drivers/scsi/sd.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *      sd.c Copyright (C) 1992 Drew Eckhardt
   4  *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   5  *
   6  *      Linux scsi disk driver
   7  *              Initial versions: Drew Eckhardt
   8  *              Subsequent revisions: Eric Youngdale
   9  *      Modification history:
  10  *       - Drew Eckhardt <drew@colorado.edu> original
  11  *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
  12  *         outstanding request, and other enhancements.
  13  *         Support loadable low-level scsi drivers.
  14  *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
  15  *         eight major numbers.
  16  *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
  17  *       - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
  18  *         sd_init and cleanups.
  19  *       - Alex Davis <letmein@erols.com> Fix problem where partition info
  20  *         not being read in sd_open. Fix problem where removable media
  21  *         could be ejected after sd_open.
  22  *       - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
  23  *       - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
  24  *         <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
  25  *         Support 32k/1M disks.
  26  *
  27  *      Logging policy (needs CONFIG_SCSI_LOGGING defined):
  28  *       - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  29  *       - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  30  *       - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  31  *       - entering other commands: SCSI_LOG_HLQUEUE level 3
  32  *      Note: when the logging level is set by the user, it must be greater
  33  *      than the level indicated above to trigger output.
  34  */
  35
  36 #include <linux/module.h>
  37 #include <linux/fs.h>
  38 #include <linux/kernel.h>
  39 #include <linux/mm.h>
  40 #include <linux/bio.h>
  41 #include <linux/genhd.h>
  42 #include <linux/hdreg.h>
  43 #include <linux/errno.h>
  44 #include <linux/idr.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/init.h>
  47 #include <linux/blkdev.h>
  48 #include <linux/blkpg.h>
  49 #include <linux/blk-pm.h>
  50 #include <linux/delay.h>
  51 #include <linux/mutex.h>
  52 #include <linux/string_helpers.h>
  53 #include <linux/async.h>
  54 #include <linux/slab.h>
  55 #include <linux/sed-opal.h>
  56 #include <linux/pm_runtime.h>
  57 #include <linux/pr.h>
  58 #include <linux/t10-pi.h>
  59 #include <linux/uaccess.h>
  60 #include <asm/unaligned.h>
  61
  62 #include <scsi/scsi.h>
  63 #include <scsi/scsi_cmnd.h>
  64 #include <scsi/scsi_dbg.h>
  65 #include <scsi/scsi_device.h>
  66 #include <scsi/scsi_driver.h>
  67 #include <scsi/scsi_eh.h>
  68 #include <scsi/scsi_host.h>
  69 #include <scsi/scsi_ioctl.h>
  70 #include <scsi/scsicam.h>
  71
  72 #include "sd.h"
  73 #include "scsi_priv.h"
  74 #include "scsi_logging.h"
  75
  76 MODULE_AUTHOR("Eric Youngdale");
  77 MODULE_DESCRIPTION("SCSI disk (sd) driver");
  78 MODULE_LICENSE("GPL");
  79
  80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  94 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  95 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  96 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  97 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  98 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  99 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
 100
 101 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
 102 #define SD_MINORS       16
 103 #else
 104 #define SD_MINORS       0
 105 #endif
 106
 107 static void sd_config_discard(struct scsi_disk *, unsigned int);
 108 static void sd_config_write_same(struct scsi_disk *);
 109 static int  sd_revalidate_disk(struct gendisk *);
 110 static void sd_unlock_native_capacity(struct gendisk *disk);
 111 static int  sd_probe(struct device *);
 112 static int  sd_remove(struct device *);
 113 static void sd_shutdown(struct device *);
 114 static int sd_suspend_system(struct device *);
 115 static int sd_suspend_runtime(struct device *);
 116 static int sd_resume(struct device *);
 117 static void sd_rescan(struct device *);
 118 static blk_status_t sd_init_command(struct scsi_cmnd *SCpnt);
 119 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 120 static int sd_done(struct scsi_cmnd *);
 121 static void sd_eh_reset(struct scsi_cmnd *);
 122 static int sd_eh_action(struct scsi_cmnd *, int);
 123 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 124 static void scsi_disk_release(struct device *cdev);
 125 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 126 static void sd_print_result(const struct scsi_disk *, const char *, int);
 127
 128 static DEFINE_IDA(sd_index_ida);
 129
 130 /* This semaphore is used to mediate the 0->1 reference get in the
 131  * face of object destruction (i.e. we can't allow a get on an
 132  * object after last put) */
 133 static DEFINE_MUTEX(sd_ref_mutex);
 134
 135 static struct kmem_cache *sd_cdb_cache;
 136 static mempool_t *sd_cdb_pool;
 137 static mempool_t *sd_page_pool;
 138
 139 static const char *sd_cache_types[] = {
 140         "write through", "none", "write back",
 141         "write back, no read (daft)"
 142 };
 143
 144 static void sd_set_flush_flag(struct scsi_disk *sdkp)
 145 {
 146         bool wc = false, fua = false;
 147
 148         if (sdkp->WCE) {
 149                 wc = true;
 150                 if (sdkp->DPOFUA)
 151                         fua = true;
 152         }
 153
 154         blk_queue_write_cache(sdkp->disk->queue, wc, fua);
 155 }
 156
 157 static ssize_t
 158 cache_type_store(struct device *dev, struct device_attribute *attr,
 159                  const char *buf, size_t count)
 160 {
 161         int ct, rcd, wce, sp;
 162         struct scsi_disk *sdkp = to_scsi_disk(dev);
 163         struct scsi_device *sdp = sdkp->device;
 164         char buffer[64];
 165         char *buffer_data;
 166         struct scsi_mode_data data;
 167         struct scsi_sense_hdr sshdr;
 168         static const char temp[] = "temporary ";
 169         int len;
 170
 171         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 172                 /* no cache control on RBC devices; theoretically they
 173                  * can do it, but there's probably so many exceptions
 174                  * it's not worth the risk */
 175                 return -EINVAL;
 176
 177         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 178                 buf += sizeof(temp) - 1;
 179                 sdkp->cache_override = 1;
 180         } else {
 181                 sdkp->cache_override = 0;
 182         }
 183
 184         ct = sysfs_match_string(sd_cache_types, buf);
 185         if (ct < 0)
 186                 return -EINVAL;
 187
 188         rcd = ct & 0x01 ? 1 : 0;
 189         wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 190
 191         if (sdkp->cache_override) {
 192                 sdkp->WCE = wce;
 193                 sdkp->RCD = rcd;
 194                 sd_set_flush_flag(sdkp);
 195                 return count;
 196         }
 197
 198         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 199                             SD_MAX_RETRIES, &data, NULL))
 200                 return -EINVAL;
 201         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 202                   data.block_descriptor_length);
 203         buffer_data = buffer + data.header_length +
 204                 data.block_descriptor_length;
 205         buffer_data[2] &= ~0x05;
 206         buffer_data[2] |= wce << 2 | rcd;
 207         sp = buffer_data[0] & 0x80 ? 1 : 0;
 208         buffer_data[0] &= ~0x80;
 209
 210         /*
 211          * Ensure WP, DPOFUA, and RESERVED fields are cleared in
 212          * received mode parameter buffer before doing MODE SELECT.
 213          */
 214         data.device_specific = 0;
 215
 216         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 217                              SD_MAX_RETRIES, &data, &sshdr)) {
 218                 if (scsi_sense_valid(&sshdr))
 219                         sd_print_sense_hdr(sdkp, &sshdr);
 220                 return -EINVAL;
 221         }
 222         revalidate_disk(sdkp->disk);
 223         return count;
 224 }
 225
 226 static ssize_t
 227 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
 228                        char *buf)
 229 {
 230         struct scsi_disk *sdkp = to_scsi_disk(dev);
 231         struct scsi_device *sdp = sdkp->device;
 232
 233         return sprintf(buf, "%u\n", sdp->manage_start_stop);
 234 }
 235
 236 static ssize_t
 237 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
 238                         const char *buf, size_t count)
 239 {
 240         struct scsi_disk *sdkp = to_scsi_disk(dev);
 241         struct scsi_device *sdp = sdkp->device;
 242         bool v;
 243
 244         if (!capable(CAP_SYS_ADMIN))
 245                 return -EACCES;
 246
 247         if (kstrtobool(buf, &v))
 248                 return -EINVAL;
 249
 250         sdp->manage_start_stop = v;
 251
 252         return count;
 253 }
 254 static DEVICE_ATTR_RW(manage_start_stop);
 255
 256 static ssize_t
 257 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 258 {
 259         struct scsi_disk *sdkp = to_scsi_disk(dev);
 260
 261         return sprintf(buf, "%u\n", sdkp->device->allow_restart);
 262 }
 263
 264 static ssize_t
 265 allow_restart_store(struct device *dev, struct device_attribute *attr,
 266                     const char *buf, size_t count)
 267 {
 268         bool v;
 269         struct scsi_disk *sdkp = to_scsi_disk(dev);
 270         struct scsi_device *sdp = sdkp->device;
 271
 272         if (!capable(CAP_SYS_ADMIN))
 273                 return -EACCES;
 274
 275         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 276                 return -EINVAL;
 277
 278         if (kstrtobool(buf, &v))
 279                 return -EINVAL;
 280
 281         sdp->allow_restart = v;
 282
 283         return count;
 284 }
 285 static DEVICE_ATTR_RW(allow_restart);
 286
 287 static ssize_t
 288 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 289 {
 290         struct scsi_disk *sdkp = to_scsi_disk(dev);
 291         int ct = sdkp->RCD + 2*sdkp->WCE;
 292
 293         return sprintf(buf, "%s\n", sd_cache_types[ct]);
 294 }
 295 static DEVICE_ATTR_RW(cache_type);
 296
 297 static ssize_t
 298 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 299 {
 300         struct scsi_disk *sdkp = to_scsi_disk(dev);
 301
 302         return sprintf(buf, "%u\n", sdkp->DPOFUA);
 303 }
 304 static DEVICE_ATTR_RO(FUA);
 305
 306 static ssize_t
 307 protection_type_show(struct device *dev, struct device_attribute *attr,
 308                      char *buf)
 309 {
 310         struct scsi_disk *sdkp = to_scsi_disk(dev);
 311
 312         return sprintf(buf, "%u\n", sdkp->protection_type);
 313 }
 314
 315 static ssize_t
 316 protection_type_store(struct device *dev, struct device_attribute *attr,
 317                       const char *buf, size_t count)
 318 {
 319         struct scsi_disk *sdkp = to_scsi_disk(dev);
 320         unsigned int val;
 321         int err;
 322
 323         if (!capable(CAP_SYS_ADMIN))
 324                 return -EACCES;
 325
 326         err = kstrtouint(buf, 10, &val);
 327
 328         if (err)
 329                 return err;
 330
 331         if (val <= T10_PI_TYPE3_PROTECTION)
 332                 sdkp->protection_type = val;
 333
 334         return count;
 335 }
 336 static DEVICE_ATTR_RW(protection_type);
 337
 338 static ssize_t
 339 protection_mode_show(struct device *dev, struct device_attribute *attr,
 340                      char *buf)
 341 {
 342         struct scsi_disk *sdkp = to_scsi_disk(dev);
 343         struct scsi_device *sdp = sdkp->device;
 344         unsigned int dif, dix;
 345
 346         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 347         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 348
 349         if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
 350                 dif = 0;
 351                 dix = 1;
 352         }
 353
 354         if (!dif && !dix)
 355                 return sprintf(buf, "none\n");
 356
 357         return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
 358 }
 359 static DEVICE_ATTR_RO(protection_mode);
 360
 361 static ssize_t
 362 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 363 {
 364         struct scsi_disk *sdkp = to_scsi_disk(dev);
 365
 366         return sprintf(buf, "%u\n", sdkp->ATO);
 367 }
 368 static DEVICE_ATTR_RO(app_tag_own);
 369
 370 static ssize_t
 371 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
 372                        char *buf)
 373 {
 374         struct scsi_disk *sdkp = to_scsi_disk(dev);
 375
 376         return sprintf(buf, "%u\n", sdkp->lbpme);
 377 }
 378 static DEVICE_ATTR_RO(thin_provisioning);
 379
 380 /* sysfs_match_string() requires dense arrays */
 381 static const char *lbp_mode[] = {
 382         [SD_LBP_FULL]           = "full",
 383         [SD_LBP_UNMAP]          = "unmap",
 384         [SD_LBP_WS16]           = "writesame_16",
 385         [SD_LBP_WS10]           = "writesame_10",
 386         [SD_LBP_ZERO]           = "writesame_zero",
 387         [SD_LBP_DISABLE]        = "disabled",
 388 };
 389
 390 static ssize_t
 391 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
 392                        char *buf)
 393 {
 394         struct scsi_disk *sdkp = to_scsi_disk(dev);
 395
 396         return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 397 }
 398
 399 static ssize_t
 400 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
 401                         const char *buf, size_t count)
 402 {
 403         struct scsi_disk *sdkp = to_scsi_disk(dev);
 404         struct scsi_device *sdp = sdkp->device;
 405         int mode;
 406
 407         if (!capable(CAP_SYS_ADMIN))
 408                 return -EACCES;
 409
 410         if (sd_is_zoned(sdkp)) {
 411                 sd_config_discard(sdkp, SD_LBP_DISABLE);
 412                 return count;
 413         }
 414
 415         if (sdp->type != TYPE_DISK)
 416                 return -EINVAL;
 417
 418         mode = sysfs_match_string(lbp_mode, buf);
 419         if (mode < 0)
 420                 return -EINVAL;
 421
 422         sd_config_discard(sdkp, mode);
 423
 424         return count;
 425 }
 426 static DEVICE_ATTR_RW(provisioning_mode);
 427
 428 /* sysfs_match_string() requires dense arrays */
 429 static const char *zeroing_mode[] = {
 430         [SD_ZERO_WRITE]         = "write",
 431         [SD_ZERO_WS]            = "writesame",
 432         [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
 433         [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
 434 };
 435
 436 static ssize_t
 437 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
 438                   char *buf)
 439 {
 440         struct scsi_disk *sdkp = to_scsi_disk(dev);
 441
 442         return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
 443 }
 444
 445 static ssize_t
 446 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
 447                    const char *buf, size_t count)
 448 {
 449         struct scsi_disk *sdkp = to_scsi_disk(dev);
 450         int mode;
 451
 452         if (!capable(CAP_SYS_ADMIN))
 453                 return -EACCES;
 454
 455         mode = sysfs_match_string(zeroing_mode, buf);
 456         if (mode < 0)
 457                 return -EINVAL;
 458
 459         sdkp->zeroing_mode = mode;
 460
 461         return count;
 462 }
 463 static DEVICE_ATTR_RW(zeroing_mode);
 464
 465 static ssize_t
 466 max_medium_access_timeouts_show(struct device *dev,
 467                                 struct device_attribute *attr, char *buf)
 468 {
 469         struct scsi_disk *sdkp = to_scsi_disk(dev);
 470
 471         return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
 472 }
 473
 474 static ssize_t
 475 max_medium_access_timeouts_store(struct device *dev,
 476                                  struct device_attribute *attr, const char *buf,
 477                                  size_t count)
 478 {
 479         struct scsi_disk *sdkp = to_scsi_disk(dev);
 480         int err;
 481
 482         if (!capable(CAP_SYS_ADMIN))
 483                 return -EACCES;
 484
 485         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 486
 487         return err ? err : count;
 488 }
 489 static DEVICE_ATTR_RW(max_medium_access_timeouts);
 490
 491 static ssize_t
 492 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
 493                            char *buf)
 494 {
 495         struct scsi_disk *sdkp = to_scsi_disk(dev);
 496
 497         return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
 498 }
 499
 500 static ssize_t
 501 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
 502                             const char *buf, size_t count)
 503 {
 504         struct scsi_disk *sdkp = to_scsi_disk(dev);
 505         struct scsi_device *sdp = sdkp->device;
 506         unsigned long max;
 507         int err;
 508
 509         if (!capable(CAP_SYS_ADMIN))
 510                 return -EACCES;
 511
 512         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 513                 return -EINVAL;
 514
 515         err = kstrtoul(buf, 10, &max);
 516
 517         if (err)
 518                 return err;
 519
 520         if (max == 0)
 521                 sdp->no_write_same = 1;
 522         else if (max <= SD_MAX_WS16_BLOCKS) {
 523                 sdp->no_write_same = 0;
 524                 sdkp->max_ws_blocks = max;
 525         }
 526
 527         sd_config_write_same(sdkp);
 528
 529         return count;
 530 }
 531 static DEVICE_ATTR_RW(max_write_same_blocks);
 532
 533 static struct attribute *sd_disk_attrs[] = {
 534         &dev_attr_cache_type.attr,
 535         &dev_attr_FUA.attr,
 536         &dev_attr_allow_restart.attr,
 537         &dev_attr_manage_start_stop.attr,
 538         &dev_attr_protection_type.attr,
 539         &dev_attr_protection_mode.attr,
 540         &dev_attr_app_tag_own.attr,
 541         &dev_attr_thin_provisioning.attr,
 542         &dev_attr_provisioning_mode.attr,
 543         &dev_attr_zeroing_mode.attr,
 544         &dev_attr_max_write_same_blocks.attr,
 545         &dev_attr_max_medium_access_timeouts.attr,
 546         NULL,
 547 };
 548 ATTRIBUTE_GROUPS(sd_disk);
 549
 550 static struct class sd_disk_class = {
 551         .name           = "scsi_disk",
 552         .owner          = THIS_MODULE,
 553         .dev_release    = scsi_disk_release,
 554         .dev_groups     = sd_disk_groups,
 555 };
 556
 557 static const struct dev_pm_ops sd_pm_ops = {
 558         .suspend                = sd_suspend_system,
 559         .resume                 = sd_resume,
 560         .poweroff               = sd_suspend_system,
 561         .restore                = sd_resume,
 562         .runtime_suspend        = sd_suspend_runtime,
 563         .runtime_resume         = sd_resume,
 564 };
 565
 566 static struct scsi_driver sd_template = {
 567         .gendrv = {
 568                 .name           = "sd",
 569                 .owner          = THIS_MODULE,
 570                 .probe          = sd_probe,
 571                 .probe_type     = PROBE_PREFER_ASYNCHRONOUS,
 572                 .remove         = sd_remove,
 573                 .shutdown       = sd_shutdown,
 574                 .pm             = &sd_pm_ops,
 575         },
 576         .rescan                 = sd_rescan,
 577         .init_command           = sd_init_command,
 578         .uninit_command         = sd_uninit_command,
 579         .done                   = sd_done,
 580         .eh_action              = sd_eh_action,
 581         .eh_reset               = sd_eh_reset,
 582 };
 583
 584 /*
 585  * Dummy kobj_map->probe function.
