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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * sr.c Copyright (C) 1992 David Giller | |
4 | * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale | |
5 | * | |
6 | * adapted from: | |
7 | * sd.c Copyright (C) 1992 Drew Eckhardt | |
8 | * Linux scsi disk driver by | |
9 | * Drew Eckhardt <drew@colorado.edu> | |
10 | * | |
11 | * Modified by Eric Youngdale ericy@andante.org to | |
12 | * add scatter-gather, multiple outstanding request, and other | |
13 | * enhancements. | |
14 | * | |
15 | * Modified by Eric Youngdale eric@andante.org to support loadable | |
16 | * low-level scsi drivers. | |
17 | * | |
18 | * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to | |
19 | * provide auto-eject. | |
20 | * | |
21 | * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the | |
22 | * generic cdrom interface | |
23 | * | |
24 | * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet() | |
25 | * interface, capabilities probe additions, ioctl cleanups, etc. | |
26 | * | |
27 | * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs | |
28 | * | |
29 | * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM | |
30 | * transparently and lose the GHOST hack | |
31 | * | |
32 | * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
33 | * check resource allocation in sr_init and some cleanups | |
34 | */ | |
35 | ||
36 | #include <linux/module.h> | |
37 | #include <linux/fs.h> | |
38 | #include <linux/kernel.h> | |
1da177e4 LT |
39 | #include <linux/mm.h> |
40 | #include <linux/bio.h> | |
d320a955 | 41 | #include <linux/compat.h> |
1da177e4 LT |
42 | #include <linux/string.h> |
43 | #include <linux/errno.h> | |
44 | #include <linux/cdrom.h> | |
45 | #include <linux/interrupt.h> | |
46 | #include <linux/init.h> | |
47 | #include <linux/blkdev.h> | |
bca6b067 | 48 | #include <linux/blk-pm.h> |
0b950672 | 49 | #include <linux/mutex.h> |
5a0e3ad6 | 50 | #include <linux/slab.h> |
6c7f1e2f | 51 | #include <linux/pm_runtime.h> |
7c0f6ba6 | 52 | #include <linux/uaccess.h> |
1da177e4 LT |
53 | |
54 | #include <scsi/scsi.h> | |
55 | #include <scsi/scsi_dbg.h> | |
56 | #include <scsi/scsi_device.h> | |
57 | #include <scsi/scsi_driver.h> | |
820732b5 | 58 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
59 | #include <scsi/scsi_eh.h> |
60 | #include <scsi/scsi_host.h> | |
61 | #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ | |
1da177e4 LT |
62 | |
63 | #include "scsi_logging.h" | |
64 | #include "sr.h" | |
65 | ||
66 | ||
f018fa55 RH |
67 | MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); |
68 | MODULE_LICENSE("GPL"); | |
69 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); | |
d7b8bcb0 MT |
70 | MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); |
71 | MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); | |
f018fa55 | 72 | |
1da177e4 LT |
73 | #define SR_DISKS 256 |
74 | ||
1da177e4 LT |
75 | #define SR_CAPABILITIES \ |
76 | (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ | |
77 | CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ | |
6a2900b6 | 78 | CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ |
1da177e4 LT |
79 | CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ |
80 | CDC_MRW|CDC_MRW_W|CDC_RAM) | |
81 | ||
2a48fc0a | 82 | static DEFINE_MUTEX(sr_mutex); |
1da177e4 LT |
83 | static int sr_probe(struct device *); |
84 | static int sr_remove(struct device *); | |
159b2cbf | 85 | static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt); |
7b3d9545 | 86 | static int sr_done(struct scsi_cmnd *); |
6c7f1e2f AL |
87 | static int sr_runtime_suspend(struct device *dev); |
88 | ||
a816b4c6 | 89 | static const struct dev_pm_ops sr_pm_ops = { |
6c7f1e2f AL |
90 | .runtime_suspend = sr_runtime_suspend, |
91 | }; | |
1da177e4 LT |
92 | |
93 | static struct scsi_driver sr_template = { | |
1da177e4 LT |
94 | .gendrv = { |
95 | .name = "sr", | |
3af6b352 | 96 | .owner = THIS_MODULE, |
1da177e4 LT |
97 | .probe = sr_probe, |
98 | .remove = sr_remove, | |
6c7f1e2f | 99 | .pm = &sr_pm_ops, |
1da177e4 | 100 | }, |
a1b73fc1 | 101 | .init_command = sr_init_command, |
7b3d9545 | 102 | .done = sr_done, |
1da177e4 LT |
103 | }; |
104 | ||
105 | static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; | |
106 | static DEFINE_SPINLOCK(sr_index_lock); | |
107 | ||
108 | /* This semaphore is used to mediate the 0->1 reference get in the | |
109 | * face of object destruction (i.e. we can't allow a get on an | |
110 | * object after last put) */ | |
0b950672 | 111 | static DEFINE_MUTEX(sr_ref_mutex); |
1da177e4 LT |
112 | |
113 | static int sr_open(struct cdrom_device_info *, int); | |
114 | static void sr_release(struct cdrom_device_info *); | |
115 | ||
116 | static void get_sectorsize(struct scsi_cd *); | |
117 | static void get_capabilities(struct scsi_cd *); | |
118 | ||
93aae17a TH |
119 | static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
120 | unsigned int clearing, int slot); | |
1da177e4 LT |
