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 <linux/pm_runtime.h> 54 #include <asm/uaccess.h> 55 #include <asm/unaligned.h> 56 57 #include <scsi/scsi.h> 58 #include <scsi/scsi_cmnd.h> 59 #include <scsi/scsi_dbg.h> 60 #include <scsi/scsi_device.h> 61 #include <scsi/scsi_driver.h> 62 #include <scsi/scsi_eh.h> 63 #include <scsi/scsi_host.h> 64 #include <scsi/scsi_ioctl.h> 65 #include <scsi/scsicam.h> 66 67 #include "sd.h" 68 #include "scsi_priv.h" 69 #include "scsi_logging.h" 70 71 MODULE_AUTHOR("Eric Youngdale"); 72 MODULE_DESCRIPTION("SCSI disk (sd) driver"); 73 MODULE_LICENSE("GPL"); 74 75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 91 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 92 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 93 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 94 95 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) 96 #define SD_MINORS 16 97 #else 98 #define SD_MINORS 0 99 #endif 100 101 static void sd_config_discard(struct scsi_disk *, unsigned int); 102 static void sd_config_write_same(struct scsi_disk *); 103 static int sd_revalidate_disk(struct gendisk *); 104 static void sd_unlock_native_capacity(struct gendisk *disk); 105 static int sd_probe(struct device *); 106 static int sd_remove(struct device *); 107 static void sd_shutdown(struct device *); 108 static int sd_suspend(struct device *); 109 static int sd_resume(struct device *); 110 static void sd_rescan(struct device *); 111 static int sd_done(struct scsi_cmnd *); 112 static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int); 113 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); 114 static void scsi_disk_release(struct device *cdev); 115 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); 116 static void sd_print_result(struct scsi_disk *, int); 117 118 static DEFINE_SPINLOCK(sd_index_lock); 119 static DEFINE_IDA(sd_index_ida); 120 121 /* This semaphore is used to mediate the 0->1 reference get in the 122 * face of object destruction (i.e. we can't allow a get on an 123 * object after last put) */ 124 static DEFINE_MUTEX(sd_ref_mutex); 125 126 static struct kmem_cache *sd_cdb_cache; 127 static mempool_t *sd_cdb_pool; 128 129 static const char *sd_cache_types[] = { 130 "write through", "none", "write back", 131 "write back, no read (daft)" 132 }; 133 134 static ssize_t 135 sd_store_cache_type(struct device *dev, struct device_attribute *attr, 136 const char *buf, size_t count) 137 { 138 int i, ct = -1, rcd, wce, sp; 139 struct scsi_disk *sdkp = to_scsi_disk(dev); 140 struct scsi_device *sdp = sdkp->device; 141 char buffer[64]; 142 char *buffer_data; 143 struct scsi_mode_data data; 144 struct scsi_sense_hdr sshdr; 145 const char *temp = "temporary "; 146 int len; 147 148 if (sdp->type != TYPE_DISK) 149 /* no cache control on RBC devices; theoretically they 150 * can do it, but there's probably so many exceptions 151 * it's not worth the risk */ 152 return -EINVAL; 153 154 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) { 155 buf += sizeof(temp) - 1; 156 sdkp->cache_override = 1; 157 } else { 158 sdkp->cache_override = 0; 159 } 160 161 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 162 len = strlen(sd_cache_types[i]); 163 if (strncmp(sd_cache_types[i], buf, len) == 0 && 164 buf[len] == '\n') { 165 ct = i; 166 break; 167 } 168 } 169 if (ct < 0) 170 return -EINVAL; 171 rcd = ct & 0x01 ? 1 : 0; 172 wce = ct & 0x02 ? 1 : 0; 173 174 if (sdkp->cache_override) { 175 sdkp->WCE = wce; 176 sdkp->RCD = rcd; 177 return count; 178 } 179 180 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 181 SD_MAX_RETRIES, &data, NULL)) 182 return -EINVAL; 183 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 184 data.block_descriptor_length); 185 buffer_data = buffer + data.header_length + 186 data.block_descriptor_length; 187 buffer_data[2] &= ~0x05; 188 buffer_data[2] |= wce << 2 | rcd; 189 sp = buffer_data[0] & 0x80 ? 1 : 0; 190 191 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 192 SD_MAX_RETRIES, &data, &sshdr)) { 193 if (scsi_sense_valid(&sshdr)) 194 sd_print_sense_hdr(sdkp, &sshdr); 195 return -EINVAL; 196 } 197 revalidate_disk(sdkp->disk); 198 return count; 199 } 200 201 static ssize_t 202 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, 203 const char *buf, size_t count) 204 { 205 struct scsi_disk *sdkp = to_scsi_disk(dev); 206 struct scsi_device *sdp = sdkp->device; 207 208 if (!capable(CAP_SYS_ADMIN)) 209 return -EACCES; 210 211 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 212 213 return count; 214 } 215 216 static ssize_t 217 sd_store_allow_restart(struct device *dev, struct device_attribute *attr, 218 const char *buf, size_t count) 219 { 220 struct scsi_disk *sdkp = to_scsi_disk(dev); 221 struct scsi_device *sdp = sdkp->device; 222 223 if (!capable(CAP_SYS_ADMIN)) 224 return -EACCES; 225 226 if (sdp->type != TYPE_DISK) 227 return -EINVAL; 228 229 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 230 231 return count; 232 } 233 234 static ssize_t 235 sd_show_cache_type(struct device *dev, struct device_attribute *attr, 236 char *buf) 237 { 238 struct scsi_disk *sdkp = to_scsi_disk(dev); 239 int ct = sdkp->RCD + 2*sdkp->WCE; 240 241 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); 242 } 243 244 static ssize_t 245 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) 246 { 247 struct scsi_disk *sdkp = to_scsi_disk(dev); 248 249 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); 250 } 251 252 static ssize_t 253 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, 254 char *buf) 255 { 256 struct scsi_disk *sdkp = to_scsi_disk(dev); 257 struct scsi_device *sdp = sdkp->device; 258 259 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); 260 } 261 262 static ssize_t 263 sd_show_allow_restart(struct device *dev, struct device_attribute *attr, 264 char *buf) 265 { 266 struct scsi_disk *sdkp = to_scsi_disk(dev); 267 268 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); 269 } 270 271 static ssize_t 272 sd_show_protection_type(struct device *dev, struct device_attribute *attr, 273 char *buf) 274 { 275 struct scsi_disk *sdkp = to_scsi_disk(dev); 276 277 return snprintf(buf, 20, "%u\n", sdkp->protection_type); 278 } 279 280 static ssize_t 281 sd_store_protection_type(struct device *dev, struct device_attribute *attr, 282 const char *buf, size_t count) 283 { 284 struct scsi_disk *sdkp = to_scsi_disk(dev); 285 unsigned int val; 286 int err; 287 288 if (!capable(CAP_SYS_ADMIN)) 289 return -EACCES; 290 291 err = kstrtouint(buf, 10, &val); 292 293 if (err) 294 return err; 295 296 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION) 297 sdkp->protection_type = val; 298 299 return count; 300 } 301 302 static ssize_t 303 sd_show_protection_mode(struct device *dev, struct device_attribute *attr, 304 char *buf) 305 { 306 struct scsi_disk *sdkp = to_scsi_disk(dev); 307 struct scsi_device *sdp = sdkp->device; 308 unsigned int dif, dix; 309 310 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 311 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type); 312 313 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) { 314 dif = 0; 315 dix = 1; 316 } 317 318 if (!dif && !dix) 319 return snprintf(buf, 20, "none\n"); 320 321 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif); 322 } 323 324 static ssize_t 325 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, 326 char *buf) 327 { 328 struct scsi_disk *sdkp = to_scsi_disk(dev); 329 330 return snprintf(buf, 20, "%u\n", sdkp->ATO); 331 } 332 333 static ssize_t 334 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr, 335 char *buf) 336 { 337 struct scsi_disk *sdkp = to_scsi_disk(dev); 338 339 return snprintf(buf, 20, "%u\n", sdkp->lbpme); 340 } 341 342 static const char *lbp_mode[] = { 343 [SD_LBP_FULL] = "full", 344 [SD_LBP_UNMAP] = "unmap", 345 [SD_LBP_WS16] = "writesame_16", 346 [SD_LBP_WS10] = "writesame_10", 347 [SD_LBP_ZERO] = "writesame_zero", 348 [SD_LBP_DISABLE] = "disabled", 349 }; 350 351 static ssize_t 352 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr, 353 char *buf) 354 { 355 struct scsi_disk *sdkp = to_scsi_disk(dev); 356 357 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]); 358 } 359 360 static ssize_t 361 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr, 362 const char *buf, size_t count) 363 { 364 struct scsi_disk *sdkp = to_scsi_disk(dev); 365 struct scsi_device *sdp = sdkp->device; 366 367 if (!capable(CAP_SYS_ADMIN)) 368 return -EACCES; 369 370 if (sdp->type != TYPE_DISK) 371 return -EINVAL; 372 373 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20)) 374 sd_config_discard(sdkp, SD_LBP_UNMAP); 375 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20)) 376 sd_config_discard(sdkp, SD_LBP_WS16); 377 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20)) 378 sd_config_discard(sdkp, SD_LBP_WS10); 379 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20)) 380 sd_config_discard(sdkp, SD_LBP_ZERO); 381 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20)) 382 sd_config_discard(sdkp, SD_LBP_DISABLE); 383 else 384 return -EINVAL; 385 386 return count; 387 } 388 389 static ssize_t 390 sd_show_max_medium_access_timeouts(struct device *dev, 391 struct device_attribute *attr, char *buf) 392 { 393 struct scsi_disk *sdkp = to_scsi_disk(dev); 394 395 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts); 396 } 397 398 static ssize_t 399 sd_store_max_medium_access_timeouts(struct device *dev, 400 struct device_attribute *attr, 401 const char *buf, size_t count) 402 { 403 struct scsi_disk *sdkp = to_scsi_disk(dev); 404 int err; 405 406 if (!capable(CAP_SYS_ADMIN)) 407 return -EACCES; 408 409 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts); 410 411 return err ? err : count; 412 } 413 414 static ssize_t 415 sd_show_write_same_blocks(struct device *dev, struct device_attribute *attr, 416 char *buf) 417 { 418 struct scsi_disk *sdkp = to_scsi_disk(dev); 419 420 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks); 421 } 422 423 static ssize_t 424 sd_store_write_same_blocks(struct device *dev, struct device_attribute *attr, 425 const char *buf, size_t count) 426 { 427 struct scsi_disk *sdkp = to_scsi_disk(dev); 428 struct scsi_device *sdp = sdkp->device; 429 unsigned long max; 430 int err; 431 432 if (!capable(CAP_SYS_ADMIN)) 433 return -EACCES; 434 435 if (sdp->type != TYPE_DISK) 436 return -EINVAL; 437 438 err = kstrtoul(buf, 10, &max); 439 440 if (err) 441 return err; 442 443 if (max == 0) 444 sdp->no_write_same = 1; 445 else if (max <= SD_MAX_WS16_BLOCKS) 446 sdkp->max_ws_blocks = max; 447 448 sd_config_write_same(sdkp); 449 450 return count; 451 } 452 453 static struct device_attribute sd_disk_attrs[] = { 454 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, 455 sd_store_cache_type), 456 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), 457 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, 458 sd_store_allow_restart), 459 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, 460 sd_store_manage_start_stop), 461 __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type, 462 sd_store_protection_type), 463 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL), 464 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), 465 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL), 466 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode, 467 sd_store_provisioning_mode), 468 __ATTR(max_write_same_blocks, S_IRUGO|S_IWUSR, 469 sd_show_write_same_blocks, sd_store_write_same_blocks), 470 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR, 471 sd_show_max_medium_access_timeouts, 472 sd_store_max_medium_access_timeouts), 473 __ATTR_NULL, 474 }; 475 476 static struct class sd_disk_class = { 477 .name = "scsi_disk", 478 .owner = THIS_MODULE, 479 .dev_release = scsi_disk_release, 480 .dev_attrs = sd_disk_attrs, 481 }; 482 483 static const struct dev_pm_ops sd_pm_ops = { 484 .suspend = sd_suspend, 485 .resume = sd_resume, 486 .poweroff = sd_suspend, 487 .restore = sd_resume, 488 .runtime_suspend = sd_suspend, 489 .runtime_resume = sd_resume, 490 }; 491 492 static struct scsi_driver sd_template = { 493 .owner = THIS_MODULE, 494 .gendrv = { 495 .name = "sd", 496 .probe = sd_probe, 497 .remove = sd_remove, 498 .shutdown = sd_shutdown, 499 .pm = &sd_pm_ops, 500 }, 501 .rescan = sd_rescan, 502 .done = sd_done, 503 .eh_action = sd_eh_action, 504 }; 505 506 /* 507 * Device no to disk mapping: 508 * 509 * major disc2 disc p1 510 * |............