MEDIA_CHANGE;
225 return 0;
226}
227
228/*
229 * This function checks to see if the media has been changed or eject
230 * button has been pressed. It is possible that we have already
231 * sensed a change, or the drive may have sensed one and not yet
232 * reported it. The past events are accumulated in sdev->changed and
233 * returned together with the current state.
234 */
235static unsigned int sr_check_events(struct cdrom_device_info *cdi,
236 unsigned int clearing, int slot)
237{
238 struct scsi_cd *cd = cdi->handle;
239 bool last_present;
240 struct scsi_sense_hdr sshdr;
241 unsigned int events;
242 int ret;
243
244 /* no changer support */
245 if (CDSL_CURRENT != slot)
246 return 0;
247
248 events = sr_get_events(cd->device);
249 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
250
251 /*
252 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
253 * for several times in a row. We rely on TUR only for this likely
254 * broken device, to prevent generating incorrect media changed
255 * events for every open().
256 */
257 if (cd->ignore_get_event) {
258 events &= ~DISK_EVENT_MEDIA_CHANGE;
259 goto do_tur;
260 }
261
262 /*
263 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
264 * is being cleared. Note that there are devices which hang
265 * if asked to execute TUR repeatedly.
266 */
267 if (cd->device->changed) {
268 events |= DISK_EVENT_MEDIA_CHANGE;
269 cd->device->changed = 0;
270 cd->tur_changed = true;
271 }
272
273 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
274 return events;
275do_tur:
276 /* let's see whether the media is there with TUR */
277 last_present = cd->media_present;
278 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
279
280 /*
281 * Media is considered to be present if TUR succeeds or fails with
282 * sense data indicating something other than media-not-present
283 * (ASC 0x3a).
284 */
285 cd->media_present = scsi_status_is_good(ret) ||
286 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
287
288 if (last_present != cd->media_present)
289 cd->device->changed = 1;
290
291 if (cd->device->changed) {
292 events |= DISK_EVENT_MEDIA_CHANGE;
293 cd->device->changed = 0;
294 cd->tur_changed = true;
295 }
296
297 if (cd->ignore_get_event)
298 return events;
299
300 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
301 if (!cd->tur_changed) {
302 if (cd->get_event_changed) {
303 if (cd->tur_mismatch++ > 8) {
304 sr_printk(KERN_WARNING, cd,
305 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
306 cd->ignore_get_event = true;
307 }
308 } else {
309 cd->tur_mismatch = 0;
310 }
311 }
312 cd->tur_changed = false;
313 cd->get_event_changed = false;
314
315 return events;
316}
317
318/*
319 * sr_done is the interrupt routine for the device driver.
320 *
321 * It will be notified on the end of a SCSI read / write, and will take one
322 * of several actions based on success or failure.
323 */
324static int sr_done(struct scsi_cmnd *SCpnt)
325{
326 int result = SCpnt->result;
327 int this_count = scsi_bufflen(SCpnt);
328 int good_bytes = (result == 0 ? this_count : 0);
329 int block_sectors = 0;
330 long error_sector;
331 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
332
333#ifdef DEBUG
334 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);
335#endif
336
337 /*
338 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
339 * success. Since this is a relatively rare error condition, no
340 * care is taken to avoid unnecessary additional work such as
341 * memcpy's that could be avoided.
342 */
343 if (scsi_status_is_check_condition(result) &&
344 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
345 switch (SCpnt->sense_buffer[2]) {
346 case MEDIUM_ERROR:
347 case VOLUME_OVERFLOW:
348 case ILLEGAL_REQUEST:
349 if (!(SCpnt->sense_buffer[0] & 0x90))
350 break;
351 error_sector =
352 get_unaligned_be32(&SCpnt->sense_buffer[3]);
353 if (SCpnt->request->bio != NULL)
354 block_sectors =
355 bio_sectors(SCpnt->request->bio);
356 if (block_sectors < 4)
357 block_sectors = 4;
358 if (cd->device->sector_size == 2048)
359 error_sector <<= 2;
360 error_sector &= ~(block_sectors - 1);
361 good_bytes = (error_sector -
362 blk_rq_pos(SCpnt->request)) << 9;
363 if (good_bytes < 0 || good_bytes >= this_count)
364 good_bytes = 0;
365 /*
366 * The SCSI specification allows for the value
367 * returned by READ CAPACITY to be up to 75 2K
368 * sectors past the last readable block.
369 * Therefore, if we hit a medium error within the
370 * last 75 2K sectors, we decrease the saved size
371 * value.
372 */
373 if (error_sector < get_capacity(cd->disk) &&
374 cd->capacity - error_sector < 4 * 75)
375 set_capacity(cd->disk, error_sector);
376 break;
377
378 case RECOVERED_ERROR:
379 good_bytes = this_count;
380 break;
381
382 default:
383 break;
384 }
385 }
386
387 return good_bytes;
388}
389
390static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt)
391{
392 int block = 0, this_count, s_size;
393 struct scsi_cd *cd;
394 struct request *rq = SCpnt->request;
395 blk_status_t ret;
396
397 ret = scsi_alloc_sgtables(SCpnt);
398 if (ret != BLK_STS_OK)
399 return ret;
400 cd = scsi_cd(rq->rq_disk);
401
402 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
403 "Doing sr request, block = %d\n", block));
404
405 if (!cd->device || !scsi_device_online(cd->device)) {
406 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
407 "Finishing %u sectors\n", blk_rq_sectors(rq)));
408 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
409 "Retry with 0x%p\n", SCpnt));
410 goto out;
411 }
412
413 if (cd->device->changed) {
414 /*
415 * quietly refuse to do anything to a changed disc until the
416 * changed bit has been reset
417 */
418 goto out;
419 }
420
421 s_size = cd->device->sector_size;
422 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
423 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
424 goto out;
425 }
426
427 switch (req_op(rq)) {
428 case REQ_OP_WRITE:
429 if (!cd->writeable)
430 goto out;
431 SCpnt->cmnd[0] = WRITE_10;
432 cd->cdi.media_written = 1;
433 break;
434 case REQ_OP_READ:
435 SCpnt->cmnd[0] = READ_10;
436 break;
437 default:
438 blk_dump_rq_flags(rq, "Unknown sr command");
439 goto out;
440 }
441
442 {
443 struct scatterlist *sg;
444 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
445
446 scsi_for_each_sg(SCpnt, sg, sg_count, i)
447 size += sg->length;
448
449 if (size != scsi_bufflen(SCpnt)) {
450 scmd_printk(KERN_ERR, SCpnt,
451 "mismatch count %d, bytes %d\n",
452 size, scsi_bufflen(SCpnt));
453 if (scsi_bufflen(SCpnt) > size)
454 SCpnt->sdb.length = size;
455 }
456 }
457
458 /*
459 * request doesn't start on hw block boundary, add scatter pads
460 */
461 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
462 (scsi_bufflen(SCpnt) % s_size)) {
463 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
464 goto out;
465 }
466
467 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
468
469
470 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
471 "%s %d/%u 512 byte blocks.\n",
472 (rq_data_dir(rq) == WRITE) ?
