Line data Source code
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 <asm/uaccess.h>
48 :
49 : #include <scsi/scsi.h>
50 : #include <scsi/scsi_dbg.h>
51 : #include <scsi/scsi_device.h>
52 : #include <scsi/scsi_driver.h>
53 : #include <scsi/scsi_cmnd.h>
54 : #include <scsi/scsi_eh.h>
55 : #include <scsi/scsi_host.h>
56 : #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
57 :
58 : #include "scsi_logging.h"
59 : #include "sr.h"
60 :
61 :
62 : MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
63 : MODULE_LICENSE("GPL");
64 : MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
65 : MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
66 : MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
67 :
68 : #define SR_DISKS 256
69 :
70 : #define SR_CAPABILITIES \
71 : (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
72 : CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
73 : CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
74 : CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
75 : CDC_MRW|CDC_MRW_W|CDC_RAM)
76 :
77 : static int sr_probe(struct device *);
78 : static int sr_remove(struct device *);
79 : static int sr_done(struct scsi_cmnd *);
80 :
81 1 : static struct scsi_driver sr_template = {
82 : .owner = THIS_MODULE,
83 : .gendrv = {
84 : .name = "sr",
85 : .probe = sr_probe,
86 : .remove = sr_remove,
87 : },
88 : .done = sr_done,
89 : };
90 :
91 1 : static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
92 1 : static DEFINE_SPINLOCK(sr_index_lock);
93 :
94 : /* This semaphore is used to mediate the 0->1 reference get in the
95 : * face of object destruction (i.e. we can't allow a get on an
96 : * object after last put) */
97 1 : static DEFINE_MUTEX(sr_ref_mutex);
98 :
99 : static int sr_open(struct cdrom_device_info *, int);
100 : static void sr_release(struct cdrom_device_info *);
101 :
102 : static void get_sectorsize(struct scsi_cd *);
103 : static void get_capabilities(struct scsi_cd *);
104 :
105 : static int sr_media_change(struct cdrom_device_info *, int);
106 : static int sr_packet(struct cdrom_device_info *, struct packet_command *);
107 :
108 1 : static struct cdrom_device_ops sr_dops = {
109 : .open = sr_open,
110 : .release = sr_release,
111 : .drive_status = sr_drive_status,
112 : .media_changed = sr_media_change,
113 : .tray_move = sr_tray_move,
114 : .lock_door = sr_lock_door,
115 : .select_speed = sr_select_speed,
116 : .get_last_session = sr_get_last_session,
117 : .get_mcn = sr_get_mcn,
118 : .reset = sr_reset,
119 : .audio_ioctl = sr_audio_ioctl,
120 : .capability = SR_CAPABILITIES,
121 : .generic_packet = sr_packet,
122 : };
123 :
124 : static void sr_kref_release(struct kref *kref);
125 :
126 : static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
127 : {
128 20 : return container_of(disk->private_data, struct scsi_cd, driver);
129 : }
130 :
131 : /*
132 : * The get and put routines for the struct scsi_cd. Note this entity
133 : * has a scsi_device pointer and owns a reference to this.