|.............|....|....| <- dev_t 511 * 31 20 19 8 7 4 3 0 512 * 513 * Inside a major, we have 16k disks, however mapped non- 514 * contiguously. The first 16 disks are for major0, the next 515 * ones with major1, ... Disk 256 is for major0 again, disk 272 516 * for major1, ... 517 * As we stay compatible with our numbering scheme, we can reuse 518 * the well-know SCSI majors 8, 65--71, 136--143. 519 */ 520 static int sd_major(int major_idx) 521 { 522 switch (major_idx) { 523 case 0: 524 return SCSI_DISK0_MAJOR; 525 case 1 ... 7: 526 return SCSI_DISK1_MAJOR + major_idx - 1; 527 case 8 ... 15: 528 return SCSI_DISK8_MAJOR + major_idx - 8; 529 default: 530 BUG(); 531 return 0; /* shut up gcc */ 532 } 533 } 534 535 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) 536 { 537 struct scsi_disk *sdkp = NULL; 538 539 if (disk->private_data) { 540 sdkp = scsi_disk(disk); 541 if (scsi_device_get(sdkp->device) == 0) 542 get_device(&sdkp->dev); 543 else 544 sdkp = NULL; 545 } 546 return sdkp; 547 } 548 549 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 550 { 551 struct scsi_disk *sdkp; 552 553 mutex_lock(&sd_ref_mutex); 554 sdkp = __scsi_disk_get(disk); 555 mutex_unlock(&sd_ref_mutex); 556 return sdkp; 557 } 558 559 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) 560 { 561 struct scsi_disk *sdkp; 562 563 mutex_lock(&sd_ref_mutex); 564 sdkp = dev_get_drvdata(dev); 565 if (sdkp) 566 sdkp = __scsi_disk_get(sdkp->disk); 567 mutex_unlock(&sd_ref_mutex); 568 return sdkp; 569 } 570 571 static void scsi_disk_put(struct scsi_disk *sdkp) 572 { 573 struct scsi_device *sdev = sdkp->device; 574 575 mutex_lock(&sd_ref_mutex); 576 put_device(&sdkp->dev); 577 scsi_device_put(sdev); 578 mutex_unlock(&sd_ref_mutex); 579 } 580 581 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif) 582 { 583 unsigned int prot_op = SCSI_PROT_NORMAL; 584 unsigned int dix = scsi_prot_sg_count(scmd); 585 586 if (scmd->sc_data_direction == DMA_FROM_DEVICE) { 587 if (dif && dix) 588 prot_op = SCSI_PROT_READ_PASS; 589 else if (dif && !dix) 590 prot_op = SCSI_PROT_READ_STRIP; 591 else if (!dif && dix) 592 prot_op = SCSI_PROT_READ_INSERT; 593 } else { 594 if (dif && dix) 595 prot_op = SCSI_PROT_WRITE_PASS; 596 else if (dif && !dix) 597 prot_op = SCSI_PROT_WRITE_INSERT; 598 else if (!dif && dix) 599 prot_op = SCSI_PROT_WRITE_STRIP; 600 } 601 602 scsi_set_prot_op(scmd, prot_op); 603 scsi_set_prot_type(scmd, dif); 604 } 605 606 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) 607 { 608 struct request_queue *q = sdkp->disk->queue; 609 unsigned int logical_block_size = sdkp->device->sector_size; 610 unsigned int max_blocks = 0; 611 612 q->limits.discard_zeroes_data = sdkp->lbprz; 613 q->limits.discard_alignment = sdkp->unmap_alignment * 614 logical_block_size; 615 q->limits.discard_granularity = 616 max(sdkp->physical_block_size, 617 sdkp->unmap_granularity * logical_block_size); 618 619 sdkp->provisioning_mode = mode; 620 621 switch (mode) { 622 623 case SD_LBP_DISABLE: 624 q->limits.max_discard_sectors = 0; 625 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); 626 return; 627 628 case SD_LBP_UNMAP: 629 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 630 (u32)SD_MAX_WS16_BLOCKS); 631 break; 632 633 case SD_LBP_WS16: 634 max_blocks = min_not_zero(sdkp->max_ws_blocks, 635 (u32)SD_MAX_WS16_BLOCKS); 636 break; 637 638 case SD_LBP_WS10: 639 max_blocks = min_not_zero(sdkp->max_ws_blocks, 640 (u32)SD_MAX_WS10_BLOCKS); 641 break; 642 643 case SD_LBP_ZERO: 644 max_blocks = min_not_zero(sdkp->max_ws_blocks, 645 (u32)SD_MAX_WS10_BLOCKS); 646 q->limits.discard_zeroes_data = 1; 647 break; 648 } 649 650 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9); 651 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); 652 } 653 654 /** 655 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device 656 * @sdp: scsi device to operate one 657 * @rq: Request to prepare 658 * 659 * Will issue either UNMAP or WRITE SAME(16) depending on preference 660 * indicated by target device. 661 **/ 662 static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq) 663 { 664 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 665 sector_t sector = blk_rq_pos(rq); 666 unsigned int nr_sectors = blk_rq_sectors(rq); 667 unsigned int nr_bytes = blk_rq_bytes(rq); 668 unsigned int len; 669 int ret; 670 char *buf; 671 struct page *page; 672 673 sector >>= ilog2(sdp->sector_size) - 9; 674 nr_sectors >>= ilog2(sdp->sector_size) - 9; 675 rq->timeout = SD_TIMEOUT; 676 677 memset(rq->cmd, 0, rq->cmd_len); 678 679 page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 680 if (!page) 681 return BLKPREP_DEFER; 682 683 switch (sdkp->provisioning_mode) { 684 case SD_LBP_UNMAP: 685 buf = page_address(page); 686 687 rq->cmd_len = 10; 688 rq->cmd[0] = UNMAP; 689 rq->cmd[8] = 24; 690 691 put_unaligned_be16(6 + 16, &buf[0]); 692 put_unaligned_be16(16, &buf[2]); 693 put_unaligned_be64(sector, &buf[8]); 694 put_unaligned_be32(nr_sectors, &buf[16]); 695 696 len = 24; 697 break; 698 699 case SD_LBP_WS16: 700 rq->cmd_len = 16; 701 rq->cmd[0] = WRITE_SAME_16; 702 rq->cmd[1] = 0x8; /* UNMAP */ 703 put_unaligned_be64(sector, &rq->cmd[2]); 704 put_unaligned_be32(nr_sectors, &rq->cmd[10]); 705 706 len = sdkp->device->sector_size; 707 break; 708 709 case SD_LBP_WS10: 710 case SD_LBP_ZERO: 711 rq->cmd_len = 10; 712 rq->cmd[0] = WRITE_SAME; 713 if (sdkp->provisioning_mode == SD_LBP_WS10) 714 rq->cmd[1] = 0x8; /* UNMAP */ 715 put_unaligned_be32(sector, &rq->cmd[2]); 716 put_unaligned_be16(nr_sectors, &rq->cmd[7]); 717 718 len = sdkp->device->sector_size; 719 break; 720 721 default: 722 ret = BLKPREP_KILL; 723 goto out; 724 } 725 726 blk_add_request_payload(rq, page, len); 727 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 728 rq->buffer = page_address(page); 729 rq->__data_len = nr_bytes; 730 731 out: 732 if (ret != BLKPREP_OK) { 733 __free_page(page); 734 rq->buffer = NULL; 735 } 736 return ret; 737 } 738 739 static void sd_config_write_same(struct scsi_disk *sdkp) 740 { 741 struct request_queue *q = sdkp->disk->queue; 742 unsigned int logical_block_size = sdkp->device->sector_size; 743 unsigned int blocks = 0; 744 745 if (sdkp->device->no_write_same) { 746 sdkp->max_ws_blocks = 0; 747 goto out; 748 } 749 750 /* Some devices can not handle block counts above 0xffff despite 751 * supporting WRITE SAME(16). Consequently we default to 64k 752 * blocks per I/O unless the device explicitly advertises a 753 * bigger limit. 754 */ 755 if (sdkp->max_ws_blocks == 0) 756 sdkp->max_ws_blocks = SD_MAX_WS10_BLOCKS; 757 758 if (sdkp->ws16 || sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS) 759 blocks = min_not_zero(sdkp->max_ws_blocks, 760 (u32)SD_MAX_WS16_BLOCKS); 761 else 762 blocks = min_not_zero(sdkp->max_ws_blocks, 763 (u32)SD_MAX_WS10_BLOCKS); 764 765 out: 766 blk_queue_max_write_same_sectors(q, blocks * (logical_block_size >> 9)); 767 } 768 769 /** 770 * sd_setup_write_same_cmnd - write the same data to multiple blocks 771 * @sdp: scsi device to operate one 772 * @rq: Request to prepare 773 * 774 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on 775 * preference indicated by target device. 776 **/ 777 static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq) 778 { 779 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 780 struct bio *bio = rq->bio; 781 sector_t sector = blk_rq_pos(rq); 782 unsigned int nr_sectors = blk_rq_sectors(rq); 783 unsigned int nr_bytes = blk_rq_bytes(rq); 784 int ret; 785 786 if (sdkp->device->no_write_same) 787 return BLKPREP_KILL; 788 789 BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size); 790 791 sector >>= ilog2(sdp->sector_size) - 9; 792 nr_sectors >>= ilog2(sdp->sector_size) - 9; 793 794 rq->__data_len = sdp->sector_size; 795 rq->timeout = SD_WRITE_SAME_TIMEOUT; 796 memset(rq->cmd, 0, rq->cmd_len); 797 798 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) { 799 rq->cmd_len = 16; 800 rq->cmd[0] = WRITE_SAME_16; 801 put_unaligned_be64(sector, &rq->cmd[2]); 802 put_unaligned_be32(nr_sectors, &rq->cmd[10]); 803 } else { 804 rq->cmd_len = 10; 805 rq->cmd[0] = WRITE_SAME; 806 put_unaligned_be32(sector, &rq->cmd[2]); 807 put_unaligned_be16(nr_sectors, &rq->cmd[7]); 808 } 809 810 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 811 rq->__data_len = nr_bytes; 812 813 return ret; 814 } 815 816 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq) 817 { 818 rq->timeout = SD_FLUSH_TIMEOUT; 819 rq->retries = SD_MAX_RETRIES; 820 rq->cmd[0] = SYNCHRONIZE_CACHE; 821 rq->cmd_len = 10; 822 823 return scsi_setup_blk_pc_cmnd(sdp, rq); 824 } 825 826 static void sd_unprep_fn(struct request_queue *q, struct request *rq) 827 { 828 if (rq->cmd_flags & REQ_DISCARD) { 829 free_page((unsigned long)rq->buffer); 830 rq->buffer = NULL; 831 } 832 } 833 834 /** 835 * sd_prep_fn - build a scsi (read or write) command from 836 * information in the request structure. 837 * @SCpnt: pointer to mid-level's per scsi command structure that 838 * contains request and into which the scsi command is written 839 * 840 * Returns 1 if successful and 0 if error (or cannot be done now). 841 **/ 842 static int sd_prep_fn(struct request_queue *q, struct request *rq) 843 { 844 struct scsi_cmnd *SCpnt; 845 struct scsi_device *sdp = q->queuedata; 846 struct gendisk *disk = rq->rq_disk; 847 struct scsi_disk *sdkp; 848 sector_t block = blk_rq_pos(rq); 849 sector_t threshold; 850 unsigned int this_count = blk_rq_sectors(rq); 851 int ret, host_dif; 852 unsigned char protect; 853 854 /* 855 * Discard request come in as REQ_TYPE_FS but we turn them into 856 * block PC requests to make life easier. 