473 "writing" : "reading",
474 this_count, blk_rq_sectors(rq)));
475
476 SCpnt->cmnd[1] = 0;
477 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
478
479 if (this_count > 0xffff) {
480 this_count = 0xffff;
481 SCpnt->sdb.length = this_count * s_size;
482 }
483
484 put_unaligned_be32(block, &SCpnt->cmnd[2]);
485 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
486 put_unaligned_be16(this_count, &SCpnt->cmnd[7]);
487
488 /*
489 * We shouldn't disconnect in the middle of a sector, so with a dumb
490 * host adapter, it's safe to assume that we can at least transfer
491 * this many bytes between each connect / disconnect.
492 */
493 SCpnt->transfersize = cd->device->sector_size;
494 SCpnt->underflow = this_count << 9;
495 SCpnt->allowed = MAX_RETRIES;
496 SCpnt->cmd_len = 10;
497
498 /*
499 * This indicates that the command is ready from our end to be queued.
500 */
501 return BLK_STS_OK;
502 out:
503 scsi_free_sgtables(SCpnt);
504 return BLK_STS_IOERR;
505}
506
507static void sr_revalidate_disk(struct scsi_cd *cd)
508{
509 struct scsi_sense_hdr sshdr;
510
511 /* if the unit is not ready, nothing more to do */
512 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
513 return;
514 sr_cd_check(&cd->cdi);
515 get_sectorsize(cd);
516}
517
518static int sr_block_open(struct block_device *bdev, fmode_t mode)
519{
520 struct scsi_cd *cd;
521 struct scsi_device *sdev;
522 int ret = -ENXIO;
523
524 cd = scsi_cd_get(bdev->bd_disk);
525 if (!cd)
526 goto out;
527
528 sdev = cd->device;
529 scsi_autopm_get_device(sdev);
530 if (bdev_check_media_change(bdev))
531 sr_revalidate_disk(cd);
532
533 mutex_lock(&cd->lock);
534 ret = cdrom_open(&cd->cdi, bdev, mode);
535 mutex_unlock(&cd->lock);
536
537 scsi_autopm_put_device(sdev);
538 if (ret)
539 scsi_cd_put(cd);
540
541out:
542 return ret;
543}
544
545static void sr_block_release(struct gendisk *disk, fmode_t mode)
546{
547 struct scsi_cd *cd = scsi_cd(disk);
548
549 mutex_lock(&cd->lock);
550 cdrom_release(&cd->cdi, mode);
551 mutex_unlock(&cd->lock);
552
553 scsi_cd_put(cd);
554}
555
556static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
557 unsigned long arg)
558{
559 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
560 struct scsi_device *sdev = cd->device;
561 void __user *argp = (void __user *)arg;
562 int ret;
563
564 mutex_lock(&cd->lock);
565
566 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
567 (mode & FMODE_NDELAY) != 0);
568 if (ret)
569 goto out;
570
571 scsi_autopm_get_device(sdev);
572
573 /*
574 * Send SCSI addressing ioctls directly to mid level, send other
575 * ioctls to cdrom/block level.
576 */
577 switch (cmd) {
578 case SCSI_IOCTL_GET_IDLUN:
579 case SCSI_IOCTL_GET_BUS_NUMBER:
580 ret = scsi_ioctl(sdev, cmd, argp);
581 goto put;
582 }
583
584 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
585 if (ret != -ENOSYS)
586 goto put;
587
588 ret = scsi_ioctl(sdev, cmd, argp);
589
590put:
591 scsi_autopm_put_device(sdev);
592
593out:
594 mutex_unlock(&cd->lock);
595 return ret;
596}
597
598#ifdef CONFIG_COMPAT
599static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
600 unsigned long arg)
601{
602 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
603 struct scsi_device *sdev = cd->device;
604 void __user *argp = compat_ptr(arg);
605 int ret;
606
607 mutex_lock(&cd->lock);
608
609 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
610 (mode & FMODE_NDELAY) != 0);
611 if (ret)
612 goto out;
613
614 scsi_autopm_get_device(sdev);
615
616 /*
617 * Send SCSI addressing ioctls directly to mid level, send other
618 * ioctls to cdrom/block level.
619 */
620 switch (cmd) {
621 case SCSI_IOCTL_GET_IDLUN:
622 case SCSI_IOCTL_GET_BUS_NUMBER:
623 ret = scsi_compat_ioctl(sdev, cmd, argp);
624 goto put;
625 }
626
627 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, (unsigned long)argp);
628 if (ret != -ENOSYS)
629 goto put;
630
631 ret = scsi_compat_ioctl(sdev, cmd, argp);
632
633put:
634 scsi_autopm_put_device(sdev);
635
636out:
637 mutex_unlock(&cd->lock);
638 return ret;
639
640}
641#endif
642
643static unsigned int sr_block_check_events(struct gendisk *disk,
644 unsigned int clearing)
645{
646 unsigned int ret = 0;
647 struct scsi_cd *cd;
648
649 cd = scsi_cd_get(disk);
650 if (!cd)
651 return 0;
652
653 if (!atomic_read(&cd->device->disk_events_disable_depth))
654 ret = cdrom_check_events(&cd->cdi, clearing);
655
656 scsi_cd_put(cd);
657 return ret;
658}
659
660static const struct block_device_operations sr_bdops =
661{
662 .owner = THIS_MODULE,
663 .open = sr_block_open,
664 .release = sr_block_release,
665 .ioctl = sr_block_ioctl,
666#ifdef CONFIG_COMPAT
667 .compat_ioctl = sr_block_compat_ioctl,
668#endif
669 .check_events = sr_block_check_events,
670};
671
672static int sr_open(struct cdrom_device_info *cdi, int purpose)
673{
674 struct scsi_cd *cd = cdi->handle;
675 struct scsi_device *sdev = cd->device;
676 int retval;
677
678 /*
679 * If the device is in error recovery, wait until it is done.
680 * If the device is offline, then disallow any access to it.
