1 /* 2 * sd.c Copyright (C) 1992 Drew Eckhardt 3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 4 * 5 * Linux scsi disk driver 6 * Initial versions: Drew Eckhardt 7 * Subsequent revisions: Eric Youngdale 8 * Modification history: 9 * - Drew Eckhardt <drew@colorado.edu> original 10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 11 * outstanding request, and other enhancements. 12 * Support loadable low-level scsi drivers. 13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 14 * eight major numbers. 15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs. 16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 17 * sd_init and cleanups. 18 * - Alex Davis <letmein@erols.com> Fix problem where partition info 19 * not being read in sd_open. Fix problem where removable media 20 * could be ejected after sd_open. 21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x 22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 24 * Support 32k/1M disks. 25 * 26 * Logging policy (needs CONFIG_SCSI_LOGGING defined): 27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2 28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1 29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1 30 * - entering other commands: SCSI_LOG_HLQUEUE level 3 31 * Note: when the logging level is set by the user, it must be greater 32 * than the level indicated above to trigger output. 33 */ 34 35 #include <linux/module.h> 36 #include <linux/fs.h> 37 #include <linux/kernel.h> 38 #include <linux/mm.h> 39 #include <linux/bio.h> 40 #include <linux/genhd.h> 41 #include <linux/hdreg.h> 42 #include <linux/errno.h> 43 #include <linux/idr.h> 44 #include <linux/interrupt.h> 45 #include <linux/init.h> 46 #include <linux/blkdev.h> 47 #include <linux/blkpg.h> 48 #include <linux/delay.h> 49 #include <linux/mutex.h> 50 #include <linux/string_helpers.h> 51 #include <linux/async.h> 52 #include <linux/slab.h> 53 #include <asm/uaccess.h> 54 #include <asm/unaligned.h> 55 56 #include <scsi/scsi.h> 57 #include <scsi/scsi_cmnd.h> 58 #include <scsi/scsi_dbg.h> 59 #include <scsi/scsi_device.h> 60 #include <scsi/scsi_driver.h> 61 #include <scsi/scsi_eh.h> 62 #include <scsi/scsi_host.h> 63 #include <scsi/scsi_ioctl.h> 64 #include <scsi/scsicam.h> 65 66 #include "sd.h" 67 #include "scsi_logging.h" 68 69 MODULE_AUTHOR("Eric Youngdale"); 70 MODULE_DESCRIPTION("SCSI disk (sd) driver"); 71 MODULE_LICENSE("GPL"); 72 73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 89 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 90 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 91 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 92 93 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) 94 #define SD_MINORS 16 95 #else 96 #define SD_MINORS 0 97 #endif 98 99 static int sd_revalidate_disk(struct gendisk *); 100 static void sd_unlock_native_capacity(struct gendisk *disk); 101 static int sd_probe(struct device *); 102 static int sd_remove(struct device *); 103 static void sd_shutdown(struct device *); 104 static int sd_suspend(struct device *, pm_message_t state); 105 static int sd_resume(struct device *); 106 static void sd_rescan(struct device *); 107 static int sd_done(struct scsi_cmnd *); 108 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); 109 static void scsi_disk_release(struct device *cdev); 110 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); 111 static void sd_print_result(struct scsi_disk *, int); 112 113 static DEFINE_SPINLOCK(sd_index_lock); 114 static DEFINE_IDA(sd_index_ida); 115 116 /* This semaphore is used to mediate the 0->1 reference get in the 117 * face of object destruction (i.e. we can't allow a get on an 118 * object after last put) */ 119 static DEFINE_MUTEX(sd_ref_mutex); 120 121 struct kmem_cache *sd_cdb_cache; 122 mempool_t *sd_cdb_pool; 123 124 static const char *sd_cache_types[] = { 125 "write through", "none", "write back", 126 "write back, no read (daft)" 127 }; 128 129 static ssize_t 130 sd_store_cache_type(struct device *dev, struct device_attribute *attr, 131 const char *buf, size_t count) 132 { 133 int i, ct = -1, rcd, wce, sp; 134 struct scsi_disk *sdkp = to_scsi_disk(dev); 135 struct scsi_device *sdp = sdkp->device; 136 char buffer[64]; 137 char *buffer_data; 138 struct scsi_mode_data data; 139 struct scsi_sense_hdr sshdr; 140 int len; 141 142 if (sdp->type != TYPE_DISK) 143 /* no cache control on RBC devices; theoretically they 144 * can do it, but there's probably so many exceptions 145 * it's not worth the risk */ 146 return -EINVAL; 147 148 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 149 const int len = strlen(sd_cache_types[i]); 150 if (strncmp(sd_cache_types[i], buf, len) == 0 && 151 buf[len] == '\n') { 152 ct = i; 153 break; 154 } 155 } 156 if (ct < 0) 157 return -EINVAL; 158 rcd = ct & 0x01 ? 1 : 0; 159 wce = ct & 0x02 ? 1 : 0; 160 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 161 SD_MAX_RETRIES, &data, NULL)) 162 return -EINVAL; 163 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 164 data.block_descriptor_length); 165 buffer_data = buffer + data.header_length + 166 data.block_descriptor_length; 167 buffer_data[2] &= ~0x05; 168 buffer_data[2] |= wce << 2 | rcd; 169 sp = buffer_data[0] & 0x80 ? 1 : 0; 170 171 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 172 SD_MAX_RETRIES, &data, &sshdr)) { 173 if (scsi_sense_valid(&sshdr)) 174 sd_print_sense_hdr(sdkp, &sshdr); 175 return -EINVAL; 176 } 177 revalidate_disk(sdkp->disk); 178 return count; 179 } 180 181 static ssize_t 182 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, 183 const char *buf, size_t count) 184 { 185 struct scsi_disk *sdkp = to_scsi_disk(dev); 186 struct scsi_device *sdp = sdkp->device; 187 188 if (!capable(CAP_SYS_ADMIN)) 189 return -EACCES; 190 191 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 192 193 return count; 194 } 195 196 static ssize_t 197 sd_store_allow_restart(struct device *dev, struct device_attribute *attr, 198 const char *buf, size_t count) 199 { 200 struct scsi_disk *sdkp = to_scsi_disk(dev); 201 struct scsi_device *sdp = sdkp->device; 202 203 if (!capable(CAP_SYS_ADMIN)) 204 return -EACCES; 205 206 if (sdp->type != TYPE_DISK) 207 return -EINVAL; 208 209 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 210 211 return count; 212 } 213 214 static ssize_t 215 sd_show_cache_type(struct device *dev, struct device_attribute *attr, 216 char *buf) 217 { 218 struct scsi_disk *sdkp = to_scsi_disk(dev); 219 int ct = sdkp->RCD + 2*sdkp->WCE; 220 221 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); 222 } 223 224 static ssize_t 225 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) 226 { 227 struct scsi_disk *sdkp = to_scsi_disk(dev); 228 229 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); 230 } 231 232 static ssize_t 233 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, 234 char *buf) 235 { 236 struct scsi_disk *sdkp = to_scsi_disk(dev); 237 struct scsi_device *sdp = sdkp->device; 238 239 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); 240 } 241 242 static ssize_t 243 sd_show_allow_restart(struct device *dev, struct device_attribute *attr, 244 char *buf) 245 { 246 struct scsi_disk *sdkp = to_scsi_disk(dev); 247 248 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); 249 } 250 251 static ssize_t 252 sd_show_protection_type(struct device *dev, struct device_attribute *attr, 253 char *buf) 254 { 255 struct scsi_disk *sdkp = to_scsi_disk(dev); 256 257 return snprintf(buf, 20, "%u\n", sdkp->protection_type); 258 } 259 260 static ssize_t 261 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, 262 char *buf) 263 { 264 struct scsi_disk *sdkp = to_scsi_disk(dev); 265 266 return snprintf(buf, 20, "%u\n", sdkp->ATO); 267 } 268 269 static ssize_t 270 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr, 271 char *buf) 272 { 273 struct scsi_disk *sdkp = to_scsi_disk(dev); 274 275 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning); 276 } 277 278 static struct device_attribute sd_disk_attrs[] = { 279 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, 280 sd_store_cache_type), 281 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), 282 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, 283 sd_store_allow_restart), 284 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, 285 sd_store_manage_start_stop), 286 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), 287 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), 288 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL), 289 __ATTR_NULL, 290 }; 291 292 static struct class sd_disk_class = { 293 .name = "scsi_disk", 294 .owner = THIS_MODULE, 295 .dev_release = scsi_disk_release, 296 .dev_attrs = sd_disk_attrs, 297 }; 298 299 static struct scsi_driver sd_template = { 300 .owner = THIS_MODULE, 301 .gendrv = { 302 .name = "sd", 303 .probe = sd_probe, 304 .remove = sd_remove, 305 .suspend = sd_suspend, 306 .resume = sd_resume, 307 .shutdown = sd_shutdown, 308 }, 309 .rescan = sd_rescan, 310 .done = sd_done, 311 }; 312 313 /* 314 * Device no to disk mapping: 315 * 316 * major disc2 disc p1 317 * |............|.............|....|....| <- dev_t 318 * 31 20 19 8 7 4 3 0 319 * 320 * Inside a major, we have 16k disks, however mapped non- 321 * contiguously. The first 16 disks are for major0, the next 322 * ones with major1, ... Disk 256 is for major0 again, disk 272 323 * for major1, ... 