1 /* 2 * sr.c Copyright (C) 1992 David Giller 3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 4 * 5 * adapted from: 6 * sd.c Copyright (C) 1992 Drew Eckhardt 7 * Linux scsi disk driver by 8 * Drew Eckhardt <drew@colorado.edu> 9 * 10 * Modified by Eric Youngdale ericy@andante.org to 11 * add scatter-gather, multiple outstanding request, and other 12 * enhancements. 13 * 14 * Modified by Eric Youngdale eric@andante.org to support loadable 15 * low-level scsi drivers. 16 * 17 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to 18 * provide auto-eject. 19 * 20 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the 21 * generic cdrom interface 22 * 23 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet() 24 * interface, capabilities probe additions, ioctl cleanups, etc. 25 * 26 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs 27 * 28 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM 29 * transparently and lose the GHOST hack 30 * 31 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br> 32 * check resource allocation in sr_init and some cleanups 33 */ 34 35 #include <linux/module.h> 36 #include <linux/fs.h> 37 #include <linux/kernel.h> 38 #include <linux/mm.h> 39 #include <linux/bio.h> 40 #include <linux/string.h> 41 #include <linux/errno.h> 42 #include <linux/cdrom.h> 43 #include <linux/interrupt.h> 44 #include <linux/init.h> 45 #include <linux/blkdev.h> 46 #include <linux/mutex.h> 47 #include <linux/slab.h> 48 #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> 54 #include <scsi/scsi_cmnd.h> 55 #include <scsi/scsi_eh.h> 56 #include <scsi/scsi_host.h> 57 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ 58 59 #include "scsi_logging.h" 60 #include "sr.h" 61 62 63 MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 64 MODULE_LICENSE("GPL"); 65 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 66 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 67 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); 68 69 #define SR_DISKS 256 70 71 #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| \ 74 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ 75 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 78 static int sr_probe(struct device *); 79 static int sr_remove(struct device *); 80 static int sr_done(struct scsi_cmnd *); 81 82 static struct scsi_driver sr_template = { 83 .owner = THIS_MODULE, 84 .gendrv = { 85 .name = "sr", 86 .probe = sr_probe, 87 .remove = sr_remove, 88 }, 89 .done = sr_done, 90 }; 91 92 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 93 static DEFINE_SPINLOCK(sr_index_lock); 94 95 /* This semaphore is used to mediate the 0->1 reference get in the 96 * face of object destruction (i.e. we can't allow a get on an 97 * object after last put) */ 98 static DEFINE_MUTEX(sr_ref_mutex); 99 100 static int sr_open(struct cdrom_device_info *, int); 101 static void sr_release(struct cdrom_device_info *); 102 103 static void get_sectorsize(struct scsi_cd *); 104 static void get_capabilities(struct scsi_cd *); 105 106 static int sr_media_change(struct cdrom_device_info *, int); 107 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 108 109 static struct cdrom_device_ops sr_dops = { 110 .open = sr_open, 111 .release = sr_release, 112 .drive_status = sr_drive_status, 113 .media_changed = sr_media_change, 114 .tray_move = sr_tray_move, 115 .lock_door = sr_lock_door, 116 .select_speed = sr_select_speed, 117 .get_last_session = sr_get_last_session, 118 .get_mcn = sr_get_mcn, 119 .reset = sr_reset, 120 .audio_ioctl = sr_audio_ioctl, 121 .capability = SR_CAPABILITIES, 122 .generic_packet = sr_packet, 123 }; 124 125 static void sr_kref_release(struct kref *kref); 126 127 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 128 { 129 return container_of(disk->private_data, struct scsi_cd, driver); 130 } 131 132 /* 133 * The get and put routines for the struct scsi_cd. Note this entity 134 * has a scsi_device pointer and owns a reference to this. 135 */ 136 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 137 { 138 struct scsi_cd *cd = NULL; 139 140 mutex_lock(&sr_ref_mutex); 141 if (disk->private_data == NULL) 142 goto out; 143 cd = scsi_cd(disk); 144 kref_get(&cd->kref); 145 if (scsi_device_get(cd->device)) 146 goto out_put; 147 goto out; 148 149 out_put: 150 kref_put(&cd->kref, sr_kref_release); 151 cd = NULL; 152 out: 153 mutex_unlock(&sr_ref_mutex); 154 return cd; 155 } 156 157 static void scsi_cd_put(struct scsi_cd *cd) 158 { 159 struct scsi_device *sdev = cd->device; 160 161 mutex_lock(&sr_ref_mutex); 162 kref_put(&cd->kref, sr_kref_release); 163 scsi_device_put(sdev); 164 mutex_unlock(&sr_ref_mutex); 165 } 166 167 /* identical to scsi_test_unit_ready except that it doesn't 168 * eat the NOT_READY returns for removable media */ 169 int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr) 170 { 171 int retries = MAX_RETRIES; 172 int the_result; 173 u8 cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0 }; 174 175 /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION 176 * conditions are gone, or a timeout happens 177 */ 178 do { 179 the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 180 0, sshdr, SR_TIMEOUT, 181 retries--, NULL); 182 if (scsi_sense_valid(sshdr) && 183 sshdr->sense_key == UNIT_ATTENTION) 184 sdev->changed = 1; 185 186 } while (retries > 0 && 187 (!scsi_status_is_good(the_result) || 188 (scsi_sense_valid(sshdr) && 189 sshdr->sense_key == UNIT_ATTENTION))); 190 return the_result; 191 } 192 193 /* 194 * This function checks to see if the media has been changed in the 195 * CDROM drive. It is possible that we have already sensed a change, 196 * or the drive may have sensed one and not yet reported it. We must 197 * be ready for either case. This function always reports the current 198 * value of the changed bit. If flag is 0, then the changed bit is reset. 199 * This function could be done as an ioctl, but we would need to have 200 * an inode for that to work, and we do not always have one. 201 */ 202 203 static int sr_media_change(struct cdrom_device_info *cdi, int slot) 204 { 205 struct scsi_cd *cd = cdi->handle; 206 int retval; 207 struct scsi_sense_hdr *sshdr; 208 209 if (CDSL_CURRENT != slot) { 210 /* no changer support */ 211 return -EINVAL; 212 } 213 214 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 215 retval = sr_test_unit_ready(cd->device, sshdr); 216 if (retval || (scsi_sense_valid(sshdr) && 217 /* 0x3a is medium not present */ 218 sshdr->asc == 0x3a)) { 219 /* Media not present or unable to test, unit probably not 220 * ready. This usually means there is no disc in the drive. 221 * Mark as changed, and we will figure it out later once 222 * the drive is available again. 223 */ 224 cd->device->changed = 1; 225 /* This will force a flush, if called from check_disk_change */ 226 retval = 1; 227 goto out; 228 }; 229 230 retval = cd->device->changed; 231 cd->device->changed = 0; 232 /* If the disk changed, the capacity will now be different, 233 * so we force a re-read of this information */ 234 if (retval) { 235 /* check multisession offset etc */ 236 sr_cd_check(cdi); 237 get_sectorsize(cd); 238 } 239 240 out: 241 /* Notify userspace, that media has changed. */ 242 if (retval != cd->previous_state) 243 sdev_evt_send_simple(cd->device, SDEV_EVT_MEDIA_CHANGE, 244 GFP_KERNEL); 245 cd->previous_state = retval; 246 kfree(sshdr); 247 248 return retval; 249 } 250 251 /* 252 * sr_done is the interrupt routine for the device driver. 