681 */
682 retval = -ENXIO;
683 if (!scsi_block_when_processing_errors(sdev))
684 goto error_out;
685
686 return 0;
687
688error_out:
689 return retval;
690}
691
692static void sr_release(struct cdrom_device_info *cdi)
693{
694}
695
696static int sr_probe(struct device *dev)
697{
698 struct scsi_device *sdev = to_scsi_device(dev);
699 struct gendisk *disk;
700 struct scsi_cd *cd;
701 int minor, error;
702
703 scsi_autopm_get_device(sdev);
704 error = -ENODEV;
705 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
706 goto fail;
707
708 error = -ENOMEM;
709 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
710 if (!cd)
711 goto fail;
712
713 kref_init(&cd->kref);
714
715 disk = alloc_disk(1);
716 if (!disk)
717 goto fail_free;
718 mutex_init(&cd->lock);
719
720 spin_lock(&sr_index_lock);
721 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
722 if (minor == SR_DISKS) {
723 spin_unlock(&sr_index_lock);
724 error = -EBUSY;
725 goto fail_put;
726 }
727 __set_bit(minor, sr_index_bits);
728 spin_unlock(&sr_index_lock);
729
730 disk->major = SCSI_CDROM_MAJOR;
731 disk->first_minor = minor;
732 sprintf(disk->disk_name, "sr%d", minor);
733 disk->fops = &sr_bdops;
734 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
735 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
736 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
737
738 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
739
740 cd->device = sdev;
741 cd->disk = disk;
742 cd->driver = &sr_template;
743 cd->disk = disk;
744 cd->capacity = 0x1fffff;
745 cd->device->changed = 1; /* force recheck CD type */
746 cd->media_present = 1;
747 cd->use = 1;
748 cd->readcd_known = 0;
749 cd->readcd_cdda = 0;
750
751 cd->cdi.ops = &sr_dops;
752 cd->cdi.handle = cd;
753 cd->cdi.mask = 0;
754 cd->cdi.capacity = 1;
755 sprintf(cd->cdi.name, "sr%d", minor);
756
757 sdev->sector_size = 2048; /* A guess, just in case */
758
759 /* FIXME: need to handle a get_capabilities failure properly ?? */
760 get_capabilities(cd);
761 sr_vendor_init(cd);
762
763 set_capacity(disk, cd->capacity);
764 disk->private_data = &cd->driver;
765 disk->queue = sdev->request_queue;
766
767 if (register_cdrom(disk, &cd->cdi))
768 goto fail_minor;
769
770 /*
771 * Initialize block layer runtime PM stuffs before the
772 * periodic event checking request gets started in add_disk.
773 */
774 blk_pm_runtime_init(sdev->request_queue, dev);
775
776 dev_set_drvdata(dev, cd);
777 disk->flags |= GENHD_FL_REMOVABLE;
778 sr_revalidate_disk(cd);
779 device_add_disk(&sdev->sdev_gendev, disk, NULL);
780
781 sdev_printk(KERN_DEBUG, sdev,
782 "Attached scsi CD-ROM %s\n", cd->cdi.name);
783 scsi_autopm_put_device(cd->device);
784
785 return 0;
786
787fail_minor:
788 spin_lock(&sr_index_lock);
789 clear_bit(minor, sr_index_bits);
790 spin_unlock(&sr_index_lock);
791fail_put:
792 put_disk(disk);
793 mutex_destroy(&cd->lock);
794fail_free:
795 kfree(cd);
796fail:
797 scsi_autopm_put_device(sdev);
798 return error;
799}
800
801
802static void get_sectorsize(struct scsi_cd *cd)
803{
804 unsigned char cmd[10];
805 unsigned char buffer[8];
806 int the_result, retries = 3;
807 int sector_size;
808 struct request_queue *queue;
809
810 do {
811 cmd[0] = READ_CAPACITY;
812 memset((void *) &cmd[1], 0, 9);
813 memset(buffer, 0, sizeof(buffer));
814
815 /* Do the command and wait.. */
816 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
817 buffer, sizeof(buffer), NULL,
818 SR_TIMEOUT, MAX_RETRIES, NULL);
819
820 retries--;
821
822 } while (the_result && retries);
823
824
825 if (the_result) {
826 cd->capacity = 0x1fffff;
827 sector_size = 2048; /* A guess, just in case */
828 } else {
829 long last_written;
830
831 cd->capacity = 1 + get_unaligned_be32(&buffer[0]);
832 /*
833 * READ_CAPACITY doesn't return the correct size on
834 * certain UDF media. If last_written is larger, use
835 * it instead.
836 *
837 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
838 */
839 if (!cdrom_get_last_written(&cd->cdi, &last_written))
840 cd->capacity = max_t(long, cd->capacity, last_written);
841
842 sector_size = get_unaligned_be32(&buffer[4]);
843 switch (sector_size) {
844 /*
845 * HP 4020i CD-Recorder reports 2340 byte sectors
846 * Philips CD-Writers report 2352 byte sectors
847 *
848 * Use 2k sectors for them..
849 */
850 case 0:
851 case 2340:
852 case 2352:
853 sector_size = 2048;
854 fallthrough;
855 case 2048:
856 cd->capacity *= 4;
857 fallthrough;
858 case 512:
859 break;
860 default:
861 sr_printk(KERN_INFO, cd,
862 "unsupported sector size %d.", sector_size);
863 cd->capacity = 0;
864 }
865
866 cd->device->sector_size = sector_size;
867
868 /*
869 * Add this so that we have the ability to correctly gauge
870 * what the device is capable of.
871 */
872 set_capacity(cd->disk, cd->capacity);
873 }
874
875 queue = cd->device->request_queue;
876 blk_queue_logical_block_size(queue, sector_size);
877
878 return;
879}
880
881static void get_capabilities(struct scsi_cd *cd)
882{
883 unsigned char *buffer;
884 struct scsi_mode_data data;
885 struct scsi_sense_hdr sshdr;
886 unsigned int ms_len = 128;
887 int rc, n;
888
889 static const char *loadmech[] =
890 {
891 "caddy",
892 "tray",
893 "pop-up",
894 "",
895 "changer",
896 "cartridge changer",
897 "",
898 ""
899 };
900
901
902 /* allocate transfer buffer */
903 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
904 if (!buffer) {
905 sr_printk(KERN_ERR, cd, "out of memory.\n");
906 return;
907 }
908
909 /* eat unit attentions */
910 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
911
912 /* ask for mode page 0x2a */
913 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len,
914 SR_TIMEOUT, 3, &data, NULL);
915
916 if (rc < 0 || data.length > ms_len ||
917 data.header_length + data.block_descriptor_length > data.length) {
918 /* failed, drive doesn't have capabilities mode page */
919 cd->cdi.speed = 1;
920 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
921 CDC_DVD | CDC_DVD_RAM |
922 CDC_SELECT_DISC | CDC_SELECT_SPEED |
923 CDC_MRW | CDC_MRW_W | CDC_RAM);
924 kfree(buffer);
925 sr_printk(KERN_INFO, cd, "scsi-1 drive");
926 return;
927 }
928
929 n = data.header_length + data.block_descriptor_length;
930 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176;
931 cd->readcd_known = 1;
932 cd->readcd_cdda = buffer[n + 5] & 0x01;
933 /* print some capability bits */
934 sr_printk(KERN_INFO, cd,
935 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",
936 get_unaligned_be16(&buffer[n + 14]) / 176,
937 cd->cdi.speed,
938 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
939 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
940 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
941 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
942 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
943 loadmech[buffer[n + 6] >> 5]);
944 if ((buffer[n + 6] >> 5) == 0)
945 /* caddy drives can't close tray... */
946 cd->cdi.mask |= CDC_CLOSE_TRAY;
947 if ((buffer[n + 2] & 0x8) == 0)
948 /* not a DVD drive */
949 cd->cdi.mask |= CDC_DVD;
950 if ((buffer[n + 3] & 0x20) == 0)
951 /* can't write DVD-RAM media */
952 cd->cdi.mask |= CDC_DVD_RAM;
953 if ((buffer[n + 3] & 0x10) == 0)
954 /* can't write DVD-R media */
955 cd->cdi.mask |= CDC_DVD_R;
956 if ((buffer[n + 3] & 0x2) == 0)
957 /* can't write CD-RW media */
958 cd->cdi.mask |= CDC_CD_RW;
959 if ((buffer[n + 3] & 0x1) == 0)
960 /* can't write CD-R media */
961 cd->cdi.mask |= CDC_CD_R;
962 if ((buffer[n + 6] & 0x8) == 0)
963 /* can't eject */
964 cd->cdi.mask |= CDC_OPEN_TRAY;
965
966 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
967 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
968 cd->cdi.capacity =
969 cdrom_number_of_slots(&cd->cdi);
970 if (cd->cdi.capacity <= 1)
971 /* not a changer */
972 cd->cdi.mask |= CDC_SELECT_DISC;
973 /*else I don't think it can close its tray
974 cd->cdi.mask |= CDC_CLOSE_TRAY; */
975
976 /*
977 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
978 */
979 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
980 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
981 cd->writeable = 1;
982 }
983
984 kfree(buffer);
985}
986
987/*
988 * sr_packet() is the entry point for the generic commands generated
989 * by the Uniform CD-ROM layer.