121 | static int sr_packet(struct cdrom_device_info *, struct packet_command *); |
122 | ||
853fe1bf | 123 | static const struct cdrom_device_ops sr_dops = { |
1da177e4 LT |
124 | .open = sr_open, |
125 | .release = sr_release, | |
126 | .drive_status = sr_drive_status, | |
93aae17a | 127 | .check_events = sr_check_events, |
1da177e4 LT |
128 | .tray_move = sr_tray_move, |
129 | .lock_door = sr_lock_door, | |
130 | .select_speed = sr_select_speed, | |
131 | .get_last_session = sr_get_last_session, | |
132 | .get_mcn = sr_get_mcn, | |
133 | .reset = sr_reset, | |
134 | .audio_ioctl = sr_audio_ioctl, | |
1da177e4 LT |
135 | .capability = SR_CAPABILITIES, |
136 | .generic_packet = sr_packet, | |
137 | }; | |
138 | ||
139 | static void sr_kref_release(struct kref *kref); | |
140 | ||
141 | static inline struct scsi_cd *scsi_cd(struct gendisk *disk) | |
142 | { | |
143 | return container_of(disk->private_data, struct scsi_cd, driver); | |
144 | } | |
145 | ||
6c7f1e2f AL |
146 | static int sr_runtime_suspend(struct device *dev) |
147 | { | |
148 | struct scsi_cd *cd = dev_get_drvdata(dev); | |
149 | ||
13b43891 AS |
150 | if (!cd) /* E.g.: runtime suspend following sr_remove() */ |
151 | return 0; | |
152 | ||
6c7f1e2f AL |
153 | if (cd->media_present) |
154 | return -EBUSY; | |
155 | else | |
156 | return 0; | |
157 | } | |
158 | ||
1da177e4 LT |
159 | /* |
160 | * The get and put routines for the struct scsi_cd. Note this entity | |
161 | * has a scsi_device pointer and owns a reference to this. | |
162 | */ | |
163 | static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) | |
164 | { | |
165 | struct scsi_cd *cd = NULL; | |
166 | ||
0b950672 | 167 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
168 | if (disk->private_data == NULL) |
169 | goto out; | |
170 | cd = scsi_cd(disk); | |
171 | kref_get(&cd->kref); | |
6627b38f AL |
172 | if (scsi_device_get(cd->device)) { |
173 | kref_put(&cd->kref, sr_kref_release); | |
174 | cd = NULL; | |
175 | } | |
1da177e4 | 176 | out: |
0b950672 | 177 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
178 | return cd; |
179 | } | |
180 | ||
858119e1 | 181 | static void scsi_cd_put(struct scsi_cd *cd) |
1da177e4 LT |
182 | { |
183 | struct scsi_device *sdev = cd->device; | |
184 | ||
0b950672 | 185 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
186 | kref_put(&cd->kref, sr_kref_release); |
187 | scsi_device_put(sdev); | |
0b950672 | 188 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
189 | } |
190 | ||
93aae17a TH |
191 | static unsigned int sr_get_events(struct scsi_device *sdev) |
192 | { | |
193 | u8 buf[8]; | |
194 | u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, | |
195 | 1, /* polled */ | |
196 | 0, 0, /* reserved */ | |
197 | 1 << 4, /* notification class: media */ | |
198 | 0, 0, /* reserved */ | |
199 | 0, sizeof(buf), /* allocation length */ | |
200 | 0, /* control */ | |
201 | }; | |
202 | struct event_header *eh = (void *)buf; | |
203 | struct media_event_desc *med = (void *)(buf + 4); | |
204 | struct scsi_sense_hdr sshdr; | |
205 | int result; | |
206 | ||
207 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), | |
208 | &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); | |
209 | if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) | |
210 | return DISK_EVENT_MEDIA_CHANGE; | |
211 | ||
212 | if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) | |
213 | return 0; | |
214 | ||
215 | if (eh->nea || eh->notification_class != 0x4) | |
216 | return 0; | |
217 | ||
218 | if (med->media_event_code == 1) | |
219 | return DISK_EVENT_EJECT_REQUEST; | |
220 | else if (med->media_event_code == 2) | |
221 | return DISK_EVENT_MEDIA_CHANGE; | |
222 | return 0; | |
223 | } | |
224 | ||
1da177e4 | 225 | /* |
93aae17a TH |
226 | * This function checks to see if the media has been changed or eject |
227 | * button has been pressed. It is possible that we have already | |
228 | * sensed a change, or the drive may have sensed one and not yet | |
229 | * reported it. The past events are accumulated in sdev->changed and | |
230 | * returned together with the current state. | |
1da177e4 | 231 | */ |
93aae17a TH |
232 | static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
233 | unsigned int clearing, int slot) | |
1da177e4 LT |
234 | { |
235 | struct scsi_cd *cd = cdi->handle; | |
93aae17a TH |
236 | bool last_present; |
237 | struct scsi_sense_hdr sshdr; | |
238 | unsigned int events; | |
239 | int ret; | |
1da177e4 | 240 | |
93aae17a TH |
241 | /* no changer support */ |
242 | if (CDSL_CURRENT != slot) | |
243 | return 0; | |
244 | ||
245 | events = sr_get_events(cd->device); | |
79b9677d KS |
246 | cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; |
247 | ||
248 | /* | |
249 | * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree | |
250 | * for several times in a row. We rely on TUR only for this likely | |
251 | * broken device, to prevent generating incorrect media changed | |
252 | * events for every open(). | |
253 | */ | |
254 | if (cd->ignore_get_event) { | |