253 * 254 * It will be notified on the end of a SCSI read / write, and will take one 255 * of several actions based on success or failure. 256 */ 257 static int sr_done(struct scsi_cmnd *SCpnt) 258 { 259 int result = SCpnt->result; 260 int this_count = scsi_bufflen(SCpnt); 261 int good_bytes = (result == 0 ? this_count : 0); 262 int block_sectors = 0; 263 long error_sector; 264 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 265 266 #ifdef DEBUG 267 printk("sr.c done: %x\n", result); 268 #endif 269 270 /* 271 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 272 * success. Since this is a relatively rare error condition, no 273 * care is taken to avoid unnecessary additional work such as 274 * memcpy's that could be avoided. 275 */ 276 if (driver_byte(result) != 0 && /* An error occurred */ 277 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 278 switch (SCpnt->sense_buffer[2]) { 279 case MEDIUM_ERROR: 280 case VOLUME_OVERFLOW: 281 case ILLEGAL_REQUEST: 282 if (!(SCpnt->sense_buffer[0] & 0x90)) 283 break; 284 error_sector = (SCpnt->sense_buffer[3] << 24) | 285 (SCpnt->sense_buffer[4] << 16) | 286 (SCpnt->sense_buffer[5] << 8) | 287 SCpnt->sense_buffer[6]; 288 if (SCpnt->request->bio != NULL) 289 block_sectors = 290 bio_sectors(SCpnt->request->bio); 291 if (block_sectors < 4) 292 block_sectors = 4; 293 if (cd->device->sector_size == 2048) 294 error_sector <<= 2; 295 error_sector &= ~(block_sectors - 1); 296 good_bytes = (error_sector - 297 blk_rq_pos(SCpnt->request)) << 9; 298 if (good_bytes < 0 || good_bytes >= this_count) 299 good_bytes = 0; 300 /* 301 * The SCSI specification allows for the value 302 * returned by READ CAPACITY to be up to 75 2K 303 * sectors past the last readable block. 304 * Therefore, if we hit a medium error within the 305 * last 75 2K sectors, we decrease the saved size 306 * value. 307 */ 308 if (error_sector < get_capacity(cd->disk) && 309 cd->capacity - error_sector < 4 * 75) 310 set_capacity(cd->disk, error_sector); 311 break; 312 313 case RECOVERED_ERROR: 314 good_bytes = this_count; 315 break; 316 317 default: 318 break; 319 } 320 } 321 322 return good_bytes; 323 } 324 325 static int sr_prep_fn(struct request_queue *q, struct request *rq) 326 { 327 int block = 0, this_count, s_size; 328 struct scsi_cd *cd; 329 struct scsi_cmnd *SCpnt; 330 struct scsi_device *sdp = q->queuedata; 331 int ret; 332 333 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 334 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 335 goto out; 336 } else if (rq->cmd_type != REQ_TYPE_FS) { 337 ret = BLKPREP_KILL; 338 goto out; 339 } 340 ret = scsi_setup_fs_cmnd(sdp, rq); 341 if (ret != BLKPREP_OK) 342 goto out; 343 SCpnt = rq->special; 344 cd = scsi_cd(rq->rq_disk); 345 346 /* from here on until we're complete, any goto out 347 * is used for a killable error condition */ 348 ret = BLKPREP_KILL; 349 350 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", 351 cd->disk->disk_name, block)); 352 353 if (!cd->device || !scsi_device_online(cd->device)) { 354 SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n", 355 blk_rq_sectors(rq))); 356 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); 357 goto out; 358 } 359 360 if (cd->device->changed) { 361 /* 362 * quietly refuse to do anything to a changed disc until the 363 * changed bit has been reset 364 */ 365 goto out; 366 } 367 368 /* 369 * we do lazy blocksize switching (when reading XA sectors, 370 * see CDROMREADMODE2 ioctl) 371 */ 372 s_size = cd->device->sector_size; 373 if (s_size > 2048) { 374 if (!in_interrupt()) 