drivers/scsi/sd.c

   1 /*
   2  *      sd.c Copyright (C) 1992 Drew Eckhardt
   3  *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   4  *
   5  *      Linux scsi disk driver
   6  *              Initial versions: Drew Eckhardt
   7  *              Subsequent revisions: Eric Youngdale
   8  *      Modification history:
   9  *       - Drew Eckhardt <drew@colorado.edu> original
  10  *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
  11  *         outstanding request, and other enhancements.
  12  *         Support loadable low-level scsi drivers.
  13  *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
  14  *         eight major numbers.
  15  *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
  16  *       - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
  17  *         sd_init and cleanups.
  18  *       - Alex Davis <letmein@erols.com> Fix problem where partition info
  19  *         not being read in sd_open. Fix problem where removable media
  20  *         could be ejected after sd_open.
  21  *       - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
  22  *       - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
  23  *         <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
  24  *         Support 32k/1M disks.
  25  *
  26  *      Logging policy (needs CONFIG_SCSI_LOGGING defined):
  27  *       - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  28  *       - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  29  *       - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  30  *       - entering other commands: SCSI_LOG_HLQUEUE level 3
  31  *      Note: when the logging level is set by the user, it must be greater
  32  *      than the level indicated above to trigger output.
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/fs.h>
  37 #include <linux/kernel.h>
  38 #include <linux/mm.h>
  39 #include <linux/bio.h>
  40 #include <linux/genhd.h>
  41 #include <linux/hdreg.h>
  42 #include <linux/errno.h>
  43 #include <linux/idr.h>
  44 #include <linux/interrupt.h>
  45 #include <linux/init.h>
  46 #include <linux/blkdev.h>
  47 #include <linux/blkpg.h>
  48 #include <linux/delay.h>
  49 #include <linux/mutex.h>
  50 #include <linux/string_helpers.h>
  51 #include <linux/async.h>
  52 #include <linux/slab.h>
  53 #include <linux/pm_runtime.h>
  54 #include <linux/pr.h>
  55 #include <linux/t10-pi.h>
  56 #include <linux/uaccess.h>
  57 #include <asm/unaligned.h>
  58
  59 #include <scsi/scsi.h>
  60 #include <scsi/scsi_cmnd.h>
  61 #include <scsi/scsi_dbg.h>
  62 #include <scsi/scsi_device.h>
  63 #include <scsi/scsi_driver.h>
  64 #include <scsi/scsi_eh.h>
  65 #include <scsi/scsi_host.h>
  66 #include <scsi/scsi_ioctl.h>
  67 #include <scsi/scsicam.h>
  68
  69 #include "sd.h"
  70 #include "scsi_priv.h"
  71 #include "scsi_logging.h"
  72
  73 MODULE_AUTHOR("Eric Youngdale");
  74 MODULE_DESCRIPTION("SCSI disk (sd) driver");
  75 MODULE_LICENSE("GPL");
  76
  77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  93 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  94 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  95 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  96 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
  97
  98 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
  99 #define SD_MINORS       16
 100 #else
 101 #define SD_MINORS       0
 102 #endif
 103
 104 static void sd_config_discard(struct scsi_disk *, unsigned int);
 105 static void sd_config_write_same(struct scsi_disk *);
 106 static int  sd_revalidate_disk(struct gendisk *);
 107 static void sd_unlock_native_capacity(struct gendisk *disk);
 108 static int  sd_probe(struct device *);
 109 static int  sd_remove(struct device *);
 110 static void sd_shutdown(struct device *);
 111 static int sd_suspend_system(struct device *);
 112 static int sd_suspend_runtime(struct device *);
 113 static int sd_resume(struct device *);
 114 static void sd_rescan(struct device *);
 115 static int sd_init_command(struct scsi_cmnd *SCpnt);
 116 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 117 static int sd_done(struct scsi_cmnd *);
 118 static void sd_eh_reset(struct scsi_cmnd *);
 119 static int sd_eh_action(struct scsi_cmnd *, int);
 120 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 121 static void scsi_disk_release(struct device *cdev);
 122 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 123 static void sd_print_result(const struct scsi_disk *, const char *, int);
 124
 125 static DEFINE_SPINLOCK(sd_index_lock);
 126 static DEFINE_IDA(sd_index_ida);
 127
 128 /* This semaphore is used to mediate the 0->1 reference get in the
 129  * face of object destruction (i.e. we can't allow a get on an
 130  * object after last put) */
 131 static DEFINE_MUTEX(sd_ref_mutex);
 132
 133 static struct kmem_cache *sd_cdb_cache;
 134 static mempool_t *sd_cdb_pool;
 135
 136 static const char *sd_cache_types[] = {
 137         "write through", "none", "write back",
 138         "write back, no read (daft)"
 139 };
 140
 141 static void sd_set_flush_flag(struct scsi_disk *sdkp)
 142 {
 143         bool wc = false, fua = false;
 144
 145         if (sdkp->WCE) {
 146                 wc = true;
 147                 if (sdkp->DPOFUA)
 148                         fua = true;
 149         }
 150
 151         blk_queue_write_cache(sdkp->disk->queue, wc, fua);
 152 }
 153
 154 static ssize_t
 155 cache_type_store(struct device *dev, struct device_attribute *attr,
 156                  const char *buf, size_t count)
 157 {
 158         int i, ct = -1, rcd, wce, sp;
 159         struct scsi_disk *sdkp = to_scsi_disk(dev);
 160         struct scsi_device *sdp = sdkp->device;
 161         char buffer[64];
 162         char *buffer_data;
 163         struct scsi_mode_data data;
 164         struct scsi_sense_hdr sshdr;
 165         static const char temp[] = "temporary ";
 166         int len;
 167
 168         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 169                 /* no cache control on RBC devices; theoretically they
 170                  * can do it, but there's probably so many exceptions
 171                  * it's not worth the risk */
 172                 return -EINVAL;
 173
 174         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 175                 buf += sizeof(temp) - 1;
 176                 sdkp->cache_override = 1;
 177         } else {
 178                 sdkp->cache_override = 0;
 179         }
 180
 181         for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
 182                 len = strlen(sd_cache_types[i]);
 183                 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
 184                     buf[len] == '\n') {
 185                         ct = i;
 186                         break;
 187                 }
 188         }
 189         if (ct < 0)
 190                 return -EINVAL;
 191         rcd = ct & 0x01 ? 1 : 0;
 192         wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 193
 194         if (sdkp->cache_override) {
 195                 sdkp->WCE = wce;
 196                 sdkp->RCD = rcd;
 197                 sd_set_flush_flag(sdkp);
 198                 return count;
 199         }
 200
 201         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 202                             SD_MAX_RETRIES, &data, NULL))
 203                 return -EINVAL;
 204         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 205                   data.block_descriptor_length);
 206         buffer_data = buffer + data.header_length +
 207                 data.block_descriptor_length;
 208         buffer_data[2] &= ~0x05;
 209         buffer_data[2] |= wce << 2 | rcd;
 210         sp = buffer_data[0] & 0x80 ? 1 : 0;
 211         buffer_data[0] &= ~0x80;
 212
 213         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 214                              SD_MAX_RETRIES, &data, &sshdr)) {
 215                 if (scsi_sense_valid(&sshdr))
 216                         sd_print_sense_hdr(sdkp, &sshdr);
 217                 return -EINVAL;
 218         }
 219         revalidate_disk(sdkp->disk);
 220         return count;
 221 }
 222
 223 static ssize_t
 224 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
 225                        char *buf)
 226 {
 227         struct scsi_disk *sdkp = to_scsi_disk(dev);
 228         struct scsi_device *sdp = sdkp->device;
 229
 230         return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
 231 }
 232
 233 static ssize_t
 234 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
 235                         const char *buf, size_t count)
 236 {
 237         struct scsi_disk *sdkp = to_scsi_disk(dev);
 238         struct scsi_device *sdp = sdkp->device;
 239
 240         if (!capable(CAP_SYS_ADMIN))
 241                 return -EACCES;
 242
 243         sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
 244
 245         return count;
 246 }
 247 static DEVICE_ATTR_RW(manage_start_stop);
 248
 249 static ssize_t
 250 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 251 {
 252         struct scsi_disk *sdkp = to_scsi_disk(dev);
 253
 254         return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
 255 }
 256
 257 static ssize_t
 258 allow_restart_store(struct device *dev, struct device_attribute *attr,
 259                     const char *buf, size_t count)
 260 {
 261         struct scsi_disk *sdkp = to_scsi_disk(dev);
 262         struct scsi_device *sdp = sdkp->device;
 263
 264         if (!capable(CAP_SYS_ADMIN))
 265                 return -EACCES;
 266
 267         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 268                 return -EINVAL;
 269
 270         sdp->allow_restart = simple_strtoul(buf, NULL, 10);
 271
 272         return count;
 273 }
 274 static DEVICE_ATTR_RW(allow_restart);
 275
 276 static ssize_t
 277 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 278 {
 279         struct scsi_disk *sdkp = to_scsi_disk(dev);
 280         int ct = sdkp->RCD + 2*sdkp->WCE;
 281
 282         return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
 283 }
 284 static DEVICE_ATTR_RW(cache_type);
 285
 286 static ssize_t
 287 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 288 {
