Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/scsi/sr.c

  1 /*
  2  *  sr.c Copyright (C) 1992 David Giller
  3  *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
  4  *
  5  *  adapted from:
  6  *      sd.c Copyright (C) 1992 Drew Eckhardt
  7  *      Linux scsi disk driver by
  8  *              Drew Eckhardt <drew@colorado.edu>
  9  *
 10  *      Modified by Eric Youngdale ericy@andante.org to
 11  *      add scatter-gather, multiple outstanding request, and other
 12  *      enhancements.
 13  *
 14  *      Modified by Eric Youngdale eric@andante.org to support loadable
 15  *      low-level scsi drivers.
 16  *
 17  *      Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
 18  *      provide auto-eject.
 19  *
 20  *      Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
 21  *      generic cdrom interface
 22  *
 23  *      Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
 24  *      interface, capabilities probe additions, ioctl cleanups, etc.
 25  *
 26  *      Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
 27  *
 28  *      Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
 29  *      transparently and lose the GHOST hack
 30  *
 31  *      Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 32  *      check resource allocation in sr_init and some cleanups
 33  */
 34 
 35 #include <linux/module.h>
 36 #include <linux/fs.h>
 37 #include <linux/kernel.h>
 38 #include <linux/mm.h>
 39 #include <linux/bio.h>
 40 #include <linux/string.h>
 41 #include <linux/errno.h>
 42 #include <linux/cdrom.h>
 43 #include <linux/interrupt.h>
 44 #include <linux/init.h>
 45 #include <linux/blkdev.h>
 46 #include <linux/mutex.h>
 47 #include <linux/slab.h>
 48 #include <linux/pm_runtime.h>
 49 #include <asm/uaccess.h>
 50 
 51 #include <scsi/scsi.h>
 52 #include <scsi/scsi_dbg.h>
 53 #include <scsi/scsi_device.h>
 54 #include <scsi/scsi_driver.h>
 55 #include <scsi/scsi_cmnd.h>
 56 #include <scsi/scsi_eh.h>
 57 #include <scsi/scsi_host.h>
 58 #include <scsi/scsi_ioctl.h>    /* For the door lock/unlock commands */
 59 
 60 #include "scsi_logging.h"
 61 #include "sr.h"
 62 
 63 
 64 MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
 65 MODULE_LICENSE("GPL");
 66 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
 67 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
 68 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
 69 
 70 #define SR_DISKS        256
 71 
 72 #define SR_CAPABILITIES \
 73         (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
 74          CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
 75          CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
 76          CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
 77          CDC_MRW|CDC_MRW_W|CDC_RAM)
 78 
 79 static DEFINE_MUTEX(sr_mutex);
 80 static int sr_probe(struct device *);
 81 static int sr_remove(struct device *);
 82 static int sr_init_command(struct scsi_cmnd *SCpnt);
 83 static int sr_done(struct scsi_cmnd *);
 84 static int sr_runtime_suspend(struct device *dev);
 85 
 86 static struct dev_pm_ops sr_pm_ops = {
 87         .runtime_suspend        = sr_runtime_suspend,
 88 };
 89 
 90 static struct scsi_driver sr_template = {
 91         .owner                  = THIS_MODULE,
 92         .gendrv = {
 93                 .name           = "sr",
 94                 .probe          = sr_probe,
 95                 .remove         = sr_remove,
 96                 .pm             = &sr_pm_ops,
 97         },
 98         .init_command           = sr_init_command,
 99         .done                   = sr_done,
100 };
101 
102 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
103 static DEFINE_SPINLOCK(sr_index_lock);
104 
105 /* This semaphore is used to mediate the 0->1 reference get in the
106  * face of object destruction (i.e. we can't allow a get on an
107  * object after last put) */
108 static DEFINE_MUTEX(sr_ref_mutex);
109 
110 static int sr_open(struct cdrom_device_info *, int);
111 static void sr_release(struct cdrom_device_info *);
112 
113 static void get_sectorsize(struct scsi_cd *);
114 static void get_capabilities(struct scsi_cd *);
115 
116 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
117                                     unsigned int clearing, int slot);
118 static int sr_packet(struct cdrom_device_info *, struct packet_command *);
119 
120 static struct cdrom_device_ops sr_dops = {
121         .open                   = sr_open,
122         .release                = sr_release,
123         .drive_status           = sr_drive_status,
