Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

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         .gendrv = {
 92                 .name           = "sr",
 93                 .owner          = THIS_MODULE,
 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)        /* E.g.: runtime suspend following sr_remove() */
148                 return 0;
149 
150         if (cd->media_present)
151                 return -EBUSY;
152         else
153                 return 0;
154 }
155 
156 /*
157  * The get and put routines for the struct scsi_cd.  Note this entity
158  * has a scsi_device pointer and owns a reference to this.
159  */
160 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
161 {
162         struct scsi_cd *cd = NULL;
163 
164         mutex_lock(&sr_ref_mutex);
165         if (disk->private_data == NULL)
166                 goto out;
167         cd = scsi_cd(disk);
168         kref_get(&cd->kref);
169         if (scsi_device_get(cd->device)) {
170                 kref_put(&cd->kref, sr_kref_release);
171                 cd = NULL;
172         }
173  out:
174         mutex_unlock(&sr_ref_mutex);
175         return cd;
176 }
177 
178 static void scsi_cd_put(struct scsi_cd *cd)
179 {
180         struct scsi_device *sdev = cd->device;
181 
182         mutex_lock(&sr_ref_mutex);
183         kref_put(&cd->kref, sr_kref_release);
184         scsi_device_put(sdev);
185         mutex_unlock(&sr_ref_mutex);
186 }
187 
188 static unsigned int sr_get_events(struct scsi_device *sdev)
189 {
190         u8 buf[8];
191         u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
192                      1,                 /* polled */
193                      0, 0,              /* reserved */
194                      1 << 4,            /* notification class: media */
195                      0, 0,              /* reserved */
196                      0, sizeof(buf),    /* allocation length */
197                      0,                 /* control */
198         };
199         struct event_header *eh = (void *)buf;
200         struct media_event_desc *med = (void *)(buf + 4);
201         struct scsi_sense_hdr sshdr;
202         int result;
203 
204         result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf),
205                                   &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL);
206         if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
207                 return DISK_EVENT_MEDIA_CHANGE;
208 
209         if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
210                 return 0;
211 
212         if (eh->nea || eh->notification_class != 0x4)
213                 return 0;
214 
215         if (med->media_event_code == 1)
216                 return DISK_EVENT_EJECT_REQUEST;
217         else if (med->media_event_code == 2)
218                 return DISK_EVENT_MEDIA_CHANGE;
219         return 0;
220 }
221 
222 /*
223  * This function checks to see if the media has been changed or eject
224  * button has been pressed.  It is possible that we have already
225  * sensed a change, or the drive may have sensed one and not yet
226  * reported it.  The past events are accumulated in sdev->changed and
227  * returned together with the current state.
228  */
229 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
230                                     unsigned int clearing, int slot)
231 {
232         struct scsi_cd *cd = cdi->handle;
233         bool last_present;
234         struct scsi_sense_hdr sshdr;
235         unsigned int events;
236         int ret;
237 
238         /* no changer support */
239         if (CDSL_CURRENT != slot)
240                 return 0;
241 
242         events = sr_get_events(cd->device);
243         cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
244 
245         /*
246          * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
247          * for several times in a row.  We rely on TUR only for this likely
248          * broken device, to prevent generating incorrect media changed
249          * events for every open().
250          */
251         if (cd->ignore_get_event) {
252                 events &= ~DISK_EVENT_MEDIA_CHANGE;
253                 goto do_tur;
254         }
255 
256         /*
257          * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
258          * is being cleared.  Note that there are devices which hang
259          * if asked to execute TUR repeatedly.
260          */
261         if (cd->device->changed) {
262                 events |= DISK_EVENT_MEDIA_CHANGE;
263                 cd->device->changed = 0;
264                 cd->tur_changed = true;
265         }
266 
267         if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
268                 return events;
269 do_tur:
270         /* let's see whether the media is there with TUR */
271         last_present = cd->media_present;
272         ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
273 
274         /*
275          * Media is considered to be present if TUR succeeds or fails with
276          * sense data indicating something other than media-not-present
277          * (ASC 0x3a).