 289         struct scsi_disk *sdkp = to_scsi_disk(dev);
 290
 291         return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
 292 }
 293 static DEVICE_ATTR_RO(FUA);
 294
 295 static ssize_t
 296 protection_type_show(struct device *dev, struct device_attribute *attr,
 297                      char *buf)
 298 {
 299         struct scsi_disk *sdkp = to_scsi_disk(dev);
 300
 301         return snprintf(buf, 20, "%u\n", sdkp->protection_type);
 302 }
 303
 304 static ssize_t
 305 protection_type_store(struct device *dev, struct device_attribute *attr,
 306                       const char *buf, size_t count)
 307 {
 308         struct scsi_disk *sdkp = to_scsi_disk(dev);
 309         unsigned int val;
 310         int err;
 311
 312         if (!capable(CAP_SYS_ADMIN))
 313                 return -EACCES;
 314
 315         err = kstrtouint(buf, 10, &val);
 316
 317         if (err)
 318                 return err;
 319
 320         if (val >= 0 && val <= T10_PI_TYPE3_PROTECTION)
 321                 sdkp->protection_type = val;
 322
 323         return count;
 324 }
 325 static DEVICE_ATTR_RW(protection_type);
 326
 327 static ssize_t
 328 protection_mode_show(struct device *dev, struct device_attribute *attr,
 329                      char *buf)
 330 {
 331         struct scsi_disk *sdkp = to_scsi_disk(dev);
 332         struct scsi_device *sdp = sdkp->device;
 333         unsigned int dif, dix;
 334
 335         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 336         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 337
 338         if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
 339                 dif = 0;
 340                 dix = 1;
 341         }
 342
 343         if (!dif && !dix)
 344                 return snprintf(buf, 20, "none\n");
 345
 346         return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
 347 }
 348 static DEVICE_ATTR_RO(protection_mode);
 349
 350 static ssize_t
 351 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 352 {
 353         struct scsi_disk *sdkp = to_scsi_disk(dev);
 354
 355         return snprintf(buf, 20, "%u\n", sdkp->ATO);
 356 }
 357 static DEVICE_ATTR_RO(app_tag_own);
 358
 359 static ssize_t
 360 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
 361                        char *buf)
 362 {
 363         struct scsi_disk *sdkp = to_scsi_disk(dev);
 364
 365         return snprintf(buf, 20, "%u\n", sdkp->lbpme);
 366 }
 367 static DEVICE_ATTR_RO(thin_provisioning);
 368
 369 static const char *lbp_mode[] = {
 370         [SD_LBP_FULL]           = "full",
 371         [SD_LBP_UNMAP]          = "unmap",
 372         [SD_LBP_WS16]           = "writesame_16",
 373         [SD_LBP_WS10]           = "writesame_10",
 374         [SD_LBP_ZERO]           = "writesame_zero",
 375         [SD_LBP_DISABLE]        = "disabled",
 376 };
 377
 378 static ssize_t
 379 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
 380                        char *buf)
 381 {
 382         struct scsi_disk *sdkp = to_scsi_disk(dev);
 383
 384         return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 385 }
 386
 387 static ssize_t
 388 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
 389                         const char *buf, size_t count)
 390 {
 391         struct scsi_disk *sdkp = to_scsi_disk(dev);
 392         struct scsi_device *sdp = sdkp->device;
 393
 394         if (!capable(CAP_SYS_ADMIN))
 395                 return -EACCES;
 396
 397         if (sd_is_zoned(sdkp)) {
 398                 sd_config_discard(sdkp, SD_LBP_DISABLE);
 399                 return count;
 400         }
 401
 402         if (sdp->type != TYPE_DISK)
 403                 return -EINVAL;
 404
 405         if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
 406                 sd_config_discard(sdkp, SD_LBP_UNMAP);
 407         else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
 408                 sd_config_discard(sdkp, SD_LBP_WS16);
 409         else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
 410                 sd_config_discard(sdkp, SD_LBP_WS10);
 411         else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
 412                 sd_config_discard(sdkp, SD_LBP_ZERO);
 413         else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
 414                 sd_config_discard(sdkp, SD_LBP_DISABLE);
 415         else
 416                 return -EINVAL;
 417
 418         return count;
 419 }
 420 static DEVICE_ATTR_RW(provisioning_mode);
 421
 422 static const char *zeroing_mode[] = {
 423         [SD_ZERO_WRITE]         = "write",
 424         [SD_ZERO_WS]            = "writesame",
 425         [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
 426         [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
 427 };
 428
 429 static ssize_t
 430 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
 431                   char *buf)
 432 {
 433         struct scsi_disk *sdkp = to_scsi_disk(dev);
 434
 435         return snprintf(buf, 20, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
 436 }
 437
 438 static ssize_t
 439 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
 440                    const char *buf, size_t count)
 441 {
 442         struct scsi_disk *sdkp = to_scsi_disk(dev);
 443
 444         if (!capable(CAP_SYS_ADMIN))
 445                 return -EACCES;
 446
 447         if (!strncmp(buf, zeroing_mode[SD_ZERO_WRITE], 20))
 448                 sdkp->zeroing_mode = SD_ZERO_WRITE;
 449         else if (!strncmp(buf, zeroing_mode[SD_ZERO_WS], 20))
 450                 sdkp->zeroing_mode = SD_ZERO_WS;
 451         else if (!strncmp(buf, zeroing_mode[SD_ZERO_WS16_UNMAP], 20))
 452                 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
 453         else if (!strncmp(buf, zeroing_mode[SD_ZERO_WS10_UNMAP], 20))
 454                 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
 455         else
 456                 return -EINVAL;
 457
 458         return count;
 459 }
 460 static DEVICE_ATTR_RW(zeroing_mode);
 461
 462 static ssize_t
 463 max_medium_access_timeouts_show(struct device *dev,
 464                                 struct device_attribute *attr, char *buf)
 465 {
 466         struct scsi_disk *sdkp = to_scsi_disk(dev);
 467
 468         return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
 469 }
 470
 471 static ssize_t
 472 max_medium_access_timeouts_store(struct device *dev,
 473                                  struct device_attribute *attr, const char *buf,
 474                                  size_t count)
 475 {
 476         struct scsi_disk *sdkp = to_scsi_disk(dev);
 477         int err;
 478
 479         if (!capable(CAP_SYS_ADMIN))
 480                 return -EACCES;
 481
 482         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 483
 484         return err ? err : count;
 485 }
 486 static DEVICE_ATTR_RW(max_medium_access_timeouts);
 487
 488 static ssize_t
 489 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
 490                            char *buf)
 491 {
 492         struct scsi_disk *sdkp = to_scsi_disk(dev);
 493
 494         return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
 495 }
 496
 497 static ssize_t
 498 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
 499                             const char *buf, size_t count)
 500 {
 501         struct scsi_disk *sdkp = to_scsi_disk(dev);
 502         struct scsi_device *sdp = sdkp->device;
 503         unsigned long max;
 504         int err;
 505
 506         if (!capable(CAP_SYS_ADMIN))
 507                 return -EACCES;
 508
 509         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 510                 return -EINVAL;
 511
 512         err = kstrtoul(buf, 10, &max);
 513
 514         if (err)
 515                 return err;
 516
 517         if (max == 0)
 518                 sdp->no_write_same = 1;
 519         else if (max <= SD_MAX_WS16_BLOCKS) {
 520                 sdp->no_write_same = 0;
 521                 sdkp->max_ws_blocks = max;
 522         }
 523
 524         sd_config_write_same(sdkp);
 525
 526         return count;
 527 }
 528 static DEVICE_ATTR_RW(max_write_same_blocks);
 529
 530 static struct attribute *sd_disk_attrs[] = {
 531         &dev_attr_cache_type.attr,
 532         &dev_attr_FUA.attr,
 533         &dev_attr_allow_restart.attr,
 534         &dev_attr_manage_start_stop.attr,
 535         &dev_attr_protection_type.attr,
 536         &dev_attr_protection_mode.attr,
 537         &dev_attr_app_tag_own.attr,
 538         &dev_attr_thin_provisioning.attr,
 539         &dev_attr_provisioning_mode.attr,
 540         &dev_attr_zeroing_mode.attr,
 541         &dev_attr_max_write_same_blocks.attr,
 542         &dev_attr_max_medium_access_timeouts.attr,
 543         NULL,
 544 };
 545 ATTRIBUTE_GROUPS(sd_disk);
 546
 547 static struct class sd_disk_class = {
 548         .name           = "scsi_disk",
 549         .owner          = THIS_MODULE,
 550         .dev_release    = scsi_disk_release,
 551         .dev_groups     = sd_disk_groups,
 552 };
 553
 554 static const struct dev_pm_ops sd_pm_ops = {
 555         .suspend                = sd_suspend_system,
 556         .resume                 = sd_resume,
 557         .poweroff               = sd_suspend_system,
 558         .restore                = sd_resume,
 559         .runtime_suspend        = sd_suspend_runtime,
 560         .runtime_resume         = sd_resume,
 561 };
 562
 563 static struct scsi_driver sd_template = {
 564         .gendrv = {
 565                 .name           = "sd",
 566                 .owner          = THIS_MODULE,
 567                 .probe          = sd_probe,
 568                 .remove         = sd_remove,
 569                 .shutdown       = sd_shutdown,
 570                 .pm             = &sd_pm_ops,
 571         },
 572         .rescan                 = sd_rescan,
 573         .init_command           = sd_init_command,
 574         .uninit_command         = sd_uninit_command,
 575         .done                   = sd_done,
 576         .eh_action              = sd_eh_action,
 577         .eh_reset               = sd_eh_reset,
 578 };
 579
 580 /*
 581  * Dummy kobj_map->probe function.