124         .check_events           = sr_check_events,
125         .tray_move              = sr_tray_move,
126         .lock_door              = sr_lock_door,
127         .select_speed           = sr_select_speed,
128         .get_last_session       = sr_get_last_session,
129         .get_mcn                = sr_get_mcn,
130         .reset                  = sr_reset,
131         .audio_ioctl            = sr_audio_ioctl,
132         .capability             = SR_CAPABILITIES,
133         .generic_packet         = sr_packet,
134 };
135 
136 static void sr_kref_release(struct kref *kref);
137 
138 static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
139 {
140         return container_of(disk->private_data, struct scsi_cd, driver);
141 }
142 
143 static int sr_runtime_suspend(struct device *dev)
144 {
145         struct scsi_cd *cd = dev_get_drvdata(dev);
146 
147         if (cd->media_present)
148                 return -EBUSY;
149         else
150                 return 0;
151 }
152 
153 /*
154  * The get and put routines for the struct scsi_cd.  Note this entity
155  * has a scsi_device pointer and owns a reference to this.
156  */
157 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
158 {
159         struct scsi_cd *cd = NULL;
160 
161         mutex_lock(&sr_ref_mutex);
162         if (disk->private_data == NULL)
163                 goto out;
164         cd = scsi_cd(disk);
165         kref_get(&cd->kref);
166         if (scsi_device_get(cd->device)) {
167                 kref_put(&cd->kref, sr_kref_release);
168                 cd = NULL;
169         }
170  out:
171         mutex_unlock(&sr_ref_mutex);
172         return cd;
173 }
174 
175 static void scsi_cd_put(struct scsi_cd *cd)
176 {
177         struct scsi_device *sdev = cd->device;
178 
179         mutex_lock(&sr_ref_mutex);
180         kref_put(&cd->kref, sr_kref_release);
181         scsi_device_put(sdev);
182         mutex_unlock(&sr_ref_mutex);
183 }
184 
185 static unsigned int sr_get_events(struct scsi_device *sdev)
186 {
187         u8 buf[8];
188         u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
189                      1,                 /* polled */
190                      0, 0,              /* reserved */
191                      1 << 4,            /* notification class: media */
192                      0, 0,              /* reserved */
193                      0, sizeof(buf),    /* allocation length */
194                      0,                 /* control */
195         };
196         struct event_header *eh = (void *)buf;
197         struct media_event_desc *med = (void *)(buf + 4);
198         struct scsi_sense_hdr sshdr;
199         int result;
200 
201         result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf),
202                                   &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL);
203         if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
204                 return DISK_EVENT_MEDIA_CHANGE;
205 
206         if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
207                 return 0;
208 
209         if (eh->nea || eh->notification_class != 0x4)
210                 return 0;
211 
212         if (med->media_event_code == 1)
213                 return DISK_EVENT_EJECT_REQUEST;
214         else if (med->media_event_code == 2)
215                 return DISK_EVENT_MEDIA_CHANGE;
216         return 0;
217 }
218 
219 /*
220  * This function checks to see if the media has been changed or eject
221  * button has been pressed.  It is possible that we have already
222  * sensed a change, or the drive may have sensed one and not yet
223  * reported it.  The past events are accumulated in sdev->changed and
224  * returned together with the current state.
225  */
226 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
227                                     unsigned int clearing, int slot)
228 {
229         struct scsi_cd *cd = cdi->handle;
230         bool last_present;
231         struct scsi_sense_hdr sshdr;
232         unsigned int events;
233         int ret;
234 
235         /* no changer support */
236         if (CDSL_CURRENT != slot)
237                 return 0;
238 
239         events = sr_get_events(cd->device);
240         cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
241 
242         /*
243          * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
244          * for several times in a row.  We rely on TUR only for this likely
245          * broken device, to prevent generating incorrect media changed
246          * events for every open().
