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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);
224 /*
225 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
226 * is being cleared. Note that there are devices which hang
227 * if asked to execute TUR repeatedly.
228 */
229 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
230 goto skip_tur;
231
232 /* let's see whether the media is there with TUR */
233 last_present = cd->media_present;
234 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
235
Tejun Heo638428e2010-12-09 11:18:42 +0100236 /*
237 * Media is considered to be present if TUR succeeds or fails with
238 * sense data indicating something other than media-not-present
239 * (ASC 0x3a).
240 */
Tejun Heo93aae172010-12-16 17:52:17 +0100241 cd->media_present = scsi_status_is_good(ret) ||
242 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
Tejun Heo93aae172010-12-16 17:52:17 +0100244 if (last_present != cd->media_present)
245 events |= DISK_EVENT_MEDIA_CHANGE;
246skip_tur:
247 if (cd->device->changed) {
248 events |= DISK_EVENT_MEDIA_CHANGE;
249 cd->device->changed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 }
Kay Sievers285e9672007-08-14 14:10:39 +0200251
Tejun Heo93aae172010-12-16 17:52:17 +0100252 return events;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
Tejun Heo93aae172010-12-16 17:52:17 +0100254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255/*
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800256 * sr_done is the interrupt routine for the device driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 *
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800258 * It will be notified on the end of a SCSI read / write, and will take one
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 * of several actions based on success or failure.
260 */
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800261static int sr_done(struct scsi_cmnd *SCpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262{
263 int result = SCpnt->result;
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200264 int this_count = scsi_bufflen(SCpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 int good_bytes = (result == 0 ? this_count : 0);
266 int block_sectors = 0;
267 long error_sector;
268 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
269
270#ifdef DEBUG
271 printk("sr.c done: %x\n", result);
272#endif
273
274 /*
275 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
276 * success. Since this is a relatively rare error condition, no
277 * care is taken to avoid unnecessary additional work such as
278 * memcpy's that could be avoided.
279 */
280 if (driver_byte(result) != 0 && /* An error occurred */
281 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
282 switch (SCpnt->sense_buffer[2]) {
283 case MEDIUM_ERROR:
284 case VOLUME_OVERFLOW:
285 case ILLEGAL_REQUEST:
286 if (!(SCpnt->sense_buffer[0] & 0x90))
287 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 error_sector = (SCpnt->sense_buffer[3] << 24) |
289 (SCpnt->sense_buffer[4] << 16) |
290 (SCpnt->sense_buffer[5] << 8) |
291 SCpnt->sense_buffer[6];
292 if (SCpnt->request->bio != NULL)
293 block_sectors =
294 bio_sectors(SCpnt->request->bio);
295 if (block_sectors < 4)
296 block_sectors = 4;
297 if (cd->device->sector_size == 2048)
298 error_sector <<= 2;
299 error_sector &= ~(block_sectors - 1);
Tejun Heo83096eb2009-05-07 22:24:39 +0900300 good_bytes = (error_sector -
301 blk_rq_pos(SCpnt->request)) << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 if (good_bytes < 0 || good_bytes >= this_count)
303 good_bytes = 0;
304 /*
305 * The SCSI specification allows for the value
306 * returned by READ CAPACITY to be up to 75 2K
307 * sectors past the last readable block.
308 * Therefore, if we hit a medium error within the
309 * last 75 2K sectors, we decrease the saved size
310 * value.