857 */ 858 if (rq->cmd_flags & REQ_DISCARD) { 859 ret = sd_setup_discard_cmnd(sdp, rq); 860 goto out; 861 } else if (rq->cmd_flags & REQ_WRITE_SAME) { 862 ret = sd_setup_write_same_cmnd(sdp, rq); 863 goto out; 864 } else if (rq->cmd_flags & REQ_FLUSH) { 865 ret = scsi_setup_flush_cmnd(sdp, rq); 866 goto out; 867 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 868 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 869 goto out; 870 } else if (rq->cmd_type != REQ_TYPE_FS) { 871 ret = BLKPREP_KILL; 872 goto out; 873 } 874 ret = scsi_setup_fs_cmnd(sdp, rq); 875 if (ret != BLKPREP_OK) 876 goto out; 877 SCpnt = rq->special; 878 sdkp = scsi_disk(disk); 879 880 /* from here on until we're complete, any goto out 881 * is used for a killable error condition */ 882 ret = BLKPREP_KILL; 883 884 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 885 "sd_prep_fn: block=%llu, " 886 "count=%d\n", 887 (unsigned long long)block, 888 this_count)); 889 890 if (!sdp || !scsi_device_online(sdp) || 891 block + blk_rq_sectors(rq) > get_capacity(disk)) { 892 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 893 "Finishing %u sectors\n", 894 blk_rq_sectors(rq))); 895 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 896 "Retry with 0x%p\n", SCpnt)); 897 goto out; 898 } 899 900 if (sdp->changed) { 901 /* 902 * quietly refuse to do anything to a changed disc until 903 * the changed bit has been reset 904 */ 905 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */ 906 goto out; 907 } 908 909 /* 910 * Some SD card readers can't handle multi-sector accesses which touch 911 * the last one or two hardware sectors. Split accesses as needed. 912 */ 913 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 914 (sdp->sector_size / 512); 915 916 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 917 if (block < threshold) { 918 /* Access up to the threshold but not beyond */ 919 this_count = threshold - block; 920 } else { 921 /* Access only a single hardware sector */ 922 this_count = sdp->sector_size / 512; 923 } 924 } 925 926 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 927 (unsigned long long)block)); 928 929 /* 930 * If we have a 1K hardware sectorsize, prevent access to single 931 * 512 byte sectors. In theory we could handle this - in fact 932 * the scsi cdrom driver must be able to handle this because 933 * we typically use 1K blocksizes, and cdroms typically have 934 * 2K hardware sectorsizes. Of course, things are simpler 935 * with the cdrom, since it is read-only. For performance 936 * reasons, the filesystems should be able to handle this 937 * and not force the scsi disk driver to use bounce buffers 938 * for this. 939 */ 940 if (sdp->sector_size == 1024) { 941 if ((block & 1) || (blk_rq_sectors(rq) & 1)) { 942 scmd_printk(KERN_ERR, SCpnt, 943 "Bad block number requested\n"); 944 goto out; 945 } else { 946 block = block >> 1; 947 this_count = this_count >> 1; 948 } 949 } 950 if (sdp->sector_size == 2048) { 951 if ((block & 3) || (blk_rq_sectors(rq) & 3)) { 952 scmd_printk(KERN_ERR, SCpnt, 953 "Bad block number requested\n"); 954 goto out; 955 } else { 956 block = block >> 2; 957 this_count = this_count >> 2; 958 } 959 } 960 if (sdp->sector_size == 4096) { 961 if ((block & 7) || (blk_rq_sectors(rq) & 7)) { 962 scmd_printk(KERN_ERR, SCpnt, 963 "Bad block number requested\n"); 964 goto out; 965 } else { 966 block = block >> 3; 967 this_count = this_count >> 3; 968 } 969 } 970 if (rq_data_dir(rq) == WRITE) { 971 if (!sdp->writeable) { 972 goto out; 973 } 974 SCpnt->cmnd[0] = WRITE_6; 975 SCpnt->sc_data_direction = DMA_TO_DEVICE; 976 977 if (blk_integrity_rq(rq)) 978 sd_dif_prepare(rq, block, sdp->sector_size); 979 980 } else if (rq_data_dir(rq) == READ) { 981 SCpnt->cmnd[0] = READ_6; 982 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 983 } else { 984 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); 985 goto out; 986 } 987 988 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 989 "%s %d/%u 512 byte blocks.\n", 990 (rq_data_dir(rq) == WRITE) ? 991 "writing" : "reading", this_count, 992 blk_rq_sectors(rq))); 993 994 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ 995 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 996 if (host_dif) 997 protect = 1 << 5; 998 else 999 protect = 0; 1000 1001 if (host_dif == SD_DIF_TYPE2_PROTECTION) { 1002 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); 1003 1004 if (unlikely(SCpnt->cmnd == NULL)) { 1005 ret = BLKPREP_DEFER; 1006 goto out; 1007 } 1008 1009 SCpnt->cmd_len = SD_EXT_CDB_SIZE; 1010 memset(SCpnt->cmnd, 0, SCpnt->cmd_len); 1011 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; 1012 SCpnt->cmnd[7] = 0x18; 1013 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; 1014 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1015 1016 /* LBA */ 1017 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 1018 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 1019 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 1020 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 1021 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; 1022 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; 1023 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; 1024 SCpnt->cmnd[19] = (unsigned char) block & 0xff; 1025 1026 /* Expected Indirect LBA */ 1027 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; 1028 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; 1029 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; 1030 SCpnt->cmnd[23] = (unsigned char) block & 0xff; 1031 1032 /* Transfer length */ 1033 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; 1034 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; 1035 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; 1036 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; 1037 } else if (sdp->use_16_for_rw) { 1038 SCpnt->cmnd[0] += READ_16 - READ_6; 1039 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1040 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 1041 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 1042 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 1043 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 1044 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 1045 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 1046 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 1047 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 1048 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 1049 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 1050 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 1051 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 1052 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 1053 } else if ((this_count > 0xff) || (block > 0x1fffff) || 1054 scsi_device_protection(SCpnt->device) || 1055 SCpnt->device->use_10_for_rw) { 1056 if (this_count > 0xffff) 1057 this_count = 0xffff; 1058 1059 SCpnt->cmnd[0] += READ_10 - READ_6; 1060 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1061 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 1062 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 1063 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 1064 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 1065 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 1066 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 1067 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 1068 } else { 1069 if (unlikely(rq->cmd_flags & REQ_FUA)) { 1070 /* 1071 * This happens only if this drive failed 1072 * 10byte rw command with ILLEGAL_REQUEST 1073 * during operation and thus turned off 1074 * use_10_for_rw. 1075 */ 1076 scmd_printk(KERN_ERR, SCpnt, 1077 "FUA write on READ/WRITE(6) drive\n"); 1078 goto out; 1079 } 1080 1081 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 1082 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 1083 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 1084 SCpnt->cmnd[4] = (unsigned char) this_count; 1085 SCpnt->cmnd[5] = 0; 1086 } 1087 SCpnt->sdb.length = this_count * sdp->sector_size; 1088 1089 /* If DIF or DIX is enabled, tell HBA how to handle request */ 1090 if (host_dif || scsi_prot_sg_count(SCpnt)) 1091 sd_prot_op(SCpnt, host_dif); 1092 1093 /* 1094 * We shouldn't disconnect in the middle of a sector, so with a dumb 1095 * host adapter, it's safe to assume that we can at least transfer 1096 * this many bytes between each connect / disconnect. 1097 */ 1098 SCpnt->transfersize = sdp->sector_size; 1099 SCpnt->underflow = this_count << 9; 1100 SCpnt->allowed = SD_MAX_RETRIES; 1101 1102 /* 1103 * This indicates that the command is ready from our end to be 1104 * queued. 1105 */ 1106 ret = BLKPREP_OK; 1107 out: 1108 return scsi_prep_return(q, rq, ret); 1109 } 1110 1111 /** 1112 * sd_open - open a scsi disk device 1113 * @inode: only i_rdev member may be used 1114 * @filp: only f_mode and f_flags may be used 1115 * 1116 * Returns 0 if successful. Returns a negated errno value in case 1117 * of error. 1118 * 1119 * Note: This can be called from a user context (e.g. fsck(1) ) 1120 * or from within the kernel (e.g. as a result of a mount(1) ). 1121 * In the latter case @inode and @filp carry an abridged amount 1122 * of information as noted above. 1123 * 1124 * Locking: called with bdev->bd_mutex held. 1125 **/ 1126 static int sd_open(struct block_device *bdev, fmode_t mode) 1127 { 1128 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 1129 struct scsi_device *sdev; 1130 int retval; 1131 1132 if (!sdkp) 1133 return -ENXIO; 1134 1135 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 1136 1137 sdev = sdkp->device; 1138 1139 /* 1140 * If the device is in error recovery, wait until it is done. 1141 * If the device is offline, then disallow any access to it. 1142 */ 1143 retval = -ENXIO; 1144 if (!scsi_block_when_processing_errors(sdev)) 1145 goto error_out; 1146 1147 if (sdev->removable || sdkp->write_prot) 1148 check_disk_change(bdev); 1149 1150 /* 1151 * If the drive is empty, just let the open fail. 1152 */ 1153 retval = -ENOMEDIUM; 1154 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 1155 goto error_out; 1156 1157 /* 1158 * If the device has the write protect tab set, have the open fail 1159 * if the user expects to be able to write to the thing. 1160 */ 1161 retval = -EROFS; 1162 if (sdkp->write_prot && (mode & FMODE_WRITE)) 1163 goto error_out; 1164 1165 /* 1166 * It is possible that the disk changing stuff resulted in 1167 * the device being taken offline. If this is the case, 1168 * report this to the user, and don't pretend that the 1169 * open actually succeeded. 1170 */ 1171 retval = -ENXIO; 1172 if (!scsi_device_online(sdev)) 1173 goto error_out; 1174 1175 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { 1176 if (scsi_block_when_processing_errors(sdev)) 1177 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 1178 } 1179 1180 return 0; 1181 1182 error_out: 1183 scsi_disk_put(sdkp); 1184 return retval; 1185 } 1186 1187 /** 1188 * sd_release - invoked when the (last) close(2) is called on this 1189 * scsi disk. 1190 * @inode: only i_rdev member may be used 1191 * @filp: only f_mode and f_flags may be used 1192 * 1193 * Returns 0. 1194 * 1195 * Note: may block (uninterruptible) if error recovery is underway 1196 * on this disk. 1197 * 1198 * Locking: called with bdev->bd_mutex held. 1199 **/ 1200 static void sd_release(struct gendisk *disk, fmode_t mode) 1201 { 1202 struct scsi_disk *sdkp = scsi_disk(disk); 1203 struct scsi_device *sdev = sdkp->device; 1204 1205 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 1206 1207 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) { 1208 if (scsi_block_when_processing_errors(sdev)) 1209 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 1210 } 1211 1212 /* 1213 * XXX and what if there are packets in flight and this close() 1214 * XXX is followed by a "rmmod sd_mod"? 