247          */
248         if (cd->ignore_get_event) {
249                 events &= ~DISK_EVENT_MEDIA_CHANGE;
250                 goto do_tur;
251         }
252 
253         /*
254          * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
255          * is being cleared.  Note that there are devices which hang
256          * if asked to execute TUR repeatedly.
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 (!(clearing & DISK_EVENT_MEDIA_CHANGE))
265                 return events;
266 do_tur:
267         /* let's see whether the media is there with TUR */
268         last_present = cd->media_present;
269         ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
270 
271         /*
272          * Media is considered to be present if TUR succeeds or fails with
273          * sense data indicating something other than media-not-present
274          * (ASC 0x3a).
275          */
276         cd->media_present = scsi_status_is_good(ret) ||
277                 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
278 
279         if (last_present != cd->media_present)
280                 cd->device->changed = 1;
281 
282         if (cd->device->changed) {
283                 events |= DISK_EVENT_MEDIA_CHANGE;
284                 cd->device->changed = 0;
285                 cd->tur_changed = true;
286         }
287 
288         if (cd->ignore_get_event)
289                 return events;
290 
291         /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
292         if (!cd->tur_changed) {
293                 if (cd->get_event_changed) {
294                         if (cd->tur_mismatch++ > 8) {
295                                 sr_printk(KERN_WARNING, cd,
296                                           "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
297                                 cd->ignore_get_event = true;
298                         }
299                 } else {
300                         cd->tur_mismatch = 0;
301                 }
302         }
303         cd->tur_changed = false;
304         cd->get_event_changed = false;
305 
306         return events;
307 }
308 
309 /*
310  * sr_done is the interrupt routine for the device driver.
311  *
312  * It will be notified on the end of a SCSI read / write, and will take one
313  * of several actions based on success or failure.
314  */
315 static int sr_done(struct scsi_cmnd *SCpnt)
316 {
317         int result = SCpnt->result;
318         int this_count = scsi_bufflen(SCpnt);
319         int good_bytes = (result == 0 ? this_count : 0);
320         int block_sectors = 0;
321         long error_sector;
322         struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
323 
324 #ifdef DEBUG
325         scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);
326 #endif
327 
328         /*
329          * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
330          * success.  Since this is a relatively rare error condition, no
331          * care is taken to avoid unnecessary additional work such as
332          * memcpy's that could be avoided.
333          */
334         if (driver_byte(result) != 0 &&         /* An error occurred */
335             (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
336                 switch (SCpnt->sense_buffer[2]) {
337                 case MEDIUM_ERROR:
338                 case VOLUME_OVERFLOW:
339                 case ILLEGAL_REQUEST:
340                         if (!(SCpnt->sense_buffer[0] & 0x90))
341                                 break;
342                         error_sector = (SCpnt->sense_buffer[3] << 24) |
343                                 (SCpnt->sense_buffer[4] << 16) |
344                                 (SCpnt->sense_buffer[5] << 8) |
345                                 SCpnt->sense_buffer[6];
346                         if (SCpnt->request->bio != NULL)
347                                 block_sectors =
348                                         bio_sectors(SCpnt->request->bio);
349                         if (block_sectors < 4)
350                                 block_sectors = 4;
351                         if (cd->device->sector_size == 2048)
352                                 error_sector <<= 2;
353                         error_sector &= ~(block_sectors - 1);
354                         good_bytes = (error_sector -
355                                       blk_rq_pos(SCpnt->request)) << 9;
356                         if (good_bytes < 0 || good_bytes >= this_count)
357                                 good_bytes = 0;
358                         /*
359                          * The SCSI specification allows for the value
360                          * returned by READ CAPACITY to be up to 75 2K
361                          * sectors past the last readable block.
362                          * Therefore, if we hit a medium error within the
363                          * last 75 2K sectors, we decrease the saved size
364                          * value.