311 */
312 if (error_sector < get_capacity(cd->disk) &&
313 cd->capacity - error_sector < 4 * 75)
314 set_capacity(cd->disk, error_sector);
315 break;
316
317 case RECOVERED_ERROR:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 good_bytes = this_count;
319 break;
320
321 default:
322 break;
323 }
324 }
325
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800326 return good_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327}
328
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500329static int sr_prep_fn(struct request_queue *q, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330{
Jens Axboe242f9dc2008-09-14 05:55:09 -0700331 int block = 0, this_count, s_size;
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500332 struct scsi_cd *cd;
333 struct scsi_cmnd *SCpnt;
334 struct scsi_device *sdp = q->queuedata;
335 int ret;
336
337 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
338 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
339 goto out;
340 } else if (rq->cmd_type != REQ_TYPE_FS) {
341 ret = BLKPREP_KILL;
342 goto out;
343 }
344 ret = scsi_setup_fs_cmnd(sdp, rq);
345 if (ret != BLKPREP_OK)
346 goto out;
347 SCpnt = rq->special;
348 cd = scsi_cd(rq->rq_disk);
349
350 /* from here on until we're complete, any goto out
351 * is used for a killable error condition */
352 ret = BLKPREP_KILL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
354 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n",
355 cd->disk->disk_name, block));
356
357 if (!cd->device || !scsi_device_online(cd->device)) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900358 SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n",
359 blk_rq_sectors(rq)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500361 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 }
363
364 if (cd->device->changed) {
365 /*
366 * quietly refuse to do anything to a changed disc until the
367 * changed bit has been reset
368 */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500369 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 }
371
372 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 * we do lazy blocksize switching (when reading XA sectors,
374 * see CDROMREADMODE2 ioctl)
375 */
376 s_size = cd->device->sector_size;
377 if (s_size > 2048) {
378 if (!in_interrupt())
379 sr_set_blocklength(cd, 2048);
380 else
381 printk("sr: can't switch blocksize: in interrupt\n");
382 }
383
384 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400385 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500386 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 }
388
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500389 if (rq_data_dir(rq) == WRITE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 if (!cd->device->writeable)
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500391 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 SCpnt->cmnd[0] = WRITE_10;
393 SCpnt->sc_data_direction = DMA_TO_DEVICE;
394 cd->cdi.media_written = 1;
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500395 } else if (rq_data_dir(rq) == READ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 SCpnt->cmnd[0] = READ_10;
397 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
398 } else {
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500399 blk_dump_rq_flags(rq, "Unknown sr command");
400 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 }
402
403 {
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200404 struct scatterlist *sg;
405 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200407 scsi_for_each_sg(SCpnt, sg, sg_count, i)
408 size += sg->length;
409
410 if (size != scsi_bufflen(SCpnt)) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400411 scmd_printk(KERN_ERR, SCpnt,
412 "mismatch count %d, bytes %d\n",
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200413 size, scsi_bufflen(SCpnt));
414 if (scsi_bufflen(SCpnt) > size)
415 SCpnt->sdb.length = size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 }
417 }
418
419 /*
420 * request doesn't start on hw block boundary, add scatter pads
421 */
Tejun Heo83096eb2009-05-07 22:24:39 +0900422 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200423 (scsi_bufflen(SCpnt) % s_size)) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -0400424 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500425 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 }
427
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200428 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
430
Tejun Heo83096eb2009-05-07 22:24:39 +0900431 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 cd->cdi.name,
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500433 (rq_data_dir(rq) == WRITE) ?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 "writing" : "reading",
Tejun Heo83096eb2009-05-07 22:24:39 +0900435 this_count, blk_rq_sectors(rq)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
437 SCpnt->cmnd[1] = 0;
Tejun Heo83096eb2009-05-07 22:24:39 +0900438 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
440 if (this_count > 0xffff) {
441 this_count = 0xffff;
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200442 SCpnt->sdb.length = this_count * s_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 }
444
445 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
446 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
447 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
448 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
449 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
450 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
451 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
452
453 /*
454 * We shouldn't disconnect in the middle of a sector, so with a dumb
455 * host adapter, it's safe to assume that we can at least transfer
456 * this many bytes between each connect / disconnect.
457 */
458 SCpnt->transfersize = cd->device->sector_size;
459 SCpnt->underflow = this_count << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 SCpnt->allowed = MAX_RETRIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
462 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 * This indicates that the command is ready from our end to be
464 * queued.
