1 /* 2 * sd.c Copyright (C) 1992 Drew Eckhardt 3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 4 * 5 * Linux scsi disk driver 6 * Initial versions: Drew Eckhardt 7 * Subsequent revisions: Eric Youngdale 8 * Modification history: 9 * - Drew Eckhardt <drew@colorado.edu> original 10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 11 * outstanding request, and other enhancements. 12 * Support loadable low-level scsi drivers. 13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 14 * eight major numbers. 15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs. 16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 17 * sd_init and cleanups. 18 * - Alex Davis <letmein@erols.com> Fix problem where partition info 19 * not being read in sd_open. Fix problem where removable media 20 * could be ejected after sd_open. 21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x 22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 24 * Support 32k/1M disks. 25 * 26 * Logging policy (needs CONFIG_SCSI_LOGGING defined): 27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2 28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1 29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1 30 * - entering other commands: SCSI_LOG_HLQUEUE level 3 31 * Note: when the logging level is set by the user, it must be greater 32 * than the level indicated above to trigger output. 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/genhd.h> 41 #include <linux/hdreg.h> 42 #include <linux/errno.h> 43 #include <linux/idr.h> 44 #include <linux/interrupt.h> 45 #include <linux/init.h> 46 #include <linux/blkdev.h> 47 #include <linux/blkpg.h> 48 #include <linux/delay.h> 49 #include <linux/mutex.h> 50 #include <linux/string_helpers.h> 51 #include <linux/async.h> 52 #include <linux/slab.h> 53 #include <asm/uaccess.h> 54 #include <asm/unaligned.h> 55 56 #include <scsi/scsi.h> 57 #include <scsi/scsi_cmnd.h> 58 #include <scsi/scsi_dbg.h> 59 #include <scsi/scsi_device.h> 60 #include <scsi/scsi_driver.h> 61 #include <scsi/scsi_eh.h> 62 #include <scsi/scsi_host.h> 63 #include <scsi/scsi_ioctl.h> 64 #include <scsi/scsicam.h> 65 66 #include "sd.h" 67 #include "scsi_logging.h" 68 69 MODULE_AUTHOR("Eric Youngdale"); 70 MODULE_DESCRIPTION("SCSI disk (sd) driver"); 71 MODULE_LICENSE("GPL"); 72 73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 89 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 90 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 91 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 92 93 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) 94 #define SD_MINORS 16 95 #else 96 #define SD_MINORS 0 97 #endif 98 99 static int sd_revalidate_disk(struct gendisk *); 100 static int sd_probe(struct device *); 101 static int sd_remove(struct device *); 102 static void sd_shutdown(struct device *); 103 static int sd_suspend(struct device *, pm_message_t state); 104 static int sd_resume(struct device *); 105 static void sd_rescan(struct device *); 106 static int sd_done(struct scsi_cmnd *); 107 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); 108 static void scsi_disk_release(struct device *cdev); 109 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); 110 static void sd_print_result(struct scsi_disk *, int); 111 112 static DEFINE_SPINLOCK(sd_index_lock); 113 static DEFINE_IDA(sd_index_ida); 114 115 /* This semaphore is used to mediate the 0->1 reference get in the 116 * face of object destruction (i.e. we can't allow a get on an 117 * object after last put) */ 118 static DEFINE_MUTEX(sd_ref_mutex); 119 120 struct kmem_cache *sd_cdb_cache; 121 mempool_t *sd_cdb_pool; 122 123 static const char *sd_cache_types[] = { 124 "write through", "none", "write back", 125 "write back, no read (daft)" 126 }; 127 128 static ssize_t 129 sd_store_cache_type(struct device *dev, struct device_attribute *attr, 130 const char *buf, size_t count) 131 { 132 int i, ct = -1, rcd, wce, sp; 133 struct scsi_disk *sdkp = to_scsi_disk(dev); 134 struct scsi_device *sdp = sdkp->device; 135 char buffer[64]; 136 char *buffer_data; 137 struct scsi_mode_data data; 138 struct scsi_sense_hdr sshdr; 139 int len; 140 141 if (sdp->type != TYPE_DISK) 142 /* no cache control on RBC devices; theoretically they 143 * can do it, but there's probably so many exceptions 144 * it's not worth the risk */ 145 return -EINVAL; 146 147 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 148 const int len = strlen(sd_cache_types[i]); 149 if (strncmp(sd_cache_types[i], buf, len) == 0 && 150 buf[len] == '\n') { 151 ct = i; 152 break; 153 } 154 } 155 if (ct < 0) 156 return -EINVAL; 157 rcd = ct & 0x01 ? 1 : 0; 158 wce = ct & 0x02 ? 1 : 0; 159 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 160 SD_MAX_RETRIES, &data, NULL)) 161 return -EINVAL; 162 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 163 data.block_descriptor_length); 164 buffer_data = buffer + data.header_length + 165 data.block_descriptor_length; 166 buffer_data[2] &= ~0x05; 167 buffer_data[2] |= wce << 2 | rcd; 168 sp = buffer_data[0] & 0x80 ? 1 : 0; 169 170 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 171 SD_MAX_RETRIES, &data, &sshdr)) { 172 if (scsi_sense_valid(&sshdr)) 173 sd_print_sense_hdr(sdkp, &sshdr); 174 return -EINVAL; 175 } 176 revalidate_disk(sdkp->disk); 177 return count; 178 } 179 180 static ssize_t 181 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, 182 const char *buf, size_t count) 183 { 184 struct scsi_disk *sdkp = to_scsi_disk(dev); 185 struct scsi_device *sdp = sdkp->device; 186 187 if (!capable(CAP_SYS_ADMIN)) 188 return -EACCES; 189 190 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 191 192 return count; 193 } 194 195 static ssize_t 196 sd_store_allow_restart(struct device *dev, struct device_attribute *attr, 197 const char *buf, size_t count) 198 { 199 struct scsi_disk *sdkp = to_scsi_disk(dev); 200 struct scsi_device *sdp = sdkp->device; 201 202 if (!capable(CAP_SYS_ADMIN)) 203 return -EACCES; 204 205 if (sdp->type != TYPE_DISK) 206 return -EINVAL; 207 208 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 209 210 return count; 211 } 212 213 static ssize_t 214 sd_show_cache_type(struct device *dev, struct device_attribute *attr, 215 char *buf) 216 { 217 struct scsi_disk *sdkp = to_scsi_disk(dev); 218 int ct = sdkp->RCD + 2*sdkp->WCE; 219 220 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); 221 } 222 223 static ssize_t 224 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) 225 { 226 struct scsi_disk *sdkp = to_scsi_disk(dev); 227 228 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); 229 } 230 231 static ssize_t 232 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, 233 char *buf) 234 { 235 struct scsi_disk *sdkp = to_scsi_disk(dev); 236 struct scsi_device *sdp = sdkp->device; 237 238 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); 239 } 240 241 static ssize_t 242 sd_show_allow_restart(struct device *dev, struct device_attribute *attr, 243 char *buf) 244 { 245 struct scsi_disk *sdkp = to_scsi_disk(dev); 246 247 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); 248 } 249 250 static ssize_t 251 sd_show_protection_type(struct device *dev, struct device_attribute *attr, 252 char *buf) 253 { 254 struct scsi_disk *sdkp = to_scsi_disk(dev); 255 256 return snprintf(buf, 20, "%u\n", sdkp->protection_type); 257 } 258 259 static ssize_t 260 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, 261 char *buf) 262 { 263 struct scsi_disk *sdkp = to_scsi_disk(dev); 264 265 return snprintf(buf, 20, "%u\n", sdkp->ATO); 266 } 267 268 static ssize_t 269 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr, 270 char *buf) 271 { 272 struct scsi_disk *sdkp = to_scsi_disk(dev); 273 274 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning); 275 } 276 277 static struct device_attribute sd_disk_attrs[] = { 278 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, 279 sd_store_cache_type), 280 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), 281 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, 282 sd_store_allow_restart), 283 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, 284 sd_store_manage_start_stop), 285 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), 286 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), 287 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL), 288 __ATTR_NULL, 289 }; 290 291 static struct class sd_disk_class = { 292 .name = "scsi_disk", 293 .owner = THIS_MODULE, 294 .dev_release = scsi_disk_release, 295 .dev_attrs = sd_disk_attrs, 296 }; 297 298 static struct scsi_driver sd_template = { 299 .owner = THIS_MODULE, 300 .gendrv = { 301 .name = "sd", 302 .probe = sd_probe, 303 .remove = sd_remove, 304 .suspend = sd_suspend, 305 .resume = sd_resume, 306 .shutdown = sd_shutdown, 307 }, 308 .rescan = sd_rescan, 309 .done = sd_done, 310 }; 311 312 /* 313 * Device no to disk mapping: 314 * 315 * major disc2 disc p1 316 * |............|.............|....|....| <- dev_t 317 * 31 20 19 8 7 4 3 0 318 * 319 * Inside a major, we have 16k disks, however mapped non- 320 * contiguously. The first 16 disks are for major0, the next 321 * ones with major1, ... Disk 256 is for major0 again, disk 272 322 * for major1, ... 323 * As we stay compatible with our numbering scheme, we can reuse 324 * the well-know SCSI majors 8, 65--71, 136--143. 