 586  * The default ->probe function will call modprobe, which is
 587  * pointless as this module is already loaded.
 588  */
 589 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
 590 {
 591         return NULL;
 592 }
 593
 594 /*
 595  * Device no to disk mapping:
 596  *
 597  *       major         disc2     disc  p1
 598  *   |............|.............|....|....| <- dev_t
 599  *    31        20 19          8 7  4 3  0
 600  *
 601  * Inside a major, we have 16k disks, however mapped non-
 602  * contiguously. The first 16 disks are for major0, the next
 603  * ones with major1, ... Disk 256 is for major0 again, disk 272
 604  * for major1, ...
 605  * As we stay compatible with our numbering scheme, we can reuse
 606  * the well-know SCSI majors 8, 65--71, 136--143.
 607  */
 608 static int sd_major(int major_idx)
 609 {
 610         switch (major_idx) {
 611         case 0:
 612                 return SCSI_DISK0_MAJOR;
 613         case 1 ... 7:
 614                 return SCSI_DISK1_MAJOR + major_idx - 1;
 615         case 8 ... 15:
 616                 return SCSI_DISK8_MAJOR + major_idx - 8;
 617         default:
 618                 BUG();
 619                 return 0;       /* shut up gcc */
 620         }
 621 }
 622
 623 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 624 {
 625         struct scsi_disk *sdkp = NULL;
 626
 627         mutex_lock(&sd_ref_mutex);
 628
 629         if (disk->private_data) {
 630                 sdkp = scsi_disk(disk);
 631                 if (scsi_device_get(sdkp->device) == 0)
 632                         get_device(&sdkp->dev);
 633                 else
 634                         sdkp = NULL;
 635         }
 636         mutex_unlock(&sd_ref_mutex);
 637         return sdkp;
 638 }
 639
 640 static void scsi_disk_put(struct scsi_disk *sdkp)
 641 {
 642         struct scsi_device *sdev = sdkp->device;
 643
 644         mutex_lock(&sd_ref_mutex);
 645         put_device(&sdkp->dev);
 646         scsi_device_put(sdev);
 647         mutex_unlock(&sd_ref_mutex);
 648 }
 649
 650 #ifdef CONFIG_BLK_SED_OPAL
 651 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
 652                 size_t len, bool send)
 653 {
 654         struct scsi_device *sdev = data;
 655         u8 cdb[12] = { 0, };
 656         int ret;
 657
 658         cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
 659         cdb[1] = secp;
 660         put_unaligned_be16(spsp, &cdb[2]);
 661         put_unaligned_be32(len, &cdb[6]);
 662
 663         ret = scsi_execute_req(sdev, cdb,
 664                         send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
 665                         buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
 666         return ret <= 0 ? ret : -EIO;
 667 }
 668 #endif /* CONFIG_BLK_SED_OPAL */
 669
 670 /*
 671  * Look up the DIX operation based on whether the command is read or
 672  * write and whether dix and dif are enabled.
 673  */
 674 static unsigned int sd_prot_op(bool write, bool dix, bool dif)
 675 {
 676         /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
 677         static const unsigned int ops[] = {     /* wrt dix dif */
 678                 SCSI_PROT_NORMAL,               /*  0   0   0  */
 679                 SCSI_PROT_READ_STRIP,           /*  0   0   1  */
 680                 SCSI_PROT_READ_INSERT,          /*  0   1   0  */
 681                 SCSI_PROT_READ_PASS,            /*  0   1   1  */
 682                 SCSI_PROT_NORMAL,               /*  1   0   0  */
 683                 SCSI_PROT_WRITE_INSERT,         /*  1   0   1  */
 684                 SCSI_PROT_WRITE_STRIP,          /*  1   1   0  */
 685                 SCSI_PROT_WRITE_PASS,           /*  1   1   1  */
 686         };
 687
 688         return ops[write << 2 | dix << 1 | dif];
 689 }
 690
 691 /*
 692  * Returns a mask of the protection flags that are valid for a given DIX
 693  * operation.
 694  */
 695 static unsigned int sd_prot_flag_mask(unsigned int prot_op)
 696 {
 697         static const unsigned int flag_mask[] = {
 698                 [SCSI_PROT_NORMAL]              = 0,
 699
 700                 [SCSI_PROT_READ_STRIP]          = SCSI_PROT_TRANSFER_PI |
 701                                                   SCSI_PROT_GUARD_CHECK |
 702                                                   SCSI_PROT_REF_CHECK |
 703                                                   SCSI_PROT_REF_INCREMENT,
 704
 705                 [SCSI_PROT_READ_INSERT]         = SCSI_PROT_REF_INCREMENT |
 706                                                   SCSI_PROT_IP_CHECKSUM,
 707
 708                 [SCSI_PROT_READ_PASS]           = SCSI_PROT_TRANSFER_PI |
 709                                                   SCSI_PROT_GUARD_CHECK |
 710                                                   SCSI_PROT_REF_CHECK |
 711                                                   SCSI_PROT_REF_INCREMENT |
 712                                                   SCSI_PROT_IP_CHECKSUM,
 713
 714                 [SCSI_PROT_WRITE_INSERT]        = SCSI_PROT_TRANSFER_PI |
 715                                                   SCSI_PROT_REF_INCREMENT,
 716
 717                 [SCSI_PROT_WRITE_STRIP]         = SCSI_PROT_GUARD_CHECK |
 718                                                   SCSI_PROT_REF_CHECK |
 719                                                   SCSI_PROT_REF_INCREMENT |
 720                                                   SCSI_PROT_IP_CHECKSUM,
 721
 722                 [SCSI_PROT_WRITE_PASS]          = SCSI_PROT_TRANSFER_PI |
 723                                                   SCSI_PROT_GUARD_CHECK |
 724                                                   SCSI_PROT_REF_CHECK |
 725                                                   SCSI_PROT_REF_INCREMENT |
 726                                                   SCSI_PROT_IP_CHECKSUM,
 727         };
 728
 729         return flag_mask[prot_op];
 730 }
 731
 732 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
 733                                            unsigned int dix, unsigned int dif)
 734 {
 735         struct bio *bio = scmd->request->bio;
 736         unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
 737         unsigned int protect = 0;
 738
 739         if (dix) {                              /* DIX Type 0, 1, 2, 3 */
 740                 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
 741                         scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
 742
 743                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 744                         scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
 745         }
 746
 747         if (dif != T10_PI_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
 748                 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
 749
 750                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 751                         scmd->prot_flags |= SCSI_PROT_REF_CHECK;
 752         }
 753
 754         if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
 755                 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
 756
 757                 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
 758                         protect = 3 << 5;       /* Disable target PI checking */
 759                 else
 760                         protect = 1 << 5;       /* Enable target PI checking */
 761         }
 762
 763         scsi_set_prot_op(scmd, prot_op);
 764         scsi_set_prot_type(scmd, dif);
 765         scmd->prot_flags &= sd_prot_flag_mask(prot_op);
 766
 767         return protect;
 768 }
 769
 770 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 771 {
 772         struct request_queue *q = sdkp->disk->queue;
 773         unsigned int logical_block_size = sdkp->device->sector_size;
 774         unsigned int max_blocks = 0;
 775
 776         q->limits.discard_alignment =
 777                 sdkp->unmap_alignment * logical_block_size;
 778         q->limits.discard_granularity =
 779                 max(sdkp->physical_block_size,
 780                     sdkp->unmap_granularity * logical_block_size);
 781         sdkp->provisioning_mode = mode;
 782
 783         switch (mode) {
 784
 785         case SD_LBP_FULL:
 786         case SD_LBP_DISABLE:
 787                 blk_queue_max_discard_sectors(q, 0);
 788                 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
 789                 return;
 790
 791         case SD_LBP_UNMAP:
 792                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 793                                           (u32)SD_MAX_WS16_BLOCKS);
 794                 break;
 795
 796         case SD_LBP_WS16:
 797                 if (sdkp->device->unmap_limit_for_ws)
 798                         max_blocks = sdkp->max_unmap_blocks;
 799                 else
 800                         max_blocks = sdkp->max_ws_blocks;
 801
 802                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
 803                 break;
 804
 805         case SD_LBP_WS10:
 806                 if (sdkp->device->unmap_limit_for_ws)
 807                         max_blocks = sdkp->max_unmap_blocks;
 808                 else
 809                         max_blocks = sdkp->max_ws_blocks;
 810
 811                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
 812                 break;
 813
 814         case SD_LBP_ZERO:
 815                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 816                                           (u32)SD_MAX_WS10_BLOCKS);
 817                 break;
 818         }
 819
 820         blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
 821         blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 822 }
 823
 824 static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
 825 {
 826         struct scsi_device *sdp = cmd->device;
 827         struct request *rq = cmd->request;
 828         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 829         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 830         unsigned int data_len = 24;
 831         char *buf;
 832
 833         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 834         if (!rq->special_vec.bv_page)
 835                 return BLK_STS_RESOURCE;
 836         clear_highpage(rq->special_vec.bv_page);
 837         rq->special_vec.bv_offset = 0;
 838         rq->special_vec.bv_len = data_len;
 839         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 840
 841         cmd->cmd_len = 10;
 842         cmd->cmnd[0] = UNMAP;
 843         cmd->cmnd[8] = 24;
 844
 845         buf = page_address(rq->special_vec.bv_page);
 846         put_unaligned_be16(6 + 16, &buf[0]);
 847         put_unaligned_be16(16, &buf[2]);
 848         put_unaligned_be64(lba, &buf[8]);
 849         put_unaligned_be32(nr_blocks, &buf[16]);
 850
 851         cmd->allowed = SD_MAX_RETRIES;
 852         cmd->transfersize = data_len;
 853         rq->timeout = SD_TIMEOUT;
 854
 855         return scsi_init_io(cmd);
 856 }
 857
 858 static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
 859                 bool unmap)
 860 {
 861         struct scsi_device *sdp = cmd->device;
 862         struct request *rq = cmd->request;
 863         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 864         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 865         u32 data_len = sdp->sector_size;
 866
 867         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 868         if (!rq->special_vec.bv_page)
 869                 return BLK_STS_RESOURCE;
 870         clear_highpage(rq->special_vec.bv_page);
 871         rq->special_vec.bv_offset = 0;
 872         rq->special_vec.bv_len = data_len;
 873         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 874
 875         cmd->cmd_len = 16;
 876         cmd->cmnd[0] = WRITE_SAME_16;
 877         if (unmap)
 878                 cmd->cmnd[1] = 0x8; /* UNMAP */
 879         put_unaligned_be64(lba, &cmd->cmnd[2]);
 880         put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
 881
 882         cmd->allowed = SD_MAX_RETRIES;
 883         cmd->transfersize = data_len;
 884         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 885
 886         return scsi_init_io(cmd);
 887 }
 888
 889 static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
 890                 bool unmap)
 891 {
 892         struct scsi_device *sdp = cmd->device;
 893         struct request *rq = cmd->request;
 894         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 895         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 896         u32 data_len = sdp->sector_size;
 897
 898         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 899         if (!rq->special_vec.bv_page)
 900                 return BLK_STS_RESOURCE;
 901         clear_highpage(rq->special_vec.bv_page);
 902         rq->special_vec.bv_offset = 0;
 903         rq->special_vec.bv_len = data_len;
 904         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 905
 906         cmd->cmd_len = 10;
 907         cmd->cmnd[0] = WRITE_SAME;
 908         if (unmap)
 909                 cmd->cmnd[1] = 0x8; /* UNMAP */
 910         put_unaligned_be32(lba, &cmd->cmnd[2]);
 911         put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
 912
 913         cmd->allowed = SD_MAX_RETRIES;
 914         cmd->transfersize = data_len;
 915         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 916
 917         return scsi_init_io(cmd);
 918 }
 919
 920 static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
 921 {
 922         struct request *rq = cmd->request;
 923         struct scsi_device *sdp = cmd->device;
 924         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 925         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 926         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 927
 928         if (!(rq->cmd_flags & REQ_NOUNMAP)) {
 929                 switch (sdkp->zeroing_mode) {
 930                 case SD_ZERO_WS16_UNMAP:
 931                         return sd_setup_write_same16_cmnd(cmd, true);
 932                 case SD_ZERO_WS10_UNMAP:
 933                         return sd_setup_write_same10_cmnd(cmd, true);
 934                 }
 935         }
 936
 937         if (sdp->no_write_same)
 938                 return BLK_STS_TARGET;
 939
 940         if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff)
 941                 return sd_setup_write_same16_cmnd(cmd, false);
 942
 943         return sd_setup_write_same10_cmnd(cmd, false);
 944 }
 945
 946 static void sd_config_write_same(struct scsi_disk *sdkp)
 947 {
 948         struct request_queue *q = sdkp->disk->queue;
 949         unsigned int logical_block_size = sdkp->device->sector_size;
 950
 951         if (sdkp->device->no_write_same) {
 952                 sdkp->max_ws_blocks = 0;
 953                 goto out;
 954         }
 955
 956         /* Some devices can not handle block counts above 0xffff despite
 957          * supporting WRITE SAME(16). Consequently we default to 64k
 958          * blocks per I/O unless the device explicitly advertises a
 959          * bigger limit.