255 | events &= ~DISK_EVENT_MEDIA_CHANGE; | |
256 | goto do_tur; | |
257 | } | |
258 | ||
93aae17a TH |
259 | /* |
260 | * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE | |
261 | * is being cleared. Note that there are devices which hang | |
262 | * if asked to execute TUR repeatedly. | |
263 | */ | |
79b9677d KS |
264 | if (cd->device->changed) { |
265 | events |= DISK_EVENT_MEDIA_CHANGE; | |
266 | cd->device->changed = 0; | |
267 | cd->tur_changed = true; | |
268 | } | |
93aae17a | 269 | |
79b9677d KS |
270 | if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) |
271 | return events; | |
272 | do_tur: | |
93aae17a TH |
273 | /* let's see whether the media is there with TUR */ |
274 | last_present = cd->media_present; | |
275 | ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); | |
1da177e4 | 276 | |
638428ec TH |
277 | /* |
278 | * Media is considered to be present if TUR succeeds or fails with | |
279 | * sense data indicating something other than media-not-present | |
280 | * (ASC 0x3a). | |
281 | */ | |
93aae17a TH |
282 | cd->media_present = scsi_status_is_good(ret) || |
283 | (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); | |
1da177e4 | 284 | |
93aae17a | 285 | if (last_present != cd->media_present) |
79b9677d KS |
286 | cd->device->changed = 1; |
287 | ||
93aae17a TH |
288 | if (cd->device->changed) { |
289 | events |= DISK_EVENT_MEDIA_CHANGE; | |
290 | cd->device->changed = 0; | |
79b9677d KS |
291 | cd->tur_changed = true; |
292 | } | |
293 | ||
294 | if (cd->ignore_get_event) | |
295 | return events; | |
296 | ||
297 | /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ | |
298 | if (!cd->tur_changed) { | |
299 | if (cd->get_event_changed) { | |
300 | if (cd->tur_mismatch++ > 8) { | |
96eefad2 HR |
301 | sr_printk(KERN_WARNING, cd, |
302 | "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); | |
79b9677d KS |
303 | cd->ignore_get_event = true; |
304 | } | |
305 | } else { | |
306 | cd->tur_mismatch = 0; | |
307 | } | |
1da177e4 | 308 | } |
79b9677d KS |
309 | cd->tur_changed = false; |
310 | cd->get_event_changed = false; | |
285e9670 | 311 | |
93aae17a | 312 | return events; |
1da177e4 | 313 | } |
93aae17a | 314 | |
1da177e4 | 315 | /* |
7b3d9545 | 316 | * sr_done is the interrupt routine for the device driver. |
1da177e4 | 317 | * |
7b3d9545 | 318 | * It will be notified on the end of a SCSI read / write, and will take one |
1da177e4 LT |
319 | * of several actions based on success or failure. |
320 | */ | |
7b3d9545 | 321 | static int sr_done(struct scsi_cmnd *SCpnt) |
1da177e4 LT |
322 | { |
323 | int result = SCpnt->result; | |
30b0c37b | 324 | int this_count = scsi_bufflen(SCpnt); |
1da177e4 LT |
325 | int good_bytes = (result == 0 ? this_count : 0); |
326 | int block_sectors = 0; | |
327 | long error_sector; | |
328 | struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); | |
329 | ||
330 | #ifdef DEBUG | |
96eefad2 | 331 | scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); |
1da177e4 LT |
332 | #endif |
333 | ||
334 | /* | |
335 | * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial | |
336 | * success. Since this is a relatively rare error condition, no | |
337 | * care is taken to avoid unnecessary additional work such as | |
338 | * memcpy's that could be avoided. | |
339 | */ | |
340 | if (driver_byte(result) != 0 && /* An error occurred */ | |
341 | (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ | |
342 | switch (SCpnt->sense_buffer[2]) { | |
343 | case MEDIUM_ERROR: | |
344 | case VOLUME_OVERFLOW: | |
345 | case ILLEGAL_REQUEST: | |
346 | if (!(SCpnt->sense_buffer[0] & 0x90)) | |
347 | break; | |
1da177e4 LT |
348 | error_sector = (SCpnt->sense_buffer[3] << 24) | |
349 | (SCpnt->sense_buffer[4] << 16) | | |
350 | (SCpnt->sense_buffer[5] << 8) | | |
351 | SCpnt->sense_buffer[6]; | |
352 | if (SCpnt->request->bio != NULL) | |
353 | block_sectors = | |
354 | bio_sectors(SCpnt->request->bio); | |
355 | if (block_sectors < 4) | |
356 | block_sectors = 4; | |
357 | if (cd->device->sector_size == 2048) | |
358 | error_sector <<= 2; | |
359 | error_sector &= ~(block_sectors - 1); | |
83096ebf TH |
360 | good_bytes = (error_sector - |
361 | blk_rq_pos(SCpnt->request)) << 9; | |
1da177e4 LT |
362 | if (good_bytes < 0 || good_bytes >= this_count) |
363 | good_bytes = 0; | |
364 | /* | |
365 | * The SCSI specification allows for the value | |
366 | * returned by READ CAPACITY to be up to 75 2K | |
367 | * sectors past the last readable block. | |
368 | * Therefore, if we hit a medium error within the | |
369 | * last 75 2K sectors, we decrease the saved size | |
370 | * value. | |
371 | */ | |
372 | if (error_sector < get_capacity(cd->disk) && | |
373 | cd->capacity - error_sector < 4 * 75) | |
374 | set_capacity(cd->disk, error_sector); | |
375 | break; | |
376 | ||
377 | case RECOVERED_ERROR: | |
1da177e4 LT |
378 | good_bytes = this_count; |
379 | break; | |
380 | ||
381 | default: | |
382 | break; | |
383 | } | |
384 | } | |
385 | ||
7b3d9545 | 386 | return good_bytes; |
