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 static const char temp[] = "temporary "; 146 int len; 147 148 if (sdp->type != TYPE_DISK) 149 /* no cache control on RBC devices; theoretically they 150 * can do it, but there's probably so many exceptions 151 * it's not worth the risk */ 152 return -EINVAL; 153 154 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) { 155 buf += sizeof(temp) - 1; 156 sdkp->cache_override = 1; 157 } else { 158 sdkp->cache_override = 0; 159 } 160 161 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 162 len = strlen(sd_cache_types[i]); 163 if (strncmp(sd_cache_types[i], buf, len) == 0 && 164 buf[len] == '\n') { 165 ct = i; 166 break; 167 } 168 } 169 if (ct < 0) 170 return -EINVAL; 171 rcd = ct & 0x01 ? 1 : 0; 172 wce = ct & 0x02 ? 1 : 0; 173 174 if (sdkp->cache_override) { 175 sdkp->WCE = wce; 176 sdkp->RCD = rcd; 177 return count; 178 } 179 180 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 181 SD_MAX_RETRIES, &data, NULL)) 182 return -EINVAL; 183 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 184 data.block_descriptor_length); 185 buffer_data = buffer + data.header_length + 186 data.block_descriptor_length; 187 buffer_data[2] &= ~0x05; 188 buffer_data[2] |= wce << 2 | rcd; 189 sp = buffer_data[0] & 0x80 ? 1 : 0; 190 191 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 192 SD_MAX_RETRIES, &data, &sshdr)) { 193 if (scsi_sense_valid(&sshdr)) 194 sd_print_sense_hdr(sdkp, &sshdr); 195 return -EINVAL; 196 } 197 revalidate_disk(sdkp->disk); 198 return count; 199 } 200 201 static ssize_t 202 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, 203 const char *buf, size_t count) 204 { 205 struct scsi_disk *sdkp = to_scsi_disk(dev); 206 struct scsi_device *sdp = sdkp->device; 207 208 if (!capable(CAP_SYS_ADMIN)) 209 return -EACCES; 210 211 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 212 213 return count; 214 } 215 216 static ssize_t 217 sd_store_allow_restart(struct device *dev, struct device_attribute *attr, 218 const char *buf, size_t count) 219 { 220 struct scsi_disk *sdkp = to_scsi_disk(dev); 221 struct scsi_device *sdp = sdkp->device; 222 223 if (!capable(CAP_SYS_ADMIN)) 224 return -EACCES; 225 226 if (sdp->type != TYPE_DISK) 227 return -EINVAL; 228 229 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 230 231 return count; 232 } 233 234 static ssize_t 235 sd_show_cache_type(struct device *dev, struct device_attribute *attr, 236 char *buf) 237 { 238 struct scsi_disk *sdkp = to_scsi_disk(dev); 239 int ct = sdkp->RCD + 2*sdkp->WCE; 240 241 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); 242 } 243 244 static ssize_t 245 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) 246 { 247 struct scsi_disk *sdkp = to_scsi_disk(dev); 248 249 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); 250 } 251 252 static ssize_t 253 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, 254 char *buf) 255 { 256 struct scsi_disk *sdkp = to_scsi_disk(dev); 257 struct scsi_device *sdp = sdkp->device; 258 259 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); 260 } 261 262 static ssize_t 263 sd_show_allow_restart(struct device *dev, struct device_attribute *attr, 264 char *buf) 265 { 266 struct scsi_disk *sdkp = to_scsi_disk(dev); 267 268 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); 269 } 270 271 static ssize_t 272 sd_show_protection_type(struct device *dev, struct device_attribute *attr, 273 char *buf) 274 { 275 struct scsi_disk *sdkp = to_scsi_disk(dev); 276 277 return snprintf(buf, 20, "%u\n", sdkp->protection_type); 278 } 279 280 static ssize_t 281 sd_store_protection_type(struct device *dev, struct device_attribute *attr, 282 const char *buf, size_t count) 283 { 284 struct scsi_disk *sdkp = to_scsi_disk(dev); 285 unsigned int val; 286 int err; 287 288 if (!capable(CAP_SYS_ADMIN)) 289 return -EACCES; 290 291 err = kstrtouint(buf, 10, &val); 292 293 if (err) 294 return err; 295 296 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION) 297 sdkp->protection_type = val; 298 299 return count; 300 } 301 302 static ssize_t 303 sd_show_protection_mode(struct device *dev, struct device_attribute *attr, 304 char *buf) 305 { 306 struct scsi_disk *sdkp = to_scsi_disk(dev); 307 struct scsi_device *sdp = sdkp->device; 308 unsigned int dif, dix; 309 310 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 311 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type); 312 313 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) { 314 dif = 0; 315 dix = 1; 316 } 317 318 if (!dif && !dix) 319 return snprintf(buf, 20, "none\n"); 320 321 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif); 322 } 323 324 static ssize_t 325 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, 326 char *buf) 327 { 328 struct scsi_disk *sdkp = to_scsi_disk(dev); 329 330 return snprintf(buf, 20, "%u\n", sdkp->ATO); 331 } 332 333 static ssize_t 334 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr, 335 char *buf) 336 { 337 struct scsi_disk *sdkp = to_scsi_disk(dev); 338 339 return snprintf(buf, 20, "%u\n", sdkp->lbpme); 340 } 341 342 static const char *lbp_mode[] = { 343 [SD_LBP_FULL] = "full", 344 [SD_LBP_UNMAP] = "unmap", 345 [SD_LBP_WS16] = "writesame_16", 346 [SD_LBP_WS10] = "writesame_10", 347 [SD_LBP_ZERO] = "writesame_zero", 348 [SD_LBP_DISABLE] = "disabled", 349 }; 350 351 static ssize_t 352 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr, 353 char *buf) 354 { 355 struct scsi_disk *sdkp = to_scsi_disk(dev); 356 357 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]); 358 } 359 360 static ssize_t 361 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr, 362 const char *buf, size_t count) 363 { 364 struct scsi_disk *sdkp = to_scsi_disk(dev); 365 struct scsi_device *sdp = sdkp->device; 366 367 if (!capable(CAP_SYS_ADMIN)) 368 return -EACCES; 369 370 if (sdp->type != TYPE_DISK) 371 return -EINVAL; 372 373 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20)) 374 sd_config_discard(sdkp, SD_LBP_UNMAP); 375 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20)) 376 sd_config_discard(sdkp, SD_LBP_WS16); 377 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20)) 378 sd_config_discard(sdkp, SD_LBP_WS10); 379 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20)) 380 sd_config_discard(sdkp, SD_LBP_ZERO); 381 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20)) 382 sd_config_discard(sdkp, SD_LBP_DISABLE); 383 else 384 return -EINVAL; 385 386 return count; 387 } 388 389 static ssize_t 390 sd_show_max_medium_access_timeouts(struct device *dev, 391 struct device_attribute *attr, char *buf) 392 { 393 struct scsi_disk *sdkp = to_scsi_disk(dev); 394 395 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts); 396 } 397 398 static ssize_t 399 sd_store_max_medium_access_timeouts(struct device *dev, 400 struct device_attribute *attr, 401 const char *buf, size_t count) 402 { 403 struct scsi_disk *sdkp = to_scsi_disk(dev); 404 int err; 405 406 if (!capable(CAP_SYS_ADMIN)) 407 return -EACCES; 408 409 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts); 410 411 return err ? err : count; 412 } 413 414 static ssize_t 415 sd_show_write_same_blocks(struct device *dev, struct device_attribute *attr, 416 char *buf) 417 { 418 struct scsi_disk *sdkp = to_scsi_disk(dev); 419 420 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks); 421 } 422 423 static ssize_t 424 sd_store_write_same_blocks(struct device *dev, struct device_attribute *attr, 425 const char *buf, size_t count) 426 { 427 struct scsi_disk *sdkp = to_scsi_disk(dev); 428 struct scsi_device *sdp = sdkp->device; 429 unsigned long max; 430 int err; 431 432 if (!capable(CAP_SYS_ADMIN)) 433 return -EACCES; 434 435 if (sdp->type != TYPE_DISK) 436 return -EINVAL; 437 438 err = kstrtoul(buf, 10, &max); 439 440 if (err) 441 return err; 442 443 if (max == 0) 444 sdp->no_write_same = 1; 445 else if (max <= SD_MAX_WS16_BLOCKS) { 446 sdp->no_write_same = 0; 447 sdkp->max_ws_blocks = max; 448 } 449 450 sd_config_write_same(sdkp); 451 452 return count; 453 } 454 455 static struct device_attribute sd_disk_attrs[] = { 456 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, 457 sd_store_cache_type), 458 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), 459 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, 460 sd_store_allow_restart), 461 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, 462 sd_store_manage_start_stop), 463 __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type, 464 sd_store_protection_type), 465 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL), 466 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), 467 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL), 468 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode, 469 sd_store_provisioning_mode), 470 __ATTR(max_write_same_blocks, S_IRUGO|S_IWUSR, 471 sd_show_write_same_blocks, sd_store_write_same_blocks), 472 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR, 473 sd_show_max_medium_access_timeouts, 474 sd_store_max_medium_access_timeouts), 475 __ATTR_NULL, 476 }; 477 478 static struct class sd_disk_class = { 479 .name = "scsi_disk", 480 .owner = THIS_MODULE, 481 .dev_release = scsi_disk_release, 482 .dev_attrs = sd_disk_attrs, 483 }; 484 485 static const struct dev_pm_ops sd_pm_ops = { 486 .suspend = sd_suspend, 487 .resume = sd_resume, 488 .poweroff = sd_suspend, 489 .restore = sd_resume, 490 .runtime_suspend = sd_suspend, 491 .runtime_resume = sd_resume, 492 }; 493 494 static struct scsi_driver sd_template = { 495 .owner = THIS_MODULE, 496 .gendrv = { 497 .name = "sd", 498 .probe = sd_probe, 499 .remove = sd_remove, 500 .shutdown = sd_shutdown, 501 .pm = &sd_pm_ops, 502 }, 503 .rescan = sd_rescan, 504 .done = sd_done, 505 .eh_action = sd_eh_action, 506 }; 507 508 /* 509 * Dummy kobj_map->probe function. 510 * The default ->probe function will call modprobe, which is 511 * pointless as this module is already loaded. 512 */ 513 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data) 514 { 515 return NULL; 516 } 517 518 /* 519 * Device no to disk mapping: 520 * 521 * major disc2 disc p1 522 * |............|.............|....|....| <- dev_t 523 * 31 20 19 8 7 4 3 0 524 * 525 * Inside a major, we have 16k disks, however mapped non- 526 * contiguously. The first 16 disks are for major0, the next 527 * ones with major1, ... Disk 256 is for major0 again, disk 272 528 * for major1, ... 529 * As we stay compatible with our numbering scheme, we can reuse 530 * the well-know SCSI majors 8, 65--71, 136--143. 531 */ 532 static int sd_major(int major_idx) 533 { 534 switch (major_idx) { 535 case 0: 536 return SCSI_DISK0_MAJOR; 537 case 1 ... 7: 538 return SCSI_DISK1_MAJOR + major_idx - 1; 539 case 8 ... 