325 */ 326 static int sd_major(int major_idx) 327 { 328 switch (major_idx) { 329 case 0: 330 return SCSI_DISK0_MAJOR; 331 case 1 ... 7: 332 return SCSI_DISK1_MAJOR + major_idx - 1; 333 case 8 ... 15: 334 return SCSI_DISK8_MAJOR + major_idx - 8; 335 default: 336 BUG(); 337 return 0; /* shut up gcc */ 338 } 339 } 340 341 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) 342 { 343 struct scsi_disk *sdkp = NULL; 344 345 if (disk->private_data) { 346 sdkp = scsi_disk(disk); 347 if (scsi_device_get(sdkp->device) == 0) 348 get_device(&sdkp->dev); 349 else 350 sdkp = NULL; 351 } 352 return sdkp; 353 } 354 355 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 356 { 357 struct scsi_disk *sdkp; 358 359 mutex_lock(&sd_ref_mutex); 360 sdkp = __scsi_disk_get(disk); 361 mutex_unlock(&sd_ref_mutex); 362 return sdkp; 363 } 364 365 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) 366 { 367 struct scsi_disk *sdkp; 368 369 mutex_lock(&sd_ref_mutex); 370 sdkp = dev_get_drvdata(dev); 371 if (sdkp) 372 sdkp = __scsi_disk_get(sdkp->disk); 373 mutex_unlock(&sd_ref_mutex); 374 return sdkp; 375 } 376 377 static void scsi_disk_put(struct scsi_disk *sdkp) 378 { 379 struct scsi_device *sdev = sdkp->device; 380 381 mutex_lock(&sd_ref_mutex); 382 put_device(&sdkp->dev); 383 scsi_device_put(sdev); 384 mutex_unlock(&sd_ref_mutex); 385 } 386 387 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif) 388 { 389 unsigned int prot_op = SCSI_PROT_NORMAL; 390 unsigned int dix = scsi_prot_sg_count(scmd); 391 392 if (scmd->sc_data_direction == DMA_FROM_DEVICE) { 393 if (dif && dix) 394 prot_op = SCSI_PROT_READ_PASS; 395 else if (dif && !dix) 396 prot_op = SCSI_PROT_READ_STRIP; 397 else if (!dif && dix) 398 prot_op = SCSI_PROT_READ_INSERT; 399 } else { 400 if (dif && dix) 401 prot_op = SCSI_PROT_WRITE_PASS; 402 else if (dif && !dix) 403 prot_op = SCSI_PROT_WRITE_INSERT; 404 else if (!dif && dix) 405 prot_op = SCSI_PROT_WRITE_STRIP; 406 } 407 408 scsi_set_prot_op(scmd, prot_op); 409 scsi_set_prot_type(scmd, dif); 410 } 411 412 /** 413 * sd_prepare_discard - unmap blocks on thinly provisioned device 414 * @rq: Request to prepare 415 * 416 * Will issue either UNMAP or WRITE SAME(16) depending on preference 417 * indicated by target device. 418 **/ 419 static int sd_prepare_discard(struct request *rq) 420 { 421 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 422 struct bio *bio = rq->bio; 423 sector_t sector = bio->bi_sector; 424 unsigned int num = bio_sectors(bio); 425 426 if (sdkp->device->sector_size == 4096) { 427 sector >>= 3; 428 num >>= 3; 429 } 430 431 rq->cmd_type = REQ_TYPE_BLOCK_PC; 432 rq->timeout = SD_TIMEOUT; 433 434 memset(rq->cmd, 0, rq->cmd_len); 435 436 if (sdkp->unmap) { 437 char *buf = kmap_atomic(bio_page(bio), KM_USER0); 438 439 rq->cmd[0] = UNMAP; 440 rq->cmd[8] = 24; 441 rq->cmd_len = 10; 442 443 /* Ensure that data length matches payload */ 444 rq->__data_len = bio->bi_size = bio->bi_io_vec->bv_len = 24; 445 446 put_unaligned_be16(6 + 16, &buf[0]); 447 put_unaligned_be16(16, &buf[2]); 448 put_unaligned_be64(sector, &buf[8]); 449 put_unaligned_be32(num, &buf[16]); 450 451 kunmap_atomic(buf, KM_USER0); 452 } else { 453 rq->cmd[0] = WRITE_SAME_16; 454 rq->cmd[1] = 0x8; /* UNMAP */ 455 put_unaligned_be64(sector, &rq->cmd[2]); 456 put_unaligned_be32(num, &rq->cmd[10]); 457 rq->cmd_len = 16; 458 } 459 460 return BLKPREP_OK; 461 } 462 463 /** 464 * sd_init_command - build a scsi (read or write) command from 465 * information in the request structure. 466 * @SCpnt: pointer to mid-level's per scsi command structure that 467 * contains request and into which the scsi command is written 468 * 469 * Returns 1 if successful and 0 if error (or cannot be done now). 470 **/ 471 static int sd_prep_fn(struct request_queue *q, struct request *rq) 472 { 473 struct scsi_cmnd *SCpnt; 474 struct scsi_device *sdp = q->queuedata; 475 struct gendisk *disk = rq->rq_disk; 476 struct scsi_disk *sdkp; 477 sector_t block = blk_rq_pos(rq); 478 sector_t threshold; 479 unsigned int this_count = blk_rq_sectors(rq); 480 int ret, host_dif; 481 unsigned char protect; 482 483 /* 484 * Discard request come in as REQ_TYPE_FS but we turn them into 485 * block PC requests to make life easier. 486 */ 487 if (blk_discard_rq(rq)) 488 ret = sd_prepare_discard(rq); 489 490 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 491 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 492 goto out; 493 } else if (rq->cmd_type != REQ_TYPE_FS) { 494 ret = BLKPREP_KILL; 495 goto out; 496 } 497 ret = scsi_setup_fs_cmnd(sdp, rq); 498 if (ret != BLKPREP_OK) 499 goto out; 500 SCpnt = rq->special; 501 sdkp = scsi_disk(disk); 502 503 /* from here on until we're complete, any goto out 504 * is used for a killable error condition */ 505 ret = BLKPREP_KILL; 506 507 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 508 "sd_init_command: block=%llu, " 509 "count=%d\n", 510 (unsigned long long)block, 511 this_count)); 512 513 if (!sdp || !scsi_device_online(sdp) || 514 block + blk_rq_sectors(rq) > get_capacity(disk)) { 515 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 516 "Finishing %u sectors\n", 517 blk_rq_sectors(rq))); 518 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 519 "Retry with 0x%p\n", SCpnt)); 520 goto out; 521 } 522 523 if (sdp->changed) { 524 /* 525 * quietly refuse to do anything to a changed disc until 526 * the changed bit has been reset 527 */ 528 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ 529 goto out; 530 } 531 532 /* 533 * Some SD card readers can't handle multi-sector accesses which touch 534 * the last one or two hardware sectors. Split accesses as needed. 535 */ 536 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 537 (sdp->sector_size / 512); 538 539 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 540 if (block < threshold) { 541 /* Access up to the threshold but not beyond */ 542 this_count = threshold - block; 543 } else { 544 /* Access only a single hardware sector */ 545 this_count = sdp->sector_size / 512; 546 } 547 } 548 549 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 550 (unsigned long long)block)); 551 552 /* 553 * If we have a 1K hardware sectorsize, prevent access to single 554 * 512 byte sectors. In theory we could handle this - in fact 555 * the scsi cdrom driver must be able to handle this because 556 * we typically use 1K blocksizes, and cdroms typically have 557 * 2K hardware sectorsizes. Of course, things are simpler 558 * with the cdrom, since it is read-only. For performance 559 * reasons, the filesystems should be able to handle this 560 * and not force the scsi disk driver to use bounce buffers 561 * for this. 562 */ 563 if (sdp->sector_size == 1024) { 564 if ((block & 1) || (blk_rq_sectors(rq) & 1)) { 565 scmd_printk(KERN_ERR, SCpnt, 566 "Bad block number requested\n"); 567 goto out; 568 } else { 569 block = block >> 1; 570 this_count = this_count >> 1; 571 } 572 } 573 if (sdp->sector_size == 2048) { 574 if ((block & 3) || (blk_rq_sectors(rq) & 3)) { 575 scmd_printk(KERN_ERR, SCpnt, 576 "Bad block number requested\n"); 577 goto out; 578 } else { 579 block = block >> 2; 580 this_count = this_count >> 2; 581 } 582 } 583 if (sdp->sector_size == 4096) { 584 if ((block & 7) || (blk_rq_sectors(rq) & 7)) { 585 scmd_printk(KERN_ERR, SCpnt, 586 "Bad block number requested\n"); 587 goto out; 588 } else { 589 block = block >> 3; 590 this_count = this_count >> 3; 591 } 592 } 593 if (rq_data_dir(rq) == WRITE) { 594 if (!sdp->writeable) { 595 goto out; 596 } 597 SCpnt->cmnd[0] = WRITE_6; 598 SCpnt->sc_data_direction = DMA_TO_DEVICE; 599 600 if (blk_integrity_rq(rq) && 601 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO) 602 goto out; 603 604 } else if (rq_data_dir(rq) == READ) { 605 SCpnt->cmnd[0] = READ_6; 606 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 607 } else { 608 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); 609 goto out; 610 } 611 612 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 613 "%s %d/%u 512 byte blocks.\n", 614 (rq_data_dir(rq) == WRITE) ? 615 "writing" : "reading", this_count, 616 blk_rq_sectors(rq))); 617 618 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ 619 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 620 if (host_dif) 621 protect = 1 << 5; 622 else 623 protect = 0; 624 625 if (host_dif == SD_DIF_TYPE2_PROTECTION) { 626 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); 627 628 if (unlikely(SCpnt->cmnd == NULL)) { 629 ret = BLKPREP_DEFER; 630 goto out; 631 } 632 633 SCpnt->cmd_len = SD_EXT_CDB_SIZE; 634 memset(SCpnt->cmnd, 0, SCpnt->cmd_len); 635 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; 636 SCpnt->cmnd[7] = 0x18; 637 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; 638 SCpnt->cmnd[10] = protect | (blk_fua_rq(rq) ? 