324 * As we stay compatible with our numbering scheme, we can reuse 325 * the well-know SCSI majors 8, 65--71, 136--143. 326 */ 327 static int sd_major(int major_idx) 328 { 329 switch (major_idx) { 330 case 0: 331 return SCSI_DISK0_MAJOR; 332 case 1 ... 7: 333 return SCSI_DISK1_MAJOR + major_idx - 1; 334 case 8 ... 15: 335 return SCSI_DISK8_MAJOR + major_idx - 8; 336 default: 337 BUG(); 338 return 0; /* shut up gcc */ 339 } 340 } 341 342 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) 343 { 344 struct scsi_disk *sdkp = NULL; 345 346 if (disk->private_data) { 347 sdkp = scsi_disk(disk); 348 if (scsi_device_get(sdkp->device) == 0) 349 get_device(&sdkp->dev); 350 else 351 sdkp = NULL; 352 } 353 return sdkp; 354 } 355 356 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 357 { 358 struct scsi_disk *sdkp; 359 360 mutex_lock(&sd_ref_mutex); 361 sdkp = __scsi_disk_get(disk); 362 mutex_unlock(&sd_ref_mutex); 363 return sdkp; 364 } 365 366 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) 367 { 368 struct scsi_disk *sdkp; 369 370 mutex_lock(&sd_ref_mutex); 371 sdkp = dev_get_drvdata(dev); 372 if (sdkp) 373 sdkp = __scsi_disk_get(sdkp->disk); 374 mutex_unlock(&sd_ref_mutex); 375 return sdkp; 376 } 377 378 static void scsi_disk_put(struct scsi_disk *sdkp) 379 { 380 struct scsi_device *sdev = sdkp->device; 381 382 mutex_lock(&sd_ref_mutex); 383 put_device(&sdkp->dev); 384 scsi_device_put(sdev); 385 mutex_unlock(&sd_ref_mutex); 386 } 387 388 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif) 389 { 390 unsigned int prot_op = SCSI_PROT_NORMAL; 391 unsigned int dix = scsi_prot_sg_count(scmd); 392 393 if (scmd->sc_data_direction == DMA_FROM_DEVICE) { 394 if (dif && dix) 395 prot_op = SCSI_PROT_READ_PASS; 396 else if (dif && !dix) 397 prot_op = SCSI_PROT_READ_STRIP; 398 else if (!dif && dix) 399 prot_op = SCSI_PROT_READ_INSERT; 400 } else { 401 if (dif && dix) 402 prot_op = SCSI_PROT_WRITE_PASS; 403 else if (dif && !dix) 404 prot_op = SCSI_PROT_WRITE_INSERT; 405 else if (!dif && dix) 406 prot_op = SCSI_PROT_WRITE_STRIP; 407 } 408 409 scsi_set_prot_op(scmd, prot_op); 410 scsi_set_prot_type(scmd, dif); 411 } 412 413 /** 414 * sd_prepare_discard - unmap blocks on thinly provisioned device 415 * @rq: Request to prepare 416 * 417 * Will issue either UNMAP or WRITE SAME(16) depending on preference 418 * indicated by target device. 419 **/ 420 static int sd_prepare_discard(struct request *rq) 421 { 422 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 423 struct bio *bio = rq->bio; 424 sector_t sector = bio->bi_sector; 425 unsigned int num = bio_sectors(bio); 426 427 if (sdkp->device->sector_size == 4096) { 428 sector >>= 3; 429 num >>= 3; 430 } 431 432 rq->cmd_type = REQ_TYPE_BLOCK_PC; 433 rq->timeout = SD_TIMEOUT; 434 435 memset(rq->cmd, 0, rq->cmd_len); 436 437 if (sdkp->unmap) { 438 char *buf = kmap_atomic(bio_page(bio), KM_USER0); 439 440 rq->cmd[0] = UNMAP; 441 rq->cmd[8] = 24; 442 rq->cmd_len = 10; 443 444 /* Ensure that data length matches payload */ 445 rq->__data_len = bio->bi_size = bio->bi_io_vec->bv_len = 24; 446 447 put_unaligned_be16(6 + 16, &buf[0]); 448 put_unaligned_be16(16, &buf[2]); 449 put_unaligned_be64(sector, &buf[8]); 450 put_unaligned_be32(num, &buf[16]); 451 452 kunmap_atomic(buf, KM_USER0); 453 } else { 454 rq->cmd[0] = WRITE_SAME_16; 455 rq->cmd[1] = 0x8; /* UNMAP */ 456 put_unaligned_be64(sector, &rq->cmd[2]); 457 put_unaligned_be32(num, &rq->cmd[10]); 458 rq->cmd_len = 16; 459 } 460 461 return BLKPREP_OK; 462 } 463 464 /** 465 * sd_init_command - build a scsi (read or write) command from 466 * information in the request structure. 467 * @SCpnt: pointer to mid-level's per scsi command structure that 468 * contains request and into which the scsi command is written 469 * 470 * Returns 1 if successful and 0 if error (or cannot be done now). 471 **/ 472 static int sd_prep_fn(struct request_queue *q, struct request *rq) 473 { 474 struct scsi_cmnd *SCpnt; 475 struct scsi_device *sdp = q->queuedata; 476 struct gendisk *disk = rq->rq_disk; 477 struct scsi_disk *sdkp; 478 sector_t block = blk_rq_pos(rq); 479 sector_t threshold; 480 unsigned int this_count = blk_rq_sectors(rq); 481 int ret, host_dif; 482 unsigned char protect; 483 484 /* 485 * Discard request come in as REQ_TYPE_FS but we turn them into 486 * block PC requests to make life easier. 487 */ 488 if (blk_discard_rq(rq)) 489 ret = sd_prepare_discard(rq); 490 491 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 492 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 493 goto out; 494 } else if (rq->cmd_type != REQ_TYPE_FS) { 495 ret = BLKPREP_KILL; 496 goto out; 497 } 498 ret = scsi_setup_fs_cmnd(sdp, rq); 499 if (ret != BLKPREP_OK) 500 goto out; 501 SCpnt = rq->special; 502 sdkp = scsi_disk(disk); 503 504 /* from here on until we're complete, any goto out 505 * is used for a killable error condition */ 506 ret = BLKPREP_KILL; 507 508 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 509 "sd_init_command: block=%llu, " 510 "count=%d\n", 511 (unsigned long long)block, 512 this_count)); 513 514 if (!sdp || !scsi_device_online(sdp) || 515 block + blk_rq_sectors(rq) > get_capacity(disk)) { 516 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 517 "Finishing %u sectors\n", 518 blk_rq_sectors(rq))); 519 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 520 "Retry with 0x%p\n", SCpnt)); 521 goto out; 522 } 523 524 if (sdp->changed) { 525 /* 526 * quietly refuse to do anything to a changed disc until 527 * the changed bit has been reset 528 */ 529 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ 530 goto out; 531 } 532 533 /* 534 * Some SD card readers can't handle multi-sector accesses which touch 535 * the last one or two hardware sectors. Split accesses as needed. 536 */ 537 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 538 (sdp->sector_size / 512); 539 540 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 541 if (block < threshold) { 542 /* Access up to the threshold but not beyond */ 543 this_count = threshold - block; 544 } else { 545 /* Access only a single hardware sector */ 546 this_count = sdp->sector_size / 512; 547 } 548 } 549 550 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 551 (unsigned long long)block)); 552 553 /* 554 * If we have a 1K hardware sectorsize, prevent access to single 555 * 512 byte sectors. In theory we could handle this - in fact 556 * the scsi cdrom driver must be able to handle this because 557 * we typically use 1K blocksizes, and cdroms typically have 558 * 2K hardware sectorsizes. Of course, things are simpler 559 * with the cdrom, since it is read-only. For performance 560 * reasons, the filesystems should be able to handle this 561 * and not force the scsi disk driver to use bounce buffers 562 * for this. 563 */ 564 if (sdp->sector_size == 1024) { 565 if ((block & 1) || (blk_rq_sectors(rq) & 1)) { 566 scmd_printk(KERN_ERR, SCpnt, 567 "Bad block number requested\n"); 568 goto out; 569 } else { 570 block = block >> 1; 571 this_count = this_count >> 1; 572 } 573 } 574 if (sdp->sector_size == 2048) { 575 if ((block & 3) || (blk_rq_sectors(rq) & 3)) { 576 scmd_printk(KERN_ERR, SCpnt, 577 "Bad block number requested\n"); 578 goto out; 579 } else { 580 block = block >> 2; 581 this_count = this_count >> 2; 582 } 583 } 584 if (sdp->sector_size == 4096) { 585 if ((block & 7) || (blk_rq_sectors(rq) & 7)) { 586 scmd_printk(KERN_ERR, SCpnt, 587 "Bad block number requested\n"); 588 goto out; 589 } else { 590 block = block >> 3; 591 this_count = this_count >> 3; 592 } 593 } 594 if (rq_data_dir(rq) == WRITE) { 595 if (!sdp->writeable) { 596 goto out; 597 } 598 SCpnt->cmnd[0] = WRITE_6; 599 SCpnt->sc_data_direction = DMA_TO_DEVICE; 600 601 if (blk_integrity_rq(rq) && 602 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO) 603 goto out; 604 605 } else if (rq_data_dir(rq) == READ) { 606 SCpnt->cmnd[0] = READ_6; 607 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 608 } else { 609 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); 610 goto out; 611 } 612 613 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 614 "%s %d/%u 512 byte blocks.\n", 615 (rq_data_dir(rq) == WRITE) ? 616 "writing" : "reading", this_count, 617 blk_rq_sectors(rq))); 618 619 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ 620 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 621 if (host_dif) 622 protect = 1 << 5; 623 else 624 protect = 0; 625 626 if (host_dif == SD_DIF_TYPE2_PROTECTION) { 627 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); 628 629 if (unlikely(SCpnt->cmnd == NULL)) { 630 ret = BLKPREP_DEFER; 631 goto out; 632 } 633 634 SCpnt->cmd_len = SD_EXT_CDB_SIZE; 635 memset(SCpnt->cmnd, 0, SCpnt->cmd_len); 636 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; 637 SCpnt->cmnd[7] = 0x18; 638 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; 639 SCpnt->cmnd[10] = protect | (blk_fua_rq(rq) ? 