1da177e4 LT |
387 | } |
388 | ||
159b2cbf | 389 | static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) |
1da177e4 | 390 | { |
242f9dcb | 391 | int block = 0, this_count, s_size; |
7f9a6bc4 | 392 | struct scsi_cd *cd; |
a1b73fc1 | 393 | struct request *rq = SCpnt->request; |
159b2cbf | 394 | blk_status_t ret; |
7f9a6bc4 | 395 | |
3c356bde | 396 | ret = scsi_init_io(SCpnt); |
159b2cbf | 397 | if (ret != BLK_STS_OK) |
7f9a6bc4 | 398 | goto out; |
7f9a6bc4 JB |
399 | cd = scsi_cd(rq->rq_disk); |
400 | ||
401 | /* from here on until we're complete, any goto out | |
402 | * is used for a killable error condition */ | |
159b2cbf | 403 | ret = BLK_STS_IOERR; |
1da177e4 | 404 | |
96eefad2 HR |
405 | SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, |
406 | "Doing sr request, block = %d\n", block)); | |
1da177e4 LT |
407 | |
408 | if (!cd->device || !scsi_device_online(cd->device)) { | |
96eefad2 HR |
409 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
410 | "Finishing %u sectors\n", blk_rq_sectors(rq))); | |
411 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, | |
412 | "Retry with 0x%p\n", SCpnt)); | |
7f9a6bc4 | 413 | goto out; |
1da177e4 LT |
414 | } |
415 | ||
416 | if (cd->device->changed) { | |
417 | /* | |
418 | * quietly refuse to do anything to a changed disc until the | |
419 | * changed bit has been reset | |
420 | */ | |
7f9a6bc4 | 421 | goto out; |
1da177e4 LT |
422 | } |
423 | ||
1da177e4 LT |
424 | /* |
425 | * we do lazy blocksize switching (when reading XA sectors, | |
426 | * see CDROMREADMODE2 ioctl) | |
427 | */ | |
428 | s_size = cd->device->sector_size; | |
429 | if (s_size > 2048) { | |
430 | if (!in_interrupt()) | |
431 | sr_set_blocklength(cd, 2048); | |
432 | else | |
96eefad2 HR |
433 | scmd_printk(KERN_INFO, SCpnt, |
434 | "can't switch blocksize: in interrupt\n"); | |
1da177e4 LT |
435 | } |
436 | ||
437 | if (s_size != 512 && s_size != 1024 && s_size != 2048) { | |
3bf743e7 | 438 | scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); |
7f9a6bc4 | 439 | goto out; |
1da177e4 LT |
440 | } |
441 | ||
aebf526b CH |
442 | switch (req_op(rq)) { |
443 | case REQ_OP_WRITE: | |
fd2eb903 | 444 | if (!cd->writeable) |
7f9a6bc4 | 445 | goto out; |
1da177e4 | 446 | SCpnt->cmnd[0] = WRITE_10; |
96eefad2 | 447 | cd->cdi.media_written = 1; |
aebf526b CH |
448 | break; |
449 | case REQ_OP_READ: | |
1da177e4 | 450 | SCpnt->cmnd[0] = READ_10; |
aebf526b CH |
451 | break; |
452 | default: | |
7f9a6bc4 JB |
453 | blk_dump_rq_flags(rq, "Unknown sr command"); |
454 | goto out; | |
1da177e4 LT |
455 | } |
456 | ||
457 | { | |
30b0c37b BH |
458 | struct scatterlist *sg; |
459 | int i, size = 0, sg_count = scsi_sg_count(SCpnt); | |
1da177e4 | 460 | |
30b0c37b BH |
461 | scsi_for_each_sg(SCpnt, sg, sg_count, i) |
462 | size += sg->length; | |
463 | ||
464 | if (size != scsi_bufflen(SCpnt)) { | |
3bf743e7 JG |
465 | scmd_printk(KERN_ERR, SCpnt, |
466 | "mismatch count %d, bytes %d\n", | |
30b0c37b BH |
467 | size, scsi_bufflen(SCpnt)); |
468 | if (scsi_bufflen(SCpnt) > size) | |
469 | SCpnt->sdb.length = size; | |
1da177e4 LT |
470 | } |
471 | } | |
472 | ||
473 | /* | |
474 | * request doesn't start on hw block boundary, add scatter pads | |
475 | */ | |
83096ebf | 476 | if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || |
30b0c37b | 477 | (scsi_bufflen(SCpnt) % s_size)) { |
3bf743e7 | 478 | scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); |
7f9a6bc4 | 479 | goto out; |
1da177e4 LT |
480 | } |
481 | ||
30b0c37b | 482 | this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); |
1da177e4 LT |
483 | |
484 | ||
96eefad2 HR |
485 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
486 | "%s %d/%u 512 byte blocks.\n", | |
487 | (rq_data_dir(rq) == WRITE) ? | |
1da177e4 | 488 | "writing" : "reading", |
96eefad2 | 489 | this_count, blk_rq_sectors(rq))); |
1da177e4 LT |
490 | |
491 | SCpnt->cmnd[1] = 0; | |
83096ebf | 492 | block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); |
1da177e4 LT |
493 | |
494 | if (this_count > 0xffff) { | |
495 | this_count = 0xffff; | |
30b0c37b | 496 | SCpnt->sdb.length = this_count * s_size; |
1da177e4 LT |
497 | } |
498 | ||
499 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; | |
500 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
501 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
502 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
503 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
504 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
505 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
506 | ||
507 | /* | |
508 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
509 | * host adapter, it's safe to assume that we can at least transfer | |
510 | * this many bytes between each connect / disconnect. | |
511 | */ | |
512 | SCpnt->transfersize = cd->device->sector_size; | |
513 | SCpnt->underflow = this_count << 9; | |
1da177e4 | 514 | SCpnt->allowed = MAX_RETRIES; |
1da177e4 | 515 | |
1da177e4 LT |
516 | /* |
