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/smp_lock.h> 50#include <linux/mutex.h> 51#include <linux/string_helpers.h> 52#include <linux/async.h> 53#include <linux/slab.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_logging.h" 69 70MODULE_AUTHOR("Eric Youngdale"); 71MODULE_DESCRIPTION("SCSI disk (sd) driver"); 72MODULE_LICENSE("GPL"); 73 74MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 90MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 91MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 92MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 93 94#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) 95#define SD_MINORS 16 96#else 97#define SD_MINORS 0 98#endif 99 100static int sd_revalidate_disk(struct gendisk *); 101static void sd_unlock_native_capacity(struct gendisk *disk); 102static int sd_probe(struct device *); 103static int sd_remove(struct device *); 104static void sd_shutdown(struct device *); 105static int sd_suspend(struct device *, pm_message_t state); 106static int sd_resume(struct device *); 107static void sd_rescan(struct device *); 108static int sd_done(struct scsi_cmnd *); 109static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); 110static void scsi_disk_release(struct device *cdev); 111static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); 112static void sd_print_result(struct scsi_disk *, int); 113 114static DEFINE_SPINLOCK(sd_index_lock); 115static DEFINE_IDA(sd_index_ida); 116 117/* This semaphore is used to mediate the 0->1 reference get in the 118 * face of object destruction (i.e. we can't allow a get on an 119 * object after last put) */ 120static DEFINE_MUTEX(sd_ref_mutex); 121 122static struct kmem_cache *sd_cdb_cache; 123static mempool_t *sd_cdb_pool; 124 125static const char *sd_cache_types[] = { 126 "write through", "none", "write back", 127 "write back, no read (daft)" 128}; 129 130static ssize_t 131sd_store_cache_type(struct device *dev, struct device_attribute *attr, 132 const char *buf, size_t count) 133{ 134 int i, ct = -1, rcd, wce, sp; 135 struct scsi_disk *sdkp = to_scsi_disk(dev); 136 struct scsi_device *sdp = sdkp->device; 137 char buffer[64]; 138 char *buffer_data; 139 struct scsi_mode_data data; 140 struct scsi_sense_hdr sshdr; 141 int len; 142 143 if (sdp->type != TYPE_DISK) 144 /* no cache control on RBC devices; theoretically they 145 * can do it, but there's probably so many exceptions 146 * it's not worth the risk */ 147 return -EINVAL; 148 149 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 150 len = strlen(sd_cache_types[i]); 151 if (strncmp(sd_cache_types[i], buf, len) == 0 && 152 buf[len] == '\n') { 153 ct = i; 154 break; 155 } 156 } 157 if (ct < 0) 158 return -EINVAL; 159 rcd = ct & 0x01 ? 1 : 0; 160 wce = ct & 0x02 ? 1 : 0; 161 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 162 SD_MAX_RETRIES, &data, NULL)) 163 return -EINVAL; 164 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 165 data.block_descriptor_length); 166 buffer_data = buffer + data.header_length + 167 data.block_descriptor_length; 168 buffer_data[2] &= ~0x05; 169 buffer_data[2] |= wce << 2 | rcd; 170 sp = buffer_data[0] & 0x80 ? 1 : 0; 171 172 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 173 SD_MAX_RETRIES, &data, &sshdr)) { 174 if (scsi_sense_valid(&sshdr)) 175 sd_print_sense_hdr(sdkp, &sshdr); 176 return -EINVAL; 177 } 178 revalidate_disk(sdkp->disk); 179 return count; 180} 181 182static ssize_t 183sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, 184 const char *buf, size_t count) 185{ 186 struct scsi_disk *sdkp = to_scsi_disk(dev); 187 struct scsi_device *sdp = sdkp->device; 188 189 if (!capable(CAP_SYS_ADMIN)) 190 return -EACCES; 191 192 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 193 194 return count; 195} 196 197static ssize_t 198sd_store_allow_restart(struct device *dev, struct device_attribute *attr, 199 const char *buf, size_t count) 200{ 201 struct scsi_disk *sdkp = to_scsi_disk(dev); 202 struct scsi_device *sdp = sdkp->device; 203 204 if (!capable(CAP_SYS_ADMIN)) 205 return -EACCES; 206 207 if (sdp->type != TYPE_DISK) 208 return -EINVAL; 209 210 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 211 212 return count; 213} 214 215static ssize_t 216sd_show_cache_type(struct device *dev, struct device_attribute *attr, 217 char *buf) 218{ 219 struct scsi_disk *sdkp = to_scsi_disk(dev); 220 int ct = sdkp->RCD + 2*sdkp->WCE; 221 222 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); 223} 224 225static ssize_t 226sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) 227{ 228 struct scsi_disk *sdkp = to_scsi_disk(dev); 229 230 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); 231} 232 233static ssize_t 234sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, 235 char *buf) 236{ 237 struct scsi_disk *sdkp = to_scsi_disk(dev); 238 struct scsi_device *sdp = sdkp->device; 239 240 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); 241} 242 243static ssize_t 244sd_show_allow_restart(struct device *dev, struct device_attribute *attr, 245 char *buf) 246{ 247 struct scsi_disk *sdkp = to_scsi_disk(dev); 248 249 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); 250} 251 252static ssize_t 253sd_show_protection_type(struct device *dev, struct device_attribute *attr, 254 char *buf) 255{ 256 struct scsi_disk *sdkp = to_scsi_disk(dev); 257 258 return snprintf(buf, 20, "%u\n", sdkp->protection_type); 259} 260 261static ssize_t 262sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, 263 char *buf) 264{ 265 struct scsi_disk *sdkp = to_scsi_disk(dev); 266 267 return snprintf(buf, 20, "%u\n", sdkp->ATO); 268} 269 270static ssize_t 271sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr, 272 char *buf) 273{ 274 struct scsi_disk *sdkp = to_scsi_disk(dev); 275 276 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning); 277} 278 279static struct device_attribute sd_disk_attrs[] = { 280 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, 281 sd_store_cache_type), 282 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), 283 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, 284 sd_store_allow_restart), 285 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, 286 sd_store_manage_start_stop), 287 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), 288 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), 289 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL), 290 __ATTR_NULL, 291}; 292 293static struct class sd_disk_class = { 294 .name = "scsi_disk", 295 .owner = THIS_MODULE, 296 .dev_release = scsi_disk_release, 297 .dev_attrs = sd_disk_attrs, 298}; 299 300static struct scsi_driver sd_template = { 301 .owner = THIS_MODULE, 302 .gendrv = { 303 .name = "sd", 304 .probe = sd_probe, 305 .remove = sd_remove, 306 .suspend = sd_suspend, 307 .resume = sd_resume, 308 .shutdown = sd_shutdown, 309 }, 310 .rescan = sd_rescan, 311 .done = sd_done, 312}; 313 314/* 315 * Device no to disk mapping: 316 * 317 * major disc2 disc p1 318 * |............|.............|....|....| <- dev_t 319 * 31 20 19 8 7 4 3 0 320 * 321 * Inside a major, we have 16k disks, however mapped non- 322 * contiguously. The first 16 disks are for major0, the next 323 * ones with major1, ... Disk 256 is for major0 again, disk 272 324 * for major1, ... 325 * As we stay compatible with our numbering scheme, we can reuse 326 * the well-know SCSI majors 8, 65--71, 136--143. 327 */ 328static int sd_major(int major_idx) 329{ 330 switch (major_idx) { 331 case 0: 332 return SCSI_DISK0_MAJOR; 333 case 1 ... 7: 334 return SCSI_DISK1_MAJOR + major_idx - 1; 335 case 8 ... 15: 336 return SCSI_DISK8_MAJOR + major_idx - 8; 337 default: 338 BUG(); 339 return 0; /* shut up gcc */ 340 } 341} 342 343static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) 344{ 345 struct scsi_disk *sdkp = NULL; 346 347 if (disk->private_data) { 348 sdkp = scsi_disk(disk); 349 if (scsi_device_get(sdkp->device) == 0) 350 get_device(&sdkp->dev); 351 else 352 sdkp = NULL; 353 } 354 return sdkp; 355} 356 357static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 358{ 359 struct scsi_disk *sdkp; 360 361 mutex_lock(&sd_ref_mutex); 362 sdkp = __scsi_disk_get(disk); 363 mutex_unlock(&sd_ref_mutex); 364 return sdkp; 365} 366 367static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) 368{ 369 struct scsi_disk *sdkp; 370 371 mutex_lock(&sd_ref_mutex); 372 sdkp = dev_get_drvdata(dev); 373 if (sdkp) 374 sdkp = __scsi_disk_get(sdkp->disk); 375 mutex_unlock(&sd_ref_mutex); 376 return sdkp; 377} 378 379static void scsi_disk_put(struct scsi_disk *sdkp) 380{ 381 struct scsi_device *sdev = sdkp->device; 382 383 mutex_lock(&sd_ref_mutex); 384 put_device(&sdkp->dev); 385 scsi_device_put(sdev); 386 mutex_unlock(&sd_ref_mutex); 387} 388 389static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif) 390{ 391 unsigned int prot_op = SCSI_PROT_NORMAL; 392 unsigned int dix = scsi_prot_sg_count(scmd); 393 394 if (scmd->sc_data_direction == DMA_FROM_DEVICE) { 395 if (dif && dix) 396 prot_op = SCSI_PROT_READ_PASS; 397 else if (dif && !dix) 398 prot_op = SCSI_PROT_READ_STRIP; 399 else if (!dif && dix) 400 prot_op = SCSI_PROT_READ_INSERT; 401 } else { 402 if (dif && dix) 403 prot_op = SCSI_PROT_WRITE_PASS; 404 else if (dif && !dix) 405 prot_op = SCSI_PROT_WRITE_INSERT; 406 else if (!dif && dix) 407 prot_op = SCSI_PROT_WRITE_STRIP; 408 } 409 410 scsi_set_prot_op(scmd, prot_op); 411 scsi_set_prot_type(scmd, dif); 412} 413 414/** 415 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device 416 * @sdp: scsi device to operate one 417 * @rq: Request to prepare 418 * 419 * Will issue either UNMAP or WRITE SAME(16) depending on preference 420 * indicated by target device. 