134 : */
135 : static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
136 : {
137 2 : struct scsi_cd *cd = NULL;
138 1 :
139 1 : mutex_lock(&sr_ref_mutex);
140 3 : if (disk->private_data == NULL)
141 1 : goto out;
142 2 : cd = scsi_cd(disk);
143 1 : kref_get(&cd->kref);
144 3 : if (scsi_device_get(cd->device))
145 1 : goto out_put;
146 1 : goto out;
147 1 :
148 : out_put:
149 1 : kref_put(&cd->kref, sr_kref_release);
150 1 : cd = NULL;
151 : out:
152 3 : mutex_unlock(&sr_ref_mutex);
153 2 : return cd;
154 : }
155 :
156 : static void scsi_cd_put(struct scsi_cd *cd)
157 : {
158 4 : struct scsi_device *sdev = cd->device;
159 :
160 2 : mutex_lock(&sr_ref_mutex);
161 2 : kref_put(&cd->kref, sr_kref_release);
162 2 : scsi_device_put(sdev);
163 2 : mutex_unlock(&sr_ref_mutex);
164 2 : }
165 :
166 : /* identical to scsi_test_unit_ready except that it doesn't
167 : * eat the NOT_READY returns for removable media */
168 : int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr)
169 : {
170 6 : int retries = MAX_RETRIES;
171 3 : int the_result;
172 21 : u8 cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0 };
173 6 :
174 3 : /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION
175 3 : * conditions are gone, or a timeout happens
176 3 : */
177 : do {
178 9 : the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL,
179 : 0, sshdr, SR_TIMEOUT,
180 : retries--, NULL);
181 21 : if (scsi_sense_valid(sshdr) &&
182 : sshdr->sense_key == UNIT_ATTENTION)
183 3 : sdev->changed = 1;
184 :
185 : } while (retries > 0 &&
186 : (!scsi_status_is_good(the_result) ||
187 : (scsi_sense_valid(sshdr) &&
188 39 : sshdr->sense_key == UNIT_ATTENTION)));
189 6 : return the_result;
190 6 : }
191 :
192 : /*
193 3 : * This function checks to see if the media has been changed in the
194 : * CDROM drive. It is possible that we have already sensed a change,
195 : * or the drive may have sensed one and not yet reported it. We must
196 : * be ready for either case. This function always reports the current
197 : * value of the changed bit. If flag is 0, then the changed bit is reset.
198 : * This function could be done as an ioctl, but we would need to have
199 3 : * an inode for that to work, and we do not always have one.
200 : */
201 :
202 : static int sr_media_change(struct cdrom_device_info *cdi, int slot)
203 : {
204 3 : struct scsi_cd *cd = cdi->handle;
205 1 : int retval;
206 1 : struct scsi_sense_hdr *sshdr;
207 1 :
208 3 : if (CDSL_CURRENT != slot) {
209 : /* no changer support */
210 1 : return -EINVAL;
211 : }
212 :
213 3 : sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
214 3 : retval = sr_test_unit_ready(cd->device, sshdr);
215 9 : if (retval || (scsi_sense_valid(sshdr) &&
216 : /* 0x3a is medium not present */
217 : sshdr->asc == 0x3a)) {
218 : /* Media not present or unable to test, unit probably not
219 : * ready. This usually means there is no disc in the drive.
220 : * Mark as changed, and we will figure it out later once
221 : * the drive is available again.
222 : */
223 2 : cd->device->changed = 1;
224 : /* This will force a flush, if called from check_disk_change */
225 2 : retval = 1;
226 2 : goto out;
227 : };
228 :
229 2 : retval = cd->device->changed;
230 1 : cd->device->changed = 0;
231 : /* If the disk changed, the capacity will now be different,
232 : * so we force a re-read of this information */
233 2 : if (retval) {
234 : /* check multisession offset etc */
235 6 : sr_cd_check(cdi);
236 3 : get_sectorsize(cd);
237 : }
238 :
239 : out:
240 : /* Notify userspace, that media has changed. */
241 11 : if (retval != cd->previous_state)
242 3 : sdev_evt_send_simple(cd->device, SDEV_EVT_MEDIA_CHANGE,
243 : GFP_KERNEL);
244 3 : cd->previous_state = retval;
245 3 : kfree(sshdr);
246 :
247 3 : return retval;
248 : }
249 :
250 : /*
251 : * sr_done is the interrupt routine for the device driver.
252 : *
253 : * It will be notified on the end of a SCSI read / write, and will take one
254 : * of several actions based on success or failure.
255 : */
256 : static int sr_done(struct scsi_cmnd *SCpnt)
257 : {
258 2 : int result = SCpnt->result;
259 4 : int this_count = scsi_bufflen(SCpnt);
260 7 : int good_bytes = (result == 0 ? this_count : 0);
261 2 : int block_sectors = 0;
262 1 : long error_sector;
263 4 : struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
264 1 :
265 1 : #ifdef DEBUG
266 1 : printk("sr.c done: %x\n", result);
267 1 : #endif
268 :
269 : /*
270 : * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
271 : * success. Since this is a relatively rare error condition, no
272 : * care is taken to avoid unnecessary additional work such as
273 : * memcpy's that could be avoided.