517 | * This indicates that the command is ready from our end to be | |
518 | * queued. | |
519 | */ | |
159b2cbf | 520 | ret = BLK_STS_OK; |
7f9a6bc4 | 521 | out: |
a1b73fc1 | 522 | return ret; |
1da177e4 LT |
523 | } |
524 | ||
40cc51be | 525 | static int sr_block_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 526 | { |
6e9624b8 | 527 | struct scsi_cd *cd; |
1214fd7b | 528 | struct scsi_device *sdev; |
40cc51be | 529 | int ret = -ENXIO; |
1da177e4 | 530 | |
1214fd7b BVA |
531 | cd = scsi_cd_get(bdev->bd_disk); |
532 | if (!cd) | |
533 | goto out; | |
534 | ||
535 | sdev = cd->device; | |
536 | scsi_autopm_get_device(sdev); | |
2bbea6e1 ML |
537 | check_disk_change(bdev); |
538 | ||
2a48fc0a | 539 | mutex_lock(&sr_mutex); |
1214fd7b | 540 | ret = cdrom_open(&cd->cdi, bdev, mode); |
2a48fc0a | 541 | mutex_unlock(&sr_mutex); |
1214fd7b BVA |
542 | |
543 | scsi_autopm_put_device(sdev); | |
544 | if (ret) | |
545 | scsi_cd_put(cd); | |
546 | ||
547 | out: | |
1da177e4 LT |
548 | return ret; |
549 | } | |
550 | ||
db2a144b | 551 | static void sr_block_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 552 | { |
40cc51be | 553 | struct scsi_cd *cd = scsi_cd(disk); |
2a48fc0a | 554 | mutex_lock(&sr_mutex); |
40cc51be | 555 | cdrom_release(&cd->cdi, mode); |
1da177e4 | 556 | scsi_cd_put(cd); |
2a48fc0a | 557 | mutex_unlock(&sr_mutex); |
1da177e4 LT |
558 | } |
559 | ||
40cc51be | 560 | static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, |
1da177e4 LT |
561 | unsigned long arg) |
562 | { | |
40cc51be | 563 | struct scsi_cd *cd = scsi_cd(bdev->bd_disk); |
1da177e4 | 564 | struct scsi_device *sdev = cd->device; |
6a2900b6 CH |
565 | void __user *argp = (void __user *)arg; |
566 | int ret; | |
1da177e4 | 567 | |
2a48fc0a | 568 | mutex_lock(&sr_mutex); |
8a6cfeb6 | 569 | |
906d15fb CH |
570 | ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, |
571 | (mode & FMODE_NDELAY) != 0); | |
572 | if (ret) | |
573 | goto out; | |
574 | ||
1214fd7b BVA |
575 | scsi_autopm_get_device(sdev); |
576 | ||
6a2900b6 CH |
577 | /* |
578 | * Send SCSI addressing ioctls directly to mid level, send other | |
579 | * ioctls to cdrom/block level. | |
580 | */ | |
581 | switch (cmd) { | |
582 | case SCSI_IOCTL_GET_IDLUN: | |
583 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
8a6cfeb6 | 584 | ret = scsi_ioctl(sdev, cmd, argp); |
1214fd7b | 585 | goto put; |
1da177e4 | 586 | } |
6a2900b6 | 587 | |
40cc51be | 588 | ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); |
6397256b | 589 | if (ret != -ENOSYS) |
1214fd7b | 590 | goto put; |
6a2900b6 | 591 | |
8a6cfeb6 AB |
592 | ret = scsi_ioctl(sdev, cmd, argp); |
593 | ||
1214fd7b BVA |
594 | put: |
595 | scsi_autopm_put_device(sdev); | |
596 | ||
8a6cfeb6 | 597 | out: |
2a48fc0a | 598 | mutex_unlock(&sr_mutex); |
8a6cfeb6 | 599 | return ret; |
1da177e4 LT |
600 | } |
601 | ||
d320a955 AB |
602 | #ifdef CONFIG_COMPAT |
603 | static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, | |
604 | unsigned long arg) | |
605 | { | |
606 | struct scsi_cd *cd = scsi_cd(bdev->bd_disk); | |
607 | struct scsi_device *sdev = cd->device; | |
608 | void __user *argp = compat_ptr(arg); | |
609 | int ret; | |
610 | ||
611 | mutex_lock(&sr_mutex); | |
612 | ||
613 | ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, | |
614 | (mode & FMODE_NDELAY) != 0); | |
615 | if (ret) | |
616 | goto out; | |
617 | ||
618 | scsi_autopm_get_device(sdev); | |
619 | ||
620 | /* | |
621 | * Send SCSI addressing ioctls directly to mid level, send other | |
622 | * ioctls to cdrom/block level. | |
623 | */ | |
624 | switch (cmd) { | |
625 | case SCSI_IOCTL_GET_IDLUN: | |
626 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
627 | ret = scsi_compat_ioctl(sdev, cmd, argp); | |
628 | goto put; | |
629 | } | |
630 | ||
64cbfa96 AB |
631 | ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, (unsigned long)argp); |
632 | if (ret != -ENOSYS) | |
d320a955 AB |
633 | goto put; |
634 | ||
635 | ret = scsi_compat_ioctl(sdev, cmd, argp); | |
636 | ||
637 | put: | |
638 | scsi_autopm_put_device(sdev); | |
639 | ||
640 | out: | |
641 | mutex_unlock(&sr_mutex); | |
642 | return ret; | |
643 | ||
644 | } | |
645 | #endif | |
646 | ||
93aae17a TH |
647 | static unsigned int sr_block_check_events(struct gendisk *disk, |
648 | unsigned int clearing) | |
1da177e4 | 649 | { |
2d097c50 JA |
650 | unsigned int ret = 0; |
651 | struct scsi_cd *cd; | |
6c7f1e2f | 652 | |
2d097c50 JA |
653 | cd = scsi_cd_get(disk); |
654 | if (!cd) | |
6627b38f | 655 | return 0; |
6c7f1e2f | 656 | |
2d097c50 JA |
657 | if (!atomic_read(&cd->device->disk_events_disable_depth)) |
658 | ret = cdrom_check_events(&cd->cdi, clearing); | |
659 | ||
660 | scsi_cd_put(cd); | |
661 | return ret; | |
93aae17a TH |
662 | } |
663 | ||
664 | static int sr_block_revalidate_disk(struct gendisk *disk) | |
665 | { | |
93aae17a | 666 | struct scsi_sense_hdr sshdr; |
2d097c50 JA |
667 | struct scsi_cd *cd; |
668 | ||
669 | cd = scsi_cd_get(disk); | |
670 | if (!cd) | |
671 | return -ENXIO; | |