1215 */ 1216 1217 scsi_disk_put(sdkp); 1218 } 1219 1220 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 1221 { 1222 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 1223 struct scsi_device *sdp = sdkp->device; 1224 struct Scsi_Host *host = sdp->host; 1225 int diskinfo[4]; 1226 1227 /* default to most commonly used values */ 1228 diskinfo[0] = 0x40; /* 1 << 6 */ 1229 diskinfo[1] = 0x20; /* 1 << 5 */ 1230 diskinfo[2] = sdkp->capacity >> 11; 1231 1232 /* override with calculated, extended default, or driver values */ 1233 if (host->hostt->bios_param) 1234 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 1235 else 1236 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 1237 1238 geo->heads = diskinfo[0]; 1239 geo->sectors = diskinfo[1]; 1240 geo->cylinders = diskinfo[2]; 1241 return 0; 1242 } 1243 1244 /** 1245 * sd_ioctl - process an ioctl 1246 * @inode: only i_rdev/i_bdev members may be used 1247 * @filp: only f_mode and f_flags may be used 1248 * @cmd: ioctl command number 1249 * @arg: this is third argument given to ioctl(2) system call. 1250 * Often contains a pointer. 1251 * 1252 * Returns 0 if successful (some ioctls return positive numbers on 1253 * success as well). Returns a negated errno value in case of error. 1254 * 1255 * Note: most ioctls are forward onto the block subsystem or further 1256 * down in the scsi subsystem. 1257 **/ 1258 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 1259 unsigned int cmd, unsigned long arg) 1260 { 1261 struct gendisk *disk = bdev->bd_disk; 1262 struct scsi_disk *sdkp = scsi_disk(disk); 1263 struct scsi_device *sdp = sdkp->device; 1264 void __user *p = (void __user *)arg; 1265 int error; 1266 1267 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, " 1268 "cmd=0x%x\n", disk->disk_name, cmd)); 1269 1270 error = scsi_verify_blk_ioctl(bdev, cmd); 1271 if (error < 0) 1272 return error; 1273 1274 /* 1275 * If we are in the middle of error recovery, don't let anyone 1276 * else try and use this device. Also, if error recovery fails, it 1277 * may try and take the device offline, in which case all further 1278 * access to the device is prohibited. 1279 */ 1280 error = scsi_nonblockable_ioctl(sdp, cmd, p, 1281 (mode & FMODE_NDELAY) != 0); 1282 if (!scsi_block_when_processing_errors(sdp) || !error) 1283 goto out; 1284 1285 /* 1286 * Send SCSI addressing ioctls directly to mid level, send other 1287 * ioctls to block level and then onto mid level if they can't be 1288 * resolved. 1289 */ 1290 switch (cmd) { 1291 case SCSI_IOCTL_GET_IDLUN: 1292 case SCSI_IOCTL_GET_BUS_NUMBER: 1293 error = scsi_ioctl(sdp, cmd, p); 1294 break; 1295 default: 1296 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p); 1297 if (error != -ENOTTY) 1298 break; 1299 error = scsi_ioctl(sdp, cmd, p); 1300 break; 1301 } 1302 out: 1303 return error; 1304 } 1305 1306 static void set_media_not_present(struct scsi_disk *sdkp) 1307 { 1308 if (sdkp->media_present) 1309 sdkp->device->changed = 1; 1310 1311 if (sdkp->device->removable) { 1312 sdkp->media_present = 0; 1313 sdkp->capacity = 0; 1314 } 1315 } 1316 1317 static int media_not_present(struct scsi_disk *sdkp, 1318 struct scsi_sense_hdr *sshdr) 1319 { 1320 if (!scsi_sense_valid(sshdr)) 1321 return 0; 1322 1323 /* not invoked for commands that could return deferred errors */ 1324 switch (sshdr->sense_key) { 1325 case UNIT_ATTENTION: 1326 case NOT_READY: 1327 /* medium not present */ 1328 if (sshdr->asc == 0x3A) { 1329 set_media_not_present(sdkp); 1330 return 1; 1331 } 1332 } 1333 return 0; 1334 } 1335 1336 /** 1337 * sd_check_events - check media events 1338 * @disk: kernel device descriptor 1339 * @clearing: disk events currently being cleared 1340 * 1341 * Returns mask of DISK_EVENT_*. 1342 * 1343 * Note: this function is invoked from the block subsystem. 1344 **/ 1345 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) 1346 { 1347 struct scsi_disk *sdkp = scsi_disk(disk); 1348 struct scsi_device *sdp = sdkp->device; 1349 struct scsi_sense_hdr *sshdr = NULL; 1350 int retval; 1351 1352 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n")); 1353 1354 /* 1355 * If the device is offline, don't send any commands - just pretend as 1356 * if the command failed. If the device ever comes back online, we 1357 * can deal with it then. It is only because of unrecoverable errors 1358 * that we would ever take a device offline in the first place. 1359 */ 1360 if (!scsi_device_online(sdp)) { 1361 set_media_not_present(sdkp); 1362 goto out; 1363 } 1364 1365 /* 1366 * Using TEST_UNIT_READY enables differentiation between drive with 1367 * no cartridge loaded - NOT READY, drive with changed cartridge - 1368 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 1369 * 1370 * Drives that auto spin down. eg iomega jaz 1G, will be started 1371 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 1372 * sd_revalidate() is called. 1373 */ 1374 retval = -ENODEV; 1375 1376 if (scsi_block_when_processing_errors(sdp)) { 1377 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 1378 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 1379 sshdr); 1380 } 1381 1382 /* failed to execute TUR, assume media not present */ 1383 if (host_byte(retval)) { 1384 set_media_not_present(sdkp); 1385 goto out; 1386 } 1387 1388 if (media_not_present(sdkp, sshdr)) 1389 goto out; 1390 1391 /* 1392 * For removable scsi disk we have to recognise the presence 1393 * of a disk in the drive. 1394 */ 1395 if (!sdkp->media_present) 1396 sdp->changed = 1; 1397 sdkp->media_present = 1; 1398 out: 1399 /* 1400 * sdp->changed is set under the following conditions: 1401 * 1402 * Medium present state has changed in either direction. 1403 * Device has indicated UNIT_ATTENTION. 1404 */ 1405 kfree(sshdr); 1406 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0; 1407 sdp->changed = 0; 1408 return retval; 1409 } 1410 1411 static int sd_sync_cache(struct scsi_disk *sdkp) 1412 { 1413 int retries, res; 1414 struct scsi_device *sdp = sdkp->device; 1415 struct scsi_sense_hdr sshdr; 1416 1417 if (!scsi_device_online(sdp)) 1418 return -ENODEV; 1419 1420 1421 for (retries = 3; retries > 0; --retries) { 1422 unsigned char cmd[10] = { 0 }; 1423 1424 cmd[0] = SYNCHRONIZE_CACHE; 1425 /* 1426 * Leave the rest of the command zero to indicate 1427 * flush everything. 1428 */ 1429 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, 1430 &sshdr, SD_FLUSH_TIMEOUT, 1431 SD_MAX_RETRIES, NULL, REQ_PM); 1432 if (res == 0) 1433 break; 1434 } 1435 1436 if (res) { 1437 sd_print_result(sdkp, res); 1438 if (driver_byte(res) & DRIVER_SENSE) 1439 sd_print_sense_hdr(sdkp, &sshdr); 1440 } 1441 1442 if (res) 1443 return -EIO; 1444 return 0; 1445 } 1446 1447 static void sd_rescan(struct device *dev) 1448 { 1449 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1450 1451 if (sdkp) { 1452 revalidate_disk(sdkp->disk); 1453 scsi_disk_put(sdkp); 1454 } 1455 } 1456 1457 1458 #ifdef CONFIG_COMPAT 1459 /* 1460 * This gets directly called from VFS. When the ioctl 1461 * is not recognized we go back to the other translation paths. 1462 */ 1463 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1464 unsigned int cmd, unsigned long arg) 1465 { 1466 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1467 int ret; 1468 1469 ret = scsi_verify_blk_ioctl(bdev, cmd); 1470 if (ret < 0) 1471 return ret; 1472 1473 /* 1474 * If we are in the middle of error recovery, don't let anyone 1475 * else try and use this device. Also, if error recovery fails, it 1476 * may try and take the device offline, in which case all further 1477 * access to the device is prohibited. 1478 */ 1479 if (!scsi_block_when_processing_errors(sdev)) 1480 return -ENODEV; 1481 1482 if (sdev->host->hostt->compat_ioctl) { 1483 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1484 1485 return ret; 1486 } 1487 1488 /* 1489 * Let the static ioctl translation table take care of it. 1490 */ 1491 return -ENOIOCTLCMD; 1492 } 1493 #endif 1494 1495 static const struct block_device_operations sd_fops = { 1496 .owner = THIS_MODULE, 1497 .open = sd_open, 1498 .release = sd_release, 1499 .ioctl = sd_ioctl, 1500 .getgeo = sd_getgeo, 1501 #ifdef CONFIG_COMPAT 1502 .compat_ioctl = sd_compat_ioctl, 1503 #endif 1504 .check_events = sd_check_events, 1505 .revalidate_disk = sd_revalidate_disk, 1506 .unlock_native_capacity = sd_unlock_native_capacity, 1507 }; 1508 1509 /** 1510 * sd_eh_action - error handling callback 1511 * @scmd: sd-issued command that has failed 1512 * @eh_cmnd: The command that was sent during error handling 1513 * @eh_cmnd_len: Length of eh_cmnd in bytes 1514 * @eh_disp: The recovery disposition suggested by the midlayer 1515 * 1516 * This function is called by the SCSI midlayer upon completion of 1517 * an error handling command (TEST UNIT READY, START STOP UNIT, 1518 * etc.) The command sent to the device by the error handler is 1519 * stored in eh_cmnd. The result of sending the eh command is 1520 * passed in eh_disp. 1521 **/ 1522 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd, 1523 int eh_cmnd_len, int eh_disp) 1524 { 1525 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); 1526 1527 if (!scsi_device_online(scmd->device) || 1528 !scsi_medium_access_command(scmd)) 1529 return eh_disp; 1530 1531 /* 1532 * The device has timed out executing a medium access command. 1533 * However, the TEST UNIT READY command sent during error 1534 * handling completed successfully. Either the device is in the 1535 * process of recovering or has it suffered an internal failure 1536 * that prevents access to the storage medium. 1537 */ 1538 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS && 1539 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY) 1540 sdkp->medium_access_timed_out++; 1541 1542 /* 1543 * If the device keeps failing read/write commands but TEST UNIT 1544 * READY always completes successfully we assume that medium 1545 * access is no longer possible and take the device offline. 1546 */ 1547 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) { 1548 scmd_printk(KERN_ERR, scmd, 1549 "Medium access timeout failure. Offlining disk!\n"); 1550 scsi_device_set_state(scmd->device, SDEV_OFFLINE); 1551 1552 return FAILED; 1553 } 1554 1555 return eh_disp; 1556 } 1557 1558 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1559 { 1560 u64 start_lba = blk_rq_pos(scmd->request); 1561 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); 1562 u64 bad_lba; 1563 int info_valid; 1564 /* 1565 * resid is optional but mostly filled in. When it's unused, 1566 * its value is zero, so we assume the whole buffer transferred 1567 */ 1568 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); 1569 unsigned int good_bytes; 1570 1571 if (scmd->request->cmd_type != REQ_TYPE_FS) 1572 return 0; 1573 1574 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 1575 SCSI_SENSE_BUFFERSIZE, 1576 &bad_lba); 1577 if (!info_valid) 1578 return 0; 1579 1580 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 1581 return 0; 1582 1583 if (scmd->device->sector_size < 512) { 1584 /* only legitimate sector_size here is 256 */ 1585 start_lba <<= 1; 1586 end_lba <<= 1; 1587 } else { 1588 /* be careful ... don't want any overflows */ 1589 u64 factor = scmd->device->sector_size / 512; 1590 do_div(start_lba, factor); 1591 do_div(end_lba, factor); 1592 } 1593 1594 /* The bad lba was reported incorrectly, we have no idea where 1595 * the error is. 1596 */ 1597 if (bad_lba < start_lba || bad_lba >= end_lba) 1598 return 0; 1599 1600 /* This computation should always be done in terms of 1601 * the resolution of the device's medium. 