0x8 : 0); 639 640 /* LBA */ 641 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 642 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 643 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 644 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 645 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; 646 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; 647 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; 648 SCpnt->cmnd[19] = (unsigned char) block & 0xff; 649 650 /* Expected Indirect LBA */ 651 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; 652 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; 653 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; 654 SCpnt->cmnd[23] = (unsigned char) block & 0xff; 655 656 /* Transfer length */ 657 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; 658 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; 659 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; 660 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; 661 } else if (block > 0xffffffff) { 662 SCpnt->cmnd[0] += READ_16 - READ_6; 663 SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0); 664 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 665 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 666 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 667 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 668 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 669 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 670 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 671 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 672 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 673 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 674 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 675 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 676 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 677 } else if ((this_count > 0xff) || (block > 0x1fffff) || 678 scsi_device_protection(SCpnt->device) || 679 SCpnt->device->use_10_for_rw) { 680 if (this_count > 0xffff) 681 this_count = 0xffff; 682 683 SCpnt->cmnd[0] += READ_10 - READ_6; 684 SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0); 685 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 686 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 687 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 688 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 689 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 690 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 691 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 692 } else { 693 if (unlikely(blk_fua_rq(rq))) { 694 /* 695 * This happens only if this drive failed 696 * 10byte rw command with ILLEGAL_REQUEST 697 * during operation and thus turned off 698 * use_10_for_rw. 699 */ 700 scmd_printk(KERN_ERR, SCpnt, 701 "FUA write on READ/WRITE(6) drive\n"); 702 goto out; 703 } 704 705 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 706 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 707 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 708 SCpnt->cmnd[4] = (unsigned char) this_count; 709 SCpnt->cmnd[5] = 0; 710 } 711 SCpnt->sdb.length = this_count * sdp->sector_size; 712 713 /* If DIF or DIX is enabled, tell HBA how to handle request */ 714 if (host_dif || scsi_prot_sg_count(SCpnt)) 715 sd_prot_op(SCpnt, host_dif); 716 717 /* 718 * We shouldn't disconnect in the middle of a sector, so with a dumb 719 * host adapter, it's safe to assume that we can at least transfer 720 * this many bytes between each connect / disconnect. 721 */ 722 SCpnt->transfersize = sdp->sector_size; 723 SCpnt->underflow = this_count << 9; 724 SCpnt->allowed = SD_MAX_RETRIES; 725 726 /* 727 * This indicates that the command is ready from our end to be 728 * queued. 729 */ 730 ret = BLKPREP_OK; 731 out: 732 return scsi_prep_return(q, rq, ret); 733 } 734 735 /** 736 * sd_open - open a scsi disk device 737 * @inode: only i_rdev member may be used 738 * @filp: only f_mode and f_flags may be used 739 * 740 * Returns 0 if successful. Returns a negated errno value in case 741 * of error. 742 * 743 * Note: This can be called from a user context (e.g. fsck(1) ) 744 * or from within the kernel (e.g. as a result of a mount(1) ). 745 * In the latter case @inode and @filp carry an abridged amount 746 * of information as noted above. 747 **/ 748 static int sd_open(struct block_device *bdev, fmode_t mode) 749 { 750 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 751 struct scsi_device *sdev; 752 int retval; 753 754 if (!sdkp) 755 return -ENXIO; 756 757 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 758 759 sdev = sdkp->device; 760 761 /* 762 * If the device is in error recovery, wait until it is done. 763 * If the device is offline, then disallow any access to it. 764 */ 765 retval = -ENXIO; 766 if (!scsi_block_when_processing_errors(sdev)) 767 goto error_out; 768 769 if (sdev->removable || sdkp->write_prot) 770 check_disk_change(bdev); 771 772 /* 773 * If the drive is empty, just let the open fail. 774 */ 775 retval = -ENOMEDIUM; 776 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 777 goto error_out; 778 779 /* 780 * If the device has the write protect tab set, have the open fail 781 * if the user expects to be able to write to the thing. 782 */ 783 retval = -EROFS; 784 if (sdkp->write_prot && (mode & FMODE_WRITE)) 785 goto error_out; 786 787 /* 788 * It is possible that the disk changing stuff resulted in 789 * the device being taken offline. If this is the case, 790 * report this to the user, and don't pretend that the 791 * open actually succeeded. 792 */ 793 retval = -ENXIO; 794 if (!scsi_device_online(sdev)) 795 goto error_out; 796 797 if (!sdkp->openers++ && sdev->removable) { 798 if (scsi_block_when_processing_errors(sdev)) 799 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 800 } 801 802 return 0; 803 804 error_out: 805 scsi_disk_put(sdkp); 806 return retval; 807 } 808 809 /** 810 * sd_release - invoked when the (last) close(2) is called on this 811 * scsi disk. 812 * @inode: only i_rdev member may be used 813 * @filp: only f_mode and f_flags may be used 814 * 815 * Returns 0. 816 * 817 * Note: may block (uninterruptible) if error recovery is underway 818 * on this disk. 819 **/ 820 static int sd_release(struct gendisk *disk, fmode_t mode) 821 { 822 struct scsi_disk *sdkp = scsi_disk(disk); 823 struct scsi_device *sdev = sdkp->device; 824 825 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 826 827 if (!--sdkp->openers && sdev->removable) { 828 if (scsi_block_when_processing_errors(sdev)) 829 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 830 } 831 832 /* 833 * XXX and what if there are packets in flight and this close() 834 * XXX is followed by a "rmmod sd_mod"? 835 */ 836 scsi_disk_put(sdkp); 837 return 0; 838 } 839 840 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 841 { 842 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 843 struct scsi_device *sdp = sdkp->device; 844 struct Scsi_Host *host = sdp->host; 845 int diskinfo[4]; 846 847 /* default to most commonly used values */ 848 diskinfo[0] = 0x40; /* 1 << 6 */ 849 diskinfo[1] = 0x20; /* 1 << 5 */ 850 diskinfo[2] = sdkp->capacity >> 11; 851 852 /* override with calculated, extended default, or driver values */ 853 if (host->hostt->bios_param) 854 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 855 else 856 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 857 858 geo->heads = diskinfo[0]; 859 geo->sectors = diskinfo[1]; 860 geo->cylinders = diskinfo[2]; 861 return 0; 862 } 863 864 /** 865 * sd_ioctl - process an ioctl 866 * @inode: only i_rdev/i_bdev members may be used 867 * @filp: only f_mode and f_flags may be used 868 * @cmd: ioctl command number 869 * @arg: this is third argument given to ioctl(2) system call. 870 * Often contains a pointer. 871 * 872 * Returns 0 if successful (some ioctls return postive numbers on 873 * success as well). Returns a negated errno value in case of error. 874 * 875 * Note: most ioctls are forward onto the block subsystem or further 876 * down in the scsi subsystem. 877 **/ 878 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 879 unsigned int cmd, unsigned long arg) 880 { 881 struct gendisk *disk = bdev->bd_disk; 882 struct scsi_device *sdp = scsi_disk(disk)->device; 883 void __user *p = (void __user *)arg; 884 int error; 885 886 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", 887 disk->disk_name, cmd)); 888 889 /* 890 * If we are in the middle of error recovery, don't let anyone 891 * else try and use this device. Also, if error recovery fails, it 892 * may try and take the device offline, in which case all further 893 * access to the device is prohibited. 894 */ 895 error = scsi_nonblockable_ioctl(sdp, cmd, p, 896 (mode & FMODE_NDELAY) != 0); 897 if (!scsi_block_when_processing_errors(sdp) || !error) 898 return error; 899 900 /* 901 * Send SCSI addressing ioctls directly to mid level, send other 902 * ioctls to block level and then onto mid level if they can't be 903 * resolved. 904 */ 905 switch (cmd) { 906 case SCSI_IOCTL_GET_IDLUN: 907 case SCSI_IOCTL_GET_BUS_NUMBER: 908 return scsi_ioctl(sdp, cmd, p); 909 default: 910 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p); 911 if (error != -ENOTTY) 912 return error; 913 } 914 return scsi_ioctl(sdp, cmd, p); 915 } 916 917 static void set_media_not_present(struct scsi_disk *sdkp) 918 { 919 sdkp->media_present = 0; 920 sdkp->capacity = 0; 921 sdkp->device->changed = 1; 922 } 923 924 /** 925 * sd_media_changed - check if our medium changed 926 * @disk: kernel device descriptor 927 * 928 * Returns 0 if not applicable or no change; 1 if change 929 * 930 * Note: this function is invoked from the block subsystem. 