93aae17a TH |
672 | |
673 | /* if the unit is not ready, nothing more to do */ | |
674 | if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) | |
6c7f1e2f | 675 | goto out; |
93aae17a TH |
676 | |
677 | sr_cd_check(&cd->cdi); | |
678 | get_sectorsize(cd); | |
6c7f1e2f | 679 | out: |
2d097c50 | 680 | scsi_cd_put(cd); |
93aae17a | 681 | return 0; |
1da177e4 LT |
682 | } |
683 | ||
83d5cde4 | 684 | static const struct block_device_operations sr_bdops = |
1da177e4 LT |
685 | { |
686 | .owner = THIS_MODULE, | |
40cc51be AV |
687 | .open = sr_block_open, |
688 | .release = sr_block_release, | |
8a6cfeb6 | 689 | .ioctl = sr_block_ioctl, |
d320a955 | 690 | #ifdef CONFIG_COMPAT |
03264ddd | 691 | .compat_ioctl = sr_block_compat_ioctl, |
d320a955 | 692 | #endif |
93aae17a TH |
693 | .check_events = sr_block_check_events, |
694 | .revalidate_disk = sr_block_revalidate_disk, | |
1da177e4 LT |
695 | }; |
696 | ||
697 | static int sr_open(struct cdrom_device_info *cdi, int purpose) | |
698 | { | |
699 | struct scsi_cd *cd = cdi->handle; | |
700 | struct scsi_device *sdev = cd->device; | |
701 | int retval; | |
702 | ||
703 | /* | |
704 | * If the device is in error recovery, wait until it is done. | |
705 | * If the device is offline, then disallow any access to it. | |
706 | */ | |
707 | retval = -ENXIO; | |
708 | if (!scsi_block_when_processing_errors(sdev)) | |
709 | goto error_out; | |
710 | ||
1da177e4 LT |
711 | return 0; |
712 | ||
713 | error_out: | |
714 | return retval; | |
715 | } | |
716 | ||
717 | static void sr_release(struct cdrom_device_info *cdi) | |
718 | { | |
719 | struct scsi_cd *cd = cdi->handle; | |
720 | ||
721 | if (cd->device->sector_size > 2048) | |
722 | sr_set_blocklength(cd, 2048); | |
723 | ||
724 | } | |
725 | ||
726 | static int sr_probe(struct device *dev) | |
727 | { | |
728 | struct scsi_device *sdev = to_scsi_device(dev); | |
729 | struct gendisk *disk; | |
730 | struct scsi_cd *cd; | |
731 | int minor, error; | |
732 | ||
6fe8c1db | 733 | scsi_autopm_get_device(sdev); |
1da177e4 LT |
734 | error = -ENODEV; |
735 | if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) | |
736 | goto fail; | |
737 | ||
738 | error = -ENOMEM; | |
24669f75 | 739 | cd = kzalloc(sizeof(*cd), GFP_KERNEL); |
1da177e4 LT |
740 | if (!cd) |
741 | goto fail; | |
1da177e4 LT |
742 | |
743 | kref_init(&cd->kref); | |
744 | ||
745 | disk = alloc_disk(1); | |
746 | if (!disk) | |
747 | goto fail_free; | |
748 | ||
749 | spin_lock(&sr_index_lock); | |
750 | minor = find_first_zero_bit(sr_index_bits, SR_DISKS); | |
751 | if (minor == SR_DISKS) { | |
752 | spin_unlock(&sr_index_lock); | |
753 | error = -EBUSY; | |
754 | goto fail_put; | |
755 | } | |
756 | __set_bit(minor, sr_index_bits); | |
757 | spin_unlock(&sr_index_lock); | |
758 | ||
759 | disk->major = SCSI_CDROM_MAJOR; | |
760 | disk->first_minor = minor; | |
761 | sprintf(disk->disk_name, "sr%d", minor); | |
762 | disk->fops = &sr_bdops; | |
d4dc210f | 763 | disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; |
93aae17a | 764 | disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; |
c92e2f04 | 765 | disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; |
1da177e4 | 766 | |
242f9dcb JA |
767 | blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); |
768 | ||
1da177e4 LT |
769 | cd->device = sdev; |
770 | cd->disk = disk; | |
771 | cd->driver = &sr_template; | |
772 | cd->disk = disk; | |
773 | cd->capacity = 0x1fffff; | |
1da177e4 | 774 | cd->device->changed = 1; /* force recheck CD type */ |
93aae17a | 775 | cd->media_present = 1; |
1da177e4 LT |
776 | cd->use = 1; |
777 | cd->readcd_known = 0; | |
778 | cd->readcd_cdda = 0; | |
779 | ||
780 | cd->cdi.ops = &sr_dops; | |
781 | cd->cdi.handle = cd; | |
782 | cd->cdi.mask = 0; | |
783 | cd->cdi.capacity = 1; | |
784 | sprintf(cd->cdi.name, "sr%d", minor); | |
785 | ||
786 | sdev->sector_size = 2048; /* A guess, just in case */ | |
787 | ||
788 | /* FIXME: need to handle a get_capabilities failure properly ?? */ | |
789 | get_capabilities(cd); | |
790 | sr_vendor_init(cd); | |
791 | ||
1da177e4 LT |
792 | set_capacity(disk, cd->capacity); |
793 | disk->private_data = &cd->driver; | |
794 | disk->queue = sdev->request_queue; | |
795 | cd->cdi.disk = disk; | |
796 | ||
797 | if (register_cdrom(&cd->cdi)) | |
798 | goto fail_put; | |
799 | ||
6627b38f AL |
800 | /* |
801 | * Initialize block layer runtime PM stuffs before the | |
802 | * periodic event checking request gets started in add_disk. | |
803 | */ | |
804 | blk_pm_runtime_init(sdev->request_queue, dev); | |
805 | ||
1da177e4 LT |
806 | dev_set_drvdata(dev, cd); |
807 | disk->flags |= GENHD_FL_REMOVABLE; | |
fef912bf | 808 | device_add_disk(&sdev->sdev_gendev, disk, NULL); |
1da177e4 | 809 | |
9ccfc756 JB |
810 | sdev_printk(KERN_DEBUG, sdev, |
811 | "Attached scsi CD-ROM %s\n", cd->cdi.name); | |
6c7f1e2f AL |
812 | scsi_autopm_put_device(cd->device); |
813 | ||
1da177e4 LT |
814 | return 0; |
815 | ||
816 | fail_put: | |
817 | put_disk(disk); | |
818 | fail_free: | |
