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