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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#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>
Arjan van de Ven0b950672006-01-11 13:16:10 +010046#include <linux/mutex.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090047#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <asm/uaccess.h>
49
50#include <scsi/scsi.h>
51#include <scsi/scsi_dbg.h>
52#include <scsi/scsi_device.h>
53#include <scsi/scsi_driver.h>
James Bottomley820732b2005-06-12 22:21:29 -050054#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#include <scsi/scsi_eh.h>
56#include <scsi/scsi_host.h>
57#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59#include "scsi_logging.h"
60#include "sr.h"
61
62
Rene Hermanf018fa52006-03-08 00:14:20 -080063MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
64MODULE_LICENSE("GPL");
65MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
Michael Tokarevd7b8bcb2006-10-27 16:02:37 +040066MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
67MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
Rene Hermanf018fa52006-03-08 00:14:20 -080068
Linus Torvalds1da177e2005-04-16 15:20:36 -070069#define SR_DISKS 256
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#define SR_CAPABILITIES \
72 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
73 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
Christoph Hellwig6a2900b2006-03-23 03:00:15 -080074 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
76 CDC_MRW|CDC_MRW_W|CDC_RAM)
77
Arnd Bergmann2a48fc02010-06-02 14:28:52 +020078static DEFINE_MUTEX(sr_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079static int sr_probe(struct device *);
80static int sr_remove(struct device *);
Linus Torvalds7b3d9542008-01-06 10:17:12 -080081static int sr_done(struct scsi_cmnd *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83static struct scsi_driver sr_template = {
84 .owner = THIS_MODULE,
85 .gendrv = {
86 .name = "sr",
87 .probe = sr_probe,
88 .remove = sr_remove,
89 },
Linus Torvalds7b3d9542008-01-06 10:17:12 -080090 .done = sr_done,
Linus Torvalds1da177e2005-04-16 15:20:36 -070091};
92
93static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
94static DEFINE_SPINLOCK(sr_index_lock);
95
96/* This semaphore is used to mediate the 0->1 reference get in the
97 * face of object destruction (i.e. we can't allow a get on an
98 * object after last put) */
Arjan van de Ven0b950672006-01-11 13:16:10 +010099static DEFINE_MUTEX(sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101static int sr_open(struct cdrom_device_info *, int);
102static void sr_release(struct cdrom_device_info *);
103
104static void get_sectorsize(struct scsi_cd *);
105static void get_capabilities(struct scsi_cd *);
106
Tejun Heo93aae172010-12-16 17:52:17 +0100107static unsigned int sr_check_events(struct cdrom_device_info *cdi,
108 unsigned int clearing, int slot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109static int sr_packet(struct cdrom_device_info *, struct packet_command *);
110
111static struct cdrom_device_ops sr_dops = {
112 .open = sr_open,
113 .release = sr_release,
114 .drive_status = sr_drive_status,
Tejun Heo93aae172010-12-16 17:52:17 +0100115 .check_events = sr_check_events,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 .tray_move = sr_tray_move,
117 .lock_door = sr_lock_door,
118 .select_speed = sr_select_speed,
119 .get_last_session = sr_get_last_session,
120 .get_mcn = sr_get_mcn,
121 .reset = sr_reset,
122 .audio_ioctl = sr_audio_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 .capability = SR_CAPABILITIES,
124 .generic_packet = sr_packet,
125};
126
127static void sr_kref_release(struct kref *kref);
128
129static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
130{
131 return container_of(disk->private_data, struct scsi_cd, driver);
132}
133
134/*
135 * The get and put routines for the struct scsi_cd. Note this entity
136 * has a scsi_device pointer and owns a reference to this.