931 **/ 932 static int sd_media_changed(struct gendisk *disk) 933 { 934 struct scsi_disk *sdkp = scsi_disk(disk); 935 struct scsi_device *sdp = sdkp->device; 936 struct scsi_sense_hdr *sshdr = NULL; 937 int retval; 938 939 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); 940 941 if (!sdp->removable) 942 return 0; 943 944 /* 945 * If the device is offline, don't send any commands - just pretend as 946 * if the command failed. If the device ever comes back online, we 947 * can deal with it then. It is only because of unrecoverable errors 948 * that we would ever take a device offline in the first place. 949 */ 950 if (!scsi_device_online(sdp)) { 951 set_media_not_present(sdkp); 952 retval = 1; 953 goto out; 954 } 955 956 /* 957 * Using TEST_UNIT_READY enables differentiation between drive with 958 * no cartridge loaded - NOT READY, drive with changed cartridge - 959 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 960 * 961 * Drives that auto spin down. eg iomega jaz 1G, will be started 962 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 963 * sd_revalidate() is called. 964 */ 965 retval = -ENODEV; 966 967 if (scsi_block_when_processing_errors(sdp)) { 968 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 969 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 970 sshdr); 971 } 972 973 /* 974 * Unable to test, unit probably not ready. This usually 975 * means there is no disc in the drive. Mark as changed, 976 * and we will figure it out later once the drive is 977 * available again. 978 */ 979 if (retval || (scsi_sense_valid(sshdr) && 980 /* 0x3a is medium not present */ 981 sshdr->asc == 0x3a)) { 982 set_media_not_present(sdkp); 983 retval = 1; 984 goto out; 985 } 986 987 /* 988 * For removable scsi disk we have to recognise the presence 989 * of a disk in the drive. This is kept in the struct scsi_disk 990 * struct and tested at open ! Daniel Roche (dan@lectra.fr) 991 */ 992 sdkp->media_present = 1; 993 994 retval = sdp->changed; 995 sdp->changed = 0; 996 out: 997 if (retval != sdkp->previous_state) 998 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL); 999 sdkp->previous_state = retval; 1000 kfree(sshdr); 1001 return retval; 1002 } 1003 1004 static int sd_sync_cache(struct scsi_disk *sdkp) 1005 { 1006 int retries, res; 1007 struct scsi_device *sdp = sdkp->device; 1008 struct scsi_sense_hdr sshdr; 1009 1010 if (!scsi_device_online(sdp)) 1011 return -ENODEV; 1012 1013 1014 for (retries = 3; retries > 0; --retries) { 1015 unsigned char cmd[10] = { 0 }; 1016 1017 cmd[0] = SYNCHRONIZE_CACHE; 1018 /* 1019 * Leave the rest of the command zero to indicate 1020 * flush everything. 1021 */ 1022 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 1023 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1024 if (res == 0) 1025 break; 1026 } 1027 1028 if (res) { 1029 sd_print_result(sdkp, res); 1030 if (driver_byte(res) & DRIVER_SENSE) 1031 sd_print_sense_hdr(sdkp, &sshdr); 1032 } 1033 1034 if (res) 1035 return -EIO; 1036 return 0; 1037 } 1038 1039 static void sd_prepare_flush(struct request_queue *q, struct request *rq) 1040 { 1041 rq->cmd_type = REQ_TYPE_BLOCK_PC; 1042 rq->timeout = SD_TIMEOUT; 1043 rq->retries = SD_MAX_RETRIES; 1044 rq->cmd[0] = SYNCHRONIZE_CACHE; 1045 rq->cmd_len = 10; 1046 } 1047 1048 static void sd_rescan(struct device *dev) 1049 { 1050 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1051 1052 if (sdkp) { 1053 revalidate_disk(sdkp->disk); 1054 scsi_disk_put(sdkp); 1055 } 1056 } 1057 1058 1059 #ifdef CONFIG_COMPAT 1060 /* 1061 * This gets directly called from VFS. When the ioctl 1062 * is not recognized we go back to the other translation paths. 1063 */ 1064 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1065 unsigned int cmd, unsigned long arg) 1066 { 1067 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1068 1069 /* 1070 * If we are in the middle of error recovery, don't let anyone 1071 * else try and use this device. Also, if error recovery fails, it 1072 * may try and take the device offline, in which case all further 1073 * access to the device is prohibited. 1074 */ 1075 if (!scsi_block_when_processing_errors(sdev)) 1076 return -ENODEV; 1077 1078 if (sdev->host->hostt->compat_ioctl) { 1079 int ret; 1080 1081 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1082 1083 return ret; 1084 } 1085 1086 /* 1087 * Let the static ioctl translation table take care of it. 1088 */ 1089 return -ENOIOCTLCMD; 1090 } 1091 #endif 1092 1093 static const struct block_device_operations sd_fops = { 1094 .owner = THIS_MODULE, 1095 .open = sd_open, 1096 .release = sd_release, 1097 .locked_ioctl = sd_ioctl, 1098 .getgeo = sd_getgeo, 1099 #ifdef CONFIG_COMPAT 1100 .compat_ioctl = sd_compat_ioctl, 1101 #endif 1102 .media_changed = sd_media_changed, 1103 .revalidate_disk = sd_revalidate_disk, 1104 }; 1105 1106 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1107 { 1108 u64 start_lba = blk_rq_pos(scmd->request); 1109 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); 1110 u64 bad_lba; 1111 int info_valid; 1112 1113 if (!blk_fs_request(scmd->request)) 1114 return 0; 1115 1116 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 1117 SCSI_SENSE_BUFFERSIZE, 1118 &bad_lba); 1119 if (!info_valid) 1120 return 0; 1121 1122 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 1123 return 0; 1124 1125 if (scmd->device->sector_size < 512) { 1126 /* only legitimate sector_size here is 256 */ 1127 start_lba <<= 1; 1128 end_lba <<= 1; 1129 } else { 1130 /* be careful ... don't want any overflows */ 1131 u64 factor = scmd->device->sector_size / 512; 1132 do_div(start_lba, factor); 1133 do_div(end_lba, factor); 1134 } 1135 1136 /* The bad lba was reported incorrectly, we have no idea where 1137 * the error is. 1138 */ 1139 if (bad_lba < start_lba || bad_lba >= end_lba) 1140 return 0; 1141 1142 /* This computation should always be done in terms of 1143 * the resolution of the device's medium. 1144 */ 1145 return (bad_lba - start_lba) * scmd->device->sector_size; 1146 } 1147 1148 /** 1149 * sd_done - bottom half handler: called when the lower level 1150 * driver has completed (successfully or otherwise) a scsi command. 1151 * @SCpnt: mid-level's per command structure. 1152 * 1153 * Note: potentially run from within an ISR. Must not block. 1154 **/ 1155 static int sd_done(struct scsi_cmnd *SCpnt) 1156 { 1157 int result = SCpnt->result; 1158 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1159 struct scsi_sense_hdr sshdr; 1160 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1161 int sense_valid = 0; 1162 int sense_deferred = 0; 1163 1164 if (result) { 1165 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1166 if (sense_valid) 1167 sense_deferred = scsi_sense_is_deferred(&sshdr); 1168 } 1169 #ifdef CONFIG_SCSI_LOGGING 1170 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 1171 if (sense_valid) { 1172 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1173 "sd_done: sb[respc,sk,asc," 1174 "ascq]=%x,%x,%x,%x\n", 1175 sshdr.response_code, 1176 sshdr.sense_key, sshdr.asc, 1177 sshdr.ascq)); 1178 } 1179 #endif 1180 if (driver_byte(result) != DRIVER_SENSE && 1181 (!sense_valid || sense_deferred)) 1182 goto out; 1183 1184 switch (sshdr.sense_key) { 1185 case HARDWARE_ERROR: 1186 case MEDIUM_ERROR: 1187 good_bytes = sd_completed_bytes(SCpnt); 1188 break; 1189 case RECOVERED_ERROR: 1190 good_bytes = scsi_bufflen(SCpnt); 1191 break; 1192 case NO_SENSE: 1193 /* This indicates a false check condition, so ignore it. An 1194 * unknown amount of data was transferred so treat it as an 1195 * error. 1196 */ 1197 scsi_print_sense("sd", SCpnt); 1198 SCpnt->result = 0; 1199 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1200 break; 1201 case ABORTED_COMMAND: /* DIF: Target detected corruption */ 1202 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */ 1203 if (sshdr.asc == 0x10) 1204 good_bytes = sd_completed_bytes(SCpnt); 1205 break; 1206 default: 1207 break; 1208 } 1209 out: 1210 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1211 sd_dif_complete(SCpnt, good_bytes); 1212 1213 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type) 1214 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) { 1215 1216 /* We have to print a failed command here as the 1217 * extended CDB gets freed before scsi_io_completion() 1218 * is called. 1219 */ 1220 if (result) 1221 scsi_print_command(SCpnt); 1222 1223 mempool_free(SCpnt->cmnd, sd_cdb_pool); 1224 SCpnt->cmnd = NULL; 1225 SCpnt->cmd_len = 0; 1226 } 1227 1228 return good_bytes; 1229 } 1230 1231 static int media_not_present(struct scsi_disk *sdkp, 1232 struct scsi_sense_hdr *sshdr) 1233 { 1234 1235 if (!scsi_sense_valid(sshdr)) 1236 return 0; 1237 /* not invoked for commands that could return deferred errors */ 1238 if (sshdr->sense_key != NOT_READY && 1239 sshdr->sense_key != UNIT_ATTENTION) 1240 return 0; 1241 if (sshdr->asc != 0x3A) /* medium not present */ 1242 return 0; 1243 1244 set_media_not_present(sdkp); 1245 return 1; 1246 } 1247 1248 /* 1249 * spinup disk - called only in sd_revalidate_disk() 1250 */ 1251 static void 1252 sd_spinup_disk(struct scsi_disk *sdkp) 1253 { 1254 unsigned char cmd[10]; 1255 unsigned long spintime_expire = 0; 1256 int retries, spintime; 1257 unsigned int the_result; 1258 struct scsi_sense_hdr sshdr; 1259 int sense_valid = 0; 1260 1261 spintime = 0; 1262 1263 /* Spin up drives, as required. Only do this at boot time */ 1264 /* Spinup needs to be done for module loads too. */ 1265 do { 1266 retries = 0; 1267 1268 do { 1269 cmd[0] = TEST_UNIT_READY; 1270 memset((void *) &cmd[1], 0, 9); 1271 1272 the_result = scsi_execute_req(sdkp->device, cmd, 1273 DMA_NONE, NULL, 0, 1274 &sshdr, SD_TIMEOUT, 1275 SD_MAX_RETRIES, NULL); 1276 1277 /* 1278 * If the drive has indicated to us that it 1279 * doesn't have any media in it, don't bother 1280 * with any more polling. 