421 **/ 422static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq) 423{ 424 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 425 struct bio *bio = rq->bio; 426 sector_t sector = bio->bi_sector; 427 unsigned int nr_sectors = bio_sectors(bio); 428 unsigned int len; 429 int ret; 430 struct page *page; 431 432 if (sdkp->device->sector_size == 4096) { 433 sector >>= 3; 434 nr_sectors >>= 3; 435 } 436 437 rq->timeout = SD_TIMEOUT; 438 439 memset(rq->cmd, 0, rq->cmd_len); 440 441 page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 442 if (!page) 443 return BLKPREP_DEFER; 444 445 if (sdkp->unmap) { 446 char *buf = page_address(page); 447 448 rq->cmd_len = 10; 449 rq->cmd[0] = UNMAP; 450 rq->cmd[8] = 24; 451 452 put_unaligned_be16(6 + 16, &buf[0]); 453 put_unaligned_be16(16, &buf[2]); 454 put_unaligned_be64(sector, &buf[8]); 455 put_unaligned_be32(nr_sectors, &buf[16]); 456 457 len = 24; 458 } else { 459 rq->cmd_len = 16; 460 rq->cmd[0] = WRITE_SAME_16; 461 rq->cmd[1] = 0x8; /* UNMAP */ 462 put_unaligned_be64(sector, &rq->cmd[2]); 463 put_unaligned_be32(nr_sectors, &rq->cmd[10]); 464 465 len = sdkp->device->sector_size; 466 } 467 468 blk_add_request_payload(rq, page, len); 469 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 470 rq->buffer = page_address(page); 471 if (ret != BLKPREP_OK) { 472 __free_page(page); 473 rq->buffer = NULL; 474 } 475 return ret; 476} 477 478static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq) 479{ 480 rq->timeout = SD_TIMEOUT; 481 rq->retries = SD_MAX_RETRIES; 482 rq->cmd[0] = SYNCHRONIZE_CACHE; 483 rq->cmd_len = 10; 484 485 return scsi_setup_blk_pc_cmnd(sdp, rq); 486} 487 488static void sd_unprep_fn(struct request_queue *q, struct request *rq) 489{ 490 if (rq->cmd_flags & REQ_DISCARD) { 491 free_page((unsigned long)rq->buffer); 492 rq->buffer = NULL; 493 } 494} 495 496/** 497 * sd_init_command - build a scsi (read or write) command from 498 * information in the request structure. 499 * @SCpnt: pointer to mid-level's per scsi command structure that 500 * contains request and into which the scsi command is written 501 * 502 * Returns 1 if successful and 0 if error (or cannot be done now). 503 **/ 504static int sd_prep_fn(struct request_queue *q, struct request *rq) 505{ 506 struct scsi_cmnd *SCpnt; 507 struct scsi_device *sdp = q->queuedata; 508 struct gendisk *disk = rq->rq_disk; 509 struct scsi_disk *sdkp; 510 sector_t block = blk_rq_pos(rq); 511 sector_t threshold; 512 unsigned int this_count = blk_rq_sectors(rq); 513 int ret, host_dif; 514 unsigned char protect; 515 516 /* 517 * Discard request come in as REQ_TYPE_FS but we turn them into 518 * block PC requests to make life easier. 519 */ 520 if (rq->cmd_flags & REQ_DISCARD) { 521 ret = scsi_setup_discard_cmnd(sdp, rq); 522 goto out; 523 } else if (rq->cmd_flags & REQ_FLUSH) { 524 ret = scsi_setup_flush_cmnd(sdp, rq); 525 goto out; 526 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 527 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 528 goto out; 529 } else if (rq->cmd_type != REQ_TYPE_FS) { 530 ret = BLKPREP_KILL; 531 goto out; 532 } 533 ret = scsi_setup_fs_cmnd(sdp, rq); 534 if (ret != BLKPREP_OK) 535 goto out; 536 SCpnt = rq->special; 537 sdkp = scsi_disk(disk); 538 539 /* from here on until we're complete, any goto out 540 * is used for a killable error condition */ 541 ret = BLKPREP_KILL; 542 543 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 544 "sd_init_command: block=%llu, " 545 "count=%d\n", 546 (unsigned long long)block, 547 this_count)); 548 549 if (!sdp || !scsi_device_online(sdp) || 550 block + blk_rq_sectors(rq) > get_capacity(disk)) { 551 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 552 "Finishing %u sectors\n", 553 blk_rq_sectors(rq))); 554 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 555 "Retry with 0x%p\n", SCpnt)); 556 goto out; 557 } 558 559 if (sdp->changed) { 560 /* 561 * quietly refuse to do anything to a changed disc until 562 * the changed bit has been reset 563 */ 564 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ 565 goto out; 566 } 567 568 /* 569 * Some SD card readers can't handle multi-sector accesses which touch 570 * the last one or two hardware sectors. Split accesses as needed. 571 */ 572 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 573 (sdp->sector_size / 512); 574 575 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 576 if (block < threshold) { 577 /* Access up to the threshold but not beyond */ 578 this_count = threshold - block; 579 } else { 580 /* Access only a single hardware sector */ 581 this_count = sdp->sector_size / 512; 582 } 583 } 584 585 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 586 (unsigned long long)block)); 587 588 /* 589 * If we have a 1K hardware sectorsize, prevent access to single 590 * 512 byte sectors. In theory we could handle this - in fact 591 * the scsi cdrom driver must be able to handle this because 592 * we typically use 1K blocksizes, and cdroms typically have 593 * 2K hardware sectorsizes. Of course, things are simpler 594 * with the cdrom, since it is read-only. For performance 595 * reasons, the filesystems should be able to handle this 596 * and not force the scsi disk driver to use bounce buffers 597 * for this. 598 */ 599 if (sdp->sector_size == 1024) { 600 if ((block & 1) || (blk_rq_sectors(rq) & 1)) { 601 scmd_printk(KERN_ERR, SCpnt, 602 "Bad block number requested\n"); 603 goto out; 604 } else { 605 block = block >> 1; 606 this_count = this_count >> 1; 607 } 608 } 609 if (sdp->sector_size == 2048) { 610 if ((block & 3) || (blk_rq_sectors(rq) & 3)) { 611 scmd_printk(KERN_ERR, SCpnt, 612 "Bad block number requested\n"); 613 goto out; 614 } else { 615 block = block >> 2; 616 this_count = this_count >> 2; 617 } 618 } 619 if (sdp->sector_size == 4096) { 620 if ((block & 7) || (blk_rq_sectors(rq) & 7)) { 621 scmd_printk(KERN_ERR, SCpnt, 622 "Bad block number requested\n"); 623 goto out; 624 } else { 625 block = block >> 3; 626 this_count = this_count >> 3; 627 } 628 } 629 if (rq_data_dir(rq) == WRITE) { 630 if (!sdp->writeable) { 631 goto out; 632 } 633 SCpnt->cmnd[0] = WRITE_6; 634 SCpnt->sc_data_direction = DMA_TO_DEVICE; 635 636 if (blk_integrity_rq(rq) && 637 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO) 638 goto out; 639 640 } else if (rq_data_dir(rq) == READ) { 641 SCpnt->cmnd[0] = READ_6; 642 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 643 } else { 644 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); 645 goto out; 646 } 647 648 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 649 "%s %d/%u 512 byte blocks.\n", 650 (rq_data_dir(rq) == WRITE) ? 651 "writing" : "reading", this_count, 652 blk_rq_sectors(rq))); 653 654 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ 655 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 656 if (host_dif) 657 protect = 1 << 5; 658 else 659 protect = 0; 660 661 if (host_dif == SD_DIF_TYPE2_PROTECTION) { 662 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); 663 664 if (unlikely(SCpnt->cmnd == NULL)) { 665 ret = BLKPREP_DEFER; 666 goto out; 667 } 668 669 SCpnt->cmd_len = SD_EXT_CDB_SIZE; 670 memset(SCpnt->cmnd, 0, SCpnt->cmd_len); 671 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; 672 SCpnt->cmnd[7] = 0x18; 673 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; 674 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 675 676 /* LBA */ 677 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 678 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 679 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 680 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 681 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; 682 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; 683 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; 684 SCpnt->cmnd[19] = (unsigned char) block & 0xff; 685 686 /* Expected Indirect LBA */ 687 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; 688 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; 689 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; 690 SCpnt->cmnd[23] = (unsigned char) block & 0xff; 691 692 /* Transfer length */ 693 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; 694 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; 695 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; 696 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; 697 } else if (sdp->use_16_for_rw) { 698 SCpnt->cmnd[0] += READ_16 - READ_6; 699 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 700 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 701 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 702 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 703 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 704 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 705 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 706 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 707 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 708 