1602 */ 1603 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size; 1604 return min(good_bytes, transferred); 1605 } 1606 1607 /** 1608 * sd_done - bottom half handler: called when the lower level 1609 * driver has completed (successfully or otherwise) a scsi command. 1610 * @SCpnt: mid-level's per command structure. 1611 * 1612 * Note: potentially run from within an ISR. Must not block. 1613 **/ 1614 static int sd_done(struct scsi_cmnd *SCpnt) 1615 { 1616 int result = SCpnt->result; 1617 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1618 struct scsi_sense_hdr sshdr; 1619 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1620 struct request *req = SCpnt->request; 1621 int sense_valid = 0; 1622 int sense_deferred = 0; 1623 unsigned char op = SCpnt->cmnd[0]; 1624 unsigned char unmap = SCpnt->cmnd[1] & 8; 1625 1626 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) { 1627 if (!result) { 1628 good_bytes = blk_rq_bytes(req); 1629 scsi_set_resid(SCpnt, 0); 1630 } else { 1631 good_bytes = 0; 1632 scsi_set_resid(SCpnt, blk_rq_bytes(req)); 1633 } 1634 } 1635 1636 if (result) { 1637 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1638 if (sense_valid) 1639 sense_deferred = scsi_sense_is_deferred(&sshdr); 1640 } 1641 #ifdef CONFIG_SCSI_LOGGING 1642 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 1643 if (sense_valid) { 1644 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1645 "sd_done: sb[respc,sk,asc," 1646 "ascq]=%x,%x,%x,%x\n", 1647 sshdr.response_code, 1648 sshdr.sense_key, sshdr.asc, 1649 sshdr.ascq)); 1650 } 1651 #endif 1652 if (driver_byte(result) != DRIVER_SENSE && 1653 (!sense_valid || sense_deferred)) 1654 goto out; 1655 1656 sdkp->medium_access_timed_out = 0; 1657 1658 switch (sshdr.sense_key) { 1659 case HARDWARE_ERROR: 1660 case MEDIUM_ERROR: 1661 good_bytes = sd_completed_bytes(SCpnt); 1662 break; 1663 case RECOVERED_ERROR: 1664 good_bytes = scsi_bufflen(SCpnt); 1665 break; 1666 case NO_SENSE: 1667 /* This indicates a false check condition, so ignore it. An 1668 * unknown amount of data was transferred so treat it as an 1669 * error. 1670 */ 1671 scsi_print_sense("sd", SCpnt); 1672 SCpnt->result = 0; 1673 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1674 break; 1675 case ABORTED_COMMAND: 1676 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */ 1677 good_bytes = sd_completed_bytes(SCpnt); 1678 break; 1679 case ILLEGAL_REQUEST: 1680 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */ 1681 good_bytes = sd_completed_bytes(SCpnt); 1682 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */ 1683 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) { 1684 switch (op) { 1685 case UNMAP: 1686 sd_config_discard(sdkp, SD_LBP_DISABLE); 1687 break; 1688 case WRITE_SAME_16: 1689 case WRITE_SAME: 1690 if (unmap) 1691 sd_config_discard(sdkp, SD_LBP_DISABLE); 1692 else { 1693 sdkp->device->no_write_same = 1; 1694 sd_config_write_same(sdkp); 1695 1696 good_bytes = 0; 1697 req->__data_len = blk_rq_bytes(req); 1698 req->cmd_flags |= REQ_QUIET; 1699 } 1700 } 1701 } 1702 break; 1703 default: 1704 break; 1705 } 1706 out: 1707 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1708 sd_dif_complete(SCpnt, good_bytes); 1709 1710 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type) 1711 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) { 1712 1713 /* We have to print a failed command here as the 1714 * extended CDB gets freed before scsi_io_completion() 1715 * is called. 1716 */ 1717 if (result) 1718 scsi_print_command(SCpnt); 1719 1720 mempool_free(SCpnt->cmnd, sd_cdb_pool); 1721 SCpnt->cmnd = NULL; 1722 SCpnt->cmd_len = 0; 1723 } 1724 1725 return good_bytes; 1726 } 1727 1728 /* 1729 * spinup disk - called only in sd_revalidate_disk() 1730 */ 1731 static void 1732 sd_spinup_disk(struct scsi_disk *sdkp) 1733 { 1734 unsigned char cmd[10]; 1735 unsigned long spintime_expire = 0; 1736 int retries, spintime; 1737 unsigned int the_result; 1738 struct scsi_sense_hdr sshdr; 1739 int sense_valid = 0; 1740 1741 spintime = 0; 1742 1743 /* Spin up drives, as required. Only do this at boot time */ 1744 /* Spinup needs to be done for module loads too. */ 1745 do { 1746 retries = 0; 1747 1748 do { 1749 cmd[0] = TEST_UNIT_READY; 1750 memset((void *) &cmd[1], 0, 9); 1751 1752 the_result = scsi_execute_req(sdkp->device, cmd, 1753 DMA_NONE, NULL, 0, 1754 &sshdr, SD_TIMEOUT, 1755 SD_MAX_RETRIES, NULL); 1756 1757 /* 1758 * If the drive has indicated to us that it 1759 * doesn't have any media in it, don't bother 1760 * with any more polling. 1761 */ 1762 if (media_not_present(sdkp, &sshdr)) 1763 return; 1764 1765 if (the_result) 1766 sense_valid = scsi_sense_valid(&sshdr); 1767 retries++; 1768 } while (retries < 3 && 1769 (!scsi_status_is_good(the_result) || 1770 ((driver_byte(the_result) & DRIVER_SENSE) && 1771 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1772 1773 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1774 /* no sense, TUR either succeeded or failed 1775 * with a status error */ 1776 if(!spintime && !scsi_status_is_good(the_result)) { 1777 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1778 sd_print_result(sdkp, the_result); 1779 } 1780 break; 1781 } 1782 1783 /* 1784 * The device does not want the automatic start to be issued. 1785 */ 1786 if (sdkp->device->no_start_on_add) 1787 break; 1788 1789 if (sense_valid && sshdr.sense_key == NOT_READY) { 1790 if (sshdr.asc == 4 && sshdr.ascq == 3) 1791 break; /* manual intervention required */ 1792 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 1793 break; /* standby */ 1794 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 1795 break; /* unavailable */ 1796 /* 1797 * Issue command to spin up drive when not ready 1798 */ 1799 if (!spintime) { 1800 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1801 cmd[0] = START_STOP; 1802 cmd[1] = 1; /* Return immediately */ 1803 memset((void *) &cmd[2], 0, 8); 1804 cmd[4] = 1; /* Start spin cycle */ 1805 if (sdkp->device->start_stop_pwr_cond) 1806 cmd[4] |= 1 << 4; 1807 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1808 NULL, 0, &sshdr, 1809 SD_TIMEOUT, SD_MAX_RETRIES, 1810 NULL); 1811 spintime_expire = jiffies + 100 * HZ; 1812 spintime = 1; 1813 } 1814 /* Wait 1 second for next try */ 1815 msleep(1000); 1816 printk("."); 1817 1818 /* 1819 * Wait for USB flash devices with slow firmware. 1820 * Yes, this sense key/ASC combination shouldn't 1821 * occur here. It's characteristic of these devices. 1822 */ 1823 } else if (sense_valid && 1824 sshdr.sense_key == UNIT_ATTENTION && 1825 sshdr.asc == 0x28) { 1826 if (!spintime) { 1827 spintime_expire = jiffies + 5 * HZ; 1828 spintime = 1; 1829 } 1830 /* Wait 1 second for next try */ 1831 msleep(1000); 1832 } else { 1833 /* we don't understand the sense code, so it's 1834 * probably pointless to loop */ 1835 if(!spintime) { 1836 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1837 sd_print_sense_hdr(sdkp, &sshdr); 1838 } 1839 break; 1840 } 1841 1842 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1843 1844 if (spintime) { 1845 if (scsi_status_is_good(the_result)) 1846 printk("ready\n"); 1847 else 1848 printk("not responding...\n"); 1849 } 1850 } 1851 1852 1853 /* 1854 * Determine whether disk supports Data Integrity Field. 1855 */ 1856 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1857 { 1858 struct scsi_device *sdp = sdkp->device; 1859 u8 type; 1860 int ret = 0; 1861 1862 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1863 return ret; 1864 1865 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1866 1867 if (type > SD_DIF_TYPE3_PROTECTION) 1868 ret = -ENODEV; 1869 else if (scsi_host_dif_capable(sdp->host, type)) 1870 ret = 1; 1871 1872 if (sdkp->first_scan || type != sdkp->protection_type) 1873 switch (ret) { 1874 case -ENODEV: 1875 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \ 1876 " protection type %u. Disabling disk!\n", 1877 type); 1878 break; 1879 case 1: 1880 sd_printk(KERN_NOTICE, sdkp, 1881 "Enabling DIF Type %u protection\n", type); 1882 break; 1883 case 0: 1884 sd_printk(KERN_NOTICE, sdkp, 1885 "Disabling DIF Type %u protection\n", type); 1886 break; 1887 } 1888 1889 sdkp->protection_type = type; 1890 1891 return ret; 1892 } 1893 1894 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 1895 struct scsi_sense_hdr *sshdr, int sense_valid, 1896 int the_result) 1897 { 1898 sd_print_result(sdkp, the_result); 1899 if (driver_byte(the_result) & DRIVER_SENSE) 1900 sd_print_sense_hdr(sdkp, sshdr); 1901 else 1902 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1903 1904 /* 1905 * Set dirty bit for removable devices if not ready - 1906 * sometimes drives will not report this properly. 1907 */ 1908 if (sdp->removable && 1909 sense_valid && sshdr->sense_key == NOT_READY) 1910 set_media_not_present(sdkp); 1911 1912 /* 1913 * We used to set media_present to 0 here to indicate no media 1914 * in the drive, but some drives fail read capacity even with 1915 * media present, so we can't do that. 1916 */ 1917 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1918 } 1919 1920 #define RC16_LEN 32 1921 #if RC16_LEN > SD_BUF_SIZE 1922 #error RC16_LEN must not be more than SD_BUF_SIZE 1923 #endif 1924 1925 #define READ_CAPACITY_RETRIES_ON_RESET 10 1926 1927 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 1928 unsigned char *buffer) 1929 { 1930 unsigned char cmd[16]; 1931 struct scsi_sense_hdr sshdr; 1932 int sense_valid = 0; 1933 int the_result; 1934 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1935 unsigned int alignment; 1936 unsigned long long lba; 1937 unsigned sector_size; 1938 1939 if (sdp->no_read_capacity_16) 1940 return -EINVAL; 1941 1942 do { 1943 memset(cmd, 0, 16); 1944 cmd[0] = SERVICE_ACTION_IN; 1945 cmd[1] = SAI_READ_CAPACITY_16; 1946 cmd[13] = RC16_LEN; 1947 memset(buffer, 0, RC16_LEN); 1948 1949 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1950 buffer, RC16_LEN, &sshdr, 1951 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1952 1953 if (media_not_present(sdkp, &sshdr)) 1954 return -ENODEV; 1955 1956 if (the_result) { 1957 sense_valid = scsi_sense_valid(&sshdr); 1958 if (sense_valid && 1959 sshdr.sense_key == ILLEGAL_REQUEST && 1960 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 1961 sshdr.ascq == 0x00) 1962 /* Invalid Command Operation Code or 1963 * Invalid Field in CDB, just retry 1964 * silently with RC10 */ 1965 return -EINVAL; 1966 if (sense_valid && 1967 sshdr.sense_key == UNIT_ATTENTION && 1968 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1969 /* Device reset might occur several times, 1970 * give it one more chance */ 1971 if (--reset_retries > 0) 1972 continue; 1973 } 1974 retries--; 1975 1976 } while (the_result && retries); 1977 1978 if (the_result) { 1979 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1980 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1981 return -EINVAL; 1982 } 1983 1984 sector_size = get_unaligned_be32(&buffer[8]); 1985 lba = get_unaligned_be64(&buffer[0]); 1986 1987 if (sd_read_protection_type(sdkp, buffer) < 0) { 1988 sdkp->capacity = 0; 1989 return -ENODEV; 1990 } 1991 1992 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { 1993 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1994 "kernel compiled with support for large block " 1995 "devices.