990 */
991static int sr_packet(struct cdrom_device_info *cdi,
992 struct packet_command *cgc)
993{
994 struct scsi_cd *cd = cdi->handle;
995 struct scsi_device *sdev = cd->device;
996
997 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
998 return -EDRIVE_CANT_DO_THIS;
999
1000 if (cgc->timeout <= 0)
1001 cgc->timeout = IOCTL_TIMEOUT;
1002
1003 sr_do_ioctl(cd, cgc);
1004
1005 return cgc->stat;
1006}
1007
1008/**
1009 * sr_kref_release - Called to free the scsi_cd structure
1010 * @kref: pointer to embedded kref
1011 *
1012 * sr_ref_mutex must be held entering this routine. Because it is
1013 * called on last put, you should always use the scsi_cd_get()
1014 * scsi_cd_put() helpers which manipulate the semaphore directly
1015 * and never do a direct kref_put().
1016 **/
1017static void sr_kref_release(struct kref *kref)
1018{
1019 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
1020 struct gendisk *disk = cd->disk;
1021
1022 spin_lock(&sr_index_lock);
1023 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
1024 spin_unlock(&sr_index_lock);
1025
1026 unregister_cdrom(&cd->cdi);
1027
1028 disk->private_data = NULL;
1029
1030 put_disk(disk);
1031
1032 mutex_destroy(&cd->lock);
1033
1034 kfree(cd);
1035}
1036
1037static int sr_remove(struct device *dev)
1038{
1039 struct scsi_cd *cd = dev_get_drvdata(dev);
1040
1041 scsi_autopm_get_device(cd->device);
1042
1043 del_gendisk(cd->disk);
1044 dev_set_drvdata(dev, NULL);
1045
1046 mutex_lock(&sr_ref_mutex);
1047 kref_put(&cd->kref, sr_kref_release);
1048 mutex_unlock(&sr_ref_mutex);
1049
1050 return 0;
1051}
1052
1053static int __init init_sr(void)
1054{
1055 int rc;
1056
1057 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
1058 if (rc)
1059 return rc;
1060 rc = scsi_register_driver(&sr_template.gendrv);
1061 if (rc)
1062 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1063
1064 return rc;
1065}
1066
1067static void __exit exit_sr(void)
1068{
1069 scsi_unregister_driver(&sr_template.gendrv);
1070 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1071}
1072
1073module_init(init_sr);
1074module_exit(exit_sr);
1075MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * sr.c Copyright (C) 1992 David Giller
4 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
5 *
6 * adapted from:
7 * sd.c Copyright (C) 1992 Drew Eckhardt
8 * Linux scsi disk driver by
9 * Drew Eckhardt <drew@colorado.edu>
10 *
11 * Modified by Eric Youngdale ericy@andante.org to
12 * add scatter-gather, multiple outstanding request, and other
13 * enhancements.
14 *
15 * Modified by Eric Youngdale eric@andante.org to support loadable
16 * low-level scsi drivers.
17 *
18 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
19 * provide auto-eject.
20 *
21 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
22 * generic cdrom interface
23 *
24 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
25 * interface, capabilities probe additions, ioctl cleanups, etc.