274 : */
275 4 : if (driver_byte(result) != 0 && /* An error occurred */
276 : (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
277 : switch (SCpnt->sense_buffer[2]) {
278 3 : case MEDIUM_ERROR:
279 3 : case VOLUME_OVERFLOW:
280 3 : case ILLEGAL_REQUEST:
281 2 : if (!(SCpnt->sense_buffer[0] & 0x90))
282 1 : break;
283 1 : error_sector = (SCpnt->sense_buffer[3] << 24) |
284 : (SCpnt->sense_buffer[4] << 16) |
285 : (SCpnt->sense_buffer[5] << 8) |
286 : SCpnt->sense_buffer[6];
287 3 : if (SCpnt->request->bio != NULL)
288 1 : block_sectors =
289 : bio_sectors(SCpnt->request->bio);
290 2 : if (block_sectors < 4)
291 1 : block_sectors = 4;
292 2 : if (cd->device->sector_size == 2048)
293 1 : error_sector <<= 2;
294 1 : error_sector &= ~(block_sectors - 1);
295 4 : good_bytes = (error_sector -
296 : blk_rq_pos(SCpnt->request)) << 9;
297 4 : if (good_bytes < 0 || good_bytes >= this_count)
298 1 : good_bytes = 0;
299 : /*
300 : * The SCSI specification allows for the value
301 : * returned by READ CAPACITY to be up to 75 2K
302 : * sectors past the last readable block.
303 : * Therefore, if we hit a medium error within the
304 : * last 75 2K sectors, we decrease the saved size
305 : * value.
306 : */
307 7 : if (error_sector < get_capacity(cd->disk) &&
308 : cd->capacity - error_sector < 4 * 75)
309 2 : set_capacity(cd->disk, error_sector);
310 2 : break;
311 1 :
312 3 : case RECOVERED_ERROR:
313 1 : good_bytes = this_count;
314 1 : break;
315 1 :
316 1 : default:
317 2 : break;
318 1 : }
319 1 : }
320 :
321 3 : return good_bytes;
322 : }
323 :
324 : static int sr_prep_fn(struct request_queue *q, struct request *rq)
325 : {
326 0 : int block = 0, this_count, s_size;
327 0 : struct scsi_cd *cd;
328 0 : struct scsi_cmnd *SCpnt;
329 0 : struct scsi_device *sdp = q->queuedata;
330 0 : int ret;
331 0 :
332 0 : if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
333 0 : ret = scsi_setup_blk_pc_cmnd(sdp, rq);
334 0 : goto out;
335 0 : } else if (rq->cmd_type != REQ_TYPE_FS) {
336 0 : ret = BLKPREP_KILL;
337 0 : goto out;
338 0 : }
339 0 : ret = scsi_setup_fs_cmnd(sdp, rq);
340 0 : if (ret != BLKPREP_OK)
341 0 : goto out;
342 0 : SCpnt = rq->special;
343 0 : cd = scsi_cd(rq->rq_disk);
344 0 :
345 0 : /* from here on until we're complete, any goto out
346 0 : * is used for a killable error condition */
347 0 : ret = BLKPREP_KILL;
348 0 :
349 0 : SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n",
350 0 : cd->disk->disk_name, block));
351 0 :
352 0 : if (!cd->device || !scsi_device_online(cd->device)) {
353 0 : SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n",
354 0 : blk_rq_sectors(rq)));
355 0 : SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
356 0 : goto out;
357 0 : }
358 0 :
359 0 : if (cd->device->changed) {
360 0 : /*
361 0 : * quietly refuse to do anything to a changed disc until the
362 : * changed bit has been reset
363 : */
364 0 : goto out;
365 : }
366 :
367 : /*
368 : * we do lazy blocksize switching (when reading XA sectors,