 960          */
 961         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 962                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 963                                                    (u32)SD_MAX_WS16_BLOCKS);
 964         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 965                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 966                                                    (u32)SD_MAX_WS10_BLOCKS);
 967         else {
 968                 sdkp->device->no_write_same = 1;
 969                 sdkp->max_ws_blocks = 0;
 970         }
 971
 972         if (sdkp->lbprz && sdkp->lbpws)
 973                 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
 974         else if (sdkp->lbprz && sdkp->lbpws10)
 975                 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
 976         else if (sdkp->max_ws_blocks)
 977                 sdkp->zeroing_mode = SD_ZERO_WS;
 978         else
 979                 sdkp->zeroing_mode = SD_ZERO_WRITE;
 980
 981         if (sdkp->max_ws_blocks &&
 982             sdkp->physical_block_size > logical_block_size) {
 983                 /*
 984                  * Reporting a maximum number of blocks that is not aligned
 985                  * on the device physical size would cause a large write same
 986                  * request to be split into physically unaligned chunks by
 987                  * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same()
 988                  * even if the caller of these functions took care to align the
 989                  * large request. So make sure the maximum reported is aligned
 990                  * to the device physical block size. This is only an optional
 991                  * optimization for regular disks, but this is mandatory to
 992                  * avoid failure of large write same requests directed at
 993                  * sequential write required zones of host-managed ZBC disks.
 994                  */
 995                 sdkp->max_ws_blocks =
 996                         round_down(sdkp->max_ws_blocks,
 997                                    bytes_to_logical(sdkp->device,
 998                                                     sdkp->physical_block_size));
 999         }
1000
1001 out:
1002         blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
1003                                          (logical_block_size >> 9));
1004         blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
1005                                          (logical_block_size >> 9));
1006 }
1007
1008 /**
1009  * sd_setup_write_same_cmnd - write the same data to multiple blocks
1010  * @cmd: command to prepare
1011  *
1012  * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
1013  * the preference indicated by the target device.
1014  **/
1015 static blk_status_t sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
1016 {
1017         struct request *rq = cmd->request;
1018         struct scsi_device *sdp = cmd->device;
1019         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
1020         struct bio *bio = rq->bio;
1021         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1022         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1023         blk_status_t ret;
1024
1025         if (sdkp->device->no_write_same)
1026                 return BLK_STS_TARGET;
1027
1028         BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
1029
1030         rq->timeout = SD_WRITE_SAME_TIMEOUT;
1031
1032         if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff) {
1033                 cmd->cmd_len = 16;
1034                 cmd->cmnd[0] = WRITE_SAME_16;
1035                 put_unaligned_be64(lba, &cmd->cmnd[2]);
1036                 put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1037         } else {
1038                 cmd->cmd_len = 10;
1039                 cmd->cmnd[0] = WRITE_SAME;
1040                 put_unaligned_be32(lba, &cmd->cmnd[2]);
1041                 put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1042         }
1043
1044         cmd->transfersize = sdp->sector_size;
1045         cmd->allowed = SD_MAX_RETRIES;
1046
1047         /*
1048          * For WRITE SAME the data transferred via the DATA OUT buffer is
1049          * different from the amount of data actually written to the target.
1050          *
1051          * We set up __data_len to the amount of data transferred via the
1052          * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
1053          * to transfer a single sector of data first, but then reset it to
1054          * the amount of data to be written right after so that the I/O path
1055          * knows how much to actually write.
1056          */
1057         rq->__data_len = sdp->sector_size;
1058         ret = scsi_init_io(cmd);
1059         rq->__data_len = blk_rq_bytes(rq);
1060
1061         return ret;
1062 }
1063
1064 static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
1065 {
1066         struct request *rq = cmd->request;
1067
1068         /* flush requests don't perform I/O, zero the S/G table */
1069         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1070
1071         cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1072         cmd->cmd_len = 10;
1073         cmd->transfersize = 0;
1074         cmd->allowed = SD_MAX_RETRIES;
1075
1076         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1077         return BLK_STS_OK;
1078 }
1079
1080 static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
1081                                        sector_t lba, unsigned int nr_blocks,
1082                                        unsigned char flags)
1083 {
1084         cmd->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1085         if (unlikely(cmd->cmnd == NULL))
1086                 return BLK_STS_RESOURCE;
1087
1088         cmd->cmd_len = SD_EXT_CDB_SIZE;
1089         memset(cmd->cmnd, 0, cmd->cmd_len);
1090
1091         cmd->cmnd[0]  = VARIABLE_LENGTH_CMD;
1092         cmd->cmnd[7]  = 0x18; /* Additional CDB len */
1093         cmd->cmnd[9]  = write ? WRITE_32 : READ_32;
1094         cmd->cmnd[10] = flags;
1095         put_unaligned_be64(lba, &cmd->cmnd[12]);
1096         put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */
1097         put_unaligned_be32(nr_blocks, &cmd->cmnd[28]);
1098
1099         return BLK_STS_OK;
1100 }
1101
1102 static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
1103                                        sector_t lba, unsigned int nr_blocks,
1104                                        unsigned char flags)
1105 {
1106         cmd->cmd_len  = 16;
1107         cmd->cmnd[0]  = write ? WRITE_16 : READ_16;
1108         cmd->cmnd[1]  = flags;
1109         cmd->cmnd[14] = 0;
1110         cmd->cmnd[15] = 0;
1111         put_unaligned_be64(lba, &cmd->cmnd[2]);
1112         put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1113
1114         return BLK_STS_OK;
1115 }
1116
1117 static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
1118                                        sector_t lba, unsigned int nr_blocks,
1119                                        unsigned char flags)
1120 {
1121         cmd->cmd_len = 10;
1122         cmd->cmnd[0] = write ? WRITE_10 : READ_10;
1123         cmd->cmnd[1] = flags;
1124         cmd->cmnd[6] = 0;
1125         cmd->cmnd[9] = 0;
1126         put_unaligned_be32(lba, &cmd->cmnd[2]);
1127         put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1128
1129         return BLK_STS_OK;
1130 }
1131
1132 static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
1133                                       sector_t lba, unsigned int nr_blocks,
1134                                       unsigned char flags)
1135 {
1136         /* Avoid that 0 blocks gets translated into 256 blocks. */
1137         if (WARN_ON_ONCE(nr_blocks == 0))
1138                 return BLK_STS_IOERR;
1139
1140         if (unlikely(flags & 0x8)) {
1141                 /*
1142                  * This happens only if this drive failed 10byte rw
1143                  * command with ILLEGAL_REQUEST during operation and
1144                  * thus turned off use_10_for_rw.
1145                  */
1146                 scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
1147                 return BLK_STS_IOERR;
1148         }
1149
1150         cmd->cmd_len = 6;
1151         cmd->cmnd[0] = write ? WRITE_6 : READ_6;
1152         cmd->cmnd[1] = (lba >> 16) & 0x1f;
1153         cmd->cmnd[2] = (lba >> 8) & 0xff;
1154         cmd->cmnd[3] = lba & 0xff;
1155         cmd->cmnd[4] = nr_blocks;
1156         cmd->cmnd[5] = 0;
1157
1158         return BLK_STS_OK;
1159 }
1160
1161 static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
1162 {
1163         struct request *rq = cmd->request;
1164         struct scsi_device *sdp = cmd->device;
1165         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
1166         sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1167         sector_t threshold;
1168         unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1169         bool dif, dix;
1170         unsigned int mask = logical_to_sectors(sdp, 1) - 1;
1171         bool write = rq_data_dir(rq) == WRITE;
1172         unsigned char protect, fua;
1173         blk_status_t ret;
1174
1175         ret = scsi_init_io(cmd);
1176         if (ret != BLK_STS_OK)
1177                 return ret;
1178
1179         if (!scsi_device_online(sdp) || sdp->changed) {
1180                 scmd_printk(KERN_ERR, cmd, "device offline or changed\n");
1181                 return BLK_STS_IOERR;
1182         }
1183
1184         if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->rq_disk)) {
1185                 scmd_printk(KERN_ERR, cmd, "access beyond end of device\n");
1186                 return BLK_STS_IOERR;
1187         }
1188
1189         if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) {
1190                 scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n");
1191                 return BLK_STS_IOERR;
1192         }
1193
1194         /*
1195          * Some SD card readers can't handle accesses which touch the
1196          * last one or two logical blocks. Split accesses as needed.
1197          */
1198         threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS;
1199
1200         if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) {
1201                 if (lba < threshold) {
1202                         /* Access up to the threshold but not beyond */
1203                         nr_blocks = threshold - lba;
1204                 } else {
1205                         /* Access only a single logical block */
1206                         nr_blocks = 1;
1207                 }
1208         }
1209
1210         fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
1211         dix = scsi_prot_sg_count(cmd);
1212         dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type);
1213
1214         if (dif || dix)
1215                 protect = sd_setup_protect_cmnd(cmd, dix, dif);
1216         else
1217                 protect = 0;
1218
1219         if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1220                 ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
1221                                          protect | fua);
1222         } else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
1223                 ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
1224                                          protect | fua);
1225         } else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
1226                    sdp->use_10_for_rw || protect) {
1227                 ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
1228                                          protect | fua);
1229         } else {
1230                 ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
1231                                         protect | fua);
1232         }
1233
1234         if (unlikely(ret != BLK_STS_OK))
1235                 return ret;
1236
1237         /*
1238          * We shouldn't disconnect in the middle of a sector, so with a dumb
1239          * host adapter, it's safe to assume that we can at least transfer
1240          * this many bytes between each connect / disconnect.
1241          */
1242         cmd->transfersize = sdp->sector_size;
1243         cmd->underflow = nr_blocks << 9;
1244         cmd->allowed = SD_MAX_RETRIES;
1245         cmd->sdb.length = nr_blocks * sdp->sector_size;
1246
1247         SCSI_LOG_HLQUEUE(1,
1248                          scmd_printk(KERN_INFO, cmd,
1249                                      "%s: block=%llu, count=%d\n", __func__,
1250                                      (unsigned long long)blk_rq_pos(rq),
1251                                      blk_rq_sectors(rq)));
1252         SCSI_LOG_HLQUEUE(2,
1253                          scmd_printk(KERN_INFO, cmd,
1254                                      "%s %d/%u 512 byte blocks.\n",
1255                                      write ? "writing" : "reading", nr_blocks,
1256                                      blk_rq_sectors(rq)));
1257
1258         /*
1259          * This indicates that the command is ready from our end to be
1260          * queued.
1261          */
1262         return BLK_STS_OK;
1263 }
1264
1265 static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
1266 {
1267         struct request *rq = cmd->request;
1268
1269         switch (req_op(rq)) {
1270         case REQ_OP_DISCARD:
1271                 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1272                 case SD_LBP_UNMAP:
1273                         return sd_setup_unmap_cmnd(cmd);
1274                 case SD_LBP_WS16:
1275                         return sd_setup_write_same16_cmnd(cmd, true);
1276                 case SD_LBP_WS10:
1277                         return sd_setup_write_same10_cmnd(cmd, true);
1278                 case SD_LBP_ZERO:
1279                         return sd_setup_write_same10_cmnd(cmd, false);
1280                 default:
1281                         return BLK_STS_TARGET;
1282                 }
1283         case REQ_OP_WRITE_ZEROES:
1284                 return sd_setup_write_zeroes_cmnd(cmd);
1285         case REQ_OP_WRITE_SAME:
1286                 return sd_setup_write_same_cmnd(cmd);
1287         case REQ_OP_FLUSH:
1288                 return sd_setup_flush_cmnd(cmd);
1289         case REQ_OP_READ:
1290         case REQ_OP_WRITE:
1291                 return sd_setup_read_write_cmnd(cmd);
1292         case REQ_OP_ZONE_RESET:
1293                 return sd_zbc_setup_reset_cmnd(cmd, false);
1294         case REQ_OP_ZONE_RESET_ALL:
1295                 return sd_zbc_setup_reset_cmnd(cmd, true);
1296         default:
1297                 WARN_ON_ONCE(1);
1298                 return BLK_STS_NOTSUPP;
1299         }
1300 }
1301
1302 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1303 {
1304         struct request *rq = SCpnt->request;
1305         u8 *cmnd;
1306
1307         if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1308                 mempool_free(rq->special_vec.bv_page, sd_page_pool);
1309
1310         if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1311                 cmnd = SCpnt->cmnd;
1312                 SCpnt->cmnd = NULL;
1313                 SCpnt->cmd_len = 0;
1314                 mempool_free(cmnd, sd_cdb_pool);
1315         }
1316 }
1317
1318 /**
1319  *      sd_open - open a scsi disk device
1320  *      @bdev: Block device of the scsi disk to open
1321  *      @mode: FMODE_* mask
1322  *
1323  *      Returns 0 if successful. Returns a negated errno value in case
1324  *      of error.
1325  *
1326  *      Note: This can be called from a user context (e.g. fsck(1) )
1327  *      or from within the kernel (e.g. as a result of a mount(1) ).
1328  *      In the latter case @inode and @filp carry an abridged amount
1329  *      of information as noted above.
