2 * sr.c Copyright (C) 1992 David Giller
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
6 * sd.c Copyright (C) 1992 Drew Eckhardt
7 * Linux scsi disk driver by
8 * Drew Eckhardt <drew@colorado.edu>
10 * Modified by Eric Youngdale ericy@andante.org to
11 * add scatter-gather, multiple outstanding request, and other
14 * Modified by Eric Youngdale eric@andante.org to support loadable
15 * low-level scsi drivers.
17 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
20 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
21 * generic cdrom interface
23 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
24 * interface, capabilities probe additions, ioctl cleanups, etc.
26 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
28 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
29 * transparently and lose the GHOST hack
31 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
32 * check resource allocation in sr_init and some cleanups
35 #include <linux/module.h>
37 #include <linux/kernel.h>
39 #include <linux/bio.h>
40 #include <linux/string.h>
41 #include <linux/errno.h>
42 #include <linux/cdrom.h>
43 #include <linux/interrupt.h>
44 #include <linux/init.h>
45 #include <linux/blkdev.h>
46 #include <linux/mutex.h>
47 #include <asm/uaccess.h>
49 #include <scsi/scsi.h>
50 #include <scsi/scsi_dbg.h>
51 #include <scsi/scsi_device.h>
52 #include <scsi/scsi_driver.h>
53 #include <scsi/scsi_cmnd.h>
54 #include <scsi/scsi_eh.h>
55 #include <scsi/scsi_host.h>
56 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
58 #include "scsi_logging.h"
62 MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
63 MODULE_LICENSE("GPL");
64 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
65 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
66 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
70 #define SR_CAPABILITIES \
71 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
72 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
73 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
74 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
75 CDC_MRW|CDC_MRW_W|CDC_RAM)
77 static int sr_probe(struct device *);
78 static int sr_remove(struct device *);
79 static int sr_done(struct scsi_cmnd *);
81 static struct scsi_driver sr_template = {
91 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
92 static DEFINE_SPINLOCK(sr_index_lock);
94 /* This semaphore is used to mediate the 0->1 reference get in the
95 * face of object destruction (i.e. we can't allow a get on an
96 * object after last put) */
97 static DEFINE_MUTEX(sr_ref_mutex);
99 static int sr_open(struct cdrom_device_info *, int);
100 static void sr_release(struct cdrom_device_info *);
102 static void get_sectorsize(struct scsi_cd *);
103 static void get_capabilities(struct scsi_cd *);
105 static int sr_media_change(struct cdrom_device_info *, int);
106 static int sr_packet(struct cdrom_device_info *, struct packet_command *);
108 static struct cdrom_device_ops sr_dops = {
110 .release = sr_release,
111 .drive_status = sr_drive_status,
112 .media_changed = sr_media_change,
113 .tray_move = sr_tray_move,
114 .lock_door = sr_lock_door,
115 .select_speed = sr_select_speed,
116 .get_last_session = sr_get_last_session,
117 .get_mcn = sr_get_mcn,
119 .audio_ioctl = sr_audio_ioctl,
120 .capability = SR_CAPABILITIES,
121 .generic_packet = sr_packet,
124 static void sr_kref_release(struct kref *kref);
126 static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
128 return container_of(disk->private_data, struct scsi_cd, driver);
132 * The get and put routines for the struct scsi_cd. Note this entity
133 * has a scsi_device pointer and owns a reference to this.
135 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
137 struct scsi_cd *cd = NULL;
139 mutex_lock(&sr_ref_mutex);
140 if (disk->private_data == NULL)
144 if (scsi_device_get(cd->device))
149 kref_put(&cd->kref, sr_kref_release);
152 mutex_unlock(&sr_ref_mutex);
156 static void scsi_cd_put(struct scsi_cd *cd)
158 struct scsi_device *sdev = cd->device;
160 mutex_lock(&sr_ref_mutex);
161 kref_put(&cd->kref, sr_kref_release);
162 scsi_device_put(sdev);
163 mutex_unlock(&sr_ref_mutex);
166 /* identical to scsi_test_unit_ready except that it doesn't
167 * eat the NOT_READY returns for removable media */
168 int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr)
170 int retries = MAX_RETRIES;
172 u8 cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0 };
174 /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION
175 * conditions are gone, or a timeout happens
178 the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL,
179 0, sshdr, SR_TIMEOUT,
181 if (scsi_sense_valid(sshdr) &&
182 sshdr->sense_key == UNIT_ATTENTION)
185 } while (retries > 0 &&
186 (!scsi_status_is_good(the_result) ||
187 (scsi_sense_valid(sshdr) &&
188 sshdr->sense_key == UNIT_ATTENTION)));
193 * This function checks to see if the media has been changed in the
194 * CDROM drive. It is possible that we have already sensed a change,
195 * or the drive may have sensed one and not yet reported it. We must
196 * be ready for either case. This function always reports the current
197 * value of the changed bit. If flag is 0, then the changed bit is reset.