0x8 : 0); 640 641 /* LBA */ 642 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 643 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 644 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 645 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 646 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; 647 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; 648 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; 649 SCpnt->cmnd[19] = (unsigned char) block & 0xff; 650 651 /* Expected Indirect LBA */ 652 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; 653 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; 654 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; 655 SCpnt->cmnd[23] = (unsigned char) block & 0xff; 656 657 /* Transfer length */ 658 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; 659 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; 660 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; 661 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; 662 } else if (block > 0xffffffff) { 663 SCpnt->cmnd[0] += READ_16 - READ_6; 664 SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0); 665 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 666 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 667 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 668 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 669 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 670 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 671 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 672 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 673 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 674 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 675 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 676 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 677 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 678 } else if ((this_count > 0xff) || (block > 0x1fffff) || 679 scsi_device_protection(SCpnt->device) || 680 SCpnt->device->use_10_for_rw) { 681 if (this_count > 0xffff) 682 this_count = 0xffff; 683 684 SCpnt->cmnd[0] += READ_10 - READ_6; 685 SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0); 686 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 687 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 688 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 689 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 690 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 691 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 692 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 693 } else { 694 if (unlikely(blk_fua_rq(rq))) { 695 /* 696 * This happens only if this drive failed 697 * 10byte rw command with ILLEGAL_REQUEST 698 * during operation and thus turned off 699 * use_10_for_rw. 700 */ 701 scmd_printk(KERN_ERR, SCpnt, 702 "FUA write on READ/WRITE(6) drive\n"); 703 goto out; 704 } 705 706 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 707 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 708 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 709 SCpnt->cmnd[4] = (unsigned char) this_count; 710 SCpnt->cmnd[5] = 0; 711 } 712 SCpnt->sdb.length = this_count * sdp->sector_size; 713 714 /* If DIF or DIX is enabled, tell HBA how to handle request */ 715 if (host_dif || scsi_prot_sg_count(SCpnt)) 716 sd_prot_op(SCpnt, host_dif); 717 718 /* 719 * We shouldn't disconnect in the middle of a sector, so with a dumb 720 * host adapter, it's safe to assume that we can at least transfer 721 * this many bytes between each connect / disconnect. 722 */ 723 SCpnt->transfersize = sdp->sector_size; 724 SCpnt->underflow = this_count << 9; 725 SCpnt->allowed = SD_MAX_RETRIES; 726 727 /* 728 * This indicates that the command is ready from our end to be 729 * queued. 730 */ 731 ret = BLKPREP_OK; 732 out: 733 return scsi_prep_return(q, rq, ret); 734 } 735 736 /** 737 * sd_open - open a scsi disk device 738 * @inode: only i_rdev member may be used 739 * @filp: only f_mode and f_flags may be used 740 * 741 * Returns 0 if successful. Returns a negated errno value in case 742 * of error. 743 * 744 * Note: This can be called from a user context (e.g. fsck(1) ) 745 * or from within the kernel (e.g. as a result of a mount(1) ). 746 * In the latter case @inode and @filp carry an abridged amount 747 * of information as noted above. 748 **/ 749 static int sd_open(struct block_device *bdev, fmode_t mode) 750 { 751 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 752 struct scsi_device *sdev; 753 int retval; 754 755 if (!sdkp) 756 return -ENXIO; 757 758 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 759 760 sdev = sdkp->device; 761 762 /* 763 * If the device is in error recovery, wait until it is done. 764 * If the device is offline, then disallow any access to it. 765 */ 766 retval = -ENXIO; 767 if (!scsi_block_when_processing_errors(sdev)) 768 goto error_out; 769 770 if (sdev->removable || sdkp->write_prot) 771 check_disk_change(bdev); 772 773 /* 774 * If the drive is empty, just let the open fail. 775 */ 776 retval = -ENOMEDIUM; 777 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 778 goto error_out; 779 780 /* 781 * If the device has the write protect tab set, have the open fail 782 * if the user expects to be able to write to the thing. 783 */ 784 retval = -EROFS; 785 if (sdkp->write_prot && (mode & FMODE_WRITE)) 786 goto error_out; 787 788 /* 789 * It is possible that the disk changing stuff resulted in 790 * the device being taken offline. If this is the case, 791 * report this to the user, and don't pretend that the 792 * open actually succeeded. 793 */ 794 retval = -ENXIO; 795 if (!scsi_device_online(sdev)) 796 goto error_out; 797 798 if (!sdkp->openers++ && sdev->removable) { 799 if (scsi_block_when_processing_errors(sdev)) 800 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 801 } 802 803 return 0; 804 805 error_out: 806 scsi_disk_put(sdkp); 807 return retval; 808 } 809 810 /** 811 * sd_release - invoked when the (last) close(2) is called on this 812 * scsi disk. 813 * @inode: only i_rdev member may be used 814 * @filp: only f_mode and f_flags may be used 815 * 816 * Returns 0. 817 * 818 * Note: may block (uninterruptible) if error recovery is underway 819 * on this disk. 820 **/ 821 static int sd_release(struct gendisk *disk, fmode_t mode) 822 { 823 struct scsi_disk *sdkp = scsi_disk(disk); 824 struct scsi_device *sdev = sdkp->device; 825 826 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 827 828 if (!--sdkp->openers && sdev->removable) { 829 if (scsi_block_when_processing_errors(sdev)) 830 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 831 } 832 833 /* 834 * XXX and what if there are packets in flight and this close() 835 * XXX is followed by a "rmmod sd_mod"? 836 */ 837 scsi_disk_put(sdkp); 838 return 0; 839 } 840 841 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 842 { 843 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 844 struct scsi_device *sdp = sdkp->device; 845 struct Scsi_Host *host = sdp->host; 846 int diskinfo[4]; 847 848 /* default to most commonly used values */ 849 diskinfo[0] = 0x40; /* 1 << 6 */ 850 diskinfo[1] = 0x20; /* 1 << 5 */ 851 diskinfo[2] = sdkp->capacity >> 11; 852 853 /* override with calculated, extended default, or driver values */ 854 if (host->hostt->bios_param) 855 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 856 else 857 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 858 859 geo->heads = diskinfo[0]; 860 geo->sectors = diskinfo[1]; 861 geo->cylinders = diskinfo[2]; 862 return 0; 863 } 864 865 /** 866 * sd_ioctl - process an ioctl 867 * @inode: only i_rdev/i_bdev members may be used 868 * @filp: only f_mode and f_flags may be used 869 * @cmd: ioctl command number 870 * @arg: this is third argument given to ioctl(2) system call. 871 * Often contains a pointer. 872 * 873 * Returns 0 if successful (some ioctls return postive numbers on 874 * success as well). Returns a negated errno value in case of error. 875 * 876 * Note: most ioctls are forward onto the block subsystem or further 877 * down in the scsi subsystem. 878 **/ 879 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 880 unsigned int cmd, unsigned long arg) 881 { 882 struct gendisk *disk = bdev->bd_disk; 883 struct scsi_device *sdp = scsi_disk(disk)->device; 884 void __user *p = (void __user *)arg; 885 int error; 886 887 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", 888 disk->disk_name, cmd)); 889 890 /* 891 * If we are in the middle of error recovery, don't let anyone 892 * else try and use this device. Also, if error recovery fails, it 893 * may try and take the device offline, in which case all further 894 * access to the device is prohibited. 895 */ 896 error = scsi_nonblockable_ioctl(sdp, cmd, p, 897 (mode & FMODE_NDELAY) != 0); 898 if (!scsi_block_when_processing_errors(sdp) || !error) 899 return error; 900 901 /* 902 * Send SCSI addressing ioctls directly to mid level, send other 903 * ioctls to block level and then onto mid level if they can't be 904 * resolved. 905 */ 906 switch (cmd) { 907 case SCSI_IOCTL_GET_IDLUN: 908 case SCSI_IOCTL_GET_BUS_NUMBER: 909 return scsi_ioctl(sdp, cmd, p); 910 default: 911 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p); 912 if (error != -ENOTTY) 913 return error; 914 } 915 return scsi_ioctl(sdp, cmd, p); 916 } 917 918 static void set_media_not_present(struct scsi_disk *sdkp) 919 { 920 sdkp->media_present = 0; 921 sdkp->capacity = 0; 922 sdkp->device->changed = 1; 923 } 924 925 /** 926 * sd_media_changed - check if our medium changed 927 * @disk: kernel device descriptor 928 * 929 * Returns 0 if not applicable or no change; 1 if change 930 * 931 * Note: this function is invoked from the block subsystem. 