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 709 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 710 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 711 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 712 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 713 } else if ((this_count > 0xff) || (block > 0x1fffff) || 714 scsi_device_protection(SCpnt->device) || 715 SCpnt->device->use_10_for_rw) { 716 if (this_count > 0xffff) 717 this_count = 0xffff; 718 719 SCpnt->cmnd[0] += READ_10 - READ_6; 720 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 721 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 722 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 723 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 724 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 725 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 726 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 727 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 728 } else { 729 if (unlikely(rq->cmd_flags & REQ_FUA)) { 730 /* 731 * This happens only if this drive failed 732 * 10byte rw command with ILLEGAL_REQUEST 733 * during operation and thus turned off 734 * use_10_for_rw. 735 */ 736 scmd_printk(KERN_ERR, SCpnt, 737 "FUA write on READ/WRITE(6) drive\n"); 738 goto out; 739 } 740 741 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 742 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 743 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 744 SCpnt->cmnd[4] = (unsigned char) this_count; 745 SCpnt->cmnd[5] = 0; 746 } 747 SCpnt->sdb.length = this_count * sdp->sector_size; 748 749 /* If DIF or DIX is enabled, tell HBA how to handle request */ 750 if (host_dif || scsi_prot_sg_count(SCpnt)) 751 sd_prot_op(SCpnt, host_dif); 752 753 /* 754 * We shouldn't disconnect in the middle of a sector, so with a dumb 755 * host adapter, it's safe to assume that we can at least transfer 756 * this many bytes between each connect / disconnect. 757 */ 758 SCpnt->transfersize = sdp->sector_size; 759 SCpnt->underflow = this_count << 9; 760 SCpnt->allowed = SD_MAX_RETRIES; 761 762 /* 763 * This indicates that the command is ready from our end to be 764 * queued. 765 */ 766 ret = BLKPREP_OK; 767 out: 768 return scsi_prep_return(q, rq, ret); 769} 770 771/** 772 * sd_open - open a scsi disk device 773 * @inode: only i_rdev member may be used 774 * @filp: only f_mode and f_flags may be used 775 * 776 * Returns 0 if successful. Returns a negated errno value in case 777 * of error. 778 * 779 * Note: This can be called from a user context (e.g. fsck(1) ) 780 * or from within the kernel (e.g. as a result of a mount(1) ). 781 * In the latter case @inode and @filp carry an abridged amount 782 * of information as noted above. 783 * 784 * Locking: called with bdev->bd_mutex held. 785 **/ 786static int sd_open(struct block_device *bdev, fmode_t mode) 787{ 788 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 789 struct scsi_device *sdev; 790 int retval; 791 792 if (!sdkp) 793 return -ENXIO; 794 795 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 796 797 sdev = sdkp->device; 798 799 retval = scsi_autopm_get_device(sdev); 800 if (retval) 801 goto error_autopm; 802 803 /* 804 * If the device is in error recovery, wait until it is done. 805 * If the device is offline, then disallow any access to it. 806 */ 807 retval = -ENXIO; 808 if (!scsi_block_when_processing_errors(sdev)) 809 goto error_out; 810 811 if (sdev->removable || sdkp->write_prot) 812 check_disk_change(bdev); 813 814 /* 815 * If the drive is empty, just let the open fail. 816 */ 817 retval = -ENOMEDIUM; 818 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 819 goto error_out; 820 821 /* 822 * If the device has the write protect tab set, have the open fail 823 * if the user expects to be able to write to the thing. 824 */ 825 retval = -EROFS; 826 if (sdkp->write_prot && (mode & FMODE_WRITE)) 827 goto error_out; 828 829 /* 830 * It is possible that the disk changing stuff resulted in 831 * the device being taken offline. If this is the case, 832 * report this to the user, and don't pretend that the 833 * open actually succeeded. 834 */ 835 retval = -ENXIO; 836 if (!scsi_device_online(sdev)) 837 goto error_out; 838 839 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { 840 if (scsi_block_when_processing_errors(sdev)) 841 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 842 } 843 844 return 0; 845 846error_out: 847 scsi_autopm_put_device(sdev); 848error_autopm: 849 scsi_disk_put(sdkp); 850 return retval; 851} 852 853/** 854 * sd_release - invoked when the (last) close(2) is called on this 855 * scsi disk. 856 * @inode: only i_rdev member may be used 857 * @filp: only f_mode and f_flags may be used 858 * 859 * Returns 0. 860 * 861 * Note: may block (uninterruptible) if error recovery is underway 862 * on this disk. 863 * 864 * Locking: called with bdev->bd_mutex held. 865 **/ 866static int sd_release(struct gendisk *disk, fmode_t mode) 867{ 868 struct scsi_disk *sdkp = scsi_disk(disk); 869 struct scsi_device *sdev = sdkp->device; 870 871 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 872 873 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) { 874 if (scsi_block_when_processing_errors(sdev)) 875 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 876 } 877 878 879 scsi_autopm_put_device(sdev); 880 scsi_disk_put(sdkp); 881 return 0; 882} 883 884static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 885{ 886 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 887 struct scsi_device *sdp = sdkp->device; 888 struct Scsi_Host *host = sdp->host; 889 int diskinfo[4]; 890 891 /* default to most commonly used values */ 892 diskinfo[0] = 0x40; /* 1 << 6 */ 893 diskinfo[1] = 0x20; /* 1 << 5 */ 894 diskinfo[2] = sdkp->capacity >> 11; 895 896 /* override with calculated, extended default, or driver values */ 897 if (host->hostt->bios_param) 898 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 899 else 900 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 901 902 geo->heads = diskinfo[0]; 903 geo->sectors = diskinfo[1]; 904 geo->cylinders = diskinfo[2]; 905 return 0; 906} 907 908/** 909 * sd_ioctl - process an ioctl 910 * @inode: only i_rdev/i_bdev members may be used 911 * @filp: only f_mode and f_flags may be used 912 * @cmd: ioctl command number 913 * @arg: this is third argument given to ioctl(2) system call. 914 * Often contains a pointer. 915 * 916 * Returns 0 if successful (some ioctls return postive numbers on 917 * success as well). Returns a negated errno value in case of error. 918 * 919 * Note: most ioctls are forward onto the block subsystem or further 920 * down in the scsi subsystem. 921 **/ 922static int sd_ioctl(struct block_device *bdev, fmode_t mode, 923 unsigned int cmd, unsigned long arg) 924{ 925 struct gendisk *disk = bdev->bd_disk; 926 struct scsi_device *sdp = scsi_disk(disk)->device; 927 void __user *p = (void __user *)arg; 928 int error; 929 930 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", 931 disk->disk_name, cmd)); 932 933 /* 934 * If we are in the middle of error recovery, don't let anyone 935 * else try and use this device. Also, if error recovery fails, it 936 * may try and take the device offline, in which case all further 937 * access to the device is prohibited. 938 */ 939 error = scsi_nonblockable_ioctl(sdp, cmd, p, 940 (mode & FMODE_NDELAY) != 0); 941 if (!scsi_block_when_processing_errors(sdp) || !error) 942 goto out; 943 944 /* 945 * Send SCSI addressing ioctls directly to mid level, send other 946 * ioctls to block level and then onto mid level if they can't be 947 * resolved. 948 */ 949 switch (cmd) { 950 case SCSI_IOCTL_GET_IDLUN: 951 case SCSI_IOCTL_GET_BUS_NUMBER: 952 error = scsi_ioctl(sdp, cmd, p); 953 break; 954 default: 955 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p); 956 if (error != -ENOTTY) 957 break; 958 error = scsi_ioctl(sdp, cmd, p); 959 break; 960 } 961out: 962 return error; 963} 964 965static void set_media_not_present(struct scsi_disk *sdkp) 966{ 967 sdkp->media_present = 0; 968 sdkp->capacity = 0; 969 sdkp->device->changed = 1; 970} 971 972/** 973 * sd_media_changed - check if our medium changed 974 * @disk: kernel device descriptor 975 * 976 * Returns 0 if not applicable or no change; 1 if change 977 * 978 * Note: this function is invoked from the block subsystem. 979 **/ 980static int sd_media_changed(struct gendisk *disk) 981{ 982 struct scsi_disk *sdkp = scsi_disk(disk); 983 struct scsi_device *sdp = sdkp->device; 984 struct scsi_sense_hdr *sshdr = NULL; 985 int retval; 986 987 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); 988 989 if (!sdp->removable) 990 return 0; 991 992 /* 993 * If the device is offline, don't send any commands - just pretend as 994 * if the command failed. If the device ever comes back online, we 995 * can deal with it then. It is only because of unrecoverable errors 996 * that we would ever take a device offline in the first place. 997 */ 998 if (!scsi_device_online(sdp)) { 999 set_media_not_present(sdkp); 1000 retval = 1; 1001 goto out; 1002 } 1003 1004 /* 1005 * Using TEST_UNIT_READY enables differentiation between drive with 1006 * no cartridge loaded - NOT READY, drive with changed cartridge - 1007 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 1008 * 1009 * Drives that auto spin down. eg iomega jaz 1G, will be started 1010 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 1011 * sd_revalidate() is called. 