278          */
279         cd->media_present = scsi_status_is_good(ret) ||
280                 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
281 
282         if (last_present != cd->media_present)
283                 cd->device->changed = 1;
284 
285         if (cd->device->changed) {
286                 events |= DISK_EVENT_MEDIA_CHANGE;
287                 cd->device->changed = 0;
288                 cd->tur_changed = true;
289         }
290 
291         if (cd->ignore_get_event)
292                 return events;
293 
294         /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
295         if (!cd->tur_changed) {
296                 if (cd->get_event_changed) {
297                         if (cd->tur_mismatch++ > 8) {
298                                 sr_printk(KERN_WARNING, cd,
299                                           "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
300                                 cd->ignore_get_event = true;
301                         }
302                 } else {
303                         cd->tur_mismatch = 0;
304                 }
305         }
306         cd->tur_changed = false;
307         cd->get_event_changed = false;
308 
309         return events;
310 }
311 
312 /*
313  * sr_done is the interrupt routine for the device driver.
314  *
315  * It will be notified on the end of a SCSI read / write, and will take one
316  * of several actions based on success or failure.
317  */
318 static int sr_done(struct scsi_cmnd *SCpnt)
319 {
320         int result = SCpnt->result;
321         int this_count = scsi_bufflen(SCpnt);
322         int good_bytes = (result == 0 ? this_count : 0);
323         int block_sectors = 0;
324         long error_sector;
325         struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
326 
327 #ifdef DEBUG
328         scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);
329 #endif
330 
331         /*
332          * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
333          * success.  Since this is a relatively rare error condition, no
334          * care is taken to avoid unnecessary additional work such as
335          * memcpy's that could be avoided.
336          */
337         if (driver_byte(result) != 0 &&         /* An error occurred */
338             (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
339                 switch (SCpnt->sense_buffer[2]) {
340                 case MEDIUM_ERROR:
341                 case VOLUME_OVERFLOW:
342                 case ILLEGAL_REQUEST:
343                         if (!(SCpnt->sense_buffer[0] & 0x90))
344                                 break;
345                         error_sector = (SCpnt->sense_buffer[3] << 24) |
346                                 (SCpnt->sense_buffer[4] << 16) |
347                                 (SCpnt->sense_buffer[5] << 8) |
348                                 SCpnt->sense_buffer[6];
349                         if (SCpnt->request->bio != NULL)
350                                 block_sectors =
351                                         bio_sectors(SCpnt->request->bio);
352                         if (block_sectors < 4)
353                                 block_sectors = 4;
354                         if (cd->device->sector_size == 2048)
355                                 error_sector <<= 2;
356                         error_sector &= ~(block_sectors - 1);
357                         good_bytes = (error_sector -
358                                       blk_rq_pos(SCpnt->request)) << 9;
359                         if (good_bytes < 0 || good_bytes >= this_count)
360                                 good_bytes = 0;
361                         /*
362                          * The SCSI specification allows for the value
363                          * returned by READ CAPACITY to be up to 75 2K
364                          * sectors past the last readable block.
365                          * Therefore, if we hit a medium error within the
366                          * last 75 2K sectors, we decrease the saved size
367                          * value.
368                          */
369                         if (error_sector < get_capacity(cd->disk) &&
370                             cd->capacity - error_sector < 4 * 75)
371                                 set_capacity(cd->disk, error_sector);
372                         break;
373 
374                 case RECOVERED_ERROR:
375                         good_bytes = this_count;
376                         break;
377 
378                 default:
379                         break;
380                 }
381         }
382 
383         return good_bytes;
384 }
385 
386 static int sr_init_command(struct scsi_cmnd *SCpnt)
387 {
388         int block = 0, this_count, s_size;
389         struct scsi_cd *cd;
390         struct request *rq = SCpnt->request;
391         int ret;
392 
393         ret = scsi_init_io(SCpnt);
394         if (ret != BLKPREP_OK)
395                 goto out;
396         SCpnt = rq->special;
397         cd = scsi_cd(rq->rq_disk);
398 
399         /* from here on until we're complete, any goto out
400          * is used for a killable error condition */
401         ret = BLKPREP_KILL;
402 
403         SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
404                 "Doing sr request, block = %d\n", block));
405 
406         if (!cd->device || !scsi_device_online(cd->device)) {
407                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
408                         "Finishing %u sectors\n", blk_rq_sectors(rq)));
409                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
410                         "Retry with 0x%p\n", SCpnt));