15: 540 return SCSI_DISK8_MAJOR + major_idx - 8; 541 default: 542 BUG(); 543 return 0; /* shut up gcc */ 544 } 545 } 546 547 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) 548 { 549 struct scsi_disk *sdkp = NULL; 550 551 if (disk->private_data) { 552 sdkp = scsi_disk(disk); 553 if (scsi_device_get(sdkp->device) == 0) 554 get_device(&sdkp->dev); 555 else 556 sdkp = NULL; 557 } 558 return sdkp; 559 } 560 561 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 562 { 563 struct scsi_disk *sdkp; 564 565 mutex_lock(&sd_ref_mutex); 566 sdkp = __scsi_disk_get(disk); 567 mutex_unlock(&sd_ref_mutex); 568 return sdkp; 569 } 570 571 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) 572 { 573 struct scsi_disk *sdkp; 574 575 mutex_lock(&sd_ref_mutex); 576 sdkp = dev_get_drvdata(dev); 577 if (sdkp) 578 sdkp = __scsi_disk_get(sdkp->disk); 579 mutex_unlock(&sd_ref_mutex); 580 return sdkp; 581 } 582 583 static void scsi_disk_put(struct scsi_disk *sdkp) 584 { 585 struct scsi_device *sdev = sdkp->device; 586 587 mutex_lock(&sd_ref_mutex); 588 put_device(&sdkp->dev); 589 scsi_device_put(sdev); 590 mutex_unlock(&sd_ref_mutex); 591 } 592 593 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif) 594 { 595 unsigned int prot_op = SCSI_PROT_NORMAL; 596 unsigned int dix = scsi_prot_sg_count(scmd); 597 598 if (scmd->sc_data_direction == DMA_FROM_DEVICE) { 599 if (dif && dix) 600 prot_op = SCSI_PROT_READ_PASS; 601 else if (dif && !dix) 602 prot_op = SCSI_PROT_READ_STRIP; 603 else if (!dif && dix) 604 prot_op = SCSI_PROT_READ_INSERT; 605 } else { 606 if (dif && dix) 607 prot_op = SCSI_PROT_WRITE_PASS; 608 else if (dif && !dix) 609 prot_op = SCSI_PROT_WRITE_INSERT; 610 else if (!dif && dix) 611 prot_op = SCSI_PROT_WRITE_STRIP; 612 } 613 614 scsi_set_prot_op(scmd, prot_op); 615 scsi_set_prot_type(scmd, dif); 616 } 617 618 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) 619 { 620 struct request_queue *q = sdkp->disk->queue; 621 unsigned int logical_block_size = sdkp->device->sector_size; 622 unsigned int max_blocks = 0; 623 624 q->limits.discard_zeroes_data = sdkp->lbprz; 625 q->limits.discard_alignment = sdkp->unmap_alignment * 626 logical_block_size; 627 q->limits.discard_granularity = 628 max(sdkp->physical_block_size, 629 sdkp->unmap_granularity * logical_block_size); 630 631 sdkp->provisioning_mode = mode; 632 633 switch (mode) { 634 635 case SD_LBP_DISABLE: 636 q->limits.max_discard_sectors = 0; 637 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); 638 return; 639 640 case SD_LBP_UNMAP: 641 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 642 (u32)SD_MAX_WS16_BLOCKS); 643 break; 644 645 case SD_LBP_WS16: 646 max_blocks = min_not_zero(sdkp->max_ws_blocks, 647 (u32)SD_MAX_WS16_BLOCKS); 648 break; 649 650 case SD_LBP_WS10: 651 max_blocks = min_not_zero(sdkp->max_ws_blocks, 652 (u32)SD_MAX_WS10_BLOCKS); 653 break; 654 655 case SD_LBP_ZERO: 656 max_blocks = min_not_zero(sdkp->max_ws_blocks, 657 (u32)SD_MAX_WS10_BLOCKS); 658 q->limits.discard_zeroes_data = 1; 659 break; 660 } 661 662 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9); 663 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); 664 } 665 666 /** 667 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device 668 * @sdp: scsi device to operate one 669 * @rq: Request to prepare 670 * 671 * Will issue either UNMAP or WRITE SAME(16) depending on preference 672 * indicated by target device. 673 **/ 674 static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq) 675 { 676 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 677 sector_t sector = blk_rq_pos(rq); 678 unsigned int nr_sectors = blk_rq_sectors(rq); 679 unsigned int nr_bytes = blk_rq_bytes(rq); 680 unsigned int len; 681 int ret; 682 char *buf; 683 struct page *page; 684 685 sector >>= ilog2(sdp->sector_size) - 9; 686 nr_sectors >>= ilog2(sdp->sector_size) - 9; 687 rq->timeout = SD_TIMEOUT; 688 689 memset(rq->cmd, 0, rq->cmd_len); 690 691 page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 692 if (!page) 693 return BLKPREP_DEFER; 694 695 switch (sdkp->provisioning_mode) { 696 case SD_LBP_UNMAP: 697 buf = page_address(page); 698 699 rq->cmd_len = 10; 700 rq->cmd[0] = UNMAP; 701 rq->cmd[8] = 24; 702 703 put_unaligned_be16(6 + 16, &buf[0]); 704 put_unaligned_be16(16, &buf[2]); 705 put_unaligned_be64(sector, &buf[8]); 706 put_unaligned_be32(nr_sectors, &buf[16]); 707 708 len = 24; 709 break; 710 711 case SD_LBP_WS16: 712 rq->cmd_len = 16; 713 rq->cmd[0] = WRITE_SAME_16; 714 rq->cmd[1] = 0x8; /* UNMAP */ 715 put_unaligned_be64(sector, &rq->cmd[2]); 716 put_unaligned_be32(nr_sectors, &rq->cmd[10]); 717 718 len = sdkp->device->sector_size; 719 break; 720 721 case SD_LBP_WS10: 722 case SD_LBP_ZERO: 723 rq->cmd_len = 10; 724 rq->cmd[0] = WRITE_SAME; 725 if (sdkp->provisioning_mode == SD_LBP_WS10) 726 rq->cmd[1] = 0x8; /* UNMAP */ 727 put_unaligned_be32(sector, &rq->cmd[2]); 728 put_unaligned_be16(nr_sectors, &rq->cmd[7]); 729 730 len = sdkp->device->sector_size; 731 break; 732 733 default: 734 ret = BLKPREP_KILL; 735 goto out; 736 } 737 738 blk_add_request_payload(rq, page, len); 739 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 740 rq->buffer = page_address(page); 741 rq->__data_len = nr_bytes; 742 743 out: 744 if (ret != BLKPREP_OK) { 745 __free_page(page); 746 rq->buffer = NULL; 747 } 748 return ret; 749 } 750 751 static void sd_config_write_same(struct scsi_disk *sdkp) 752 { 753 struct request_queue *q = sdkp->disk->queue; 754 unsigned int logical_block_size = sdkp->device->sector_size; 755 756 if (sdkp->device->no_write_same) { 757 sdkp->max_ws_blocks = 0; 758 goto out; 759 } 760 761 /* Some devices can not handle block counts above 0xffff despite 762 * supporting WRITE SAME(16). Consequently we default to 64k 763 * blocks per I/O unless the device explicitly advertises a 764 * bigger limit. 765 */ 766 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS) 767 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 768 (u32)SD_MAX_WS16_BLOCKS); 769 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes) 770 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 771 (u32)SD_MAX_WS10_BLOCKS); 772 else { 773 sdkp->device->no_write_same = 1; 774 sdkp->max_ws_blocks = 0; 775 } 776 777 out: 778 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks * 779 (logical_block_size >> 9)); 780 } 781 782 /** 783 * sd_setup_write_same_cmnd - write the same data to multiple blocks 784 * @sdp: scsi device to operate one 785 * @rq: Request to prepare 786 * 787 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on 788 * preference indicated by target device. 789 **/ 790 static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq) 791 { 792 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 793 struct bio *bio = rq->bio; 794 sector_t sector = blk_rq_pos(rq); 795 unsigned int nr_sectors = blk_rq_sectors(rq); 796 unsigned int nr_bytes = blk_rq_bytes(rq); 797 int ret; 798 799 if (sdkp->device->no_write_same) 800 return BLKPREP_KILL; 801 802 BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size); 803 804 sector >>= ilog2(sdp->sector_size) - 9; 805 nr_sectors >>= ilog2(sdp->sector_size) - 9; 806 807 rq->__data_len = sdp->sector_size; 808 rq->timeout = SD_WRITE_SAME_TIMEOUT; 809 memset(rq->cmd, 0, rq->cmd_len); 810 811 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) { 812 rq->cmd_len = 16; 813 rq->cmd[0] = WRITE_SAME_16; 814 put_unaligned_be64(sector, &rq->cmd[2]); 815 put_unaligned_be32(nr_sectors, &rq->cmd[10]); 816 } else { 817 rq->cmd_len = 10; 818 rq->cmd[0] = WRITE_SAME; 819 put_unaligned_be32(sector, &rq->cmd[2]); 820 put_unaligned_be16(nr_sectors, &rq->cmd[7]); 821 } 822 823 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 824 rq->__data_len = nr_bytes; 825 826 return ret; 827 } 828 829 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq) 830 { 831 rq->timeout = SD_FLUSH_TIMEOUT; 832 rq->retries = SD_MAX_RETRIES; 833 rq->cmd[0] = SYNCHRONIZE_CACHE; 834 rq->cmd_len = 10; 835 836 return scsi_setup_blk_pc_cmnd(sdp, rq); 837 } 838 839 static void sd_unprep_fn(struct request_queue *q, struct request *rq) 840 { 841 struct scsi_cmnd *SCpnt = rq->special; 842 843 if (rq->cmd_flags & REQ_DISCARD) { 844 free_page((unsigned long)rq->buffer); 845 rq->buffer = NULL; 846 } 847 if (SCpnt->cmnd != rq->cmd) { 848 mempool_free(SCpnt->cmnd, sd_cdb_pool); 849 SCpnt->cmnd = NULL; 850 SCpnt->cmd_len = 0; 851 } 852 } 853 854 /** 855 * sd_prep_fn - build a scsi (read or write) command from 856 * information in the request structure. 857 * @SCpnt: pointer to mid-level's per scsi command structure that 858 * contains request and into which the scsi command is written 859 * 860 * Returns 1 if successful and 0 if error (or cannot be done now). 861 **/ 862 static int sd_prep_fn(struct request_queue *q, struct request *rq) 863 { 864 struct scsi_cmnd *SCpnt; 865 struct scsi_device *sdp = q->queuedata; 866 struct gendisk *disk = rq->rq_disk; 867 struct scsi_disk *sdkp; 868 sector_t block = blk_rq_pos(rq); 869 sector_t threshold; 870 unsigned int this_count = blk_rq_sectors(rq); 871 int ret, host_dif; 872 unsigned char protect; 873 874 /* 875 * Discard request come in as REQ_TYPE_FS but we turn them into 876 * block PC requests to make life easier. 877 */ 878 if (rq->cmd_flags & REQ_DISCARD) { 879 ret = sd_setup_discard_cmnd(sdp, rq); 880 goto out; 881 } else if (rq->cmd_flags & REQ_WRITE_SAME) { 882 ret = sd_setup_write_same_cmnd(sdp, rq); 883 goto out; 884 } else if (rq->cmd_flags & REQ_FLUSH) { 885 ret = scsi_setup_flush_cmnd(sdp, rq); 886 goto out; 887 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 888 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 889 goto out; 890 } else if (rq->cmd_type != REQ_TYPE_FS) { 891 ret = BLKPREP_KILL; 892 goto out; 893 } 894 ret = scsi_setup_fs_cmnd(sdp, rq); 895 if (ret != BLKPREP_OK) 896 goto out; 897 SCpnt = rq->special; 898 sdkp = scsi_disk(disk); 899 900 /* from here on until we're complete, any goto out 901 * is used for a killable error condition */ 902 ret = BLKPREP_KILL; 903 904 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 905 "sd_prep_fn: block=%llu, " 906 "count=%d\n", 907 (unsigned long long)block, 908 this_count)); 909 910 if (!sdp || !scsi_device_online(sdp) || 911 block + blk_rq_sectors(rq) > get_capacity(disk)) { 912 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 913 "Finishing %u sectors\n", 914 blk_rq_sectors(rq))); 915 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 916 "Retry with 0x%p\n", SCpnt)); 917 goto out; 918 } 919 920 if (sdp->changed) { 921 /* 922 * quietly refuse to do anything to a changed disc until 923 * the changed bit has been reset 924 */ 925 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */ 926 goto out; 927 } 928 929 /* 930 * Some SD card readers can't handle multi-sector accesses which touch 931 * the last one or two hardware sectors. Split accesses as needed. 