137 */
138static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
139{
140 struct scsi_cd *cd = NULL;
141
Arjan van de Ven0b950672006-01-11 13:16:10 +0100142 mutex_lock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 if (disk->private_data == NULL)
144 goto out;
145 cd = scsi_cd(disk);
146 kref_get(&cd->kref);
147 if (scsi_device_get(cd->device))
148 goto out_put;
149 goto out;
150
151 out_put:
152 kref_put(&cd->kref, sr_kref_release);
153 cd = NULL;
154 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +0100155 mutex_unlock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 return cd;
157}
158
Arjan van de Ven858119e2006-01-14 13:20:43 -0800159static void scsi_cd_put(struct scsi_cd *cd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160{
161 struct scsi_device *sdev = cd->device;
162
Arjan van de Ven0b950672006-01-11 13:16:10 +0100163 mutex_lock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 kref_put(&cd->kref, sr_kref_release);
165 scsi_device_put(sdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100166 mutex_unlock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167}
168
Tejun Heo93aae172010-12-16 17:52:17 +0100169static unsigned int sr_get_events(struct scsi_device *sdev)
170{
171 u8 buf[8];
172 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
173 1, /* polled */
174 0, 0, /* reserved */
175 1 << 4, /* notification class: media */
176 0, 0, /* reserved */
177 0, sizeof(buf), /* allocation length */
178 0, /* control */
179 };
180 struct event_header *eh = (void *)buf;
181 struct media_event_desc *med = (void *)(buf + 4);
182 struct scsi_sense_hdr sshdr;
183 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
Tejun Heo93aae172010-12-16 17:52:17 +0100185 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf),
186 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL);
187 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
188 return DISK_EVENT_MEDIA_CHANGE;
189
190 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
191 return 0;
192
193 if (eh->nea || eh->notification_class != 0x4)
194 return 0;
195
196 if (med->media_event_code == 1)
197 return DISK_EVENT_EJECT_REQUEST;
198 else if (med->media_event_code == 2)
199 return DISK_EVENT_MEDIA_CHANGE;
200 return 0;
201}
202
203/*
204 * This function checks to see if the media has been changed or eject
205 * button has been pressed. It is possible that we have already
206 * sensed a change, or the drive may have sensed one and not yet
207 * reported it. The past events are accumulated in sdev->changed and
208 * returned together with the current state.
209 */
210static unsigned int sr_check_events(struct cdrom_device_info *cdi,
211 unsigned int clearing, int slot)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212{
213 struct scsi_cd *cd = cdi->handle;
Tejun Heo93aae172010-12-16 17:52:17 +0100214 bool last_present;
215 struct scsi_sense_hdr sshdr;
216 unsigned int events;
217 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Tejun Heo93aae172010-12-16 17:52:17 +0100219 /* no changer support */
220 if (CDSL_CURRENT != slot)
221 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Tejun Heo93aae172010-12-16 17:52:17 +0100223 events = sr_get_events(cd->device);
Kay Sievers79b96772011-06-30 15:03:48 +0200224 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
225
226 /*
227 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
228 * for several times in a row. We rely on TUR only for this likely
229 * broken device, to prevent generating incorrect media changed
230 * events for every open().
231 */
232 if (cd->ignore_get_event) {
233 events &= ~DISK_EVENT_MEDIA_CHANGE;
234 goto do_tur;
235 }
236
Tejun Heo93aae172010-12-16 17:52:17 +0100237 /*
238 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
239 * is being cleared. Note that there are devices which hang
240 * if asked to execute TUR repeatedly.
241 */
Kay Sievers79b96772011-06-30 15:03:48 +0200242 if (cd->device->changed) {
243 events |= DISK_EVENT_MEDIA_CHANGE;
244 cd->device->changed = 0;
245 cd->tur_changed = true;
246 }
Tejun Heo93aae172010-12-16 17:52:17 +0100247
Kay Sievers79b96772011-06-30 15:03:48 +0200248 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
249 return events;
250do_tur:
Tejun Heo93aae172010-12-16 17:52:17 +0100251 /* let's see whether the media is there with TUR */
252 last_present = cd->media_present;
253 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
254
Tejun Heo638428e2010-12-09 11:18:42 +0100255 /*
256 * Media is considered to be present if TUR succeeds or fails with
257 * sense data indicating something other than media-not-present
258 * (ASC 0x3a).