1012 */ 1013 retval = -ENODEV; 1014 1015 if (scsi_block_when_processing_errors(sdp)) { 1016 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 1017 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 1018 sshdr); 1019 } 1020 1021 /* 1022 * Unable to test, unit probably not ready. This usually 1023 * means there is no disc in the drive. Mark as changed, 1024 * and we will figure it out later once the drive is 1025 * available again. 1026 */ 1027 if (retval || (scsi_sense_valid(sshdr) && 1028 /* 0x3a is medium not present */ 1029 sshdr->asc == 0x3a)) { 1030 set_media_not_present(sdkp); 1031 retval = 1; 1032 goto out; 1033 } 1034 1035 /* 1036 * For removable scsi disk we have to recognise the presence 1037 * of a disk in the drive. This is kept in the struct scsi_disk 1038 * struct and tested at open ! Daniel Roche (dan@lectra.fr) 1039 */ 1040 sdkp->media_present = 1; 1041 1042 retval = sdp->changed; 1043 sdp->changed = 0; 1044out: 1045 if (retval != sdkp->previous_state) 1046 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL); 1047 sdkp->previous_state = retval; 1048 kfree(sshdr); 1049 return retval; 1050} 1051 1052static int sd_sync_cache(struct scsi_disk *sdkp) 1053{ 1054 int retries, res; 1055 struct scsi_device *sdp = sdkp->device; 1056 struct scsi_sense_hdr sshdr; 1057 1058 if (!scsi_device_online(sdp)) 1059 return -ENODEV; 1060 1061 1062 for (retries = 3; retries > 0; --retries) { 1063 unsigned char cmd[10] = { 0 }; 1064 1065 cmd[0] = SYNCHRONIZE_CACHE; 1066 /* 1067 * Leave the rest of the command zero to indicate 1068 * flush everything. 1069 */ 1070 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 1071 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1072 if (res == 0) 1073 break; 1074 } 1075 1076 if (res) { 1077 sd_print_result(sdkp, res); 1078 if (driver_byte(res) & DRIVER_SENSE) 1079 sd_print_sense_hdr(sdkp, &sshdr); 1080 } 1081 1082 if (res) 1083 return -EIO; 1084 return 0; 1085} 1086 1087static void sd_rescan(struct device *dev) 1088{ 1089 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1090 1091 if (sdkp) { 1092 revalidate_disk(sdkp->disk); 1093 scsi_disk_put(sdkp); 1094 } 1095} 1096 1097 1098#ifdef CONFIG_COMPAT 1099/* 1100 * This gets directly called from VFS. When the ioctl 1101 * is not recognized we go back to the other translation paths. 1102 */ 1103static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1104 unsigned int cmd, unsigned long arg) 1105{ 1106 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1107 1108 /* 1109 * If we are in the middle of error recovery, don't let anyone 1110 * else try and use this device. Also, if error recovery fails, it 1111 * may try and take the device offline, in which case all further 1112 * access to the device is prohibited. 1113 */ 1114 if (!scsi_block_when_processing_errors(sdev)) 1115 return -ENODEV; 1116 1117 if (sdev->host->hostt->compat_ioctl) { 1118 int ret; 1119 1120 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1121 1122 return ret; 1123 } 1124 1125 /* 1126 * Let the static ioctl translation table take care of it. 1127 */ 1128 return -ENOIOCTLCMD; 1129} 1130#endif 1131 1132static const struct block_device_operations sd_fops = { 1133 .owner = THIS_MODULE, 1134 .open = sd_open, 1135 .release = sd_release, 1136 .ioctl = sd_ioctl, 1137 .getgeo = sd_getgeo, 1138#ifdef CONFIG_COMPAT 1139 .compat_ioctl = sd_compat_ioctl, 1140#endif 1141 .media_changed = sd_media_changed, 1142 .revalidate_disk = sd_revalidate_disk, 1143 .unlock_native_capacity = sd_unlock_native_capacity, 1144}; 1145 1146static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1147{ 1148 u64 start_lba = blk_rq_pos(scmd->request); 1149 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); 1150 u64 bad_lba; 1151 int info_valid; 1152 /* 1153 * resid is optional but mostly filled in. When it's unused, 1154 * its value is zero, so we assume the whole buffer transferred 1155 */ 1156 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); 1157 unsigned int good_bytes; 1158 1159 if (scmd->request->cmd_type != REQ_TYPE_FS) 1160 return 0; 1161 1162 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 1163 SCSI_SENSE_BUFFERSIZE, 1164 &bad_lba); 1165 if (!info_valid) 1166 return 0; 1167 1168 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 1169 return 0; 1170 1171 if (scmd->device->sector_size < 512) { 1172 /* only legitimate sector_size here is 256 */ 1173 start_lba <<= 1; 1174 end_lba <<= 1; 1175 } else { 1176 /* be careful ... don't want any overflows */ 1177 u64 factor = scmd->device->sector_size / 512; 1178 do_div(start_lba, factor); 1179 do_div(end_lba, factor); 1180 } 1181 1182 /* The bad lba was reported incorrectly, we have no idea where 1183 * the error is. 1184 */ 1185 if (bad_lba < start_lba || bad_lba >= end_lba) 1186 return 0; 1187 1188 /* This computation should always be done in terms of 1189 * the resolution of the device's medium. 1190 */ 1191 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size; 1192 return min(good_bytes, transferred); 1193} 1194 1195/** 1196 * sd_done - bottom half handler: called when the lower level 1197 * driver has completed (successfully or otherwise) a scsi command. 1198 * @SCpnt: mid-level's per command structure. 1199 * 1200 * Note: potentially run from within an ISR. Must not block. 1201 **/ 1202static int sd_done(struct scsi_cmnd *SCpnt) 1203{ 1204 int result = SCpnt->result; 1205 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1206 struct scsi_sense_hdr sshdr; 1207 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1208 int sense_valid = 0; 1209 int sense_deferred = 0; 1210 1211 if (SCpnt->request->cmd_flags & REQ_DISCARD) { 1212 if (!result) 1213 scsi_set_resid(SCpnt, 0); 1214 return good_bytes; 1215 } 1216 1217 if (result) { 1218 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1219 if (sense_valid) 1220 sense_deferred = scsi_sense_is_deferred(&sshdr); 1221 } 1222#ifdef CONFIG_SCSI_LOGGING 1223 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 1224 if (sense_valid) { 1225 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1226 "sd_done: sb[respc,sk,asc," 1227 "ascq]=%x,%x,%x,%x\n", 1228 sshdr.response_code, 1229 sshdr.sense_key, sshdr.asc, 1230 sshdr.ascq)); 1231 } 1232#endif 1233 if (driver_byte(result) != DRIVER_SENSE && 1234 (!sense_valid || sense_deferred)) 1235 goto out; 1236 1237 switch (sshdr.sense_key) { 1238 case HARDWARE_ERROR: 1239 case MEDIUM_ERROR: 1240 good_bytes = sd_completed_bytes(SCpnt); 1241 break; 1242 case RECOVERED_ERROR: 1243 good_bytes = scsi_bufflen(SCpnt); 1244 break; 1245 case NO_SENSE: 1246 /* This indicates a false check condition, so ignore it. An 1247 * unknown amount of data was transferred so treat it as an 1248 * error. 1249 */ 1250 scsi_print_sense("sd", SCpnt); 1251 SCpnt->result = 0; 1252 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1253 break; 1254 case ABORTED_COMMAND: /* DIF: Target detected corruption */ 1255 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */ 1256 if (sshdr.asc == 0x10) 1257 good_bytes = sd_completed_bytes(SCpnt); 1258 break; 1259 default: 1260 break; 1261 } 1262 out: 1263 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1264 sd_dif_complete(SCpnt, good_bytes); 1265 1266 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type) 1267 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) { 1268 1269 /* We have to print a failed command here as the 1270 * extended CDB gets freed before scsi_io_completion() 1271 * is called. 1272 */ 1273 if (result) 1274 scsi_print_command(SCpnt); 1275 1276 mempool_free(SCpnt->cmnd, sd_cdb_pool); 1277 SCpnt->cmnd = NULL; 1278 SCpnt->cmd_len = 0; 1279 } 1280 1281 return good_bytes; 1282} 1283 1284static int media_not_present(struct scsi_disk *sdkp, 1285 struct scsi_sense_hdr *sshdr) 1286{ 1287 1288 if (!scsi_sense_valid(sshdr)) 1289 return 0; 1290 /* not invoked for commands that could return deferred errors */ 1291 if (sshdr->sense_key != NOT_READY && 1292 sshdr->sense_key != UNIT_ATTENTION) 1293 return 0; 1294 if (sshdr->asc != 0x3A) /* medium not present */ 1295 return 0; 1296 1297 set_media_not_present(sdkp); 1298 return 1; 1299} 1300 1301/* 1302 * spinup disk - called only in sd_revalidate_disk() 1303 */ 1304static void 1305sd_spinup_disk(struct scsi_disk *sdkp) 1306{ 1307 unsigned char cmd[10]; 1308 unsigned long spintime_expire = 0; 1309 int retries, spintime; 1310 unsigned int the_result; 1311 struct scsi_sense_hdr sshdr; 1312 int sense_valid = 0; 1313 1314 spintime = 0; 1315 1316 /* Spin up drives, as required. Only do this at boot time */ 1317 /* Spinup needs to be done for module loads too. */ 1318 do { 1319 retries = 0; 1320 1321 do { 1322 cmd[0] = TEST_UNIT_READY; 1323 memset((void *) &cmd[1], 0, 9); 1324 1325 the_result = scsi_execute_req(sdkp->device, cmd, 1326 DMA_NONE, NULL, 0, 1327 &sshdr, SD_TIMEOUT, 1328 SD_MAX_RETRIES, NULL); 1329 1330 /* 1331 * If the drive has indicated to us that it 1332 * doesn't have any media in it, don't bother 1333 * with any more polling. 