932 */ 933 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 934 (sdp->sector_size / 512); 935 936 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 937 if (block < threshold) { 938 /* Access up to the threshold but not beyond */ 939 this_count = threshold - block; 940 } else { 941 /* Access only a single hardware sector */ 942 this_count = sdp->sector_size / 512; 943 } 944 } 945 946 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 947 (unsigned long long)block)); 948 949 /* 950 * If we have a 1K hardware sectorsize, prevent access to single 951 * 512 byte sectors. In theory we could handle this - in fact 952 * the scsi cdrom driver must be able to handle this because 953 * we typically use 1K blocksizes, and cdroms typically have 954 * 2K hardware sectorsizes. Of course, things are simpler 955 * with the cdrom, since it is read-only. For performance 956 * reasons, the filesystems should be able to handle this 957 * and not force the scsi disk driver to use bounce buffers 958 * for this. 959 */ 960 if (sdp->sector_size == 1024) { 961 if ((block & 1) || (blk_rq_sectors(rq) & 1)) { 962 scmd_printk(KERN_ERR, SCpnt, 963 "Bad block number requested\n"); 964 goto out; 965 } else { 966 block = block >> 1; 967 this_count = this_count >> 1; 968 } 969 } 970 if (sdp->sector_size == 2048) { 971 if ((block & 3) || (blk_rq_sectors(rq) & 3)) { 972 scmd_printk(KERN_ERR, SCpnt, 973 "Bad block number requested\n"); 974 goto out; 975 } else { 976 block = block >> 2; 977 this_count = this_count >> 2; 978 } 979 } 980 if (sdp->sector_size == 4096) { 981 if ((block & 7) || (blk_rq_sectors(rq) & 7)) { 982 scmd_printk(KERN_ERR, SCpnt, 983 "Bad block number requested\n"); 984 goto out; 985 } else { 986 block = block >> 3; 987 this_count = this_count >> 3; 988 } 989 } 990 if (rq_data_dir(rq) == WRITE) { 991 if (!sdp->writeable) { 992 goto out; 993 } 994 SCpnt->cmnd[0] = WRITE_6; 995 SCpnt->sc_data_direction = DMA_TO_DEVICE; 996 997 if (blk_integrity_rq(rq)) 998 sd_dif_prepare(rq, block, sdp->sector_size); 999 1000 } else if (rq_data_dir(rq) == READ) { 1001 SCpnt->cmnd[0] = READ_6; 1002 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 1003 } else { 1004 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); 1005 goto out; 1006 } 1007 1008 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 1009 "%s %d/%u 512 byte blocks.\n", 1010 (rq_data_dir(rq) == WRITE) ? 1011 "writing" : "reading", this_count, 1012 blk_rq_sectors(rq))); 1013 1014 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ 1015 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 1016 if (host_dif) 1017 protect = 1 << 5; 1018 else 1019 protect = 0; 1020 1021 if (host_dif == SD_DIF_TYPE2_PROTECTION) { 1022 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); 1023 1024 if (unlikely(SCpnt->cmnd == NULL)) { 1025 ret = BLKPREP_DEFER; 1026 goto out; 1027 } 1028 1029 SCpnt->cmd_len = SD_EXT_CDB_SIZE; 1030 memset(SCpnt->cmnd, 0, SCpnt->cmd_len); 1031 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; 1032 SCpnt->cmnd[7] = 0x18; 1033 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; 1034 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1035 1036 /* LBA */ 1037 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 1038 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 1039 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 1040 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 1041 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; 1042 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; 1043 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; 1044 SCpnt->cmnd[19] = (unsigned char) block & 0xff; 1045 1046 /* Expected Indirect LBA */ 1047 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; 1048 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; 1049 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; 1050 SCpnt->cmnd[23] = (unsigned char) block & 0xff; 1051 1052 /* Transfer length */ 1053 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; 1054 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; 1055 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; 1056 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; 1057 } else if (sdp->use_16_for_rw) { 1058 SCpnt->cmnd[0] += READ_16 - READ_6; 1059 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1060 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 1061 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 1062 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 1063 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 1064 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 1065 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 1066 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 1067 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 1068 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 1069 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 1070 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 1071 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 1072 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 1073 } else if ((this_count > 0xff) || (block > 0x1fffff) || 1074 scsi_device_protection(SCpnt->device) || 1075 SCpnt->device->use_10_for_rw) { 1076 if (this_count > 0xffff) 1077 this_count = 0xffff; 1078 1079 SCpnt->cmnd[0] += READ_10 - READ_6; 1080 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1081 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 1082 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 1083 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 1084 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 1085 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 1086 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 1087 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 1088 } else { 1089 if (unlikely(rq->cmd_flags & REQ_FUA)) { 1090 /* 1091 * This happens only if this drive failed 1092 * 10byte rw command with ILLEGAL_REQUEST 1093 * during operation and thus turned off 1094 * use_10_for_rw. 1095 */ 1096 scmd_printk(KERN_ERR, SCpnt, 1097 "FUA write on READ/WRITE(6) drive\n"); 1098 goto out; 1099 } 1100 1101 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 1102 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 1103 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 1104 SCpnt->cmnd[4] = (unsigned char) this_count; 1105 SCpnt->cmnd[5] = 0; 1106 } 1107 SCpnt->sdb.length = this_count * sdp->sector_size; 1108 1109 /* If DIF or DIX is enabled, tell HBA how to handle request */ 1110 if (host_dif || scsi_prot_sg_count(SCpnt)) 1111 sd_prot_op(SCpnt, host_dif); 1112 1113 /* 1114 * We shouldn't disconnect in the middle of a sector, so with a dumb 1115 * host adapter, it's safe to assume that we can at least transfer 1116 * this many bytes between each connect / disconnect. 1117 */ 1118 SCpnt->transfersize = sdp->sector_size; 1119 SCpnt->underflow = this_count << 9; 1120 SCpnt->allowed = SD_MAX_RETRIES; 1121 1122 /* 1123 * This indicates that the command is ready from our end to be 1124 * queued. 1125 */ 1126 ret = BLKPREP_OK; 1127 out: 1128 return scsi_prep_return(q, rq, ret); 1129 } 1130 1131 /** 1132 * sd_open - open a scsi disk device 1133 * @inode: only i_rdev member may be used 1134 * @filp: only f_mode and f_flags may be used 1135 * 1136 * Returns 0 if successful. Returns a negated errno value in case 1137 * of error. 1138 * 1139 * Note: This can be called from a user context (e.g. fsck(1) ) 1140 * or from within the kernel (e.g. as a result of a mount(1) ). 1141 * In the latter case @inode and @filp carry an abridged amount 1142 * of information as noted above. 1143 * 1144 * Locking: called with bdev->bd_mutex held. 1145 **/ 1146 static int sd_open(struct block_device *bdev, fmode_t mode) 1147 { 1148 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 1149 struct scsi_device *sdev; 1150 int retval; 1151 1152 if (!sdkp) 1153 return -ENXIO; 1154 1155 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 1156 1157 sdev = sdkp->device; 1158 1159 /* 1160 * If the device is in error recovery, wait until it is done. 1161 * If the device is offline, then disallow any access to it. 1162 */ 1163 retval = -ENXIO; 1164 if (!scsi_block_when_processing_errors(sdev)) 1165 goto error_out; 1166 1167 if (sdev->removable || sdkp->write_prot) 1168 check_disk_change(bdev); 1169 1170 /* 1171 * If the drive is empty, just let the open fail. 1172 */ 1173 retval = -ENOMEDIUM; 1174 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 1175 goto error_out; 1176 1177 /* 1178 * If the device has the write protect tab set, have the open fail 1179 * if the user expects to be able to write to the thing. 1180 */ 1181 retval = -EROFS; 1182 if (sdkp->write_prot && (mode & FMODE_WRITE)) 1183 goto error_out; 1184 1185 /* 1186 * It is possible that the disk changing stuff resulted in 1187 * the device being taken offline. If this is the case, 1188 * report this to the user, and don't pretend that the 1189 * open actually succeeded. 1190 */ 1191 retval = -ENXIO; 1192 if (!scsi_device_online(sdev)) 1193 goto error_out; 1194 1195 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { 1196 if (scsi_block_when_processing_errors(sdev)) 1197 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 1198 } 1199 1200 return 0; 1201 1202 error_out: 1203 scsi_disk_put(sdkp); 1204 return retval; 1205 } 1206 1207 /** 1208 * sd_release - invoked when the (last) close(2) is called on this 1209 * scsi disk. 1210 * @inode: only i_rdev member may be used 1211 * @filp: only f_mode and f_flags may be used 1212 * 1213 * Returns 0. 1214 * 1215 * Note: may block (uninterruptible) if error recovery is underway 1216 * on this disk. 1217 * 1218 * Locking: called with bdev->bd_mutex held. 1219 **/ 1220 static void sd_release(struct gendisk *disk, fmode_t mode) 1221 { 1222 struct scsi_disk *sdkp = scsi_disk(disk); 1223 struct scsi_device *sdev = sdkp->device; 1224 1225 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 1226 1227 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) { 1228 if (scsi_block_when_processing_errors(sdev)) 1229 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 1230 } 1231 1232 /* 1233 * XXX and what if there are packets in flight and this close() 1234 * XXX is followed by a "rmmod sd_mod"? 1235 */ 1236 1237 scsi_disk_put(sdkp); 1238 } 1239 1240 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 1241 { 1242 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 1243 struct scsi_device *sdp = sdkp->device; 1244 struct Scsi_Host *host = sdp->host; 1245 int diskinfo[4]; 1246 1247 /* default to most commonly used values */ 1248 diskinfo[0] = 0x40; /* 1 << 6 */ 1249 diskinfo[1] = 0x20; /* 1 << 5 */ 1250 diskinfo[2] = sdkp->capacity >> 11; 1251 1252 /* override with calculated, extended default, or driver values */ 1253 if (host->hostt->bios_param) 1254 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 1255 else 1256 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 1257 1258 geo->heads = diskinfo[0]; 1259 geo->sectors = diskinfo[1]; 1260 geo->cylinders = diskinfo[2]; 1261 return 0; 1262 } 1263 1264 /** 1265 * sd_ioctl - process an ioctl 1266 * @inode: only i_rdev/i_bdev members may be used 1267 * @filp: only f_mode and f_flags may be used 1268 * @cmd: ioctl command number 1269 * @arg: this is third argument given to ioctl(2) system call. 1270 * Often contains a pointer. 1271 * 1272 * Returns 0 if successful (some ioctls return positive numbers on 1273 * success as well). Returns a negated errno value in case of error. 1274 * 1275 * Note: most ioctls are forward onto the block subsystem or further 1276 * down in the scsi subsystem. 