259 */
Tejun Heo93aae172010-12-16 17:52:17 +0100260 cd->media_present = scsi_status_is_good(ret) ||
261 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Tejun Heo93aae172010-12-16 17:52:17 +0100263 if (last_present != cd->media_present)
Kay Sievers79b96772011-06-30 15:03:48 +0200264 cd->device->changed = 1;
265
Tejun Heo93aae172010-12-16 17:52:17 +0100266 if (cd->device->changed) {
267 events |= DISK_EVENT_MEDIA_CHANGE;
268 cd->device->changed = 0;
Kay Sievers79b96772011-06-30 15:03:48 +0200269 cd->tur_changed = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 }
Kay Sievers285e9672007-08-14 14:10:39 +0200271
Kay Sievers79b96772011-06-30 15:03:48 +0200272 if (cd->ignore_get_event)
273 return events;
274
275 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
276 if (!cd->tur_changed) {
277 if (cd->get_event_changed) {
278 if (cd->tur_mismatch++ > 8) {
279 sdev_printk(KERN_WARNING, cd->device,
280 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
281 cd->ignore_get_event = true;
282 }
283 } else {
284 cd->tur_mismatch = 0;
285 }
286 }
287 cd->tur_changed = false;
288 cd->get_event_changed = false;
289
Tejun Heo93aae172010-12-16 17:52:17 +0100290 return events;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291}
Tejun Heo93aae172010-12-16 17:52:17 +0100292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293/*
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800294 * sr_done is the interrupt routine for the device driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 *
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800296 * It will be notified on the end of a SCSI read / write, and will take one
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 * of several actions based on success or failure.
298 */
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800299static int sr_done(struct scsi_cmnd *SCpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
301 int result = SCpnt->result;
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200302 int this_count = scsi_bufflen(SCpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 int good_bytes = (result == 0 ? this_count : 0);
304 int block_sectors = 0;
305 long error_sector;
306 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
307
308#ifdef DEBUG
309 printk("sr.c done: %x\n", result);
310#endif
311
312 /*
313 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
314 * success. Since this is a relatively rare error condition, no
315 * care is taken to avoid unnecessary additional work such as
316 * memcpy's that could be avoided.
317 */
318 if (driver_byte(result) != 0 && /* An error occurred */
319 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
320 switch (SCpnt->sense_buffer[2]) {
321 case MEDIUM_ERROR:
322 case VOLUME_OVERFLOW:
323 case ILLEGAL_REQUEST:
324 if (!(SCpnt->sense_buffer[0] & 0x90))
325 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 error_sector = (SCpnt->sense_buffer[3] << 24) |
327 (SCpnt->sense_buffer[4] << 16) |
328 (SCpnt->sense_buffer[5] << 8) |
329 SCpnt->sense_buffer[6];
330 if (SCpnt->request->bio != NULL)
331 block_sectors =
332 bio_sectors(SCpnt->request->bio);
333 if (block_sectors < 4)
334 block_sectors = 4;
335 if (cd->device->sector_size == 2048)
336 error_sector <<= 2;
337 error_sector &= ~(block_sectors - 1);
Tejun Heo83096eb2009-05-07 22:24:39 +0900338 good_bytes = (error_sector -
339 blk_rq_pos(SCpnt->request)) << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 if (good_bytes < 0 || good_bytes >= this_count)
341 good_bytes = 0;
342 /*
343 * The SCSI specification allows for the value
344 * returned by READ CAPACITY to be up to 75 2K
345 * sectors past the last readable block.
346 * Therefore, if we hit a medium error within the
347 * last 75 2K sectors, we decrease the saved size
348 * value.