932 **/ 933 static int sd_media_changed(struct gendisk *disk) 934 { 935 struct scsi_disk *sdkp = scsi_disk(disk); 936 struct scsi_device *sdp = sdkp->device; 937 struct scsi_sense_hdr *sshdr = NULL; 938 int retval; 939 940 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); 941 942 if (!sdp->removable) 943 return 0; 944 945 /* 946 * If the device is offline, don't send any commands - just pretend as 947 * if the command failed. If the device ever comes back online, we 948 * can deal with it then. It is only because of unrecoverable errors 949 * that we would ever take a device offline in the first place. 950 */ 951 if (!scsi_device_online(sdp)) { 952 set_media_not_present(sdkp); 953 retval = 1; 954 goto out; 955 } 956 957 /* 958 * Using TEST_UNIT_READY enables differentiation between drive with 959 * no cartridge loaded - NOT READY, drive with changed cartridge - 960 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 961 * 962 * Drives that auto spin down. eg iomega jaz 1G, will be started 963 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 964 * sd_revalidate() is called. 965 */ 966 retval = -ENODEV; 967 968 if (scsi_block_when_processing_errors(sdp)) { 969 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 970 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 971 sshdr); 972 } 973 974 /* 975 * Unable to test, unit probably not ready. This usually 976 * means there is no disc in the drive. Mark as changed, 977 * and we will figure it out later once the drive is 978 * available again. 979 */ 980 if (retval || (scsi_sense_valid(sshdr) && 981 /* 0x3a is medium not present */ 982 sshdr->asc == 0x3a)) { 983 set_media_not_present(sdkp); 984 retval = 1; 985 goto out; 986 } 987 988 /* 989 * For removable scsi disk we have to recognise the presence 990 * of a disk in the drive. This is kept in the struct scsi_disk 991 * struct and tested at open ! Daniel Roche (dan@lectra.fr) 992 */ 993 sdkp->media_present = 1; 994 995 retval = sdp->changed; 996 sdp->changed = 0; 997 out: 998 if (retval != sdkp->previous_state) 999 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL); 1000 sdkp->previous_state = retval; 1001 kfree(sshdr); 1002 return retval; 1003 } 1004 1005 static int sd_sync_cache(struct scsi_disk *sdkp) 1006 { 1007 int retries, res; 1008 struct scsi_device *sdp = sdkp->device; 1009 struct scsi_sense_hdr sshdr; 1010 1011 if (!scsi_device_online(sdp)) 1012 return -ENODEV; 1013 1014 1015 for (retries = 3; retries > 0; --retries) { 1016 unsigned char cmd[10] = { 0 }; 1017 1018 cmd[0] = SYNCHRONIZE_CACHE; 1019 /* 1020 * Leave the rest of the command zero to indicate 1021 * flush everything. 1022 */ 1023 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 1024 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1025 if (res == 0) 1026 break; 1027 } 1028 1029 if (res) { 1030 sd_print_result(sdkp, res); 1031 if (driver_byte(res) & DRIVER_SENSE) 1032 sd_print_sense_hdr(sdkp, &sshdr); 1033 } 1034 1035 if (res) 1036 return -EIO; 1037 return 0; 1038 } 1039 1040 static void sd_prepare_flush(struct request_queue *q, struct request *rq) 1041 { 1042 rq->cmd_type = REQ_TYPE_BLOCK_PC; 1043 rq->timeout = SD_TIMEOUT; 1044 rq->retries = SD_MAX_RETRIES; 1045 rq->cmd[0] = SYNCHRONIZE_CACHE; 1046 rq->cmd_len = 10; 1047 } 1048 1049 static void sd_rescan(struct device *dev) 1050 { 1051 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1052 1053 if (sdkp) { 1054 revalidate_disk(sdkp->disk); 1055 scsi_disk_put(sdkp); 1056 } 1057 } 1058 1059 1060 #ifdef CONFIG_COMPAT 1061 /* 1062 * This gets directly called from VFS. When the ioctl 1063 * is not recognized we go back to the other translation paths. 1064 */ 1065 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1066 unsigned int cmd, unsigned long arg) 1067 { 1068 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1069 1070 /* 1071 * If we are in the middle of error recovery, don't let anyone 1072 * else try and use this device. Also, if error recovery fails, it 1073 * may try and take the device offline, in which case all further 1074 * access to the device is prohibited. 1075 */ 1076 if (!scsi_block_when_processing_errors(sdev)) 1077 return -ENODEV; 1078 1079 if (sdev->host->hostt->compat_ioctl) { 1080 int ret; 1081 1082 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1083 1084 return ret; 1085 } 1086 1087 /* 1088 * Let the static ioctl translation table take care of it. 1089 */ 1090 return -ENOIOCTLCMD; 1091 } 1092 #endif 1093 1094 static const struct block_device_operations sd_fops = { 1095 .owner = THIS_MODULE, 1096 .open = sd_open, 1097 .release = sd_release, 1098 .locked_ioctl = sd_ioctl, 1099 .getgeo = sd_getgeo, 1100 #ifdef CONFIG_COMPAT 1101 .compat_ioctl = sd_compat_ioctl, 1102 #endif 1103 .media_changed = sd_media_changed, 1104 .revalidate_disk = sd_revalidate_disk, 1105 .unlock_native_capacity = sd_unlock_native_capacity, 1106 }; 1107 1108 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1109 { 1110 u64 start_lba = blk_rq_pos(scmd->request); 1111 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); 1112 u64 bad_lba; 1113 int info_valid; 1114 1115 if (!blk_fs_request(scmd->request)) 1116 return 0; 1117 1118 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 1119 SCSI_SENSE_BUFFERSIZE, 1120 &bad_lba); 1121 if (!info_valid) 1122 return 0; 1123 1124 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 1125 return 0; 1126 1127 if (scmd->device->sector_size < 512) { 1128 /* only legitimate sector_size here is 256 */ 1129 start_lba <<= 1; 1130 end_lba <<= 1; 1131 } else { 1132 /* be careful ... don't want any overflows */ 1133 u64 factor = scmd->device->sector_size / 512; 1134 do_div(start_lba, factor); 1135 do_div(end_lba, factor); 1136 } 1137 1138 /* The bad lba was reported incorrectly, we have no idea where 1139 * the error is. 1140 */ 1141 if (bad_lba < start_lba || bad_lba >= end_lba) 1142 return 0; 1143 1144 /* This computation should always be done in terms of 1145 * the resolution of the device's medium. 1146 */ 1147 return (bad_lba - start_lba) * scmd->device->sector_size; 1148 } 1149 1150 /** 1151 * sd_done - bottom half handler: called when the lower level 1152 * driver has completed (successfully or otherwise) a scsi command. 1153 * @SCpnt: mid-level's per command structure. 1154 * 1155 * Note: potentially run from within an ISR. Must not block. 1156 **/ 1157 static int sd_done(struct scsi_cmnd *SCpnt) 1158 { 1159 int result = SCpnt->result; 1160 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1161 struct scsi_sense_hdr sshdr; 1162 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1163 int sense_valid = 0; 1164 int sense_deferred = 0; 1165 1166 if (result) { 1167 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1168 if (sense_valid) 1169 sense_deferred = scsi_sense_is_deferred(&sshdr); 1170 } 1171 #ifdef CONFIG_SCSI_LOGGING 1172 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 1173 if (sense_valid) { 1174 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1175 "sd_done: sb[respc,sk,asc," 1176 "ascq]=%x,%x,%x,%x\n", 1177 sshdr.response_code, 1178 sshdr.sense_key, sshdr.asc, 1179 sshdr.ascq)); 1180 } 1181 #endif 1182 if (driver_byte(result) != DRIVER_SENSE && 1183 (!sense_valid || sense_deferred)) 1184 goto out; 1185 1186 switch (sshdr.sense_key) { 1187 case HARDWARE_ERROR: 1188 case MEDIUM_ERROR: 1189 good_bytes = sd_completed_bytes(SCpnt); 1190 break; 1191 case RECOVERED_ERROR: 1192 good_bytes = scsi_bufflen(SCpnt); 1193 break; 1194 case NO_SENSE: 1195 /* This indicates a false check condition, so ignore it. An 1196 * unknown amount of data was transferred so treat it as an 1197 * error. 1198 */ 1199 scsi_print_sense("sd", SCpnt); 1200 SCpnt->result = 0; 1201 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1202 break; 1203 case ABORTED_COMMAND: /* DIF: Target detected corruption */ 1204 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */ 1205 if (sshdr.asc == 0x10) 1206 good_bytes = sd_completed_bytes(SCpnt); 1207 break; 1208 default: 1209 break; 1210 } 1211 out: 1212 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1213 sd_dif_complete(SCpnt, good_bytes); 1214 1215 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type) 1216 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) { 1217 1218 /* We have to print a failed command here as the 1219 * extended CDB gets freed before scsi_io_completion() 1220 * is called. 1221 */ 1222 if (result) 1223 scsi_print_command(SCpnt); 1224 1225 mempool_free(SCpnt->cmnd, sd_cdb_pool); 1226 SCpnt->cmnd = NULL; 1227 SCpnt->cmd_len = 0; 1228 } 1229 1230 return good_bytes; 1231 } 1232 1233 static int media_not_present(struct scsi_disk *sdkp, 1234 struct scsi_sense_hdr *sshdr) 1235 { 1236 1237 if (!scsi_sense_valid(sshdr)) 1238 return 0; 1239 /* not invoked for commands that could return deferred errors */ 1240 if (sshdr->sense_key != NOT_READY && 1241 sshdr->sense_key != UNIT_ATTENTION) 1242 return 0; 1243 if (sshdr->asc != 0x3A) /* medium not present */ 1244 return 0; 1245 1246 set_media_not_present(sdkp); 1247 return 1; 1248 } 1249 1250 /* 1251 * spinup disk - called only in sd_revalidate_disk() 1252 */ 1253 static void 1254 sd_spinup_disk(struct scsi_disk *sdkp) 1255 { 1256 unsigned char cmd[10]; 1257 unsigned long spintime_expire = 0; 1258 int retries, spintime; 1259 unsigned int the_result; 1260 struct scsi_sense_hdr sshdr; 1261 int sense_valid = 0; 1262 1263 spintime = 0; 1264 1265 /* Spin up drives, as required. Only do this at boot time */ 1266 /* Spinup needs to be done for module loads too. */ 1267 do { 1268 retries = 0; 1269 1270 do { 1271 cmd[0] = TEST_UNIT_READY; 1272 memset((void *) &cmd[1], 0, 9); 1273 1274 the_result = scsi_execute_req(sdkp->device, cmd, 1275 DMA_NONE, NULL, 0, 1276 &sshdr, SD_TIMEOUT, 1277 SD_MAX_RETRIES, NULL); 1278 1279 /* 1280 * If the drive has indicated to us that it 1281 * doesn't have any media in it, don't bother 1282 * with any more polling. 