411                 goto out;
412         }
413 
414         if (cd->device->changed) {
415                 /*
416                  * quietly refuse to do anything to a changed disc until the
417                  * changed bit has been reset
418                  */
419                 goto out;
420         }
421 
422         /*
423          * we do lazy blocksize switching (when reading XA sectors,
424          * see CDROMREADMODE2 ioctl) 
425          */
426         s_size = cd->device->sector_size;
427         if (s_size > 2048) {
428                 if (!in_interrupt())
429                         sr_set_blocklength(cd, 2048);
430                 else
431                         scmd_printk(KERN_INFO, SCpnt,
432                                     "can't switch blocksize: in interrupt\n");
433         }
434 
435         if (s_size != 512 && s_size != 1024 && s_size != 2048) {
436                 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
437                 goto out;
438         }
439 
440         if (rq_data_dir(rq) == WRITE) {
441                 if (!cd->writeable)
442                         goto out;
443                 SCpnt->cmnd[0] = WRITE_10;
444                 cd->cdi.media_written = 1;
445         } else if (rq_data_dir(rq) == READ) {
446                 SCpnt->cmnd[0] = READ_10;
447         } else {
448                 blk_dump_rq_flags(rq, "Unknown sr command");
449                 goto out;
450         }
451 
452         {
453                 struct scatterlist *sg;
454                 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
455 
456                 scsi_for_each_sg(SCpnt, sg, sg_count, i)
457                         size += sg->length;
458 
459                 if (size != scsi_bufflen(SCpnt)) {
460                         scmd_printk(KERN_ERR, SCpnt,
461                                 "mismatch count %d, bytes %d\n",
462                                 size, scsi_bufflen(SCpnt));
463                         if (scsi_bufflen(SCpnt) > size)
464                                 SCpnt->sdb.length = size;
465                 }
466         }
467 
468         /*
469          * request doesn't start on hw block boundary, add scatter pads
470          */
471         if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
472             (scsi_bufflen(SCpnt) % s_size)) {
473                 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
474                 goto out;
475         }
476 
477         this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
478 
479 
480         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
481                                         "%s %d/%u 512 byte blocks.\n",
482                                         (rq_data_dir(rq) == WRITE) ?
483                                         "writing" : "reading",
484                                         this_count, blk_rq_sectors(rq)));
485 
486         SCpnt->cmnd[1] = 0;
487         block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
488 
489         if (this_count > 0xffff) {
490                 this_count = 0xffff;
491                 SCpnt->sdb.length = this_count * s_size;
492         }
493 
494         SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
495         SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
496         SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
497         SCpnt->cmnd[5] = (unsigned char) block & 0xff;
498         SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
499         SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
500         SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
501 
502         /*
503          * We shouldn't disconnect in the middle of a sector, so with a dumb
504          * host adapter, it's safe to assume that we can at least transfer
505          * this many bytes between each connect / disconnect.
506          */
507         SCpnt->transfersize = cd->device->sector_size;
508         SCpnt->underflow = this_count << 9;
509         SCpnt->allowed = MAX_RETRIES;
510 
511         /*
512          * This indicates that the command is ready from our end to be
513          * queued.
514          */
515         ret = BLKPREP_OK;
516  out:
517         return ret;
518 }
519 
520 static int sr_block_open(struct block_device *bdev, fmode_t mode)
521 {
522         struct scsi_cd *cd;
523         int ret = -ENXIO;
524 
525         mutex_lock(&sr_mutex);
526         cd = scsi_cd_get(bdev->bd_disk);
527         if (cd) {
528                 ret = cdrom_open(&cd->cdi, bdev, mode);
529                 if (ret)
530                         scsi_cd_put(cd);
531         }
532         mutex_unlock(&sr_mutex);
533         return ret;
534 }
535 
536 static void sr_block_release(struct gendisk *disk, fmode_t mode)
537 {
538         struct scsi_cd *cd = scsi_cd(disk);
539         mutex_lock(&sr_mutex);
540         cdrom_release(&cd->cdi, mode);
541         scsi_cd_put(cd);
542         mutex_unlock(&sr_mutex);
543 }
544 
545 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
546                           unsigned long arg)
547 {
548         struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
549         struct scsi_device *sdev = cd->device;
550         void __user *argp = (void __user *)arg;
551         int ret;
552 
553         mutex_lock(&sr_mutex);
554 
555         ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
556                         (mode & FMODE_NDELAY) != 0);
557         if (ret)
558                 goto out;
559 
560         /*
561          * Send SCSI addressing ioctls directly to mid level, send other
562          * ioctls to cdrom/block level.