1330  *
1331  *      Locking: called with bdev->bd_mutex held.
1332  **/
1333 static int sd_open(struct block_device *bdev, fmode_t mode)
1334 {
1335         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1336         struct scsi_device *sdev;
1337         int retval;
1338
1339         if (!sdkp)
1340                 return -ENXIO;
1341
1342         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1343
1344         sdev = sdkp->device;
1345
1346         /*
1347          * If the device is in error recovery, wait until it is done.
1348          * If the device is offline, then disallow any access to it.
1349          */
1350         retval = -ENXIO;
1351         if (!scsi_block_when_processing_errors(sdev))
1352                 goto error_out;
1353
1354         if (sdev->removable || sdkp->write_prot)
1355                 check_disk_change(bdev);
1356
1357         /*
1358          * If the drive is empty, just let the open fail.
1359          */
1360         retval = -ENOMEDIUM;
1361         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1362                 goto error_out;
1363
1364         /*
1365          * If the device has the write protect tab set, have the open fail
1366          * if the user expects to be able to write to the thing.
1367          */
1368         retval = -EROFS;
1369         if (sdkp->write_prot && (mode & FMODE_WRITE))
1370                 goto error_out;
1371
1372         /*
1373          * It is possible that the disk changing stuff resulted in
1374          * the device being taken offline.  If this is the case,
1375          * report this to the user, and don't pretend that the
1376          * open actually succeeded.
1377          */
1378         retval = -ENXIO;
1379         if (!scsi_device_online(sdev))
1380                 goto error_out;
1381
1382         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1383                 if (scsi_block_when_processing_errors(sdev))
1384                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1385         }
1386
1387         return 0;
1388
1389 error_out:
1390         scsi_disk_put(sdkp);
1391         return retval;
1392 }
1393
1394 /**
1395  *      sd_release - invoked when the (last) close(2) is called on this
1396  *      scsi disk.
1397  *      @disk: disk to release
1398  *      @mode: FMODE_* mask
1399  *
1400  *      Returns 0.
1401  *
1402  *      Note: may block (uninterruptible) if error recovery is underway
1403  *      on this disk.
1404  *
1405  *      Locking: called with bdev->bd_mutex held.
1406  **/
1407 static void sd_release(struct gendisk *disk, fmode_t mode)
1408 {
1409         struct scsi_disk *sdkp = scsi_disk(disk);
1410         struct scsi_device *sdev = sdkp->device;
1411
1412         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1413
1414         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1415                 if (scsi_block_when_processing_errors(sdev))
1416                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1417         }
1418
1419         scsi_disk_put(sdkp);
1420 }
1421
1422 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1423 {
1424         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1425         struct scsi_device *sdp = sdkp->device;
1426         struct Scsi_Host *host = sdp->host;
1427         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1428         int diskinfo[4];
1429
1430         /* default to most commonly used values */
1431         diskinfo[0] = 0x40;     /* 1 << 6 */
1432         diskinfo[1] = 0x20;     /* 1 << 5 */
1433         diskinfo[2] = capacity >> 11;
1434
1435         /* override with calculated, extended default, or driver values */
1436         if (host->hostt->bios_param)
1437                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1438         else
1439                 scsicam_bios_param(bdev, capacity, diskinfo);
1440
1441         geo->heads = diskinfo[0];
1442         geo->sectors = diskinfo[1];
1443         geo->cylinders = diskinfo[2];
1444         return 0;
1445 }
1446
1447 /**
1448  *      sd_ioctl - process an ioctl
1449  *      @bdev: target block device
1450  *      @mode: FMODE_* mask
1451  *      @cmd: ioctl command number
1452  *      @arg: this is third argument given to ioctl(2) system call.
1453  *      Often contains a pointer.
1454  *
1455  *      Returns 0 if successful (some ioctls return positive numbers on
1456  *      success as well). Returns a negated errno value in case of error.
1457  *
1458  *      Note: most ioctls are forward onto the block subsystem or further
1459  *      down in the scsi subsystem.
1460  **/
1461 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1462                     unsigned int cmd, unsigned long arg)
1463 {
1464         struct gendisk *disk = bdev->bd_disk;
1465         struct scsi_disk *sdkp = scsi_disk(disk);
1466         struct scsi_device *sdp = sdkp->device;
1467         void __user *p = (void __user *)arg;
1468         int error;
1469
1470         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1471                                     "cmd=0x%x\n", disk->disk_name, cmd));
1472
1473         error = scsi_verify_blk_ioctl(bdev, cmd);
1474         if (error < 0)
1475                 return error;
1476
1477         /*
1478          * If we are in the middle of error recovery, don't let anyone
1479          * else try and use this device.  Also, if error recovery fails, it
1480          * may try and take the device offline, in which case all further
1481          * access to the device is prohibited.
1482          */
1483         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1484                         (mode & FMODE_NDELAY) != 0);
1485         if (error)
1486                 goto out;
1487
1488         if (is_sed_ioctl(cmd))
1489                 return sed_ioctl(sdkp->opal_dev, cmd, p);
1490
1491         /*
1492          * Send SCSI addressing ioctls directly to mid level, send other
1493          * ioctls to block level and then onto mid level if they can't be
1494          * resolved.
1495          */
1496         switch (cmd) {
1497                 case SCSI_IOCTL_GET_IDLUN:
1498                 case SCSI_IOCTL_GET_BUS_NUMBER:
1499                         error = scsi_ioctl(sdp, cmd, p);
1500                         break;
1501                 default:
1502                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1503                         if (error != -ENOTTY)
1504                                 break;
1505                         error = scsi_ioctl(sdp, cmd, p);
1506                         break;
1507         }
1508 out:
1509         return error;
1510 }
1511
1512 static void set_media_not_present(struct scsi_disk *sdkp)
1513 {
1514         if (sdkp->media_present)
1515                 sdkp->device->changed = 1;
1516
1517         if (sdkp->device->removable) {
1518                 sdkp->media_present = 0;
1519                 sdkp->capacity = 0;
1520         }
1521 }
1522
1523 static int media_not_present(struct scsi_disk *sdkp,
1524                              struct scsi_sense_hdr *sshdr)
1525 {
1526         if (!scsi_sense_valid(sshdr))
1527                 return 0;
1528
1529         /* not invoked for commands that could return deferred errors */
1530         switch (sshdr->sense_key) {
1531         case UNIT_ATTENTION:
1532         case NOT_READY:
1533                 /* medium not present */
1534                 if (sshdr->asc == 0x3A) {
1535                         set_media_not_present(sdkp);
1536                         return 1;
1537                 }
1538         }
1539         return 0;
1540 }
1541
1542 /**
1543  *      sd_check_events - check media events
1544  *      @disk: kernel device descriptor
1545  *      @clearing: disk events currently being cleared
1546  *
1547  *      Returns mask of DISK_EVENT_*.
1548  *
1549  *      Note: this function is invoked from the block subsystem.
1550  **/
1551 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1552 {
1553         struct scsi_disk *sdkp = scsi_disk_get(disk);
1554         struct scsi_device *sdp;
1555         int retval;
1556
1557         if (!sdkp)
1558                 return 0;
1559
1560         sdp = sdkp->device;
1561         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1562
1563         /*
1564          * If the device is offline, don't send any commands - just pretend as
1565          * if the command failed.  If the device ever comes back online, we
1566          * can deal with it then.  It is only because of unrecoverable errors
1567          * that we would ever take a device offline in the first place.
1568          */
1569         if (!scsi_device_online(sdp)) {
1570                 set_media_not_present(sdkp);
1571                 goto out;
1572         }
1573
1574         /*
1575          * Using TEST_UNIT_READY enables differentiation between drive with
1576          * no cartridge loaded - NOT READY, drive with changed cartridge -
1577          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1578          *
1579          * Drives that auto spin down. eg iomega jaz 1G, will be started
1580          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1581          * sd_revalidate() is called.
1582          */
1583         if (scsi_block_when_processing_errors(sdp)) {
1584                 struct scsi_sense_hdr sshdr = { 0, };
1585
1586                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1587                                               &sshdr);
1588
1589                 /* failed to execute TUR, assume media not present */
1590                 if (host_byte(retval)) {
1591                         set_media_not_present(sdkp);
1592                         goto out;
1593                 }
1594
1595                 if (media_not_present(sdkp, &sshdr))
1596                         goto out;
1597         }
1598
1599         /*
1600          * For removable scsi disk we have to recognise the presence
1601          * of a disk in the drive.
1602          */
1603         if (!sdkp->media_present)
1604                 sdp->changed = 1;
1605         sdkp->media_present = 1;
1606 out:
1607         /*
1608          * sdp->changed is set under the following conditions:
1609          *
1610          *      Medium present state has changed in either direction.
1611          *      Device has indicated UNIT_ATTENTION.
1612          */
1613         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1614         sdp->changed = 0;
1615         scsi_disk_put(sdkp);
1616         return retval;
1617 }
1618
1619 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1620 {
1621         int retries, res;
1622         struct scsi_device *sdp = sdkp->device;
1623         const int timeout = sdp->request_queue->rq_timeout
1624                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1625         struct scsi_sense_hdr my_sshdr;
1626
1627         if (!scsi_device_online(sdp))
1628                 return -ENODEV;
1629
1630         /* caller might not be interested in sense, but we need it */
1631         if (!sshdr)
1632                 sshdr = &my_sshdr;
1633
1634         for (retries = 3; retries > 0; --retries) {
1635                 unsigned char cmd[10] = { 0 };
1636
1637                 cmd[0] = SYNCHRONIZE_CACHE;
1638                 /*
1639                  * Leave the rest of the command zero to indicate
1640                  * flush everything.
1641                  */
1642                 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1643                                 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1644                 if (res == 0)
1645                         break;
1646         }
1647
1648         if (res) {
1649                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1650
1651                 if (driver_byte(res) == DRIVER_SENSE)
1652                         sd_print_sense_hdr(sdkp, sshdr);
1653
1654                 /* we need to evaluate the error return  */
1655                 if (scsi_sense_valid(sshdr) &&
1656                         (sshdr->asc == 0x3a ||  /* medium not present */
1657                          sshdr->asc == 0x20 ||  /* invalid command */
1658                          (sshdr->asc == 0x74 && sshdr->ascq == 0x71)))  /* drive is password locked */
1659                                 /* this is no error here */
1660                                 return 0;
1661
1662                 switch (host_byte(res)) {
1663                 /* ignore errors due to racing a disconnection */
1664                 case DID_BAD_TARGET:
1665                 case DID_NO_CONNECT:
1666                         return 0;
1667                 /* signal the upper layer it might try again */
1668                 case DID_BUS_BUSY:
1669                 case DID_IMM_RETRY:
1670                 case DID_REQUEUE:
1671                 case DID_SOFT_ERROR:
1672                         return -EBUSY;
1673                 default:
1674                         return -EIO;
1675                 }
1676         }
1677         return 0;
1678 }
1679
1680 static void sd_rescan(struct device *dev)
1681 {
1682         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1683
1684         revalidate_disk(sdkp->disk);
1685 }
1686
1687
1688 #ifdef CONFIG_COMPAT
1689 /*
1690  * This gets directly called from VFS. When the ioctl
1691  * is not recognized we go back to the other translation paths.
1692  */
1693 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1694                            unsigned int cmd, unsigned long arg)
1695 {
1696         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1697         int error;
1698
1699         error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1700                         (mode & FMODE_NDELAY) != 0);
1701         if (error)
1702                 return error;
1703
1704         /*
1705          * Let the static ioctl translation table take care of it.
1706          */
1707         if (!sdev->host->hostt->compat_ioctl)
1708                 return -ENOIOCTLCMD;
1709         return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1710 }
1711 #endif
1712
1713 static char sd_pr_type(enum pr_type type)
1714 {
1715         switch (type) {
1716         case PR_WRITE_EXCLUSIVE:
1717                 return 0x01;
1718         case PR_EXCLUSIVE_ACCESS:
1719                 return 0x03;
1720         case PR_WRITE_EXCLUSIVE_REG_ONLY:
1721                 return 0x05;
1722         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1723                 return 0x06;
1724         case PR_WRITE_EXCLUSIVE_ALL_REGS:
1725                 return 0x07;
1726         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1727                 return 0x08;
1728         default:
1729                 return 0;
1730         }
1731 };
1732
1733 static int sd_pr_command(struct block_device *bdev, u8 sa,
1734                 u64 key, u64 sa_key, u8 type, u8 flags)
1735 {
1736         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1737         struct scsi_sense_hdr sshdr;
1738         int result;
1739         u8 cmd[16] = { 0, };
1740         u8 data[24] = { 0, };
1741
1742         cmd[0] = PERSISTENT_RESERVE_OUT;
1743         cmd[1] = sa;
1744         cmd[2] = type;
1745         put_unaligned_be32(sizeof(data), &cmd[5]);
1746
1747         put_unaligned_be64(key, &data[0]);
1748         put_unaligned_be64(sa_key, &data[8]);
1749         data[20] = flags;
1750
1751         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1752                         &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1753
1754         if (driver_byte(result) == DRIVER_SENSE &&
1755             scsi_sense_valid(&sshdr)) {
1756                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1757                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1758         }
1759
1760         return result;
1761 }
1762
1763 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1764                 u32 flags)
1765 {
1766         if (flags & ~PR_FL_IGNORE_KEY)
1767                 return -EOPNOTSUPP;
1768         return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1769                         old_key, new_key, 0,
1770                         (1 << 0) /* APTPL */);
1771 }
1772
1773 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1774                 u32 flags)
1775 {
1776         if (flags)
1777                 return -EOPNOTSUPP;
1778         return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1779 }
1780
1781 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1782 {
1783         return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1784 }
1785
1786 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1787                 enum pr_type type, bool abort)
1788 {
1789         return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1790                              sd_pr_type(type), 0);
1791 }
1792
1793 static int sd_pr_clear(struct block_device *bdev, u64 key)
1794 {
1795         return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1796 }
1797
1798 static const struct pr_ops sd_pr_ops = {
1799         .pr_register    = sd_pr_register,
1800         .pr_reserve     = sd_pr_reserve,
1801         .pr_release     = sd_pr_release,
1802         .pr_preempt     = sd_pr_preempt,
1803         .pr_clear       = sd_pr_clear,
1804 };
1805
1806 static const struct block_device_operations sd_fops = {
1807         .owner                  = THIS_MODULE,
1808         .open                   = sd_open,
1809         .release                = sd_release,
1810         .ioctl                  = sd_ioctl,
1811         .getgeo                 = sd_getgeo,
1812 #ifdef CONFIG_COMPAT
1813         .compat_ioctl           = sd_compat_ioctl,
1814 #endif
1815         .check_events           = sd_check_events,
1816         .revalidate_disk        = sd_revalidate_disk,
1817         .unlock_native_capacity = sd_unlock_native_capacity,
1818         .report_zones           = sd_zbc_report_zones,
1819         .pr_ops                 = &sd_pr_ops,
1820 };
1821
1822 /**
1823  *      sd_eh_reset - reset error handling callback
1824  *      @scmd:          sd-issued command that has failed
1825  *
1826  *      This function is called by the SCSI midlayer before starting
1827  *      SCSI EH. When counting medium access failures we have to be
1828  *      careful to register it only only once per device and SCSI EH run;
1829  *      there might be several timed out commands which will cause the
1830  *      'max_medium_access_timeouts' counter to trigger after the first
1831  *      SCSI EH run already and set the device to offline.