26 *
27 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
28 *
29 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
30 * transparently and lose the GHOST hack
31 *
32 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
33 * check resource allocation in sr_init and some cleanups
34 */
35
36#include <linux/module.h>
37#include <linux/fs.h>
38#include <linux/kernel.h>
39#include <linux/mm.h>
40#include <linux/bio.h>
41#include <linux/compat.h>
42#include <linux/string.h>
43#include <linux/errno.h>
44#include <linux/cdrom.h>
45#include <linux/interrupt.h>
46#include <linux/init.h>
47#include <linux/major.h>
48#include <linux/blkdev.h>
49#include <linux/blk-pm.h>
50#include <linux/mutex.h>
51#include <linux/slab.h>
52#include <linux/pm_runtime.h>
53#include <linux/uaccess.h>
54
55#include <asm/unaligned.h>
56
57#include <scsi/scsi.h>
58#include <scsi/scsi_dbg.h>
59#include <scsi/scsi_device.h>
60#include <scsi/scsi_driver.h>
61#include <scsi/scsi_cmnd.h>
62#include <scsi/scsi_eh.h>
63#include <scsi/scsi_host.h>
64#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
65
66#include "scsi_logging.h"
67#include "sr.h"
68
69
70MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
71MODULE_LICENSE("GPL");
72MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
73MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
74MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
75
76#define SR_DISKS 256
77
78#define SR_CAPABILITIES \
79 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
80 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
81 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
82 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
83 CDC_MRW|CDC_MRW_W|CDC_RAM)
84
85static int sr_probe(struct device *);
86static int sr_remove(struct device *);
87static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt);
88static int sr_done(struct scsi_cmnd *);
89static int sr_runtime_suspend(struct device *dev);
90
91static const struct dev_pm_ops sr_pm_ops = {
92 .runtime_suspend = sr_runtime_suspend,
93};
94
95static struct scsi_driver sr_template = {
96 .gendrv = {
97 .name = "sr",
98 .owner = THIS_MODULE,
99 .probe = sr_probe,
100 .remove = sr_remove,
101 .pm = &sr_pm_ops,
102 },
103 .init_command = sr_init_command,
104 .done = sr_done,
105};
106
107static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
108static DEFINE_SPINLOCK(sr_index_lock);
109
110static struct lock_class_key sr_bio_compl_lkclass;
111
112static int sr_open(struct cdrom_device_info *, int);
113static void sr_release(struct cdrom_device_info *);
114
115static void get_sectorsize(struct scsi_cd *);
116static int get_capabilities(struct scsi_cd *);
117
118static unsigned int sr_check_events(struct cdrom_device_info *cdi,
119 unsigned int clearing, int slot);
120static int sr_packet(struct cdrom_device_info *, struct packet_command *);
121static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf,
122 u32 lba, u32 nr, u8 *last_sense);
123
124static const struct cdrom_device_ops sr_dops = {
125 .open = sr_open,
126 .release = sr_release,
127 .drive_status = sr_drive_status,
128 .check_events = sr_check_events,
129 .tray_move = sr_tray_move,
130 .lock_door = sr_lock_door,
131 .select_speed = sr_select_speed,
132 .get_last_session = sr_get_last_session,
133 .get_mcn = sr_get_mcn,
134 .reset = sr_reset,
135 .audio_ioctl = sr_audio_ioctl,
136 .generic_packet = sr_packet,
137 .read_cdda_bpc = sr_read_cdda_bpc,
138 .capability = SR_CAPABILITIES,
139};
140
141static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
142{
143 return disk->private_data;
144}
145
146static int sr_runtime_suspend(struct device *dev)
147{
148 struct scsi_cd *cd = dev_get_drvdata(dev);
149
150 if (!cd) /* E.g.: runtime suspend following sr_remove() */
151 return 0;
152
153 if (cd->media_present)
154 return -EBUSY;
155 else
156 return 0;
157}
158
159static unsigned int sr_get_events(struct scsi_device *sdev)
160{
161 u8 buf[8];
162 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
163 1, /* polled */
164 0, 0, /* reserved */
165 1 << 4, /* notification class: media */
166 0, 0, /* reserved */
167 0, sizeof(buf), /* allocation length */
168 0, /* control */
169 };
170 struct event_header *eh = (void *)buf;
171 struct media_event_desc *med = (void *)(buf + 4);
172 struct scsi_sense_hdr sshdr;
173 int result;
174
175 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf),
176 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL);
177 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
178 return DISK_EVENT_MEDIA_CHANGE;
179
180 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
181 return 0;
182
183 if (eh->nea || eh->notification_class != 0x4)
184 return 0;
185
186 if (med->media_event_code == 1)
187 return DISK_EVENT_EJECT_REQUEST;
188 else if (med->media_event_code == 2)
189 return DISK_EVENT_MEDIA_CHANGE;
190 else if (med->media_event_code == 3)
191 return DISK_EVENT_MEDIA_CHANGE;
192 return 0;
193}
194
195/*
196 * This function checks to see if the media has been changed or eject
197 * button has been pressed. It is possible that we have already
198 * sensed a change, or the drive may have sensed one and not yet
199 * reported it. The past events are accumulated in sdev->changed and
200 * returned together with the current state.
201 */
202static unsigned int sr_check_events(struct cdrom_device_info *cdi,
203 unsigned int clearing, int slot)
204{
205 struct scsi_cd *cd = cdi->handle;
206 bool last_present;
207 struct scsi_sense_hdr sshdr;
208 unsigned int events;
209 int ret;
210
211 /* no changer support */
212 if (CDSL_CURRENT != slot)
213 return 0;
214
215 events = sr_get_events(cd->device);
216 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
217
218 /*
219 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
220 * for several times in a row. We rely on TUR only for this likely
221 * broken device, to prevent generating incorrect media changed
222 * events for every open().
223 */
224 if (cd->ignore_get_event) {
225 events &= ~DISK_EVENT_MEDIA_CHANGE;
226 goto do_tur;
227 }
228
229 /*
230 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
231 * is being cleared. Note that there are devices which hang
232 * if asked to execute TUR repeatedly.
233 */
234 if (cd->device->changed) {
235 events |= DISK_EVENT_MEDIA_CHANGE;
236 cd->device->changed = 0;
237 cd->tur_changed = true;
238 }
239
240 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
241 return events;
242do_tur:
243 /* let's see whether the media is there with TUR */
244 last_present = cd->media_present;
245 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
246
247 /*
248 * Media is considered to be present if TUR succeeds or fails with
249 * sense data indicating something other than media-not-present
250 * (ASC 0x3a).
251 */
252 cd->media_present = scsi_status_is_good(ret) ||
253 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
254
255 if (last_present != cd->media_present)
256 cd->device->changed = 1;
257
258 if (cd->device->changed) {
259 events |= DISK_EVENT_MEDIA_CHANGE;
260 cd->device->changed = 0;
261 cd->tur_changed = true;
262 }
263
264 if (cd->ignore_get_event)
265 return events;
266
267 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
268 if (!cd->tur_changed) {
269 if (cd->get_event_changed) {
270 if (cd->tur_mismatch++ > 8) {
271 sr_printk(KERN_WARNING, cd,
272 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
273 cd->ignore_get_event = true;
274 }
275 } else {
276 cd->tur_mismatch = 0;
277 }
278 }
279 cd->tur_changed = false;
280 cd->get_event_changed = false;
281
282 return events;
283}
284
285/*
286 * sr_done is the interrupt routine for the device driver.
287 *
288 * It will be notified on the end of a SCSI read / write, and will take one
289 * of several actions based on success or failure.
290 */
291static int sr_done(struct scsi_cmnd *SCpnt)
292{
293 int result = SCpnt->result;
294 int this_count = scsi_bufflen(SCpnt);
295 int good_bytes = (result == 0 ? this_count : 0);
296 int block_sectors = 0;
297 long error_sector;
298 struct request *rq = scsi_cmd_to_rq(SCpnt);
299 struct scsi_cd *cd = scsi_cd(rq->q->disk);
300
301#ifdef DEBUG
302 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);
303#endif
304
305 /*
306 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
307 * success. Since this is a relatively rare error condition, no
308 * care is taken to avoid unnecessary additional work such as
309 * memcpy's that could be avoided.