1277 **/ 1278 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 1279 unsigned int cmd, unsigned long arg) 1280 { 1281 struct gendisk *disk = bdev->bd_disk; 1282 struct scsi_disk *sdkp = scsi_disk(disk); 1283 struct scsi_device *sdp = sdkp->device; 1284 void __user *p = (void __user *)arg; 1285 int error; 1286 1287 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, " 1288 "cmd=0x%x\n", disk->disk_name, cmd)); 1289 1290 error = scsi_verify_blk_ioctl(bdev, cmd); 1291 if (error < 0) 1292 return error; 1293 1294 /* 1295 * If we are in the middle of error recovery, don't let anyone 1296 * else try and use this device. Also, if error recovery fails, it 1297 * may try and take the device offline, in which case all further 1298 * access to the device is prohibited. 1299 */ 1300 error = scsi_nonblockable_ioctl(sdp, cmd, p, 1301 (mode & FMODE_NDELAY) != 0); 1302 if (!scsi_block_when_processing_errors(sdp) || !error) 1303 goto out; 1304 1305 /* 1306 * Send SCSI addressing ioctls directly to mid level, send other 1307 * ioctls to block level and then onto mid level if they can't be 1308 * resolved. 1309 */ 1310 switch (cmd) { 1311 case SCSI_IOCTL_GET_IDLUN: 1312 case SCSI_IOCTL_GET_BUS_NUMBER: 1313 error = scsi_ioctl(sdp, cmd, p); 1314 break; 1315 default: 1316 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p); 1317 if (error != -ENOTTY) 1318 break; 1319 error = scsi_ioctl(sdp, cmd, p); 1320 break; 1321 } 1322 out: 1323 return error; 1324 } 1325 1326 static void set_media_not_present(struct scsi_disk *sdkp) 1327 { 1328 if (sdkp->media_present) 1329 sdkp->device->changed = 1; 1330 1331 if (sdkp->device->removable) { 1332 sdkp->media_present = 0; 1333 sdkp->capacity = 0; 1334 } 1335 } 1336 1337 static int media_not_present(struct scsi_disk *sdkp, 1338 struct scsi_sense_hdr *sshdr) 1339 { 1340 if (!scsi_sense_valid(sshdr)) 1341 return 0; 1342 1343 /* not invoked for commands that could return deferred errors */ 1344 switch (sshdr->sense_key) { 1345 case UNIT_ATTENTION: 1346 case NOT_READY: 1347 /* medium not present */ 1348 if (sshdr->asc == 0x3A) { 1349 set_media_not_present(sdkp); 1350 return 1; 1351 } 1352 } 1353 return 0; 1354 } 1355 1356 /** 1357 * sd_check_events - check media events 1358 * @disk: kernel device descriptor 1359 * @clearing: disk events currently being cleared 1360 * 1361 * Returns mask of DISK_EVENT_*. 1362 * 1363 * Note: this function is invoked from the block subsystem. 1364 **/ 1365 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) 1366 { 1367 struct scsi_disk *sdkp = scsi_disk(disk); 1368 struct scsi_device *sdp = sdkp->device; 1369 struct scsi_sense_hdr *sshdr = NULL; 1370 int retval; 1371 1372 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n")); 1373 1374 /* 1375 * If the device is offline, don't send any commands - just pretend as 1376 * if the command failed. If the device ever comes back online, we 1377 * can deal with it then. It is only because of unrecoverable errors 1378 * that we would ever take a device offline in the first place. 1379 */ 1380 if (!scsi_device_online(sdp)) { 1381 set_media_not_present(sdkp); 1382 goto out; 1383 } 1384 1385 /* 1386 * Using TEST_UNIT_READY enables differentiation between drive with 1387 * no cartridge loaded - NOT READY, drive with changed cartridge - 1388 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 1389 * 1390 * Drives that auto spin down. eg iomega jaz 1G, will be started 1391 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 1392 * sd_revalidate() is called. 1393 */ 1394 retval = -ENODEV; 1395 1396 if (scsi_block_when_processing_errors(sdp)) { 1397 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 1398 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 1399 sshdr); 1400 } 1401 1402 /* failed to execute TUR, assume media not present */ 1403 if (host_byte(retval)) { 1404 set_media_not_present(sdkp); 1405 goto out; 1406 } 1407 1408 if (media_not_present(sdkp, sshdr)) 1409 goto out; 1410 1411 /* 1412 * For removable scsi disk we have to recognise the presence 1413 * of a disk in the drive. 1414 */ 1415 if (!sdkp->media_present) 1416 sdp->changed = 1; 1417 sdkp->media_present = 1; 1418 out: 1419 /* 1420 * sdp->changed is set under the following conditions: 1421 * 1422 * Medium present state has changed in either direction. 1423 * Device has indicated UNIT_ATTENTION. 1424 */ 1425 kfree(sshdr); 1426 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0; 1427 sdp->changed = 0; 1428 return retval; 1429 } 1430 1431 static int sd_sync_cache(struct scsi_disk *sdkp) 1432 { 1433 int retries, res; 1434 struct scsi_device *sdp = sdkp->device; 1435 struct scsi_sense_hdr sshdr; 1436 1437 if (!scsi_device_online(sdp)) 1438 return -ENODEV; 1439 1440 1441 for (retries = 3; retries > 0; --retries) { 1442 unsigned char cmd[10] = { 0 }; 1443 1444 cmd[0] = SYNCHRONIZE_CACHE; 1445 /* 1446 * Leave the rest of the command zero to indicate 1447 * flush everything. 1448 */ 1449 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, 1450 &sshdr, SD_FLUSH_TIMEOUT, 1451 SD_MAX_RETRIES, NULL, REQ_PM); 1452 if (res == 0) 1453 break; 1454 } 1455 1456 if (res) { 1457 sd_print_result(sdkp, res); 1458 if (driver_byte(res) & DRIVER_SENSE) 1459 sd_print_sense_hdr(sdkp, &sshdr); 1460 } 1461 1462 if (res) 1463 return -EIO; 1464 return 0; 1465 } 1466 1467 static void sd_rescan(struct device *dev) 1468 { 1469 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1470 1471 if (sdkp) { 1472 revalidate_disk(sdkp->disk); 1473 scsi_disk_put(sdkp); 1474 } 1475 } 1476 1477 1478 #ifdef CONFIG_COMPAT 1479 /* 1480 * This gets directly called from VFS. When the ioctl 1481 * is not recognized we go back to the other translation paths. 1482 */ 1483 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1484 unsigned int cmd, unsigned long arg) 1485 { 1486 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1487 int ret; 1488 1489 ret = scsi_verify_blk_ioctl(bdev, cmd); 1490 if (ret < 0) 1491 return ret; 1492 1493 /* 1494 * If we are in the middle of error recovery, don't let anyone 1495 * else try and use this device. Also, if error recovery fails, it 1496 * may try and take the device offline, in which case all further 1497 * access to the device is prohibited. 1498 */ 1499 if (!scsi_block_when_processing_errors(sdev)) 1500 return -ENODEV; 1501 1502 if (sdev->host->hostt->compat_ioctl) { 1503 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1504 1505 return ret; 1506 } 1507 1508 /* 1509 * Let the static ioctl translation table take care of it. 1510 */ 1511 return -ENOIOCTLCMD; 1512 } 1513 #endif 1514 1515 static const struct block_device_operations sd_fops = { 1516 .owner = THIS_MODULE, 1517 .open = sd_open, 1518 .release = sd_release, 1519 .ioctl = sd_ioctl, 1520 .getgeo = sd_getgeo, 1521 #ifdef CONFIG_COMPAT 1522 .compat_ioctl = sd_compat_ioctl, 1523 #endif 1524 .check_events = sd_check_events, 1525 .revalidate_disk = sd_revalidate_disk, 1526 .unlock_native_capacity = sd_unlock_native_capacity, 1527 }; 1528 1529 /** 1530 * sd_eh_action - error handling callback 1531 * @scmd: sd-issued command that has failed 1532 * @eh_cmnd: The command that was sent during error handling 1533 * @eh_cmnd_len: Length of eh_cmnd in bytes 1534 * @eh_disp: The recovery disposition suggested by the midlayer 1535 * 1536 * This function is called by the SCSI midlayer upon completion of 1537 * an error handling command (TEST UNIT READY, START STOP UNIT, 1538 * etc.) The command sent to the device by the error handler is 1539 * stored in eh_cmnd. The result of sending the eh command is 1540 * passed in eh_disp. 1541 **/ 1542 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd, 1543 int eh_cmnd_len, int eh_disp) 1544 { 1545 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); 1546 1547 if (!scsi_device_online(scmd->device) || 1548 !scsi_medium_access_command(scmd)) 1549 return eh_disp; 1550 1551 /* 1552 * The device has timed out executing a medium access command. 1553 * However, the TEST UNIT READY command sent during error 1554 * handling completed successfully. Either the device is in the 1555 * process of recovering or has it suffered an internal failure 1556 * that prevents access to the storage medium. 1557 */ 1558 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS && 1559 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY) 1560 sdkp->medium_access_timed_out++; 1561 1562 /* 1563 * If the device keeps failing read/write commands but TEST UNIT 1564 * READY always completes successfully we assume that medium 1565 * access is no longer possible and take the device offline. 1566 */ 1567 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) { 1568 scmd_printk(KERN_ERR, scmd, 1569 "Medium access timeout failure. Offlining disk!\n"); 1570 scsi_device_set_state(scmd->device, SDEV_OFFLINE); 1571 1572 return FAILED; 1573 } 1574 1575 return eh_disp; 1576 } 1577 1578 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1579 { 1580 u64 start_lba = blk_rq_pos(scmd->request); 1581 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); 1582 u64 bad_lba; 1583 int info_valid; 1584 /* 1585 * resid is optional but mostly filled in. When it's unused, 1586 * its value is zero, so we assume the whole buffer transferred 1587 */ 1588 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); 1589 unsigned int good_bytes; 1590 1591 if (scmd->request->cmd_type != REQ_TYPE_FS) 1592 return 0; 1593 1594 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 1595 SCSI_SENSE_BUFFERSIZE, 1596 &bad_lba); 1597 if (!info_valid) 1598 return 0; 1599 1600 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 1601 return 0; 1602 1603 if (scmd->device->sector_size < 512) { 1604 /* only legitimate sector_size here is 256 */ 1605 start_lba <<= 1; 1606 end_lba <<= 1; 1607 } else { 1608 /* be careful ... don't want any overflows */ 1609 u64 factor = scmd->device->sector_size / 512; 1610 do_div(start_lba, factor); 1611 do_div(end_lba, factor); 1612 } 1613 1614 /* The bad lba was reported incorrectly, we have no idea where 1615 * the error is. 1616 */ 1617 if (bad_lba < start_lba || bad_lba >= end_lba) 1618 return 0; 1619 1620 /* This computation should always be done in terms of 1621 * the resolution of the device's medium. 1622 */ 1623 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size; 1624 return min(good_bytes, transferred); 1625 } 1626 1627 /** 1628 * sd_done - bottom half handler: called when the lower level 1629 * driver has completed (successfully or otherwise) a scsi command. 1630 * @SCpnt: mid-level's per command structure. 1631 * 1632 * Note: potentially run from within an ISR. Must not block. 