349 */
350 if (error_sector < get_capacity(cd->disk) &&
351 cd->capacity - error_sector < 4 * 75)
352 set_capacity(cd->disk, error_sector);
353 break;
354
355 case RECOVERED_ERROR:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 good_bytes = this_count;
357 break;
358
359 default:
360 break;
361 }
362 }
363
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800364 return good_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365}
366
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500367static int sr_prep_fn(struct request_queue *q, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368{
Jens Axboe242f9dc2008-09-14 05:55:09 -0700369 int block = 0, this_count, s_size;
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500370 struct scsi_cd *cd;
371 struct scsi_cmnd *SCpnt;
372 struct scsi_device *sdp = q->queuedata;
373 int ret;
374
375 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
376 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
377 goto out;
378 } else if (rq->cmd_type != REQ_TYPE_FS) {
379 ret = BLKPREP_KILL;
380 goto out;
381 }
382 ret = scsi_setup_fs_cmnd(sdp, rq);
383 if (ret != BLKPREP_OK)
384 goto out;
385 SCpnt = rq->special;
386 cd = scsi_cd(rq->rq_disk);
387
388 /* from here on until we're complete, any goto out
389 * is used for a killable error condition */
390 ret = BLKPREP_KILL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
392 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n",
393 cd->disk->disk_name, block));
394
395 if (!cd->device || !scsi_device_online(cd->device)) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900396 SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n",
397 blk_rq_sectors(rq)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500399 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 }
401
402 if (cd->device->changed) {
403 /*
404 * quietly refuse to do anything to a changed disc until the
405 * changed bit has been reset
406 */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500407 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 }
409
410 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 * we do lazy blocksize switching (when reading XA sectors,
412 * see CDROMREADMODE2 ioctl)
413 */
414 s_size = cd->device->sector_size;
415 if (s_size > 2048) {
416 if (!in_interrupt())
417 sr_set_blocklength(cd, 2048);
418 else
419 printk("sr: can't switch blocksize: in interrupt\n");
420 }
421
422 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400423 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500424 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 }
426
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500427 if (rq_data_dir(rq) == WRITE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 if (!cd->device->writeable)
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500429 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 SCpnt->cmnd[0] = WRITE_10;
431 SCpnt->sc_data_direction = DMA_TO_DEVICE;
432 cd->cdi.media_written = 1;
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500433 } else if (rq_data_dir(rq) == READ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 SCpnt->cmnd[0] = READ_10;
435 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
436 } else {
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500437 blk_dump_rq_flags(rq, "Unknown sr command");
438 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 }
440
441 {
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200442 struct scatterlist *sg;
443 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200445 scsi_for_each_sg(SCpnt, sg, sg_count, i)
446 size += sg->length;
447
448 if (size != scsi_bufflen(SCpnt)) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400449 scmd_printk(KERN_ERR, SCpnt,
450 "mismatch count %d, bytes %d\n",
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200451 size, scsi_bufflen(SCpnt));
452 if (scsi_bufflen(SCpnt) > size)
453 SCpnt->sdb.length = size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 }
455 }
456
457 /*
458 * request doesn't start on hw block boundary, add scatter pads
459 */
Tejun Heo83096eb2009-05-07 22:24:39 +0900460 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200461 (scsi_bufflen(SCpnt) % s_size)) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400462 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500463 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 }
465
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200466 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
468
Tejun Heo83096eb2009-05-07 22:24:39 +0900469 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 cd->cdi.name,
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500471 (rq_data_dir(rq) == WRITE) ?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 "writing" : "reading",
Tejun Heo83096eb2009-05-07 22:24:39 +0900473 this_count, blk_rq_sectors(rq)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475 SCpnt->cmnd[1] = 0;
Tejun Heo83096eb2009-05-07 22:24:39 +0900476 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
478 if (this_count > 0xffff) {
479 this_count = 0xffff;
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200480 SCpnt->sdb.length = this_count * s_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 }
482
483 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
484 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
485 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
486 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
487 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
488 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
489 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
490
491 /*
492 * We shouldn't disconnect in the middle of a sector, so with a dumb
493 * host adapter, it's safe to assume that we can at least transfer
494 * this many bytes between each connect / disconnect.
495 */
496 SCpnt->transfersize = cd->device->sector_size;
497 SCpnt->underflow = this_count << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 SCpnt->allowed = MAX_RETRIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 * This indicates that the command is ready from our end to be
502 * queued.