310 */
311 if (scsi_status_is_check_condition(result) &&
312 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
313 switch (SCpnt->sense_buffer[2]) {
314 case MEDIUM_ERROR:
315 case VOLUME_OVERFLOW:
316 case ILLEGAL_REQUEST:
317 if (!(SCpnt->sense_buffer[0] & 0x90))
318 break;
319 error_sector =
320 get_unaligned_be32(&SCpnt->sense_buffer[3]);
321 if (rq->bio != NULL)
322 block_sectors = bio_sectors(rq->bio);
323 if (block_sectors < 4)
324 block_sectors = 4;
325 if (cd->device->sector_size == 2048)
326 error_sector <<= 2;
327 error_sector &= ~(block_sectors - 1);
328 good_bytes = (error_sector - blk_rq_pos(rq)) << 9;
329 if (good_bytes < 0 || good_bytes >= this_count)
330 good_bytes = 0;
331 /*
332 * The SCSI specification allows for the value
333 * returned by READ CAPACITY to be up to 75 2K
334 * sectors past the last readable block.
335 * Therefore, if we hit a medium error within the
336 * last 75 2K sectors, we decrease the saved size
337 * value.
338 */
339 if (error_sector < get_capacity(cd->disk) &&
340 cd->capacity - error_sector < 4 * 75)
341 set_capacity(cd->disk, error_sector);
342 break;
343
344 case RECOVERED_ERROR:
345 good_bytes = this_count;
346 break;
347
348 default:
349 break;
350 }
351 }
352
353 return good_bytes;
354}
355
356static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt)
357{
358 int block = 0, this_count, s_size;
359 struct scsi_cd *cd;
360 struct request *rq = scsi_cmd_to_rq(SCpnt);
361 blk_status_t ret;
362
363 ret = scsi_alloc_sgtables(SCpnt);
364 if (ret != BLK_STS_OK)
365 return ret;
366 cd = scsi_cd(rq->q->disk);
367
368 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
369 "Doing sr request, block = %d\n", block));
370
371 if (!cd->device || !scsi_device_online(cd->device)) {
372 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
373 "Finishing %u sectors\n", blk_rq_sectors(rq)));
374 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
375 "Retry with 0x%p\n", SCpnt));
376 goto out;
377 }
378
379 if (cd->device->changed) {
380 /*
381 * quietly refuse to do anything to a changed disc until the
382 * changed bit has been reset
383 */
384 goto out;
385 }
386
387 s_size = cd->device->sector_size;
388 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
389 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
390 goto out;
391 }
392
393 switch (req_op(rq)) {
394 case REQ_OP_WRITE:
395 if (!cd->writeable)
396 goto out;
397 SCpnt->cmnd[0] = WRITE_10;
398 cd->cdi.media_written = 1;
399 break;
400 case REQ_OP_READ:
401 SCpnt->cmnd[0] = READ_10;
402 break;
403 default:
404 blk_dump_rq_flags(rq, "Unknown sr command");
405 goto out;
406 }
407
408 {
409 struct scatterlist *sg;
410 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
411
412 scsi_for_each_sg(SCpnt, sg, sg_count, i)
413 size += sg->length;
414
415 if (size != scsi_bufflen(SCpnt)) {
416 scmd_printk(KERN_ERR, SCpnt,
417 "mismatch count %d, bytes %d\n",
418 size, scsi_bufflen(SCpnt));
419 if (scsi_bufflen(SCpnt) > size)
420 SCpnt->sdb.length = size;
421 }
422 }
423
424 /*
425 * request doesn't start on hw block boundary, add scatter pads
426 */
427 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
428 (scsi_bufflen(SCpnt) % s_size)) {
429 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
430 goto out;
431 }
432
433 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
434
435
436 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
437 "%s %d/%u 512 byte blocks.\n",
438 (rq_data_dir(rq) == WRITE) ?
439 "writing" : "reading",
440 this_count, blk_rq_sectors(rq)));
441
442 SCpnt->cmnd[1] = 0;
443 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
444
445 if (this_count > 0xffff) {
446 this_count = 0xffff;
447 SCpnt->sdb.length = this_count * s_size;
448 }
449
450 put_unaligned_be32(block, &SCpnt->cmnd[2]);
451 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
452 put_unaligned_be16(this_count, &SCpnt->cmnd[7]);
453
454 /*
455 * We shouldn't disconnect in the middle of a sector, so with a dumb
456 * host adapter, it's safe to assume that we can at least transfer
457 * this many bytes between each connect / disconnect.
458 */
459 SCpnt->transfersize = cd->device->sector_size;
460 SCpnt->underflow = this_count << 9;
461 SCpnt->allowed = MAX_RETRIES;
462 SCpnt->cmd_len = 10;
463
464 /*
465 * This indicates that the command is ready from our end to be queued.
466 */
467 return BLK_STS_OK;
468 out:
469 scsi_free_sgtables(SCpnt);
470 return BLK_STS_IOERR;
471}
472
473static void sr_revalidate_disk(struct scsi_cd *cd)
474{
475 struct scsi_sense_hdr sshdr;
476
477 /* if the unit is not ready, nothing more to do */
478 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
479 return;
480 sr_cd_check(&cd->cdi);
481 get_sectorsize(cd);
482}
483
484static int sr_block_open(struct block_device *bdev, fmode_t mode)
485{
486 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
487 struct scsi_device *sdev = cd->device;
488 int ret;
489
490 if (scsi_device_get(cd->device))
491 return -ENXIO;
492
493 scsi_autopm_get_device(sdev);
494 if (bdev_check_media_change(bdev))
495 sr_revalidate_disk(cd);
496
497 mutex_lock(&cd->lock);
498 ret = cdrom_open(&cd->cdi, bdev, mode);
499 mutex_unlock(&cd->lock);
500
501 scsi_autopm_put_device(sdev);
502 if (ret)
503 scsi_device_put(cd->device);
504 return ret;
505}
506
507static void sr_block_release(struct gendisk *disk, fmode_t mode)
508{
509 struct scsi_cd *cd = scsi_cd(disk);
510
511 mutex_lock(&cd->lock);
512 cdrom_release(&cd->cdi, mode);
513 mutex_unlock(&cd->lock);
514
515 scsi_device_put(cd->device);
516}
517
518static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
519 unsigned long arg)
520{
521 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
522 struct scsi_device *sdev = cd->device;
523 void __user *argp = (void __user *)arg;
524 int ret;
525
526 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO))
527 return -ENOIOCTLCMD;
528
529 mutex_lock(&cd->lock);
530
531 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
532 (mode & FMODE_NDELAY) != 0);
533 if (ret)
534 goto out;
535
536 scsi_autopm_get_device(sdev);
537
538 if (cmd != CDROMCLOSETRAY && cmd != CDROMEJECT) {
539 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
540 if (ret != -ENOSYS)
541 goto put;
542 }
543 ret = scsi_ioctl(sdev, mode, cmd, argp);
544
545put:
546 scsi_autopm_put_device(sdev);
547out:
548 mutex_unlock(&cd->lock);
549 return ret;
550}
551
552static unsigned int sr_block_check_events(struct gendisk *disk,
553 unsigned int clearing)
554{
555 struct scsi_cd *cd = disk->private_data;
556
557 if (atomic_read(&cd->device->disk_events_disable_depth))
558 return 0;
559 return cdrom_check_events(&cd->cdi, clearing);
560}
561
562static void sr_free_disk(struct gendisk *disk)
563{
564 struct scsi_cd *cd = disk->private_data;
565
566 spin_lock(&sr_index_lock);
567 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
568 spin_unlock(&sr_index_lock);
569
570 unregister_cdrom(&cd->cdi);
571 mutex_destroy(&cd->lock);
572 kfree(cd);
573}
574
575static const struct block_device_operations sr_bdops =
576{
577 .owner = THIS_MODULE,
578 .open = sr_block_open,
579 .release = sr_block_release,
580 .ioctl = sr_block_ioctl,
581 .compat_ioctl = blkdev_compat_ptr_ioctl,
582 .check_events = sr_block_check_events,
583 .free_disk = sr_free_disk,
584};
585
586static int sr_open(struct cdrom_device_info *cdi, int purpose)
587{
588 struct scsi_cd *cd = cdi->handle;
589 struct scsi_device *sdev = cd->device;
590 int retval;
591
592 /*
593 * If the device is in error recovery, wait until it is done.