1281 */ 1282 if (media_not_present(sdkp, &sshdr)) 1283 return; 1284 1285 if (the_result) 1286 sense_valid = scsi_sense_valid(&sshdr); 1287 retries++; 1288 } while (retries < 3 && 1289 (!scsi_status_is_good(the_result) || 1290 ((driver_byte(the_result) & DRIVER_SENSE) && 1291 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1292 1293 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1294 /* no sense, TUR either succeeded or failed 1295 * with a status error */ 1296 if(!spintime && !scsi_status_is_good(the_result)) { 1297 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1298 sd_print_result(sdkp, the_result); 1299 } 1300 break; 1301 } 1302 1303 /* 1304 * The device does not want the automatic start to be issued. 1305 */ 1306 if (sdkp->device->no_start_on_add) 1307 break; 1308 1309 if (sense_valid && sshdr.sense_key == NOT_READY) { 1310 if (sshdr.asc == 4 && sshdr.ascq == 3) 1311 break; /* manual intervention required */ 1312 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 1313 break; /* standby */ 1314 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 1315 break; /* unavailable */ 1316 /* 1317 * Issue command to spin up drive when not ready 1318 */ 1319 if (!spintime) { 1320 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1321 cmd[0] = START_STOP; 1322 cmd[1] = 1; /* Return immediately */ 1323 memset((void *) &cmd[2], 0, 8); 1324 cmd[4] = 1; /* Start spin cycle */ 1325 if (sdkp->device->start_stop_pwr_cond) 1326 cmd[4] |= 1 << 4; 1327 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1328 NULL, 0, &sshdr, 1329 SD_TIMEOUT, SD_MAX_RETRIES, 1330 NULL); 1331 spintime_expire = jiffies + 100 * HZ; 1332 spintime = 1; 1333 } 1334 /* Wait 1 second for next try */ 1335 msleep(1000); 1336 printk("."); 1337 1338 /* 1339 * Wait for USB flash devices with slow firmware. 1340 * Yes, this sense key/ASC combination shouldn't 1341 * occur here. It's characteristic of these devices. 1342 */ 1343 } else if (sense_valid && 1344 sshdr.sense_key == UNIT_ATTENTION && 1345 sshdr.asc == 0x28) { 1346 if (!spintime) { 1347 spintime_expire = jiffies + 5 * HZ; 1348 spintime = 1; 1349 } 1350 /* Wait 1 second for next try */ 1351 msleep(1000); 1352 } else { 1353 /* we don't understand the sense code, so it's 1354 * probably pointless to loop */ 1355 if(!spintime) { 1356 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1357 sd_print_sense_hdr(sdkp, &sshdr); 1358 } 1359 break; 1360 } 1361 1362 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1363 1364 if (spintime) { 1365 if (scsi_status_is_good(the_result)) 1366 printk("ready\n"); 1367 else 1368 printk("not responding...\n"); 1369 } 1370 } 1371 1372 1373 /* 1374 * Determine whether disk supports Data Integrity Field. 1375 */ 1376 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1377 { 1378 struct scsi_device *sdp = sdkp->device; 1379 u8 type; 1380 1381 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1382 return; 1383 1384 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1385 1386 if (type == sdkp->protection_type || !sdkp->first_scan) 1387 return; 1388 1389 sdkp->protection_type = type; 1390 1391 if (type > SD_DIF_TYPE3_PROTECTION) { 1392 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \ 1393 "protection type %u. Disabling disk!\n", type); 1394 sdkp->capacity = 0; 1395 return; 1396 } 1397 1398 if (scsi_host_dif_capable(sdp->host, type)) 1399 sd_printk(KERN_NOTICE, sdkp, 1400 "Enabling DIF Type %u protection\n", type); 1401 else 1402 sd_printk(KERN_NOTICE, sdkp, 1403 "Disabling DIF Type %u protection\n", type); 1404 } 1405 1406 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 1407 struct scsi_sense_hdr *sshdr, int sense_valid, 1408 int the_result) 1409 { 1410 sd_print_result(sdkp, the_result); 1411 if (driver_byte(the_result) & DRIVER_SENSE) 1412 sd_print_sense_hdr(sdkp, sshdr); 1413 else 1414 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1415 1416 /* 1417 * Set dirty bit for removable devices if not ready - 1418 * sometimes drives will not report this properly. 1419 */ 1420 if (sdp->removable && 1421 sense_valid && sshdr->sense_key == NOT_READY) 1422 sdp->changed = 1; 1423 1424 /* 1425 * We used to set media_present to 0 here to indicate no media 1426 * in the drive, but some drives fail read capacity even with 1427 * media present, so we can't do that. 1428 */ 1429 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1430 } 1431 1432 #define RC16_LEN 32 1433 #if RC16_LEN > SD_BUF_SIZE 1434 #error RC16_LEN must not be more than SD_BUF_SIZE 1435 #endif 1436 1437 #define READ_CAPACITY_RETRIES_ON_RESET 10 1438 1439 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 1440 unsigned char *buffer) 1441 { 1442 unsigned char cmd[16]; 1443 struct scsi_sense_hdr sshdr; 1444 int sense_valid = 0; 1445 int the_result; 1446 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1447 unsigned int alignment; 1448 unsigned long long lba; 1449 unsigned sector_size; 1450 1451 do { 1452 memset(cmd, 0, 16); 1453 cmd[0] = SERVICE_ACTION_IN; 1454 cmd[1] = SAI_READ_CAPACITY_16; 1455 cmd[13] = RC16_LEN; 1456 memset(buffer, 0, RC16_LEN); 1457 1458 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1459 buffer, RC16_LEN, &sshdr, 1460 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1461 1462 if (media_not_present(sdkp, &sshdr)) 1463 return -ENODEV; 1464 1465 if (the_result) { 1466 sense_valid = scsi_sense_valid(&sshdr); 1467 if (sense_valid && 1468 sshdr.sense_key == ILLEGAL_REQUEST && 1469 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 1470 sshdr.ascq == 0x00) 1471 /* Invalid Command Operation Code or 1472 * Invalid Field in CDB, just retry 1473 * silently with RC10 */ 1474 return -EINVAL; 1475 if (sense_valid && 1476 sshdr.sense_key == UNIT_ATTENTION && 1477 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1478 /* Device reset might occur several times, 1479 * give it one more chance */ 1480 if (--reset_retries > 0) 1481 continue; 1482 } 1483 retries--; 1484 1485 } while (the_result && retries); 1486 1487 if (the_result) { 1488 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1489 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1490 return -EINVAL; 1491 } 1492 1493 sector_size = get_unaligned_be32(&buffer[8]); 1494 lba = get_unaligned_be64(&buffer[0]); 1495 1496 sd_read_protection_type(sdkp, buffer); 1497 1498 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { 1499 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1500 "kernel compiled with support for large block " 1501 "devices.\n"); 1502 sdkp->capacity = 0; 1503 return -EOVERFLOW; 1504 } 1505 1506 /* Logical blocks per physical block exponent */ 1507 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size; 1508 1509 /* Lowest aligned logical block */ 1510 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 1511 blk_queue_alignment_offset(sdp->request_queue, alignment); 1512 if (alignment && sdkp->first_scan) 1513 sd_printk(KERN_NOTICE, sdkp, 1514 "physical block alignment offset: %u\n", alignment); 1515 1516 if (buffer[14] & 0x80) { /* TPE */ 1517 struct request_queue *q = sdp->request_queue; 1518 1519 sdkp->thin_provisioning = 1; 1520 q->limits.discard_granularity = sdkp->hw_sector_size; 1521 q->limits.max_discard_sectors = 0xffffffff; 1522 1523 if (buffer[14] & 0x40) /* TPRZ */ 1524 q->limits.discard_zeroes_data = 1; 1525 1526 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); 1527 } 1528 1529 sdkp->capacity = lba + 1; 1530 return sector_size; 1531 } 1532 1533 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 1534 unsigned char *buffer) 1535 { 1536 unsigned char cmd[16]; 1537 struct scsi_sense_hdr sshdr; 1538 int sense_valid = 0; 1539 int the_result; 1540 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1541 sector_t lba; 1542 unsigned sector_size; 1543 1544 do { 1545 cmd[0] = READ_CAPACITY; 1546 memset(&cmd[1], 0, 9); 1547 memset(buffer, 0, 8); 1548 1549 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1550 buffer, 8, &sshdr, 1551 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1552 1553 if (media_not_present(sdkp, &sshdr)) 1554 return -ENODEV; 1555 1556 if (the_result) { 1557 sense_valid = scsi_sense_valid(&sshdr); 1558 if (sense_valid && 1559 sshdr.sense_key == UNIT_ATTENTION && 1560 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1561 /* Device reset might occur several times, 1562 * give it one more chance */ 1563 if (--reset_retries > 0) 1564 continue; 1565 } 1566 retries--; 1567 1568 } while (the_result && retries); 1569 1570 if (the_result) { 1571 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 1572 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1573 return -EINVAL; 1574 } 1575 1576 sector_size = get_unaligned_be32(&buffer[4]); 1577 lba = get_unaligned_be32(&buffer[0]); 1578 1579 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { 1580 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1581 "kernel compiled with support for large block " 1582 "devices.