503 */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500504 ret = BLKPREP_OK;
505 out:
506 return scsi_prep_return(q, rq, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507}
508
Al Viro40cc51b2008-03-02 10:41:28 -0500509static int sr_block_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510{
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200511 struct scsi_cd *cd;
Al Viro40cc51b2008-03-02 10:41:28 -0500512 int ret = -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200514 mutex_lock(&sr_mutex);
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200515 cd = scsi_cd_get(bdev->bd_disk);
Al Viro40cc51b2008-03-02 10:41:28 -0500516 if (cd) {
517 ret = cdrom_open(&cd->cdi, bdev, mode);
518 if (ret)
519 scsi_cd_put(cd);
520 }
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200521 mutex_unlock(&sr_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 return ret;
523}
524
Al Viro40cc51b2008-03-02 10:41:28 -0500525static int sr_block_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526{
Al Viro40cc51b2008-03-02 10:41:28 -0500527 struct scsi_cd *cd = scsi_cd(disk);
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200528 mutex_lock(&sr_mutex);
Al Viro40cc51b2008-03-02 10:41:28 -0500529 cdrom_release(&cd->cdi, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 scsi_cd_put(cd);
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200531 mutex_unlock(&sr_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 return 0;
533}
534
Al Viro40cc51b2008-03-02 10:41:28 -0500535static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 unsigned long arg)
537{
Al Viro40cc51b2008-03-02 10:41:28 -0500538 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 struct scsi_device *sdev = cd->device;
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800540 void __user *argp = (void __user *)arg;
541 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200543 mutex_lock(&sr_mutex);
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200544
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800545 /*
546 * Send SCSI addressing ioctls directly to mid level, send other
547 * ioctls to cdrom/block level.
548 */
549 switch (cmd) {
550 case SCSI_IOCTL_GET_IDLUN:
551 case SCSI_IOCTL_GET_BUS_NUMBER:
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200552 ret = scsi_ioctl(sdev, cmd, argp);
553 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 }
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800555
Al Viro40cc51b2008-03-02 10:41:28 -0500556 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
Tejun Heo63972562007-01-02 17:41:04 +0900557 if (ret != -ENOSYS)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200558 goto out;
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800559
560 /*
561 * ENODEV means that we didn't recognise the ioctl, or that we
562 * cannot execute it in the current device state. In either
563 * case fall through to scsi_ioctl, which will return ENDOEV again
564 * if it doesn't recognise the ioctl
565 */
Al Viro83ff6fe2008-03-02 08:15:49 -0500566 ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
Christoph Hellwigfd4ce1a2008-11-05 14:58:42 +0100567 (mode & FMODE_NDELAY) != 0);
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800568 if (ret != -ENODEV)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200569 goto out;
570 ret = scsi_ioctl(sdev, cmd, argp);
571
572out:
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200573 mutex_unlock(&sr_mutex);
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200574 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575}
576
Tejun Heo93aae172010-12-16 17:52:17 +0100577static unsigned int sr_block_check_events(struct gendisk *disk,
578 unsigned int clearing)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579{
580 struct scsi_cd *cd = scsi_cd(disk);
Tejun Heo93aae172010-12-16 17:52:17 +0100581 return cdrom_check_events(&cd->cdi, clearing);
582}
583
584static int sr_block_revalidate_disk(struct gendisk *disk)
585{
586 struct scsi_cd *cd = scsi_cd(disk);
587 struct scsi_sense_hdr sshdr;
588
589 /* if the unit is not ready, nothing more to do */
590 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
591 return 0;
592
593 sr_cd_check(&cd->cdi);
594 get_sectorsize(cd);
595 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596}
597
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700598static const struct block_device_operations sr_bdops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599{
600 .owner = THIS_MODULE,
Al Viro40cc51b2008-03-02 10:41:28 -0500601 .open = sr_block_open,
602 .release = sr_block_release,
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200603 .ioctl = sr_block_ioctl,
Tejun Heo93aae172010-12-16 17:52:17 +0100604 .check_events = sr_block_check_events,
605 .revalidate_disk = sr_block_revalidate_disk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 /*
607 * No compat_ioctl for now because sr_block_ioctl never
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300608 * seems to pass arbitrary ioctls down to host drivers.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 */
610};
611
612static int sr_open(struct cdrom_device_info *cdi, int purpose)
613{
614 struct scsi_cd *cd = cdi->handle;
615 struct scsi_device *sdev = cd->device;
616 int retval;
617
618 /*
619 * If the device is in error recovery, wait until it is done.