1283 */ 1284 if (media_not_present(sdkp, &sshdr)) 1285 return; 1286 1287 if (the_result) 1288 sense_valid = scsi_sense_valid(&sshdr); 1289 retries++; 1290 } while (retries < 3 && 1291 (!scsi_status_is_good(the_result) || 1292 ((driver_byte(the_result) & DRIVER_SENSE) && 1293 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1294 1295 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1296 /* no sense, TUR either succeeded or failed 1297 * with a status error */ 1298 if(!spintime && !scsi_status_is_good(the_result)) { 1299 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1300 sd_print_result(sdkp, the_result); 1301 } 1302 break; 1303 } 1304 1305 /* 1306 * The device does not want the automatic start to be issued. 1307 */ 1308 if (sdkp->device->no_start_on_add) 1309 break; 1310 1311 if (sense_valid && sshdr.sense_key == NOT_READY) { 1312 if (sshdr.asc == 4 && sshdr.ascq == 3) 1313 break; /* manual intervention required */ 1314 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 1315 break; /* standby */ 1316 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 1317 break; /* unavailable */ 1318 /* 1319 * Issue command to spin up drive when not ready 1320 */ 1321 if (!spintime) { 1322 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1323 cmd[0] = START_STOP; 1324 cmd[1] = 1; /* Return immediately */ 1325 memset((void *) &cmd[2], 0, 8); 1326 cmd[4] = 1; /* Start spin cycle */ 1327 if (sdkp->device->start_stop_pwr_cond) 1328 cmd[4] |= 1 << 4; 1329 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1330 NULL, 0, &sshdr, 1331 SD_TIMEOUT, SD_MAX_RETRIES, 1332 NULL); 1333 spintime_expire = jiffies + 100 * HZ; 1334 spintime = 1; 1335 } 1336 /* Wait 1 second for next try */ 1337 msleep(1000); 1338 printk("."); 1339 1340 /* 1341 * Wait for USB flash devices with slow firmware. 1342 * Yes, this sense key/ASC combination shouldn't 1343 * occur here. It's characteristic of these devices. 1344 */ 1345 } else if (sense_valid && 1346 sshdr.sense_key == UNIT_ATTENTION && 1347 sshdr.asc == 0x28) { 1348 if (!spintime) { 1349 spintime_expire = jiffies + 5 * HZ; 1350 spintime = 1; 1351 } 1352 /* Wait 1 second for next try */ 1353 msleep(1000); 1354 } else { 1355 /* we don't understand the sense code, so it's 1356 * probably pointless to loop */ 1357 if(!spintime) { 1358 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1359 sd_print_sense_hdr(sdkp, &sshdr); 1360 } 1361 break; 1362 } 1363 1364 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1365 1366 if (spintime) { 1367 if (scsi_status_is_good(the_result)) 1368 printk("ready\n"); 1369 else 1370 printk("not responding...\n"); 1371 } 1372 } 1373 1374 1375 /* 1376 * Determine whether disk supports Data Integrity Field. 1377 */ 1378 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1379 { 1380 struct scsi_device *sdp = sdkp->device; 1381 u8 type; 1382 1383 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1384 return; 1385 1386 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1387 1388 if (type == sdkp->protection_type || !sdkp->first_scan) 1389 return; 1390 1391 sdkp->protection_type = type; 1392 1393 if (type > SD_DIF_TYPE3_PROTECTION) { 1394 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \ 1395 "protection type %u. Disabling disk!\n", type); 1396 sdkp->capacity = 0; 1397 return; 1398 } 1399 1400 if (scsi_host_dif_capable(sdp->host, type)) 1401 sd_printk(KERN_NOTICE, sdkp, 1402 "Enabling DIF Type %u protection\n", type); 1403 else 1404 sd_printk(KERN_NOTICE, sdkp, 1405 "Disabling DIF Type %u protection\n", type); 1406 } 1407 1408 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 1409 struct scsi_sense_hdr *sshdr, int sense_valid, 1410 int the_result) 1411 { 1412 sd_print_result(sdkp, the_result); 1413 if (driver_byte(the_result) & DRIVER_SENSE) 1414 sd_print_sense_hdr(sdkp, sshdr); 1415 else 1416 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1417 1418 /* 1419 * Set dirty bit for removable devices if not ready - 1420 * sometimes drives will not report this properly. 1421 */ 1422 if (sdp->removable && 1423 sense_valid && sshdr->sense_key == NOT_READY) 1424 sdp->changed = 1; 1425 1426 /* 1427 * We used to set media_present to 0 here to indicate no media 1428 * in the drive, but some drives fail read capacity even with 1429 * media present, so we can't do that. 1430 */ 1431 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1432 } 1433 1434 #define RC16_LEN 32 1435 #if RC16_LEN > SD_BUF_SIZE 1436 #error RC16_LEN must not be more than SD_BUF_SIZE 1437 #endif 1438 1439 #define READ_CAPACITY_RETRIES_ON_RESET 10 1440 1441 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 1442 unsigned char *buffer) 1443 { 1444 unsigned char cmd[16]; 1445 struct scsi_sense_hdr sshdr; 1446 int sense_valid = 0; 1447 int the_result; 1448 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1449 unsigned int alignment; 1450 unsigned long long lba; 1451 unsigned sector_size; 1452 1453 do { 1454 memset(cmd, 0, 16); 1455 cmd[0] = SERVICE_ACTION_IN; 1456 cmd[1] = SAI_READ_CAPACITY_16; 1457 cmd[13] = RC16_LEN; 1458 memset(buffer, 0, RC16_LEN); 1459 1460 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1461 buffer, RC16_LEN, &sshdr, 1462 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1463 1464 if (media_not_present(sdkp, &sshdr)) 1465 return -ENODEV; 1466 1467 if (the_result) { 1468 sense_valid = scsi_sense_valid(&sshdr); 1469 if (sense_valid && 1470 sshdr.sense_key == ILLEGAL_REQUEST && 1471 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 1472 sshdr.ascq == 0x00) 1473 /* Invalid Command Operation Code or 1474 * Invalid Field in CDB, just retry 1475 * silently with RC10 */ 1476 return -EINVAL; 1477 if (sense_valid && 1478 sshdr.sense_key == UNIT_ATTENTION && 1479 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1480 /* Device reset might occur several times, 1481 * give it one more chance */ 1482 if (--reset_retries > 0) 1483 continue; 1484 } 1485 retries--; 1486 1487 } while (the_result && retries); 1488 1489 if (the_result) { 1490 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1491 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1492 return -EINVAL; 1493 } 1494 1495 sector_size = get_unaligned_be32(&buffer[8]); 1496 lba = get_unaligned_be64(&buffer[0]); 1497 1498 sd_read_protection_type(sdkp, buffer); 1499 1500 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { 1501 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1502 "kernel compiled with support for large block " 1503 "devices.\n"); 1504 sdkp->capacity = 0; 1505 return -EOVERFLOW; 1506 } 1507 1508 /* Logical blocks per physical block exponent */ 1509 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size; 1510 1511 /* Lowest aligned logical block */ 1512 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 1513 blk_queue_alignment_offset(sdp->request_queue, alignment); 1514 if (alignment && sdkp->first_scan) 1515 sd_printk(KERN_NOTICE, sdkp, 1516 "physical block alignment offset: %u\n", alignment); 1517 1518 if (buffer[14] & 0x80) { /* TPE */ 1519 struct request_queue *q = sdp->request_queue; 1520 1521 sdkp->thin_provisioning = 1; 1522 q->limits.discard_granularity = sdkp->hw_sector_size; 1523 q->limits.max_discard_sectors = 0xffffffff; 1524 1525 if (buffer[14] & 0x40) /* TPRZ */ 1526 q->limits.discard_zeroes_data = 1; 1527 1528 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); 1529 } 1530 1531 sdkp->capacity = lba + 1; 1532 return sector_size; 1533 } 1534 1535 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 1536 unsigned char *buffer) 1537 { 1538 unsigned char cmd[16]; 1539 struct scsi_sense_hdr sshdr; 1540 int sense_valid = 0; 1541 int the_result; 1542 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1543 sector_t lba; 1544 unsigned sector_size; 1545 1546 do { 1547 cmd[0] = READ_CAPACITY; 1548 memset(&cmd[1], 0, 9); 1549 memset(buffer, 0, 8); 1550 1551 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1552 buffer, 8, &sshdr, 1553 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1554 1555 if (media_not_present(sdkp, &sshdr)) 1556 return -ENODEV; 1557 1558 if (the_result) { 1559 sense_valid = scsi_sense_valid(&sshdr); 1560 if (sense_valid && 1561 sshdr.sense_key == UNIT_ATTENTION && 1562 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1563 /* Device reset might occur several times, 1564 * give it one more chance */ 1565 if (--reset_retries > 0) 1566 continue; 1567 } 1568 retries--; 1569 1570 } while (the_result && retries); 1571 1572 if (the_result) { 1573 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 1574 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1575 return -EINVAL; 1576 } 1577 1578 sector_size = get_unaligned_be32(&buffer[4]); 1579 lba = get_unaligned_be32(&buffer[0]); 1580 1581 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { 1582 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1583 "kernel compiled with support for large block " 1584 "devices.