198 * This function could be done as an ioctl, but we would need to have
199 * an inode for that to work, and we do not always have one.
202 static int sr_media_change(struct cdrom_device_info *cdi, int slot)
204 struct scsi_cd *cd = cdi->handle;
206 struct scsi_sense_hdr *sshdr;
208 if (CDSL_CURRENT != slot) {
209 /* no changer support */
213 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
214 retval = sr_test_unit_ready(cd->device, sshdr);
215 if (retval || (scsi_sense_valid(sshdr) &&
216 /* 0x3a is medium not present */
217 sshdr->asc == 0x3a)) {
218 /* Media not present or unable to test, unit probably not
219 * ready. This usually means there is no disc in the drive.
220 * Mark as changed, and we will figure it out later once
221 * the drive is available again.
223 cd->device->changed = 1;
224 /* This will force a flush, if called from check_disk_change */
229 retval = cd->device->changed;
230 cd->device->changed = 0;
231 /* If the disk changed, the capacity will now be different,
232 * so we force a re-read of this information */
234 /* check multisession offset etc */
240 /* Notify userspace, that media has changed. */
241 if (retval != cd->previous_state)
242 sdev_evt_send_simple(cd->device, SDEV_EVT_MEDIA_CHANGE,
244 cd->previous_state = retval;
251 * sr_done is the interrupt routine for the device driver.
253 * It will be notified on the end of a SCSI read / write, and will take one
254 * of several actions based on success or failure.
256 static int sr_done(struct scsi_cmnd *SCpnt)
258 int result = SCpnt->result;
259 int this_count = scsi_bufflen(SCpnt);
260 int good_bytes = (result == 0 ? this_count : 0);
261 int block_sectors = 0;
263 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
266 printk("sr.c done: %x\n", result);
270 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
271 * success. Since this is a relatively rare error condition, no
272 * care is taken to avoid unnecessary additional work such as
273 * memcpy's that could be avoided.
275 if (driver_byte(result) != 0 && /* An error occurred */
276 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
277 switch (SCpnt->sense_buffer[2]) {
279 case VOLUME_OVERFLOW:
280 case ILLEGAL_REQUEST:
281 if (!(SCpnt->sense_buffer[0] & 0x90))
283 error_sector = (SCpnt->sense_buffer[3] << 24) |
284 (SCpnt->sense_buffer[4] << 16) |
285 (SCpnt->sense_buffer[5] << 8) |
286 SCpnt->sense_buffer[6];
287 if (SCpnt->request->bio != NULL)
289 bio_sectors(SCpnt->request->bio);
290 if (block_sectors < 4)
292 if (cd->device->sector_size == 2048)
294 error_sector &= ~(block_sectors - 1);
295 good_bytes = (error_sector - SCpnt->request->sector) << 9;
296 if (good_bytes < 0 || good_bytes >= this_count)
299 * The SCSI specification allows for the value
300 * returned by READ CAPACITY to be up to 75 2K
301 * sectors past the last readable block.