819 | kfree(cd); | |
820 | fail: | |
6fe8c1db | 821 | scsi_autopm_put_device(sdev); |
1da177e4 LT |
822 | return error; |
823 | } | |
824 | ||
825 | ||
826 | static void get_sectorsize(struct scsi_cd *cd) | |
827 | { | |
828 | unsigned char cmd[10]; | |
62858dac | 829 | unsigned char buffer[8]; |
1da177e4 LT |
830 | int the_result, retries = 3; |
831 | int sector_size; | |
165125e1 | 832 | struct request_queue *queue; |
1da177e4 | 833 | |
1da177e4 LT |
834 | do { |
835 | cmd[0] = READ_CAPACITY; | |
836 | memset((void *) &cmd[1], 0, 9); | |
62858dac | 837 | memset(buffer, 0, sizeof(buffer)); |
1da177e4 LT |
838 | |
839 | /* Do the command and wait.. */ | |
820732b5 | 840 | the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, |
62858dac | 841 | buffer, sizeof(buffer), NULL, |
f4f4e47e | 842 | SR_TIMEOUT, MAX_RETRIES, NULL); |
1da177e4 | 843 | |
1da177e4 LT |
844 | retries--; |
845 | ||
846 | } while (the_result && retries); | |
847 | ||
848 | ||
1da177e4 LT |
849 | if (the_result) { |
850 | cd->capacity = 0x1fffff; | |
851 | sector_size = 2048; /* A guess, just in case */ | |
1da177e4 | 852 | } else { |
5915136d TH |
853 | long last_written; |
854 | ||
855 | cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | | |
856 | (buffer[2] << 8) | buffer[3]); | |
857 | /* | |
858 | * READ_CAPACITY doesn't return the correct size on | |
859 | * certain UDF media. If last_written is larger, use | |
860 | * it instead. | |
861 | * | |
862 | * http://bugzilla.kernel.org/show_bug.cgi?id=9668 | |
863 | */ | |
864 | if (!cdrom_get_last_written(&cd->cdi, &last_written)) | |
865 | cd->capacity = max_t(long, cd->capacity, last_written); | |
866 | ||
1da177e4 LT |
867 | sector_size = (buffer[4] << 24) | |
868 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; | |
869 | switch (sector_size) { | |
870 | /* | |
871 | * HP 4020i CD-Recorder reports 2340 byte sectors | |
872 | * Philips CD-Writers report 2352 byte sectors | |
873 | * | |
874 | * Use 2k sectors for them.. | |
875 | */ | |
876 | case 0: | |
877 | case 2340: | |
878 | case 2352: | |
879 | sector_size = 2048; | |
880 | /* fall through */ | |
881 | case 2048: | |
882 | cd->capacity *= 4; | |
883 | /* fall through */ | |
884 | case 512: | |
885 | break; | |
886 | default: | |
96eefad2 HR |
887 | sr_printk(KERN_INFO, cd, |
888 | "unsupported sector size %d.", sector_size); | |
1da177e4 | 889 | cd->capacity = 0; |
1da177e4 LT |
890 | } |
891 | ||
892 | cd->device->sector_size = sector_size; | |
893 | ||
894 | /* | |
895 | * Add this so that we have the ability to correctly gauge | |
896 | * what the device is capable of. | |
897 | */ | |
1da177e4 LT |
898 | set_capacity(cd->disk, cd->capacity); |
899 | } | |
900 | ||
901 | queue = cd->device->request_queue; | |
e1defc4f | 902 | blk_queue_logical_block_size(queue, sector_size); |
1da177e4 | 903 | |
62858dac | 904 | return; |
1da177e4 LT |
905 | } |
906 | ||
907 | static void get_capabilities(struct scsi_cd *cd) | |
908 | { | |
909 | unsigned char *buffer; | |
910 | struct scsi_mode_data data; | |
820732b5 | 911 | struct scsi_sense_hdr sshdr; |
a00a7862 | 912 | unsigned int ms_len = 128; |
38582a62 | 913 | int rc, n; |
1da177e4 | 914 | |
0ad78200 | 915 | static const char *loadmech[] = |
1da177e4 LT |
916 | { |
917 | "caddy", | |
918 | "tray", | |
919 | "pop-up", | |
920 | "", | |
921 | "changer", | |
922 | "cartridge changer", | |
923 | "", | |
924 | "" | |
925 | }; | |
926 | ||
1da177e4 LT |
927 | |
928 | /* allocate transfer buffer */ | |
929 | buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); | |
930 | if (!buffer) { | |
96eefad2 | 931 | sr_printk(KERN_ERR, cd, "out of memory.\n"); |
1da177e4 LT |
932 | return; |
933 | } | |
934 | ||
38582a62 | 935 | /* eat unit attentions */ |
9f8a2c23 | 936 | scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); |
1da177e4 LT |
937 | |
938 | /* ask for mode page 0x2a */ | |
a00a7862 | 939 | rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, |
1cf72699 | 940 | SR_TIMEOUT, 3, &data, NULL); |
1da177e4 | 941 | |
a00a7862 MP |
942 | if (!scsi_status_is_good(rc) || data.length > ms_len || |
943 | data.header_length + data.block_descriptor_length > data.length) { | |
1da177e4 LT |
944 | /* failed, drive doesn't have capabilities mode page */ |
945 | cd->cdi.speed = 1; | |
946 | cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | | |
bcc1e382 CE |
947 | CDC_DVD | CDC_DVD_RAM | |
948 | CDC_SELECT_DISC | CDC_SELECT_SPEED | | |
949 | CDC_MRW | CDC_MRW_W | CDC_RAM); | |
1da177e4 | 950 | kfree(buffer); |
96eefad2 | 951 | sr_printk(KERN_INFO, cd, "scsi-1 drive"); |
1da177e4 LT |
952 | return; |
953 | } | |
954 | ||
955 | n = data.header_length + data.block_descriptor_length; | |
956 | cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; | |
957 | cd->readcd_known = 1; | |
958 | cd->readcd_cdda = buffer[n + 5] & 0x01; | |
959 | /* print some capability bits */ | |
96eefad2 HR |
960 | sr_printk(KERN_INFO, cd, |
961 | "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", | |