365                          */
366                         if (error_sector < get_capacity(cd->disk) &&
367                             cd->capacity - error_sector < 4 * 75)
368                                 set_capacity(cd->disk, error_sector);
369                         break;
370 
371                 case RECOVERED_ERROR:
372                         good_bytes = this_count;
373                         break;
374 
375                 default:
376                         break;
377                 }
378         }
379 
380         return good_bytes;
381 }
382 
383 static int sr_init_command(struct scsi_cmnd *SCpnt)
384 {
385         int block = 0, this_count, s_size;
386         struct scsi_cd *cd;
387         struct request *rq = SCpnt->request;
388         int ret;
389 
390         ret = scsi_init_io(SCpnt, GFP_ATOMIC);
391         if (ret != BLKPREP_OK)
392                 goto out;
393         SCpnt = rq->special;
394         cd = scsi_cd(rq->rq_disk);
395 
396         /* from here on until we're complete, any goto out
397          * is used for a killable error condition */
398         ret = BLKPREP_KILL;
399 
400         SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
401                 "Doing sr request, block = %d\n", block));
402 
403         if (!cd->device || !scsi_device_online(cd->device)) {
404                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
405                         "Finishing %u sectors\n", blk_rq_sectors(rq)));
406                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
407                         "Retry with 0x%p\n", SCpnt));
408                 goto out;
409         }
410 
411         if (cd->device->changed) {
412                 /*
413                  * quietly refuse to do anything to a changed disc until the
414                  * changed bit has been reset
415                  */
416                 goto out;
417         }
418 
419         /*
420          * we do lazy blocksize switching (when reading XA sectors,
421          * see CDROMREADMODE2 ioctl) 
422          */
423         s_size = cd->device->sector_size;
424         if (s_size > 2048) {
425                 if (!in_interrupt())
426                         sr_set_blocklength(cd, 2048);
427                 else
428                         scmd_printk(KERN_INFO, SCpnt,
429                                     "can't switch blocksize: in interrupt\n");
430         }
431 
432         if (s_size != 512 && s_size != 1024 && s_size != 2048) {
433                 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
434                 goto out;
435         }
436 
437         if (rq_data_dir(rq) == WRITE) {
438                 if (!cd->writeable)
439                         goto out;
440                 SCpnt->cmnd[0] = WRITE_10;
441                 cd->cdi.media_written = 1;
442         } else if (rq_data_dir(rq) == READ) {
443                 SCpnt->cmnd[0] = READ_10;
444         } else {
445                 blk_dump_rq_flags(rq, "Unknown sr command");
446                 goto out;
447         }
448 
449         {
450                 struct scatterlist *sg;
451                 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
452 
453                 scsi_for_each_sg(SCpnt, sg, sg_count, i)
454                         size += sg->length;
455 
456                 if (size != scsi_bufflen(SCpnt)) {
457                         scmd_printk(KERN_ERR, SCpnt,
458                                 "mismatch count %d, bytes %d\n",
459                                 size, scsi_bufflen(SCpnt));
460                         if (scsi_bufflen(SCpnt) > size)
461                                 SCpnt->sdb.length = size;
462                 }
463         }
464 
465         /*
466          * request doesn't start on hw block boundary, add scatter pads
467          */
468         if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
469             (scsi_bufflen(SCpnt) % s_size)) {
470                 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
471                 goto out;
472         }
473 
474         this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
475 
476 
477         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
478                                         "%s %d/%u 512 byte blocks.\n",
479                                         (rq_data_dir(rq) == WRITE) ?
480                                         "writing" : "reading",
481                                         this_count, blk_rq_sectors(rq)));
482 
483         SCpnt->cmnd[1] = 0;
484         block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
485 
486         if (this_count > 0xffff) {
487                 this_count = 0xffff;
488                 SCpnt->sdb.length = this_count * s_size;
489         }
490 
491         SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
492         SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
493         SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
494         SCpnt->cmnd[5] = (unsigned char) block & 0xff;
495         SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
496         SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
497         SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
498 
499         /*
500          * We shouldn't disconnect in the middle of a sector, so with a dumb
501          * host adapter, it's safe to assume that we can at least transfer
502          * this many bytes between each connect / disconnect.