302 * Therefore, if we hit a medium error within the
303 * last 75 2K sectors, we decrease the saved size
306 if (error_sector < get_capacity(cd->disk) &&
307 cd->capacity - error_sector < 4 * 75)
308 set_capacity(cd->disk, error_sector);
311 case RECOVERED_ERROR:
314 * An error occured, but it recovered. Inform the
315 * user, but make sure that it's not treated as a
318 scsi_print_sense("sr", SCpnt);
320 SCpnt->sense_buffer[0] = 0x0;
321 good_bytes = this_count;
332 static int sr_prep_fn(struct request_queue *q, struct request *rq)
334 int block = 0, this_count, s_size;
336 struct scsi_cmnd *SCpnt;
337 struct scsi_device *sdp = q->queuedata;
340 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
341 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
343 } else if (rq->cmd_type != REQ_TYPE_FS) {
347 ret = scsi_setup_fs_cmnd(sdp, rq);
348 if (ret != BLKPREP_OK)
351 cd = scsi_cd(rq->rq_disk);
353 /* from here on until we're complete, any goto out
354 * is used for a killable error condition */
357 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n",
358 cd->disk->disk_name, block));
360 if (!cd->device || !scsi_device_online(cd->device)) {
361 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
363 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
367 if (cd->device->changed) {
369 * quietly refuse to do anything to a changed disc until the
370 * changed bit has been reset
376 * we do lazy blocksize switching (when reading XA sectors,
377 * see CDROMREADMODE2 ioctl)
379 s_size = cd->device->sector_size;
382 sr_set_blocklength(cd, 2048);
384 printk("sr: can't switch blocksize: in interrupt\n");
387 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
388 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
392 if (rq_data_dir(rq) == WRITE) {
393 if (!cd->device->writeable)
395 SCpnt->cmnd[0] = WRITE_10;
396 SCpnt->sc_data_direction = DMA_TO_DEVICE;
397 cd->cdi.media_written = 1;
398 } else if (rq_data_dir(rq) == READ) {
399 SCpnt->cmnd[0] = READ_10;
400 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
402 blk_dump_rq_flags(rq, "Unknown sr command");
407 struct scatterlist *sg;
408 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
410 scsi_for_each_sg(SCpnt, sg, sg_count, i)
413 if (size != scsi_bufflen(SCpnt)) {
414 scmd_printk(KERN_ERR, SCpnt,
415 "mismatch count %d, bytes %d\n",
416 size, scsi_bufflen(SCpnt));
417 if (scsi_bufflen(SCpnt) > size)
418 SCpnt->sdb.length = size;
423 * request doesn't start on hw block boundary, add scatter pads
425 if (((unsigned int)rq->sector % (s_size >> 9)) ||
426 (scsi_bufflen(SCpnt) % s_size)) {
427 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
431 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
434 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
436 (rq_data_dir(rq) == WRITE) ?
437 "writing" : "reading",
438 this_count, rq->nr_sectors));
441 block = (unsigned int)rq->sector / (s_size >> 9);
443 if (this_count > 0xffff) {
445 SCpnt->sdb.length = this_count * s_size;
448 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
449 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
450 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
451 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
452 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
453 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
454 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
457 * We shouldn't disconnect in the middle of a sector, so with a dumb
458 * host adapter, it's safe to assume that we can at least transfer
459 * this many bytes between each connect / disconnect.
461 SCpnt->transfersize = cd->device->sector_size;
462 SCpnt->underflow = this_count << 9;
463 SCpnt->allowed = MAX_RETRIES;
466 * This indicates that the command is ready from our end to be
471 return scsi_prep_return(q, rq, ret);
474 static int sr_block_open(struct block_device *bdev, fmode_t mode)
476 struct scsi_cd *cd = scsi_cd_get(bdev->bd_disk);
480 ret = cdrom_open(&cd->cdi, bdev, mode);
487 static int sr_block_release(struct gendisk *disk, fmode_t mode)
489 struct scsi_cd *cd = scsi_cd(disk);
490 cdrom_release(&cd->cdi, mode);
495 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
498 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
499 struct scsi_device *sdev = cd->device;
500 void __user *argp = (void __user *)arg;
504 * Send SCSI addressing ioctls directly to mid level, send other
505 * ioctls to cdrom/block level.
508 case SCSI_IOCTL_GET_IDLUN:
509 case SCSI_IOCTL_GET_BUS_NUMBER:
510 return scsi_ioctl(sdev, cmd, argp);
513 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
518 * ENODEV means that we didn't recognise the ioctl, or that we
519 * cannot execute it in the current device state. In either
520 * case fall through to scsi_ioctl, which will return ENDOEV again
521 * if it doesn't recognise the ioctl
523 ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
524 (mode & FMODE_NDELAY) != 0);
527 return scsi_ioctl(sdev, cmd, argp);
530 static int sr_block_media_changed(struct gendisk *disk)
532 struct scsi_cd *cd = scsi_cd(disk);
533 return cdrom_media_changed(&cd->cdi);
536 static struct block_device_operations sr_bdops =
538 .owner = THIS_MODULE,
539 .open = sr_block_open,
540 .release = sr_block_release,
541 .locked_ioctl = sr_block_ioctl,
542 .media_changed = sr_block_media_changed,
544 * No compat_ioctl for now because sr_block_ioctl never
545 * seems to pass arbitary ioctls down to host drivers.