1334 */ 1335 if (media_not_present(sdkp, &sshdr)) 1336 return; 1337 1338 if (the_result) 1339 sense_valid = scsi_sense_valid(&sshdr); 1340 retries++; 1341 } while (retries < 3 && 1342 (!scsi_status_is_good(the_result) || 1343 ((driver_byte(the_result) & DRIVER_SENSE) && 1344 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1345 1346 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1347 /* no sense, TUR either succeeded or failed 1348 * with a status error */ 1349 if(!spintime && !scsi_status_is_good(the_result)) { 1350 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1351 sd_print_result(sdkp, the_result); 1352 } 1353 break; 1354 } 1355 1356 /* 1357 * The device does not want the automatic start to be issued. 1358 */ 1359 if (sdkp->device->no_start_on_add) 1360 break; 1361 1362 if (sense_valid && sshdr.sense_key == NOT_READY) { 1363 if (sshdr.asc == 4 && sshdr.ascq == 3) 1364 break; /* manual intervention required */ 1365 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 1366 break; /* standby */ 1367 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 1368 break; /* unavailable */ 1369 /* 1370 * Issue command to spin up drive when not ready 1371 */ 1372 if (!spintime) { 1373 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1374 cmd[0] = START_STOP; 1375 cmd[1] = 1; /* Return immediately */ 1376 memset((void *) &cmd[2], 0, 8); 1377 cmd[4] = 1; /* Start spin cycle */ 1378 if (sdkp->device->start_stop_pwr_cond) 1379 cmd[4] |= 1 << 4; 1380 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1381 NULL, 0, &sshdr, 1382 SD_TIMEOUT, SD_MAX_RETRIES, 1383 NULL); 1384 spintime_expire = jiffies + 100 * HZ; 1385 spintime = 1; 1386 } 1387 /* Wait 1 second for next try */ 1388 msleep(1000); 1389 printk("."); 1390 1391 /* 1392 * Wait for USB flash devices with slow firmware. 1393 * Yes, this sense key/ASC combination shouldn't 1394 * occur here. It's characteristic of these devices. 1395 */ 1396 } else if (sense_valid && 1397 sshdr.sense_key == UNIT_ATTENTION && 1398 sshdr.asc == 0x28) { 1399 if (!spintime) { 1400 spintime_expire = jiffies + 5 * HZ; 1401 spintime = 1; 1402 } 1403 /* Wait 1 second for next try */ 1404 msleep(1000); 1405 } else { 1406 /* we don't understand the sense code, so it's 1407 * probably pointless to loop */ 1408 if(!spintime) { 1409 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1410 sd_print_sense_hdr(sdkp, &sshdr); 1411 } 1412 break; 1413 } 1414 1415 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1416 1417 if (spintime) { 1418 if (scsi_status_is_good(the_result)) 1419 printk("ready\n"); 1420 else 1421 printk("not responding...\n"); 1422 } 1423} 1424 1425 1426/* 1427 * Determine whether disk supports Data Integrity Field. 1428 */ 1429static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1430{ 1431 struct scsi_device *sdp = sdkp->device; 1432 u8 type; 1433 1434 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1435 return; 1436 1437 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1438 1439 if (type == sdkp->protection_type || !sdkp->first_scan) 1440 return; 1441 1442 sdkp->protection_type = type; 1443 1444 if (type > SD_DIF_TYPE3_PROTECTION) { 1445 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \ 1446 "protection type %u. Disabling disk!\n", type); 1447 sdkp->capacity = 0; 1448 return; 1449 } 1450 1451 if (scsi_host_dif_capable(sdp->host, type)) 1452 sd_printk(KERN_NOTICE, sdkp, 1453 "Enabling DIF Type %u protection\n", type); 1454 else 1455 sd_printk(KERN_NOTICE, sdkp, 1456 "Disabling DIF Type %u protection\n", type); 1457} 1458 1459static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 1460 struct scsi_sense_hdr *sshdr, int sense_valid, 1461 int the_result) 1462{ 1463 sd_print_result(sdkp, the_result); 1464 if (driver_byte(the_result) & DRIVER_SENSE) 1465 sd_print_sense_hdr(sdkp, sshdr); 1466 else 1467 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1468 1469 /* 1470 * Set dirty bit for removable devices if not ready - 1471 * sometimes drives will not report this properly. 1472 */ 1473 if (sdp->removable && 1474 sense_valid && sshdr->sense_key == NOT_READY) 1475 sdp->changed = 1; 1476 1477 /* 1478 * We used to set media_present to 0 here to indicate no media 1479 * in the drive, but some drives fail read capacity even with 1480 * media present, so we can't do that. 1481 */ 1482 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1483} 1484 1485#define RC16_LEN 32 1486#if RC16_LEN > SD_BUF_SIZE 1487#error RC16_LEN must not be more than SD_BUF_SIZE 1488#endif 1489 1490#define READ_CAPACITY_RETRIES_ON_RESET 10 1491 1492static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 1493 unsigned char *buffer) 1494{ 1495 unsigned char cmd[16]; 1496 struct scsi_sense_hdr sshdr; 1497 int sense_valid = 0; 1498 int the_result; 1499 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1500 unsigned int alignment; 1501 unsigned long long lba; 1502 unsigned sector_size; 1503 1504 do { 1505 memset(cmd, 0, 16); 1506 cmd[0] = SERVICE_ACTION_IN; 1507 cmd[1] = SAI_READ_CAPACITY_16; 1508 cmd[13] = RC16_LEN; 1509 memset(buffer, 0, RC16_LEN); 1510 1511 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1512 buffer, RC16_LEN, &sshdr, 1513 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1514 1515 if (media_not_present(sdkp, &sshdr)) 1516 return -ENODEV; 1517 1518 if (the_result) { 1519 sense_valid = scsi_sense_valid(&sshdr); 1520 if (sense_valid && 1521 sshdr.sense_key == ILLEGAL_REQUEST && 1522 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 1523 sshdr.ascq == 0x00) 1524 /* Invalid Command Operation Code or 1525 * Invalid Field in CDB, just retry 1526 * silently with RC10 */ 1527 return -EINVAL; 1528 if (sense_valid && 1529 sshdr.sense_key == UNIT_ATTENTION && 1530 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1531 /* Device reset might occur several times, 1532 * give it one more chance */ 1533 if (--reset_retries > 0) 1534 continue; 1535 } 1536 retries--; 1537 1538 } while (the_result && retries); 1539 1540 if (the_result) { 1541 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1542 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1543 return -EINVAL; 1544 } 1545 1546 sector_size = get_unaligned_be32(&buffer[8]); 1547 lba = get_unaligned_be64(&buffer[0]); 1548 1549 sd_read_protection_type(sdkp, buffer); 1550 1551 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { 1552 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1553 "kernel compiled with support for large block " 1554 "devices.\n"); 1555 sdkp->capacity = 0; 1556 return -EOVERFLOW; 1557 } 1558 1559 /* Logical blocks per physical block exponent */ 1560 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size; 1561 1562 /* Lowest aligned logical block */ 1563 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 1564 blk_queue_alignment_offset(sdp->request_queue, alignment); 1565 if (alignment && sdkp->first_scan) 1566 sd_printk(KERN_NOTICE, sdkp, 1567 "physical block alignment offset: %u\n", alignment); 1568 1569 if (buffer[14] & 0x80) { /* TPE */ 1570 struct request_queue *q = sdp->request_queue; 1571 1572 sdkp->thin_provisioning = 1; 1573 q->limits.discard_granularity = sdkp->hw_sector_size; 1574 q->limits.max_discard_sectors = 0xffffffff; 1575 1576 if (buffer[14] & 0x40) /* TPRZ */ 1577 q->limits.discard_zeroes_data = 1; 1578 1579 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); 1580 } 1581 1582 sdkp->capacity = lba + 1; 1583 return sector_size; 1584} 1585 1586static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 1587 unsigned char *buffer) 1588{ 1589 unsigned char cmd[16]; 1590 struct scsi_sense_hdr sshdr; 1591 int sense_valid = 0; 1592 int the_result; 1593 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1594 sector_t lba; 1595 unsigned sector_size; 1596 1597 do { 1598 cmd[0] = READ_CAPACITY; 1599 memset(&cmd[1], 0, 9); 1600 memset(buffer, 0, 8); 1601 1602 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1603 buffer, 8, &sshdr, 1604 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1605 1606 if (media_not_present(sdkp, &sshdr)) 1607 return -ENODEV; 1608 1609 if (the_result) { 1610 sense_valid = scsi_sense_valid(&sshdr); 1611 if (sense_valid && 1612 sshdr.sense_key == UNIT_ATTENTION && 1613 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1614 /* Device reset might occur several times, 1615 * give it one more chance */ 1616 if (--reset_retries > 0) 1617 continue; 1618 } 1619 retries--; 1620 1621 } while (the_result && retries); 1622 1623 if (the_result) { 1624 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 1625 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1626 return -EINVAL; 1627 } 1628 1629 sector_size = get_unaligned_be32(&buffer[4]); 1630 lba = get_unaligned_be32(&buffer[0]); 1631 1632 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { 1633 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1634 "kernel compiled with support for large block " 1635 "devices.