\n"); 1996 sdkp->capacity = 0; 1997 return -EOVERFLOW; 1998 } 1999 2000 /* Logical blocks per physical block exponent */ 2001 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; 2002 2003 /* Lowest aligned logical block */ 2004 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 2005 blk_queue_alignment_offset(sdp->request_queue, alignment); 2006 if (alignment && sdkp->first_scan) 2007 sd_printk(KERN_NOTICE, sdkp, 2008 "physical block alignment offset: %u\n", alignment); 2009 2010 if (buffer[14] & 0x80) { /* LBPME */ 2011 sdkp->lbpme = 1; 2012 2013 if (buffer[14] & 0x40) /* LBPRZ */ 2014 sdkp->lbprz = 1; 2015 2016 sd_config_discard(sdkp, SD_LBP_WS16); 2017 } 2018 2019 sdkp->capacity = lba + 1; 2020 return sector_size; 2021 } 2022 2023 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 2024 unsigned char *buffer) 2025 { 2026 unsigned char cmd[16]; 2027 struct scsi_sense_hdr sshdr; 2028 int sense_valid = 0; 2029 int the_result; 2030 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 2031 sector_t lba; 2032 unsigned sector_size; 2033 2034 do { 2035 cmd[0] = READ_CAPACITY; 2036 memset(&cmd[1], 0, 9); 2037 memset(buffer, 0, 8); 2038 2039 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 2040 buffer, 8, &sshdr, 2041 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2042 2043 if (media_not_present(sdkp, &sshdr)) 2044 return -ENODEV; 2045 2046 if (the_result) { 2047 sense_valid = scsi_sense_valid(&sshdr); 2048 if (sense_valid && 2049 sshdr.sense_key == UNIT_ATTENTION && 2050 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 2051 /* Device reset might occur several times, 2052 * give it one more chance */ 2053 if (--reset_retries > 0) 2054 continue; 2055 } 2056 retries--; 2057 2058 } while (the_result && retries); 2059 2060 if (the_result) { 2061 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 2062 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 2063 return -EINVAL; 2064 } 2065 2066 sector_size = get_unaligned_be32(&buffer[4]); 2067 lba = get_unaligned_be32(&buffer[0]); 2068 2069 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { 2070 /* Some buggy (usb cardreader) devices return an lba of 2071 0xffffffff when the want to report a size of 0 (with 2072 which they really mean no media is present) */ 2073 sdkp->capacity = 0; 2074 sdkp->physical_block_size = sector_size; 2075 return sector_size; 2076 } 2077 2078 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { 2079 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 2080 "kernel compiled with support for large block " 2081 "devices.\n"); 2082 sdkp->capacity = 0; 2083 return -EOVERFLOW; 2084 } 2085 2086 sdkp->capacity = lba + 1; 2087 sdkp->physical_block_size = sector_size; 2088 return sector_size; 2089 } 2090 2091 static int sd_try_rc16_first(struct scsi_device *sdp) 2092 { 2093 if (sdp->host->max_cmd_len < 16) 2094 return 0; 2095 if (sdp->try_rc_10_first) 2096 return 0; 2097 if (sdp->scsi_level > SCSI_SPC_2) 2098 return 1; 2099 if (scsi_device_protection(sdp)) 2100 return 1; 2101 return 0; 2102 } 2103 2104 /* 2105 * read disk capacity 2106 */ 2107 static void 2108 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 2109 { 2110 int sector_size; 2111 struct scsi_device *sdp = sdkp->device; 2112 sector_t old_capacity = sdkp->capacity; 2113 2114 if (sd_try_rc16_first(sdp)) { 2115 sector_size = read_capacity_16(sdkp, sdp, buffer); 2116 if (sector_size == -EOVERFLOW) 2117 goto got_data; 2118 if (sector_size == -ENODEV) 2119 return; 2120 if (sector_size < 0) 2121 sector_size = read_capacity_10(sdkp, sdp, buffer); 2122 if (sector_size < 0) 2123 return; 2124 } else { 2125 sector_size = read_capacity_10(sdkp, sdp, buffer); 2126 if (sector_size == -EOVERFLOW) 2127 goto got_data; 2128 if (sector_size < 0) 2129 return; 2130 if ((sizeof(sdkp->capacity) > 4) && 2131 (sdkp->capacity > 0xffffffffULL)) { 2132 int old_sector_size = sector_size; 2133 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 2134 "Trying to use READ CAPACITY(16).\n"); 2135 sector_size = read_capacity_16(sdkp, sdp, buffer); 2136 if (sector_size < 0) { 2137 sd_printk(KERN_NOTICE, sdkp, 2138 "Using 0xffffffff as device size\n"); 2139 sdkp->capacity = 1 + (sector_t) 0xffffffff; 2140 sector_size = old_sector_size; 2141 goto got_data; 2142 } 2143 } 2144 } 2145 2146 /* Some devices are known to return the total number of blocks, 2147 * not the highest block number. Some devices have versions 2148 * which do this and others which do not. Some devices we might 2149 * suspect of doing this but we don't know for certain. 2150 * 2151 * If we know the reported capacity is wrong, decrement it. If 2152 * we can only guess, then assume the number of blocks is even 2153 * (usually true but not always) and err on the side of lowering 2154 * the capacity. 2155 */ 2156 if (sdp->fix_capacity || 2157 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 2158 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 2159 "from its reported value: %llu\n", 2160 (unsigned long long) sdkp->capacity); 2161 --sdkp->capacity; 2162 } 2163 2164 got_data: 2165 if (sector_size == 0) { 2166 sector_size = 512; 2167 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 2168 "assuming 512.\n"); 2169 } 2170 2171 if (sector_size != 512 && 2172 sector_size != 1024 && 2173 sector_size != 2048 && 2174 sector_size != 4096 && 2175 sector_size != 256) { 2176 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 2177 sector_size); 2178 /* 2179 * The user might want to re-format the drive with 2180 * a supported sectorsize. Once this happens, it 2181 * would be relatively trivial to set the thing up. 2182 * For this reason, we leave the thing in the table. 2183 */ 2184 sdkp->capacity = 0; 2185 /* 2186 * set a bogus sector size so the normal read/write 2187 * logic in the block layer will eventually refuse any 2188 * request on this device without tripping over power 2189 * of two sector size assumptions 2190 */ 2191 sector_size = 512; 2192 } 2193 blk_queue_logical_block_size(sdp->request_queue, sector_size); 2194 2195 { 2196 char cap_str_2[10], cap_str_10[10]; 2197 u64 sz = (u64)sdkp->capacity << ilog2(sector_size); 2198 2199 string_get_size(sz, STRING_UNITS_2, cap_str_2, 2200 sizeof(cap_str_2)); 2201 string_get_size(sz, STRING_UNITS_10, cap_str_10, 2202 sizeof(cap_str_10)); 2203 2204 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 2205 sd_printk(KERN_NOTICE, sdkp, 2206 "%llu %d-byte logical blocks: (%s/%s)\n", 2207 (unsigned long long)sdkp->capacity, 2208 sector_size, cap_str_10, cap_str_2); 2209 2210 if (sdkp->physical_block_size != sector_size) 2211 sd_printk(KERN_NOTICE, sdkp, 2212 "%u-byte physical blocks\n", 2213 sdkp->physical_block_size); 2214 } 2215 } 2216 2217 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff); 2218 2219 /* Rescale capacity to 512-byte units */ 2220 if (sector_size == 4096) 2221 sdkp->capacity <<= 3; 2222 else if (sector_size == 2048) 2223 sdkp->capacity <<= 2; 2224 else if (sector_size == 1024) 2225 sdkp->capacity <<= 1; 2226 else if (sector_size == 256) 2227 sdkp->capacity >>= 1; 2228 2229 blk_queue_physical_block_size(sdp->request_queue, 2230 sdkp->physical_block_size); 2231 sdkp->device->sector_size = sector_size; 2232 } 2233 2234 /* called with buffer of length 512 */ 2235 static inline int 2236 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 2237 unsigned char *buffer, int len, struct scsi_mode_data *data, 2238 struct scsi_sense_hdr *sshdr) 2239 { 2240 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 2241 SD_TIMEOUT, SD_MAX_RETRIES, data, 2242 sshdr); 2243 } 2244 2245 /* 2246 * read write protect setting, if possible - called only in sd_revalidate_disk() 2247 * called with buffer of length SD_BUF_SIZE 2248 */ 2249 static void 2250 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 2251 { 2252 int res; 2253 struct scsi_device *sdp = sdkp->device; 2254 struct scsi_mode_data data; 2255 int old_wp = sdkp->write_prot; 2256 2257 set_disk_ro(sdkp->disk, 0); 2258 if (sdp->skip_ms_page_3f) { 2259 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 2260 return; 2261 } 2262 2263 if (sdp->use_192_bytes_for_3f) { 2264 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 2265 } else { 2266 /* 2267 * First attempt: ask for all pages (0x3F), but only 4 bytes. 2268 * We have to start carefully: some devices hang if we ask 2269 * for more than is available. 2270 */ 2271 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 2272 2273 /* 2274 * Second attempt: ask for page 0 When only page 0 is 2275 * implemented, a request for page 3F may return Sense Key 2276 * 5: Illegal Request, Sense Code 24: Invalid field in 2277 * CDB. 2278 */ 2279 if (!scsi_status_is_good(res)) 2280 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 2281 2282 /* 2283 * Third attempt: ask 255 bytes, as we did earlier. 2284 */ 2285 if (!scsi_status_is_good(res)) 2286 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 2287 &data, NULL); 2288 } 2289 2290 if (!scsi_status_is_good(res)) { 2291 sd_printk(KERN_WARNING, sdkp, 2292 "Test WP failed, assume Write Enabled\n"); 2293 } else { 2294 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 2295 set_disk_ro(sdkp->disk, sdkp->write_prot); 2296 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 2297 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 2298 sdkp->write_prot ? "on" : "off"); 2299 sd_printk(KERN_DEBUG, sdkp, 2300 "Mode Sense: %02x %02x %02x %02x\n", 2301 buffer[0], buffer[1], buffer[2], buffer[3]); 2302 } 2303 } 2304 } 2305 2306 /* 2307 * sd_read_cache_type - called only from sd_revalidate_disk() 2308 * called with buffer of length SD_BUF_SIZE 2309 */ 2310 static void 2311 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 2312 { 2313 int len = 0, res; 2314 struct scsi_device *sdp = sdkp->device; 2315 2316 int dbd; 2317 int modepage; 2318 int first_len; 2319 struct scsi_mode_data data; 2320 struct scsi_sense_hdr sshdr; 2321 int old_wce = sdkp->WCE; 2322 int old_rcd = sdkp->RCD; 2323 int old_dpofua = sdkp->DPOFUA; 2324 2325 2326 if (sdkp->cache_override) 2327 return; 2328 2329 first_len = 4; 2330 if (sdp->skip_ms_page_8) { 2331 if (sdp->type == TYPE_RBC) 2332 goto defaults; 2333 else { 2334 if (sdp->skip_ms_page_3f) 2335 goto defaults; 2336 modepage = 0x3F; 2337 if (sdp->use_192_bytes_for_3f) 2338 first_len = 192; 2339 dbd = 0; 2340 } 2341 } else if (sdp->type == TYPE_RBC) { 2342 modepage = 6; 2343 dbd = 8; 2344 } else { 2345 modepage = 8; 2346 dbd = 0; 2347 } 2348 2349 /* cautiously ask */ 2350 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len, 2351 &data, &sshdr); 2352 2353 if (!scsi_status_is_good(res)) 2354 goto bad_sense; 2355 2356 if (!data.header_length) { 2357 modepage = 6; 2358 first_len = 0; 2359 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 2360 } 2361 2362 /* that went OK, now ask for the proper length */ 2363 len = data.length; 2364 2365 /* 2366 * We're only interested in the first three bytes, actually. 2367 * But the data cache page is defined for the first 20. 2368 */ 2369 if (len < 3) 2370 goto bad_sense; 2371 else if (len > SD_BUF_SIZE) { 2372 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter " 2373 "data from %d to %d bytes\n", len, SD_BUF_SIZE); 2374 len = SD_BUF_SIZE; 2375 } 2376 if (modepage == 0x3F && sdp->use_192_bytes_for_3f) 2377 len = 192; 2378 2379 /* Get the data */ 2380 if (len > first_len) 2381 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, 2382 &data, &sshdr); 2383 2384 if (scsi_status_is_good(res)) { 2385 int offset = data.header_length + data.block_descriptor_length; 2386 2387 while (offset < len) { 2388 u8 page_code = buffer[offset] & 0x3F; 2389 u8 spf = buffer[offset] & 0x40; 2390 2391 if (page_code == 8 || page_code == 6) { 2392 /* We're interested only in the first 3 bytes. 