465 */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500466 ret = BLKPREP_OK;
467 out:
468 return scsi_prep_return(q, rq, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469}
470
Al Viro40cc51b2008-03-02 10:41:28 -0500471static int sr_block_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472{
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200473 struct scsi_cd *cd;
Al Viro40cc51b2008-03-02 10:41:28 -0500474 int ret = -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200476 mutex_lock(&sr_mutex);
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200477 cd = scsi_cd_get(bdev->bd_disk);
Al Viro40cc51b2008-03-02 10:41:28 -0500478 if (cd) {
479 ret = cdrom_open(&cd->cdi, bdev, mode);
480 if (ret)
481 scsi_cd_put(cd);
482 }
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200483 mutex_unlock(&sr_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 return ret;
485}
486
Al Viro40cc51b2008-03-02 10:41:28 -0500487static int sr_block_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488{
Al Viro40cc51b2008-03-02 10:41:28 -0500489 struct scsi_cd *cd = scsi_cd(disk);
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200490 mutex_lock(&sr_mutex);
Al Viro40cc51b2008-03-02 10:41:28 -0500491 cdrom_release(&cd->cdi, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 scsi_cd_put(cd);
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200493 mutex_unlock(&sr_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 return 0;
495}
496
Al Viro40cc51b2008-03-02 10:41:28 -0500497static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 unsigned long arg)
499{
Al Viro40cc51b2008-03-02 10:41:28 -0500500 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 struct scsi_device *sdev = cd->device;
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800502 void __user *argp = (void __user *)arg;
503 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200505 mutex_lock(&sr_mutex);
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200506
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800507 /*
508 * Send SCSI addressing ioctls directly to mid level, send other
509 * ioctls to cdrom/block level.
510 */
511 switch (cmd) {
512 case SCSI_IOCTL_GET_IDLUN:
513 case SCSI_IOCTL_GET_BUS_NUMBER:
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200514 ret = scsi_ioctl(sdev, cmd, argp);
515 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 }
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800517
Al Viro40cc51b2008-03-02 10:41:28 -0500518 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
Tejun Heo63972562007-01-02 17:41:04 +0900519 if (ret != -ENOSYS)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200520 goto out;
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800521
522 /*
523 * ENODEV means that we didn't recognise the ioctl, or that we
524 * cannot execute it in the current device state. In either
525 * case fall through to scsi_ioctl, which will return ENDOEV again
526 * if it doesn't recognise the ioctl
527 */
Al Viro83ff6fe2008-03-02 08:15:49 -0500528 ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
Christoph Hellwigfd4ce1a2008-11-05 14:58:42 +0100529 (mode & FMODE_NDELAY) != 0);
Christoph Hellwig6a2900b2006-03-23 03:00:15 -0800530 if (ret != -ENODEV)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200531 goto out;
532 ret = scsi_ioctl(sdev, cmd, argp);
533
534out:
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200535 mutex_unlock(&sr_mutex);
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200536 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537}
538
Tejun Heo93aae172010-12-16 17:52:17 +0100539static unsigned int sr_block_check_events(struct gendisk *disk,
540 unsigned int clearing)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541{
542 struct scsi_cd *cd = scsi_cd(disk);
Tejun Heo93aae172010-12-16 17:52:17 +0100543 return cdrom_check_events(&cd->cdi, clearing);
544}
545
546static int sr_block_revalidate_disk(struct gendisk *disk)
547{
548 struct scsi_cd *cd = scsi_cd(disk);
549 struct scsi_sense_hdr sshdr;
550
551 /* if the unit is not ready, nothing more to do */
552 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
553 return 0;
554
555 sr_cd_check(&cd->cdi);
556 get_sectorsize(cd);
557 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558}
559
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700560static const struct block_device_operations sr_bdops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561{
562 .owner = THIS_MODULE,
Al Viro40cc51b2008-03-02 10:41:28 -0500563 .open = sr_block_open,
564 .release = sr_block_release,
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200565 .ioctl = sr_block_ioctl,
Tejun Heo93aae172010-12-16 17:52:17 +0100566 .check_events = sr_block_check_events,
567 .revalidate_disk = sr_block_revalidate_disk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 /*
569 * No compat_ioctl for now because sr_block_ioctl never
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300570 * seems to pass arbitrary ioctls down to host drivers.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 */
572};
573
574static int sr_open(struct cdrom_device_info *cdi, int purpose)
575{
576 struct scsi_cd *cd = cdi->handle;
577 struct scsi_device *sdev = cd->device;
578 int retval;
579
580 /*
581 * If the device is in error recovery, wait until it is done.