\n"); 1636 sdkp->capacity = 0; 1637 return -EOVERFLOW; 1638 } 1639 1640 sdkp->capacity = lba + 1; 1641 sdkp->hw_sector_size = sector_size; 1642 return sector_size; 1643} 1644 1645static int sd_try_rc16_first(struct scsi_device *sdp) 1646{ 1647 if (sdp->host->max_cmd_len < 16) 1648 return 0; 1649 if (sdp->scsi_level > SCSI_SPC_2) 1650 return 1; 1651 if (scsi_device_protection(sdp)) 1652 return 1; 1653 return 0; 1654} 1655 1656/* 1657 * read disk capacity 1658 */ 1659static void 1660sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 1661{ 1662 int sector_size; 1663 struct scsi_device *sdp = sdkp->device; 1664 sector_t old_capacity = sdkp->capacity; 1665 1666 if (sd_try_rc16_first(sdp)) { 1667 sector_size = read_capacity_16(sdkp, sdp, buffer); 1668 if (sector_size == -EOVERFLOW) 1669 goto got_data; 1670 if (sector_size == -ENODEV) 1671 return; 1672 if (sector_size < 0) 1673 sector_size = read_capacity_10(sdkp, sdp, buffer); 1674 if (sector_size < 0) 1675 return; 1676 } else { 1677 sector_size = read_capacity_10(sdkp, sdp, buffer); 1678 if (sector_size == -EOVERFLOW) 1679 goto got_data; 1680 if (sector_size < 0) 1681 return; 1682 if ((sizeof(sdkp->capacity) > 4) && 1683 (sdkp->capacity > 0xffffffffULL)) { 1684 int old_sector_size = sector_size; 1685 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 1686 "Trying to use READ CAPACITY(16).\n"); 1687 sector_size = read_capacity_16(sdkp, sdp, buffer); 1688 if (sector_size < 0) { 1689 sd_printk(KERN_NOTICE, sdkp, 1690 "Using 0xffffffff as device size\n"); 1691 sdkp->capacity = 1 + (sector_t) 0xffffffff; 1692 sector_size = old_sector_size; 1693 goto got_data; 1694 } 1695 } 1696 } 1697 1698 /* Some devices are known to return the total number of blocks, 1699 * not the highest block number. Some devices have versions 1700 * which do this and others which do not. Some devices we might 1701 * suspect of doing this but we don't know for certain. 1702 * 1703 * If we know the reported capacity is wrong, decrement it. If 1704 * we can only guess, then assume the number of blocks is even 1705 * (usually true but not always) and err on the side of lowering 1706 * the capacity. 1707 */ 1708 if (sdp->fix_capacity || 1709 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 1710 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 1711 "from its reported value: %llu\n", 1712 (unsigned long long) sdkp->capacity); 1713 --sdkp->capacity; 1714 } 1715 1716got_data: 1717 if (sector_size == 0) { 1718 sector_size = 512; 1719 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 1720 "assuming 512.\n"); 1721 } 1722 1723 if (sector_size != 512 && 1724 sector_size != 1024 && 1725 sector_size != 2048 && 1726 sector_size != 4096 && 1727 sector_size != 256) { 1728 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 1729 sector_size); 1730 /* 1731 * The user might want to re-format the drive with 1732 * a supported sectorsize. Once this happens, it 1733 * would be relatively trivial to set the thing up. 1734 * For this reason, we leave the thing in the table. 1735 */ 1736 sdkp->capacity = 0; 1737 /* 1738 * set a bogus sector size so the normal read/write 1739 * logic in the block layer will eventually refuse any 1740 * request on this device without tripping over power 1741 * of two sector size assumptions 1742 */ 1743 sector_size = 512; 1744 } 1745 blk_queue_logical_block_size(sdp->request_queue, sector_size); 1746 1747 { 1748 char cap_str_2[10], cap_str_10[10]; 1749 u64 sz = (u64)sdkp->capacity << ilog2(sector_size); 1750 1751 string_get_size(sz, STRING_UNITS_2, cap_str_2, 1752 sizeof(cap_str_2)); 1753 string_get_size(sz, STRING_UNITS_10, cap_str_10, 1754 sizeof(cap_str_10)); 1755 1756 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 1757 sd_printk(KERN_NOTICE, sdkp, 1758 "%llu %d-byte logical blocks: (%s/%s)\n", 1759 (unsigned long long)sdkp->capacity, 1760 sector_size, cap_str_10, cap_str_2); 1761 1762 if (sdkp->hw_sector_size != sector_size) 1763 sd_printk(KERN_NOTICE, sdkp, 1764 "%u-byte physical blocks\n", 1765 sdkp->hw_sector_size); 1766 } 1767 } 1768 1769 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff); 1770 1771 /* Rescale capacity to 512-byte units */ 1772 if (sector_size == 4096) 1773 sdkp->capacity <<= 3; 1774 else if (sector_size == 2048) 1775 sdkp->capacity <<= 2; 1776 else if (sector_size == 1024) 1777 sdkp->capacity <<= 1; 1778 else if (sector_size == 256) 1779 sdkp->capacity >>= 1; 1780 1781 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size); 1782 sdkp->device->sector_size = sector_size; 1783} 1784 1785/* called with buffer of length 512 */ 1786static inline int 1787sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 1788 unsigned char *buffer, int len, struct scsi_mode_data *data, 1789 struct scsi_sense_hdr *sshdr) 1790{ 1791 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 1792 SD_TIMEOUT, SD_MAX_RETRIES, data, 1793 sshdr); 1794} 1795 1796/* 1797 * read write protect setting, if possible - called only in sd_revalidate_disk() 1798 * called with buffer of length SD_BUF_SIZE 1799 */ 1800static void 1801sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 1802{ 1803 int res; 1804 struct scsi_device *sdp = sdkp->device; 1805 struct scsi_mode_data data; 1806 int old_wp = sdkp->write_prot; 1807 1808 set_disk_ro(sdkp->disk, 0); 1809 if (sdp->skip_ms_page_3f) { 1810 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 1811 return; 1812 } 1813 1814 if (sdp->use_192_bytes_for_3f) { 1815 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 1816 } else { 1817 /* 1818 * First attempt: ask for all pages (0x3F), but only 4 bytes. 1819 * We have to start carefully: some devices hang if we ask 1820 * for more than is available. 1821 */ 1822 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 1823 1824 /* 1825 * Second attempt: ask for page 0 When only page 0 is 1826 * implemented, a request for page 3F may return Sense Key 1827 * 5: Illegal Request, Sense Code 24: Invalid field in 1828 * CDB. 1829 */ 1830 if (!scsi_status_is_good(res)) 1831 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 1832 1833 /* 1834 * Third attempt: ask 255 bytes, as we did earlier. 1835 */ 1836 if (!scsi_status_is_good(res)) 1837 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 1838 &data, NULL); 1839 } 1840 1841 if (!scsi_status_is_good(res)) { 1842 sd_printk(KERN_WARNING, sdkp, 1843 "Test WP failed, assume Write Enabled\n"); 1844 } else { 1845 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 1846 set_disk_ro(sdkp->disk, sdkp->write_prot); 1847 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 1848 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 1849 sdkp->write_prot ? "on" : "off"); 1850 sd_printk(KERN_DEBUG, sdkp, 1851 "Mode Sense: %02x %02x %02x %02x\n", 1852 buffer[0], buffer[1], buffer[2], buffer[3]); 1853 } 1854 } 1855} 1856 1857/* 1858 * sd_read_cache_type - called only from sd_revalidate_disk() 1859 * called with buffer of length SD_BUF_SIZE 1860 */ 1861static void 1862sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 1863{ 1864 int len = 0, res; 1865 struct scsi_device *sdp = sdkp->device; 1866 1867 int dbd; 1868 int modepage; 1869 struct scsi_mode_data data; 1870 struct scsi_sense_hdr sshdr; 1871 int old_wce = sdkp->WCE; 1872 int old_rcd = sdkp->RCD; 1873 int old_dpofua = sdkp->DPOFUA; 1874 1875 if (sdp->skip_ms_page_8) 1876 goto defaults; 1877 1878 if (sdp->type == TYPE_RBC) { 1879 modepage = 6; 1880 dbd = 8; 1881 } else { 1882 modepage = 8; 1883 dbd = 0; 1884 } 1885 1886 /* cautiously ask */ 1887 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); 1888 1889 if (!scsi_status_is_good(res)) 1890 goto bad_sense; 1891 1892 if (!data.header_length) { 1893 modepage = 6; 1894 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 1895 } 1896 1897 /* that went OK, now ask for the proper length */ 1898 len = data.length; 1899 1900 /* 1901 * We're only interested in the first three bytes, actually. 1902 * But the data cache page is defined for the first 20. 1903 */ 1904 if (len < 3) 1905 goto bad_sense; 1906 if (len > 20) 1907 len = 20; 1908 1909 /* Take headers and block descriptors into account */ 1910 len += data.header_length + data.block_descriptor_length; 1911 if (len > SD_BUF_SIZE) 1912 goto bad_sense; 1913 1914 /* Get the data */ 1915 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); 1916 1917 if (scsi_status_is_good(res)) { 1918 int offset = data.header_length + data.block_descriptor_length; 1919 1920 if (offset >= SD_BUF_SIZE - 2) { 1921 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); 1922 goto defaults; 1923 } 1924 1925 if ((buffer[offset] & 0x3f) != modepage) { 1926 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 1927 goto defaults; 1928 } 1929 1930 if (modepage == 8) { 1931 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 1932 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 1933 } else { 1934 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 1935 sdkp->RCD = 0; 1936 } 1937 1938 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 1939 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 1940 sd_printk(KERN_NOTICE, sdkp, 1941 "Uses READ/WRITE(6), disabling FUA\n"); 1942 sdkp->DPOFUA = 0; 1943 } 1944 1945 if (sdkp->first_scan || old_wce != sdkp->WCE || 1946 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 1947 sd_printk(KERN_NOTICE, sdkp, 1948 "Write cache: %s, read cache: %s, %s\n", 1949 sdkp->WCE ? "enabled" : "disabled", 1950 sdkp->RCD ? "disabled" : "enabled", 1951 sdkp->DPOFUA ? "supports DPO and FUA" 1952 : "doesn't support DPO or FUA"); 1953 1954 return; 1955 } 1956 1957bad_sense: 1958 if (scsi_sense_valid(&sshdr) && 1959 sshdr.sense_key == ILLEGAL_REQUEST && 1960 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 1961 /* Invalid field in CDB */ 1962 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 1963 else 1964 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 1965 1966defaults: 1967 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 1968 sdkp->WCE = 0; 1969 sdkp->RCD = 0; 1970 sdkp->DPOFUA = 0; 1971} 1972 1973/* 1974 * The ATO bit indicates whether the DIF application tag is available 1975 * for use by the operating system. 