563          */
564         switch (cmd) {
565         case SCSI_IOCTL_GET_IDLUN:
566         case SCSI_IOCTL_GET_BUS_NUMBER:
567                 ret = scsi_ioctl(sdev, cmd, argp);
568                 goto out;
569         }
570 
571         ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
572         if (ret != -ENOSYS)
573                 goto out;
574 
575         ret = scsi_ioctl(sdev, cmd, argp);
576 
577 out:
578         mutex_unlock(&sr_mutex);
579         return ret;
580 }
581 
582 static unsigned int sr_block_check_events(struct gendisk *disk,
583                                           unsigned int clearing)
584 {
585         struct scsi_cd *cd = scsi_cd(disk);
586 
587         if (atomic_read(&cd->device->disk_events_disable_depth))
588                 return 0;
589 
590         return cdrom_check_events(&cd->cdi, clearing);
591 }
592 
593 static int sr_block_revalidate_disk(struct gendisk *disk)
594 {
595         struct scsi_cd *cd = scsi_cd(disk);
596         struct scsi_sense_hdr sshdr;
597 
598         /* if the unit is not ready, nothing more to do */
599         if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
600                 goto out;
601 
602         sr_cd_check(&cd->cdi);
603         get_sectorsize(cd);
604 out:
605         return 0;
606 }
607 
608 static const struct block_device_operations sr_bdops =
609 {
610         .owner          = THIS_MODULE,
611         .open           = sr_block_open,
612         .release        = sr_block_release,
613         .ioctl          = sr_block_ioctl,
614         .check_events   = sr_block_check_events,
615         .revalidate_disk = sr_block_revalidate_disk,
616         /* 
617          * No compat_ioctl for now because sr_block_ioctl never
618          * seems to pass arbitrary ioctls down to host drivers.
619          */
620 };
621 
622 static int sr_open(struct cdrom_device_info *cdi, int purpose)
623 {
624         struct scsi_cd *cd = cdi->handle;
625         struct scsi_device *sdev = cd->device;
626         int retval;
627 
628         /*
629          * If the device is in error recovery, wait until it is done.
630          * If the device is offline, then disallow any access to it.
631          */
632         retval = -ENXIO;
633         if (!scsi_block_when_processing_errors(sdev))
634                 goto error_out;
635 
636         return 0;
637 
638 error_out:
639         return retval;  
640 }
641 
642 static void sr_release(struct cdrom_device_info *cdi)
643 {
644         struct scsi_cd *cd = cdi->handle;
645 
646         if (cd->device->sector_size > 2048)
647                 sr_set_blocklength(cd, 2048);
648 
649 }
650 
651 static int sr_probe(struct device *dev)
652 {
653         struct scsi_device *sdev = to_scsi_device(dev);
654         struct gendisk *disk;
655         struct scsi_cd *cd;
656         int minor, error;
657 
658         scsi_autopm_get_device(sdev);
659         error = -ENODEV;
660         if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
661                 goto fail;
662 
663         error = -ENOMEM;
664         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
665         if (!cd)
666                 goto fail;
667 
668         kref_init(&cd->kref);
669 
670         disk = alloc_disk(1);
671         if (!disk)
672                 goto fail_free;
673 
674         spin_lock(&sr_index_lock);
675         minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
676         if (minor == SR_DISKS) {
677                 spin_unlock(&sr_index_lock);
678                 error = -EBUSY;
679                 goto fail_put;
680         }
681         __set_bit(minor, sr_index_bits);
682         spin_unlock(&sr_index_lock);
683 
684         disk->major = SCSI_CDROM_MAJOR;
685         disk->first_minor = minor;
686         sprintf(disk->disk_name, "sr%d", minor);
687         disk->fops = &sr_bdops;
688         disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
689         disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
690 
691         blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
692 
693         cd->device = sdev;
694         cd->disk = disk;
695         cd->driver = &sr_template;
696         cd->disk = disk;
697         cd->capacity = 0x1fffff;
698         cd->device->changed = 1;        /* force recheck CD type */
699         cd->media_present = 1;
700         cd->use = 1;
701         cd->readcd_known = 0;
702         cd->readcd_cdda = 0;
703 
704         cd->cdi.ops = &sr_dops;
705         cd->cdi.handle = cd;
706         cd->cdi.mask = 0;
707         cd->cdi.capacity = 1;
708         sprintf(cd->cdi.name, "sr%d", minor);
709 
710         sdev->sector_size = 2048;       /* A guess, just in case */
711 
712         /* FIXME: need to handle a get_capabilities failure properly ?? */
713         get_capabilities(cd);
714         sr_vendor_init(cd);
715 
716         set_capacity(disk, cd->capacity);
717         disk->private_data = &cd->driver;
718         disk->queue = sdev->request_queue;
719         cd->cdi.disk = disk;
720 
721         if (register_cdrom(&cd->cdi))
722                 goto fail_put;
723 
724         /*
725          * Initialize block layer runtime PM stuffs before the
726          * periodic event checking request gets started in add_disk.