369 : * see CDROMREADMODE2 ioctl)
370 : */
371 0 : s_size = cd->device->sector_size;
372 0 : if (s_size > 2048) {
373 0 : if (!in_interrupt())
374 0 : sr_set_blocklength(cd, 2048);
375 : else
376 0 : printk("sr: can't switch blocksize: in interrupt\n");
377 : }
378 :
379 0 : if (s_size != 512 && s_size != 1024 && s_size != 2048) {
380 0 : scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
381 0 : goto out;
382 : }
383 :
384 0 : if (rq_data_dir(rq) == WRITE) {
385 0 : if (!cd->device->writeable)
386 0 : goto out;
387 0 : SCpnt->cmnd[0] = WRITE_10;
388 0 : SCpnt->sc_data_direction = DMA_TO_DEVICE;
389 0 : cd->cdi.media_written = 1;
390 0 : } else if (rq_data_dir(rq) == READ) {
391 0 : SCpnt->cmnd[0] = READ_10;
392 0 : SCpnt->sc_data_direction = DMA_FROM_DEVICE;
393 : } else {
394 0 : blk_dump_rq_flags(rq, "Unknown sr command");
395 0 : goto out;
396 : }
397 :
398 : {
399 : struct scatterlist *sg;
400 0 : int i, size = 0, sg_count = scsi_sg_count(SCpnt);
401 :
402 0 : scsi_for_each_sg(SCpnt, sg, sg_count, i)
403 0 : size += sg->length;
404 0 :
405 0 : if (size != scsi_bufflen(SCpnt)) {
406 0 : scmd_printk(KERN_ERR, SCpnt,
407 : "mismatch count %d, bytes %d\n",
408 : size, scsi_bufflen(SCpnt));
409 0 : if (scsi_bufflen(SCpnt) > size)
410 0 : SCpnt->sdb.length = size;
411 : }
412 : }
413 :
414 : /*
415 : * request doesn't start on hw block boundary, add scatter pads
416 : */
417 0 : if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
418 0 : (scsi_bufflen(SCpnt) % s_size)) {
419 0 : scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
420 0 : goto out;
421 : }
422 :
423 0 : this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
424 :
425 :
426 : SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n",
427 : cd->cdi.name,
428 : (rq_data_dir(rq) == WRITE) ?
429 : "writing" : "reading",
430 : this_count, blk_rq_sectors(rq)));
431 :
432 0 : SCpnt->cmnd[1] = 0;
433 0 : block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
434 :
435 0 : if (this_count > 0xffff) {
436 0 : this_count = 0xffff;
437 0 : SCpnt->sdb.length = this_count * s_size;
438 : }
439 :
440 0 : SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
441 0 : SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
442 0 : SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
443 0 : SCpnt->cmnd[5] = (unsigned char) block & 0xff;
444 0 : SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
445 0 : SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
446 0 : SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
447 :
448 : /*
449 : * We shouldn't disconnect in the middle of a sector, so with a dumb
450 : * host adapter, it's safe to assume that we can at least transfer
451 : * this many bytes between each connect / disconnect.
452 : */
453 0 : SCpnt->transfersize = cd->device->sector_size;
454 0 : SCpnt->underflow = this_count << 9;
455 0 : SCpnt->allowed = MAX_RETRIES;
456 :
457 : /*
458 : * This indicates that the command is ready from our end to be
459 : * queued.