1976 */ 1977static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 1978{ 1979 int res, offset; 1980 struct scsi_device *sdp = sdkp->device; 1981 struct scsi_mode_data data; 1982 struct scsi_sense_hdr sshdr; 1983 1984 if (sdp->type != TYPE_DISK) 1985 return; 1986 1987 if (sdkp->protection_type == 0) 1988 return; 1989 1990 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 1991 SD_MAX_RETRIES, &data, &sshdr); 1992 1993 if (!scsi_status_is_good(res) || !data.header_length || 1994 data.length < 6) { 1995 sd_printk(KERN_WARNING, sdkp, 1996 "getting Control mode page failed, assume no ATO\n"); 1997 1998 if (scsi_sense_valid(&sshdr)) 1999 sd_print_sense_hdr(sdkp, &sshdr); 2000 2001 return; 2002 } 2003 2004 offset = data.header_length + data.block_descriptor_length; 2005 2006 if ((buffer[offset] & 0x3f) != 0x0a) { 2007 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 2008 return; 2009 } 2010 2011 if ((buffer[offset + 5] & 0x80) == 0) 2012 return; 2013 2014 sdkp->ATO = 1; 2015 2016 return; 2017} 2018 2019/** 2020 * sd_read_block_limits - Query disk device for preferred I/O sizes. 2021 * @disk: disk to query 2022 */ 2023static void sd_read_block_limits(struct scsi_disk *sdkp) 2024{ 2025 struct request_queue *q = sdkp->disk->queue; 2026 unsigned int sector_sz = sdkp->device->sector_size; 2027 const int vpd_len = 64; 2028 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 2029 2030 if (!buffer || 2031 /* Block Limits VPD */ 2032 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 2033 goto out; 2034 2035 blk_queue_io_min(sdkp->disk->queue, 2036 get_unaligned_be16(&buffer[6]) * sector_sz); 2037 blk_queue_io_opt(sdkp->disk->queue, 2038 get_unaligned_be32(&buffer[12]) * sector_sz); 2039 2040 /* Thin provisioning enabled and page length indicates TP support */ 2041 if (sdkp->thin_provisioning && buffer[3] == 0x3c) { 2042 unsigned int lba_count, desc_count, granularity; 2043 2044 lba_count = get_unaligned_be32(&buffer[20]); 2045 desc_count = get_unaligned_be32(&buffer[24]); 2046 2047 if (lba_count) { 2048 q->limits.max_discard_sectors = 2049 lba_count * sector_sz >> 9; 2050 2051 if (desc_count) 2052 sdkp->unmap = 1; 2053 } 2054 2055 granularity = get_unaligned_be32(&buffer[28]); 2056 2057 if (granularity) 2058 q->limits.discard_granularity = granularity * sector_sz; 2059 2060 if (buffer[32] & 0x80) 2061 q->limits.discard_alignment = 2062 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 2063 } 2064 2065 out: 2066 kfree(buffer); 2067} 2068 2069/** 2070 * sd_read_block_characteristics - Query block dev. characteristics 2071 * @disk: disk to query 2072 */ 2073static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2074{ 2075 unsigned char *buffer; 2076 u16 rot; 2077 const int vpd_len = 64; 2078 2079 buffer = kmalloc(vpd_len, GFP_KERNEL); 2080 2081 if (!buffer || 2082 /* Block Device Characteristics VPD */ 2083 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2084 goto out; 2085 2086 rot = get_unaligned_be16(&buffer[4]); 2087 2088 if (rot == 1) 2089 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); 2090 2091 out: 2092 kfree(buffer); 2093} 2094 2095static int sd_try_extended_inquiry(struct scsi_device *sdp) 2096{ 2097 /* 2098 * Although VPD inquiries can go to SCSI-2 type devices, 2099 * some USB ones crash on receiving them, and the pages 2100 * we currently ask for are for SPC-3 and beyond 2101 */ 2102 if (sdp->scsi_level > SCSI_SPC_2) 2103 return 1; 2104 return 0; 2105} 2106 2107/** 2108 * sd_revalidate_disk - called the first time a new disk is seen, 2109 * performs disk spin up, read_capacity, etc. 2110 * @disk: struct gendisk we care about 2111 **/ 2112static int sd_revalidate_disk(struct gendisk *disk) 2113{ 2114 struct scsi_disk *sdkp = scsi_disk(disk); 2115 struct scsi_device *sdp = sdkp->device; 2116 unsigned char *buffer; 2117 unsigned ordered; 2118 2119 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 2120 "sd_revalidate_disk\n")); 2121 2122 /* 2123 * If the device is offline, don't try and read capacity or any 2124 * of the other niceties. 2125 */ 2126 if (!scsi_device_online(sdp)) 2127 goto out; 2128 2129 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 2130 if (!buffer) { 2131 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 2132 "allocation failure.\n"); 2133 goto out; 2134 } 2135 2136 sd_spinup_disk(sdkp); 2137 2138 /* 2139 * Without media there is no reason to ask; moreover, some devices 2140 * react badly if we do. 2141 */ 2142 if (sdkp->media_present) { 2143 sd_read_capacity(sdkp, buffer); 2144 2145 if (sd_try_extended_inquiry(sdp)) { 2146 sd_read_block_limits(sdkp); 2147 sd_read_block_characteristics(sdkp); 2148 } 2149 2150 sd_read_write_protect_flag(sdkp, buffer); 2151 sd_read_cache_type(sdkp, buffer); 2152 sd_read_app_tag_own(sdkp, buffer); 2153 } 2154 2155 sdkp->first_scan = 0; 2156 2157 /* 2158 * We now have all cache related info, determine how we deal 2159 * with ordered requests. Note that as the current SCSI 2160 * dispatch function can alter request order, we cannot use 2161 * QUEUE_ORDERED_TAG_* even when ordered tag is supported. 2162 */ 2163 if (sdkp->WCE) 2164 ordered = sdkp->DPOFUA 2165 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; 2166 else 2167 ordered = QUEUE_ORDERED_DRAIN; 2168 2169 blk_queue_ordered(sdkp->disk->queue, ordered); 2170 2171 set_capacity(disk, sdkp->capacity); 2172 kfree(buffer); 2173 2174 out: 2175 return 0; 2176} 2177 2178/** 2179 * sd_unlock_native_capacity - unlock native capacity 2180 * @disk: struct gendisk to set capacity for 2181 * 2182 * Block layer calls this function if it detects that partitions 2183 * on @disk reach beyond the end of the device. If the SCSI host 2184 * implements ->unlock_native_capacity() method, it's invoked to 2185 * give it a chance to adjust the device capacity. 2186 * 2187 * CONTEXT: 2188 * Defined by block layer. Might sleep. 2189 */ 2190static void sd_unlock_native_capacity(struct gendisk *disk) 2191{ 2192 struct scsi_device *sdev = scsi_disk(disk)->device; 2193 2194 if (sdev->host->hostt->unlock_native_capacity) 2195 sdev->host->hostt->unlock_native_capacity(sdev); 2196} 2197 2198/** 2199 * sd_format_disk_name - format disk name 2200 * @prefix: name prefix - ie. "sd" for SCSI disks 2201 * @index: index of the disk to format name for 2202 * @buf: output buffer 2203 * @buflen: length of the output buffer 2204 * 2205 * SCSI disk names starts at sda. The 26th device is sdz and the 2206 * 27th is sdaa. The last one for two lettered suffix is sdzz 2207 * which is followed by sdaaa. 2208 * 2209 * This is basically 26 base counting with one extra 'nil' entry 2210 * at the beginning from the second digit on and can be 2211 * determined using similar method as 26 base conversion with the 2212 * index shifted -1 after each digit is computed. 2213 * 2214 * CONTEXT: 2215 * Don't care. 2216 * 2217 * RETURNS: 2218 * 0 on success, -errno on failure. 2219 */ 2220static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 2221{ 2222 const int base = 'z' - 'a' + 1; 2223 char *begin = buf + strlen(prefix); 2224 char *end = buf + buflen; 2225 char *p; 2226 int unit; 2227 2228 p = end - 1; 2229 *p = '\0'; 2230 unit = base; 2231 do { 2232 if (p == begin) 2233 return -EINVAL; 2234 *--p = 'a' + (index % unit); 2235 index = (index / unit) - 1; 2236 } while (index >= 0); 2237 2238 memmove(begin, p, end - p); 2239 memcpy(buf, prefix, strlen(prefix)); 2240 2241 return 0; 2242} 2243 2244/* 2245 * The asynchronous part of sd_probe 2246 */ 2247static void sd_probe_async(void *data, async_cookie_t cookie) 2248{ 2249 struct scsi_disk *sdkp = data; 2250 struct scsi_device *sdp; 2251 struct gendisk *gd; 2252 u32 index; 2253 struct device *dev; 2254 2255 sdp = sdkp->device; 2256 gd = sdkp->disk; 2257 index = sdkp->index; 2258 dev = &sdp->sdev_gendev; 2259 2260 gd->major = sd_major((index & 0xf0) >> 4); 2261 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 2262 gd->minors = SD_MINORS; 2263 2264 gd->fops = &sd_fops; 2265 gd->private_data = &sdkp->driver; 2266 gd->queue = sdkp->device->request_queue; 2267 2268 /* defaults, until the device tells us otherwise */ 2269 sdp->sector_size = 512; 2270 sdkp->capacity = 0; 2271 sdkp->media_present = 1; 2272 sdkp->write_prot = 0; 2273 sdkp->WCE = 0; 2274 sdkp->RCD = 0; 2275 sdkp->ATO = 0; 2276 sdkp->first_scan = 1; 2277 2278 sd_revalidate_disk(gd); 2279 2280 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); 2281 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn); 2282 2283 gd->driverfs_dev = &sdp->sdev_gendev; 2284 gd->flags = GENHD_FL_EXT_DEVT; 2285 if (sdp->removable) 2286 gd->flags |= GENHD_FL_REMOVABLE; 2287 2288 add_disk(gd); 2289 sd_dif_config_host(sdkp); 2290 2291 sd_revalidate_disk(gd); 2292 2293 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 2294 sdp->removable ? "removable " : ""); 2295 scsi_autopm_put_device(sdp); 2296 put_device(&sdkp->dev); 2297} 2298 2299/** 2300 * sd_probe - called during driver initialization and whenever a 2301 * new scsi device is attached to the system. It is called once 2302 * for each scsi device (not just disks) present. 2303 * @dev: pointer to device object 2304 * 2305 * Returns 0 if successful (or not interested in this scsi device 2306 * (e.g. scanner)); 1 when there is an error. 