727          */
728         blk_pm_runtime_init(sdev->request_queue, dev);
729 
730         dev_set_drvdata(dev, cd);
731         disk->flags |= GENHD_FL_REMOVABLE;
732         device_add_disk(&sdev->sdev_gendev, disk);
733 
734         sdev_printk(KERN_DEBUG, sdev,
735                     "Attached scsi CD-ROM %s\n", cd->cdi.name);
736         scsi_autopm_put_device(cd->device);
737 
738         return 0;
739 
740 fail_put:
741         put_disk(disk);
742 fail_free:
743         kfree(cd);
744 fail:
745         scsi_autopm_put_device(sdev);
746         return error;
747 }
748 
749 
750 static void get_sectorsize(struct scsi_cd *cd)
751 {
752         unsigned char cmd[10];
753         unsigned char buffer[8];
754         int the_result, retries = 3;
755         int sector_size;
756         struct request_queue *queue;
757 
758         do {
759                 cmd[0] = READ_CAPACITY;
760                 memset((void *) &cmd[1], 0, 9);
761                 memset(buffer, 0, sizeof(buffer));
762 
763                 /* Do the command and wait.. */
764                 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
765                                               buffer, sizeof(buffer), NULL,
766                                               SR_TIMEOUT, MAX_RETRIES, NULL);
767 
768                 retries--;
769 
770         } while (the_result && retries);
771 
772 
773         if (the_result) {
774                 cd->capacity = 0x1fffff;
775                 sector_size = 2048;     /* A guess, just in case */
776         } else {
777                 long last_written;
778 
779                 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) |
780                                     (buffer[2] << 8) | buffer[3]);
781                 /*
782                  * READ_CAPACITY doesn't return the correct size on
783                  * certain UDF media.  If last_written is larger, use
784                  * it instead.
785                  *
786                  * http://bugzilla.kernel.org/show_bug.cgi?id=9668
787                  */
788                 if (!cdrom_get_last_written(&cd->cdi, &last_written))
789                         cd->capacity = max_t(long, cd->capacity, last_written);
790 
791                 sector_size = (buffer[4] << 24) |
792                     (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
793                 switch (sector_size) {
794                         /*
795                          * HP 4020i CD-Recorder reports 2340 byte sectors
796                          * Philips CD-Writers report 2352 byte sectors
797                          *
798                          * Use 2k sectors for them..
799                          */
800                 case 0:
801                 case 2340:
802                 case 2352:
803                         sector_size = 2048;
804                         /* fall through */
805                 case 2048:
806                         cd->capacity *= 4;
807                         /* fall through */
808                 case 512:
809                         break;
810                 default:
811                         sr_printk(KERN_INFO, cd,
812                                   "unsupported sector size %d.", sector_size);
813                         cd->capacity = 0;
814                 }
815 
816                 cd->device->sector_size = sector_size;
817 
818                 /*
819                  * Add this so that we have the ability to correctly gauge
820                  * what the device is capable of.