\n"); 1583 sdkp->capacity = 0; 1584 return -EOVERFLOW; 1585 } 1586 1587 sdkp->capacity = lba + 1; 1588 sdkp->hw_sector_size = sector_size; 1589 return sector_size; 1590 } 1591 1592 static int sd_try_rc16_first(struct scsi_device *sdp) 1593 { 1594 if (sdp->host->max_cmd_len < 16) 1595 return 0; 1596 if (sdp->scsi_level > SCSI_SPC_2) 1597 return 1; 1598 if (scsi_device_protection(sdp)) 1599 return 1; 1600 return 0; 1601 } 1602 1603 /* 1604 * read disk capacity 1605 */ 1606 static void 1607 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 1608 { 1609 int sector_size; 1610 struct scsi_device *sdp = sdkp->device; 1611 sector_t old_capacity = sdkp->capacity; 1612 1613 if (sd_try_rc16_first(sdp)) { 1614 sector_size = read_capacity_16(sdkp, sdp, buffer); 1615 if (sector_size == -EOVERFLOW) 1616 goto got_data; 1617 if (sector_size == -ENODEV) 1618 return; 1619 if (sector_size < 0) 1620 sector_size = read_capacity_10(sdkp, sdp, buffer); 1621 if (sector_size < 0) 1622 return; 1623 } else { 1624 sector_size = read_capacity_10(sdkp, sdp, buffer); 1625 if (sector_size == -EOVERFLOW) 1626 goto got_data; 1627 if (sector_size < 0) 1628 return; 1629 if ((sizeof(sdkp->capacity) > 4) && 1630 (sdkp->capacity > 0xffffffffULL)) { 1631 int old_sector_size = sector_size; 1632 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 1633 "Trying to use READ CAPACITY(16).\n"); 1634 sector_size = read_capacity_16(sdkp, sdp, buffer); 1635 if (sector_size < 0) { 1636 sd_printk(KERN_NOTICE, sdkp, 1637 "Using 0xffffffff as device size\n"); 1638 sdkp->capacity = 1 + (sector_t) 0xffffffff; 1639 sector_size = old_sector_size; 1640 goto got_data; 1641 } 1642 } 1643 } 1644 1645 /* Some devices are known to return the total number of blocks, 1646 * not the highest block number. Some devices have versions 1647 * which do this and others which do not. Some devices we might 1648 * suspect of doing this but we don't know for certain. 1649 * 1650 * If we know the reported capacity is wrong, decrement it. If 1651 * we can only guess, then assume the number of blocks is even 1652 * (usually true but not always) and err on the side of lowering 1653 * the capacity. 1654 */ 1655 if (sdp->fix_capacity || 1656 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 1657 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 1658 "from its reported value: %llu\n", 1659 (unsigned long long) sdkp->capacity); 1660 --sdkp->capacity; 1661 } 1662 1663 got_data: 1664 if (sector_size == 0) { 1665 sector_size = 512; 1666 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 1667 "assuming 512.\n"); 1668 } 1669 1670 if (sector_size != 512 && 1671 sector_size != 1024 && 1672 sector_size != 2048 && 1673 sector_size != 4096 && 1674 sector_size != 256) { 1675 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 1676 sector_size); 1677 /* 1678 * The user might want to re-format the drive with 1679 * a supported sectorsize. Once this happens, it 1680 * would be relatively trivial to set the thing up. 1681 * For this reason, we leave the thing in the table. 1682 */ 1683 sdkp->capacity = 0; 1684 /* 1685 * set a bogus sector size so the normal read/write 1686 * logic in the block layer will eventually refuse any 1687 * request on this device without tripping over power 1688 * of two sector size assumptions 1689 */ 1690 sector_size = 512; 1691 } 1692 blk_queue_logical_block_size(sdp->request_queue, sector_size); 1693 1694 { 1695 char cap_str_2[10], cap_str_10[10]; 1696 u64 sz = (u64)sdkp->capacity << ilog2(sector_size); 1697 1698 string_get_size(sz, STRING_UNITS_2, cap_str_2, 1699 sizeof(cap_str_2)); 1700 string_get_size(sz, STRING_UNITS_10, cap_str_10, 1701 sizeof(cap_str_10)); 1702 1703 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 1704 sd_printk(KERN_NOTICE, sdkp, 1705 "%llu %d-byte logical blocks: (%s/%s)\n", 1706 (unsigned long long)sdkp->capacity, 1707 sector_size, cap_str_10, cap_str_2); 1708 1709 if (sdkp->hw_sector_size != sector_size) 1710 sd_printk(KERN_NOTICE, sdkp, 1711 "%u-byte physical blocks\n", 1712 sdkp->hw_sector_size); 1713 } 1714 } 1715 1716 /* Rescale capacity to 512-byte units */ 1717 if (sector_size == 4096) 1718 sdkp->capacity <<= 3; 1719 else if (sector_size == 2048) 1720 sdkp->capacity <<= 2; 1721 else if (sector_size == 1024) 1722 sdkp->capacity <<= 1; 1723 else if (sector_size == 256) 1724 sdkp->capacity >>= 1; 1725 1726 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size); 1727 sdkp->device->sector_size = sector_size; 1728 } 1729 1730 /* called with buffer of length 512 */ 1731 static inline int 1732 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 1733 unsigned char *buffer, int len, struct scsi_mode_data *data, 1734 struct scsi_sense_hdr *sshdr) 1735 { 1736 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 1737 SD_TIMEOUT, SD_MAX_RETRIES, data, 1738 sshdr); 1739 } 1740 1741 /* 1742 * read write protect setting, if possible - called only in sd_revalidate_disk() 1743 * called with buffer of length SD_BUF_SIZE 1744 */ 1745 static void 1746 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 1747 { 1748 int res; 1749 struct scsi_device *sdp = sdkp->device; 1750 struct scsi_mode_data data; 1751 int old_wp = sdkp->write_prot; 1752 1753 set_disk_ro(sdkp->disk, 0); 1754 if (sdp->skip_ms_page_3f) { 1755 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 1756 return; 1757 } 1758 1759 if (sdp->use_192_bytes_for_3f) { 1760 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 1761 } else { 1762 /* 1763 * First attempt: ask for all pages (0x3F), but only 4 bytes. 1764 * We have to start carefully: some devices hang if we ask 1765 * for more than is available. 1766 */ 1767 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 1768 1769 /* 1770 * Second attempt: ask for page 0 When only page 0 is 1771 * implemented, a request for page 3F may return Sense Key 1772 * 5: Illegal Request, Sense Code 24: Invalid field in 1773 * CDB. 1774 */ 1775 if (!scsi_status_is_good(res)) 1776 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 1777 1778 /* 1779 * Third attempt: ask 255 bytes, as we did earlier. 1780 */ 1781 if (!scsi_status_is_good(res)) 1782 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 1783 &data, NULL); 1784 } 1785 1786 if (!scsi_status_is_good(res)) { 1787 sd_printk(KERN_WARNING, sdkp, 1788 "Test WP failed, assume Write Enabled\n"); 1789 } else { 1790 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 1791 set_disk_ro(sdkp->disk, sdkp->write_prot); 1792 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 1793 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 1794 sdkp->write_prot ? "on" : "off"); 1795 sd_printk(KERN_DEBUG, sdkp, 1796 "Mode Sense: %02x %02x %02x %02x\n", 1797 buffer[0], buffer[1], buffer[2], buffer[3]); 1798 } 1799 } 1800 } 1801 1802 /* 1803 * sd_read_cache_type - called only from sd_revalidate_disk() 1804 * called with buffer of length SD_BUF_SIZE 1805 */ 1806 static void 1807 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 1808 { 1809 int len = 0, res; 1810 struct scsi_device *sdp = sdkp->device; 1811 1812 int dbd; 1813 int modepage; 1814 struct scsi_mode_data data; 1815 struct scsi_sense_hdr sshdr; 1816 int old_wce = sdkp->WCE; 1817 int old_rcd = sdkp->RCD; 1818 int old_dpofua = sdkp->DPOFUA; 1819 1820 if (sdp->skip_ms_page_8) 1821 goto defaults; 1822 1823 if (sdp->type == TYPE_RBC) { 1824 modepage = 6; 1825 dbd = 8; 1826 } else { 1827 modepage = 8; 1828 dbd = 0; 1829 } 1830 1831 /* cautiously ask */ 1832 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); 1833 1834 if (!scsi_status_is_good(res)) 1835 goto bad_sense; 1836 1837 if (!data.header_length) { 1838 modepage = 6; 1839 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 1840 } 1841 1842 /* that went OK, now ask for the proper length */ 1843 len = data.length; 1844 1845 /* 1846 * We're only interested in the first three bytes, actually. 1847 * But the data cache page is defined for the first 20. 1848 */ 1849 if (len < 3) 1850 goto bad_sense; 1851 if (len > 20) 1852 len = 20; 1853 1854 /* Take headers and block descriptors into account */ 1855 len += data.header_length + data.block_descriptor_length; 1856 if (len > SD_BUF_SIZE) 1857 goto bad_sense; 1858 1859 /* Get the data */ 1860 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); 1861 1862 if (scsi_status_is_good(res)) { 1863 int offset = data.header_length + data.block_descriptor_length; 1864 1865 if (offset >= SD_BUF_SIZE - 2) { 1866 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); 1867 goto defaults; 1868 } 1869 1870 if ((buffer[offset] & 0x3f) != modepage) { 1871 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 1872 goto defaults; 1873 } 1874 1875 if (modepage == 8) { 1876 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 1877 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 1878 } else { 1879 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 1880 sdkp->RCD = 0; 1881 } 1882 1883 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 1884 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 1885 sd_printk(KERN_NOTICE, sdkp, 1886 "Uses READ/WRITE(6), disabling FUA\n"); 1887 sdkp->DPOFUA = 0; 1888 } 1889 1890 if (sdkp->first_scan || old_wce != sdkp->WCE || 1891 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 1892 sd_printk(KERN_NOTICE, sdkp, 1893 "Write cache: %s, read cache: %s, %s\n", 1894 sdkp->WCE ? "enabled" : "disabled", 1895 sdkp->RCD ? "disabled" : "enabled", 1896 sdkp->DPOFUA ? "supports DPO and FUA" 1897 : "doesn't support DPO or FUA"); 1898 1899 return; 1900 } 1901 1902 bad_sense: 1903 if (scsi_sense_valid(&sshdr) && 1904 sshdr.sense_key == ILLEGAL_REQUEST && 1905 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 1906 /* Invalid field in CDB */ 1907 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 1908 else 1909 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 1910 1911 defaults: 1912 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 1913 sdkp->WCE = 0; 1914 sdkp->RCD = 0; 1915 sdkp->DPOFUA = 0; 1916 } 1917 1918 /* 1919 * The ATO bit indicates whether the DIF application tag is available 1920 * for use by the operating system. 