\n"); 1585 sdkp->capacity = 0; 1586 return -EOVERFLOW; 1587 } 1588 1589 sdkp->capacity = lba + 1; 1590 sdkp->hw_sector_size = sector_size; 1591 return sector_size; 1592 } 1593 1594 static int sd_try_rc16_first(struct scsi_device *sdp) 1595 { 1596 if (sdp->host->max_cmd_len < 16) 1597 return 0; 1598 if (sdp->scsi_level > SCSI_SPC_2) 1599 return 1; 1600 if (scsi_device_protection(sdp)) 1601 return 1; 1602 return 0; 1603 } 1604 1605 /* 1606 * read disk capacity 1607 */ 1608 static void 1609 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 1610 { 1611 int sector_size; 1612 struct scsi_device *sdp = sdkp->device; 1613 sector_t old_capacity = sdkp->capacity; 1614 1615 if (sd_try_rc16_first(sdp)) { 1616 sector_size = read_capacity_16(sdkp, sdp, buffer); 1617 if (sector_size == -EOVERFLOW) 1618 goto got_data; 1619 if (sector_size == -ENODEV) 1620 return; 1621 if (sector_size < 0) 1622 sector_size = read_capacity_10(sdkp, sdp, buffer); 1623 if (sector_size < 0) 1624 return; 1625 } else { 1626 sector_size = read_capacity_10(sdkp, sdp, buffer); 1627 if (sector_size == -EOVERFLOW) 1628 goto got_data; 1629 if (sector_size < 0) 1630 return; 1631 if ((sizeof(sdkp->capacity) > 4) && 1632 (sdkp->capacity > 0xffffffffULL)) { 1633 int old_sector_size = sector_size; 1634 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 1635 "Trying to use READ CAPACITY(16).\n"); 1636 sector_size = read_capacity_16(sdkp, sdp, buffer); 1637 if (sector_size < 0) { 1638 sd_printk(KERN_NOTICE, sdkp, 1639 "Using 0xffffffff as device size\n"); 1640 sdkp->capacity = 1 + (sector_t) 0xffffffff; 1641 sector_size = old_sector_size; 1642 goto got_data; 1643 } 1644 } 1645 } 1646 1647 /* Some devices are known to return the total number of blocks, 1648 * not the highest block number. Some devices have versions 1649 * which do this and others which do not. Some devices we might 1650 * suspect of doing this but we don't know for certain. 1651 * 1652 * If we know the reported capacity is wrong, decrement it. If 1653 * we can only guess, then assume the number of blocks is even 1654 * (usually true but not always) and err on the side of lowering 1655 * the capacity. 1656 */ 1657 if (sdp->fix_capacity || 1658 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 1659 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 1660 "from its reported value: %llu\n", 1661 (unsigned long long) sdkp->capacity); 1662 --sdkp->capacity; 1663 } 1664 1665 got_data: 1666 if (sector_size == 0) { 1667 sector_size = 512; 1668 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 1669 "assuming 512.\n"); 1670 } 1671 1672 if (sector_size != 512 && 1673 sector_size != 1024 && 1674 sector_size != 2048 && 1675 sector_size != 4096 && 1676 sector_size != 256) { 1677 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 1678 sector_size); 1679 /* 1680 * The user might want to re-format the drive with 1681 * a supported sectorsize. Once this happens, it 1682 * would be relatively trivial to set the thing up. 1683 * For this reason, we leave the thing in the table. 1684 */ 1685 sdkp->capacity = 0; 1686 /* 1687 * set a bogus sector size so the normal read/write 1688 * logic in the block layer will eventually refuse any 1689 * request on this device without tripping over power 1690 * of two sector size assumptions 1691 */ 1692 sector_size = 512; 1693 } 1694 blk_queue_logical_block_size(sdp->request_queue, sector_size); 1695 1696 { 1697 char cap_str_2[10], cap_str_10[10]; 1698 u64 sz = (u64)sdkp->capacity << ilog2(sector_size); 1699 1700 string_get_size(sz, STRING_UNITS_2, cap_str_2, 1701 sizeof(cap_str_2)); 1702 string_get_size(sz, STRING_UNITS_10, cap_str_10, 1703 sizeof(cap_str_10)); 1704 1705 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 1706 sd_printk(KERN_NOTICE, sdkp, 1707 "%llu %d-byte logical blocks: (%s/%s)\n", 1708 (unsigned long long)sdkp->capacity, 1709 sector_size, cap_str_10, cap_str_2); 1710 1711 if (sdkp->hw_sector_size != sector_size) 1712 sd_printk(KERN_NOTICE, sdkp, 1713 "%u-byte physical blocks\n", 1714 sdkp->hw_sector_size); 1715 } 1716 } 1717 1718 /* Rescale capacity to 512-byte units */ 1719 if (sector_size == 4096) 1720 sdkp->capacity <<= 3; 1721 else if (sector_size == 2048) 1722 sdkp->capacity <<= 2; 1723 else if (sector_size == 1024) 1724 sdkp->capacity <<= 1; 1725 else if (sector_size == 256) 1726 sdkp->capacity >>= 1; 1727 1728 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size); 1729 sdkp->device->sector_size = sector_size; 1730 } 1731 1732 /* called with buffer of length 512 */ 1733 static inline int 1734 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 1735 unsigned char *buffer, int len, struct scsi_mode_data *data, 1736 struct scsi_sense_hdr *sshdr) 1737 { 1738 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 1739 SD_TIMEOUT, SD_MAX_RETRIES, data, 1740 sshdr); 1741 } 1742 1743 /* 1744 * read write protect setting, if possible - called only in sd_revalidate_disk() 1745 * called with buffer of length SD_BUF_SIZE 1746 */ 1747 static void 1748 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 1749 { 1750 int res; 1751 struct scsi_device *sdp = sdkp->device; 1752 struct scsi_mode_data data; 1753 int old_wp = sdkp->write_prot; 1754 1755 set_disk_ro(sdkp->disk, 0); 1756 if (sdp->skip_ms_page_3f) { 1757 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 1758 return; 1759 } 1760 1761 if (sdp->use_192_bytes_for_3f) { 1762 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 1763 } else { 1764 /* 1765 * First attempt: ask for all pages (0x3F), but only 4 bytes. 1766 * We have to start carefully: some devices hang if we ask 1767 * for more than is available. 1768 */ 1769 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 1770 1771 /* 1772 * Second attempt: ask for page 0 When only page 0 is 1773 * implemented, a request for page 3F may return Sense Key 1774 * 5: Illegal Request, Sense Code 24: Invalid field in 1775 * CDB. 1776 */ 1777 if (!scsi_status_is_good(res)) 1778 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 1779 1780 /* 1781 * Third attempt: ask 255 bytes, as we did earlier. 1782 */ 1783 if (!scsi_status_is_good(res)) 1784 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 1785 &data, NULL); 1786 } 1787 1788 if (!scsi_status_is_good(res)) { 1789 sd_printk(KERN_WARNING, sdkp, 1790 "Test WP failed, assume Write Enabled\n"); 1791 } else { 1792 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 1793 set_disk_ro(sdkp->disk, sdkp->write_prot); 1794 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 1795 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 1796 sdkp->write_prot ? "on" : "off"); 1797 sd_printk(KERN_DEBUG, sdkp, 1798 "Mode Sense: %02x %02x %02x %02x\n", 1799 buffer[0], buffer[1], buffer[2], buffer[3]); 1800 } 1801 } 1802 } 1803 1804 /* 1805 * sd_read_cache_type - called only from sd_revalidate_disk() 1806 * called with buffer of length SD_BUF_SIZE 1807 */ 1808 static void 1809 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 1810 { 1811 int len = 0, res; 1812 struct scsi_device *sdp = sdkp->device; 1813 1814 int dbd; 1815 int modepage; 1816 struct scsi_mode_data data; 1817 struct scsi_sense_hdr sshdr; 1818 int old_wce = sdkp->WCE; 1819 int old_rcd = sdkp->RCD; 1820 int old_dpofua = sdkp->DPOFUA; 1821 1822 if (sdp->skip_ms_page_8) 1823 goto defaults; 1824 1825 if (sdp->type == TYPE_RBC) { 1826 modepage = 6; 1827 dbd = 8; 1828 } else { 1829 modepage = 8; 1830 dbd = 0; 1831 } 1832 1833 /* cautiously ask */ 1834 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); 1835 1836 if (!scsi_status_is_good(res)) 1837 goto bad_sense; 1838 1839 if (!data.header_length) { 1840 modepage = 6; 1841 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 1842 } 1843 1844 /* that went OK, now ask for the proper length */ 1845 len = data.length; 1846 1847 /* 1848 * We're only interested in the first three bytes, actually. 1849 * But the data cache page is defined for the first 20. 1850 */ 1851 if (len < 3) 1852 goto bad_sense; 1853 if (len > 20) 1854 len = 20; 1855 1856 /* Take headers and block descriptors into account */ 1857 len += data.header_length + data.block_descriptor_length; 1858 if (len > SD_BUF_SIZE) 1859 goto bad_sense; 1860 1861 /* Get the data */ 1862 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); 1863 1864 if (scsi_status_is_good(res)) { 1865 int offset = data.header_length + data.block_descriptor_length; 1866 1867 if (offset >= SD_BUF_SIZE - 2) { 1868 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); 1869 goto defaults; 1870 } 1871 1872 if ((buffer[offset] & 0x3f) != modepage) { 1873 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 1874 goto defaults; 1875 } 1876 1877 if (modepage == 8) { 1878 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 1879 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 1880 } else { 1881 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 1882 sdkp->RCD = 0; 1883 } 1884 1885 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 1886 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 1887 sd_printk(KERN_NOTICE, sdkp, 1888 "Uses READ/WRITE(6), disabling FUA\n"); 1889 sdkp->DPOFUA = 0; 1890 } 1891 1892 if (sdkp->first_scan || old_wce != sdkp->WCE || 1893 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 1894 sd_printk(KERN_NOTICE, sdkp, 1895 "Write cache: %s, read cache: %s, %s\n", 1896 sdkp->WCE ? "enabled" : "disabled", 1897 sdkp->RCD ? "disabled" : "enabled", 1898 sdkp->DPOFUA ? "supports DPO and FUA" 1899 : "doesn't support DPO or FUA"); 1900 1901 return; 1902 } 1903 1904 bad_sense: 1905 if (scsi_sense_valid(&sshdr) && 1906 sshdr.sense_key == ILLEGAL_REQUEST && 1907 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 1908 /* Invalid field in CDB */ 1909 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 1910 else 1911 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 1912 1913 defaults: 1914 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 1915 sdkp->WCE = 0; 1916 sdkp->RCD = 0; 1917 sdkp->DPOFUA = 0; 1918 } 1919 1920 /* 1921 * The ATO bit indicates whether the DIF application tag is available 1922 * for use by the operating system. 