582 * If the device is offline, then disallow any access to it.
583 */
584 retval = -ENXIO;
585 if (!scsi_block_when_processing_errors(sdev))
586 goto error_out;
587
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 return 0;
589
590error_out:
591 return retval;
592}
593
594static void sr_release(struct cdrom_device_info *cdi)
595{
596 struct scsi_cd *cd = cdi->handle;
597
598 if (cd->device->sector_size > 2048)
599 sr_set_blocklength(cd, 2048);
600
601}
602
603static int sr_probe(struct device *dev)
604{
605 struct scsi_device *sdev = to_scsi_device(dev);
606 struct gendisk *disk;
607 struct scsi_cd *cd;
608 int minor, error;
609
610 error = -ENODEV;
611 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
612 goto fail;
613
614 error = -ENOMEM;
Jes Sorensen24669f752006-01-16 10:31:18 -0500615 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 if (!cd)
617 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
619 kref_init(&cd->kref);
620
621 disk = alloc_disk(1);
622 if (!disk)
623 goto fail_free;
624
625 spin_lock(&sr_index_lock);
626 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
627 if (minor == SR_DISKS) {
628 spin_unlock(&sr_index_lock);
629 error = -EBUSY;
630 goto fail_put;
631 }
632 __set_bit(minor, sr_index_bits);
633 spin_unlock(&sr_index_lock);
634
635 disk->major = SCSI_CDROM_MAJOR;
636 disk->first_minor = minor;
637 sprintf(disk->disk_name, "sr%d", minor);
638 disk->fops = &sr_bdops;
639 disk->flags = GENHD_FL_CD;
Tejun Heo93aae172010-12-16 17:52:17 +0100640 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
Jens Axboe242f9dc2008-09-14 05:55:09 -0700642 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
643
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 cd->device = sdev;
645 cd->disk = disk;
646 cd->driver = &sr_template;
647 cd->disk = disk;
648 cd->capacity = 0x1fffff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 cd->device->changed = 1; /* force recheck CD type */
Tejun Heo93aae172010-12-16 17:52:17 +0100650 cd->media_present = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 cd->use = 1;
652 cd->readcd_known = 0;
653 cd->readcd_cdda = 0;
654
655 cd->cdi.ops = &sr_dops;
656 cd->cdi.handle = cd;
657 cd->cdi.mask = 0;
658 cd->cdi.capacity = 1;
659 sprintf(cd->cdi.name, "sr%d", minor);
660
661 sdev->sector_size = 2048; /* A guess, just in case */
662
663 /* FIXME: need to handle a get_capabilities failure properly ?? */
664 get_capabilities(cd);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500665 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 sr_vendor_init(cd);
667
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 disk->driverfs_dev = &sdev->sdev_gendev;
669 set_capacity(disk, cd->capacity);
670 disk->private_data = &cd->driver;
671 disk->queue = sdev->request_queue;
672 cd->cdi.disk = disk;
673
674 if (register_cdrom(&cd->cdi))
675 goto fail_put;
676
677 dev_set_drvdata(dev, cd);
678 disk->flags |= GENHD_FL_REMOVABLE;
679 add_disk(disk);
680
James Bottomley9ccfc752005-10-02 11:45:08 -0500681 sdev_printk(KERN_DEBUG, sdev,
682 "Attached scsi CD-ROM %s\n", cd->cdi.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 return 0;
684
685fail_put:
686 put_disk(disk);
687fail_free:
688 kfree(cd);
689fail:
690 return error;
691}
692
693
694static void get_sectorsize(struct scsi_cd *cd)
695{
696 unsigned char cmd[10];
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200697 unsigned char buffer[8];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 int the_result, retries = 3;
699 int sector_size;
Jens Axboe165125e2007-07-24 09:28:11 +0200700 struct request_queue *queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 do {
703 cmd[0] = READ_CAPACITY;
704 memset((void *) &cmd[1], 0, 9);
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200705 memset(buffer, 0, sizeof(buffer));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706
707 /* Do the command and wait.. */
James Bottomley820732b2005-06-12 22:21:29 -0500708 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200709 buffer, sizeof(buffer), NULL,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900710 SR_TIMEOUT, MAX_RETRIES, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 retries--;
713
714 } while (the_result && retries);
715
716
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 if (the_result) {
718 cd->capacity = 0x1fffff;
719 sector_size = 2048; /* A guess, just in case */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 } else {
Tejun Heo59151362009-09-04 11:38:02 +0900721 long last_written;
722
723 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) |
724 (buffer[2] << 8) | buffer[3]);
725 /*
726 * READ_CAPACITY doesn't return the correct size on
727 * certain UDF media. If last_written is larger, use
728 * it instead.