2307 * 2308 * Note: this function is invoked from the scsi mid-level. 2309 * This function sets up the mapping between a given 2310 * <host,channel,id,lun> (found in sdp) and new device name 2311 * (e.g. /dev/sda). More precisely it is the block device major 2312 * and minor number that is chosen here. 2313 * 2314 * Assume sd_attach is not re-entrant (for time being) 2315 * Also think about sd_attach() and sd_remove() running coincidentally. 2316 **/ 2317static int sd_probe(struct device *dev) 2318{ 2319 struct scsi_device *sdp = to_scsi_device(dev); 2320 struct scsi_disk *sdkp; 2321 struct gendisk *gd; 2322 int index; 2323 int error; 2324 2325 error = -ENODEV; 2326 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 2327 goto out; 2328 2329 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 2330 "sd_attach\n")); 2331 2332 error = -ENOMEM; 2333 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 2334 if (!sdkp) 2335 goto out; 2336 2337 gd = alloc_disk(SD_MINORS); 2338 if (!gd) 2339 goto out_free; 2340 2341 do { 2342 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 2343 goto out_put; 2344 2345 spin_lock(&sd_index_lock); 2346 error = ida_get_new(&sd_index_ida, &index); 2347 spin_unlock(&sd_index_lock); 2348 } while (error == -EAGAIN); 2349 2350 if (error) 2351 goto out_put; 2352 2353 if (index >= SD_MAX_DISKS) { 2354 error = -ENODEV; 2355 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name space exhausted.\n"); 2356 goto out_free_index; 2357 } 2358 2359 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 2360 if (error) 2361 goto out_free_index; 2362 2363 sdkp->device = sdp; 2364 sdkp->driver = &sd_template; 2365 sdkp->disk = gd; 2366 sdkp->index = index; 2367 atomic_set(&sdkp->openers, 0); 2368 sdkp->previous_state = 1; 2369 2370 if (!sdp->request_queue->rq_timeout) { 2371 if (sdp->type != TYPE_MOD) 2372 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 2373 else 2374 blk_queue_rq_timeout(sdp->request_queue, 2375 SD_MOD_TIMEOUT); 2376 } 2377 2378 device_initialize(&sdkp->dev); 2379 sdkp->dev.parent = dev; 2380 sdkp->dev.class = &sd_disk_class; 2381 dev_set_name(&sdkp->dev, dev_name(dev)); 2382 2383 if (device_add(&sdkp->dev)) 2384 goto out_free_index; 2385 2386 get_device(dev); 2387 dev_set_drvdata(dev, sdkp); 2388 2389 get_device(&sdkp->dev); /* prevent release before async_schedule */ 2390 async_schedule(sd_probe_async, sdkp); 2391 2392 return 0; 2393 2394 out_free_index: 2395 spin_lock(&sd_index_lock); 2396 ida_remove(&sd_index_ida, index); 2397 spin_unlock(&sd_index_lock); 2398 out_put: 2399 put_disk(gd); 2400 out_free: 2401 kfree(sdkp); 2402 out: 2403 return error; 2404} 2405 2406/** 2407 * sd_remove - called whenever a scsi disk (previously recognized by 2408 * sd_probe) is detached from the system. It is called (potentially 2409 * multiple times) during sd module unload. 2410 * @sdp: pointer to mid level scsi device object 2411 * 2412 * Note: this function is invoked from the scsi mid-level. 2413 * This function potentially frees up a device name (e.g. /dev/sdc) 2414 * that could be re-used by a subsequent sd_probe(). 2415 * This function is not called when the built-in sd driver is "exit-ed". 2416 **/ 2417static int sd_remove(struct device *dev) 2418{ 2419 struct scsi_disk *sdkp; 2420 2421 sdkp = dev_get_drvdata(dev); 2422 scsi_autopm_get_device(sdkp->device); 2423 2424 async_synchronize_full(); 2425 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); 2426 blk_queue_unprep_rq(sdkp->device->request_queue, NULL); 2427 device_del(&sdkp->dev); 2428 del_gendisk(sdkp->disk); 2429 sd_shutdown(dev); 2430 2431 mutex_lock(&sd_ref_mutex); 2432 dev_set_drvdata(dev, NULL); 2433 put_device(&sdkp->dev); 2434 mutex_unlock(&sd_ref_mutex); 2435 2436 return 0; 2437} 2438 2439/** 2440 * scsi_disk_release - Called to free the scsi_disk structure 2441 * @dev: pointer to embedded class device 2442 * 2443 * sd_ref_mutex must be held entering this routine. Because it is 2444 * called on last put, you should always use the scsi_disk_get() 2445 * scsi_disk_put() helpers which manipulate the semaphore directly 2446 * and never do a direct put_device. 2447 **/ 2448static void scsi_disk_release(struct device *dev) 2449{ 2450 struct scsi_disk *sdkp = to_scsi_disk(dev); 2451 struct gendisk *disk = sdkp->disk; 2452 2453 spin_lock(&sd_index_lock); 2454 ida_remove(&sd_index_ida, sdkp->index); 2455 spin_unlock(&sd_index_lock); 2456 2457 disk->private_data = NULL; 2458 put_disk(disk); 2459 put_device(&sdkp->device->sdev_gendev); 2460 2461 kfree(sdkp); 2462} 2463 2464static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 2465{ 2466 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 2467 struct scsi_sense_hdr sshdr; 2468 struct scsi_device *sdp = sdkp->device; 2469 int res; 2470 2471 if (start) 2472 cmd[4] |= 1; /* START */ 2473 2474 if (sdp->start_stop_pwr_cond) 2475 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 2476 2477 if (!scsi_device_online(sdp)) 2478 return -ENODEV; 2479 2480 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 2481 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2482 if (res) { 2483 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 2484 sd_print_result(sdkp, res); 2485 if (driver_byte(res) & DRIVER_SENSE) 2486 sd_print_sense_hdr(sdkp, &sshdr); 2487 } 2488 2489 return res; 2490} 2491 2492/* 2493 * Send a SYNCHRONIZE CACHE instruction down to the device through 2494 * the normal SCSI command structure. Wait for the command to 2495 * complete. 2496 */ 2497static void sd_shutdown(struct device *dev) 2498{ 2499 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2500 2501 if (!sdkp) 2502 return; /* this can happen */ 2503 2504 if (sdkp->WCE) { 2505 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2506 sd_sync_cache(sdkp); 2507 } 2508 2509 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 2510 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2511 sd_start_stop_device(sdkp, 0); 2512 } 2513 2514 scsi_disk_put(sdkp); 2515} 2516 2517static int sd_suspend(struct device *dev, pm_message_t mesg) 2518{ 2519 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2520 int ret = 0; 2521 2522 if (!sdkp) 2523 return 0; /* this can happen */ 2524 2525 if (sdkp->WCE) { 2526 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2527 ret = sd_sync_cache(sdkp); 2528 if (ret) 2529 goto done; 2530 } 2531 2532 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { 2533 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2534 ret = sd_start_stop_device(sdkp, 0); 2535 } 2536 2537done: 2538 scsi_disk_put(sdkp); 2539 return ret; 2540} 2541 2542static int sd_resume(struct device *dev) 2543{ 2544 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2545 int ret = 0; 2546 2547 if (!sdkp->device->manage_start_stop) 2548 goto done; 2549 2550 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 2551 ret = sd_start_stop_device(sdkp, 1); 2552 2553done: 2554 scsi_disk_put(sdkp); 2555 return ret; 2556} 2557 2558/** 2559 * init_sd - entry point for this driver (both when built in or when 2560 * a module). 2561 * 2562 * Note: this function registers this driver with the scsi mid-level. 2563 **/ 2564static int __init init_sd(void) 2565{ 2566 int majors = 0, i, err; 2567 2568 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 2569 2570 for (i = 0; i < SD_MAJORS; i++) 2571 if (register_blkdev(sd_major(i), "sd") == 0) 2572 majors++; 2573 2574 if (!majors) 2575 return -ENODEV; 2576 2577 err = class_register(&sd_disk_class); 2578 if (err) 2579 goto err_out; 2580 2581 err = scsi_register_driver(&sd_template.gendrv); 2582 if (err) 2583 goto err_out_class; 2584 2585 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 2586 0, 0, NULL); 2587 if (!sd_cdb_cache) { 2588 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 2589 goto err_out_class; 2590 } 2591 2592 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 2593 if (!sd_cdb_pool) { 2594 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 2595 goto err_out_cache; 2596 } 2597 2598 return 0; 2599 2600err_out_cache: 2601 kmem_cache_destroy(sd_cdb_cache); 2602 2603err_out_class: 2604 class_unregister(&sd_disk_class); 2605err_out: 2606 for (i = 0; i < SD_MAJORS; i++) 2607 unregister_blkdev(sd_major(i), "sd"); 2608 return err; 2609} 2610 2611/** 2612 * exit_sd - exit point for this driver (when it is a module). 2613 * 2614 * Note: this function unregisters this driver from the scsi mid-level. 2615 **/ 2616static void __exit exit_sd(void) 2617{ 2618 int i; 2619 2620 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 2621 2622 mempool_destroy(sd_cdb_pool); 2623 kmem_cache_destroy(sd_cdb_cache); 2624 2625 scsi_unregister_driver(&sd_template.gendrv); 2626 class_unregister(&sd_disk_class); 2627 2628 for (i = 0; i < SD_MAJORS; i++) 2629 unregister_blkdev(sd_major(i), "sd"); 2630} 2631 2632module_init(init_sd); 2633module_exit(exit_sd); 2634 2635static void sd_print_sense_hdr(struct scsi_disk *sdkp, 2636 struct scsi_sense_hdr *sshdr) 2637{ 2638 sd_printk(KERN_INFO, sdkp, " "); 2639 scsi_show_sense_hdr(sshdr); 2640 sd_printk(KERN_INFO, sdkp, " "); 2641 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 2642} 2643 2644static void sd_print_result(struct scsi_disk *sdkp, int result) 2645{ 2646 sd_printk(KERN_INFO, sdkp, " "); 2647 scsi_show_result(result); 2648} 2649