1633 **/ 1634 static int sd_done(struct scsi_cmnd *SCpnt) 1635 { 1636 int result = SCpnt->result; 1637 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1638 struct scsi_sense_hdr sshdr; 1639 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1640 struct request *req = SCpnt->request; 1641 int sense_valid = 0; 1642 int sense_deferred = 0; 1643 unsigned char op = SCpnt->cmnd[0]; 1644 unsigned char unmap = SCpnt->cmnd[1] & 8; 1645 1646 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) { 1647 if (!result) { 1648 good_bytes = blk_rq_bytes(req); 1649 scsi_set_resid(SCpnt, 0); 1650 } else { 1651 good_bytes = 0; 1652 scsi_set_resid(SCpnt, blk_rq_bytes(req)); 1653 } 1654 } 1655 1656 if (result) { 1657 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1658 if (sense_valid) 1659 sense_deferred = scsi_sense_is_deferred(&sshdr); 1660 } 1661 #ifdef CONFIG_SCSI_LOGGING 1662 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 1663 if (sense_valid) { 1664 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1665 "sd_done: sb[respc,sk,asc," 1666 "ascq]=%x,%x,%x,%x\n", 1667 sshdr.response_code, 1668 sshdr.sense_key, sshdr.asc, 1669 sshdr.ascq)); 1670 } 1671 #endif 1672 if (driver_byte(result) != DRIVER_SENSE && 1673 (!sense_valid || sense_deferred)) 1674 goto out; 1675 1676 sdkp->medium_access_timed_out = 0; 1677 1678 switch (sshdr.sense_key) { 1679 case HARDWARE_ERROR: 1680 case MEDIUM_ERROR: 1681 good_bytes = sd_completed_bytes(SCpnt); 1682 break; 1683 case RECOVERED_ERROR: 1684 good_bytes = scsi_bufflen(SCpnt); 1685 break; 1686 case NO_SENSE: 1687 /* This indicates a false check condition, so ignore it. An 1688 * unknown amount of data was transferred so treat it as an 1689 * error. 1690 */ 1691 scsi_print_sense("sd", SCpnt); 1692 SCpnt->result = 0; 1693 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1694 break; 1695 case ABORTED_COMMAND: 1696 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */ 1697 good_bytes = sd_completed_bytes(SCpnt); 1698 break; 1699 case ILLEGAL_REQUEST: 1700 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */ 1701 good_bytes = sd_completed_bytes(SCpnt); 1702 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */ 1703 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) { 1704 switch (op) { 1705 case UNMAP: 1706 sd_config_discard(sdkp, SD_LBP_DISABLE); 1707 break; 1708 case WRITE_SAME_16: 1709 case WRITE_SAME: 1710 if (unmap) 1711 sd_config_discard(sdkp, SD_LBP_DISABLE); 1712 else { 1713 sdkp->device->no_write_same = 1; 1714 sd_config_write_same(sdkp); 1715 1716 good_bytes = 0; 1717 req->__data_len = blk_rq_bytes(req); 1718 req->cmd_flags |= REQ_QUIET; 1719 } 1720 } 1721 } 1722 break; 1723 default: 1724 break; 1725 } 1726 out: 1727 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1728 sd_dif_complete(SCpnt, good_bytes); 1729 1730 return good_bytes; 1731 } 1732 1733 /* 1734 * spinup disk - called only in sd_revalidate_disk() 1735 */ 1736 static void 1737 sd_spinup_disk(struct scsi_disk *sdkp) 1738 { 1739 unsigned char cmd[10]; 1740 unsigned long spintime_expire = 0; 1741 int retries, spintime; 1742 unsigned int the_result; 1743 struct scsi_sense_hdr sshdr; 1744 int sense_valid = 0; 1745 1746 spintime = 0; 1747 1748 /* Spin up drives, as required. Only do this at boot time */ 1749 /* Spinup needs to be done for module loads too. */ 1750 do { 1751 retries = 0; 1752 1753 do { 1754 cmd[0] = TEST_UNIT_READY; 1755 memset((void *) &cmd[1], 0, 9); 1756 1757 the_result = scsi_execute_req(sdkp->device, cmd, 1758 DMA_NONE, NULL, 0, 1759 &sshdr, SD_TIMEOUT, 1760 SD_MAX_RETRIES, NULL); 1761 1762 /* 1763 * If the drive has indicated to us that it 1764 * doesn't have any media in it, don't bother 1765 * with any more polling. 1766 */ 1767 if (media_not_present(sdkp, &sshdr)) 1768 return; 1769 1770 if (the_result) 1771 sense_valid = scsi_sense_valid(&sshdr); 1772 retries++; 1773 } while (retries < 3 && 1774 (!scsi_status_is_good(the_result) || 1775 ((driver_byte(the_result) & DRIVER_SENSE) && 1776 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1777 1778 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1779 /* no sense, TUR either succeeded or failed 1780 * with a status error */ 1781 if(!spintime && !scsi_status_is_good(the_result)) { 1782 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1783 sd_print_result(sdkp, the_result); 1784 } 1785 break; 1786 } 1787 1788 /* 1789 * The device does not want the automatic start to be issued. 1790 */ 1791 if (sdkp->device->no_start_on_add) 1792 break; 1793 1794 if (sense_valid && sshdr.sense_key == NOT_READY) { 1795 if (sshdr.asc == 4 && sshdr.ascq == 3) 1796 break; /* manual intervention required */ 1797 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 1798 break; /* standby */ 1799 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 1800 break; /* unavailable */ 1801 /* 1802 * Issue command to spin up drive when not ready 1803 */ 1804 if (!spintime) { 1805 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1806 cmd[0] = START_STOP; 1807 cmd[1] = 1; /* Return immediately */ 1808 memset((void *) &cmd[2], 0, 8); 1809 cmd[4] = 1; /* Start spin cycle */ 1810 if (sdkp->device->start_stop_pwr_cond) 1811 cmd[4] |= 1 << 4; 1812 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1813 NULL, 0, &sshdr, 1814 SD_TIMEOUT, SD_MAX_RETRIES, 1815 NULL); 1816 spintime_expire = jiffies + 100 * HZ; 1817 spintime = 1; 1818 } 1819 /* Wait 1 second for next try */ 1820 msleep(1000); 1821 printk("."); 1822 1823 /* 1824 * Wait for USB flash devices with slow firmware. 1825 * Yes, this sense key/ASC combination shouldn't 1826 * occur here. It's characteristic of these devices. 1827 */ 1828 } else if (sense_valid && 1829 sshdr.sense_key == UNIT_ATTENTION && 1830 sshdr.asc == 0x28) { 1831 if (!spintime) { 1832 spintime_expire = jiffies + 5 * HZ; 1833 spintime = 1; 1834 } 1835 /* Wait 1 second for next try */ 1836 msleep(1000); 1837 } else { 1838 /* we don't understand the sense code, so it's 1839 * probably pointless to loop */ 1840 if(!spintime) { 1841 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1842 sd_print_sense_hdr(sdkp, &sshdr); 1843 } 1844 break; 1845 } 1846 1847 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1848 1849 if (spintime) { 1850 if (scsi_status_is_good(the_result)) 1851 printk("ready\n"); 1852 else 1853 printk("not responding...\n"); 1854 } 1855 } 1856 1857 1858 /* 1859 * Determine whether disk supports Data Integrity Field. 1860 */ 1861 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1862 { 1863 struct scsi_device *sdp = sdkp->device; 1864 u8 type; 1865 int ret = 0; 1866 1867 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1868 return ret; 1869 1870 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1871 1872 if (type > SD_DIF_TYPE3_PROTECTION) 1873 ret = -ENODEV; 1874 else if (scsi_host_dif_capable(sdp->host, type)) 1875 ret = 1; 1876 1877 if (sdkp->first_scan || type != sdkp->protection_type) 1878 switch (ret) { 1879 case -ENODEV: 1880 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \ 1881 " protection type %u. Disabling disk!\n", 1882 type); 1883 break; 1884 case 1: 1885 sd_printk(KERN_NOTICE, sdkp, 1886 "Enabling DIF Type %u protection\n", type); 1887 break; 1888 case 0: 1889 sd_printk(KERN_NOTICE, sdkp, 1890 "Disabling DIF Type %u protection\n", type); 1891 break; 1892 } 1893 1894 sdkp->protection_type = type; 1895 1896 return ret; 1897 } 1898 1899 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 1900 struct scsi_sense_hdr *sshdr, int sense_valid, 1901 int the_result) 1902 { 1903 sd_print_result(sdkp, the_result); 1904 if (driver_byte(the_result) & DRIVER_SENSE) 1905 sd_print_sense_hdr(sdkp, sshdr); 1906 else 1907 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1908 1909 /* 1910 * Set dirty bit for removable devices if not ready - 1911 * sometimes drives will not report this properly. 1912 */ 1913 if (sdp->removable && 1914 sense_valid && sshdr->sense_key == NOT_READY) 1915 set_media_not_present(sdkp); 1916 1917 /* 1918 * We used to set media_present to 0 here to indicate no media 1919 * in the drive, but some drives fail read capacity even with 1920 * media present, so we can't do that. 1921 */ 1922 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1923 } 1924 1925 #define RC16_LEN 32 1926 #if RC16_LEN > SD_BUF_SIZE 1927 #error RC16_LEN must not be more than SD_BUF_SIZE 1928 #endif 1929 1930 #define READ_CAPACITY_RETRIES_ON_RESET 10 1931 1932 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 1933 unsigned char *buffer) 1934 { 1935 unsigned char cmd[16]; 1936 struct scsi_sense_hdr sshdr; 1937 int sense_valid = 0; 1938 int the_result; 1939 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1940 unsigned int alignment; 1941 unsigned long long lba; 1942 unsigned sector_size; 1943 1944 if (sdp->no_read_capacity_16) 1945 return -EINVAL; 1946 1947 do { 1948 memset(cmd, 0, 16); 1949 cmd[0] = SERVICE_ACTION_IN; 1950 cmd[1] = SAI_READ_CAPACITY_16; 1951 cmd[13] = RC16_LEN; 1952 memset(buffer, 0, RC16_LEN); 1953 1954 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1955 buffer, RC16_LEN, &sshdr, 1956 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1957 1958 if (media_not_present(sdkp, &sshdr)) 1959 return -ENODEV; 1960 1961 if (the_result) { 1962 sense_valid = scsi_sense_valid(&sshdr); 1963 if (sense_valid && 1964 sshdr.sense_key == ILLEGAL_REQUEST && 1965 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 1966 sshdr.ascq == 0x00) 1967 /* Invalid Command Operation Code or 1968 * Invalid Field in CDB, just retry 1969 * silently with RC10 */ 1970 return -EINVAL; 1971 if (sense_valid && 1972 sshdr.sense_key == UNIT_ATTENTION && 1973 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1974 /* Device reset might occur several times, 1975 * give it one more chance */ 1976 if (--reset_retries > 0) 1977 continue; 1978 } 1979 retries--; 1980 1981 } while (the_result && retries); 1982 1983 if (the_result) { 1984 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1985 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1986 return -EINVAL; 1987 } 1988 1989 sector_size = get_unaligned_be32(&buffer[8]); 1990 lba = get_unaligned_be64(&buffer[0]); 1991 1992 if (sd_read_protection_type(sdkp, buffer) < 0) { 1993 sdkp->capacity = 0; 1994 return -ENODEV; 1995 } 1996 1997 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { 1998 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1999 "kernel compiled with support for large block " 2000 "devices.\n"); 2001 sdkp->capacity = 0; 2002 return -EOVERFLOW; 2003 } 2004 2005 /* Logical blocks per physical block exponent */ 2006 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; 2007 2008 /* Lowest aligned logical block */ 2009 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 2010 blk_queue_alignment_offset(sdp->request_queue, alignment); 2011 if (alignment && sdkp->first_scan) 2012 sd_printk(KERN_NOTICE, sdkp, 2013 "physical block alignment offset: %u\n", alignment); 2014 2015 if (buffer[14] & 0x80) { /* LBPME */ 2016 sdkp->lbpme = 1; 2017 2018 if (buffer[14] & 0x40) /* LBPRZ */ 2019 sdkp->lbprz = 1; 2020 2021 sd_config_discard(sdkp, SD_LBP_WS16); 2022 } 2023 2024 sdkp->capacity = lba + 1; 2025 return sector_size; 2026 } 2027 2028 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 2029 unsigned char *buffer) 2030 { 2031 unsigned char cmd[16]; 2032 struct scsi_sense_hdr sshdr; 2033 int sense_valid = 0; 2034 int the_result; 2035 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 2036 sector_t lba; 2037 unsigned sector_size; 2038 2039 do { 2040 cmd[0] = READ_CAPACITY; 2041 memset(&cmd[1], 0, 9); 2042 memset(buffer, 0, 8); 2043 2044 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 2045 buffer, 8, &sshdr, 2046 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2047 2048 if (media_not_present(sdkp, &sshdr)) 2049 return -ENODEV; 2050 2051 if (the_result) { 2052 sense_valid = scsi_sense_valid(&sshdr); 2053 if (sense_valid && 2054 sshdr.sense_key == UNIT_ATTENTION && 2055 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 2056 /* Device reset might occur several times, 2057 * give it one more chance */ 2058 if (--reset_retries > 0) 2059 continue; 2060 } 2061 retries--; 2062 2063 } while (the_result && retries); 2064 2065 if (the_result) { 2066 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 2067 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 2068 return -EINVAL; 2069 } 2070 2071 sector_size = get_unaligned_be32(&buffer[4]); 2072 lba = get_unaligned_be32(&buffer[0]); 2073 2074 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { 2075 /* Some buggy (usb cardreader) devices return an lba of 2076 0xffffffff when the want to report a size of 0 (with 2077 which they really mean no media is present) */ 2078 sdkp->capacity = 0; 2079 sdkp->physical_block_size = sector_size; 2080 return sector_size; 2081 } 2082 2083 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { 2084 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 2085 "kernel compiled with support for large block " 2086 "devices.