1923 */ 1924 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 1925 { 1926 int res, offset; 1927 struct scsi_device *sdp = sdkp->device; 1928 struct scsi_mode_data data; 1929 struct scsi_sense_hdr sshdr; 1930 1931 if (sdp->type != TYPE_DISK) 1932 return; 1933 1934 if (sdkp->protection_type == 0) 1935 return; 1936 1937 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 1938 SD_MAX_RETRIES, &data, &sshdr); 1939 1940 if (!scsi_status_is_good(res) || !data.header_length || 1941 data.length < 6) { 1942 sd_printk(KERN_WARNING, sdkp, 1943 "getting Control mode page failed, assume no ATO\n"); 1944 1945 if (scsi_sense_valid(&sshdr)) 1946 sd_print_sense_hdr(sdkp, &sshdr); 1947 1948 return; 1949 } 1950 1951 offset = data.header_length + data.block_descriptor_length; 1952 1953 if ((buffer[offset] & 0x3f) != 0x0a) { 1954 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 1955 return; 1956 } 1957 1958 if ((buffer[offset + 5] & 0x80) == 0) 1959 return; 1960 1961 sdkp->ATO = 1; 1962 1963 return; 1964 } 1965 1966 /** 1967 * sd_read_block_limits - Query disk device for preferred I/O sizes. 1968 * @disk: disk to query 1969 */ 1970 static void sd_read_block_limits(struct scsi_disk *sdkp) 1971 { 1972 struct request_queue *q = sdkp->disk->queue; 1973 unsigned int sector_sz = sdkp->device->sector_size; 1974 const int vpd_len = 64; 1975 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 1976 1977 if (!buffer || 1978 /* Block Limits VPD */ 1979 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 1980 goto out; 1981 1982 blk_queue_io_min(sdkp->disk->queue, 1983 get_unaligned_be16(&buffer[6]) * sector_sz); 1984 blk_queue_io_opt(sdkp->disk->queue, 1985 get_unaligned_be32(&buffer[12]) * sector_sz); 1986 1987 /* Thin provisioning enabled and page length indicates TP support */ 1988 if (sdkp->thin_provisioning && buffer[3] == 0x3c) { 1989 unsigned int lba_count, desc_count, granularity; 1990 1991 lba_count = get_unaligned_be32(&buffer[20]); 1992 desc_count = get_unaligned_be32(&buffer[24]); 1993 1994 if (lba_count) { 1995 q->limits.max_discard_sectors = 1996 lba_count * sector_sz >> 9; 1997 1998 if (desc_count) 1999 sdkp->unmap = 1; 2000 } 2001 2002 granularity = get_unaligned_be32(&buffer[28]); 2003 2004 if (granularity) 2005 q->limits.discard_granularity = granularity * sector_sz; 2006 2007 if (buffer[32] & 0x80) 2008 q->limits.discard_alignment = 2009 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 2010 } 2011 2012 out: 2013 kfree(buffer); 2014 } 2015 2016 /** 2017 * sd_read_block_characteristics - Query block dev. characteristics 2018 * @disk: disk to query 2019 */ 2020 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2021 { 2022 unsigned char *buffer; 2023 u16 rot; 2024 const int vpd_len = 64; 2025 2026 buffer = kmalloc(vpd_len, GFP_KERNEL); 2027 2028 if (!buffer || 2029 /* Block Device Characteristics VPD */ 2030 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2031 goto out; 2032 2033 rot = get_unaligned_be16(&buffer[4]); 2034 2035 if (rot == 1) 2036 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); 2037 2038 out: 2039 kfree(buffer); 2040 } 2041 2042 static int sd_try_extended_inquiry(struct scsi_device *sdp) 2043 { 2044 /* 2045 * Although VPD inquiries can go to SCSI-2 type devices, 2046 * some USB ones crash on receiving them, and the pages 2047 * we currently ask for are for SPC-3 and beyond 2048 */ 2049 if (sdp->scsi_level > SCSI_SPC_2) 2050 return 1; 2051 return 0; 2052 } 2053 2054 /** 2055 * sd_revalidate_disk - called the first time a new disk is seen, 2056 * performs disk spin up, read_capacity, etc. 2057 * @disk: struct gendisk we care about 2058 **/ 2059 static int sd_revalidate_disk(struct gendisk *disk) 2060 { 2061 struct scsi_disk *sdkp = scsi_disk(disk); 2062 struct scsi_device *sdp = sdkp->device; 2063 unsigned char *buffer; 2064 unsigned ordered; 2065 2066 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 2067 "sd_revalidate_disk\n")); 2068 2069 /* 2070 * If the device is offline, don't try and read capacity or any 2071 * of the other niceties. 2072 */ 2073 if (!scsi_device_online(sdp)) 2074 goto out; 2075 2076 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 2077 if (!buffer) { 2078 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 2079 "allocation failure.\n"); 2080 goto out; 2081 } 2082 2083 sd_spinup_disk(sdkp); 2084 2085 /* 2086 * Without media there is no reason to ask; moreover, some devices 2087 * react badly if we do. 2088 */ 2089 if (sdkp->media_present) { 2090 sd_read_capacity(sdkp, buffer); 2091 2092 if (sd_try_extended_inquiry(sdp)) { 2093 sd_read_block_limits(sdkp); 2094 sd_read_block_characteristics(sdkp); 2095 } 2096 2097 sd_read_write_protect_flag(sdkp, buffer); 2098 sd_read_cache_type(sdkp, buffer); 2099 sd_read_app_tag_own(sdkp, buffer); 2100 } 2101 2102 sdkp->first_scan = 0; 2103 2104 /* 2105 * We now have all cache related info, determine how we deal 2106 * with ordered requests. Note that as the current SCSI 2107 * dispatch function can alter request order, we cannot use 2108 * QUEUE_ORDERED_TAG_* even when ordered tag is supported. 2109 */ 2110 if (sdkp->WCE) 2111 ordered = sdkp->DPOFUA 2112 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; 2113 else 2114 ordered = QUEUE_ORDERED_DRAIN; 2115 2116 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); 2117 2118 set_capacity(disk, sdkp->capacity); 2119 kfree(buffer); 2120 2121 out: 2122 return 0; 2123 } 2124 2125 /** 2126 * sd_unlock_native_capacity - unlock native capacity 2127 * @disk: struct gendisk to set capacity for 2128 * 2129 * Block layer calls this function if it detects that partitions 2130 * on @disk reach beyond the end of the device. If the SCSI host 2131 * implements ->unlock_native_capacity() method, it's invoked to 2132 * give it a chance to adjust the device capacity. 2133 * 2134 * CONTEXT: 2135 * Defined by block layer. Might sleep. 2136 */ 2137 static void sd_unlock_native_capacity(struct gendisk *disk) 2138 { 2139 struct scsi_device *sdev = scsi_disk(disk)->device; 2140 2141 if (sdev->host->hostt->unlock_native_capacity) 2142 sdev->host->hostt->unlock_native_capacity(sdev); 2143 } 2144 2145 /** 2146 * sd_format_disk_name - format disk name 2147 * @prefix: name prefix - ie. "sd" for SCSI disks 2148 * @index: index of the disk to format name for 2149 * @buf: output buffer 2150 * @buflen: length of the output buffer 2151 * 2152 * SCSI disk names starts at sda. The 26th device is sdz and the 2153 * 27th is sdaa. The last one for two lettered suffix is sdzz 2154 * which is followed by sdaaa. 2155 * 2156 * This is basically 26 base counting with one extra 'nil' entry 2157 * at the beginning from the second digit on and can be 2158 * determined using similar method as 26 base conversion with the 2159 * index shifted -1 after each digit is computed. 2160 * 2161 * CONTEXT: 2162 * Don't care. 2163 * 2164 * RETURNS: 2165 * 0 on success, -errno on failure. 2166 */ 2167 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 2168 { 2169 const int base = 'z' - 'a' + 1; 2170 char *begin = buf + strlen(prefix); 2171 char *end = buf + buflen; 2172 char *p; 2173 int unit; 2174 2175 p = end - 1; 2176 *p = '\0'; 2177 unit = base; 2178 do { 2179 if (p == begin) 2180 return -EINVAL; 2181 *--p = 'a' + (index % unit); 2182 index = (index / unit) - 1; 2183 } while (index >= 0); 2184 2185 memmove(begin, p, end - p); 2186 memcpy(buf, prefix, strlen(prefix)); 2187 2188 return 0; 2189 } 2190 2191 /* 2192 * The asynchronous part of sd_probe 2193 */ 2194 static void sd_probe_async(void *data, async_cookie_t cookie) 2195 { 2196 struct scsi_disk *sdkp = data; 2197 struct scsi_device *sdp; 2198 struct gendisk *gd; 2199 u32 index; 2200 struct device *dev; 2201 2202 sdp = sdkp->device; 2203 gd = sdkp->disk; 2204 index = sdkp->index; 2205 dev = &sdp->sdev_gendev; 2206 2207 if (index < SD_MAX_DISKS) { 2208 gd->major = sd_major((index & 0xf0) >> 4); 2209 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 2210 gd->minors = SD_MINORS; 2211 } 2212 gd->fops = &sd_fops; 2213 gd->private_data = &sdkp->driver; 2214 gd->queue = sdkp->device->request_queue; 2215 2216 /* defaults, until the device tells us otherwise */ 2217 sdp->sector_size = 512; 2218 sdkp->capacity = 0; 2219 sdkp->media_present = 1; 2220 sdkp->write_prot = 0; 2221 sdkp->WCE = 0; 2222 sdkp->RCD = 0; 2223 sdkp->ATO = 0; 2224 sdkp->first_scan = 1; 2225 2226 sd_revalidate_disk(gd); 2227 2228 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); 2229 2230 gd->driverfs_dev = &sdp->sdev_gendev; 2231 gd->flags = GENHD_FL_EXT_DEVT; 2232 if (sdp->removable) 2233 gd->flags |= GENHD_FL_REMOVABLE; 2234 2235 dev_set_drvdata(dev, sdkp); 2236 add_disk(gd); 2237 sd_dif_config_host(sdkp); 2238 2239 sd_revalidate_disk(gd); 2240 2241 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 2242 sdp->removable ? "removable " : ""); 2243 put_device(&sdkp->dev); 2244 } 2245 2246 /** 2247 * sd_probe - called during driver initialization and whenever a 2248 * new scsi device is attached to the system. It is called once 2249 * for each scsi device (not just disks) present. 