1832  *      So this function resets the internal counter before starting SCSI EH.
1833  **/
1834 static void sd_eh_reset(struct scsi_cmnd *scmd)
1835 {
1836         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1837
1838         /* New SCSI EH run, reset gate variable */
1839         sdkp->ignore_medium_access_errors = false;
1840 }
1841
1842 /**
1843  *      sd_eh_action - error handling callback
1844  *      @scmd:          sd-issued command that has failed
1845  *      @eh_disp:       The recovery disposition suggested by the midlayer
1846  *
1847  *      This function is called by the SCSI midlayer upon completion of an
1848  *      error test command (currently TEST UNIT READY). The result of sending
1849  *      the eh command is passed in eh_disp.  We're looking for devices that
1850  *      fail medium access commands but are OK with non access commands like
1851  *      test unit ready (so wrongly see the device as having a successful
1852  *      recovery)
1853  **/
1854 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1855 {
1856         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1857         struct scsi_device *sdev = scmd->device;
1858
1859         if (!scsi_device_online(sdev) ||
1860             !scsi_medium_access_command(scmd) ||
1861             host_byte(scmd->result) != DID_TIME_OUT ||
1862             eh_disp != SUCCESS)
1863                 return eh_disp;
1864
1865         /*
1866          * The device has timed out executing a medium access command.
1867          * However, the TEST UNIT READY command sent during error
1868          * handling completed successfully. Either the device is in the
1869          * process of recovering or has it suffered an internal failure
1870          * that prevents access to the storage medium.
1871          */
1872         if (!sdkp->ignore_medium_access_errors) {
1873                 sdkp->medium_access_timed_out++;
1874                 sdkp->ignore_medium_access_errors = true;
1875         }
1876
1877         /*
1878          * If the device keeps failing read/write commands but TEST UNIT
1879          * READY always completes successfully we assume that medium
1880          * access is no longer possible and take the device offline.
1881          */
1882         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1883                 scmd_printk(KERN_ERR, scmd,
1884                             "Medium access timeout failure. Offlining disk!\n");
1885                 mutex_lock(&sdev->state_mutex);
1886                 scsi_device_set_state(sdev, SDEV_OFFLINE);
1887                 mutex_unlock(&sdev->state_mutex);
1888
1889                 return SUCCESS;
1890         }
1891
1892         return eh_disp;
1893 }
1894
1895 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1896 {
1897         struct request *req = scmd->request;
1898         struct scsi_device *sdev = scmd->device;
1899         unsigned int transferred, good_bytes;
1900         u64 start_lba, end_lba, bad_lba;
1901
1902         /*
1903          * Some commands have a payload smaller than the device logical
1904          * block size (e.g. INQUIRY on a 4K disk).
1905          */
1906         if (scsi_bufflen(scmd) <= sdev->sector_size)
1907                 return 0;
1908
1909         /* Check if we have a 'bad_lba' information */
1910         if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1911                                      SCSI_SENSE_BUFFERSIZE,
1912                                      &bad_lba))
1913                 return 0;
1914
1915         /*
1916          * If the bad lba was reported incorrectly, we have no idea where
1917          * the error is.
1918          */
1919         start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1920         end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1921         if (bad_lba < start_lba || bad_lba >= end_lba)
1922                 return 0;
1923
1924         /*
1925          * resid is optional but mostly filled in.  When it's unused,
1926          * its value is zero, so we assume the whole buffer transferred
1927          */
1928         transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1929
1930         /* This computation should always be done in terms of the
1931          * resolution of the device's medium.
1932          */
1933         good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1934
1935         return min(good_bytes, transferred);
1936 }
1937
1938 /**
1939  *      sd_done - bottom half handler: called when the lower level
1940  *      driver has completed (successfully or otherwise) a scsi command.
1941  *      @SCpnt: mid-level's per command structure.
1942  *
1943  *      Note: potentially run from within an ISR. Must not block.
1944  **/
1945 static int sd_done(struct scsi_cmnd *SCpnt)
1946 {
1947         int result = SCpnt->result;
1948         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1949         unsigned int sector_size = SCpnt->device->sector_size;
1950         unsigned int resid;
1951         struct scsi_sense_hdr sshdr;
1952         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1953         struct request *req = SCpnt->request;
1954         int sense_valid = 0;
1955         int sense_deferred = 0;
1956
1957         switch (req_op(req)) {
1958         case REQ_OP_DISCARD:
1959         case REQ_OP_WRITE_ZEROES:
1960         case REQ_OP_WRITE_SAME:
1961         case REQ_OP_ZONE_RESET:
1962         case REQ_OP_ZONE_RESET_ALL:
1963                 if (!result) {
1964                         good_bytes = blk_rq_bytes(req);
1965                         scsi_set_resid(SCpnt, 0);
1966                 } else {
1967                         good_bytes = 0;
1968                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1969                 }
1970                 break;
1971         default:
1972                 /*
1973                  * In case of bogus fw or device, we could end up having
1974                  * an unaligned partial completion. Check this here and force
1975                  * alignment.
1976                  */
1977                 resid = scsi_get_resid(SCpnt);
1978                 if (resid & (sector_size - 1)) {
1979                         sd_printk(KERN_INFO, sdkp,
1980                                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1981                                 resid, sector_size);
1982                         scsi_print_command(SCpnt);
1983                         resid = min(scsi_bufflen(SCpnt),
1984                                     round_up(resid, sector_size));
1985                         scsi_set_resid(SCpnt, resid);
1986                 }
1987         }
1988
1989         if (result) {
1990                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1991                 if (sense_valid)
1992                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1993         }
1994         sdkp->medium_access_timed_out = 0;
1995
1996         if (driver_byte(result) != DRIVER_SENSE &&
1997             (!sense_valid || sense_deferred))
1998                 goto out;
1999
2000         switch (sshdr.sense_key) {
2001         case HARDWARE_ERROR:
2002         case MEDIUM_ERROR:
2003                 good_bytes = sd_completed_bytes(SCpnt);
2004                 break;
2005         case RECOVERED_ERROR:
2006                 good_bytes = scsi_bufflen(SCpnt);
2007                 break;
2008         case NO_SENSE:
2009                 /* This indicates a false check condition, so ignore it.  An
2010                  * unknown amount of data was transferred so treat it as an
2011                  * error.
2012                  */
2013                 SCpnt->result = 0;
2014                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2015                 break;
2016         case ABORTED_COMMAND:
2017                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
2018                         good_bytes = sd_completed_bytes(SCpnt);
2019                 break;
2020         case ILLEGAL_REQUEST:
2021                 switch (sshdr.asc) {
2022                 case 0x10:      /* DIX: Host detected corruption */
2023                         good_bytes = sd_completed_bytes(SCpnt);
2024                         break;
2025                 case 0x20:      /* INVALID COMMAND OPCODE */
2026                 case 0x24:      /* INVALID FIELD IN CDB */
2027                         switch (SCpnt->cmnd[0]) {
2028                         case UNMAP:
2029                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2030                                 break;
2031                         case WRITE_SAME_16:
2032                         case WRITE_SAME:
2033                                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2034                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
2035                                 } else {
2036                                         sdkp->device->no_write_same = 1;
2037                                         sd_config_write_same(sdkp);
2038                                         req->rq_flags |= RQF_QUIET;
2039                                 }
2040                                 break;
2041                         }
2042                 }
2043                 break;
2044         default:
2045                 break;
2046         }
2047
2048  out:
2049         if (sd_is_zoned(sdkp))
2050                 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2051
2052         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2053                                            "sd_done: completed %d of %d bytes\n",
2054                                            good_bytes, scsi_bufflen(SCpnt)));
2055
2056         return good_bytes;
2057 }
2058
2059 /*
2060  * spinup disk - called only in sd_revalidate_disk()
2061  */
2062 static void
2063 sd_spinup_disk(struct scsi_disk *sdkp)
2064 {
2065         unsigned char cmd[10];
2066         unsigned long spintime_expire = 0;
2067         int retries, spintime;
2068         unsigned int the_result;
2069         struct scsi_sense_hdr sshdr;
2070         int sense_valid = 0;
2071
2072         spintime = 0;
2073
2074         /* Spin up drives, as required.  Only do this at boot time */
2075         /* Spinup needs to be done for module loads too. */
2076         do {
2077                 retries = 0;
2078
2079                 do {
2080                         cmd[0] = TEST_UNIT_READY;
2081                         memset((void *) &cmd[1], 0, 9);
2082
2083                         the_result = scsi_execute_req(sdkp->device, cmd,
2084                                                       DMA_NONE, NULL, 0,
2085                                                       &sshdr, SD_TIMEOUT,
2086                                                       SD_MAX_RETRIES, NULL);
2087
2088                         /*
2089                          * If the drive has indicated to us that it
2090                          * doesn't have any media in it, don't bother
2091                          * with any more polling.
2092                          */
2093                         if (media_not_present(sdkp, &sshdr))
2094                                 return;
2095
2096                         if (the_result)
2097                                 sense_valid = scsi_sense_valid(&sshdr);
2098                         retries++;
2099                 } while (retries < 3 &&
2100                          (!scsi_status_is_good(the_result) ||
2101                           ((driver_byte(the_result) == DRIVER_SENSE) &&
2102                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2103
2104                 if (driver_byte(the_result) != DRIVER_SENSE) {
2105                         /* no sense, TUR either succeeded or failed
2106                          * with a status error */
2107                         if(!spintime && !scsi_status_is_good(the_result)) {
2108                                 sd_print_result(sdkp, "Test Unit Ready failed",
2109                                                 the_result);
2110                         }
2111                         break;
2112                 }
2113
2114                 /*
2115                  * The device does not want the automatic start to be issued.
2116                  */
2117                 if (sdkp->device->no_start_on_add)
2118                         break;
2119
2120                 if (sense_valid && sshdr.sense_key == NOT_READY) {
2121                         if (sshdr.asc == 4 && sshdr.ascq == 3)
2122                                 break;  /* manual intervention required */
2123                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2124                                 break;  /* standby */
2125                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2126                                 break;  /* unavailable */
2127                         if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2128                                 break;  /* sanitize in progress */
2129                         /*
2130                          * Issue command to spin up drive when not ready
2131                          */
2132                         if (!spintime) {
2133                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2134                                 cmd[0] = START_STOP;
2135                                 cmd[1] = 1;     /* Return immediately */
2136                                 memset((void *) &cmd[2], 0, 8);
2137                                 cmd[4] = 1;     /* Start spin cycle */
2138                                 if (sdkp->device->start_stop_pwr_cond)
2139                                         cmd[4] |= 1 << 4;
2140                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2141                                                  NULL, 0, &sshdr,
2142                                                  SD_TIMEOUT, SD_MAX_RETRIES,
2143                                                  NULL);
2144                                 spintime_expire = jiffies + 100 * HZ;
2145                                 spintime = 1;
2146                         }
2147                         /* Wait 1 second for next try */
2148                         msleep(1000);
2149                         printk(KERN_CONT ".");
2150
2151                 /*
2152                  * Wait for USB flash devices with slow firmware.
2153                  * Yes, this sense key/ASC combination shouldn't
2154                  * occur here.  It's characteristic of these devices.
2155                  */
2156                 } else if (sense_valid &&
2157                                 sshdr.sense_key == UNIT_ATTENTION &&
2158                                 sshdr.asc == 0x28) {
2159                         if (!spintime) {
2160                                 spintime_expire = jiffies + 5 * HZ;
2161                                 spintime = 1;
2162                         }
2163                         /* Wait 1 second for next try */
2164                         msleep(1000);
2165                 } else {
2166                         /* we don't understand the sense code, so it's
2167                          * probably pointless to loop */
2168                         if(!spintime) {
2169                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2170                                 sd_print_sense_hdr(sdkp, &sshdr);
2171                         }
2172                         break;
2173                 }
2174
2175         } while (spintime && time_before_eq(jiffies, spintime_expire));
2176
2177         if (spintime) {
2178                 if (scsi_status_is_good(the_result))
2179                         printk(KERN_CONT "ready\n");
2180                 else
2181                         printk(KERN_CONT "not responding...\n");
2182         }
2183 }
2184
2185 /*
2186  * Determine whether disk supports Data Integrity Field.
2187  */
2188 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2189 {
2190         struct scsi_device *sdp = sdkp->device;
2191         u8 type;
2192         int ret = 0;
2193
2194         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2195                 return ret;
2196
2197         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2198
2199         if (type > T10_PI_TYPE3_PROTECTION)
2200                 ret = -ENODEV;
2201         else if (scsi_host_dif_capable(sdp->host, type))
2202                 ret = 1;
2203
2204         if (sdkp->first_scan || type != sdkp->protection_type)
2205                 switch (ret) {
2206                 case -ENODEV:
2207                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2208                                   " protection type %u. Disabling disk!\n",
2209                                   type);
2210                         break;
2211                 case 1:
2212                         sd_printk(KERN_NOTICE, sdkp,
2213                                   "Enabling DIF Type %u protection\n", type);
2214                         break;
2215                 case 0:
2216                         sd_printk(KERN_NOTICE, sdkp,
2217                                   "Disabling DIF Type %u protection\n", type);
2218                         break;
2219                 }
2220
2221         sdkp->protection_type = type;
2222
2223         return ret;
2224 }
2225
2226 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2227                         struct scsi_sense_hdr *sshdr, int sense_valid,
2228                         int the_result)
2229 {
2230         if (driver_byte(the_result) == DRIVER_SENSE)
2231                 sd_print_sense_hdr(sdkp, sshdr);
2232         else
2233                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2234
2235         /*
2236          * Set dirty bit for removable devices if not ready -
2237          * sometimes drives will not report this properly.
2238          */
2239         if (sdp->removable &&
2240             sense_valid && sshdr->sense_key == NOT_READY)
2241                 set_media_not_present(sdkp);
2242
2243         /*
2244          * We used to set media_present to 0 here to indicate no media
2245          * in the drive, but some drives fail read capacity even with
2246          * media present, so we can't do that.