503          */
504         SCpnt->transfersize = cd->device->sector_size;
505         SCpnt->underflow = this_count << 9;
506         SCpnt->allowed = MAX_RETRIES;
507 
508         /*
509          * This indicates that the command is ready from our end to be
510          * queued.
511          */
512         ret = BLKPREP_OK;
513  out:
514         return ret;
515 }
516 
517 static int sr_block_open(struct block_device *bdev, fmode_t mode)
518 {
519         struct scsi_cd *cd;
520         int ret = -ENXIO;
521 
522         mutex_lock(&sr_mutex);
523         cd = scsi_cd_get(bdev->bd_disk);
524         if (cd) {
525                 ret = cdrom_open(&cd->cdi, bdev, mode);
526                 if (ret)
527                         scsi_cd_put(cd);
528         }
529         mutex_unlock(&sr_mutex);
530         return ret;
531 }
532 
533 static void sr_block_release(struct gendisk *disk, fmode_t mode)
534 {
535         struct scsi_cd *cd = scsi_cd(disk);
536         mutex_lock(&sr_mutex);
537         cdrom_release(&cd->cdi, mode);
538         scsi_cd_put(cd);
539         mutex_unlock(&sr_mutex);
540 }
541 
542 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
543                           unsigned long arg)
544 {
545         struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
546         struct scsi_device *sdev = cd->device;
547         void __user *argp = (void __user *)arg;
548         int ret;
549 
550         mutex_lock(&sr_mutex);
551 
552         /*
553          * Send SCSI addressing ioctls directly to mid level, send other
554          * ioctls to cdrom/block level.
555          */
556         switch (cmd) {
557         case SCSI_IOCTL_GET_IDLUN:
558         case SCSI_IOCTL_GET_BUS_NUMBER:
559                 ret = scsi_ioctl(sdev, cmd, argp);
560                 goto out;
561         }
562 
563         ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
564         if (ret != -ENOSYS)
565                 goto out;
566 
567         /*
568          * ENODEV means that we didn't recognise the ioctl, or that we
569          * cannot execute it in the current device state.  In either
570          * case fall through to scsi_ioctl, which will return ENDOEV again
571          * if it doesn't recognise the ioctl
572          */
573         ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
574                                         (mode & FMODE_NDELAY) != 0);
575         if (ret != -ENODEV)
576                 goto out;
577         ret = scsi_ioctl(sdev, cmd, argp);
578 
579 out:
580         mutex_unlock(&sr_mutex);
581         return ret;
582 }
583 
584 static unsigned int sr_block_check_events(struct gendisk *disk,
585                                           unsigned int clearing)
586 {
587         struct scsi_cd *cd = scsi_cd(disk);
588 
589         if (atomic_read(&cd->device->disk_events_disable_depth))
590                 return 0;
591 
592         return cdrom_check_events(&cd->cdi, clearing);
593 }
594 
595 static int sr_block_revalidate_disk(struct gendisk *disk)
596 {
597         struct scsi_cd *cd = scsi_cd(disk);
598         struct scsi_sense_hdr sshdr;
599 
600         /* if the unit is not ready, nothing more to do */
601         if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
602                 goto out;
603 
604         sr_cd_check(&cd->cdi);
605         get_sectorsize(cd);
606 out:
607         return 0;
608 }
609 
610 static const struct block_device_operations sr_bdops =
611 {
612         .owner          = THIS_MODULE,
613         .open           = sr_block_open,
614         .release        = sr_block_release,
615         .ioctl          = sr_block_ioctl,
616         .check_events   = sr_block_check_events,
617         .revalidate_disk = sr_block_revalidate_disk,
618         /* 
619          * No compat_ioctl for now because sr_block_ioctl never
620          * seems to pass arbitrary ioctls down to host drivers.
621          */
622 };
623 
624 static int sr_open(struct cdrom_device_info *cdi, int purpose)
625 {
626         struct scsi_cd *cd = cdi->handle;
627         struct scsi_device *sdev = cd->device;
628         int retval;
629 
630         /*
631          * If the device is in error recovery, wait until it is done.
632          * If the device is offline, then disallow any access to it.