962 | ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, | |
963 | cd->cdi.speed, | |
964 | buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ | |
965 | buffer[n + 3] & 0x20 ? "dvd-ram " : "", | |
966 | buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ | |
967 | buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ | |
968 | buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ | |
969 | loadmech[buffer[n + 6] >> 5]); | |
1da177e4 LT |
970 | if ((buffer[n + 6] >> 5) == 0) |
971 | /* caddy drives can't close tray... */ | |
972 | cd->cdi.mask |= CDC_CLOSE_TRAY; | |
973 | if ((buffer[n + 2] & 0x8) == 0) | |
974 | /* not a DVD drive */ | |
975 | cd->cdi.mask |= CDC_DVD; | |
96eefad2 | 976 | if ((buffer[n + 3] & 0x20) == 0) |
1da177e4 LT |
977 | /* can't write DVD-RAM media */ |
978 | cd->cdi.mask |= CDC_DVD_RAM; | |
979 | if ((buffer[n + 3] & 0x10) == 0) | |
980 | /* can't write DVD-R media */ | |
981 | cd->cdi.mask |= CDC_DVD_R; | |
982 | if ((buffer[n + 3] & 0x2) == 0) | |
983 | /* can't write CD-RW media */ | |
984 | cd->cdi.mask |= CDC_CD_RW; | |
985 | if ((buffer[n + 3] & 0x1) == 0) | |
986 | /* can't write CD-R media */ | |
987 | cd->cdi.mask |= CDC_CD_R; | |
988 | if ((buffer[n + 6] & 0x8) == 0) | |
989 | /* can't eject */ | |
990 | cd->cdi.mask |= CDC_OPEN_TRAY; | |
991 | ||
992 | if ((buffer[n + 6] >> 5) == mechtype_individual_changer || | |
993 | (buffer[n + 6] >> 5) == mechtype_cartridge_changer) | |
994 | cd->cdi.capacity = | |
995 | cdrom_number_of_slots(&cd->cdi); | |
996 | if (cd->cdi.capacity <= 1) | |
997 | /* not a changer */ | |
998 | cd->cdi.mask |= CDC_SELECT_DISC; | |
999 | /*else I don't think it can close its tray | |
1000 | cd->cdi.mask |= CDC_CLOSE_TRAY; */ | |
1001 | ||
1002 | /* | |
1003 | * if DVD-RAM, MRW-W or CD-RW, we are randomly writable | |
1004 | */ | |
1005 | if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != | |
1006 | (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { | |
fd2eb903 | 1007 | cd->writeable = 1; |
1da177e4 LT |
1008 | } |
1009 | ||
1da177e4 LT |
1010 | kfree(buffer); |
1011 | } | |
1012 | ||
1013 | /* | |
1014 | * sr_packet() is the entry point for the generic commands generated | |
96eefad2 | 1015 | * by the Uniform CD-ROM layer. |
1da177e4 LT |
1016 | */ |
1017 | static int sr_packet(struct cdrom_device_info *cdi, | |
1018 | struct packet_command *cgc) | |
1019 | { | |
8e04d805 HG |
1020 | struct scsi_cd *cd = cdi->handle; |
1021 | struct scsi_device *sdev = cd->device; | |
1022 | ||
1023 | if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) | |
1024 | return -EDRIVE_CANT_DO_THIS; | |
1025 | ||
1da177e4 LT |
1026 | if (cgc->timeout <= 0) |
1027 | cgc->timeout = IOCTL_TIMEOUT; | |
1028 | ||
8e04d805 | 1029 | sr_do_ioctl(cd, cgc); |
1da177e4 LT |
1030 | |
1031 | return cgc->stat; | |
1032 | } | |
1033 | ||
1034 | /** | |
1035 | * sr_kref_release - Called to free the scsi_cd structure | |
1036 | * @kref: pointer to embedded kref | |
1037 | * | |
0b950672 | 1038 | * sr_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
1039 | * called on last put, you should always use the scsi_cd_get() |
1040 | * scsi_cd_put() helpers which manipulate the semaphore directly | |
1041 | * and never do a direct kref_put(). | |
1042 | **/ | |
1043 | static void sr_kref_release(struct kref *kref) | |
1044 | { | |
1045 | struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); | |
1046 | struct gendisk *disk = cd->disk; | |
1047 | ||
1048 | spin_lock(&sr_index_lock); | |
f331c029 | 1049 | clear_bit(MINOR(disk_devt(disk)), sr_index_bits); |
1da177e4 LT |
1050 | spin_unlock(&sr_index_lock); |
1051 | ||
1052 | unregister_cdrom(&cd->cdi); | |
1053 | ||
1054 | disk->private_data = NULL; | |
1055 | ||
1056 | put_disk(disk); | |
1057 | ||
1058 | kfree(cd); | |
1059 | } | |
1060 | ||
1061 | static int sr_remove(struct device *dev) | |
1062 | { | |
1063 | struct scsi_cd *cd = dev_get_drvdata(dev); | |
1064 | ||
6c7f1e2f AL |
1065 | scsi_autopm_get_device(cd->device); |
1066 | ||
1da177e4 | 1067 | del_gendisk(cd->disk); |
13b43891 | 1068 | dev_set_drvdata(dev, NULL); |
1da177e4 | 1069 | |
0b950672 | 1070 | mutex_lock(&sr_ref_mutex); |
1da177e4 | 1071 | kref_put(&cd->kref, sr_kref_release); |
0b950672 | 1072 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
1073 | |
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | static int __init init_sr(void) | |
1078 | { | |
1079 | int rc; | |
1080 | ||
1081 | rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1082 | if (rc) | |
1083 | return rc; | |
da3962fe AM |
1084 | rc = scsi_register_driver(&sr_template.gendrv); |
1085 | if (rc) | |
1086 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1087 | ||
1088 | return rc; | |
1da177e4 LT |
1089 | } |
1090 | ||
1091 | static void __exit exit_sr(void) | |
1092 | { | |
1093 | scsi_unregister_driver(&sr_template.gendrv); | |
1094 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1095 | } | |
1096 | ||
1097 | module_init(init_sr); | |
1098 | module_exit(exit_sr); | |
1099 | MODULE_LICENSE("GPL"); |