1921 */ 1922 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 1923 { 1924 int res, offset; 1925 struct scsi_device *sdp = sdkp->device; 1926 struct scsi_mode_data data; 1927 struct scsi_sense_hdr sshdr; 1928 1929 if (sdp->type != TYPE_DISK) 1930 return; 1931 1932 if (sdkp->protection_type == 0) 1933 return; 1934 1935 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 1936 SD_MAX_RETRIES, &data, &sshdr); 1937 1938 if (!scsi_status_is_good(res) || !data.header_length || 1939 data.length < 6) { 1940 sd_printk(KERN_WARNING, sdkp, 1941 "getting Control mode page failed, assume no ATO\n"); 1942 1943 if (scsi_sense_valid(&sshdr)) 1944 sd_print_sense_hdr(sdkp, &sshdr); 1945 1946 return; 1947 } 1948 1949 offset = data.header_length + data.block_descriptor_length; 1950 1951 if ((buffer[offset] & 0x3f) != 0x0a) { 1952 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 1953 return; 1954 } 1955 1956 if ((buffer[offset + 5] & 0x80) == 0) 1957 return; 1958 1959 sdkp->ATO = 1; 1960 1961 return; 1962 } 1963 1964 /** 1965 * sd_read_block_limits - Query disk device for preferred I/O sizes. 1966 * @disk: disk to query 1967 */ 1968 static void sd_read_block_limits(struct scsi_disk *sdkp) 1969 { 1970 struct request_queue *q = sdkp->disk->queue; 1971 unsigned int sector_sz = sdkp->device->sector_size; 1972 const int vpd_len = 64; 1973 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 1974 1975 if (!buffer || 1976 /* Block Limits VPD */ 1977 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 1978 goto out; 1979 1980 blk_queue_io_min(sdkp->disk->queue, 1981 get_unaligned_be16(&buffer[6]) * sector_sz); 1982 blk_queue_io_opt(sdkp->disk->queue, 1983 get_unaligned_be32(&buffer[12]) * sector_sz); 1984 1985 /* Thin provisioning enabled and page length indicates TP support */ 1986 if (sdkp->thin_provisioning && buffer[3] == 0x3c) { 1987 unsigned int lba_count, desc_count, granularity; 1988 1989 lba_count = get_unaligned_be32(&buffer[20]); 1990 desc_count = get_unaligned_be32(&buffer[24]); 1991 1992 if (lba_count) { 1993 q->limits.max_discard_sectors = 1994 lba_count * sector_sz >> 9; 1995 1996 if (desc_count) 1997 sdkp->unmap = 1; 1998 } 1999 2000 granularity = get_unaligned_be32(&buffer[28]); 2001 2002 if (granularity) 2003 q->limits.discard_granularity = granularity * sector_sz; 2004 2005 if (buffer[32] & 0x80) 2006 q->limits.discard_alignment = 2007 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 2008 } 2009 2010 out: 2011 kfree(buffer); 2012 } 2013 2014 /** 2015 * sd_read_block_characteristics - Query block dev. characteristics 2016 * @disk: disk to query 2017 */ 2018 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2019 { 2020 unsigned char *buffer; 2021 u16 rot; 2022 const int vpd_len = 64; 2023 2024 buffer = kmalloc(vpd_len, GFP_KERNEL); 2025 2026 if (!buffer || 2027 /* Block Device Characteristics VPD */ 2028 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2029 goto out; 2030 2031 rot = get_unaligned_be16(&buffer[4]); 2032 2033 if (rot == 1) 2034 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); 2035 2036 out: 2037 kfree(buffer); 2038 } 2039 2040 static int sd_try_extended_inquiry(struct scsi_device *sdp) 2041 { 2042 /* 2043 * Although VPD inquiries can go to SCSI-2 type devices, 2044 * some USB ones crash on receiving them, and the pages 2045 * we currently ask for are for SPC-3 and beyond 2046 */ 2047 if (sdp->scsi_level > SCSI_SPC_2) 2048 return 1; 2049 return 0; 2050 } 2051 2052 /** 2053 * sd_revalidate_disk - called the first time a new disk is seen, 2054 * performs disk spin up, read_capacity, etc. 2055 * @disk: struct gendisk we care about 2056 **/ 2057 static int sd_revalidate_disk(struct gendisk *disk) 2058 { 2059 struct scsi_disk *sdkp = scsi_disk(disk); 2060 struct scsi_device *sdp = sdkp->device; 2061 unsigned char *buffer; 2062 unsigned ordered; 2063 2064 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 2065 "sd_revalidate_disk\n")); 2066 2067 /* 2068 * If the device is offline, don't try and read capacity or any 2069 * of the other niceties. 2070 */ 2071 if (!scsi_device_online(sdp)) 2072 goto out; 2073 2074 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 2075 if (!buffer) { 2076 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 2077 "allocation failure.\n"); 2078 goto out; 2079 } 2080 2081 sd_spinup_disk(sdkp); 2082 2083 /* 2084 * Without media there is no reason to ask; moreover, some devices 2085 * react badly if we do. 2086 */ 2087 if (sdkp->media_present) { 2088 sd_read_capacity(sdkp, buffer); 2089 2090 if (sd_try_extended_inquiry(sdp)) { 2091 sd_read_block_limits(sdkp); 2092 sd_read_block_characteristics(sdkp); 2093 } 2094 2095 sd_read_write_protect_flag(sdkp, buffer); 2096 sd_read_cache_type(sdkp, buffer); 2097 sd_read_app_tag_own(sdkp, buffer); 2098 } 2099 2100 sdkp->first_scan = 0; 2101 2102 /* 2103 * We now have all cache related info, determine how we deal 2104 * with ordered requests. Note that as the current SCSI 2105 * dispatch function can alter request order, we cannot use 2106 * QUEUE_ORDERED_TAG_* even when ordered tag is supported. 2107 */ 2108 if (sdkp->WCE) 2109 ordered = sdkp->DPOFUA 2110 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; 2111 else 2112 ordered = QUEUE_ORDERED_DRAIN; 2113 2114 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); 2115 2116 set_capacity(disk, sdkp->capacity); 2117 kfree(buffer); 2118 2119 out: 2120 return 0; 2121 } 2122 2123 /** 2124 * sd_format_disk_name - format disk name 2125 * @prefix: name prefix - ie. "sd" for SCSI disks 2126 * @index: index of the disk to format name for 2127 * @buf: output buffer 2128 * @buflen: length of the output buffer 2129 * 2130 * SCSI disk names starts at sda. The 26th device is sdz and the 2131 * 27th is sdaa. The last one for two lettered suffix is sdzz 2132 * which is followed by sdaaa. 2133 * 2134 * This is basically 26 base counting with one extra 'nil' entry 2135 * at the beginning from the second digit on and can be 2136 * determined using similar method as 26 base conversion with the 2137 * index shifted -1 after each digit is computed. 2138 * 2139 * CONTEXT: 2140 * Don't care. 2141 * 2142 * RETURNS: 2143 * 0 on success, -errno on failure. 2144 */ 2145 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 2146 { 2147 const int base = 'z' - 'a' + 1; 2148 char *begin = buf + strlen(prefix); 2149 char *end = buf + buflen; 2150 char *p; 2151 int unit; 2152 2153 p = end - 1; 2154 *p = '\0'; 2155 unit = base; 2156 do { 2157 if (p == begin) 2158 return -EINVAL; 2159 *--p = 'a' + (index % unit); 2160 index = (index / unit) - 1; 2161 } while (index >= 0); 2162 2163 memmove(begin, p, end - p); 2164 memcpy(buf, prefix, strlen(prefix)); 2165 2166 return 0; 2167 } 2168 2169 /* 2170 * The asynchronous part of sd_probe 2171 */ 2172 static void sd_probe_async(void *data, async_cookie_t cookie) 2173 { 2174 struct scsi_disk *sdkp = data; 2175 struct scsi_device *sdp; 2176 struct gendisk *gd; 2177 u32 index; 2178 struct device *dev; 2179 2180 sdp = sdkp->device; 2181 gd = sdkp->disk; 2182 index = sdkp->index; 2183 dev = &sdp->sdev_gendev; 2184 2185 if (index < SD_MAX_DISKS) { 2186 gd->major = sd_major((index & 0xf0) >> 4); 2187 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 2188 gd->minors = SD_MINORS; 2189 } 2190 gd->fops = &sd_fops; 2191 gd->private_data = &sdkp->driver; 2192 gd->queue = sdkp->device->request_queue; 2193 2194 /* defaults, until the device tells us otherwise */ 2195 sdp->sector_size = 512; 2196 sdkp->capacity = 0; 2197 sdkp->media_present = 1; 2198 sdkp->write_prot = 0; 2199 sdkp->WCE = 0; 2200 sdkp->RCD = 0; 2201 sdkp->ATO = 0; 2202 sdkp->first_scan = 1; 2203 2204 sd_revalidate_disk(gd); 2205 2206 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); 2207 2208 gd->driverfs_dev = &sdp->sdev_gendev; 2209 gd->flags = GENHD_FL_EXT_DEVT; 2210 if (sdp->removable) 2211 gd->flags |= GENHD_FL_REMOVABLE; 2212 2213 dev_set_drvdata(dev, sdkp); 2214 add_disk(gd); 2215 sd_dif_config_host(sdkp); 2216 2217 sd_revalidate_disk(gd); 2218 2219 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 2220 sdp->removable ? "removable " : ""); 2221 put_device(&sdkp->dev); 2222 } 2223 2224 /** 2225 * sd_probe - called during driver initialization and whenever a 2226 * new scsi device is attached to the system. It is called once 2227 * for each scsi device (not just disks) present. 