620 * If the device is offline, then disallow any access to it.
621 */
622 retval = -ENXIO;
623 if (!scsi_block_when_processing_errors(sdev))
624 goto error_out;
625
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 return 0;
627
628error_out:
629 return retval;
630}
631
632static void sr_release(struct cdrom_device_info *cdi)
633{
634 struct scsi_cd *cd = cdi->handle;
635
636 if (cd->device->sector_size > 2048)
637 sr_set_blocklength(cd, 2048);
638
639}
640
641static int sr_probe(struct device *dev)
642{
643 struct scsi_device *sdev = to_scsi_device(dev);
644 struct gendisk *disk;
645 struct scsi_cd *cd;
646 int minor, error;
647
648 error = -ENODEV;
649 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
650 goto fail;
651
652 error = -ENOMEM;
Jes Sorensen24669f752006-01-16 10:31:18 -0500653 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 if (!cd)
655 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
657 kref_init(&cd->kref);
658
659 disk = alloc_disk(1);
660 if (!disk)
661 goto fail_free;
662
663 spin_lock(&sr_index_lock);
664 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
665 if (minor == SR_DISKS) {
666 spin_unlock(&sr_index_lock);
667 error = -EBUSY;
668 goto fail_put;
669 }
670 __set_bit(minor, sr_index_bits);
671 spin_unlock(&sr_index_lock);
672
673 disk->major = SCSI_CDROM_MAJOR;
674 disk->first_minor = minor;
675 sprintf(disk->disk_name, "sr%d", minor);
676 disk->fops = &sr_bdops;
Tejun Heod4dc2102011-04-21 20:54:46 +0200677 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
Tejun Heo93aae172010-12-16 17:52:17 +0100678 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
Jens Axboe242f9dc2008-09-14 05:55:09 -0700680 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
681
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 cd->device = sdev;
683 cd->disk = disk;
684 cd->driver = &sr_template;
685 cd->disk = disk;
686 cd->capacity = 0x1fffff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 cd->device->changed = 1; /* force recheck CD type */
Tejun Heo93aae172010-12-16 17:52:17 +0100688 cd->media_present = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 cd->use = 1;
690 cd->readcd_known = 0;
691 cd->readcd_cdda = 0;
692
693 cd->cdi.ops = &sr_dops;
694 cd->cdi.handle = cd;
695 cd->cdi.mask = 0;
696 cd->cdi.capacity = 1;
697 sprintf(cd->cdi.name, "sr%d", minor);
698
699 sdev->sector_size = 2048; /* A guess, just in case */
700
701 /* FIXME: need to handle a get_capabilities failure properly ?? */
702 get_capabilities(cd);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500703 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 sr_vendor_init(cd);
705
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 disk->driverfs_dev = &sdev->sdev_gendev;
707 set_capacity(disk, cd->capacity);
708 disk->private_data = &cd->driver;
709 disk->queue = sdev->request_queue;
710 cd->cdi.disk = disk;
711
712 if (register_cdrom(&cd->cdi))
713 goto fail_put;
714
715 dev_set_drvdata(dev, cd);
716 disk->flags |= GENHD_FL_REMOVABLE;
717 add_disk(disk);
718
James Bottomley9ccfc752005-10-02 11:45:08 -0500719 sdev_printk(KERN_DEBUG, sdev,
720 "Attached scsi CD-ROM %s\n", cd->cdi.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 return 0;
722
723fail_put:
724 put_disk(disk);
725fail_free:
726 kfree(cd);
727fail:
728 return error;
729}
730
731
732static void get_sectorsize(struct scsi_cd *cd)
733{
734 unsigned char cmd[10];
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200735 unsigned char buffer[8];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 int the_result, retries = 3;
737 int sector_size;
Jens Axboe165125e2007-07-24 09:28:11 +0200738 struct request_queue *queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 do {
741 cmd[0] = READ_CAPACITY;
742 memset((void *) &cmd[1], 0, 9);
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200743 memset(buffer, 0, sizeof(buffer));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
745 /* Do the command and wait.. */
James Bottomley820732b2005-06-12 22:21:29 -0500746 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200747 buffer, sizeof(buffer), NULL,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900748 SR_TIMEOUT, MAX_RETRIES, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 retries--;
751
752 } while (the_result && retries);
753
754
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 if (the_result) {
756 cd->capacity = 0x1fffff;
757 sector_size = 2048; /* A guess, just in case */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 } else {
Tejun Heo59151362009-09-04 11:38:02 +0900759 long last_written;
760
761 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) |
762 (buffer[2] << 8) | buffer[3]);
763 /*
764 * READ_CAPACITY doesn't return the correct size on
765 * certain UDF media. If last_written is larger, use
766 * it instead.