549 static int sr_open(struct cdrom_device_info *cdi, int purpose)
551 struct scsi_cd *cd = cdi->handle;
552 struct scsi_device *sdev = cd->device;
556 * If the device is in error recovery, wait until it is done.
557 * If the device is offline, then disallow any access to it.
560 if (!scsi_block_when_processing_errors(sdev))
569 static void sr_release(struct cdrom_device_info *cdi)
571 struct scsi_cd *cd = cdi->handle;
573 if (cd->device->sector_size > 2048)
574 sr_set_blocklength(cd, 2048);
578 static int sr_probe(struct device *dev)
580 struct scsi_device *sdev = to_scsi_device(dev);
581 struct gendisk *disk;
586 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
590 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
594 kref_init(&cd->kref);
596 disk = alloc_disk(1);
600 spin_lock(&sr_index_lock);
601 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
602 if (minor == SR_DISKS) {
603 spin_unlock(&sr_index_lock);
607 __set_bit(minor, sr_index_bits);
608 spin_unlock(&sr_index_lock);
610 disk->major = SCSI_CDROM_MAJOR;
611 disk->first_minor = minor;
612 sprintf(disk->disk_name, "sr%d", minor);
613 disk->fops = &sr_bdops;
614 disk->flags = GENHD_FL_CD;
616 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
620 cd->driver = &sr_template;
622 cd->capacity = 0x1fffff;
623 cd->device->changed = 1; /* force recheck CD type */
624 cd->previous_state = 1;
626 cd->readcd_known = 0;
629 cd->cdi.ops = &sr_dops;
632 cd->cdi.capacity = 1;
633 sprintf(cd->cdi.name, "sr%d", minor);
635 sdev->sector_size = 2048; /* A guess, just in case */
637 /* FIXME: need to handle a get_capabilities failure properly ?? */
638 get_capabilities(cd);
639 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn);
642 disk->driverfs_dev = &sdev->sdev_gendev;
643 set_capacity(disk, cd->capacity);
644 disk->private_data = &cd->driver;
645 disk->queue = sdev->request_queue;
648 if (register_cdrom(&cd->cdi))
651 dev_set_drvdata(dev, cd);
652 disk->flags |= GENHD_FL_REMOVABLE;
655 sdev_printk(KERN_DEBUG, sdev,
656 "Attached scsi CD-ROM %s\n", cd->cdi.name);
668 static void get_sectorsize(struct scsi_cd *cd)
670 unsigned char cmd[10];
671 unsigned char buffer[8];
672 int the_result, retries = 3;
674 struct request_queue *queue;
677 cmd[0] = READ_CAPACITY;
678 memset((void *) &cmd[1], 0, 9);
679 memset(buffer, 0, sizeof(buffer));
681 /* Do the command and wait.. */
682 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
683 buffer, sizeof(buffer), NULL,
684 SR_TIMEOUT, MAX_RETRIES, NULL);
688 } while (the_result && retries);
692 cd->capacity = 0x1fffff;
693 sector_size = 2048; /* A guess, just in case */
696 if (cdrom_get_last_written(&cd->cdi,
699 cd->capacity = 1 + ((buffer[0] << 24) |
703 sector_size = (buffer[4] << 24) |
704 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
705 switch (sector_size) {
707 * HP 4020i CD-Recorder reports 2340 byte sectors
708 * Philips CD-Writers report 2352 byte sectors
710 * Use 2k sectors for them..
723 printk("%s: unsupported sector size %d.\n",
724 cd->cdi.name, sector_size);
728 cd->device->sector_size = sector_size;
731 * Add this so that we have the ability to correctly gauge
732 * what the device is capable of.