633          */
634         retval = -ENXIO;
635         if (!scsi_block_when_processing_errors(sdev))
636                 goto error_out;
637 
638         return 0;
639 
640 error_out:
641         return retval;  
642 }
643 
644 static void sr_release(struct cdrom_device_info *cdi)
645 {
646         struct scsi_cd *cd = cdi->handle;
647 
648         if (cd->device->sector_size > 2048)
649                 sr_set_blocklength(cd, 2048);
650 
651 }
652 
653 static int sr_probe(struct device *dev)
654 {
655         struct scsi_device *sdev = to_scsi_device(dev);
656         struct gendisk *disk;
657         struct scsi_cd *cd;
658         int minor, error;
659 
660         error = -ENODEV;
661         if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
662                 goto fail;
663 
664         error = -ENOMEM;
665         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
666         if (!cd)
667                 goto fail;
668 
669         kref_init(&cd->kref);
670 
671         disk = alloc_disk(1);
672         if (!disk)
673                 goto fail_free;
674 
675         spin_lock(&sr_index_lock);
676         minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
677         if (minor == SR_DISKS) {
678                 spin_unlock(&sr_index_lock);
679                 error = -EBUSY;
680                 goto fail_put;
681         }
682         __set_bit(minor, sr_index_bits);
683         spin_unlock(&sr_index_lock);
684 
685         disk->major = SCSI_CDROM_MAJOR;
686         disk->first_minor = minor;
687         sprintf(disk->disk_name, "sr%d", minor);
688         disk->fops = &sr_bdops;
689         disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
690         disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
691 
692         blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
693 
694         cd->device = sdev;
695         cd->disk = disk;
696         cd->driver = &sr_template;
697         cd->disk = disk;
698         cd->capacity = 0x1fffff;
699         cd->device->changed = 1;        /* force recheck CD type */
700         cd->media_present = 1;
701         cd->use = 1;
702         cd->readcd_known = 0;
703         cd->readcd_cdda = 0;
704 
705         cd->cdi.ops = &sr_dops;
706         cd->cdi.handle = cd;
707         cd->cdi.mask = 0;
708         cd->cdi.capacity = 1;
709         sprintf(cd->cdi.name, "sr%d", minor);
710 
711         sdev->sector_size = 2048;       /* A guess, just in case */
712 
713         /* FIXME: need to handle a get_capabilities failure properly ?? */
714         get_capabilities(cd);
715         sr_vendor_init(cd);
716 
717         disk->driverfs_dev = &sdev->sdev_gendev;
718         set_capacity(disk, cd->capacity);
719         disk->private_data = &cd->driver;
720         disk->queue = sdev->request_queue;
721         cd->cdi.disk = disk;
722 
723         if (register_cdrom(&cd->cdi))
724                 goto fail_put;
725 
726         /*
727          * Initialize block layer runtime PM stuffs before the
728          * periodic event checking request gets started in add_disk.
729          */
730         blk_pm_runtime_init(sdev->request_queue, dev);
731 
732         dev_set_drvdata(dev, cd);
733         disk->flags |= GENHD_FL_REMOVABLE;
734         add_disk(disk);
735 
736         sdev_printk(KERN_DEBUG, sdev,
737                     "Attached scsi CD-ROM %s\n", cd->cdi.name);
738         scsi_autopm_put_device(cd->device);
739 
740         return 0;
741 
742 fail_put:
743         put_disk(disk);
744 fail_free:
745         kfree(cd);
746 fail:
747         return error;
748 }
749 
750 
751 static void get_sectorsize(struct scsi_cd *cd)
752 {
753         unsigned char cmd[10];
754         unsigned char buffer[8];
755         int the_result, retries = 3;
756         int sector_size;
757         struct request_queue *queue;
758 
759         do {
760                 cmd[0] = READ_CAPACITY;
761                 memset((void *) &cmd[1], 0, 9);
762                 memset(buffer, 0, sizeof(buffer));
763 
764                 /* Do the command and wait.. */
765                 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
766                                               buffer, sizeof(buffer), NULL,
767                                               SR_TIMEOUT, MAX_RETRIES, NULL);
768 
769                 retries--;
770 
771         } while (the_result && retries);
772 
773 
774         if (the_result) {
775                 cd->capacity = 0x1fffff;
776                 sector_size = 2048;     /* A guess, just in case */
777         } else {
778                 long last_written;
779 
780                 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) |
781                                     (buffer[2] << 8) | buffer[3]);
782                 /*
783                  * READ_CAPACITY doesn't return the correct size on
784                  * certain UDF media.  If last_written is larger, use
785                  * it instead.