 582  * The default ->probe function will call modprobe, which is
 583  * pointless as this module is already loaded.
 584  */
 585 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
 586 {
 587         return NULL;
 588 }
 589
 590 /*
 591  * Device no to disk mapping:
 592  *
 593  *       major         disc2     disc  p1
 594  *   |............|.............|....|....| <- dev_t
 595  *    31        20 19          8 7  4 3  0
 596  *
 597  * Inside a major, we have 16k disks, however mapped non-
 598  * contiguously. The first 16 disks are for major0, the next
 599  * ones with major1, ... Disk 256 is for major0 again, disk 272
 600  * for major1, ...
 601  * As we stay compatible with our numbering scheme, we can reuse
 602  * the well-know SCSI majors 8, 65--71, 136--143.
 603  */
 604 static int sd_major(int major_idx)
 605 {
 606         switch (major_idx) {
 607         case 0:
 608                 return SCSI_DISK0_MAJOR;
 609         case 1 ... 7:
 610                 return SCSI_DISK1_MAJOR + major_idx - 1;
 611         case 8 ... 15:
 612                 return SCSI_DISK8_MAJOR + major_idx - 8;
 613         default:
 614                 BUG();
 615                 return 0;       /* shut up gcc */
 616         }
 617 }
 618
 619 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 620 {
 621         struct scsi_disk *sdkp = NULL;
 622
 623         mutex_lock(&sd_ref_mutex);
 624
 625         if (disk->private_data) {
 626                 sdkp = scsi_disk(disk);
 627                 if (scsi_device_get(sdkp->device) == 0)
 628                         get_device(&sdkp->dev);
 629                 else
 630                         sdkp = NULL;
 631         }
 632         mutex_unlock(&sd_ref_mutex);
 633         return sdkp;
 634 }
 635
 636 static void scsi_disk_put(struct scsi_disk *sdkp)
 637 {
 638         struct scsi_device *sdev = sdkp->device;
 639
 640         mutex_lock(&sd_ref_mutex);
 641         put_device(&sdkp->dev);
 642         scsi_device_put(sdev);
 643         mutex_unlock(&sd_ref_mutex);
 644 }
 645
 646 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
 647                                            unsigned int dix, unsigned int dif)
 648 {
 649         struct bio *bio = scmd->request->bio;
 650         unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
 651         unsigned int protect = 0;
 652
 653         if (dix) {                              /* DIX Type 0, 1, 2, 3 */
 654                 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
 655                         scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
 656
 657                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 658                         scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
 659         }
 660
 661         if (dif != T10_PI_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
 662                 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
 663
 664                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 665                         scmd->prot_flags |= SCSI_PROT_REF_CHECK;
 666         }
 667
 668         if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
 669                 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
 670
 671                 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
 672                         protect = 3 << 5;       /* Disable target PI checking */
 673                 else
 674                         protect = 1 << 5;       /* Enable target PI checking */
 675         }
 676
 677         scsi_set_prot_op(scmd, prot_op);
 678         scsi_set_prot_type(scmd, dif);
 679         scmd->prot_flags &= sd_prot_flag_mask(prot_op);
 680
 681         return protect;
 682 }
 683
 684 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 685 {
 686         struct request_queue *q = sdkp->disk->queue;
 687         unsigned int logical_block_size = sdkp->device->sector_size;
 688         unsigned int max_blocks = 0;
 689
 690         q->limits.discard_alignment =
 691                 sdkp->unmap_alignment * logical_block_size;
 692         q->limits.discard_granularity =
 693                 max(sdkp->physical_block_size,
 694                     sdkp->unmap_granularity * logical_block_size);
 695         sdkp->provisioning_mode = mode;
 696
 697         switch (mode) {
 698
 699         case SD_LBP_DISABLE:
 700                 blk_queue_max_discard_sectors(q, 0);
 701                 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
 702                 return;
 703
 704         case SD_LBP_UNMAP:
 705                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 706                                           (u32)SD_MAX_WS16_BLOCKS);
 707                 break;
 708
 709         case SD_LBP_WS16:
 710                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 711                                           (u32)SD_MAX_WS16_BLOCKS);
 712                 break;
 713
 714         case SD_LBP_WS10:
 715                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 716                                           (u32)SD_MAX_WS10_BLOCKS);
 717                 break;
 718
 719         case SD_LBP_ZERO:
 720                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 721                                           (u32)SD_MAX_WS10_BLOCKS);
 722                 break;
 723         }
 724
 725         blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
 726         queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
 727 }
 728
 729 static int sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
 730 {
 731         struct scsi_device *sdp = cmd->device;
 732         struct request *rq = cmd->request;
 733         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 734         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 735         unsigned int data_len = 24;
 736         char *buf;
 737
 738         rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 739         if (!rq->special_vec.bv_page)
 740                 return BLKPREP_DEFER;
 741         rq->special_vec.bv_offset = 0;
 742         rq->special_vec.bv_len = data_len;
 743         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 744
 745         cmd->cmd_len = 10;
 746         cmd->cmnd[0] = UNMAP;
 747         cmd->cmnd[8] = 24;
 748
 749         buf = page_address(rq->special_vec.bv_page);
 750         put_unaligned_be16(6 + 16, &buf[0]);
 751         put_unaligned_be16(16, &buf[2]);
 752         put_unaligned_be64(sector, &buf[8]);
 753         put_unaligned_be32(nr_sectors, &buf[16]);
 754
 755         cmd->allowed = SD_MAX_RETRIES;
 756         cmd->transfersize = data_len;
 757         rq->timeout = SD_TIMEOUT;
 758         scsi_req(rq)->resid_len = data_len;
 759
 760         return scsi_init_io(cmd);
 761 }
 762
 763 static int sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd, bool unmap)
 764 {
 765         struct scsi_device *sdp = cmd->device;
 766         struct request *rq = cmd->request;
 767         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 768         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 769         u32 data_len = sdp->sector_size;
 770
 771         rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 772         if (!rq->special_vec.bv_page)
 773                 return BLKPREP_DEFER;
 774         rq->special_vec.bv_offset = 0;
 775         rq->special_vec.bv_len = data_len;
 776         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 777
 778         cmd->cmd_len = 16;
 779         cmd->cmnd[0] = WRITE_SAME_16;
 780         if (unmap)
 781                 cmd->cmnd[1] = 0x8; /* UNMAP */
 782         put_unaligned_be64(sector, &cmd->cmnd[2]);
 783         put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
 784
 785         cmd->allowed = SD_MAX_RETRIES;
 786         cmd->transfersize = data_len;
 787         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 788         scsi_req(rq)->resid_len = data_len;
 789
 790         return scsi_init_io(cmd);
 791 }
 792
 793 static int sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, bool unmap)
 794 {
 795         struct scsi_device *sdp = cmd->device;
 796         struct request *rq = cmd->request;
 797         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 798         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 799         u32 data_len = sdp->sector_size;
 800
 801         rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 802         if (!rq->special_vec.bv_page)
 803                 return BLKPREP_DEFER;
 804         rq->special_vec.bv_offset = 0;
 805         rq->special_vec.bv_len = data_len;
 806         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 807
 808         cmd->cmd_len = 10;
 809         cmd->cmnd[0] = WRITE_SAME;
 810         if (unmap)
 811                 cmd->cmnd[1] = 0x8; /* UNMAP */
 812         put_unaligned_be32(sector, &cmd->cmnd[2]);
 813         put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
 814
 815         cmd->allowed = SD_MAX_RETRIES;
 816         cmd->transfersize = data_len;