767 *
768 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
769 */
770 if (!cdrom_get_last_written(&cd->cdi, &last_written))
771 cd->capacity = max_t(long, cd->capacity, last_written);
772
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 sector_size = (buffer[4] << 24) |
774 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
775 switch (sector_size) {
776 /*
777 * HP 4020i CD-Recorder reports 2340 byte sectors
778 * Philips CD-Writers report 2352 byte sectors
779 *
780 * Use 2k sectors for them..
781 */
782 case 0:
783 case 2340:
784 case 2352:
785 sector_size = 2048;
786 /* fall through */
787 case 2048:
788 cd->capacity *= 4;
789 /* fall through */
790 case 512:
791 break;
792 default:
793 printk("%s: unsupported sector size %d.\n",
794 cd->cdi.name, sector_size);
795 cd->capacity = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 }
797
798 cd->device->sector_size = sector_size;
799
800 /*
801 * Add this so that we have the ability to correctly gauge
802 * what the device is capable of.
803 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 set_capacity(cd->disk, cd->capacity);
805 }
806
807 queue = cd->device->request_queue;
Martin K. Petersene1defc42009-05-22 17:17:49 -0400808 blk_queue_logical_block_size(queue, sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200810 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811}
812
813static void get_capabilities(struct scsi_cd *cd)
814{
815 unsigned char *buffer;
816 struct scsi_mode_data data;
James Bottomley820732b2005-06-12 22:21:29 -0500817 struct scsi_sense_hdr sshdr;
James Bottomley38582a62008-02-06 13:01:58 -0600818 int rc, n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
Arjan van de Ven0ad78202005-11-28 16:22:25 +0100820 static const char *loadmech[] =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 {
822 "caddy",
823 "tray",
824 "pop-up",
825 "",
826 "changer",
827 "cartridge changer",
828 "",
829 ""
830 };
831
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832
833 /* allocate transfer buffer */
834 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
835 if (!buffer) {
836 printk(KERN_ERR "sr: out of memory.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 return;
838 }
839
James Bottomley38582a62008-02-06 13:01:58 -0600840 /* eat unit attentions */
Tejun Heo9f8a2c22010-12-08 20:57:40 +0100841 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
843 /* ask for mode page 0x2a */
844 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
James Bottomley1cf72692005-08-28 11:27:01 -0500845 SR_TIMEOUT, 3, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846
847 if (!scsi_status_is_good(rc)) {
848 /* failed, drive doesn't have capabilities mode page */
849 cd->cdi.speed = 1;
850 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
Chuck Ebbertbcc1e382006-01-11 23:58:40 -0500851 CDC_DVD | CDC_DVD_RAM |
852 CDC_SELECT_DISC | CDC_SELECT_SPEED |
853 CDC_MRW | CDC_MRW_W | CDC_RAM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 kfree(buffer);
855 printk("%s: scsi-1 drive\n", cd->cdi.name);
856 return;
857 }
858
859 n = data.header_length + data.block_descriptor_length;
860 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
861 cd->readcd_known = 1;
862 cd->readcd_cdda = buffer[n + 5] & 0x01;
863 /* print some capability bits */
864 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name,
865 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
866 cd->cdi.speed,
867 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
868 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
869 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
870 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
871 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
872 loadmech[buffer[n + 6] >> 5]);
873 if ((buffer[n + 6] >> 5) == 0)
874 /* caddy drives can't close tray... */
875 cd->cdi.mask |= CDC_CLOSE_TRAY;
876 if ((buffer[n + 2] & 0x8) == 0)
877 /* not a DVD drive */