729 *
730 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
731 */
732 if (!cdrom_get_last_written(&cd->cdi, &last_written))
733 cd->capacity = max_t(long, cd->capacity, last_written);
734
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 sector_size = (buffer[4] << 24) |
736 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
737 switch (sector_size) {
738 /*
739 * HP 4020i CD-Recorder reports 2340 byte sectors
740 * Philips CD-Writers report 2352 byte sectors
741 *
742 * Use 2k sectors for them..
743 */
744 case 0:
745 case 2340:
746 case 2352:
747 sector_size = 2048;
748 /* fall through */
749 case 2048:
750 cd->capacity *= 4;
751 /* fall through */
752 case 512:
753 break;
754 default:
755 printk("%s: unsupported sector size %d.\n",
756 cd->cdi.name, sector_size);
757 cd->capacity = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 }
759
760 cd->device->sector_size = sector_size;
761
762 /*
763 * Add this so that we have the ability to correctly gauge
764 * what the device is capable of.
765 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 set_capacity(cd->disk, cd->capacity);
767 }
768
769 queue = cd->device->request_queue;
Martin K. Petersene1defc42009-05-22 17:17:49 -0400770 blk_queue_logical_block_size(queue, sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
FUJITA Tomonori62858da2008-07-04 09:31:50 +0200772 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773}
774
775static void get_capabilities(struct scsi_cd *cd)
776{
777 unsigned char *buffer;
778 struct scsi_mode_data data;
James Bottomley820732b2005-06-12 22:21:29 -0500779 struct scsi_sense_hdr sshdr;
James Bottomley38582a62008-02-06 13:01:58 -0600780 int rc, n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
Arjan van de Ven0ad78202005-11-28 16:22:25 +0100782 static const char *loadmech[] =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 {
784 "caddy",
785 "tray",
786 "pop-up",
787 "",
788 "changer",
789 "cartridge changer",
790 "",
791 ""
792 };
793
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794
795 /* allocate transfer buffer */
796 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
797 if (!buffer) {
798 printk(KERN_ERR "sr: out of memory.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 return;
800 }
801
James Bottomley38582a62008-02-06 13:01:58 -0600802 /* eat unit attentions */
Tejun Heo9f8a2c22010-12-08 20:57:40 +0100803 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804
805 /* ask for mode page 0x2a */
806 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
James Bottomley1cf72692005-08-28 11:27:01 -0500807 SR_TIMEOUT, 3, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808
809 if (!scsi_status_is_good(rc)) {
810 /* failed, drive doesn't have capabilities mode page */
811 cd->cdi.speed = 1;
812 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
Chuck Ebbertbcc1e382006-01-11 23:58:40 -0500813 CDC_DVD | CDC_DVD_RAM |
814 CDC_SELECT_DISC | CDC_SELECT_SPEED |
815 CDC_MRW | CDC_MRW_W | CDC_RAM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 kfree(buffer);
817 printk("%s: scsi-1 drive\n", cd->cdi.name);
818 return;
819 }
820
821 n = data.header_length + data.block_descriptor_length;
822 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
823 cd->readcd_known = 1;
824 cd->readcd_cdda = buffer[n + 5] & 0x01;
825 /* print some capability bits */
826 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name,
827 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
828 cd->cdi.speed,
829 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
830 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
831 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
832 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
833 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
834 loadmech[buffer[n + 6] >> 5]);
835 if ((buffer[n + 6] >> 5) == 0)
836 /* caddy drives can't close tray... */
837 cd->cdi.mask |= CDC_CLOSE_TRAY;
838 if ((buffer[n + 2] & 0x8) == 0)