734 set_capacity(cd->disk, cd->capacity);
737 queue = cd->device->request_queue;
738 blk_queue_hardsect_size(queue, sector_size);
743 static void get_capabilities(struct scsi_cd *cd)
745 unsigned char *buffer;
746 struct scsi_mode_data data;
747 struct scsi_sense_hdr sshdr;
750 static const char *loadmech[] =
763 /* allocate transfer buffer */
764 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
766 printk(KERN_ERR "sr: out of memory.\n");
770 /* eat unit attentions */
771 sr_test_unit_ready(cd->device, &sshdr);
773 /* ask for mode page 0x2a */
774 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
775 SR_TIMEOUT, 3, &data, NULL);
777 if (!scsi_status_is_good(rc)) {
778 /* failed, drive doesn't have capabilities mode page */
780 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
781 CDC_DVD | CDC_DVD_RAM |
782 CDC_SELECT_DISC | CDC_SELECT_SPEED |
783 CDC_MRW | CDC_MRW_W | CDC_RAM);
785 printk("%s: scsi-1 drive\n", cd->cdi.name);
789 n = data.header_length + data.block_descriptor_length;
790 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
791 cd->readcd_known = 1;
792 cd->readcd_cdda = buffer[n + 5] & 0x01;
793 /* print some capability bits */
794 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name,
795 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
797 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
798 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
799 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
800 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
801 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
802 loadmech[buffer[n + 6] >> 5]);
803 if ((buffer[n + 6] >> 5) == 0)
804 /* caddy drives can't close tray... */
805 cd->cdi.mask |= CDC_CLOSE_TRAY;
806 if ((buffer[n + 2] & 0x8) == 0)
807 /* not a DVD drive */
808 cd->cdi.mask |= CDC_DVD;
809 if ((buffer[n + 3] & 0x20) == 0)
810 /* can't write DVD-RAM media */
811 cd->cdi.mask |= CDC_DVD_RAM;
812 if ((buffer[n + 3] & 0x10) == 0)
813 /* can't write DVD-R media */
814 cd->cdi.mask |= CDC_DVD_R;
815 if ((buffer[n + 3] & 0x2) == 0)
816 /* can't write CD-RW media */
817 cd->cdi.mask |= CDC_CD_RW;
818 if ((buffer[n + 3] & 0x1) == 0)
819 /* can't write CD-R media */
820 cd->cdi.mask |= CDC_CD_R;
821 if ((buffer[n + 6] & 0x8) == 0)
823 cd->cdi.mask |= CDC_OPEN_TRAY;
825 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
826 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
828 cdrom_number_of_slots(&cd->cdi);
829 if (cd->cdi.capacity <= 1)
831 cd->cdi.mask |= CDC_SELECT_DISC;
832 /*else I don't think it can close its tray
833 cd->cdi.mask |= CDC_CLOSE_TRAY; */
836 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
838 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
839 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
840 cd->device->writeable = 1;
847 * sr_packet() is the entry point for the generic commands generated
848 * by the Uniform CD-ROM layer.
850 static int sr_packet(struct cdrom_device_info *cdi,
851 struct packet_command *cgc)
853 if (cgc->timeout <= 0)
854 cgc->timeout = IOCTL_TIMEOUT;
856 sr_do_ioctl(cdi->handle, cgc);
862 * sr_kref_release - Called to free the scsi_cd structure
863 * @kref: pointer to embedded kref
865 * sr_ref_mutex must be held entering this routine. Because it is
866 * called on last put, you should always use the scsi_cd_get()
867 * scsi_cd_put() helpers which manipulate the semaphore directly
868 * and never do a direct kref_put().
870 static void sr_kref_release(struct kref *kref)
872 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
873 struct gendisk *disk = cd->disk;
875 spin_lock(&sr_index_lock);
876 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
877 spin_unlock(&sr_index_lock);
879 unregister_cdrom(&cd->cdi);
881 disk->private_data = NULL;
888 static int sr_remove(struct device *dev)
890 struct scsi_cd *cd = dev_get_drvdata(dev);
892 del_gendisk(cd->disk);
894 mutex_lock(&sr_ref_mutex);
895 kref_put(&cd->kref, sr_kref_release);
896 mutex_unlock(&sr_ref_mutex);
901 static int __init init_sr(void)
905 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
908 rc = scsi_register_driver(&sr_template.gendrv);
910 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
915 static void __exit exit_sr(void)
917 scsi_unregister_driver(&sr_template.gendrv);
918 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
921 module_init(init_sr);
922 module_exit(exit_sr);
923 MODULE_LICENSE("GPL");