 817         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 818         scsi_req(rq)->resid_len = data_len;
 819
 820         return scsi_init_io(cmd);
 821 }
 822
 823 static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
 824 {
 825         struct request *rq = cmd->request;
 826         struct scsi_device *sdp = cmd->device;
 827         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 828         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 829         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 830         int ret;
 831
 832         if (!(rq->cmd_flags & REQ_NOUNMAP)) {
 833                 switch (sdkp->zeroing_mode) {
 834                 case SD_ZERO_WS16_UNMAP:
 835                         ret = sd_setup_write_same16_cmnd(cmd, true);
 836                         goto out;
 837                 case SD_ZERO_WS10_UNMAP:
 838                         ret = sd_setup_write_same10_cmnd(cmd, true);
 839                         goto out;
 840                 }
 841         }
 842
 843         if (sdp->no_write_same)
 844                 return BLKPREP_INVALID;
 845
 846         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
 847                 ret = sd_setup_write_same16_cmnd(cmd, false);
 848         else
 849                 ret = sd_setup_write_same10_cmnd(cmd, false);
 850
 851 out:
 852         if (sd_is_zoned(sdkp) && ret == BLKPREP_OK)
 853                 return sd_zbc_write_lock_zone(cmd);
 854
 855         return ret;
 856 }
 857
 858 static void sd_config_write_same(struct scsi_disk *sdkp)
 859 {
 860         struct request_queue *q = sdkp->disk->queue;
 861         unsigned int logical_block_size = sdkp->device->sector_size;
 862
 863         if (sdkp->device->no_write_same) {
 864                 sdkp->max_ws_blocks = 0;
 865                 goto out;
 866         }
 867
 868         /* Some devices can not handle block counts above 0xffff despite
 869          * supporting WRITE SAME(16). Consequently we default to 64k
 870          * blocks per I/O unless the device explicitly advertises a
 871          * bigger limit.
 872          */
 873         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 874                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 875                                                    (u32)SD_MAX_WS16_BLOCKS);
 876         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 877                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 878                                                    (u32)SD_MAX_WS10_BLOCKS);
 879         else {
 880                 sdkp->device->no_write_same = 1;
 881                 sdkp->max_ws_blocks = 0;
 882         }
 883
 884         if (sdkp->lbprz && sdkp->lbpws)
 885                 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
 886         else if (sdkp->lbprz && sdkp->lbpws10)
 887                 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
 888         else if (sdkp->max_ws_blocks)
 889                 sdkp->zeroing_mode = SD_ZERO_WS;
 890         else
 891                 sdkp->zeroing_mode = SD_ZERO_WRITE;
 892
 893 out:
 894         blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
 895                                          (logical_block_size >> 9));
 896         blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
 897                                          (logical_block_size >> 9));
 898 }
 899
 900 /**
 901  * sd_setup_write_same_cmnd - write the same data to multiple blocks
 902  * @cmd: command to prepare
 903  *
 904  * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
 905  * the preference indicated by the target device.
 906  **/
 907 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
 908 {
 909         struct request *rq = cmd->request;
 910         struct scsi_device *sdp = cmd->device;
 911         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 912         struct bio *bio = rq->bio;
 913         sector_t sector = blk_rq_pos(rq);
 914         unsigned int nr_sectors = blk_rq_sectors(rq);
 915         unsigned int nr_bytes = blk_rq_bytes(rq);
 916         int ret;
 917
 918         if (sdkp->device->no_write_same)
 919                 return BLKPREP_INVALID;
 920
 921         BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
 922
 923         if (sd_is_zoned(sdkp)) {
 924                 ret = sd_zbc_write_lock_zone(cmd);
 925                 if (ret != BLKPREP_OK)
 926                         return ret;
 927         }
 928
 929         sector >>= ilog2(sdp->sector_size) - 9;
 930         nr_sectors >>= ilog2(sdp->sector_size) - 9;
 931
 932         rq->timeout = SD_WRITE_SAME_TIMEOUT;
 933
 934         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
 935                 cmd->cmd_len = 16;
 936                 cmd->cmnd[0] = WRITE_SAME_16;
 937                 put_unaligned_be64(sector, &cmd->cmnd[2]);
 938                 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
 939         } else {
 940                 cmd->cmd_len = 10;
 941                 cmd->cmnd[0] = WRITE_SAME;
 942                 put_unaligned_be32(sector, &cmd->cmnd[2]);
 943                 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
 944         }
 945
 946         cmd->transfersize = sdp->sector_size;
 947         cmd->allowed = SD_MAX_RETRIES;
 948
 949         /*
 950          * For WRITE SAME the data transferred via the DATA OUT buffer is
 951          * different from the amount of data actually written to the target.
 952          *
 953          * We set up __data_len to the amount of data transferred via the
 954          * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
 955          * to transfer a single sector of data first, but then reset it to
 956          * the amount of data to be written right after so that the I/O path
 957          * knows how much to actually write.
 958          */
 959         rq->__data_len = sdp->sector_size;
 960         ret = scsi_init_io(cmd);
 961         rq->__data_len = nr_bytes;
 962
 963         if (sd_is_zoned(sdkp) && ret != BLKPREP_OK)
 964                 sd_zbc_write_unlock_zone(cmd);
 965
 966         return ret;
 967 }
 968
 969 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
 970 {
 971         struct request *rq = cmd->request;
 972
 973         /* flush requests don't perform I/O, zero the S/G table */
 974         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
 975
 976         cmd->cmnd[0] = SYNCHRONIZE_CACHE;
 977         cmd->cmd_len = 10;
 978         cmd->transfersize = 0;
 979         cmd->allowed = SD_MAX_RETRIES;
 980
 981         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
 982         return BLKPREP_OK;
 983 }
 984
 985 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
 986 {
 987         struct request *rq = SCpnt->request;
 988         struct scsi_device *sdp = SCpnt->device;
 989         struct gendisk *disk = rq->rq_disk;
 990         struct scsi_disk *sdkp = scsi_disk(disk);
 991         sector_t block = blk_rq_pos(rq);
 992         sector_t threshold;
 993         unsigned int this_count = blk_rq_sectors(rq);
 994         unsigned int dif, dix;
 995         bool zoned_write = sd_is_zoned(sdkp) && rq_data_dir(rq) == WRITE;
 996         int ret;
 997         unsigned char protect;
 998
 999         if (zoned_write) {
1000                 ret = sd_zbc_write_lock_zone(SCpnt);
1001                 if (ret != BLKPREP_OK)
1002                         return ret;
1003         }
1004
1005         ret = scsi_init_io(SCpnt);
1006         if (ret != BLKPREP_OK)
1007                 goto out;
1008         SCpnt = rq->special;
1009
1010         /* from here on until we're complete, any goto out
1011          * is used for a killable error condition */
1012         ret = BLKPREP_KILL;
1013
1014         SCSI_LOG_HLQUEUE(1,
1015                 scmd_printk(KERN_INFO, SCpnt,
1016                         "%s: block=%llu, count=%d\n",
1017                         __func__, (unsigned long long)block, this_count));
1018
1019         if (!sdp || !scsi_device_online(sdp) ||
1020             block + blk_rq_sectors(rq) > get_capacity(disk)) {
1021                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1022                                                 "Finishing %u sectors\n",
1023                                                 blk_rq_sectors(rq)));
1024                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1025                                                 "Retry with 0x%p\n", SCpnt));
1026                 goto out;
1027         }
1028
1029         if (sdp->changed) {
1030                 /*
1031                  * quietly refuse to do anything to a changed disc until
1032                  * the changed bit has been reset
1033                  */
1034                 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
1035                 goto out;
1036         }
1037
1038         /*
1039          * Some SD card readers can't handle multi-sector accesses which touch
1040          * the last one or two hardware sectors.  Split accesses as needed.