2247          */
2248         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2249 }
2250
2251 #define RC16_LEN 32
2252 #if RC16_LEN > SD_BUF_SIZE
2253 #error RC16_LEN must not be more than SD_BUF_SIZE
2254 #endif
2255
2256 #define READ_CAPACITY_RETRIES_ON_RESET  10
2257
2258 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2259                                                 unsigned char *buffer)
2260 {
2261         unsigned char cmd[16];
2262         struct scsi_sense_hdr sshdr;
2263         int sense_valid = 0;
2264         int the_result;
2265         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2266         unsigned int alignment;
2267         unsigned long long lba;
2268         unsigned sector_size;
2269
2270         if (sdp->no_read_capacity_16)
2271                 return -EINVAL;
2272
2273         do {
2274                 memset(cmd, 0, 16);
2275                 cmd[0] = SERVICE_ACTION_IN_16;
2276                 cmd[1] = SAI_READ_CAPACITY_16;
2277                 cmd[13] = RC16_LEN;
2278                 memset(buffer, 0, RC16_LEN);
2279
2280                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2281                                         buffer, RC16_LEN, &sshdr,
2282                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2283
2284                 if (media_not_present(sdkp, &sshdr))
2285                         return -ENODEV;
2286
2287                 if (the_result) {
2288                         sense_valid = scsi_sense_valid(&sshdr);
2289                         if (sense_valid &&
2290                             sshdr.sense_key == ILLEGAL_REQUEST &&
2291                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2292                             sshdr.ascq == 0x00)
2293                                 /* Invalid Command Operation Code or
2294                                  * Invalid Field in CDB, just retry
2295                                  * silently with RC10 */
2296                                 return -EINVAL;
2297                         if (sense_valid &&
2298                             sshdr.sense_key == UNIT_ATTENTION &&
2299                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2300                                 /* Device reset might occur several times,
2301                                  * give it one more chance */
2302                                 if (--reset_retries > 0)
2303                                         continue;
2304                 }
2305                 retries--;
2306
2307         } while (the_result && retries);
2308
2309         if (the_result) {
2310                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2311                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2312                 return -EINVAL;
2313         }
2314
2315         sector_size = get_unaligned_be32(&buffer[8]);
2316         lba = get_unaligned_be64(&buffer[0]);
2317
2318         if (sd_read_protection_type(sdkp, buffer) < 0) {
2319                 sdkp->capacity = 0;
2320                 return -ENODEV;
2321         }
2322
2323         /* Logical blocks per physical block exponent */
2324         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2325
2326         /* RC basis */
2327         sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2328
2329         /* Lowest aligned logical block */
2330         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2331         blk_queue_alignment_offset(sdp->request_queue, alignment);
2332         if (alignment && sdkp->first_scan)
2333                 sd_printk(KERN_NOTICE, sdkp,
2334                           "physical block alignment offset: %u\n", alignment);
2335
2336         if (buffer[14] & 0x80) { /* LBPME */
2337                 sdkp->lbpme = 1;
2338
2339                 if (buffer[14] & 0x40) /* LBPRZ */
2340                         sdkp->lbprz = 1;
2341
2342                 sd_config_discard(sdkp, SD_LBP_WS16);
2343         }
2344
2345         sdkp->capacity = lba + 1;
2346         return sector_size;
2347 }
2348
2349 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2350                                                 unsigned char *buffer)
2351 {
2352         unsigned char cmd[16];
2353         struct scsi_sense_hdr sshdr;
2354         int sense_valid = 0;
2355         int the_result;
2356         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2357         sector_t lba;
2358         unsigned sector_size;
2359
2360         do {
2361                 cmd[0] = READ_CAPACITY;
2362                 memset(&cmd[1], 0, 9);
2363                 memset(buffer, 0, 8);
2364
2365                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2366                                         buffer, 8, &sshdr,
2367                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2368
2369                 if (media_not_present(sdkp, &sshdr))
2370                         return -ENODEV;
2371
2372                 if (the_result) {
2373                         sense_valid = scsi_sense_valid(&sshdr);
2374                         if (sense_valid &&
2375                             sshdr.sense_key == UNIT_ATTENTION &&
2376                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2377                                 /* Device reset might occur several times,
2378                                  * give it one more chance */
2379                                 if (--reset_retries > 0)
2380                                         continue;
2381                 }
2382                 retries--;
2383
2384         } while (the_result && retries);
2385
2386         if (the_result) {
2387                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2388                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2389                 return -EINVAL;
2390         }
2391
2392         sector_size = get_unaligned_be32(&buffer[4]);
2393         lba = get_unaligned_be32(&buffer[0]);
2394
2395         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2396                 /* Some buggy (usb cardreader) devices return an lba of
2397                    0xffffffff when the want to report a size of 0 (with
2398                    which they really mean no media is present) */
2399                 sdkp->capacity = 0;
2400                 sdkp->physical_block_size = sector_size;
2401                 return sector_size;
2402         }
2403
2404         sdkp->capacity = lba + 1;
2405         sdkp->physical_block_size = sector_size;
2406         return sector_size;
2407 }
2408
2409 static int sd_try_rc16_first(struct scsi_device *sdp)
2410 {
2411         if (sdp->host->max_cmd_len < 16)
2412                 return 0;
2413         if (sdp->try_rc_10_first)
2414                 return 0;
2415         if (sdp->scsi_level > SCSI_SPC_2)
2416                 return 1;
2417         if (scsi_device_protection(sdp))
2418                 return 1;
2419         return 0;
2420 }
2421
2422 /*
2423  * read disk capacity
2424  */
2425 static void
2426 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2427 {
2428         int sector_size;
2429         struct scsi_device *sdp = sdkp->device;
2430
2431         if (sd_try_rc16_first(sdp)) {
2432                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2433                 if (sector_size == -EOVERFLOW)
2434                         goto got_data;
2435                 if (sector_size == -ENODEV)
2436                         return;
2437                 if (sector_size < 0)
2438                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2439                 if (sector_size < 0)
2440                         return;
2441         } else {
2442                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2443                 if (sector_size == -EOVERFLOW)
2444                         goto got_data;
2445                 if (sector_size < 0)
2446                         return;
2447                 if ((sizeof(sdkp->capacity) > 4) &&
2448                     (sdkp->capacity > 0xffffffffULL)) {
2449                         int old_sector_size = sector_size;
2450                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2451                                         "Trying to use READ CAPACITY(16).\n");
2452                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2453                         if (sector_size < 0) {
2454                                 sd_printk(KERN_NOTICE, sdkp,
2455                                         "Using 0xffffffff as device size\n");
2456                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2457                                 sector_size = old_sector_size;
2458                                 goto got_data;
2459                         }
2460                         /* Remember that READ CAPACITY(16) succeeded */
2461                         sdp->try_rc_10_first = 0;
2462                 }
2463         }
2464
2465         /* Some devices are known to return the total number of blocks,
2466          * not the highest block number.  Some devices have versions
2467          * which do this and others which do not.  Some devices we might
2468          * suspect of doing this but we don't know for certain.
2469          *
2470          * If we know the reported capacity is wrong, decrement it.  If
2471          * we can only guess, then assume the number of blocks is even
2472          * (usually true but not always) and err on the side of lowering
2473          * the capacity.
2474          */
2475         if (sdp->fix_capacity ||
2476             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2477                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2478                                 "from its reported value: %llu\n",
2479                                 (unsigned long long) sdkp->capacity);
2480                 --sdkp->capacity;
2481         }
2482
2483 got_data:
2484         if (sector_size == 0) {
2485                 sector_size = 512;
2486                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2487                           "assuming 512.\n");
2488         }
2489
2490         if (sector_size != 512 &&
2491             sector_size != 1024 &&
2492             sector_size != 2048 &&
2493             sector_size != 4096) {
2494                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2495                           sector_size);
2496                 /*
2497                  * The user might want to re-format the drive with
2498                  * a supported sectorsize.  Once this happens, it
2499                  * would be relatively trivial to set the thing up.
2500                  * For this reason, we leave the thing in the table.
2501                  */
2502                 sdkp->capacity = 0;
2503                 /*
2504                  * set a bogus sector size so the normal read/write
2505                  * logic in the block layer will eventually refuse any
2506                  * request on this device without tripping over power
2507                  * of two sector size assumptions
2508                  */
2509                 sector_size = 512;
2510         }
2511         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2512         blk_queue_physical_block_size(sdp->request_queue,
2513                                       sdkp->physical_block_size);
2514         sdkp->device->sector_size = sector_size;
2515
2516         if (sdkp->capacity > 0xffffffff)
2517                 sdp->use_16_for_rw = 1;
2518
2519 }
2520
2521 /*
2522  * Print disk capacity
2523  */
2524 static void
2525 sd_print_capacity(struct scsi_disk *sdkp,
2526                   sector_t old_capacity)
2527 {
2528         int sector_size = sdkp->device->sector_size;
2529         char cap_str_2[10], cap_str_10[10];
2530
2531         if (!sdkp->first_scan && old_capacity == sdkp->capacity)
2532                 return;
2533
2534         string_get_size(sdkp->capacity, sector_size,
2535                         STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2536         string_get_size(sdkp->capacity, sector_size,
2537                         STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
2538
2539         sd_printk(KERN_NOTICE, sdkp,
2540                   "%llu %d-byte logical blocks: (%s/%s)\n",
2541                   (unsigned long long)sdkp->capacity,
2542                   sector_size, cap_str_10, cap_str_2);
2543
2544         if (sdkp->physical_block_size != sector_size)
2545                 sd_printk(KERN_NOTICE, sdkp,
2546                           "%u-byte physical blocks\n",
2547                           sdkp->physical_block_size);
2548
2549         sd_zbc_print_zones(sdkp);
2550 }
2551
2552 /* called with buffer of length 512 */
2553 static inline int
2554 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2555                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2556                  struct scsi_sense_hdr *sshdr)
2557 {
2558         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2559                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2560                                sshdr);
2561 }
2562
2563 /*
2564  * read write protect setting, if possible - called only in sd_revalidate_disk()
2565  * called with buffer of length SD_BUF_SIZE
2566  */
2567 static void
2568 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2569 {
2570         int res;
2571         struct scsi_device *sdp = sdkp->device;
2572         struct scsi_mode_data data;
2573         int old_wp = sdkp->write_prot;
2574
2575         set_disk_ro(sdkp->disk, 0);
2576         if (sdp->skip_ms_page_3f) {
2577                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2578                 return;
2579         }
2580
2581         if (sdp->use_192_bytes_for_3f) {
2582                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2583         } else {
2584                 /*
2585                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2586                  * We have to start carefully: some devices hang if we ask
2587                  * for more than is available.
2588                  */
2589                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2590
2591                 /*
2592                  * Second attempt: ask for page 0 When only page 0 is
2593                  * implemented, a request for page 3F may return Sense Key
2594                  * 5: Illegal Request, Sense Code 24: Invalid field in
2595                  * CDB.
2596                  */
2597                 if (!scsi_status_is_good(res))
2598                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2599
2600                 /*
2601                  * Third attempt: ask 255 bytes, as we did earlier.
2602                  */
2603                 if (!scsi_status_is_good(res))
2604                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2605                                                &data, NULL);
2606         }
2607
2608         if (!scsi_status_is_good(res)) {
2609                 sd_first_printk(KERN_WARNING, sdkp,
2610                           "Test WP failed, assume Write Enabled\n");
2611         } else {
2612                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2613                 set_disk_ro(sdkp->disk, sdkp->write_prot);
2614                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2615                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2616                                   sdkp->write_prot ? "on" : "off");
2617                         sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2618                 }
2619         }
2620 }
2621
2622 /*
2623  * sd_read_cache_type - called only from sd_revalidate_disk()
2624  * called with buffer of length SD_BUF_SIZE
2625  */
2626 static void
2627 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2628 {
2629         int len = 0, res;
2630         struct scsi_device *sdp = sdkp->device;
2631
2632         int dbd;
2633         int modepage;
2634         int first_len;
2635         struct scsi_mode_data data;
2636         struct scsi_sense_hdr sshdr;
2637         int old_wce = sdkp->WCE;
2638         int old_rcd = sdkp->RCD;
2639         int old_dpofua = sdkp->DPOFUA;
2640
2641
2642         if (sdkp->cache_override)
2643                 return;
2644
2645         first_len = 4;
2646         if (sdp->skip_ms_page_8) {
2647                 if (sdp->type == TYPE_RBC)
2648                         goto defaults;
2649                 else {
2650                         if (sdp->skip_ms_page_3f)
2651                                 goto defaults;
2652                         modepage = 0x3F;
2653                         if (sdp->use_192_bytes_for_3f)
2654                                 first_len = 192;
2655                         dbd = 0;
2656                 }
2657         } else if (sdp->type == TYPE_RBC) {
2658                 modepage = 6;
2659                 dbd = 8;
2660         } else {
2661                 modepage = 8;
2662                 dbd = 0;
2663         }
2664
2665         /* cautiously ask */
2666         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2667                         &data, &sshdr);
2668
2669         if (!scsi_status_is_good(res))
2670                 goto bad_sense;
2671
2672         if (!data.header_length) {
2673                 modepage = 6;
2674                 first_len = 0;
2675                 sd_first_printk(KERN_ERR, sdkp,
2676                                 "Missing header in MODE_SENSE response\n");
2677         }
2678
2679         /* that went OK, now ask for the proper length */
2680         len = data.length;
2681
2682         /*
2683          * We're only interested in the first three bytes, actually.
2684          * But the data cache page is defined for the first 20.
2685          */
2686         if (len < 3)
2687                 goto bad_sense;
2688         else if (len > SD_BUF_SIZE) {
2689                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2690                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2691                 len = SD_BUF_SIZE;
2692         }
2693         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2694                 len = 192;
2695
2696         /* Get the data */
2697         if (len > first_len)
2698                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2699                                 &data, &sshdr);
2700
2701         if (scsi_status_is_good(res)) {
2702                 int offset = data.header_length + data.block_descriptor_length;
2703
2704                 while (offset < len) {
2705                         u8 page_code = buffer[offset] & 0x3F;
2706                         u8 spf       = buffer[offset] & 0x40;
2707
2708                         if (page_code == 8 || page_code == 6) {
2709                                 /* We're interested only in the first 3 bytes.