375 sr_set_blocklength(cd, 2048); 376 else 377 printk("sr: can't switch blocksize: in interrupt\n"); 378 } 379 380 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 381 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 382 goto out; 383 } 384 385 if (rq_data_dir(rq) == WRITE) { 386 if (!cd->device->writeable) 387 goto out; 388 SCpnt->cmnd[0] = WRITE_10; 389 SCpnt->sc_data_direction = DMA_TO_DEVICE; 390 cd->cdi.media_written = 1; 391 } else if (rq_data_dir(rq) == READ) { 392 SCpnt->cmnd[0] = READ_10; 393 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 394 } else { 395 blk_dump_rq_flags(rq, "Unknown sr command"); 396 goto out; 397 } 398 399 { 400 struct scatterlist *sg; 401 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 402 403 scsi_for_each_sg(SCpnt, sg, sg_count, i) 404 size += sg->length; 405 406 if (size != scsi_bufflen(SCpnt)) { 407 scmd_printk(KERN_ERR, SCpnt, 408 "mismatch count %d, bytes %d\n", 409 size, scsi_bufflen(SCpnt)); 410 if (scsi_bufflen(SCpnt) > size) 411 SCpnt->sdb.length = size; 412 } 413 } 414 415 /* 416 * request doesn't start on hw block boundary, add scatter pads 417 */ 418 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 419 (scsi_bufflen(SCpnt) % s_size)) { 420 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 421 goto out; 422 } 423 424 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 425 426 427 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n", 428 cd->cdi.name, 429 (rq_data_dir(rq) == WRITE) ? 430 "writing" : "reading", 431 this_count, blk_rq_sectors(rq))); 432 433 SCpnt->cmnd[1] = 0; 434 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 435 436 if (this_count > 0xffff) { 437 this_count = 0xffff; 438 SCpnt->sdb.length = this_count * s_size; 439 } 440 441 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 442 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 443 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 444 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 445 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 446 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 447 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 448 449 /* 450 * We shouldn't disconnect in the middle of a sector, so with a dumb 451 * host adapter, it's safe to assume that we can at least transfer 452 * this many bytes between each connect / disconnect. 453 */ 454 SCpnt->transfersize = cd->device->sector_size; 455 SCpnt->underflow = this_count << 9; 456 SCpnt->allowed = MAX_RETRIES; 457 458 /* 459 * This indicates that the command is ready from our end to be 460 * queued. 461 */ 462 ret = BLKPREP_OK; 463 out: 464 return scsi_prep_return(q, rq, ret); 465 } 466 467 static int sr_block_open(struct block_device *bdev, fmode_t mode) 468 { 469 struct scsi_cd *cd = scsi_cd_get(bdev->bd_disk); 470 int ret = -ENXIO; 471 472 if (cd) { 473 ret = cdrom_open(&cd->cdi, bdev, mode); 474 if (ret) 475 scsi_cd_put(cd); 476 } 477 return ret; 478 } 479 480 static int sr_block_release(struct gendisk *disk, fmode_t mode) 481 { 482 struct scsi_cd *cd = scsi_cd(disk); 483 cdrom_release(&cd->cdi, mode); 484 scsi_cd_put(cd); 485 return 0; 486 } 487 488 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 489 unsigned long arg) 490 { 491 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 492 struct scsi_device *sdev = cd->device; 493 void __user *argp = (void __user *)arg; 494 int ret; 495 496 /* 497 * Send SCSI addressing ioctls directly to mid level, send other 498 * ioctls to cdrom/block level. 