460 : */
461 0 : ret = BLKPREP_OK;
462 0 : out:
463 0 : return scsi_prep_return(q, rq, ret);
464 : }
465 :
466 : static int sr_block_open(struct block_device *bdev, fmode_t mode)
467 : {
468 5 : struct scsi_cd *cd = scsi_cd_get(bdev->bd_disk);
469 2 : int ret = -ENXIO;
470 1 :
471 2 : if (cd) {
472 1 : ret = cdrom_open(&cd->cdi, bdev, mode);
473 2 : if (ret)
474 2 : scsi_cd_put(cd);
475 : }
476 2 : return ret;
477 : }
478 :
479 : static int sr_block_release(struct gendisk *disk, fmode_t mode)
480 : {
481 4 : struct scsi_cd *cd = scsi_cd(disk);
482 2 : cdrom_release(&cd->cdi, mode);
483 2 : scsi_cd_put(cd);
484 1 : return 0;
485 : }
486 :
487 : static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
488 : unsigned long arg)
489 : {
490 4 : struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
491 2 : struct scsi_device *sdev = cd->device;
492 2 : void __user *argp = (void __user *)arg;
493 1 : int ret;
494 1 :
495 1 : /*
496 1 : * Send SCSI addressing ioctls directly to mid level, send other
497 : * ioctls to cdrom/block level.
498 : */
499 1 : switch (cmd) {
500 4 : case SCSI_IOCTL_GET_IDLUN:
501 4 : case SCSI_IOCTL_GET_BUS_NUMBER:
502 2 : return scsi_ioctl(sdev, cmd, argp);
503 1 : }
504 :
505 1 : ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
506 2 : if (ret != -ENOSYS)
507 1 : return ret;
508 :
509 : /*
510 : * ENODEV means that we didn't recognise the ioctl, or that we
511 : * cannot execute it in the current device state. In either
512 : * case fall through to scsi_ioctl, which will return ENDOEV again
513 : * if it doesn't recognise the ioctl
514 : */
515 1 : ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
516 : (mode & FMODE_NDELAY) != 0);
517 2 : if (ret != -ENODEV)
518 1 : return ret;
519 2 : return scsi_ioctl(sdev, cmd, argp);
520 : }
521 :
522 : static int sr_block_media_changed(struct gendisk *disk)
523 : {
524 4 : struct scsi_cd *cd = scsi_cd(disk);
525 3 : return cdrom_media_changed(&cd->cdi);
526 1 : }
527 :
528 1 : static const struct block_device_operations sr_bdops =
529 : {
530 : .owner = THIS_MODULE,
531 : .open = sr_block_open,
532 : .release = sr_block_release,
533 : .locked_ioctl = sr_block_ioctl,
534 : .media_changed = sr_block_media_changed,
535 : /*
536 : * No compat_ioctl for now because sr_block_ioctl never
537 : * seems to pass arbitary ioctls down to host drivers.
538 : */
539 : };
540 :
541 : static int sr_open(struct cdrom_device_info *cdi, int purpose)
542 : {
543 3 : struct scsi_cd *cd = cdi->handle;
544 2 : struct scsi_device *sdev = cd->device;
545 1 : int retval;
546 1 :
547 : /*
548 : * If the device is in error recovery, wait until it is done.
549 : * If the device is offline, then disallow any access to it.
550 : */
551 1 : retval = -ENXIO;
552 3 : if (!scsi_block_when_processing_errors(sdev))
553 1 : goto error_out;
554 :
555 1 : return 0;
556 1 :
557 : error_out:
558 1 : return retval;
559 : }
560 :
561 : static void sr_release(struct cdrom_device_info *cdi)
562 : {
563 3 : struct scsi_cd *cd = cdi->handle;
564 :
565 2 : if (cd->device->sector_size > 2048)
566 3 : sr_set_blocklength(cd, 2048);
567 2 :
568 : }
569 :
570 : static int sr_probe(struct device *dev)
571 : {
572 3 : struct scsi_device *sdev = to_scsi_device(dev);
573 1 : struct gendisk *disk;
574 1 : struct scsi_cd *cd;
575 1 : int minor, error;
576 1 :