2710                                  */
2711                                 if (len - offset <= 2) {
2712                                         sd_first_printk(KERN_ERR, sdkp,
2713                                                 "Incomplete mode parameter "
2714                                                         "data\n");
2715                                         goto defaults;
2716                                 } else {
2717                                         modepage = page_code;
2718                                         goto Page_found;
2719                                 }
2720                         } else {
2721                                 /* Go to the next page */
2722                                 if (spf && len - offset > 3)
2723                                         offset += 4 + (buffer[offset+2] << 8) +
2724                                                 buffer[offset+3];
2725                                 else if (!spf && len - offset > 1)
2726                                         offset += 2 + buffer[offset+1];
2727                                 else {
2728                                         sd_first_printk(KERN_ERR, sdkp,
2729                                                         "Incomplete mode "
2730                                                         "parameter data\n");
2731                                         goto defaults;
2732                                 }
2733                         }
2734                 }
2735
2736                 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2737                 goto defaults;
2738
2739         Page_found:
2740                 if (modepage == 8) {
2741                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2742                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2743                 } else {
2744                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2745                         sdkp->RCD = 0;
2746                 }
2747
2748                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2749                 if (sdp->broken_fua) {
2750                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2751                         sdkp->DPOFUA = 0;
2752                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2753                            !sdkp->device->use_16_for_rw) {
2754                         sd_first_printk(KERN_NOTICE, sdkp,
2755                                   "Uses READ/WRITE(6), disabling FUA\n");
2756                         sdkp->DPOFUA = 0;
2757                 }
2758
2759                 /* No cache flush allowed for write protected devices */
2760                 if (sdkp->WCE && sdkp->write_prot)
2761                         sdkp->WCE = 0;
2762
2763                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2764                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2765                         sd_printk(KERN_NOTICE, sdkp,
2766                                   "Write cache: %s, read cache: %s, %s\n",
2767                                   sdkp->WCE ? "enabled" : "disabled",
2768                                   sdkp->RCD ? "disabled" : "enabled",
2769                                   sdkp->DPOFUA ? "supports DPO and FUA"
2770                                   : "doesn't support DPO or FUA");
2771
2772                 return;
2773         }
2774
2775 bad_sense:
2776         if (scsi_sense_valid(&sshdr) &&
2777             sshdr.sense_key == ILLEGAL_REQUEST &&
2778             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2779                 /* Invalid field in CDB */
2780                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2781         else
2782                 sd_first_printk(KERN_ERR, sdkp,
2783                                 "Asking for cache data failed\n");
2784
2785 defaults:
2786         if (sdp->wce_default_on) {
2787                 sd_first_printk(KERN_NOTICE, sdkp,
2788                                 "Assuming drive cache: write back\n");
2789                 sdkp->WCE = 1;
2790         } else {
2791                 sd_first_printk(KERN_ERR, sdkp,
2792                                 "Assuming drive cache: write through\n");
2793                 sdkp->WCE = 0;
2794         }
2795         sdkp->RCD = 0;
2796         sdkp->DPOFUA = 0;
2797 }
2798
2799 /*
2800  * The ATO bit indicates whether the DIF application tag is available
2801  * for use by the operating system.
2802  */
2803 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2804 {
2805         int res, offset;
2806         struct scsi_device *sdp = sdkp->device;
2807         struct scsi_mode_data data;
2808         struct scsi_sense_hdr sshdr;
2809
2810         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2811                 return;
2812
2813         if (sdkp->protection_type == 0)
2814                 return;
2815
2816         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2817                               SD_MAX_RETRIES, &data, &sshdr);
2818
2819         if (!scsi_status_is_good(res) || !data.header_length ||
2820             data.length < 6) {
2821                 sd_first_printk(KERN_WARNING, sdkp,
2822                           "getting Control mode page failed, assume no ATO\n");
2823
2824                 if (scsi_sense_valid(&sshdr))
2825                         sd_print_sense_hdr(sdkp, &sshdr);
2826
2827                 return;
2828         }
2829
2830         offset = data.header_length + data.block_descriptor_length;
2831
2832         if ((buffer[offset] & 0x3f) != 0x0a) {
2833                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2834                 return;
2835         }
2836
2837         if ((buffer[offset + 5] & 0x80) == 0)
2838                 return;
2839
2840         sdkp->ATO = 1;
2841
2842         return;
2843 }
2844
2845 /**
2846  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2847  * @sdkp: disk to query
2848  */
2849 static void sd_read_block_limits(struct scsi_disk *sdkp)
2850 {
2851         unsigned int sector_sz = sdkp->device->sector_size;
2852         const int vpd_len = 64;
2853         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2854
2855         if (!buffer ||
2856             /* Block Limits VPD */
2857             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2858                 goto out;
2859
2860         blk_queue_io_min(sdkp->disk->queue,
2861                          get_unaligned_be16(&buffer[6]) * sector_sz);
2862
2863         sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2864         sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2865
2866         if (buffer[3] == 0x3c) {
2867                 unsigned int lba_count, desc_count;
2868
2869                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2870
2871                 if (!sdkp->lbpme)
2872                         goto out;
2873
2874                 lba_count = get_unaligned_be32(&buffer[20]);
2875                 desc_count = get_unaligned_be32(&buffer[24]);
2876
2877                 if (lba_count && desc_count)
2878                         sdkp->max_unmap_blocks = lba_count;
2879
2880                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2881
2882                 if (buffer[32] & 0x80)
2883                         sdkp->unmap_alignment =
2884                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2885
2886                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2887
2888                         if (sdkp->max_unmap_blocks)
2889                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2890                         else
2891                                 sd_config_discard(sdkp, SD_LBP_WS16);
2892
2893                 } else {        /* LBP VPD page tells us what to use */
2894                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2895                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2896                         else if (sdkp->lbpws)
2897                                 sd_config_discard(sdkp, SD_LBP_WS16);
2898                         else if (sdkp->lbpws10)
2899                                 sd_config_discard(sdkp, SD_LBP_WS10);
2900                         else
2901                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2902                 }
2903         }
2904
2905  out:
2906         kfree(buffer);
2907 }
2908
2909 /**
2910  * sd_read_block_characteristics - Query block dev. characteristics
2911  * @sdkp: disk to query
2912  */
2913 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2914 {
2915         struct request_queue *q = sdkp->disk->queue;
2916         unsigned char *buffer;
2917         u16 rot;
2918         const int vpd_len = 64;
2919
2920         buffer = kmalloc(vpd_len, GFP_KERNEL);
2921
2922         if (!buffer ||
2923             /* Block Device Characteristics VPD */
2924             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2925                 goto out;
2926
2927         rot = get_unaligned_be16(&buffer[4]);
2928
2929         if (rot == 1) {
2930                 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2931                 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2932         }
2933
2934         if (sdkp->device->type == TYPE_ZBC) {
2935                 /* Host-managed */
2936                 q->limits.zoned = BLK_ZONED_HM;
2937         } else {
2938                 sdkp->zoned = (buffer[8] >> 4) & 3;
2939                 if (sdkp->zoned == 1)
2940                         /* Host-aware */
2941                         q->limits.zoned = BLK_ZONED_HA;
2942                 else
2943                         /*
2944                          * Treat drive-managed devices as
2945                          * regular block devices.
2946                          */
2947                         q->limits.zoned = BLK_ZONED_NONE;
2948         }
2949         if (blk_queue_is_zoned(q) && sdkp->first_scan)
2950                 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2951                       q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2952
2953  out:
2954         kfree(buffer);
2955 }
2956
2957 /**
2958  * sd_read_block_provisioning - Query provisioning VPD page
2959  * @sdkp: disk to query
2960  */
2961 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2962 {
2963         unsigned char *buffer;
2964         const int vpd_len = 8;
2965
2966         if (sdkp->lbpme == 0)
2967                 return;
2968
2969         buffer = kmalloc(vpd_len, GFP_KERNEL);
2970
2971         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2972                 goto out;
2973
2974         sdkp->lbpvpd    = 1;
2975         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2976         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2977         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2978
2979  out:
2980         kfree(buffer);
2981 }
2982
2983 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2984 {
2985         struct scsi_device *sdev = sdkp->device;
2986
2987         if (sdev->host->no_write_same) {
2988                 sdev->no_write_same = 1;
2989
2990                 return;
2991         }
2992
2993         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2994                 /* too large values might cause issues with arcmsr */
2995                 int vpd_buf_len = 64;
2996
2997                 sdev->no_report_opcodes = 1;
2998
2999                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3000                  * CODES is unsupported and the device has an ATA
3001                  * Information VPD page (SAT).
3002                  */
3003                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3004                         sdev->no_write_same = 1;
3005         }
3006
3007         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3008                 sdkp->ws16 = 1;
3009
3010         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3011                 sdkp->ws10 = 1;
3012 }
3013
3014 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3015 {
3016         struct scsi_device *sdev = sdkp->device;
3017
3018         if (!sdev->security_supported)
3019                 return;
3020
3021         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3022                         SECURITY_PROTOCOL_IN) == 1 &&
3023             scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3024                         SECURITY_PROTOCOL_OUT) == 1)
3025                 sdkp->security = 1;
3026 }
3027
3028 /*
3029  * Determine the device's preferred I/O size for reads and writes
3030  * unless the reported value is unreasonably small, large, not a
3031  * multiple of the physical block size, or simply garbage.
3032  */
3033 static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
3034                                       unsigned int dev_max)
3035 {
3036         struct scsi_device *sdp = sdkp->device;
3037         unsigned int opt_xfer_bytes =
3038                 logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3039
3040         if (sdkp->opt_xfer_blocks == 0)
3041                 return false;
3042
3043         if (sdkp->opt_xfer_blocks > dev_max) {
3044                 sd_first_printk(KERN_WARNING, sdkp,
3045                                 "Optimal transfer size %u logical blocks " \
3046                                 "> dev_max (%u logical blocks)\n",
3047                                 sdkp->opt_xfer_blocks, dev_max);
3048                 return false;
3049         }
3050
3051         if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
3052                 sd_first_printk(KERN_WARNING, sdkp,
3053                                 "Optimal transfer size %u logical blocks " \
3054                                 "> sd driver limit (%u logical blocks)\n",
3055                                 sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
3056                 return false;
3057         }
3058
3059         if (opt_xfer_bytes < PAGE_SIZE) {
3060                 sd_first_printk(KERN_WARNING, sdkp,
3061                                 "Optimal transfer size %u bytes < " \
3062                                 "PAGE_SIZE (%u bytes)\n",
3063                                 opt_xfer_bytes, (unsigned int)PAGE_SIZE);
3064                 return false;
3065         }
3066
3067         if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
3068                 sd_first_printk(KERN_WARNING, sdkp,
3069                                 "Optimal transfer size %u bytes not a " \
3070                                 "multiple of physical block size (%u bytes)\n",
3071                                 opt_xfer_bytes, sdkp->physical_block_size);
3072                 return false;
3073         }
3074
3075         sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
3076                         opt_xfer_bytes);
3077         return true;
3078 }
3079
3080 /**
3081  *      sd_revalidate_disk - called the first time a new disk is seen,
3082  *      performs disk spin up, read_capacity, etc.
3083  *      @disk: struct gendisk we care about
3084  **/
3085 static int sd_revalidate_disk(struct gendisk *disk)
3086 {
3087         struct scsi_disk *sdkp = scsi_disk(disk);
3088         struct scsi_device *sdp = sdkp->device;
3089         struct request_queue *q = sdkp->disk->queue;
3090         sector_t old_capacity = sdkp->capacity;
3091         unsigned char *buffer;
3092         unsigned int dev_max, rw_max;
3093
3094         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3095                                       "sd_revalidate_disk\n"));
3096
3097         /*
3098          * If the device is offline, don't try and read capacity or any
3099          * of the other niceties.
3100          */
3101         if (!scsi_device_online(sdp))
3102                 goto out;
3103
3104         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3105         if (!buffer) {
3106                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3107                           "allocation failure.\n");
3108                 goto out;
3109         }
3110
3111         sd_spinup_disk(sdkp);
3112
3113         /*
3114          * Without media there is no reason to ask; moreover, some devices
3115          * react badly if we do.
3116          */
3117         if (sdkp->media_present) {
3118                 sd_read_capacity(sdkp, buffer);
3119
3120                 /*
3121                  * set the default to rotational.  All non-rotational devices
3122                  * support the block characteristics VPD page, which will
3123                  * cause this to be updated correctly and any device which
3124                  * doesn't support it should be treated as rotational.
3125                  */
3126                 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
3127                 blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
3128
3129                 if (scsi_device_supports_vpd(sdp)) {
3130                         sd_read_block_provisioning(sdkp);
3131                         sd_read_block_limits(sdkp);
3132                         sd_read_block_characteristics(sdkp);
3133                         sd_zbc_read_zones(sdkp, buffer);
3134                 }
3135
3136                 sd_print_capacity(sdkp, old_capacity);
3137
3138                 sd_read_write_protect_flag(sdkp, buffer);
3139                 sd_read_cache_type(sdkp, buffer);
3140                 sd_read_app_tag_own(sdkp, buffer);
3141                 sd_read_write_same(sdkp, buffer);
3142                 sd_read_security(sdkp, buffer);
3143         }
3144
3145         /*
3146          * We now have all cache related info, determine how we deal
3147          * with flush requests.
3148          */
3149         sd_set_flush_flag(sdkp);
3150
3151         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3152         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3153
3154         /* Some devices report a maximum block count for READ/WRITE requests. */
3155         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3156         q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3157
3158         if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
3159                 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3160                 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3161         } else
3162                 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3163                                       (sector_t)BLK_DEF_MAX_SECTORS);
3164
3165         /* Do not exceed controller limit */
3166         rw_max = min(rw_max, queue_max_hw_sectors(q));
3167
3168         /*
3169          * Only update max_sectors if previously unset or if the current value
3170          * exceeds the capabilities of the hardware.
3171          */
3172         if (sdkp->first_scan ||
3173             q->limits.max_sectors > q->limits.max_dev_sectors ||
3174             q->limits.max_sectors > q->limits.max_hw_sectors)
3175                 q->limits.max_sectors = rw_max;
3176
3177         sdkp->first_scan = 0;
3178
3179         set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3180         sd_config_write_same(sdkp);
3181         kfree(buffer);
3182
3183  out:
3184         return 0;
3185 }
3186
3187 /**
3188  *      sd_unlock_native_capacity - unlock native capacity
3189  *      @disk: struct gendisk to set capacity for
3190  *
3191  *      Block layer calls this function if it detects that partitions
3192  *      on @disk reach beyond the end of the device.  If the SCSI host
3193  *      implements ->unlock_native_capacity() method, it's invoked to
3194  *      give it a chance to adjust the device capacity.
3195  *
3196  *      CONTEXT:
3197  *      Defined by block layer.  Might sleep.
3198  */
3199 static void sd_unlock_native_capacity(struct gendisk *disk)
3200 {
3201         struct scsi_device *sdev = scsi_disk(disk)->device;
3202
3203         if (sdev->host->hostt->unlock_native_capacity)
3204                 sdev->host->hostt->unlock_native_capacity(sdev);
3205 }
3206
3207 /**
3208  *      sd_format_disk_name - format disk name
3209  *      @prefix: name prefix - ie. "sd" for SCSI disks
3210  *      @index: index of the disk to format name for
3211  *      @buf: output buffer
3212  *      @buflen: length of the output buffer
3213  *
3214  *      SCSI disk names starts at sda.  The 26th device is sdz and the
3215  *      27th is sdaa.  The last one for two lettered suffix is sdzz
3216  *      which is followed by sdaaa.
3217  *
3218  *      This is basically 26 base counting with one extra 'nil' entry
3219  *      at the beginning from the second digit on and can be
3220  *      determined using similar method as 26 base conversion with the
3221  *      index shifted -1 after each digit is computed.
3222  *
3223  *      CONTEXT:
3224  *      Don't care.
3225  *
3226  *      RETURNS:
3227  *      0 on success, -errno on failure.