594 * If the device is offline, then disallow any access to it.
595 */
596 retval = -ENXIO;
597 if (!scsi_block_when_processing_errors(sdev))
598 goto error_out;
599
600 return 0;
601
602error_out:
603 return retval;
604}
605
606static void sr_release(struct cdrom_device_info *cdi)
607{
608}
609
610static int sr_probe(struct device *dev)
611{
612 struct scsi_device *sdev = to_scsi_device(dev);
613 struct gendisk *disk;
614 struct scsi_cd *cd;
615 int minor, error;
616
617 scsi_autopm_get_device(sdev);
618 error = -ENODEV;
619 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
620 goto fail;
621
622 error = -ENOMEM;
623 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
624 if (!cd)
625 goto fail;
626
627 disk = blk_mq_alloc_disk_for_queue(sdev->request_queue,
628 &sr_bio_compl_lkclass);
629 if (!disk)
630 goto fail_free;
631 mutex_init(&cd->lock);
632
633 spin_lock(&sr_index_lock);
634 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
635 if (minor == SR_DISKS) {
636 spin_unlock(&sr_index_lock);
637 error = -EBUSY;
638 goto fail_put;
639 }
640 __set_bit(minor, sr_index_bits);
641 spin_unlock(&sr_index_lock);
642
643 disk->major = SCSI_CDROM_MAJOR;
644 disk->first_minor = minor;
645 disk->minors = 1;
646 sprintf(disk->disk_name, "sr%d", minor);
647 disk->fops = &sr_bdops;
648 disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART;
649 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
650 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT |
651 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE;
652
653 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
654
655 cd->device = sdev;
656 cd->disk = disk;
657 cd->capacity = 0x1fffff;
658 cd->device->changed = 1; /* force recheck CD type */
659 cd->media_present = 1;
660 cd->use = 1;
661 cd->readcd_known = 0;
662 cd->readcd_cdda = 0;
663
664 cd->cdi.ops = &sr_dops;
665 cd->cdi.handle = cd;
666 cd->cdi.mask = 0;
667 cd->cdi.capacity = 1;
668 sprintf(cd->cdi.name, "sr%d", minor);
669
670 sdev->sector_size = 2048; /* A guess, just in case */
671
672 error = -ENOMEM;
673 if (get_capabilities(cd))
674 goto fail_minor;
675 sr_vendor_init(cd);
676
677 set_capacity(disk, cd->capacity);
678 disk->private_data = cd;
679
680 if (register_cdrom(disk, &cd->cdi))
681 goto fail_minor;
682
683 /*
684 * Initialize block layer runtime PM stuffs before the
685 * periodic event checking request gets started in add_disk.
686 */
687 blk_pm_runtime_init(sdev->request_queue, dev);
688
689 dev_set_drvdata(dev, cd);
690 sr_revalidate_disk(cd);
691
692 error = device_add_disk(&sdev->sdev_gendev, disk, NULL);
693 if (error)
694 goto unregister_cdrom;
695
696 sdev_printk(KERN_DEBUG, sdev,
697 "Attached scsi CD-ROM %s\n", cd->cdi.name);
698 scsi_autopm_put_device(cd->device);
699
700 return 0;
701
702unregister_cdrom:
703 unregister_cdrom(&cd->cdi);
704fail_minor:
705 spin_lock(&sr_index_lock);
706 clear_bit(minor, sr_index_bits);
707 spin_unlock(&sr_index_lock);
708fail_put:
709 put_disk(disk);
710 mutex_destroy(&cd->lock);
711fail_free:
712 kfree(cd);
713fail:
714 scsi_autopm_put_device(sdev);
715 return error;
716}
717
718
719static void get_sectorsize(struct scsi_cd *cd)
720{
721 unsigned char cmd[10];
722 unsigned char buffer[8];
723 int the_result, retries = 3;
724 int sector_size;
725 struct request_queue *queue;
726
727 do {
728 cmd[0] = READ_CAPACITY;
729 memset((void *) &cmd[1], 0, 9);
730 memset(buffer, 0, sizeof(buffer));
731
732 /* Do the command and wait.. */
733 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
734 buffer, sizeof(buffer), NULL,
735 SR_TIMEOUT, MAX_RETRIES, NULL);
736
737 retries--;
738
739 } while (the_result && retries);
740
741
742 if (the_result) {
743 cd->capacity = 0x1fffff;
744 sector_size = 2048; /* A guess, just in case */
745 } else {
746 long last_written;
747
748 cd->capacity = 1 + get_unaligned_be32(&buffer[0]);
749 /*
750 * READ_CAPACITY doesn't return the correct size on
751 * certain UDF media. If last_written is larger, use
752 * it instead.
753 *
754 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
755 */
756 if (!cdrom_get_last_written(&cd->cdi, &last_written))
757 cd->capacity = max_t(long, cd->capacity, last_written);
758
759 sector_size = get_unaligned_be32(&buffer[4]);
760 switch (sector_size) {
761 /*
762 * HP 4020i CD-Recorder reports 2340 byte sectors
763 * Philips CD-Writers report 2352 byte sectors
764 *
765 * Use 2k sectors for them..
766 */
767 case 0:
768 case 2340:
769 case 2352:
770 sector_size = 2048;
771 fallthrough;
772 case 2048:
773 cd->capacity *= 4;
774 fallthrough;
775 case 512:
776 break;
777 default:
778 sr_printk(KERN_INFO, cd,
779 "unsupported sector size %d.", sector_size);
780 cd->capacity = 0;
781 }
782
783 cd->device->sector_size = sector_size;
784
785 /*
786 * Add this so that we have the ability to correctly gauge
787 * what the device is capable of.