577 2 : error = -ENODEV;
578 4 : if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
579 2 : goto fail;
580 1 :
581 2 : error = -ENOMEM;
582 4 : cd = kzalloc(sizeof(*cd), GFP_KERNEL);
583 2 : if (!cd)
584 1 : goto fail;
585 :
586 1 : kref_init(&cd->kref);
587 :
588 1 : disk = alloc_disk(1);
589 2 : if (!disk)
590 1 : goto fail_free;
591 :
592 2 : spin_lock(&sr_index_lock);
593 2 : minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
594 2 : if (minor == SR_DISKS) {
595 2 : spin_unlock(&sr_index_lock);
596 1 : error = -EBUSY;
597 1 : goto fail_put;
598 : }
599 2 : __set_bit(minor, sr_index_bits);
600 2 : spin_unlock(&sr_index_lock);
601 :
602 1 : disk->major = SCSI_CDROM_MAJOR;
603 1 : disk->first_minor = minor;
604 1 : sprintf(disk->disk_name, "sr%d", minor);
605 1 : disk->fops = &sr_bdops;
606 1 : disk->flags = GENHD_FL_CD;
607 :
608 1 : blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
609 :
610 1 : cd->device = sdev;
611 1 : cd->disk = disk;
612 1 : cd->driver = &sr_template;
613 1 : cd->disk = disk;
614 1 : cd->capacity = 0x1fffff;
615 1 : cd->device->changed = 1; /* force recheck CD type */
616 1 : cd->previous_state = 1;
617 1 : cd->use = 1;
618 1 : cd->readcd_known = 0;
619 1 : cd->readcd_cdda = 0;
620 :
621 1 : cd->cdi.ops = &sr_dops;
622 1 : cd->cdi.handle = cd;
623 1 : cd->cdi.mask = 0;
624 1 : cd->cdi.capacity = 1;
625 1 : sprintf(cd->cdi.name, "sr%d", minor);
626 :
627 1 : sdev->sector_size = 2048; /* A guess, just in case */
628 :
629 : /* FIXME: need to handle a get_capabilities failure properly ?? */
630 3 : get_capabilities(cd);
631 1 : blk_queue_prep_rq(sdev->request_queue, sr_prep_fn);
632 2 : sr_vendor_init(cd);
633 :
634 1 : disk->driverfs_dev = &sdev->sdev_gendev;
635 3 : set_capacity(disk, cd->capacity);
636 1 : disk->private_data = &cd->driver;
637 1 : disk->queue = sdev->request_queue;
638 1 : cd->cdi.disk = disk;
639 :
640 3 : if (register_cdrom(&cd->cdi))
641 1 : goto fail_put;
642 :
643 1 : dev_set_drvdata(dev, cd);
644 1 : disk->flags |= GENHD_FL_REMOVABLE;
645 1 : add_disk(disk);
646 :
647 4 : sdev_printk(KERN_DEBUG, sdev,
648 : "Attached scsi CD-ROM %s\n", cd->cdi.name);
649 1 : return 0;
650 2 :
651 : fail_put:
652 2 : put_disk(disk);
653 : fail_free:
654 5 : kfree(cd);
655 : fail:
656 7 : return error;
657 : }
658 :
659 :
660 : static void get_sectorsize(struct scsi_cd *cd)
661 : {
662 1 : unsigned char cmd[10];
663 1 : unsigned char buffer[8];
664 2 : int the_result, retries = 3;
665 2 : int sector_size;
666 1 : struct request_queue *queue;
667 1 :
668 1 : do {
669 2 : cmd[0] = READ_CAPACITY;
670 2 : memset((void *) &cmd[1], 0, 9);
671 2 : memset(buffer, 0, sizeof(buffer));
672 :
673 : /* Do the command and wait.. */
674 1 : the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
675 : buffer, sizeof(buffer), NULL,
676 : SR_TIMEOUT, MAX_RETRIES, NULL);
677 :
678 1 : retries--;
679 :
680 4 : } while (the_result && retries);
681 :
682 1 :
683 2 : if (the_result) {
684 1 : cd->capacity = 0x1fffff;
685 1 : sector_size = 2048; /* A guess, just in case */
686 : } else {
687 : long last_written;
688 :
689 1 : cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) |
690 : (buffer[2] << 8) | buffer[3]);
691 : /*
692 : * READ_CAPACITY doesn't return the correct size on
693 : * certain UDF media. If last_written is larger, use
694 : * it instead.