\n"); 2087 sdkp->capacity = 0; 2088 return -EOVERFLOW; 2089 } 2090 2091 sdkp->capacity = lba + 1; 2092 sdkp->physical_block_size = sector_size; 2093 return sector_size; 2094 } 2095 2096 static int sd_try_rc16_first(struct scsi_device *sdp) 2097 { 2098 if (sdp->host->max_cmd_len < 16) 2099 return 0; 2100 if (sdp->try_rc_10_first) 2101 return 0; 2102 if (sdp->scsi_level > SCSI_SPC_2) 2103 return 1; 2104 if (scsi_device_protection(sdp)) 2105 return 1; 2106 return 0; 2107 } 2108 2109 /* 2110 * read disk capacity 2111 */ 2112 static void 2113 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 2114 { 2115 int sector_size; 2116 struct scsi_device *sdp = sdkp->device; 2117 sector_t old_capacity = sdkp->capacity; 2118 2119 if (sd_try_rc16_first(sdp)) { 2120 sector_size = read_capacity_16(sdkp, sdp, buffer); 2121 if (sector_size == -EOVERFLOW) 2122 goto got_data; 2123 if (sector_size == -ENODEV) 2124 return; 2125 if (sector_size < 0) 2126 sector_size = read_capacity_10(sdkp, sdp, buffer); 2127 if (sector_size < 0) 2128 return; 2129 } else { 2130 sector_size = read_capacity_10(sdkp, sdp, buffer); 2131 if (sector_size == -EOVERFLOW) 2132 goto got_data; 2133 if (sector_size < 0) 2134 return; 2135 if ((sizeof(sdkp->capacity) > 4) && 2136 (sdkp->capacity > 0xffffffffULL)) { 2137 int old_sector_size = sector_size; 2138 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 2139 "Trying to use READ CAPACITY(16).\n"); 2140 sector_size = read_capacity_16(sdkp, sdp, buffer); 2141 if (sector_size < 0) { 2142 sd_printk(KERN_NOTICE, sdkp, 2143 "Using 0xffffffff as device size\n"); 2144 sdkp->capacity = 1 + (sector_t) 0xffffffff; 2145 sector_size = old_sector_size; 2146 goto got_data; 2147 } 2148 } 2149 } 2150 2151 /* Some devices are known to return the total number of blocks, 2152 * not the highest block number. Some devices have versions 2153 * which do this and others which do not. Some devices we might 2154 * suspect of doing this but we don't know for certain. 2155 * 2156 * If we know the reported capacity is wrong, decrement it. If 2157 * we can only guess, then assume the number of blocks is even 2158 * (usually true but not always) and err on the side of lowering 2159 * the capacity. 2160 */ 2161 if (sdp->fix_capacity || 2162 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 2163 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 2164 "from its reported value: %llu\n", 2165 (unsigned long long) sdkp->capacity); 2166 --sdkp->capacity; 2167 } 2168 2169 got_data: 2170 if (sector_size == 0) { 2171 sector_size = 512; 2172 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 2173 "assuming 512.\n"); 2174 } 2175 2176 if (sector_size != 512 && 2177 sector_size != 1024 && 2178 sector_size != 2048 && 2179 sector_size != 4096 && 2180 sector_size != 256) { 2181 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 2182 sector_size); 2183 /* 2184 * The user might want to re-format the drive with 2185 * a supported sectorsize. Once this happens, it 2186 * would be relatively trivial to set the thing up. 2187 * For this reason, we leave the thing in the table. 2188 */ 2189 sdkp->capacity = 0; 2190 /* 2191 * set a bogus sector size so the normal read/write 2192 * logic in the block layer will eventually refuse any 2193 * request on this device without tripping over power 2194 * of two sector size assumptions 2195 */ 2196 sector_size = 512; 2197 } 2198 blk_queue_logical_block_size(sdp->request_queue, sector_size); 2199 2200 { 2201 char cap_str_2[10], cap_str_10[10]; 2202 u64 sz = (u64)sdkp->capacity << ilog2(sector_size); 2203 2204 string_get_size(sz, STRING_UNITS_2, cap_str_2, 2205 sizeof(cap_str_2)); 2206 string_get_size(sz, STRING_UNITS_10, cap_str_10, 2207 sizeof(cap_str_10)); 2208 2209 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 2210 sd_printk(KERN_NOTICE, sdkp, 2211 "%llu %d-byte logical blocks: (%s/%s)\n", 2212 (unsigned long long)sdkp->capacity, 2213 sector_size, cap_str_10, cap_str_2); 2214 2215 if (sdkp->physical_block_size != sector_size) 2216 sd_printk(KERN_NOTICE, sdkp, 2217 "%u-byte physical blocks\n", 2218 sdkp->physical_block_size); 2219 } 2220 } 2221 2222 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff); 2223 2224 /* Rescale capacity to 512-byte units */ 2225 if (sector_size == 4096) 2226 sdkp->capacity <<= 3; 2227 else if (sector_size == 2048) 2228 sdkp->capacity <<= 2; 2229 else if (sector_size == 1024) 2230 sdkp->capacity <<= 1; 2231 else if (sector_size == 256) 2232 sdkp->capacity >>= 1; 2233 2234 blk_queue_physical_block_size(sdp->request_queue, 2235 sdkp->physical_block_size); 2236 sdkp->device->sector_size = sector_size; 2237 } 2238 2239 /* called with buffer of length 512 */ 2240 static inline int 2241 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 2242 unsigned char *buffer, int len, struct scsi_mode_data *data, 2243 struct scsi_sense_hdr *sshdr) 2244 { 2245 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 2246 SD_TIMEOUT, SD_MAX_RETRIES, data, 2247 sshdr); 2248 } 2249 2250 /* 2251 * read write protect setting, if possible - called only in sd_revalidate_disk() 2252 * called with buffer of length SD_BUF_SIZE 2253 */ 2254 static void 2255 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 2256 { 2257 int res; 2258 struct scsi_device *sdp = sdkp->device; 2259 struct scsi_mode_data data; 2260 int old_wp = sdkp->write_prot; 2261 2262 set_disk_ro(sdkp->disk, 0); 2263 if (sdp->skip_ms_page_3f) { 2264 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 2265 return; 2266 } 2267 2268 if (sdp->use_192_bytes_for_3f) { 2269 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 2270 } else { 2271 /* 2272 * First attempt: ask for all pages (0x3F), but only 4 bytes. 2273 * We have to start carefully: some devices hang if we ask 2274 * for more than is available. 2275 */ 2276 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 2277 2278 /* 2279 * Second attempt: ask for page 0 When only page 0 is 2280 * implemented, a request for page 3F may return Sense Key 2281 * 5: Illegal Request, Sense Code 24: Invalid field in 2282 * CDB. 2283 */ 2284 if (!scsi_status_is_good(res)) 2285 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 2286 2287 /* 2288 * Third attempt: ask 255 bytes, as we did earlier. 2289 */ 2290 if (!scsi_status_is_good(res)) 2291 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 2292 &data, NULL); 2293 } 2294 2295 if (!scsi_status_is_good(res)) { 2296 sd_printk(KERN_WARNING, sdkp, 2297 "Test WP failed, assume Write Enabled\n"); 2298 } else { 2299 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 2300 set_disk_ro(sdkp->disk, sdkp->write_prot); 2301 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 2302 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 2303 sdkp->write_prot ? "on" : "off"); 2304 sd_printk(KERN_DEBUG, sdkp, 2305 "Mode Sense: %02x %02x %02x %02x\n", 2306 buffer[0], buffer[1], buffer[2], buffer[3]); 2307 } 2308 } 2309 } 2310 2311 /* 2312 * sd_read_cache_type - called only from sd_revalidate_disk() 2313 * called with buffer of length SD_BUF_SIZE 2314 */ 2315 static void 2316 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 2317 { 2318 int len = 0, res; 2319 struct scsi_device *sdp = sdkp->device; 2320 2321 int dbd; 2322 int modepage; 2323 int first_len; 2324 struct scsi_mode_data data; 2325 struct scsi_sense_hdr sshdr; 2326 int old_wce = sdkp->WCE; 2327 int old_rcd = sdkp->RCD; 2328 int old_dpofua = sdkp->DPOFUA; 2329 2330 2331 if (sdkp->cache_override) 2332 return; 2333 2334 first_len = 4; 2335 if (sdp->skip_ms_page_8) { 2336 if (sdp->type == TYPE_RBC) 2337 goto defaults; 2338 else { 2339 if (sdp->skip_ms_page_3f) 2340 goto defaults; 2341 modepage = 0x3F; 2342 if (sdp->use_192_bytes_for_3f) 2343 first_len = 192; 2344 dbd = 0; 2345 } 2346 } else if (sdp->type == TYPE_RBC) { 2347 modepage = 6; 2348 dbd = 8; 2349 } else { 2350 modepage = 8; 2351 dbd = 0; 2352 } 2353 2354 /* cautiously ask */ 2355 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len, 2356 &data, &sshdr); 2357 2358 if (!scsi_status_is_good(res)) 2359 goto bad_sense; 2360 2361 if (!data.header_length) { 2362 modepage = 6; 2363 first_len = 0; 2364 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 2365 } 2366 2367 /* that went OK, now ask for the proper length */ 2368 len = data.length; 2369 2370 /* 2371 * We're only interested in the first three bytes, actually. 2372 * But the data cache page is defined for the first 20. 2373 */ 2374 if (len < 3) 2375 goto bad_sense; 2376 else if (len > SD_BUF_SIZE) { 2377 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter " 2378 "data from %d to %d bytes\n", len, SD_BUF_SIZE); 2379 len = SD_BUF_SIZE; 2380 } 2381 if (modepage == 0x3F && sdp->use_192_bytes_for_3f) 2382 len = 192; 2383 2384 /* Get the data */ 2385 if (len > first_len) 2386 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, 2387 &data, &sshdr); 2388 2389 if (scsi_status_is_good(res)) { 2390 int offset = data.header_length + data.block_descriptor_length; 2391 2392 while (offset < len) { 2393 u8 page_code = buffer[offset] & 0x3F; 2394 u8 spf = buffer[offset] & 0x40; 2395 2396 if (page_code == 8 || page_code == 6) { 2397 /* We're interested only in the first 3 bytes. 