2393 */ 2394 if (len - offset <= 2) { 2395 sd_printk(KERN_ERR, sdkp, "Incomplete " 2396 "mode parameter data\n"); 2397 goto defaults; 2398 } else { 2399 modepage = page_code; 2400 goto Page_found; 2401 } 2402 } else { 2403 /* Go to the next page */ 2404 if (spf && len - offset > 3) 2405 offset += 4 + (buffer[offset+2] << 8) + 2406 buffer[offset+3]; 2407 else if (!spf && len - offset > 1) 2408 offset += 2 + buffer[offset+1]; 2409 else { 2410 sd_printk(KERN_ERR, sdkp, "Incomplete " 2411 "mode parameter data\n"); 2412 goto defaults; 2413 } 2414 } 2415 } 2416 2417 if (modepage == 0x3F) { 2418 sd_printk(KERN_ERR, sdkp, "No Caching mode page " 2419 "present\n"); 2420 goto defaults; 2421 } else if ((buffer[offset] & 0x3f) != modepage) { 2422 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 2423 goto defaults; 2424 } 2425 Page_found: 2426 if (modepage == 8) { 2427 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 2428 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 2429 } else { 2430 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 2431 sdkp->RCD = 0; 2432 } 2433 2434 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 2435 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 2436 sd_printk(KERN_NOTICE, sdkp, 2437 "Uses READ/WRITE(6), disabling FUA\n"); 2438 sdkp->DPOFUA = 0; 2439 } 2440 2441 if (sdkp->first_scan || old_wce != sdkp->WCE || 2442 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 2443 sd_printk(KERN_NOTICE, sdkp, 2444 "Write cache: %s, read cache: %s, %s\n", 2445 sdkp->WCE ? "enabled" : "disabled", 2446 sdkp->RCD ? "disabled" : "enabled", 2447 sdkp->DPOFUA ? "supports DPO and FUA" 2448 : "doesn't support DPO or FUA"); 2449 2450 return; 2451 } 2452 2453 bad_sense: 2454 if (scsi_sense_valid(&sshdr) && 2455 sshdr.sense_key == ILLEGAL_REQUEST && 2456 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 2457 /* Invalid field in CDB */ 2458 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 2459 else 2460 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 2461 2462 defaults: 2463 if (sdp->wce_default_on) { 2464 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n"); 2465 sdkp->WCE = 1; 2466 } else { 2467 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 2468 sdkp->WCE = 0; 2469 } 2470 sdkp->RCD = 0; 2471 sdkp->DPOFUA = 0; 2472 } 2473 2474 /* 2475 * The ATO bit indicates whether the DIF application tag is available 2476 * for use by the operating system. 2477 */ 2478 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 2479 { 2480 int res, offset; 2481 struct scsi_device *sdp = sdkp->device; 2482 struct scsi_mode_data data; 2483 struct scsi_sense_hdr sshdr; 2484 2485 if (sdp->type != TYPE_DISK) 2486 return; 2487 2488 if (sdkp->protection_type == 0) 2489 return; 2490 2491 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 2492 SD_MAX_RETRIES, &data, &sshdr); 2493 2494 if (!scsi_status_is_good(res) || !data.header_length || 2495 data.length < 6) { 2496 sd_printk(KERN_WARNING, sdkp, 2497 "getting Control mode page failed, assume no ATO\n"); 2498 2499 if (scsi_sense_valid(&sshdr)) 2500 sd_print_sense_hdr(sdkp, &sshdr); 2501 2502 return; 2503 } 2504 2505 offset = data.header_length + data.block_descriptor_length; 2506 2507 if ((buffer[offset] & 0x3f) != 0x0a) { 2508 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 2509 return; 2510 } 2511 2512 if ((buffer[offset + 5] & 0x80) == 0) 2513 return; 2514 2515 sdkp->ATO = 1; 2516 2517 return; 2518 } 2519 2520 /** 2521 * sd_read_block_limits - Query disk device for preferred I/O sizes. 2522 * @disk: disk to query 2523 */ 2524 static void sd_read_block_limits(struct scsi_disk *sdkp) 2525 { 2526 unsigned int sector_sz = sdkp->device->sector_size; 2527 const int vpd_len = 64; 2528 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 2529 2530 if (!buffer || 2531 /* Block Limits VPD */ 2532 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 2533 goto out; 2534 2535 blk_queue_io_min(sdkp->disk->queue, 2536 get_unaligned_be16(&buffer[6]) * sector_sz); 2537 blk_queue_io_opt(sdkp->disk->queue, 2538 get_unaligned_be32(&buffer[12]) * sector_sz); 2539 2540 if (buffer[3] == 0x3c) { 2541 unsigned int lba_count, desc_count; 2542 2543 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]); 2544 2545 if (!sdkp->lbpme) 2546 goto out; 2547 2548 lba_count = get_unaligned_be32(&buffer[20]); 2549 desc_count = get_unaligned_be32(&buffer[24]); 2550 2551 if (lba_count && desc_count) 2552 sdkp->max_unmap_blocks = lba_count; 2553 2554 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]); 2555 2556 if (buffer[32] & 0x80) 2557 sdkp->unmap_alignment = 2558 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 2559 2560 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */ 2561 2562 if (sdkp->max_unmap_blocks) 2563 sd_config_discard(sdkp, SD_LBP_UNMAP); 2564 else 2565 sd_config_discard(sdkp, SD_LBP_WS16); 2566 2567 } else { /* LBP VPD page tells us what to use */ 2568 2569 if (sdkp->lbpu && sdkp->max_unmap_blocks) 2570 sd_config_discard(sdkp, SD_LBP_UNMAP); 2571 else if (sdkp->lbpws) 2572 sd_config_discard(sdkp, SD_LBP_WS16); 2573 else if (sdkp->lbpws10) 2574 sd_config_discard(sdkp, SD_LBP_WS10); 2575 else 2576 sd_config_discard(sdkp, SD_LBP_DISABLE); 2577 } 2578 } 2579 2580 out: 2581 kfree(buffer); 2582 } 2583 2584 /** 2585 * sd_read_block_characteristics - Query block dev. characteristics 2586 * @disk: disk to query 2587 */ 2588 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2589 { 2590 unsigned char *buffer; 2591 u16 rot; 2592 const int vpd_len = 64; 2593 2594 buffer = kmalloc(vpd_len, GFP_KERNEL); 2595 2596 if (!buffer || 2597 /* Block Device Characteristics VPD */ 2598 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2599 goto out; 2600 2601 rot = get_unaligned_be16(&buffer[4]); 2602 2603 if (rot == 1) 2604 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); 2605 2606 out: 2607 kfree(buffer); 2608 } 2609 2610 /** 2611 * sd_read_block_provisioning - Query provisioning VPD page 2612 * @disk: disk to query 2613 */ 2614 static void sd_read_block_provisioning(struct scsi_disk *sdkp) 2615 { 2616 unsigned char *buffer; 2617 const int vpd_len = 8; 2618 2619 if (sdkp->lbpme == 0) 2620 return; 2621 2622 buffer = kmalloc(vpd_len, GFP_KERNEL); 2623 2624 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len)) 2625 goto out; 2626 2627 sdkp->lbpvpd = 1; 2628 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */ 2629 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */ 2630 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */ 2631 2632 out: 2633 kfree(buffer); 2634 } 2635 2636 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer) 2637 { 2638 if (scsi_report_opcode(sdkp->device, buffer, SD_BUF_SIZE, 2639 WRITE_SAME_16)) 2640 sdkp->ws16 = 1; 2641 } 2642 2643 static int sd_try_extended_inquiry(struct scsi_device *sdp) 2644 { 2645 /* 2646 * Although VPD inquiries can go to SCSI-2 type devices, 2647 * some USB ones crash on receiving them, and the pages 2648 * we currently ask for are for SPC-3 and beyond 2649 */ 2650 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages) 2651 return 1; 2652 return 0; 2653 } 2654 2655 /** 2656 * sd_revalidate_disk - called the first time a new disk is seen, 2657 * performs disk spin up, read_capacity, etc. 2658 * @disk: struct gendisk we care about 2659 **/ 2660 static int sd_revalidate_disk(struct gendisk *disk) 2661 { 2662 struct scsi_disk *sdkp = scsi_disk(disk); 2663 struct scsi_device *sdp = sdkp->device; 2664 unsigned char *buffer; 2665 unsigned flush = 0; 2666 2667 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 2668 "sd_revalidate_disk\n")); 2669 2670 /* 2671 * If the device is offline, don't try and read capacity or any 2672 * of the other niceties. 2673 */ 2674 if (!scsi_device_online(sdp)) 2675 goto out; 2676 2677 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 2678 if (!buffer) { 2679 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 2680 "allocation failure.\n"); 2681 goto out; 2682 } 2683 2684 sd_spinup_disk(sdkp); 2685 2686 /* 2687 * Without media there is no reason to ask; moreover, some devices 2688 * react badly if we do. 2689 */ 2690 if (sdkp->media_present) { 2691 sd_read_capacity(sdkp, buffer); 2692 2693 if (sd_try_extended_inquiry(sdp)) { 2694 sd_read_block_provisioning(sdkp); 2695 sd_read_block_limits(sdkp); 2696 sd_read_block_characteristics(sdkp); 2697 } 2698 2699 sd_read_write_protect_flag(sdkp, buffer); 2700 sd_read_cache_type(sdkp, buffer); 2701 sd_read_app_tag_own(sdkp, buffer); 2702 sd_read_write_same(sdkp, buffer); 2703 } 2704 2705 sdkp->first_scan = 0; 2706 2707 /* 2708 * We now have all cache related info, determine how we deal 2709 * with flush requests. 2710 */ 2711 if (sdkp->WCE) { 2712 flush |= REQ_FLUSH; 2713 if (sdkp->DPOFUA) 2714 flush |= REQ_FUA; 2715 } 2716 2717 blk_queue_flush(sdkp->disk->queue, flush); 2718 2719 set_capacity(disk, sdkp->capacity); 2720 sd_config_write_same(sdkp); 2721 kfree(buffer); 2722 2723 out: 2724 return 0; 2725 } 2726 2727 /** 2728 * sd_unlock_native_capacity - unlock native capacity 2729 * @disk: struct gendisk to set capacity for 2730 * 2731 * Block layer calls this function if it detects that partitions 2732 * on @disk reach beyond the end of the device. If the SCSI host 2733 * implements ->unlock_native_capacity() method, it's invoked to 2734 * give it a chance to adjust the device capacity. 2735 * 2736 * CONTEXT: 2737 * Defined by block layer. Might sleep. 2738 */ 2739 static void sd_unlock_native_capacity(struct gendisk *disk) 2740 { 2741 struct scsi_device *sdev = scsi_disk(disk)->device; 2742 2743 if (sdev->host->hostt->unlock_native_capacity) 2744 sdev->host->hostt->unlock_native_capacity(sdev); 2745 } 2746 2747 /** 2748 * sd_format_disk_name - format disk name 2749 * @prefix: name prefix - ie. "sd" for SCSI disks 2750 * @index: index of the disk to format name for 2751 * @buf: output buffer 2752 * @buflen: length of the output buffer 2753 * 2754 * SCSI disk names starts at sda. The 26th device is sdz and the 2755 * 27th is sdaa. The last one for two lettered suffix is sdzz 2756 * which is followed by sdaaa. 2757 * 2758 * This is basically 26 base counting with one extra 'nil' entry 2759 * at the beginning from the second digit on and can be 2760 * determined using similar method as 26 base conversion with the 2761 * index shifted -1 after each digit is computed. 2762 * 2763 * CONTEXT: 2764 * Don't care. 2765 * 2766 * RETURNS: 2767 * 0 on success, -errno on failure. 