695 : *
696 : * http://bugzilla.kernel.org/show_bug.cgi?id=9668
697 : */
698 3 : if (!cdrom_get_last_written(&cd->cdi, &last_written))
699 9 : cd->capacity = max_t(long, cd->capacity, last_written);
700 :
701 1 : sector_size = (buffer[4] << 24) |
702 : (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
703 : switch (sector_size) {
704 : /*
705 : * HP 4020i CD-Recorder reports 2340 byte sectors
706 : * Philips CD-Writers report 2352 byte sectors
707 : *
708 : * Use 2k sectors for them..
709 : */
710 3 : case 0:
711 3 : case 2340:
712 3 : case 2352:
713 1 : sector_size = 2048;
714 1 : /* fall through */
715 3 : case 2048:
716 1 : cd->capacity *= 4;
717 1 : /* fall through */
718 3 : case 512:
719 1 : break;
720 2 : default:
721 2 : printk("%s: unsupported sector size %d.\n",
722 1 : cd->cdi.name, sector_size);
723 2 : cd->capacity = 0;
724 : }
725 1 :
726 1 : cd->device->sector_size = sector_size;
727 1 :
728 : /*
729 : * Add this so that we have the ability to correctly gauge
730 : * what the device is capable of.
731 : */
732 3 : set_capacity(cd->disk, cd->capacity);
733 : }
734 :
735 2 : queue = cd->device->request_queue;
736 2 : blk_queue_logical_block_size(queue, sector_size);
737 :
738 2 : return;
739 : }
740 :
741 : static void get_capabilities(struct scsi_cd *cd)
742 : {
743 1 : unsigned char *buffer;
744 1 : struct scsi_mode_data data;
745 1 : struct scsi_sense_hdr sshdr;
746 1 : int rc, n;
747 1 :
748 9 : static const char *loadmech[] =
749 1 : {
750 1 : "caddy",
751 : "tray",
752 : "pop-up",
753 : "",
754 : "changer",
755 : "cartridge changer",
756 : "",
757 : ""
758 : };
759 :
760 :
761 : /* allocate transfer buffer */
762 3 : buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
763 2 : if (!buffer) {
764 1 : printk(KERN_ERR "sr: out of memory.\n");
765 1 : return;
766 : }
767 :
768 : /* eat unit attentions */
769 3 : sr_test_unit_ready(cd->device, &sshdr);
770 :
771 : /* ask for mode page 0x2a */
772 1 : rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
773 : SR_TIMEOUT, 3, &data, NULL);
774 :
775 4 : if (!scsi_status_is_good(rc)) {
776 : /* failed, drive doesn't have capabilities mode page */
777 1 : cd->cdi.speed = 1;
778 1 : cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
779 : CDC_DVD | CDC_DVD_RAM |
780 : CDC_SELECT_DISC | CDC_SELECT_SPEED |
781 : CDC_MRW | CDC_MRW_W | CDC_RAM);
782 1 : kfree(buffer);
783 1 : printk("%s: scsi-1 drive\n", cd->cdi.name);
784 1 : return;
785 : }
786 :
787 1 : n = data.header_length + data.block_descriptor_length;
788 1 : cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
789 1 : cd->readcd_known = 1;
790 1 : cd->readcd_cdda = buffer[n + 5] & 0x01;
791 : /* print some capability bits */
792 6 : printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name,
793 : ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
794 4 : cd->cdi.speed,
795 4 : buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
796 4 : buffer[n + 3] & 0x20 ? "dvd-ram " : "",
797 4 : buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
798 4 : buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
799 : buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
800 : loadmech[buffer[n + 6] >> 5]);
801 2 : if ((buffer[n + 6] >> 5) == 0)
802 : /* caddy drives can't close tray... */
803 1 : cd->cdi.mask |= CDC_CLOSE_TRAY;
804 2 : if ((buffer[n + 2] & 0x8) == 0)
805 : /* not a DVD drive */
806 1 : cd->cdi.mask |= CDC_DVD;
807 2 : if ((buffer[n + 3] & 0x20) == 0)