786                  *
787                  * http://bugzilla.kernel.org/show_bug.cgi?id=9668
788                  */
789                 if (!cdrom_get_last_written(&cd->cdi, &last_written))
790                         cd->capacity = max_t(long, cd->capacity, last_written);
791 
792                 sector_size = (buffer[4] << 24) |
793                     (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
794                 switch (sector_size) {
795                         /*
796                          * HP 4020i CD-Recorder reports 2340 byte sectors
797                          * Philips CD-Writers report 2352 byte sectors
798                          *
799                          * Use 2k sectors for them..
800                          */
801                 case 0:
802                 case 2340:
803                 case 2352:
804                         sector_size = 2048;
805                         /* fall through */
806                 case 2048:
807                         cd->capacity *= 4;
808                         /* fall through */
809                 case 512:
810                         break;
811                 default:
812                         sr_printk(KERN_INFO, cd,
813                                   "unsupported sector size %d.", sector_size);
814                         cd->capacity = 0;
815                 }
816 
817                 cd->device->sector_size = sector_size;
818 
819                 /*
820                  * Add this so that we have the ability to correctly gauge
821                  * what the device is capable of.
822                  */
823                 set_capacity(cd->disk, cd->capacity);
824         }
825 
826         queue = cd->device->request_queue;
827         blk_queue_logical_block_size(queue, sector_size);
828 
829         return;
830 }
831 
832 static void get_capabilities(struct scsi_cd *cd)
833 {
834         unsigned char *buffer;
835         struct scsi_mode_data data;
836         struct scsi_sense_hdr sshdr;
837         int rc, n;
838 
839         static const char *loadmech[] =
840         {
841                 "caddy",
842                 "tray",
843                 "pop-up",
844                 "",
845                 "changer",
846                 "cartridge changer",
847                 "",
848                 ""
849         };
850 
851 
852         /* allocate transfer buffer */
853         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
854         if (!buffer) {
855                 sr_printk(KERN_ERR, cd, "out of memory.\n");
856                 return;
857         }
858 
859         /* eat unit attentions */
860         scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
861 
862         /* ask for mode page 0x2a */
863         rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
864                              SR_TIMEOUT, 3, &data, NULL);
865 
866         if (!scsi_status_is_good(rc)) {
867                 /* failed, drive doesn't have capabilities mode page */
868                 cd->cdi.speed = 1;
869                 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
870                                  CDC_DVD | CDC_DVD_RAM |
871                                  CDC_SELECT_DISC | CDC_SELECT_SPEED |
872                                  CDC_MRW | CDC_MRW_W | CDC_RAM);
873                 kfree(buffer);
874                 sr_printk(KERN_INFO, cd, "scsi-1 drive");
875                 return;
876         }
877 
878         n = data.header_length + data.block_descriptor_length;
879         cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
880         cd->readcd_known = 1;
881         cd->readcd_cdda = buffer[n + 5] & 0x01;
882         /* print some capability bits */
883         sr_printk(KERN_INFO, cd,
884                   "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",
885                   ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
886                   cd->cdi.speed,
887                   buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
888                   buffer[n + 3] & 0x20 ? "dvd-ram " : "",
889                   buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
890                   buffer[n + 4] & 0x20 ? "xa/form2 " : "",      /* can read xa/from2 */
891                   buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
892                   loadmech[buffer[n + 6] >> 5]);