2228 * @dev: pointer to device object 2229 * 2230 * Returns 0 if successful (or not interested in this scsi device 2231 * (e.g. scanner)); 1 when there is an error. 2232 * 2233 * Note: this function is invoked from the scsi mid-level. 2234 * This function sets up the mapping between a given 2235 * <host,channel,id,lun> (found in sdp) and new device name 2236 * (e.g. /dev/sda). More precisely it is the block device major 2237 * and minor number that is chosen here. 2238 * 2239 * Assume sd_attach is not re-entrant (for time being) 2240 * Also think about sd_attach() and sd_remove() running coincidentally. 2241 **/ 2242 static int sd_probe(struct device *dev) 2243 { 2244 struct scsi_device *sdp = to_scsi_device(dev); 2245 struct scsi_disk *sdkp; 2246 struct gendisk *gd; 2247 u32 index; 2248 int error; 2249 2250 error = -ENODEV; 2251 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 2252 goto out; 2253 2254 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 2255 "sd_attach\n")); 2256 2257 error = -ENOMEM; 2258 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 2259 if (!sdkp) 2260 goto out; 2261 2262 gd = alloc_disk(SD_MINORS); 2263 if (!gd) 2264 goto out_free; 2265 2266 do { 2267 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 2268 goto out_put; 2269 2270 spin_lock(&sd_index_lock); 2271 error = ida_get_new(&sd_index_ida, &index); 2272 spin_unlock(&sd_index_lock); 2273 } while (error == -EAGAIN); 2274 2275 if (error) 2276 goto out_put; 2277 2278 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 2279 if (error) 2280 goto out_free_index; 2281 2282 sdkp->device = sdp; 2283 sdkp->driver = &sd_template; 2284 sdkp->disk = gd; 2285 sdkp->index = index; 2286 sdkp->openers = 0; 2287 sdkp->previous_state = 1; 2288 2289 if (!sdp->request_queue->rq_timeout) { 2290 if (sdp->type != TYPE_MOD) 2291 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 2292 else 2293 blk_queue_rq_timeout(sdp->request_queue, 2294 SD_MOD_TIMEOUT); 2295 } 2296 2297 device_initialize(&sdkp->dev); 2298 sdkp->dev.parent = &sdp->sdev_gendev; 2299 sdkp->dev.class = &sd_disk_class; 2300 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev)); 2301 2302 if (device_add(&sdkp->dev)) 2303 goto out_free_index; 2304 2305 get_device(&sdp->sdev_gendev); 2306 2307 get_device(&sdkp->dev); /* prevent release before async_schedule */ 2308 async_schedule(sd_probe_async, sdkp); 2309 2310 return 0; 2311 2312 out_free_index: 2313 spin_lock(&sd_index_lock); 2314 ida_remove(&sd_index_ida, index); 2315 spin_unlock(&sd_index_lock); 2316 out_put: 2317 put_disk(gd); 2318 out_free: 2319 kfree(sdkp); 2320 out: 2321 return error; 2322 } 2323 2324 /** 2325 * sd_remove - called whenever a scsi disk (previously recognized by 2326 * sd_probe) is detached from the system. It is called (potentially 2327 * multiple times) during sd module unload. 2328 * @sdp: pointer to mid level scsi device object 2329 * 2330 * Note: this function is invoked from the scsi mid-level. 2331 * This function potentially frees up a device name (e.g. /dev/sdc) 2332 * that could be re-used by a subsequent sd_probe(). 2333 * This function is not called when the built-in sd driver is "exit-ed". 2334 **/ 2335 static int sd_remove(struct device *dev) 2336 { 2337 struct scsi_disk *sdkp; 2338 2339 async_synchronize_full(); 2340 sdkp = dev_get_drvdata(dev); 2341 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); 2342 device_del(&sdkp->dev); 2343 del_gendisk(sdkp->disk); 2344 sd_shutdown(dev); 2345 2346 mutex_lock(&sd_ref_mutex); 2347 dev_set_drvdata(dev, NULL); 2348 put_device(&sdkp->dev); 2349 mutex_unlock(&sd_ref_mutex); 2350 2351 return 0; 2352 } 2353 2354 /** 2355 * scsi_disk_release - Called to free the scsi_disk structure 2356 * @dev: pointer to embedded class device 2357 * 2358 * sd_ref_mutex must be held entering this routine. Because it is 2359 * called on last put, you should always use the scsi_disk_get() 2360 * scsi_disk_put() helpers which manipulate the semaphore directly 2361 * and never do a direct put_device. 2362 **/ 2363 static void scsi_disk_release(struct device *dev) 2364 { 2365 struct scsi_disk *sdkp = to_scsi_disk(dev); 2366 struct gendisk *disk = sdkp->disk; 2367 2368 spin_lock(&sd_index_lock); 2369 ida_remove(&sd_index_ida, sdkp->index); 2370 spin_unlock(&sd_index_lock); 2371 2372 disk->private_data = NULL; 2373 put_disk(disk); 2374 put_device(&sdkp->device->sdev_gendev); 2375 2376 kfree(sdkp); 2377 } 2378 2379 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 2380 { 2381 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 2382 struct scsi_sense_hdr sshdr; 2383 struct scsi_device *sdp = sdkp->device; 2384 int res; 2385 2386 if (start) 2387 cmd[4] |= 1; /* START */ 2388 2389 if (sdp->start_stop_pwr_cond) 2390 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 2391 2392 if (!scsi_device_online(sdp)) 2393 return -ENODEV; 2394 2395 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 2396 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2397 if (res) { 2398 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 2399 sd_print_result(sdkp, res); 2400 if (driver_byte(res) & DRIVER_SENSE) 2401 sd_print_sense_hdr(sdkp, &sshdr); 2402 } 2403 2404 return res; 2405 } 2406 2407 /* 2408 * Send a SYNCHRONIZE CACHE instruction down to the device through 2409 * the normal SCSI command structure. Wait for the command to 2410 * complete. 2411 */ 2412 static void sd_shutdown(struct device *dev) 2413 { 2414 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2415 2416 if (!sdkp) 2417 return; /* this can happen */ 2418 2419 if (sdkp->WCE) { 2420 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2421 sd_sync_cache(sdkp); 2422 } 2423 2424 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 2425 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2426 sd_start_stop_device(sdkp, 0); 2427 } 2428 2429 scsi_disk_put(sdkp); 2430 } 2431 2432 static int sd_suspend(struct device *dev, pm_message_t mesg) 2433 { 2434 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2435 int ret = 0; 2436 2437 if (!sdkp) 2438 return 0; /* this can happen */ 2439 2440 if (sdkp->WCE) { 2441 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2442 ret = sd_sync_cache(sdkp); 2443 if (ret) 2444 goto done; 2445 } 2446 2447 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { 2448 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2449 ret = sd_start_stop_device(sdkp, 0); 2450 } 2451 2452 done: 2453 scsi_disk_put(sdkp); 2454 return ret; 2455 } 2456 2457 static int sd_resume(struct device *dev) 2458 { 2459 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2460 int ret = 0; 2461 2462 if (!sdkp->device->manage_start_stop) 2463 goto done; 2464 2465 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 2466 ret = sd_start_stop_device(sdkp, 1); 2467 2468 done: 2469 scsi_disk_put(sdkp); 2470 return ret; 2471 } 2472 2473 /** 2474 * init_sd - entry point for this driver (both when built in or when 2475 * a module). 2476 * 2477 * Note: this function registers this driver with the scsi mid-level. 2478 **/ 2479 static int __init init_sd(void) 2480 { 2481 int majors = 0, i, err; 2482 2483 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 2484 2485 for (i = 0; i < SD_MAJORS; i++) 2486 if (register_blkdev(sd_major(i), "sd") == 0) 2487 majors++; 2488 2489 if (!majors) 2490 return -ENODEV; 2491 2492 err = class_register(&sd_disk_class); 2493 if (err) 2494 goto err_out; 2495 2496 err = scsi_register_driver(&sd_template.gendrv); 2497 if (err) 2498 goto err_out_class; 2499 2500 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 2501 0, 0, NULL); 2502 if (!sd_cdb_cache) { 2503 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 2504 goto err_out_class; 2505 } 2506 2507 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 2508 if (!sd_cdb_pool) { 2509 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 2510 goto err_out_cache; 2511 } 2512 2513 return 0; 2514 2515 err_out_cache: 2516 kmem_cache_destroy(sd_cdb_cache); 2517 2518 err_out_class: 2519 class_unregister(&sd_disk_class); 2520 err_out: 2521 for (i = 0; i < SD_MAJORS; i++) 2522 unregister_blkdev(sd_major(i), "sd"); 2523 return err; 2524 } 2525 2526 /** 2527 * exit_sd - exit point for this driver (when it is a module). 2528 * 2529 * Note: this function unregisters this driver from the scsi mid-level. 2530 **/ 2531 static void __exit exit_sd(void) 2532 { 2533 int i; 2534 2535 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 2536 2537 mempool_destroy(sd_cdb_pool); 2538 kmem_cache_destroy(sd_cdb_cache); 2539 2540 scsi_unregister_driver(&sd_template.gendrv); 2541 class_unregister(&sd_disk_class); 2542 2543 for (i = 0; i < SD_MAJORS; i++) 2544 unregister_blkdev(sd_major(i), "sd"); 2545 } 2546 2547 module_init(init_sd); 2548 module_exit(exit_sd); 2549 2550 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 2551 struct scsi_sense_hdr *sshdr) 2552 { 2553 sd_printk(KERN_INFO, sdkp, ""); 2554 scsi_show_sense_hdr(sshdr); 2555 sd_printk(KERN_INFO, sdkp, ""); 2556 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 2557 } 2558 2559 static void sd_print_result(struct scsi_disk *sdkp, int result) 2560 { 2561 sd_printk(KERN_INFO, sdkp, ""); 2562 scsi_show_result(result); 2563 } 2564 2565