808 : /* can't write DVD-RAM media */
809 1 : cd->cdi.mask |= CDC_DVD_RAM;
810 2 : if ((buffer[n + 3] & 0x10) == 0)
811 : /* can't write DVD-R media */
812 1 : cd->cdi.mask |= CDC_DVD_R;
813 2 : if ((buffer[n + 3] & 0x2) == 0)
814 : /* can't write CD-RW media */
815 1 : cd->cdi.mask |= CDC_CD_RW;
816 2 : if ((buffer[n + 3] & 0x1) == 0)
817 : /* can't write CD-R media */
818 1 : cd->cdi.mask |= CDC_CD_R;
819 2 : if ((buffer[n + 6] & 0x8) == 0)
820 : /* can't eject */
821 1 : cd->cdi.mask |= CDC_OPEN_TRAY;
822 :
823 2 : if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
824 : (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
825 1 : cd->cdi.capacity =
826 : cdrom_number_of_slots(&cd->cdi);
827 2 : if (cd->cdi.capacity <= 1)
828 : /* not a changer */
829 1 : cd->cdi.mask |= CDC_SELECT_DISC;
830 : /*else I don't think it can close its tray
831 : cd->cdi.mask |= CDC_CLOSE_TRAY; */
832 :
833 : /*
834 : * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
835 : */
836 2 : if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
837 : (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
838 1 : cd->device->writeable = 1;
839 : }
840 :
841 1 : kfree(buffer);
842 1 : }
843 :
844 : /*
845 : * sr_packet() is the entry point for the generic commands generated
846 : * by the Uniform CD-ROM layer.
847 : */
848 : static int sr_packet(struct cdrom_device_info *cdi,
849 : struct packet_command *cgc)
850 : {
851 2 : if (cgc->timeout <= 0)
852 1 : cgc->timeout = IOCTL_TIMEOUT;
853 :
854 4 : sr_do_ioctl(cdi->handle, cgc);
855 :
856 1 : return cgc->stat;
857 : }
858 :
859 : /**
860 : * sr_kref_release - Called to free the scsi_cd structure
861 : * @kref: pointer to embedded kref
862 : *
863 : * sr_ref_mutex must be held entering this routine. Because it is
864 : * called on last put, you should always use the scsi_cd_get()
865 : * scsi_cd_put() helpers which manipulate the semaphore directly
866 : * and never do a direct kref_put().
867 : **/
868 : static void sr_kref_release(struct kref *kref)
869 : {
870 0 : struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
871 0 : struct gendisk *disk = cd->disk;
872 0 :
873 0 : spin_lock(&sr_index_lock);
874 0 : clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
875 0 : spin_unlock(&sr_index_lock);
876 :
877 0 : unregister_cdrom(&cd->cdi);
878 :
879 0 : disk->private_data = NULL;
880 :
881 0 : put_disk(disk);
882 :
883 0 : kfree(cd);
884 0 : }
885 :
886 : static int sr_remove(struct device *dev)
887 : {
888 4 : struct scsi_cd *cd = dev_get_drvdata(dev);
889 1 :
890 1 : blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn);
891 1 : del_gendisk(cd->disk);
892 :
893 1 : mutex_lock(&sr_ref_mutex);
894 1 : kref_put(&cd->kref, sr_kref_release);
895 1 : mutex_unlock(&sr_ref_mutex);
896 :
897 1 : return 0;
898 : }
899 :
900 : static int __init init_sr(void)
901 : {
902 1 : int rc;
903 :
904 1 : rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
905 2 : if (rc)
906 1 : return rc;
907 2 : rc = scsi_register_driver(&sr_template.gendrv);
908 2 : if (rc)
909 1 : unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
910 :
911 1 : return rc;
912 : }
913 :
914 : static void __exit exit_sr(void)
915 : {
916 4 : scsi_unregister_driver(&sr_template.gendrv);
917 2 : unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
918 2 : }
919 :
920 : module_init(init_sr);
921 : module_exit(exit_sr);
922 1 : MODULE_LICENSE("GPL");
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