3228  */
3229 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3230 {
3231         const int base = 'z' - 'a' + 1;
3232         char *begin = buf + strlen(prefix);
3233         char *end = buf + buflen;
3234         char *p;
3235         int unit;
3236
3237         p = end - 1;
3238         *p = '\0';
3239         unit = base;
3240         do {
3241                 if (p == begin)
3242                         return -EINVAL;
3243                 *--p = 'a' + (index % unit);
3244                 index = (index / unit) - 1;
3245         } while (index >= 0);
3246
3247         memmove(begin, p, end - p);
3248         memcpy(buf, prefix, strlen(prefix));
3249
3250         return 0;
3251 }
3252
3253 /**
3254  *      sd_probe - called during driver initialization and whenever a
3255  *      new scsi device is attached to the system. It is called once
3256  *      for each scsi device (not just disks) present.
3257  *      @dev: pointer to device object
3258  *
3259  *      Returns 0 if successful (or not interested in this scsi device
3260  *      (e.g. scanner)); 1 when there is an error.
3261  *
3262  *      Note: this function is invoked from the scsi mid-level.
3263  *      This function sets up the mapping between a given
3264  *      <host,channel,id,lun> (found in sdp) and new device name
3265  *      (e.g. /dev/sda). More precisely it is the block device major
3266  *      and minor number that is chosen here.
3267  *
3268  *      Assume sd_probe is not re-entrant (for time being)
3269  *      Also think about sd_probe() and sd_remove() running coincidentally.
3270  **/
3271 static int sd_probe(struct device *dev)
3272 {
3273         struct scsi_device *sdp = to_scsi_device(dev);
3274         struct scsi_disk *sdkp;
3275         struct gendisk *gd;
3276         int index;
3277         int error;
3278
3279         scsi_autopm_get_device(sdp);
3280         error = -ENODEV;
3281         if (sdp->type != TYPE_DISK &&
3282             sdp->type != TYPE_ZBC &&
3283             sdp->type != TYPE_MOD &&
3284             sdp->type != TYPE_RBC)
3285                 goto out;
3286
3287 #ifndef CONFIG_BLK_DEV_ZONED
3288         if (sdp->type == TYPE_ZBC)
3289                 goto out;
3290 #endif
3291         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3292                                         "sd_probe\n"));
3293
3294         error = -ENOMEM;
3295         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3296         if (!sdkp)
3297                 goto out;
3298
3299         gd = alloc_disk(SD_MINORS);
3300         if (!gd)
3301                 goto out_free;
3302
3303         index = ida_alloc(&sd_index_ida, GFP_KERNEL);
3304         if (index < 0) {
3305                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3306                 goto out_put;
3307         }
3308
3309         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3310         if (error) {
3311                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3312                 goto out_free_index;
3313         }
3314
3315         sdkp->device = sdp;
3316         sdkp->driver = &sd_template;
3317         sdkp->disk = gd;
3318         sdkp->index = index;
3319         atomic_set(&sdkp->openers, 0);
3320         atomic_set(&sdkp->device->ioerr_cnt, 0);
3321
3322         if (!sdp->request_queue->rq_timeout) {
3323                 if (sdp->type != TYPE_MOD)
3324                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3325                 else
3326                         blk_queue_rq_timeout(sdp->request_queue,
3327                                              SD_MOD_TIMEOUT);
3328         }
3329
3330         device_initialize(&sdkp->dev);
3331         sdkp->dev.parent = dev;
3332         sdkp->dev.class = &sd_disk_class;
3333         dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3334
3335         error = device_add(&sdkp->dev);
3336         if (error)
3337                 goto out_free_index;
3338
3339         get_device(dev);
3340         dev_set_drvdata(dev, sdkp);
3341
3342         gd->major = sd_major((index & 0xf0) >> 4);
3343         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3344
3345         gd->fops = &sd_fops;
3346         gd->private_data = &sdkp->driver;
3347         gd->queue = sdkp->device->request_queue;
3348
3349         /* defaults, until the device tells us otherwise */
3350         sdp->sector_size = 512;
3351         sdkp->capacity = 0;
3352         sdkp->media_present = 1;
3353         sdkp->write_prot = 0;
3354         sdkp->cache_override = 0;
3355         sdkp->WCE = 0;
3356         sdkp->RCD = 0;
3357         sdkp->ATO = 0;
3358         sdkp->first_scan = 1;
3359         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3360
3361         sd_revalidate_disk(gd);
3362
3363         gd->flags = GENHD_FL_EXT_DEVT;
3364         if (sdp->removable) {
3365                 gd->flags |= GENHD_FL_REMOVABLE;
3366                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3367                 gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
3368         }
3369
3370         blk_pm_runtime_init(sdp->request_queue, dev);
3371         device_add_disk(dev, gd, NULL);
3372         if (sdkp->capacity)
3373                 sd_dif_config_host(sdkp);
3374
3375         sd_revalidate_disk(gd);
3376
3377         if (sdkp->security) {
3378                 sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit);
3379                 if (sdkp->opal_dev)
3380                         sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
3381         }
3382
3383         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3384                   sdp->removable ? "removable " : "");
3385         scsi_autopm_put_device(sdp);
3386
3387         return 0;
3388
3389  out_free_index:
3390         ida_free(&sd_index_ida, index);
3391  out_put:
3392         put_disk(gd);
3393  out_free:
3394         kfree(sdkp);
3395  out:
3396         scsi_autopm_put_device(sdp);
3397         return error;
3398 }
3399
3400 /**
3401  *      sd_remove - called whenever a scsi disk (previously recognized by
3402  *      sd_probe) is detached from the system. It is called (potentially
3403  *      multiple times) during sd module unload.
3404  *      @dev: pointer to device object
3405  *
3406  *      Note: this function is invoked from the scsi mid-level.
3407  *      This function potentially frees up a device name (e.g. /dev/sdc)
3408  *      that could be re-used by a subsequent sd_probe().
3409  *      This function is not called when the built-in sd driver is "exit-ed".
3410  **/
3411 static int sd_remove(struct device *dev)
3412 {
3413         struct scsi_disk *sdkp;
3414         dev_t devt;
3415
3416         sdkp = dev_get_drvdata(dev);
3417         devt = disk_devt(sdkp->disk);
3418         scsi_autopm_get_device(sdkp->device);
3419
3420         async_synchronize_full_domain(&scsi_sd_pm_domain);
3421         device_del(&sdkp->dev);
3422         del_gendisk(sdkp->disk);
3423         sd_shutdown(dev);
3424
3425         free_opal_dev(sdkp->opal_dev);
3426
3427         blk_register_region(devt, SD_MINORS, NULL,
3428                             sd_default_probe, NULL, NULL);
3429
3430         mutex_lock(&sd_ref_mutex);
3431         dev_set_drvdata(dev, NULL);
3432         put_device(&sdkp->dev);
3433         mutex_unlock(&sd_ref_mutex);
3434
3435         return 0;
3436 }
3437
3438 /**
3439  *      scsi_disk_release - Called to free the scsi_disk structure
3440  *      @dev: pointer to embedded class device
3441  *
3442  *      sd_ref_mutex must be held entering this routine.  Because it is
3443  *      called on last put, you should always use the scsi_disk_get()
3444  *      scsi_disk_put() helpers which manipulate the semaphore directly
3445  *      and never do a direct put_device.
3446  **/
3447 static void scsi_disk_release(struct device *dev)
3448 {
3449         struct scsi_disk *sdkp = to_scsi_disk(dev);
3450         struct gendisk *disk = sdkp->disk;
3451         struct request_queue *q = disk->queue;
3452
3453         ida_free(&sd_index_ida, sdkp->index);
3454
3455         /*
3456          * Wait until all requests that are in progress have completed.
3457          * This is necessary to avoid that e.g. scsi_end_request() crashes
3458          * due to clearing the disk->private_data pointer. Wait from inside
3459          * scsi_disk_release() instead of from sd_release() to avoid that
3460          * freezing and unfreezing the request queue affects user space I/O
3461          * in case multiple processes open a /dev/sd... node concurrently.
3462          */
3463         blk_mq_freeze_queue(q);
3464         blk_mq_unfreeze_queue(q);
3465
3466         disk->private_data = NULL;
3467         put_disk(disk);
3468         put_device(&sdkp->device->sdev_gendev);
3469
3470         kfree(sdkp);
3471 }
3472
3473 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3474 {
3475         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3476         struct scsi_sense_hdr sshdr;
3477         struct scsi_device *sdp = sdkp->device;
3478         int res;
3479
3480         if (start)
3481                 cmd[4] |= 1;    /* START */
3482
3483         if (sdp->start_stop_pwr_cond)
3484                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3485
3486         if (!scsi_device_online(sdp))
3487                 return -ENODEV;
3488
3489         res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3490                         SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
3491         if (res) {
3492                 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3493                 if (driver_byte(res) == DRIVER_SENSE)
3494                         sd_print_sense_hdr(sdkp, &sshdr);
3495                 if (scsi_sense_valid(&sshdr) &&
3496                         /* 0x3a is medium not present */
3497                         sshdr.asc == 0x3a)
3498                         res = 0;
3499         }
3500
3501         /* SCSI error codes must not go to the generic layer */
3502         if (res)
3503                 return -EIO;
3504
3505         return 0;
3506 }
3507
3508 /*
3509  * Send a SYNCHRONIZE CACHE instruction down to the device through
3510  * the normal SCSI command structure.  Wait for the command to
3511  * complete.
3512  */
3513 static void sd_shutdown(struct device *dev)
3514 {
3515         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3516
3517         if (!sdkp)
3518                 return;         /* this can happen */
3519
3520         if (pm_runtime_suspended(dev))
3521                 return;
3522
3523         if (sdkp->WCE && sdkp->media_present) {
3524                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3525                 sd_sync_cache(sdkp, NULL);
3526         }
3527
3528         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3529                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3530                 sd_start_stop_device(sdkp, 0);
3531         }
3532 }
3533
3534 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3535 {
3536         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3537         struct scsi_sense_hdr sshdr;
3538         int ret = 0;
3539
3540         if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
3541                 return 0;
3542
3543         if (sdkp->WCE && sdkp->media_present) {
3544                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3545                 ret = sd_sync_cache(sdkp, &sshdr);
3546
3547                 if (ret) {
3548                         /* ignore OFFLINE device */
3549                         if (ret == -ENODEV)
3550                                 return 0;
3551
3552                         if (!scsi_sense_valid(&sshdr) ||
3553                             sshdr.sense_key != ILLEGAL_REQUEST)
3554                                 return ret;
3555
3556                         /*
3557                          * sshdr.sense_key == ILLEGAL_REQUEST means this drive
3558                          * doesn't support sync. There's not much to do and
3559                          * suspend shouldn't fail.
3560                          */
3561                         ret = 0;
3562                 }
3563         }
3564
3565         if (sdkp->device->manage_start_stop) {
3566                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3567                 /* an error is not worth aborting a system sleep */
3568                 ret = sd_start_stop_device(sdkp, 0);
3569                 if (ignore_stop_errors)
3570                         ret = 0;
3571         }
3572
3573         return ret;
3574 }
3575
3576 static int sd_suspend_system(struct device *dev)
3577 {
3578         return sd_suspend_common(dev, true);
3579 }
3580
3581 static int sd_suspend_runtime(struct device *dev)
3582 {
3583         return sd_suspend_common(dev, false);
3584 }
3585
3586 static int sd_resume(struct device *dev)
3587 {
3588         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3589         int ret;
3590
3591         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
3592                 return 0;
3593
3594         if (!sdkp->device->manage_start_stop)
3595                 return 0;
3596
3597         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3598         ret = sd_start_stop_device(sdkp, 1);
3599         if (!ret)
3600                 opal_unlock_from_suspend(sdkp->opal_dev);
3601         return ret;
3602 }
3603
3604 /**
3605  *      init_sd - entry point for this driver (both when built in or when
3606  *      a module).
3607  *
3608  *      Note: this function registers this driver with the scsi mid-level.
3609  **/
3610 static int __init init_sd(void)
3611 {
3612         int majors = 0, i, err;
3613
3614         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3615
3616         for (i = 0; i < SD_MAJORS; i++) {
3617                 if (register_blkdev(sd_major(i), "sd") != 0)
3618                         continue;
3619                 majors++;
3620                 blk_register_region(sd_major(i), SD_MINORS, NULL,
3621                                     sd_default_probe, NULL, NULL);
3622         }
3623
3624         if (!majors)
3625                 return -ENODEV;
3626
3627         err = class_register(&sd_disk_class);
3628         if (err)
3629                 goto err_out;
3630
3631         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3632                                          0, 0, NULL);
3633         if (!sd_cdb_cache) {
3634                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3635                 err = -ENOMEM;
3636                 goto err_out_class;
3637         }
3638
3639         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3640         if (!sd_cdb_pool) {
3641                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3642                 err = -ENOMEM;
3643                 goto err_out_cache;
3644         }
3645
3646         sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
3647         if (!sd_page_pool) {
3648                 printk(KERN_ERR "sd: can't init discard page pool\n");
3649                 err = -ENOMEM;
3650                 goto err_out_ppool;
3651         }
3652
3653         err = scsi_register_driver(&sd_template.gendrv);
3654         if (err)
3655                 goto err_out_driver;
3656
3657         return 0;
3658
3659 err_out_driver:
3660         mempool_destroy(sd_page_pool);
3661
3662 err_out_ppool:
3663         mempool_destroy(sd_cdb_pool);
3664
3665 err_out_cache:
3666         kmem_cache_destroy(sd_cdb_cache);
3667
3668 err_out_class:
3669         class_unregister(&sd_disk_class);
3670 err_out:
3671         for (i = 0; i < SD_MAJORS; i++)
3672                 unregister_blkdev(sd_major(i), "sd");
3673         return err;
3674 }
3675
3676 /**
3677  *      exit_sd - exit point for this driver (when it is a module).
3678  *
3679  *      Note: this function unregisters this driver from the scsi mid-level.
3680  **/
3681 static void __exit exit_sd(void)
3682 {
3683         int i;
3684
3685         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3686
3687         scsi_unregister_driver(&sd_template.gendrv);
3688         mempool_destroy(sd_cdb_pool);
3689         mempool_destroy(sd_page_pool);
3690         kmem_cache_destroy(sd_cdb_cache);
3691
3692         class_unregister(&sd_disk_class);
3693
3694         for (i = 0; i < SD_MAJORS; i++) {
3695                 blk_unregister_region(sd_major(i), SD_MINORS);
3696                 unregister_blkdev(sd_major(i), "sd");
3697         }
3698 }
3699
3700 module_init(init_sd);
3701 module_exit(exit_sd);
3702
3703 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3704                                struct scsi_sense_hdr *sshdr)
3705 {
3706         scsi_print_sense_hdr(sdkp->device,
3707                              sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3708 }
3709
3710 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3711                             int result)
3712 {
3713         const char *hb_string = scsi_hostbyte_string(result);
3714         const char *db_string = scsi_driverbyte_string(result);
3715
3716         if (hb_string || db_string)
3717                 sd_printk(KERN_INFO, sdkp,
3718                           "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3719                           hb_string ? hb_string : "invalid",
3720                           db_string ? db_string : "invalid");
3721         else
3722                 sd_printk(KERN_INFO, sdkp,
3723                           "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3724                           msg, host_byte(result), driver_byte(result));
3725 }
3726