788 */
789 set_capacity(cd->disk, cd->capacity);
790 }
791
792 queue = cd->device->request_queue;
793 blk_queue_logical_block_size(queue, sector_size);
794
795 return;
796}
797
798static int get_capabilities(struct scsi_cd *cd)
799{
800 unsigned char *buffer;
801 struct scsi_mode_data data;
802 struct scsi_sense_hdr sshdr;
803 unsigned int ms_len = 128;
804 int rc, n;
805
806 static const char *loadmech[] =
807 {
808 "caddy",
809 "tray",
810 "pop-up",
811 "",
812 "changer",
813 "cartridge changer",
814 "",
815 ""
816 };
817
818
819 /* allocate transfer buffer */
820 buffer = kmalloc(512, GFP_KERNEL);
821 if (!buffer) {
822 sr_printk(KERN_ERR, cd, "out of memory.\n");
823 return -ENOMEM;
824 }
825
826 /* eat unit attentions */
827 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
828
829 /* ask for mode page 0x2a */
830 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len,
831 SR_TIMEOUT, 3, &data, NULL);
832
833 if (rc < 0 || data.length > ms_len ||
834 data.header_length + data.block_descriptor_length > data.length) {
835 /* failed, drive doesn't have capabilities mode page */
836 cd->cdi.speed = 1;
837 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
838 CDC_DVD | CDC_DVD_RAM |
839 CDC_SELECT_DISC | CDC_SELECT_SPEED |
840 CDC_MRW | CDC_MRW_W | CDC_RAM);
841 kfree(buffer);
842 sr_printk(KERN_INFO, cd, "scsi-1 drive");
843 return 0;
844 }
845
846 n = data.header_length + data.block_descriptor_length;
847 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176;
848 cd->readcd_known = 1;
849 cd->readcd_cdda = buffer[n + 5] & 0x01;
850 /* print some capability bits */
851 sr_printk(KERN_INFO, cd,
852 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",
853 get_unaligned_be16(&buffer[n + 14]) / 176,
854 cd->cdi.speed,
855 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
856 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
857 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
858 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
859 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
860 loadmech[buffer[n + 6] >> 5]);
861 if ((buffer[n + 6] >> 5) == 0)
862 /* caddy drives can't close tray... */
863 cd->cdi.mask |= CDC_CLOSE_TRAY;
864 if ((buffer[n + 2] & 0x8) == 0)
865 /* not a DVD drive */
866 cd->cdi.mask |= CDC_DVD;
867 if ((buffer[n + 3] & 0x20) == 0)
868 /* can't write DVD-RAM media */
869 cd->cdi.mask |= CDC_DVD_RAM;
870 if ((buffer[n + 3] & 0x10) == 0)
871 /* can't write DVD-R media */
872 cd->cdi.mask |= CDC_DVD_R;
873 if ((buffer[n + 3] & 0x2) == 0)
874 /* can't write CD-RW media */
875 cd->cdi.mask |= CDC_CD_RW;
876 if ((buffer[n + 3] & 0x1) == 0)
877 /* can't write CD-R media */
878 cd->cdi.mask |= CDC_CD_R;
879 if ((buffer[n + 6] & 0x8) == 0)
880 /* can't eject */
881 cd->cdi.mask |= CDC_OPEN_TRAY;
882
883 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
884 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
885 cd->cdi.capacity =
886 cdrom_number_of_slots(&cd->cdi);
887 if (cd->cdi.capacity <= 1)
888 /* not a changer */
889 cd->cdi.mask |= CDC_SELECT_DISC;
890 /*else I don't think it can close its tray
891 cd->cdi.mask |= CDC_CLOSE_TRAY; */
892
893 /*
894 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
895 */
896 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
897 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
898 cd->writeable = 1;
899 }
900
901 kfree(buffer);
902 return 0;
903}
904
905/*
906 * sr_packet() is the entry point for the generic commands generated
907 * by the Uniform CD-ROM layer.
908 */
909static int sr_packet(struct cdrom_device_info *cdi,
910 struct packet_command *cgc)
911{
912 struct scsi_cd *cd = cdi->handle;
913 struct scsi_device *sdev = cd->device;
914
915 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
916 return -EDRIVE_CANT_DO_THIS;
917
918 if (cgc->timeout <= 0)
919 cgc->timeout = IOCTL_TIMEOUT;
920
921 sr_do_ioctl(cd, cgc);
922
923 return cgc->stat;
924}
925
926static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf,
927 u32 lba, u32 nr, u8 *last_sense)
928{
929 struct gendisk *disk = cdi->disk;
930 u32 len = nr * CD_FRAMESIZE_RAW;
931 struct scsi_cmnd *scmd;
932 struct request *rq;
933 struct bio *bio;
934 int ret;
935
936 rq = scsi_alloc_request(disk->queue, REQ_OP_DRV_IN, 0);
937 if (IS_ERR(rq))
938 return PTR_ERR(rq);
939 scmd = blk_mq_rq_to_pdu(rq);
940
941 ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL);
942 if (ret)
943 goto out_put_request;
944
945 scmd->cmnd[0] = GPCMD_READ_CD;
946 scmd->cmnd[1] = 1 << 2;
947 scmd->cmnd[2] = (lba >> 24) & 0xff;
948 scmd->cmnd[3] = (lba >> 16) & 0xff;
949 scmd->cmnd[4] = (lba >> 8) & 0xff;
950 scmd->cmnd[5] = lba & 0xff;
951 scmd->cmnd[6] = (nr >> 16) & 0xff;
952 scmd->cmnd[7] = (nr >> 8) & 0xff;
953 scmd->cmnd[8] = nr & 0xff;
954 scmd->cmnd[9] = 0xf8;
955 scmd->cmd_len = 12;
956 rq->timeout = 60 * HZ;
957 bio = rq->bio;
958
959 blk_execute_rq(rq, false);
960 if (scmd->result) {
961 struct scsi_sense_hdr sshdr;
962
963 scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len,
964 &sshdr);
965 *last_sense = sshdr.sense_key;
966 ret = -EIO;
967 }
968
969 if (blk_rq_unmap_user(bio))
970 ret = -EFAULT;
971out_put_request:
972 blk_mq_free_request(rq);
973 return ret;
974}
975
976static int sr_remove(struct device *dev)
977{
978 struct scsi_cd *cd = dev_get_drvdata(dev);
979
980 scsi_autopm_get_device(cd->device);
981
982 del_gendisk(cd->disk);
983 put_disk(cd->disk);
984
985 return 0;
986}
987
988static int __init init_sr(void)
989{
990 int rc;
991
992 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
993 if (rc)
994 return rc;
995 rc = scsi_register_driver(&sr_template.gendrv);
996 if (rc)
997 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
998
999 return rc;
1000}
1001
1002static void __exit exit_sr(void)
1003{
1004 scsi_unregister_driver(&sr_template.gendrv);
1005 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1006}
1007
1008module_init(init_sr);
1009module_exit(exit_sr);
1010MODULE_LICENSE("GPL");