893         if ((buffer[n + 6] >> 5) == 0)
894                 /* caddy drives can't close tray... */
895                 cd->cdi.mask |= CDC_CLOSE_TRAY;
896         if ((buffer[n + 2] & 0x8) == 0)
897                 /* not a DVD drive */
898                 cd->cdi.mask |= CDC_DVD;
899         if ((buffer[n + 3] & 0x20) == 0)
900                 /* can't write DVD-RAM media */
901                 cd->cdi.mask |= CDC_DVD_RAM;
902         if ((buffer[n + 3] & 0x10) == 0)
903                 /* can't write DVD-R media */
904                 cd->cdi.mask |= CDC_DVD_R;
905         if ((buffer[n + 3] & 0x2) == 0)
906                 /* can't write CD-RW media */
907                 cd->cdi.mask |= CDC_CD_RW;
908         if ((buffer[n + 3] & 0x1) == 0)
909                 /* can't write CD-R media */
910                 cd->cdi.mask |= CDC_CD_R;
911         if ((buffer[n + 6] & 0x8) == 0)
912                 /* can't eject */
913                 cd->cdi.mask |= CDC_OPEN_TRAY;
914 
915         if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
916             (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
917                 cd->cdi.capacity =
918                     cdrom_number_of_slots(&cd->cdi);
919         if (cd->cdi.capacity <= 1)
920                 /* not a changer */
921                 cd->cdi.mask |= CDC_SELECT_DISC;
922         /*else    I don't think it can close its tray
923                 cd->cdi.mask |= CDC_CLOSE_TRAY; */
924 
925         /*
926          * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
927          */
928         if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
929                         (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
930                 cd->writeable = 1;
931         }
932 
933         kfree(buffer);
934 }
935 
936 /*
937  * sr_packet() is the entry point for the generic commands generated
938  * by the Uniform CD-ROM layer.
939  */
940 static int sr_packet(struct cdrom_device_info *cdi,
941                 struct packet_command *cgc)
942 {
943         struct scsi_cd *cd = cdi->handle;
944         struct scsi_device *sdev = cd->device;
945 
946         if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
947                 return -EDRIVE_CANT_DO_THIS;
948 
949         if (cgc->timeout <= 0)
950                 cgc->timeout = IOCTL_TIMEOUT;
951 
952         sr_do_ioctl(cd, cgc);
953 
954         return cgc->stat;
955 }
956 
957 /**
958  *      sr_kref_release - Called to free the scsi_cd structure
959  *      @kref: pointer to embedded kref
960  *
961  *      sr_ref_mutex must be held entering this routine.  Because it is
962  *      called on last put, you should always use the scsi_cd_get()
963  *      scsi_cd_put() helpers which manipulate the semaphore directly
964  *      and never do a direct kref_put().
965  **/
966 static void sr_kref_release(struct kref *kref)
967 {
968         struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
969         struct gendisk *disk = cd->disk;
970 
971         spin_lock(&sr_index_lock);
972         clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
973         spin_unlock(&sr_index_lock);
974 
975         unregister_cdrom(&cd->cdi);
976 
977         disk->private_data = NULL;
978 
979         put_disk(disk);
980 
981         kfree(cd);
982 }
983 
984 static int sr_remove(struct device *dev)
985 {
986         struct scsi_cd *cd = dev_get_drvdata(dev);
987 
988         scsi_autopm_get_device(cd->device);
989 
990         del_gendisk(cd->disk);
991 
992         mutex_lock(&sr_ref_mutex);
993         kref_put(&cd->kref, sr_kref_release);
994         mutex_unlock(&sr_ref_mutex);
995 
996         return 0;
997 }
998 
999 static int __init init_sr(void)
1000 {
1001         int rc;
1002 
1003         rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
1004         if (rc)
1005                 return rc;
1006         rc = scsi_register_driver(&sr_template.gendrv);
1007         if (rc)
1008                 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1009 
1010         return rc;
1011 }
1012 
1013 static void __exit exit_sr(void)
1014 {
1015         scsi_unregister_driver(&sr_template.gendrv);
1016         unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1017 }
1018 
1019 module_init(init_sr);
1020 module_exit(exit_sr);
1021 MODULE_LICENSE("GPL");
1022 

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