821                  */
822                 set_capacity(cd->disk, cd->capacity);
823         }
824 
825         queue = cd->device->request_queue;
826         blk_queue_logical_block_size(queue, sector_size);
827 
828         return;
829 }
830 
831 static void get_capabilities(struct scsi_cd *cd)
832 {
833         unsigned char *buffer;
834         struct scsi_mode_data data;
835         struct scsi_sense_hdr sshdr;
836         int rc, n;
837 
838         static const char *loadmech[] =
839         {
840                 "caddy",
841                 "tray",
842                 "pop-up",
843                 "",
844                 "changer",
845                 "cartridge changer",
846                 "",
847                 ""
848         };
849 
850 
851         /* allocate transfer buffer */
852         buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
853         if (!buffer) {
854                 sr_printk(KERN_ERR, cd, "out of memory.\n");
855                 return;
856         }
857 
858         /* eat unit attentions */
859         scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
860 
861         /* ask for mode page 0x2a */
862         rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
863                              SR_TIMEOUT, 3, &data, NULL);
864 
865         if (!scsi_status_is_good(rc)) {
866                 /* failed, drive doesn't have capabilities mode page */
867                 cd->cdi.speed = 1;
868                 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
869                                  CDC_DVD | CDC_DVD_RAM |
870                                  CDC_SELECT_DISC | CDC_SELECT_SPEED |
871                                  CDC_MRW | CDC_MRW_W | CDC_RAM);
872                 kfree(buffer);
873                 sr_printk(KERN_INFO, cd, "scsi-1 drive");
874                 return;
875         }
876 
877         n = data.header_length + data.block_descriptor_length;
878         cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
879         cd->readcd_known = 1;
880         cd->readcd_cdda = buffer[n + 5] & 0x01;
881         /* print some capability bits */
882         sr_printk(KERN_INFO, cd,
883                   "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",
884                   ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
885                   cd->cdi.speed,
886                   buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
887                   buffer[n + 3] & 0x20 ? "dvd-ram " : "",
888                   buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
889                   buffer[n + 4] & 0x20 ? "xa/form2 " : "",      /* can read xa/from2 */
890                   buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
891                   loadmech[buffer[n + 6] >> 5]);
892         if ((buffer[n + 6] >> 5) == 0)
893                 /* caddy drives can't close tray... */
894                 cd->cdi.mask |= CDC_CLOSE_TRAY;
895         if ((buffer[n + 2] & 0x8) == 0)
896                 /* not a DVD drive */
897                 cd->cdi.mask |= CDC_DVD;
898         if ((buffer[n + 3] & 0x20) == 0)
899                 /* can't write DVD-RAM media */
900                 cd->cdi.mask |= CDC_DVD_RAM;
901         if ((buffer[n + 3] & 0x10) == 0)
902                 /* can't write DVD-R media */
903                 cd->cdi.mask |= CDC_DVD_R;
904         if ((buffer[n + 3] & 0x2) == 0)
905                 /* can't write CD-RW media */
906                 cd->cdi.mask |= CDC_CD_RW;
907         if ((buffer[n + 3] & 0x1) == 0)
908                 /* can't write CD-R media */
909                 cd->cdi.mask |= CDC_CD_R;
910         if ((buffer[n + 6] & 0x8) == 0)
911                 /* can't eject */
912                 cd->cdi.mask |= CDC_OPEN_TRAY;
913 
914         if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
915             (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
916                 cd->cdi.capacity =
917                     cdrom_number_of_slots(&cd->cdi);
918         if (cd->cdi.capacity <= 1)
919                 /* not a changer */
920                 cd->cdi.mask |= CDC_SELECT_DISC;
921         /*else    I don't think it can close its tray
922                 cd->cdi.mask |= CDC_CLOSE_TRAY; */
923 
924         /*
925          * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
926          */
927         if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
928                         (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
929                 cd->writeable = 1;
930         }
931 
932         kfree(buffer);
933 }
934 
935 /*
936  * sr_packet() is the entry point for the generic commands generated
937  * by the Uniform CD-ROM layer.
938  */
939 static int sr_packet(struct cdrom_device_info *cdi,
940                 struct packet_command *cgc)
941 {
942         struct scsi_cd *cd = cdi->handle;
943         struct scsi_device *sdev = cd->device;
944 
945         if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
946                 return -EDRIVE_CANT_DO_THIS;
947 
948         if (cgc->timeout <= 0)
949                 cgc->timeout = IOCTL_TIMEOUT;
950 
951         sr_do_ioctl(cd, cgc);
952 
953         return cgc->stat;
954 }
955 
956 /**
957  *      sr_kref_release - Called to free the scsi_cd structure
958  *      @kref: pointer to embedded kref
959  *
960  *      sr_ref_mutex must be held entering this routine.  Because it is
961  *      called on last put, you should always use the scsi_cd_get()
962  *      scsi_cd_put() helpers which manipulate the semaphore directly
963  *      and never do a direct kref_put().
964  **/
965 static void sr_kref_release(struct kref *kref)
966 {
967         struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
968         struct gendisk *disk = cd->disk;
969 
970         spin_lock(&sr_index_lock);
971         clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
972         spin_unlock(&sr_index_lock);
973 
974         unregister_cdrom(&cd->cdi);
975 
976         disk->private_data = NULL;
977 
978         put_disk(disk);
979 
980         kfree(cd);
981 }
982 
983 static int sr_remove(struct device *dev)
984 {
985         struct scsi_cd *cd = dev_get_drvdata(dev);
986 
987         scsi_autopm_get_device(cd->device);
988 
989         del_gendisk(cd->disk);
990         dev_set_drvdata(dev, NULL);
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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