2250 * @dev: pointer to device object 2251 * 2252 * Returns 0 if successful (or not interested in this scsi device 2253 * (e.g. scanner)); 1 when there is an error. 2254 * 2255 * Note: this function is invoked from the scsi mid-level. 2256 * This function sets up the mapping between a given 2257 * <host,channel,id,lun> (found in sdp) and new device name 2258 * (e.g. /dev/sda). More precisely it is the block device major 2259 * and minor number that is chosen here. 2260 * 2261 * Assume sd_attach is not re-entrant (for time being) 2262 * Also think about sd_attach() and sd_remove() running coincidentally. 2263 **/ 2264 static int sd_probe(struct device *dev) 2265 { 2266 struct scsi_device *sdp = to_scsi_device(dev); 2267 struct scsi_disk *sdkp; 2268 struct gendisk *gd; 2269 u32 index; 2270 int error; 2271 2272 error = -ENODEV; 2273 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 2274 goto out; 2275 2276 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 2277 "sd_attach\n")); 2278 2279 error = -ENOMEM; 2280 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 2281 if (!sdkp) 2282 goto out; 2283 2284 gd = alloc_disk(SD_MINORS); 2285 if (!gd) 2286 goto out_free; 2287 2288 do { 2289 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 2290 goto out_put; 2291 2292 spin_lock(&sd_index_lock); 2293 error = ida_get_new(&sd_index_ida, &index); 2294 spin_unlock(&sd_index_lock); 2295 } while (error == -EAGAIN); 2296 2297 if (error) 2298 goto out_put; 2299 2300 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 2301 if (error) 2302 goto out_free_index; 2303 2304 sdkp->device = sdp; 2305 sdkp->driver = &sd_template; 2306 sdkp->disk = gd; 2307 sdkp->index = index; 2308 sdkp->openers = 0; 2309 sdkp->previous_state = 1; 2310 2311 if (!sdp->request_queue->rq_timeout) { 2312 if (sdp->type != TYPE_MOD) 2313 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 2314 else 2315 blk_queue_rq_timeout(sdp->request_queue, 2316 SD_MOD_TIMEOUT); 2317 } 2318 2319 device_initialize(&sdkp->dev); 2320 sdkp->dev.parent = &sdp->sdev_gendev; 2321 sdkp->dev.class = &sd_disk_class; 2322 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev)); 2323 2324 if (device_add(&sdkp->dev)) 2325 goto out_free_index; 2326 2327 get_device(&sdp->sdev_gendev); 2328 2329 get_device(&sdkp->dev); /* prevent release before async_schedule */ 2330 async_schedule(sd_probe_async, sdkp); 2331 2332 return 0; 2333 2334 out_free_index: 2335 spin_lock(&sd_index_lock); 2336 ida_remove(&sd_index_ida, index); 2337 spin_unlock(&sd_index_lock); 2338 out_put: 2339 put_disk(gd); 2340 out_free: 2341 kfree(sdkp); 2342 out: 2343 return error; 2344 } 2345 2346 /** 2347 * sd_remove - called whenever a scsi disk (previously recognized by 2348 * sd_probe) is detached from the system. It is called (potentially 2349 * multiple times) during sd module unload. 2350 * @sdp: pointer to mid level scsi device object 2351 * 2352 * Note: this function is invoked from the scsi mid-level. 2353 * This function potentially frees up a device name (e.g. /dev/sdc) 2354 * that could be re-used by a subsequent sd_probe(). 2355 * This function is not called when the built-in sd driver is "exit-ed". 2356 **/ 2357 static int sd_remove(struct device *dev) 2358 { 2359 struct scsi_disk *sdkp; 2360 2361 async_synchronize_full(); 2362 sdkp = dev_get_drvdata(dev); 2363 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); 2364 device_del(&sdkp->dev); 2365 del_gendisk(sdkp->disk); 2366 sd_shutdown(dev); 2367 2368 mutex_lock(&sd_ref_mutex); 2369 dev_set_drvdata(dev, NULL); 2370 put_device(&sdkp->dev); 2371 mutex_unlock(&sd_ref_mutex); 2372 2373 return 0; 2374 } 2375 2376 /** 2377 * scsi_disk_release - Called to free the scsi_disk structure 2378 * @dev: pointer to embedded class device 2379 * 2380 * sd_ref_mutex must be held entering this routine. Because it is 2381 * called on last put, you should always use the scsi_disk_get() 2382 * scsi_disk_put() helpers which manipulate the semaphore directly 2383 * and never do a direct put_device. 2384 **/ 2385 static void scsi_disk_release(struct device *dev) 2386 { 2387 struct scsi_disk *sdkp = to_scsi_disk(dev); 2388 struct gendisk *disk = sdkp->disk; 2389 2390 spin_lock(&sd_index_lock); 2391 ida_remove(&sd_index_ida, sdkp->index); 2392 spin_unlock(&sd_index_lock); 2393 2394 disk->private_data = NULL; 2395 put_disk(disk); 2396 put_device(&sdkp->device->sdev_gendev); 2397 2398 kfree(sdkp); 2399 } 2400 2401 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 2402 { 2403 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 2404 struct scsi_sense_hdr sshdr; 2405 struct scsi_device *sdp = sdkp->device; 2406 int res; 2407 2408 if (start) 2409 cmd[4] |= 1; /* START */ 2410 2411 if (sdp->start_stop_pwr_cond) 2412 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 2413 2414 if (!scsi_device_online(sdp)) 2415 return -ENODEV; 2416 2417 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 2418 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2419 if (res) { 2420 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 2421 sd_print_result(sdkp, res); 2422 if (driver_byte(res) & DRIVER_SENSE) 2423 sd_print_sense_hdr(sdkp, &sshdr); 2424 } 2425 2426 return res; 2427 } 2428 2429 /* 2430 * Send a SYNCHRONIZE CACHE instruction down to the device through 2431 * the normal SCSI command structure. Wait for the command to 2432 * complete. 2433 */ 2434 static void sd_shutdown(struct device *dev) 2435 { 2436 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2437 2438 if (!sdkp) 2439 return; /* this can happen */ 2440 2441 if (sdkp->WCE) { 2442 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2443 sd_sync_cache(sdkp); 2444 } 2445 2446 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 2447 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2448 sd_start_stop_device(sdkp, 0); 2449 } 2450 2451 scsi_disk_put(sdkp); 2452 } 2453 2454 static int sd_suspend(struct device *dev, pm_message_t mesg) 2455 { 2456 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2457 int ret = 0; 2458 2459 if (!sdkp) 2460 return 0; /* this can happen */ 2461 2462 if (sdkp->WCE) { 2463 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2464 ret = sd_sync_cache(sdkp); 2465 if (ret) 2466 goto done; 2467 } 2468 2469 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { 2470 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2471 ret = sd_start_stop_device(sdkp, 0); 2472 } 2473 2474 done: 2475 scsi_disk_put(sdkp); 2476 return ret; 2477 } 2478 2479 static int sd_resume(struct device *dev) 2480 { 2481 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2482 int ret = 0; 2483 2484 if (!sdkp->device->manage_start_stop) 2485 goto done; 2486 2487 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 2488 ret = sd_start_stop_device(sdkp, 1); 2489 2490 done: 2491 scsi_disk_put(sdkp); 2492 return ret; 2493 } 2494 2495 /** 2496 * init_sd - entry point for this driver (both when built in or when 2497 * a module). 2498 * 2499 * Note: this function registers this driver with the scsi mid-level. 2500 **/ 2501 static int __init init_sd(void) 2502 { 2503 int majors = 0, i, err; 2504 2505 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 2506 2507 for (i = 0; i < SD_MAJORS; i++) 2508 if (register_blkdev(sd_major(i), "sd") == 0) 2509 majors++; 2510 2511 if (!majors) 2512 return -ENODEV; 2513 2514 err = class_register(&sd_disk_class); 2515 if (err) 2516 goto err_out; 2517 2518 err = scsi_register_driver(&sd_template.gendrv); 2519 if (err) 2520 goto err_out_class; 2521 2522 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 2523 0, 0, NULL); 2524 if (!sd_cdb_cache) { 2525 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 2526 goto err_out_class; 2527 } 2528 2529 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 2530 if (!sd_cdb_pool) { 2531 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 2532 goto err_out_cache; 2533 } 2534 2535 return 0; 2536 2537 err_out_cache: 2538 kmem_cache_destroy(sd_cdb_cache); 2539 2540 err_out_class: 2541 class_unregister(&sd_disk_class); 2542 err_out: 2543 for (i = 0; i < SD_MAJORS; i++) 2544 unregister_blkdev(sd_major(i), "sd"); 2545 return err; 2546 } 2547 2548 /** 2549 * exit_sd - exit point for this driver (when it is a module). 2550 * 2551 * Note: this function unregisters this driver from the scsi mid-level. 2552 **/ 2553 static void __exit exit_sd(void) 2554 { 2555 int i; 2556 2557 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 2558 2559 mempool_destroy(sd_cdb_pool); 2560 kmem_cache_destroy(sd_cdb_cache); 2561 2562 scsi_unregister_driver(&sd_template.gendrv); 2563 class_unregister(&sd_disk_class); 2564 2565 for (i = 0; i < SD_MAJORS; i++) 2566 unregister_blkdev(sd_major(i), "sd"); 2567 } 2568 2569 module_init(init_sd); 2570 module_exit(exit_sd); 2571 2572 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 2573 struct scsi_sense_hdr *sshdr) 2574 { 2575 sd_printk(KERN_INFO, sdkp, ""); 2576 scsi_show_sense_hdr(sshdr); 2577 sd_printk(KERN_INFO, sdkp, ""); 2578 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 2579 } 2580 2581 static void sd_print_result(struct scsi_disk *sdkp, int result) 2582 { 2583 sd_printk(KERN_INFO, sdkp, ""); 2584 scsi_show_result(result); 2585 } 2586 2587