499 */ 500 switch (cmd) { 501 case SCSI_IOCTL_GET_IDLUN: 502 case SCSI_IOCTL_GET_BUS_NUMBER: 503 return scsi_ioctl(sdev, cmd, argp); 504 } 505 506 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 507 if (ret != -ENOSYS) 508 return ret; 509 510 /* 511 * ENODEV means that we didn't recognise the ioctl, or that we 512 * cannot execute it in the current device state. In either 513 * case fall through to scsi_ioctl, which will return ENDOEV again 514 * if it doesn't recognise the ioctl 515 */ 516 ret = scsi_nonblockable_ioctl(sdev, cmd, argp, 517 (mode & FMODE_NDELAY) != 0); 518 if (ret != -ENODEV) 519 return ret; 520 return scsi_ioctl(sdev, cmd, argp); 521 } 522 523 static int sr_block_media_changed(struct gendisk *disk) 524 { 525 struct scsi_cd *cd = scsi_cd(disk); 526 return cdrom_media_changed(&cd->cdi); 527 } 528 529 static const struct block_device_operations sr_bdops = 530 { 531 .owner = THIS_MODULE, 532 .open = sr_block_open, 533 .release = sr_block_release, 534 .locked_ioctl = sr_block_ioctl, 535 .media_changed = sr_block_media_changed, 536 /* 537 * No compat_ioctl for now because sr_block_ioctl never 538 * seems to pass arbitary ioctls down to host drivers. 539 */ 540 }; 541 542 static int sr_open(struct cdrom_device_info *cdi, int purpose) 543 { 544 struct scsi_cd *cd = cdi->handle; 545 struct scsi_device *sdev = cd->device; 546 int retval; 547 548 /* 549 * If the device is in error recovery, wait until it is done. 550 * If the device is offline, then disallow any access to it. 551 */ 552 retval = -ENXIO; 553 if (!scsi_block_when_processing_errors(sdev)) 554 goto error_out; 555 556 return 0; 557 558 error_out: 559 return retval; 560 } 561 562 static void sr_release(struct cdrom_device_info *cdi) 563 { 564 struct scsi_cd *cd = cdi->handle; 565 566 if (cd->device->sector_size > 2048) 567 sr_set_blocklength(cd, 2048); 568 569 } 570 571 static int sr_probe(struct device *dev) 572 { 573 struct scsi_device *sdev = to_scsi_device(dev); 574 struct gendisk *disk; 575 struct scsi_cd *cd; 576 int minor, error; 577 578 error = -ENODEV; 579 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 580 goto fail; 581 582 error = -ENOMEM; 583 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 584 if (!cd) 585 goto fail; 586 587 kref_init(&cd->kref); 588 589 disk = alloc_disk(1); 590 if (!disk) 591 goto fail_free; 592 593 spin_lock(&sr_index_lock); 594 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 595 if (minor == SR_DISKS) { 596 spin_unlock(&sr_index_lock); 597 error = -EBUSY; 598 goto fail_put; 599 } 600 __set_bit(minor, sr_index_bits); 601 spin_unlock(&sr_index_lock); 602 603 disk->major = SCSI_CDROM_MAJOR; 604 disk->first_minor = minor; 605 sprintf(disk->disk_name, "sr%d", minor); 606 disk->fops = &sr_bdops; 607 disk->flags = GENHD_FL_CD; 608 609 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 610 611 cd->device = sdev; 612 cd->disk = disk; 613 cd->driver = &sr_template; 614 cd->disk = disk; 615 cd->capacity = 0x1fffff; 616 cd->device->changed = 1; /* force recheck CD type */ 617 cd->previous_state = 1; 618 cd->use = 1; 619 cd->readcd_known = 0; 620 cd->readcd_cdda = 0; 621 622 cd->cdi.ops = &sr_dops; 623 cd->cdi.handle = cd; 624 cd->cdi.mask = 0; 625 cd->cdi.capacity = 1; 626 sprintf(cd->cdi.name, "sr%d", minor); 627 628 sdev->sector_size = 2048; /* A guess, just in case */ 629 630 /* FIXME: need to handle a get_capabilities failure properly ?? */ 631 get_capabilities(cd); 632 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn); 633 sr_vendor_init(cd); 634 635 disk->driverfs_dev = &sdev->sdev_gendev; 636 set_capacity(disk, cd->capacity); 637 disk->private_data = &cd->driver; 638 disk->queue = sdev->request_queue; 639 cd->cdi.disk = disk; 640 641 if (register_cdrom(&cd->cdi)) 642 goto fail_put; 643 644 dev_set_drvdata(dev, cd); 645 disk->flags |= GENHD_FL_REMOVABLE; 