2398 */ 2399 if (len - offset <= 2) { 2400 sd_printk(KERN_ERR, sdkp, "Incomplete " 2401 "mode parameter data\n"); 2402 goto defaults; 2403 } else { 2404 modepage = page_code; 2405 goto Page_found; 2406 } 2407 } else { 2408 /* Go to the next page */ 2409 if (spf && len - offset > 3) 2410 offset += 4 + (buffer[offset+2] << 8) + 2411 buffer[offset+3]; 2412 else if (!spf && len - offset > 1) 2413 offset += 2 + buffer[offset+1]; 2414 else { 2415 sd_printk(KERN_ERR, sdkp, "Incomplete " 2416 "mode parameter data\n"); 2417 goto defaults; 2418 } 2419 } 2420 } 2421 2422 if (modepage == 0x3F) { 2423 sd_printk(KERN_ERR, sdkp, "No Caching mode page " 2424 "present\n"); 2425 goto defaults; 2426 } else if ((buffer[offset] & 0x3f) != modepage) { 2427 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 2428 goto defaults; 2429 } 2430 Page_found: 2431 if (modepage == 8) { 2432 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 2433 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 2434 } else { 2435 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 2436 sdkp->RCD = 0; 2437 } 2438 2439 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 2440 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 2441 sd_printk(KERN_NOTICE, sdkp, 2442 "Uses READ/WRITE(6), disabling FUA\n"); 2443 sdkp->DPOFUA = 0; 2444 } 2445 2446 if (sdkp->first_scan || old_wce != sdkp->WCE || 2447 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 2448 sd_printk(KERN_NOTICE, sdkp, 2449 "Write cache: %s, read cache: %s, %s\n", 2450 sdkp->WCE ? "enabled" : "disabled", 2451 sdkp->RCD ? "disabled" : "enabled", 2452 sdkp->DPOFUA ? "supports DPO and FUA" 2453 : "doesn't support DPO or FUA"); 2454 2455 return; 2456 } 2457 2458 bad_sense: 2459 if (scsi_sense_valid(&sshdr) && 2460 sshdr.sense_key == ILLEGAL_REQUEST && 2461 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 2462 /* Invalid field in CDB */ 2463 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 2464 else 2465 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 2466 2467 defaults: 2468 if (sdp->wce_default_on) { 2469 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n"); 2470 sdkp->WCE = 1; 2471 } else { 2472 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 2473 sdkp->WCE = 0; 2474 } 2475 sdkp->RCD = 0; 2476 sdkp->DPOFUA = 0; 2477 } 2478 2479 /* 2480 * The ATO bit indicates whether the DIF application tag is available 2481 * for use by the operating system. 2482 */ 2483 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 2484 { 2485 int res, offset; 2486 struct scsi_device *sdp = sdkp->device; 2487 struct scsi_mode_data data; 2488 struct scsi_sense_hdr sshdr; 2489 2490 if (sdp->type != TYPE_DISK) 2491 return; 2492 2493 if (sdkp->protection_type == 0) 2494 return; 2495 2496 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 2497 SD_MAX_RETRIES, &data, &sshdr); 2498 2499 if (!scsi_status_is_good(res) || !data.header_length || 2500 data.length < 6) { 2501 sd_printk(KERN_WARNING, sdkp, 2502 "getting Control mode page failed, assume no ATO\n"); 2503 2504 if (scsi_sense_valid(&sshdr)) 2505 sd_print_sense_hdr(sdkp, &sshdr); 2506 2507 return; 2508 } 2509 2510 offset = data.header_length + data.block_descriptor_length; 2511 2512 if ((buffer[offset] & 0x3f) != 0x0a) { 2513 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 2514 return; 2515 } 2516 2517 if ((buffer[offset + 5] & 0x80) == 0) 2518 return; 2519 2520 sdkp->ATO = 1; 2521 2522 return; 2523 } 2524 2525 /** 2526 * sd_read_block_limits - Query disk device for preferred I/O sizes. 2527 * @disk: disk to query 2528 */ 2529 static void sd_read_block_limits(struct scsi_disk *sdkp) 2530 { 2531 unsigned int sector_sz = sdkp->device->sector_size; 2532 const int vpd_len = 64; 2533 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 2534 2535 if (!buffer || 2536 /* Block Limits VPD */ 2537 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 2538 goto out; 2539 2540 blk_queue_io_min(sdkp->disk->queue, 2541 get_unaligned_be16(&buffer[6]) * sector_sz); 2542 blk_queue_io_opt(sdkp->disk->queue, 2543 get_unaligned_be32(&buffer[12]) * sector_sz); 2544 2545 if (buffer[3] == 0x3c) { 2546 unsigned int lba_count, desc_count; 2547 2548 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]); 2549 2550 if (!sdkp->lbpme) 2551 goto out; 2552 2553 lba_count = get_unaligned_be32(&buffer[20]); 2554 desc_count = get_unaligned_be32(&buffer[24]); 2555 2556 if (lba_count && desc_count) 2557 sdkp->max_unmap_blocks = lba_count; 2558 2559 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]); 2560 2561 if (buffer[32] & 0x80) 2562 sdkp->unmap_alignment = 2563 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 2564 2565 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */ 2566 2567 if (sdkp->max_unmap_blocks) 2568 sd_config_discard(sdkp, SD_LBP_UNMAP); 2569 else 2570 sd_config_discard(sdkp, SD_LBP_WS16); 2571 2572 } else { /* LBP VPD page tells us what to use */ 2573 2574 if (sdkp->lbpu && sdkp->max_unmap_blocks) 2575 sd_config_discard(sdkp, SD_LBP_UNMAP); 2576 else if (sdkp->lbpws) 2577 sd_config_discard(sdkp, SD_LBP_WS16); 2578 else if (sdkp->lbpws10) 2579 sd_config_discard(sdkp, SD_LBP_WS10); 2580 else 2581 sd_config_discard(sdkp, SD_LBP_DISABLE); 2582 } 2583 } 2584 2585 out: 2586 kfree(buffer); 2587 } 2588 2589 /** 2590 * sd_read_block_characteristics - Query block dev. characteristics 2591 * @disk: disk to query 2592 */ 2593 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2594 { 2595 unsigned char *buffer; 2596 u16 rot; 2597 const int vpd_len = 64; 2598 2599 buffer = kmalloc(vpd_len, GFP_KERNEL); 2600 2601 if (!buffer || 2602 /* Block Device Characteristics VPD */ 2603 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2604 goto out; 2605 2606 rot = get_unaligned_be16(&buffer[4]); 2607 2608 if (rot == 1) 2609 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); 2610 2611 out: 2612 kfree(buffer); 2613 } 2614 2615 /** 2616 * sd_read_block_provisioning - Query provisioning VPD page 2617 * @disk: disk to query 2618 */ 2619 static void sd_read_block_provisioning(struct scsi_disk *sdkp) 2620 { 2621 unsigned char *buffer; 2622 const int vpd_len = 8; 2623 2624 if (sdkp->lbpme == 0) 2625 return; 2626 2627 buffer = kmalloc(vpd_len, GFP_KERNEL); 2628 2629 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len)) 2630 goto out; 2631 2632 sdkp->lbpvpd = 1; 2633 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */ 2634 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */ 2635 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */ 2636 2637 out: 2638 kfree(buffer); 2639 } 2640 2641 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer) 2642 { 2643 struct scsi_device *sdev = sdkp->device; 2644 2645 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) { 2646 sdev->no_report_opcodes = 1; 2647 2648 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION 2649 * CODES is unsupported and the device has an ATA 2650 * Information VPD page (SAT). 2651 */ 2652 if (!scsi_get_vpd_page(sdev, 0x89, buffer, SD_BUF_SIZE)) 2653 sdev->no_write_same = 1; 2654 } 2655 2656 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1) 2657 sdkp->ws16 = 1; 2658 2659 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1) 2660 sdkp->ws10 = 1; 2661 } 2662 2663 static int sd_try_extended_inquiry(struct scsi_device *sdp) 2664 { 2665 /* 2666 * Although VPD inquiries can go to SCSI-2 type devices, 2667 * some USB ones crash on receiving them, and the pages 2668 * we currently ask for are for SPC-3 and beyond 2669 */ 2670 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages) 2671 return 1; 2672 return 0; 2673 } 2674 2675 /** 2676 * sd_revalidate_disk - called the first time a new disk is seen, 2677 * performs disk spin up, read_capacity, etc. 2678 * @disk: struct gendisk we care about 2679 **/ 2680 static int sd_revalidate_disk(struct gendisk *disk) 2681 { 2682 struct scsi_disk *sdkp = scsi_disk(disk); 2683 struct scsi_device *sdp = sdkp->device; 2684 unsigned char *buffer; 2685 unsigned flush = 0; 2686 2687 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 2688 "sd_revalidate_disk\n")); 2689 2690 /* 2691 * If the device is offline, don't try and read capacity or any 2692 * of the other niceties. 2693 */ 2694 if (!scsi_device_online(sdp)) 2695 goto out; 2696 2697 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 2698 if (!buffer) { 2699 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 2700 "allocation failure.\n"); 2701 goto out; 2702 } 2703 2704 sd_spinup_disk(sdkp); 2705 2706 /* 2707 * Without media there is no reason to ask; moreover, some devices 2708 * react badly if we do. 2709 */ 2710 if (sdkp->media_present) { 2711 sd_read_capacity(sdkp, buffer); 2712 2713 if (sd_try_extended_inquiry(sdp)) { 2714 sd_read_block_provisioning(sdkp); 2715 sd_read_block_limits(sdkp); 2716 sd_read_block_characteristics(sdkp); 2717 } 2718 2719 sd_read_write_protect_flag(sdkp, buffer); 2720 sd_read_cache_type(sdkp, buffer); 2721 sd_read_app_tag_own(sdkp, buffer); 2722 sd_read_write_same(sdkp, buffer); 2723 } 2724 2725 sdkp->first_scan = 0; 2726 2727 /* 2728 * We now have all cache related info, determine how we deal 2729 * with flush requests. 2730 */ 2731 if (sdkp->WCE) { 2732 flush |= REQ_FLUSH; 2733 if (sdkp->DPOFUA) 2734 flush |= REQ_FUA; 2735 } 2736 2737 blk_queue_flush(sdkp->disk->queue, flush); 2738 2739 set_capacity(disk, sdkp->capacity); 2740 sd_config_write_same(sdkp); 2741 kfree(buffer); 2742 2743 out: 2744 return 0; 2745 } 2746 2747 /** 2748 * sd_unlock_native_capacity - unlock native capacity 2749 * @disk: struct gendisk to set capacity for 2750 * 2751 * Block layer calls this function if it detects that partitions 2752 * on @disk reach beyond the end of the device. If the SCSI host 2753 * implements ->unlock_native_capacity() method, it's invoked to 2754 * give it a chance to adjust the device capacity. 2755 * 2756 * CONTEXT: 2757 * Defined by block layer. Might sleep. 2758 */ 2759 static void sd_unlock_native_capacity(struct gendisk *disk) 2760 { 2761 struct scsi_device *sdev = scsi_disk(disk)->device; 2762 2763 if (sdev->host->hostt->unlock_native_capacity) 2764 sdev->host->hostt->unlock_native_capacity(sdev); 2765 } 2766 2767 /** 2768 * sd_format_disk_name - format disk name 2769 * @prefix: name prefix - ie. "sd" for SCSI disks 2770 * @index: index of the disk to format name for 2771 * @buf: output buffer 2772 * @buflen: length of the output buffer 2773 * 2774 * SCSI disk names starts at sda. The 26th device is sdz and the 2775 * 27th is sdaa. The last one for two lettered suffix is sdzz 2776 * which is followed by sdaaa. 2777 * 2778 * This is basically 26 base counting with one extra 'nil' entry 2779 * at the beginning from the second digit on and can be 2780 * determined using similar method as 26 base conversion with the 2781 * index shifted -1 after each digit is computed. 2782 * 2783 * CONTEXT: 2784 * Don't care. 2785 * 2786 * RETURNS: 2787 * 0 on success, -errno on failure. 