1041          */
1042         threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
1043                 (sdp->sector_size / 512);
1044
1045         if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
1046                 if (block < threshold) {
1047                         /* Access up to the threshold but not beyond */
1048                         this_count = threshold - block;
1049                 } else {
1050                         /* Access only a single hardware sector */
1051                         this_count = sdp->sector_size / 512;
1052                 }
1053         }
1054
1055         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
1056                                         (unsigned long long)block));
1057
1058         /*
1059          * If we have a 1K hardware sectorsize, prevent access to single
1060          * 512 byte sectors.  In theory we could handle this - in fact
1061          * the scsi cdrom driver must be able to handle this because
1062          * we typically use 1K blocksizes, and cdroms typically have
1063          * 2K hardware sectorsizes.  Of course, things are simpler
1064          * with the cdrom, since it is read-only.  For performance
1065          * reasons, the filesystems should be able to handle this
1066          * and not force the scsi disk driver to use bounce buffers
1067          * for this.
1068          */
1069         if (sdp->sector_size == 1024) {
1070                 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
1071                         scmd_printk(KERN_ERR, SCpnt,
1072                                     "Bad block number requested\n");
1073                         goto out;
1074                 } else {
1075                         block = block >> 1;
1076                         this_count = this_count >> 1;
1077                 }
1078         }
1079         if (sdp->sector_size == 2048) {
1080                 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
1081                         scmd_printk(KERN_ERR, SCpnt,
1082                                     "Bad block number requested\n");
1083                         goto out;
1084                 } else {
1085                         block = block >> 2;
1086                         this_count = this_count >> 2;
1087                 }
1088         }
1089         if (sdp->sector_size == 4096) {
1090                 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
1091                         scmd_printk(KERN_ERR, SCpnt,
1092                                     "Bad block number requested\n");
1093                         goto out;
1094                 } else {
1095                         block = block >> 3;
1096                         this_count = this_count >> 3;
1097                 }
1098         }
1099         if (rq_data_dir(rq) == WRITE) {
1100                 SCpnt->cmnd[0] = WRITE_6;
1101
1102                 if (blk_integrity_rq(rq))
1103                         sd_dif_prepare(SCpnt);
1104
1105         } else if (rq_data_dir(rq) == READ) {
1106                 SCpnt->cmnd[0] = READ_6;
1107         } else {
1108                 scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq));
1109                 goto out;
1110         }
1111
1112         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1113                                         "%s %d/%u 512 byte blocks.\n",
1114                                         (rq_data_dir(rq) == WRITE) ?
1115                                         "writing" : "reading", this_count,
1116                                         blk_rq_sectors(rq)));
1117
1118         dix = scsi_prot_sg_count(SCpnt);
1119         dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1120
1121         if (dif || dix)
1122                 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1123         else
1124                 protect = 0;
1125
1126         if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1127                 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1128
1129                 if (unlikely(SCpnt->cmnd == NULL)) {
1130                         ret = BLKPREP_DEFER;
1131                         goto out;
1132                 }
1133
1134                 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1135                 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1136                 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1137                 SCpnt->cmnd[7] = 0x18;
1138                 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1139                 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1140
1141                 /* LBA */
1142                 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1143                 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1144                 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1145                 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1146                 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1147                 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1148                 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1149                 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1150
1151                 /* Expected Indirect LBA */
1152                 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1153                 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1154                 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1155                 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1156
1157                 /* Transfer length */
1158                 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1159                 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1160                 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1161                 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1162         } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1163                 SCpnt->cmnd[0] += READ_16 - READ_6;
1164                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1165                 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1166                 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1167                 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1168                 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1169                 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1170                 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1171                 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1172                 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1173                 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1174                 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1175                 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1176                 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1177                 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1178         } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1179                    scsi_device_protection(SCpnt->device) ||
1180                    SCpnt->device->use_10_for_rw) {
1181                 SCpnt->cmnd[0] += READ_10 - READ_6;
1182                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1183                 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1184                 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1185                 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1186                 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1187                 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1188                 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1189                 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1190         } else {
1191                 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1192                         /*
1193                          * This happens only if this drive failed
1194                          * 10byte rw command with ILLEGAL_REQUEST
1195                          * during operation and thus turned off
1196                          * use_10_for_rw.
1197                          */
1198                         scmd_printk(KERN_ERR, SCpnt,
1199                                     "FUA write on READ/WRITE(6) drive\n");
1200                         goto out;
1201                 }
1202
1203                 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1204                 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1205                 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1206                 SCpnt->cmnd[4] = (unsigned char) this_count;
1207                 SCpnt->cmnd[5] = 0;
1208         }
1209         SCpnt->sdb.length = this_count * sdp->sector_size;
1210
1211         /*
1212          * We shouldn't disconnect in the middle of a sector, so with a dumb
1213          * host adapter, it's safe to assume that we can at least transfer
1214          * this many bytes between each connect / disconnect.
1215          */
1216         SCpnt->transfersize = sdp->sector_size;
1217         SCpnt->underflow = this_count << 9;
1218         SCpnt->allowed = SD_MAX_RETRIES;
1219
1220         /*
1221          * This indicates that the command is ready from our end to be
1222          * queued.
1223          */
1224         ret = BLKPREP_OK;
1225  out:
1226         if (zoned_write && ret != BLKPREP_OK)
1227                 sd_zbc_write_unlock_zone(SCpnt);
1228
1229         return ret;
1230 }
1231
1232 static int sd_init_command(struct scsi_cmnd *cmd)
1233 {
1234         struct request *rq = cmd->request;
1235
1236         switch (req_op(rq)) {
1237         case REQ_OP_DISCARD:
1238                 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1239                 case SD_LBP_UNMAP:
1240                         return sd_setup_unmap_cmnd(cmd);
1241                 case SD_LBP_WS16:
1242                         return sd_setup_write_same16_cmnd(cmd, true);
1243                 case SD_LBP_WS10:
1244                         return sd_setup_write_same10_cmnd(cmd, true);
1245                 case SD_LBP_ZERO:
1246                         return sd_setup_write_same10_cmnd(cmd, false);
1247                 default:
1248                         return BLKPREP_INVALID;
1249                 }
1250         case REQ_OP_WRITE_ZEROES:
1251                 return sd_setup_write_zeroes_cmnd(cmd);
1252         case REQ_OP_WRITE_SAME:
1253                 return sd_setup_write_same_cmnd(cmd);
1254         case REQ_OP_FLUSH:
1255                 return sd_setup_flush_cmnd(cmd);
1256         case REQ_OP_READ:
1257         case REQ_OP_WRITE:
1258                 return sd_setup_read_write_cmnd(cmd);
1259         case REQ_OP_ZONE_REPORT:
1260                 return sd_zbc_setup_report_cmnd(cmd);
1261         case REQ_OP_ZONE_RESET:
1262                 return sd_zbc_setup_reset_cmnd(cmd);
1263         default:
1264                 BUG();
1265         }
1266 }
1267
1268 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1269 {
1270         struct request *rq = SCpnt->request;
1271
1272         if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1273                 __free_page(rq->special_vec.bv_page);
1274
1275         if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1276                 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1277                 SCpnt->cmnd = NULL;
1278                 SCpnt->cmd_len = 0;
1279         }
1280 }
1281
1282 /**
1283  *      sd_open - open a scsi disk device
1284  *      @bdev: Block device of the scsi disk to open
1285  *      @mode: FMODE_* mask
1286  *
1287  *      Returns 0 if successful. Returns a negated errno value in case
1288  *      of error.
1289  *
1290  *      Note: This can be called from a user context (e.g. fsck(1) )
1291  *      or from within the kernel (e.g. as a result of a mount(1) ).
1292  *      In the latter case @inode and @filp carry an abridged amount
1293  *      of information as noted above.