646 add_disk(disk); 647 648 sdev_printk(KERN_DEBUG, sdev, 649 "Attached scsi CD-ROM %s\n", cd->cdi.name); 650 return 0; 651 652 fail_put: 653 put_disk(disk); 654 fail_free: 655 kfree(cd); 656 fail: 657 return error; 658 } 659 660 661 static void get_sectorsize(struct scsi_cd *cd) 662 { 663 unsigned char cmd[10]; 664 unsigned char buffer[8]; 665 int the_result, retries = 3; 666 int sector_size; 667 struct request_queue *queue; 668 669 do { 670 cmd[0] = READ_CAPACITY; 671 memset((void *) &cmd[1], 0, 9); 672 memset(buffer, 0, sizeof(buffer)); 673 674 /* Do the command and wait.. */ 675 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 676 buffer, sizeof(buffer), NULL, 677 SR_TIMEOUT, MAX_RETRIES, NULL); 678 679 retries--; 680 681 } while (the_result && retries); 682 683 684 if (the_result) { 685 cd->capacity = 0x1fffff; 686 sector_size = 2048; /* A guess, just in case */ 687 } else { 688 long last_written; 689 690 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | 691 (buffer[2] << 8) | buffer[3]); 692 /* 693 * READ_CAPACITY doesn't return the correct size on 694 * certain UDF media. If last_written is larger, use 695 * it instead. 696 * 697 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 698 */ 699 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 700 cd->capacity = max_t(long, cd->capacity, last_written); 701 702 sector_size = (buffer[4] << 24) | 703 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 704 switch (sector_size) { 705 /* 706 * HP 4020i CD-Recorder reports 2340 byte sectors 707 * Philips CD-Writers report 2352 byte sectors 708 * 709 * Use 2k sectors for them.. 710 */ 711 case 0: 712 case 2340: 713 case 2352: 714 sector_size = 2048; 715 /* fall through */ 716 case 2048: 717 cd->capacity *= 4; 718 /* fall through */ 719 case 512: 720 break; 721 default: 722 printk("%s: unsupported sector size %d.\n", 723 cd->cdi.name, sector_size); 724 cd->capacity = 0; 725 } 726 727 cd->device->sector_size = sector_size; 728 729 /* 730 * Add this so that we have the ability to correctly gauge 731 * what the device is capable of. 732 */ 733 set_capacity(cd->disk, cd->capacity); 734 } 735 736 queue = cd->device->request_queue; 737 blk_queue_logical_block_size(queue, sector_size); 738 739 return; 740 } 741 742 static void get_capabilities(struct scsi_cd *cd) 743 { 744 unsigned char *buffer; 745 struct scsi_mode_data data; 746 struct scsi_sense_hdr sshdr; 747 int rc, n; 748 749 static const char *loadmech[] = 750 { 751 "caddy", 752 "tray", 753 "pop-up", 754 "", 755 "changer", 756 "cartridge changer", 757 "", 758 "" 759 }; 760 761 762 /* allocate transfer buffer */ 763 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 764 if (!buffer) { 765 printk(KERN_ERR "sr: out of memory.\n"); 766 return; 767 } 768 769 /* eat unit attentions */ 770 sr_test_unit_ready(cd->device, &sshdr); 771 772 /* ask for mode page 0x2a */ 773 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, 774 SR_TIMEOUT, 3, &data, NULL); 775 776 if (!scsi_status_is_good(rc)) { 777 /* failed, drive doesn't have capabilities mode page */ 778 cd->cdi.speed = 1; 779 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 780 CDC_DVD | CDC_DVD_RAM | 781 CDC_SELECT_DISC | CDC_SELECT_SPEED | 782 CDC_MRW | CDC_MRW_W | CDC_RAM); 783 kfree(buffer); 784 printk("%s: scsi-1 drive\n", cd->cdi.name); 785 return; 786 } 787 788 n = data.header_length + data.block_descriptor_length; 789 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 790 cd->readcd_known = 1; 791 cd->readcd_cdda = buffer[n + 5] & 0x01; 792 /* print some capability bits */ 793 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, 794 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 