2788 */ 2789 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 2790 { 2791 const int base = 'z' - 'a' + 1; 2792 char *begin = buf + strlen(prefix); 2793 char *end = buf + buflen; 2794 char *p; 2795 int unit; 2796 2797 p = end - 1; 2798 *p = '\0'; 2799 unit = base; 2800 do { 2801 if (p == begin) 2802 return -EINVAL; 2803 *--p = 'a' + (index % unit); 2804 index = (index / unit) - 1; 2805 } while (index >= 0); 2806 2807 memmove(begin, p, end - p); 2808 memcpy(buf, prefix, strlen(prefix)); 2809 2810 return 0; 2811 } 2812 2813 /* 2814 * The asynchronous part of sd_probe 2815 */ 2816 static void sd_probe_async(void *data, async_cookie_t cookie) 2817 { 2818 struct scsi_disk *sdkp = data; 2819 struct scsi_device *sdp; 2820 struct gendisk *gd; 2821 u32 index; 2822 struct device *dev; 2823 2824 sdp = sdkp->device; 2825 gd = sdkp->disk; 2826 index = sdkp->index; 2827 dev = &sdp->sdev_gendev; 2828 2829 gd->major = sd_major((index & 0xf0) >> 4); 2830 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 2831 gd->minors = SD_MINORS; 2832 2833 gd->fops = &sd_fops; 2834 gd->private_data = &sdkp->driver; 2835 gd->queue = sdkp->device->request_queue; 2836 2837 /* defaults, until the device tells us otherwise */ 2838 sdp->sector_size = 512; 2839 sdkp->capacity = 0; 2840 sdkp->media_present = 1; 2841 sdkp->write_prot = 0; 2842 sdkp->cache_override = 0; 2843 sdkp->WCE = 0; 2844 sdkp->RCD = 0; 2845 sdkp->ATO = 0; 2846 sdkp->first_scan = 1; 2847 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS; 2848 2849 sd_revalidate_disk(gd); 2850 2851 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); 2852 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn); 2853 2854 gd->driverfs_dev = &sdp->sdev_gendev; 2855 gd->flags = GENHD_FL_EXT_DEVT; 2856 if (sdp->removable) { 2857 gd->flags |= GENHD_FL_REMOVABLE; 2858 gd->events |= DISK_EVENT_MEDIA_CHANGE; 2859 } 2860 2861 add_disk(gd); 2862 if (sdkp->capacity) 2863 sd_dif_config_host(sdkp); 2864 2865 sd_revalidate_disk(gd); 2866 2867 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 2868 sdp->removable ? "removable " : ""); 2869 blk_pm_runtime_init(sdp->request_queue, dev); 2870 scsi_autopm_put_device(sdp); 2871 put_device(&sdkp->dev); 2872 } 2873 2874 /** 2875 * sd_probe - called during driver initialization and whenever a 2876 * new scsi device is attached to the system. It is called once 2877 * for each scsi device (not just disks) present. 2878 * @dev: pointer to device object 2879 * 2880 * Returns 0 if successful (or not interested in this scsi device 2881 * (e.g. scanner)); 1 when there is an error. 2882 * 2883 * Note: this function is invoked from the scsi mid-level. 2884 * This function sets up the mapping between a given 2885 * <host,channel,id,lun> (found in sdp) and new device name 2886 * (e.g. /dev/sda). More precisely it is the block device major 2887 * and minor number that is chosen here. 2888 * 2889 * Assume sd_probe is not re-entrant (for time being) 2890 * Also think about sd_probe() and sd_remove() running coincidentally. 2891 **/ 2892 static int sd_probe(struct device *dev) 2893 { 2894 struct scsi_device *sdp = to_scsi_device(dev); 2895 struct scsi_disk *sdkp; 2896 struct gendisk *gd; 2897 int index; 2898 int error; 2899 2900 error = -ENODEV; 2901 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 2902 goto out; 2903 2904 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 2905 "sd_probe\n")); 2906 2907 error = -ENOMEM; 2908 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 2909 if (!sdkp) 2910 goto out; 2911 2912 gd = alloc_disk(SD_MINORS); 2913 if (!gd) 2914 goto out_free; 2915 2916 do { 2917 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 2918 goto out_put; 2919 2920 spin_lock(&sd_index_lock); 2921 error = ida_get_new(&sd_index_ida, &index); 2922 spin_unlock(&sd_index_lock); 2923 } while (error == -EAGAIN); 2924 2925 if (error) { 2926 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n"); 2927 goto out_put; 2928 } 2929 2930 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 2931 if (error) { 2932 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n"); 2933 goto out_free_index; 2934 } 2935 2936 sdkp->device = sdp; 2937 sdkp->driver = &sd_template; 2938 sdkp->disk = gd; 2939 sdkp->index = index; 2940 atomic_set(&sdkp->openers, 0); 2941 atomic_set(&sdkp->device->ioerr_cnt, 0); 2942 2943 if (!sdp->request_queue->rq_timeout) { 2944 if (sdp->type != TYPE_MOD) 2945 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 2946 else 2947 blk_queue_rq_timeout(sdp->request_queue, 2948 SD_MOD_TIMEOUT); 2949 } 2950 2951 device_initialize(&sdkp->dev); 2952 sdkp->dev.parent = dev; 2953 sdkp->dev.class = &sd_disk_class; 2954 dev_set_name(&sdkp->dev, "%s", dev_name(dev)); 2955 2956 if (device_add(&sdkp->dev)) 2957 goto out_free_index; 2958 2959 get_device(dev); 2960 dev_set_drvdata(dev, sdkp); 2961 2962 get_device(&sdkp->dev); /* prevent release before async_schedule */ 2963 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain); 2964 2965 return 0; 2966 2967 out_free_index: 2968 spin_lock(&sd_index_lock); 2969 ida_remove(&sd_index_ida, index); 2970 spin_unlock(&sd_index_lock); 2971 out_put: 2972 put_disk(gd); 2973 out_free: 2974 kfree(sdkp); 2975 out: 2976 return error; 2977 } 2978 2979 /** 2980 * sd_remove - called whenever a scsi disk (previously recognized by 2981 * sd_probe) is detached from the system. It is called (potentially 2982 * multiple times) during sd module unload. 2983 * @sdp: pointer to mid level scsi device object 2984 * 2985 * Note: this function is invoked from the scsi mid-level. 2986 * This function potentially frees up a device name (e.g. /dev/sdc) 2987 * that could be re-used by a subsequent sd_probe(). 2988 * This function is not called when the built-in sd driver is "exit-ed". 2989 **/ 2990 static int sd_remove(struct device *dev) 2991 { 2992 struct scsi_disk *sdkp; 2993 dev_t devt; 2994 2995 sdkp = dev_get_drvdata(dev); 2996 devt = disk_devt(sdkp->disk); 2997 scsi_autopm_get_device(sdkp->device); 2998 2999 async_synchronize_full_domain(&scsi_sd_probe_domain); 3000 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); 3001 blk_queue_unprep_rq(sdkp->device->request_queue, NULL); 3002 device_del(&sdkp->dev); 3003 del_gendisk(sdkp->disk); 3004 sd_shutdown(dev); 3005 3006 blk_register_region(devt, SD_MINORS, NULL, 3007 sd_default_probe, NULL, NULL); 3008 3009 mutex_lock(&sd_ref_mutex); 3010 dev_set_drvdata(dev, NULL); 3011 put_device(&sdkp->dev); 3012 mutex_unlock(&sd_ref_mutex); 3013 3014 return 0; 3015 } 3016 3017 /** 3018 * scsi_disk_release - Called to free the scsi_disk structure 3019 * @dev: pointer to embedded class device 3020 * 3021 * sd_ref_mutex must be held entering this routine. Because it is 3022 * called on last put, you should always use the scsi_disk_get() 3023 * scsi_disk_put() helpers which manipulate the semaphore directly 3024 * and never do a direct put_device. 3025 **/ 3026 static void scsi_disk_release(struct device *dev) 3027 { 3028 struct scsi_disk *sdkp = to_scsi_disk(dev); 3029 struct gendisk *disk = sdkp->disk; 3030 3031 spin_lock(&sd_index_lock); 3032 ida_remove(&sd_index_ida, sdkp->index); 3033 spin_unlock(&sd_index_lock); 3034 3035 disk->private_data = NULL; 3036 put_disk(disk); 3037 put_device(&sdkp->device->sdev_gendev); 3038 3039 kfree(sdkp); 3040 } 3041 3042 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 3043 { 3044 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 3045 struct scsi_sense_hdr sshdr; 3046 struct scsi_device *sdp = sdkp->device; 3047 int res; 3048 3049 if (start) 3050 cmd[4] |= 1; /* START */ 3051 3052 if (sdp->start_stop_pwr_cond) 3053 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 3054 3055 if (!scsi_device_online(sdp)) 3056 return -ENODEV; 3057 3058 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 3059 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM); 3060 if (res) { 3061 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 3062 sd_print_result(sdkp, res); 3063 if (driver_byte(res) & DRIVER_SENSE) 3064 sd_print_sense_hdr(sdkp, &sshdr); 3065 } 3066 3067 return res; 3068 } 3069 3070 /* 3071 * Send a SYNCHRONIZE CACHE instruction down to the device through 3072 * the normal SCSI command structure. Wait for the command to 3073 * complete. 3074 */ 3075 static void sd_shutdown(struct device *dev) 3076 { 3077 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 3078 3079 if (!sdkp) 3080 return; /* this can happen */ 3081 3082 if (pm_runtime_suspended(dev)) 3083 goto exit; 3084 3085 if (sdkp->WCE) { 3086 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3087 sd_sync_cache(sdkp); 3088 } 3089 3090 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 3091 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3092 sd_start_stop_device(sdkp, 0); 3093 } 3094 3095 exit: 3096 scsi_disk_put(sdkp); 3097 } 3098 3099 static int sd_suspend(struct device *dev) 3100 { 3101 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 3102 int ret = 0; 3103 3104 if (!sdkp) 3105 return 0; /* this can happen */ 3106 3107 if (sdkp->WCE) { 3108 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3109 ret = sd_sync_cache(sdkp); 3110 if (ret) 3111 goto done; 3112 } 3113 3114 if (sdkp->device->manage_start_stop) { 3115 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3116 ret = sd_start_stop_device(sdkp, 0); 3117 } 3118 3119 done: 3120 scsi_disk_put(sdkp); 3121 return ret; 3122 } 3123 3124 static int sd_resume(struct device *dev) 3125 { 3126 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 3127 int ret = 0; 3128 3129 if (!sdkp->device->manage_start_stop) 3130 goto done; 3131 3132 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 3133 ret = sd_start_stop_device(sdkp, 1); 3134 3135 done: 3136 scsi_disk_put(sdkp); 3137 return ret; 3138 } 3139 3140 /** 3141 * init_sd - entry point for this driver (both when built in or when 3142 * a module). 3143 * 3144 * Note: this function registers this driver with the scsi mid-level. 3145 **/ 3146 static int __init init_sd(void) 3147 { 3148 int majors = 0, i, err; 3149 3150 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 3151 3152 for (i = 0; i < SD_MAJORS; i++) { 3153 if (register_blkdev(sd_major(i), "sd") != 0) 3154 continue; 3155 majors++; 3156 blk_register_region(sd_major(i), SD_MINORS, NULL, 3157 sd_default_probe, NULL, NULL); 3158 } 3159 3160 if (!majors) 3161 return -ENODEV; 3162 3163 err = class_register(&sd_disk_class); 3164 if (err) 3165 goto err_out; 3166 3167 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 3168 0, 0, NULL); 3169 if (!sd_cdb_cache) { 3170 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 3171 goto err_out_class; 3172 } 3173 3174 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 3175 if (!sd_cdb_pool) { 3176 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 3177 goto err_out_cache; 3178 } 3179 3180 err = scsi_register_driver(&sd_template.gendrv); 3181 if (err) 3182 goto err_out_driver; 3183 3184 return 0; 3185 3186 err_out_driver: 3187 mempool_destroy(sd_cdb_pool); 3188 3189 err_out_cache: 3190 kmem_cache_destroy(sd_cdb_cache); 3191 3192 err_out_class: 3193 class_unregister(&sd_disk_class); 3194 err_out: 3195 for (i = 0; i < SD_MAJORS; i++) 3196 unregister_blkdev(sd_major(i), "sd"); 3197 return err; 3198 } 3199 3200 /** 3201 * exit_sd - exit point for this driver (when it is a module). 3202 * 3203 * Note: this function unregisters this driver from the scsi mid-level. 3204 **/ 3205 static void __exit exit_sd(void) 3206 { 3207 int i; 3208 3209 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 3210 3211 scsi_unregister_driver(&sd_template.gendrv); 3212 mempool_destroy(sd_cdb_pool); 3213 kmem_cache_destroy(sd_cdb_cache); 3214 3215 class_unregister(&sd_disk_class); 3216 3217 for (i = 0; i < SD_MAJORS; i++) { 3218 blk_unregister_region(sd_major(i), SD_MINORS); 3219 unregister_blkdev(sd_major(i), "sd"); 3220 } 3221 } 3222 3223 module_init(init_sd); 3224 module_exit(exit_sd); 3225 3226 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 3227 struct scsi_sense_hdr *sshdr) 3228 { 3229 sd_printk(KERN_INFO, sdkp, " "); 3230 scsi_show_sense_hdr(sshdr); 3231 sd_printk(KERN_INFO, sdkp, " "); 3232 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 3233 } 3234 3235 static void sd_print_result(struct scsi_disk *sdkp, int result) 3236 { 3237 sd_printk(KERN_INFO, sdkp, " "); 3238 scsi_show_result(result); 3239 } 3240 3241