1294  *
1295  *      Locking: called with bdev->bd_mutex held.
1296  **/
1297 static int sd_open(struct block_device *bdev, fmode_t mode)
1298 {
1299         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1300         struct scsi_device *sdev;
1301         int retval;
1302
1303         if (!sdkp)
1304                 return -ENXIO;
1305
1306         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1307
1308         sdev = sdkp->device;
1309
1310         /*
1311          * If the device is in error recovery, wait until it is done.
1312          * If the device is offline, then disallow any access to it.
1313          */
1314         retval = -ENXIO;
1315         if (!scsi_block_when_processing_errors(sdev))
1316                 goto error_out;
1317
1318         if (sdev->removable || sdkp->write_prot)
1319                 check_disk_change(bdev);
1320
1321         /*
1322          * If the drive is empty, just let the open fail.
1323          */
1324         retval = -ENOMEDIUM;
1325         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1326                 goto error_out;
1327
1328         /*
1329          * If the device has the write protect tab set, have the open fail
1330          * if the user expects to be able to write to the thing.
1331          */
1332         retval = -EROFS;
1333         if (sdkp->write_prot && (mode & FMODE_WRITE))
1334                 goto error_out;
1335
1336         /*
1337          * It is possible that the disk changing stuff resulted in
1338          * the device being taken offline.  If this is the case,
1339          * report this to the user, and don't pretend that the
1340          * open actually succeeded.
1341          */
1342         retval = -ENXIO;
1343         if (!scsi_device_online(sdev))
1344                 goto error_out;
1345
1346         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1347                 if (scsi_block_when_processing_errors(sdev))
1348                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1349         }
1350
1351         return 0;
1352
1353 error_out:
1354         scsi_disk_put(sdkp);
1355         return retval;
1356 }
1357
1358 /**
1359  *      sd_release - invoked when the (last) close(2) is called on this
1360  *      scsi disk.
1361  *      @disk: disk to release
1362  *      @mode: FMODE_* mask
1363  *
1364  *      Returns 0.
1365  *
1366  *      Note: may block (uninterruptible) if error recovery is underway
1367  *      on this disk.
1368  *
1369  *      Locking: called with bdev->bd_mutex held.
1370  **/
1371 static void sd_release(struct gendisk *disk, fmode_t mode)
1372 {
1373         struct scsi_disk *sdkp = scsi_disk(disk);
1374         struct scsi_device *sdev = sdkp->device;
1375
1376         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1377
1378         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1379                 if (scsi_block_when_processing_errors(sdev))
1380                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1381         }
1382
1383         /*
1384          * XXX and what if there are packets in flight and this close()
1385          * XXX is followed by a "rmmod sd_mod"?
1386          */
1387
1388         scsi_disk_put(sdkp);
1389 }
1390
1391 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1392 {
1393         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1394         struct scsi_device *sdp = sdkp->device;
1395         struct Scsi_Host *host = sdp->host;
1396         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1397         int diskinfo[4];
1398
1399         /* default to most commonly used values */
1400         diskinfo[0] = 0x40;     /* 1 << 6 */
1401         diskinfo[1] = 0x20;     /* 1 << 5 */
1402         diskinfo[2] = capacity >> 11;
1403
1404         /* override with calculated, extended default, or driver values */
1405         if (host->hostt->bios_param)
1406                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1407         else
1408                 scsicam_bios_param(bdev, capacity, diskinfo);
1409
1410         geo->heads = diskinfo[0];
1411         geo->sectors = diskinfo[1];
1412         geo->cylinders = diskinfo[2];
1413         return 0;
1414 }
1415
1416 /**
1417  *      sd_ioctl - process an ioctl
1418  *      @bdev: target block device
1419  *      @mode: FMODE_* mask
1420  *      @cmd: ioctl command number
1421  *      @arg: this is third argument given to ioctl(2) system call.
1422  *      Often contains a pointer.
1423  *
1424  *      Returns 0 if successful (some ioctls return positive numbers on
1425  *      success as well). Returns a negated errno value in case of error.
1426  *
1427  *      Note: most ioctls are forward onto the block subsystem or further
1428  *      down in the scsi subsystem.
1429  **/
1430 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1431                     unsigned int cmd, unsigned long arg)
1432 {
1433         struct gendisk *disk = bdev->bd_disk;
1434         struct scsi_disk *sdkp = scsi_disk(disk);
1435         struct scsi_device *sdp = sdkp->device;
1436         void __user *p = (void __user *)arg;
1437         int error;
1438
1439         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1440                                     "cmd=0x%x\n", disk->disk_name, cmd));
1441
1442         error = scsi_verify_blk_ioctl(bdev, cmd);
1443         if (error < 0)
1444                 return error;
1445
1446         /*
1447          * If we are in the middle of error recovery, don't let anyone
1448          * else try and use this device.  Also, if error recovery fails, it
1449          * may try and take the device offline, in which case all further
1450          * access to the device is prohibited.
1451          */
1452         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1453                         (mode & FMODE_NDELAY) != 0);
1454         if (error)
1455                 goto out;
1456
1457         /*
1458          * Send SCSI addressing ioctls directly to mid level, send other
1459          * ioctls to block level and then onto mid level if they can't be
1460          * resolved.
1461          */
1462         switch (cmd) {
1463                 case SCSI_IOCTL_GET_IDLUN:
1464                 case SCSI_IOCTL_GET_BUS_NUMBER:
1465                         error = scsi_ioctl(sdp, cmd, p);
1466                         break;
1467                 default:
1468                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1469                         if (error != -ENOTTY)
1470                                 break;
1471                         error = scsi_ioctl(sdp, cmd, p);
1472                         break;
1473         }
1474 out:
1475         return error;
1476 }
1477
1478 static void set_media_not_present(struct scsi_disk *sdkp)
1479 {
1480         if (sdkp->media_present)
1481                 sdkp->device->changed = 1;
1482
1483         if (sdkp->device->removable) {
1484                 sdkp->media_present = 0;
1485                 sdkp->capacity = 0;
1486         }
1487 }
1488
1489 static int media_not_present(struct scsi_disk *sdkp,
1490                              struct scsi_sense_hdr *sshdr)
1491 {
1492         if (!scsi_sense_valid(sshdr))
1493                 return 0;
1494
1495         /* not invoked for commands that could return deferred errors */
1496         switch (sshdr->sense_key) {
1497         case UNIT_ATTENTION:
1498         case NOT_READY:
1499                 /* medium not present */
1500                 if (sshdr->asc == 0x3A) {
1501                         set_media_not_present(sdkp);
1502                         return 1;
1503                 }
1504         }
1505         return 0;
1506 }
1507
1508 /**
1509  *      sd_check_events - check media events
1510  *      @disk: kernel device descriptor
1511  *      @clearing: disk events currently being cleared
1512  *
1513  *      Returns mask of DISK_EVENT_*.
1514  *
1515  *      Note: this function is invoked from the block subsystem.
1516  **/
1517 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1518 {
1519         struct scsi_disk *sdkp = scsi_disk_get(disk);
1520         struct scsi_device *sdp;
1521         int retval;
1522
1523         if (!sdkp)
1524                 return 0;
1525
1526         sdp = sdkp->device;
1527         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1528
1529         /*
1530          * If the device is offline, don't send any commands - just pretend as
1531          * if the command failed.  If the device ever comes back online, we
1532          * can deal with it then.  It is only because of unrecoverable errors
1533          * that we would ever take a device offline in the first place.
1534          */
1535         if (!scsi_device_online(sdp)) {
1536                 set_media_not_present(sdkp);
1537                 goto out;
1538         }
1539
1540         /*
1541          * Using TEST_UNIT_READY enables differentiation between drive with
1542          * no cartridge loaded - NOT READY, drive with changed cartridge -
1543          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1544          *
1545          * Drives that auto spin down. eg iomega jaz 1G, will be started
1546          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1547          * sd_revalidate() is called.
1548          */
1549         if (scsi_block_when_processing_errors(sdp)) {
1550                 struct scsi_sense_hdr sshdr = { 0, };
1551
1552                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1553                                               &sshdr);
1554
1555                 /* failed to execute TUR, assume media not present */
1556                 if (host_byte(retval)) {
1557                         set_media_not_present(sdkp);
1558                         goto out;
1559                 }
1560
1561                 if (media_not_present(sdkp, &sshdr))
1562                         goto out;
1563         }
1564
1565         /*
1566          * For removable scsi disk we have to recognise the presence
1567          * of a disk in the drive.