878 cd->cdi.mask |= CDC_DVD;
879 if ((buffer[n + 3] & 0x20) == 0)
880 /* can't write DVD-RAM media */
881 cd->cdi.mask |= CDC_DVD_RAM;
882 if ((buffer[n + 3] & 0x10) == 0)
883 /* can't write DVD-R media */
884 cd->cdi.mask |= CDC_DVD_R;
885 if ((buffer[n + 3] & 0x2) == 0)
886 /* can't write CD-RW media */
887 cd->cdi.mask |= CDC_CD_RW;
888 if ((buffer[n + 3] & 0x1) == 0)
889 /* can't write CD-R media */
890 cd->cdi.mask |= CDC_CD_R;
891 if ((buffer[n + 6] & 0x8) == 0)
892 /* can't eject */
893 cd->cdi.mask |= CDC_OPEN_TRAY;
894
895 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
896 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
897 cd->cdi.capacity =
898 cdrom_number_of_slots(&cd->cdi);
899 if (cd->cdi.capacity <= 1)
900 /* not a changer */
901 cd->cdi.mask |= CDC_SELECT_DISC;
902 /*else I don't think it can close its tray
903 cd->cdi.mask |= CDC_CLOSE_TRAY; */
904
905 /*
906 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
907 */
908 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
909 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
910 cd->device->writeable = 1;
911 }
912
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 kfree(buffer);
914}
915
916/*
917 * sr_packet() is the entry point for the generic commands generated
918 * by the Uniform CD-ROM layer.
919 */
920static int sr_packet(struct cdrom_device_info *cdi,
921 struct packet_command *cgc)
922{
Hans de Goede8e04d802010-10-01 14:20:08 -0700923 struct scsi_cd *cd = cdi->handle;
924 struct scsi_device *sdev = cd->device;
925
926 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
927 return -EDRIVE_CANT_DO_THIS;
928
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 if (cgc->timeout <= 0)
930 cgc->timeout = IOCTL_TIMEOUT;
931
Hans de Goede8e04d802010-10-01 14:20:08 -0700932 sr_do_ioctl(cd, cgc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
934 return cgc->stat;
935}
936
937/**
938 * sr_kref_release - Called to free the scsi_cd structure
939 * @kref: pointer to embedded kref
940 *
Arjan van de Ven0b950672006-01-11 13:16:10 +0100941 * sr_ref_mutex must be held entering this routine. Because it is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 * called on last put, you should always use the scsi_cd_get()
943 * scsi_cd_put() helpers which manipulate the semaphore directly
944 * and never do a direct kref_put().
945 **/
946static void sr_kref_release(struct kref *kref)
947{
948 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
949 struct gendisk *disk = cd->disk;
950
951 spin_lock(&sr_index_lock);
Tejun Heof331c022008-09-03 09:01:48 +0200952 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 spin_unlock(&sr_index_lock);
954
955 unregister_cdrom(&cd->cdi);
956
957 disk->private_data = NULL;
958
959 put_disk(disk);
960
961 kfree(cd);
962}
963
964static int sr_remove(struct device *dev)
965{
966 struct scsi_cd *cd = dev_get_drvdata(dev);
967
Hannes Reineckeb3912772009-06-18 09:57:18 +0200968 blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 del_gendisk(cd->disk);
970
Arjan van de Ven0b950672006-01-11 13:16:10 +0100971 mutex_lock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 kref_put(&cd->kref, sr_kref_release);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100973 mutex_unlock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974
975 return 0;
976}
977
978static int __init init_sr(void)
979{
980 int rc;
981
982 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
983 if (rc)
984 return rc;
Akinobu Mitada3962f2007-06-26 00:39:33 +0900985 rc = scsi_register_driver(&sr_template.gendrv);
986 if (rc)
987 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
988
989 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990}
991
992static void __exit exit_sr(void)
993{
994 scsi_unregister_driver(&sr_template.gendrv);
995 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
996}
997
998module_init(init_sr);
999module_exit(exit_sr);
1000MODULE_LICENSE("GPL");