2768 */ 2769 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 2770 { 2771 const int base = 'z' - 'a' + 1; 2772 char *begin = buf + strlen(prefix); 2773 char *end = buf + buflen; 2774 char *p; 2775 int unit; 2776 2777 p = end - 1; 2778 *p = '\0'; 2779 unit = base; 2780 do { 2781 if (p == begin) 2782 return -EINVAL; 2783 *--p = 'a' + (index % unit); 2784 index = (index / unit) - 1; 2785 } while (index >= 0); 2786 2787 memmove(begin, p, end - p); 2788 memcpy(buf, prefix, strlen(prefix)); 2789 2790 return 0; 2791 } 2792 2793 /* 2794 * The asynchronous part of sd_probe 2795 */ 2796 static void sd_probe_async(void *data, async_cookie_t cookie) 2797 { 2798 struct scsi_disk *sdkp = data; 2799 struct scsi_device *sdp; 2800 struct gendisk *gd; 2801 u32 index; 2802 struct device *dev; 2803 2804 sdp = sdkp->device; 2805 gd = sdkp->disk; 2806 index = sdkp->index; 2807 dev = &sdp->sdev_gendev; 2808 2809 gd->major = sd_major((index & 0xf0) >> 4); 2810 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 2811 gd->minors = SD_MINORS; 2812 2813 gd->fops = &sd_fops; 2814 gd->private_data = &sdkp->driver; 2815 gd->queue = sdkp->device->request_queue; 2816 2817 /* defaults, until the device tells us otherwise */ 2818 sdp->sector_size = 512; 2819 sdkp->capacity = 0; 2820 sdkp->media_present = 1; 2821 sdkp->write_prot = 0; 2822 sdkp->cache_override = 0; 2823 sdkp->WCE = 0; 2824 sdkp->RCD = 0; 2825 sdkp->ATO = 0; 2826 sdkp->first_scan = 1; 2827 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS; 2828 2829 sd_revalidate_disk(gd); 2830 2831 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); 2832 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn); 2833 2834 gd->driverfs_dev = &sdp->sdev_gendev; 2835 gd->flags = GENHD_FL_EXT_DEVT; 2836 if (sdp->removable) { 2837 gd->flags |= GENHD_FL_REMOVABLE; 2838 gd->events |= DISK_EVENT_MEDIA_CHANGE; 2839 } 2840 2841 add_disk(gd); 2842 if (sdkp->capacity) 2843 sd_dif_config_host(sdkp); 2844 2845 sd_revalidate_disk(gd); 2846 2847 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 2848 sdp->removable ? "removable " : ""); 2849 blk_pm_runtime_init(sdp->request_queue, dev); 2850 scsi_autopm_put_device(sdp); 2851 put_device(&sdkp->dev); 2852 } 2853 2854 /** 2855 * sd_probe - called during driver initialization and whenever a 2856 * new scsi device is attached to the system. It is called once 2857 * for each scsi device (not just disks) present. 2858 * @dev: pointer to device object 2859 * 2860 * Returns 0 if successful (or not interested in this scsi device 2861 * (e.g. scanner)); 1 when there is an error. 2862 * 2863 * Note: this function is invoked from the scsi mid-level. 2864 * This function sets up the mapping between a given 2865 * <host,channel,id,lun> (found in sdp) and new device name 2866 * (e.g. /dev/sda). More precisely it is the block device major 2867 * and minor number that is chosen here. 2868 * 2869 * Assume sd_probe is not re-entrant (for time being) 2870 * Also think about sd_probe() and sd_remove() running coincidentally. 2871 **/ 2872 static int sd_probe(struct device *dev) 2873 { 2874 struct scsi_device *sdp = to_scsi_device(dev); 2875 struct scsi_disk *sdkp; 2876 struct gendisk *gd; 2877 int index; 2878 int error; 2879 2880 error = -ENODEV; 2881 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 2882 goto out; 2883 2884 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 2885 "sd_probe\n")); 2886 2887 error = -ENOMEM; 2888 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 2889 if (!sdkp) 2890 goto out; 2891 2892 gd = alloc_disk(SD_MINORS); 2893 if (!gd) 2894 goto out_free; 2895 2896 do { 2897 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 2898 goto out_put; 2899 2900 spin_lock(&sd_index_lock); 2901 error = ida_get_new(&sd_index_ida, &index); 2902 spin_unlock(&sd_index_lock); 2903 } while (error == -EAGAIN); 2904 2905 if (error) { 2906 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n"); 2907 goto out_put; 2908 } 2909 2910 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 2911 if (error) { 2912 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n"); 2913 goto out_free_index; 2914 } 2915 2916 sdkp->device = sdp; 2917 sdkp->driver = &sd_template; 2918 sdkp->disk = gd; 2919 sdkp->index = index; 2920 atomic_set(&sdkp->openers, 0); 2921 atomic_set(&sdkp->device->ioerr_cnt, 0); 2922 2923 if (!sdp->request_queue->rq_timeout) { 2924 if (sdp->type != TYPE_MOD) 2925 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 2926 else 2927 blk_queue_rq_timeout(sdp->request_queue, 2928 SD_MOD_TIMEOUT); 2929 } 2930 2931 device_initialize(&sdkp->dev); 2932 sdkp->dev.parent = dev; 2933 sdkp->dev.class = &sd_disk_class; 2934 dev_set_name(&sdkp->dev, dev_name(dev)); 2935 2936 if (device_add(&sdkp->dev)) 2937 goto out_free_index; 2938 2939 get_device(dev); 2940 dev_set_drvdata(dev, sdkp); 2941 2942 get_device(&sdkp->dev); /* prevent release before async_schedule */ 2943 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain); 2944 2945 return 0; 2946 2947 out_free_index: 2948 spin_lock(&sd_index_lock); 2949 ida_remove(&sd_index_ida, index); 2950 spin_unlock(&sd_index_lock); 2951 out_put: 2952 put_disk(gd); 2953 out_free: 2954 kfree(sdkp); 2955 out: 2956 return error; 2957 } 2958 2959 /** 2960 * sd_remove - called whenever a scsi disk (previously recognized by 2961 * sd_probe) is detached from the system. It is called (potentially 2962 * multiple times) during sd module unload. 2963 * @sdp: pointer to mid level scsi device object 2964 * 2965 * Note: this function is invoked from the scsi mid-level. 2966 * This function potentially frees up a device name (e.g. /dev/sdc) 2967 * that could be re-used by a subsequent sd_probe(). 2968 * This function is not called when the built-in sd driver is "exit-ed". 2969 **/ 2970 static int sd_remove(struct device *dev) 2971 { 2972 struct scsi_disk *sdkp; 2973 2974 sdkp = dev_get_drvdata(dev); 2975 scsi_autopm_get_device(sdkp->device); 2976 2977 async_synchronize_full_domain(&scsi_sd_probe_domain); 2978 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); 2979 blk_queue_unprep_rq(sdkp->device->request_queue, NULL); 2980 device_del(&sdkp->dev); 2981 del_gendisk(sdkp->disk); 2982 sd_shutdown(dev); 2983 2984 mutex_lock(&sd_ref_mutex); 2985 dev_set_drvdata(dev, NULL); 2986 put_device(&sdkp->dev); 2987 mutex_unlock(&sd_ref_mutex); 2988 2989 return 0; 2990 } 2991 2992 /** 2993 * scsi_disk_release - Called to free the scsi_disk structure 2994 * @dev: pointer to embedded class device 2995 * 2996 * sd_ref_mutex must be held entering this routine. Because it is 2997 * called on last put, you should always use the scsi_disk_get() 2998 * scsi_disk_put() helpers which manipulate the semaphore directly 2999 * and never do a direct put_device. 3000 **/ 3001 static void scsi_disk_release(struct device *dev) 3002 { 3003 struct scsi_disk *sdkp = to_scsi_disk(dev); 3004 struct gendisk *disk = sdkp->disk; 3005 3006 spin_lock(&sd_index_lock); 3007 ida_remove(&sd_index_ida, sdkp->index); 3008 spin_unlock(&sd_index_lock); 3009 3010 disk->private_data = NULL; 3011 put_disk(disk); 3012 put_device(&sdkp->device->sdev_gendev); 3013 3014 kfree(sdkp); 3015 } 3016 3017 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 3018 { 3019 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 3020 struct scsi_sense_hdr sshdr; 3021 struct scsi_device *sdp = sdkp->device; 3022 int res; 3023 3024 if (start) 3025 cmd[4] |= 1; /* START */ 3026 3027 if (sdp->start_stop_pwr_cond) 3028 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 3029 3030 if (!scsi_device_online(sdp)) 3031 return -ENODEV; 3032 3033 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 3034 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM); 3035 if (res) { 3036 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 3037 sd_print_result(sdkp, res); 3038 if (driver_byte(res) & DRIVER_SENSE) 3039 sd_print_sense_hdr(sdkp, &sshdr); 3040 } 3041 3042 return res; 3043 } 3044 3045 /* 3046 * Send a SYNCHRONIZE CACHE instruction down to the device through 3047 * the normal SCSI command structure. Wait for the command to 3048 * complete. 3049 */ 3050 static void sd_shutdown(struct device *dev) 3051 { 3052 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 3053 3054 if (!sdkp) 3055 return; /* this can happen */ 3056 3057 if (pm_runtime_suspended(dev)) 3058 goto exit; 3059 3060 if (sdkp->WCE) { 3061 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3062 sd_sync_cache(sdkp); 3063 } 3064 3065 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 3066 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3067 sd_start_stop_device(sdkp, 0); 3068 } 3069 3070 exit: 3071 scsi_disk_put(sdkp); 3072 } 3073 3074 static int sd_suspend(struct device *dev) 3075 { 3076 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 3077 int ret = 0; 3078 3079 if (!sdkp) 3080 return 0; /* this can happen */ 3081 3082 if (sdkp->WCE) { 3083 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3084 ret = sd_sync_cache(sdkp); 3085 if (ret) 3086 goto done; 3087 } 3088 3089 if (sdkp->device->manage_start_stop) { 3090 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3091 ret = sd_start_stop_device(sdkp, 0); 3092 } 3093 3094 done: 3095 scsi_disk_put(sdkp); 3096 return ret; 3097 } 3098 3099 static int sd_resume(struct device *dev) 3100 { 3101 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 3102 int ret = 0; 3103 3104 if (!sdkp->device->manage_start_stop) 3105 goto done; 3106 3107 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 3108 ret = sd_start_stop_device(sdkp, 1); 3109 3110 done: 3111 scsi_disk_put(sdkp); 3112 return ret; 3113 } 3114 3115 /** 3116 * init_sd - entry point for this driver (both when built in or when 3117 * a module). 3118 * 3119 * Note: this function registers this driver with the scsi mid-level. 3120 **/ 3121 static int __init init_sd(void) 3122 { 3123 int majors = 0, i, err; 3124 3125 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 3126 3127 for (i = 0; i < SD_MAJORS; i++) 3128 if (register_blkdev(sd_major(i), "sd") == 0) 3129 majors++; 3130 3131 if (!majors) 3132 return -ENODEV; 3133 3134 err = class_register(&sd_disk_class); 3135 if (err) 3136 goto err_out; 3137 3138 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 3139 0, 0, NULL); 3140 if (!sd_cdb_cache) { 3141 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 3142 goto err_out_class; 3143 } 3144 3145 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 3146 if (!sd_cdb_pool) { 3147 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 3148 goto err_out_cache; 3149 } 3150 3151 err = scsi_register_driver(&sd_template.gendrv); 3152 if (err) 3153 goto err_out_driver; 3154 3155 return 0; 3156 3157 err_out_driver: 3158 mempool_destroy(sd_cdb_pool); 3159 3160 err_out_cache: 3161 kmem_cache_destroy(sd_cdb_cache); 3162 3163 err_out_class: 3164 class_unregister(&sd_disk_class); 3165 err_out: 3166 for (i = 0; i < SD_MAJORS; i++) 3167 unregister_blkdev(sd_major(i), "sd"); 3168 return err; 3169 } 3170 3171 /** 3172 * exit_sd - exit point for this driver (when it is a module). 3173 * 3174 * Note: this function unregisters this driver from the scsi mid-level. 3175 **/ 3176 static void __exit exit_sd(void) 3177 { 3178 int i; 3179 3180 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 3181 3182 scsi_unregister_driver(&sd_template.gendrv); 3183 mempool_destroy(sd_cdb_pool); 3184 kmem_cache_destroy(sd_cdb_cache); 3185 3186 class_unregister(&sd_disk_class); 3187 3188 for (i = 0; i < SD_MAJORS; i++) 3189 unregister_blkdev(sd_major(i), "sd"); 3190 } 3191 3192 module_init(init_sd); 3193 module_exit(exit_sd); 3194 3195 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 3196 struct scsi_sense_hdr *sshdr) 3197 { 3198 sd_printk(KERN_INFO, sdkp, " "); 3199 scsi_show_sense_hdr(sshdr); 3200 sd_printk(KERN_INFO, sdkp, " "); 3201 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 3202 } 3203 3204 static void sd_print_result(struct scsi_disk *sdkp, int result) 3205 { 3206 sd_printk(KERN_INFO, sdkp, " "); 3207 scsi_show_result(result); 3208 } 3209 3210