1568          */
1569         if (!sdkp->media_present)
1570                 sdp->changed = 1;
1571         sdkp->media_present = 1;
1572 out:
1573         /*
1574          * sdp->changed is set under the following conditions:
1575          *
1576          *      Medium present state has changed in either direction.
1577          *      Device has indicated UNIT_ATTENTION.
1578          */
1579         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1580         sdp->changed = 0;
1581         scsi_disk_put(sdkp);
1582         return retval;
1583 }
1584
1585 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1586 {
1587         int retries, res;
1588         struct scsi_device *sdp = sdkp->device;
1589         const int timeout = sdp->request_queue->rq_timeout
1590                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1591         struct scsi_sense_hdr my_sshdr;
1592
1593         if (!scsi_device_online(sdp))
1594                 return -ENODEV;
1595
1596         /* caller might not be interested in sense, but we need it */
1597         if (!sshdr)
1598                 sshdr = &my_sshdr;
1599
1600         for (retries = 3; retries > 0; --retries) {
1601                 unsigned char cmd[10] = { 0 };
1602
1603                 cmd[0] = SYNCHRONIZE_CACHE;
1604                 /*
1605                  * Leave the rest of the command zero to indicate
1606                  * flush everything.
1607                  */
1608                 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1609                                 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1610                 if (res == 0)
1611                         break;
1612         }
1613
1614         if (res) {
1615                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1616
1617                 if (driver_byte(res) & DRIVER_SENSE)
1618                         sd_print_sense_hdr(sdkp, sshdr);
1619
1620                 /* we need to evaluate the error return  */
1621                 if (scsi_sense_valid(sshdr) &&
1622                         (sshdr->asc == 0x3a ||  /* medium not present */
1623                          sshdr->asc == 0x20))   /* invalid command */
1624                                 /* this is no error here */
1625                                 return 0;
1626
1627                 switch (host_byte(res)) {
1628                 /* ignore errors due to racing a disconnection */
1629                 case DID_BAD_TARGET:
1630                 case DID_NO_CONNECT:
1631                         return 0;
1632                 /* signal the upper layer it might try again */
1633                 case DID_BUS_BUSY:
1634                 case DID_IMM_RETRY:
1635                 case DID_REQUEUE:
1636                 case DID_SOFT_ERROR:
1637                         return -EBUSY;
1638                 default:
1639                         return -EIO;
1640                 }
1641         }
1642         return 0;
1643 }
1644
1645 static void sd_rescan(struct device *dev)
1646 {
1647         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1648
1649         revalidate_disk(sdkp->disk);
1650 }
1651
1652
1653 #ifdef CONFIG_COMPAT
1654 /*
1655  * This gets directly called from VFS. When the ioctl
1656  * is not recognized we go back to the other translation paths.
1657  */
1658 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1659                            unsigned int cmd, unsigned long arg)
1660 {
1661         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1662         int error;
1663
1664         error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1665                         (mode & FMODE_NDELAY) != 0);
1666         if (error)
1667                 return error;
1668
1669         /*
1670          * Let the static ioctl translation table take care of it.
1671          */
1672         if (!sdev->host->hostt->compat_ioctl)
1673                 return -ENOIOCTLCMD;
1674         return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1675 }
1676 #endif
1677
1678 static char sd_pr_type(enum pr_type type)
1679 {
1680         switch (type) {
1681         case PR_WRITE_EXCLUSIVE:
1682                 return 0x01;
1683         case PR_EXCLUSIVE_ACCESS:
1684                 return 0x03;
1685         case PR_WRITE_EXCLUSIVE_REG_ONLY:
1686                 return 0x05;
1687         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1688                 return 0x06;
1689         case PR_WRITE_EXCLUSIVE_ALL_REGS:
1690                 return 0x07;
1691         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1692                 return 0x08;
1693         default:
1694                 return 0;
1695         }
1696 };
1697
1698 static int sd_pr_command(struct block_device *bdev, u8 sa,
1699                 u64 key, u64 sa_key, u8 type, u8 flags)
1700 {
1701         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1702         struct scsi_sense_hdr sshdr;
1703         int result;
1704         u8 cmd[16] = { 0, };
1705         u8 data[24] = { 0, };
1706
1707         cmd[0] = PERSISTENT_RESERVE_OUT;
1708         cmd[1] = sa;
1709         cmd[2] = type;
1710         put_unaligned_be32(sizeof(data), &cmd[5]);
1711
1712         put_unaligned_be64(key, &data[0]);
1713         put_unaligned_be64(sa_key, &data[8]);
1714         data[20] = flags;
1715
1716         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1717                         &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1718
1719         if ((driver_byte(result) & DRIVER_SENSE) &&
1720             (scsi_sense_valid(&sshdr))) {
1721                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1722                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1723         }
1724
1725         return result;
1726 }
1727
1728 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1729                 u32 flags)
1730 {
1731         if (flags & ~PR_FL_IGNORE_KEY)
1732                 return -EOPNOTSUPP;
1733         return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1734                         old_key, new_key, 0,
1735                         (1 << 0) /* APTPL */);
1736 }
1737
1738 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1739                 u32 flags)
1740 {
1741         if (flags)
1742                 return -EOPNOTSUPP;
1743         return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1744 }
1745
1746 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1747 {
1748         return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1749 }
1750
1751 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1752                 enum pr_type type, bool abort)
1753 {
1754         return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1755                              sd_pr_type(type), 0);
1756 }
1757
1758 static int sd_pr_clear(struct block_device *bdev, u64 key)
1759 {
1760         return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1761 }
1762
1763 static const struct pr_ops sd_pr_ops = {
1764         .pr_register    = sd_pr_register,
1765         .pr_reserve     = sd_pr_reserve,
1766         .pr_release     = sd_pr_release,
1767         .pr_preempt     = sd_pr_preempt,
1768         .pr_clear       = sd_pr_clear,
1769 };
1770
1771 static const struct block_device_operations sd_fops = {
1772         .owner                  = THIS_MODULE,
1773         .open                   = sd_open,
1774         .release                = sd_release,
1775         .ioctl                  = sd_ioctl,
1776         .getgeo                 = sd_getgeo,
1777 #ifdef CONFIG_COMPAT
1778         .compat_ioctl           = sd_compat_ioctl,
1779 #endif
1780         .check_events           = sd_check_events,
1781         .revalidate_disk        = sd_revalidate_disk,
1782         .unlock_native_capacity = sd_unlock_native_capacity,
1783         .pr_ops                 = &sd_pr_ops,
1784 };
1785
1786 /**
1787  *      sd_eh_reset - reset error handling callback
1788  *      @scmd:          sd-issued command that has failed
1789  *
1790  *      This function is called by the SCSI midlayer before starting
1791  *      SCSI EH. When counting medium access failures we have to be
1792  *      careful to register it only only once per device and SCSI EH run;
1793  *      there might be several timed out commands which will cause the
1794  *      'max_medium_access_timeouts' counter to trigger after the first
1795  *      SCSI EH run already and set the device to offline.
1796  *      So this function resets the internal counter before starting SCSI EH.
1797  **/
1798 static void sd_eh_reset(struct scsi_cmnd *scmd)
1799 {
1800         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1801
1802         /* New SCSI EH run, reset gate variable */
1803         sdkp->ignore_medium_access_errors = false;
1804 }
1805
1806 /**
1807  *      sd_eh_action - error handling callback
1808  *      @scmd:          sd-issued command that has failed
1809  *      @eh_disp:       The recovery disposition suggested by the midlayer
1810  *
1811  *      This function is called by the SCSI midlayer upon completion of an
1812  *      error test command (currently TEST UNIT READY). The result of sending
1813  *      the eh command is passed in eh_disp.  We're looking for devices that
1814  *      fail medium access commands but are OK with non access commands like
1815  *      test unit ready (so wrongly see the device as having a successful
1816  *      recovery)
1817  **/
1818 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1819 {
1820         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1821         struct scsi_device *sdev = scmd->device;
1822
1823         if (!scsi_device_online(sdev) ||
1824             !scsi_medium_access_command(scmd) ||
1825             host_byte(scmd->result) != DID_TIME_OUT ||
1826             eh_disp != SUCCESS)
1827                 return eh_disp;
1828
1829         /*
1830          * The device has timed out executing a medium access command.