839 /* not a DVD drive */
840 cd->cdi.mask |= CDC_DVD;
841 if ((buffer[n + 3] & 0x20) == 0)
842 /* can't write DVD-RAM media */
843 cd->cdi.mask |= CDC_DVD_RAM;
844 if ((buffer[n + 3] & 0x10) == 0)
845 /* can't write DVD-R media */
846 cd->cdi.mask |= CDC_DVD_R;
847 if ((buffer[n + 3] & 0x2) == 0)
848 /* can't write CD-RW media */
849 cd->cdi.mask |= CDC_CD_RW;
850 if ((buffer[n + 3] & 0x1) == 0)
851 /* can't write CD-R media */
852 cd->cdi.mask |= CDC_CD_R;
853 if ((buffer[n + 6] & 0x8) == 0)
854 /* can't eject */
855 cd->cdi.mask |= CDC_OPEN_TRAY;
856
857 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
858 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
859 cd->cdi.capacity =
860 cdrom_number_of_slots(&cd->cdi);
861 if (cd->cdi.capacity <= 1)
862 /* not a changer */
863 cd->cdi.mask |= CDC_SELECT_DISC;
864 /*else I don't think it can close its tray
865 cd->cdi.mask |= CDC_CLOSE_TRAY; */
866
867 /*
868 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
869 */
870 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
871 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
872 cd->device->writeable = 1;
873 }
874
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 kfree(buffer);
876}
877
878/*
879 * sr_packet() is the entry point for the generic commands generated
880 * by the Uniform CD-ROM layer.
881 */
882static int sr_packet(struct cdrom_device_info *cdi,
883 struct packet_command *cgc)
884{
Hans de Goede8e04d802010-10-01 14:20:08 -0700885 struct scsi_cd *cd = cdi->handle;
886 struct scsi_device *sdev = cd->device;
887
888 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
889 return -EDRIVE_CANT_DO_THIS;
890
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 if (cgc->timeout <= 0)
892 cgc->timeout = IOCTL_TIMEOUT;
893
Hans de Goede8e04d802010-10-01 14:20:08 -0700894 sr_do_ioctl(cd, cgc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895
896 return cgc->stat;
897}
898
899/**
900 * sr_kref_release - Called to free the scsi_cd structure
901 * @kref: pointer to embedded kref
902 *
Arjan van de Ven0b950672006-01-11 13:16:10 +0100903 * sr_ref_mutex must be held entering this routine. Because it is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 * called on last put, you should always use the scsi_cd_get()
905 * scsi_cd_put() helpers which manipulate the semaphore directly
906 * and never do a direct kref_put().
907 **/
908static void sr_kref_release(struct kref *kref)
909{
910 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
911 struct gendisk *disk = cd->disk;
912
913 spin_lock(&sr_index_lock);
Tejun Heof331c022008-09-03 09:01:48 +0200914 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 spin_unlock(&sr_index_lock);
916
917 unregister_cdrom(&cd->cdi);
918
919 disk->private_data = NULL;
920
921 put_disk(disk);
922
923 kfree(cd);
924}
925
926static int sr_remove(struct device *dev)
927{
928 struct scsi_cd *cd = dev_get_drvdata(dev);
929
Hannes Reineckeb3912772009-06-18 09:57:18 +0200930 blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 del_gendisk(cd->disk);
932
Arjan van de Ven0b950672006-01-11 13:16:10 +0100933 mutex_lock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 kref_put(&cd->kref, sr_kref_release);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100935 mutex_unlock(&sr_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936
937 return 0;
938}
939
940static int __init init_sr(void)
941{
942 int rc;
943
944 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
945 if (rc)
946 return rc;
Akinobu Mitada3962f2007-06-26 00:39:33 +0900947 rc = scsi_register_driver(&sr_template.gendrv);
948 if (rc)
949 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
950
951 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952}
953
954static void __exit exit_sr(void)
955{
956 scsi_unregister_driver(&sr_template.gendrv);
957 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
958}
959
960module_init(init_sr);
961module_exit(exit_sr);
962MODULE_LICENSE("GPL");