795 cd->cdi.speed, 796 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 797 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 798 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 799 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 800 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 801 loadmech[buffer[n + 6] >> 5]); 802 if ((buffer[n + 6] >> 5) == 0) 803 /* caddy drives can't close tray... */ 804 cd->cdi.mask |= CDC_CLOSE_TRAY; 805 if ((buffer[n + 2] & 0x8) == 0) 806 /* not a DVD drive */ 807 cd->cdi.mask |= CDC_DVD; 808 if ((buffer[n + 3] & 0x20) == 0) 809 /* can't write DVD-RAM media */ 810 cd->cdi.mask |= CDC_DVD_RAM; 811 if ((buffer[n + 3] & 0x10) == 0) 812 /* can't write DVD-R media */ 813 cd->cdi.mask |= CDC_DVD_R; 814 if ((buffer[n + 3] & 0x2) == 0) 815 /* can't write CD-RW media */ 816 cd->cdi.mask |= CDC_CD_RW; 817 if ((buffer[n + 3] & 0x1) == 0) 818 /* can't write CD-R media */ 819 cd->cdi.mask |= CDC_CD_R; 820 if ((buffer[n + 6] & 0x8) == 0) 821 /* can't eject */ 822 cd->cdi.mask |= CDC_OPEN_TRAY; 823 824 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 825 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 826 cd->cdi.capacity = 827 cdrom_number_of_slots(&cd->cdi); 828 if (cd->cdi.capacity <= 1) 829 /* not a changer */ 830 cd->cdi.mask |= CDC_SELECT_DISC; 831 /*else I don't think it can close its tray 832 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 833 834 /* 835 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 836 */ 837 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 838 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 839 cd->device->writeable = 1; 840 } 841 842 kfree(buffer); 843 } 844 845 /* 846 * sr_packet() is the entry point for the generic commands generated 847 * by the Uniform CD-ROM layer. 848 */ 849 static int sr_packet(struct cdrom_device_info *cdi, 850 struct packet_command *cgc) 851 { 852 if (cgc->timeout <= 0) 853 cgc->timeout = IOCTL_TIMEOUT; 854 855 sr_do_ioctl(cdi->handle, cgc); 856 857 return cgc->stat; 858 } 859 860 /** 861 * sr_kref_release - Called to free the scsi_cd structure 862 * @kref: pointer to embedded kref 863 * 864 * sr_ref_mutex must be held entering this routine. Because it is 865 * called on last put, you should always use the scsi_cd_get() 866 * scsi_cd_put() helpers which manipulate the semaphore directly 867 * and never do a direct kref_put(). 868 **/ 869 static void sr_kref_release(struct kref *kref) 870 { 871 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 872 struct gendisk *disk = cd->disk; 873 874 spin_lock(&sr_index_lock); 875 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 876 spin_unlock(&sr_index_lock); 877 878 unregister_cdrom(&cd->cdi); 879 880 disk->private_data = NULL; 881 882 put_disk(disk); 883 884 kfree(cd); 885 } 886 887 static int sr_remove(struct device *dev) 888 { 889 struct scsi_cd *cd = dev_get_drvdata(dev); 890 891 blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn); 892 del_gendisk(cd->disk); 893 894 mutex_lock(&sr_ref_mutex); 895 kref_put(&cd->kref, sr_kref_release); 896 mutex_unlock(&sr_ref_mutex); 897 898 return 0; 899 } 900 901 static int __init init_sr(void) 902 { 903 int rc; 904 905 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 906 if (rc) 907 return rc; 908 rc = scsi_register_driver(&sr_template.gendrv); 909 if (rc) 910 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 911 912 return rc; 913 } 914 915 static void __exit exit_sr(void) 916 { 917 scsi_unregister_driver(&sr_template.gendrv); 918 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 919 } 920 921 module_init(init_sr); 922 module_exit(exit_sr); 923 MODULE_LICENSE("GPL"); 924