1831          * However, the TEST UNIT READY command sent during error
1832          * handling completed successfully. Either the device is in the
1833          * process of recovering or has it suffered an internal failure
1834          * that prevents access to the storage medium.
1835          */
1836         if (!sdkp->ignore_medium_access_errors) {
1837                 sdkp->medium_access_timed_out++;
1838                 sdkp->ignore_medium_access_errors = true;
1839         }
1840
1841         /*
1842          * If the device keeps failing read/write commands but TEST UNIT
1843          * READY always completes successfully we assume that medium
1844          * access is no longer possible and take the device offline.
1845          */
1846         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1847                 scmd_printk(KERN_ERR, scmd,
1848                             "Medium access timeout failure. Offlining disk!\n");
1849                 mutex_lock(&sdev->state_mutex);
1850                 scsi_device_set_state(sdev, SDEV_OFFLINE);
1851                 mutex_unlock(&sdev->state_mutex);
1852
1853                 return SUCCESS;
1854         }
1855
1856         return eh_disp;
1857 }
1858
1859 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1860 {
1861         struct request *req = scmd->request;
1862         struct scsi_device *sdev = scmd->device;
1863         unsigned int transferred, good_bytes;
1864         u64 start_lba, end_lba, bad_lba;
1865
1866         /*
1867          * Some commands have a payload smaller than the device logical
1868          * block size (e.g. INQUIRY on a 4K disk).
1869          */
1870         if (scsi_bufflen(scmd) <= sdev->sector_size)
1871                 return 0;
1872
1873         /* Check if we have a 'bad_lba' information */
1874         if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1875                                      SCSI_SENSE_BUFFERSIZE,
1876                                      &bad_lba))
1877                 return 0;
1878
1879         /*
1880          * If the bad lba was reported incorrectly, we have no idea where
1881          * the error is.
1882          */
1883         start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1884         end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1885         if (bad_lba < start_lba || bad_lba >= end_lba)
1886                 return 0;
1887
1888         /*
1889          * resid is optional but mostly filled in.  When it's unused,
1890          * its value is zero, so we assume the whole buffer transferred
1891          */
1892         transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1893
1894         /* This computation should always be done in terms of the
1895          * resolution of the device's medium.
1896          */
1897         good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1898
1899         return min(good_bytes, transferred);
1900 }
1901
1902 /**
1903  *      sd_done - bottom half handler: called when the lower level
1904  *      driver has completed (successfully or otherwise) a scsi command.
1905  *      @SCpnt: mid-level's per command structure.
1906  *
1907  *      Note: potentially run from within an ISR. Must not block.
1908  **/
1909 static int sd_done(struct scsi_cmnd *SCpnt)
1910 {
1911         int result = SCpnt->result;
1912         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1913         unsigned int sector_size = SCpnt->device->sector_size;
1914         unsigned int resid;
1915         struct scsi_sense_hdr sshdr;
1916         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1917         struct request *req = SCpnt->request;
1918         int sense_valid = 0;
1919         int sense_deferred = 0;
1920
1921         switch (req_op(req)) {
1922         case REQ_OP_DISCARD:
1923         case REQ_OP_WRITE_ZEROES:
1924         case REQ_OP_WRITE_SAME:
1925         case REQ_OP_ZONE_RESET:
1926                 if (!result) {
1927                         good_bytes = blk_rq_bytes(req);
1928                         scsi_set_resid(SCpnt, 0);
1929                 } else {
1930                         good_bytes = 0;
1931                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1932                 }
1933                 break;
1934         case REQ_OP_ZONE_REPORT:
1935                 if (!result) {
1936                         good_bytes = scsi_bufflen(SCpnt)
1937                                 - scsi_get_resid(SCpnt);
1938                         scsi_set_resid(SCpnt, 0);
1939                 } else {
1940                         good_bytes = 0;
1941                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1942                 }
1943                 break;
1944         default:
1945                 /*
1946                  * In case of bogus fw or device, we could end up having
1947                  * an unaligned partial completion. Check this here and force
1948                  * alignment.
1949                  */
1950                 resid = scsi_get_resid(SCpnt);
1951                 if (resid & (sector_size - 1)) {
1952                         sd_printk(KERN_INFO, sdkp,
1953                                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1954                                 resid, sector_size);
1955                         resid = min(scsi_bufflen(SCpnt),
1956                                     round_up(resid, sector_size));
1957                         scsi_set_resid(SCpnt, resid);
1958                 }
1959         }
1960
1961         if (result) {
1962                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1963                 if (sense_valid)
1964                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1965         }
1966         sdkp->medium_access_timed_out = 0;
1967
1968         if (driver_byte(result) != DRIVER_SENSE &&
1969             (!sense_valid || sense_deferred))
1970                 goto out;
1971
1972         switch (sshdr.sense_key) {
1973         case HARDWARE_ERROR:
1974         case MEDIUM_ERROR:
1975                 good_bytes = sd_completed_bytes(SCpnt);
1976                 break;
1977         case RECOVERED_ERROR:
1978                 good_bytes = scsi_bufflen(SCpnt);
1979                 break;
1980         case NO_SENSE:
1981                 /* This indicates a false check condition, so ignore it.  An
1982                  * unknown amount of data was transferred so treat it as an
1983                  * error.
1984                  */
1985                 SCpnt->result = 0;
1986                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1987                 break;
1988         case ABORTED_COMMAND:
1989                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
1990                         good_bytes = sd_completed_bytes(SCpnt);
1991                 break;
1992         case ILLEGAL_REQUEST:
1993                 switch (sshdr.asc) {
1994                 case 0x10:      /* DIX: Host detected corruption */
1995                         good_bytes = sd_completed_bytes(SCpnt);
1996                         break;
1997                 case 0x20:      /* INVALID COMMAND OPCODE */
1998                 case 0x24:      /* INVALID FIELD IN CDB */
1999                         switch (SCpnt->cmnd[0]) {
2000                         case UNMAP:
2001                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2002                                 break;
2003                         case WRITE_SAME_16:
2004                         case WRITE_SAME:
2005                                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2006                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
2007                                 } else {
2008                                         sdkp->device->no_write_same = 1;
2009                                         sd_config_write_same(sdkp);
2010                                         req->__data_len = blk_rq_bytes(req);
2011                                         req->rq_flags |= RQF_QUIET;
2012                                 }
2013                                 break;
2014                         }
2015                 }
2016                 break;
2017         default:
2018                 break;
2019         }
2020
2021  out:
2022         if (sd_is_zoned(sdkp))
2023                 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2024
2025         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2026                                            "sd_done: completed %d of %d bytes\n",
2027                                            good_bytes, scsi_bufflen(SCpnt)));
2028
2029         if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
2030                 sd_dif_complete(SCpnt, good_bytes);
2031
2032         return good_bytes;
2033 }
2034
2035 /*
2036  * spinup disk - called only in sd_revalidate_disk()
2037  */
2038 static void
2039 sd_spinup_disk(struct scsi_disk *sdkp)
2040 {
2041         unsigned char cmd[10];
2042         unsigned long spintime_expire = 0;
2043         int retries, spintime;
2044         unsigned int the_result;
2045         struct scsi_sense_hdr sshdr;
2046         int sense_valid = 0;
2047
2048         spintime = 0;
2049
2050         /* Spin up drives, as required.  Only do this at boot time */
2051         /* Spinup needs to be done for module loads too. */
2052         do {
2053                 retries = 0;
2054
2055                 do {
2056                         cmd[0] = TEST_UNIT_READY;
2057                         memset((void *) &cmd[1], 0, 9);
2058
2059                         the_result = scsi_execute_req(sdkp->device, cmd,
2060                                                       DMA_NONE, NULL, 0,
2061                                                       &sshdr, SD_TIMEOUT,
2062                                                       SD_MAX_RETRIES, NULL);
2063
2064                         /*
2065                          * If the drive has indicated to us that it
2066                          * doesn't have any media in it, don't bother
2067                          * with any more polling.
2068                          */
2069                         if (media_not_present(sdkp, &sshdr))
2070                                 return;
2071
2072                         if (the_result)
2073                                 sense_valid = scsi_sense_valid(&sshdr);
2074                         retries++;
2075                 } while (retries < 3 &&
2076                          (!scsi_status_is_good(the_result) ||
2077                           ((driver_byte(the_result) & DRIVER_SENSE) &&
2078                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2079
2080                 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
2081                         /* no sense, TUR either succeeded or failed
2082                          * with a status error */
2083                         if(!spintime && !scsi_status_is_good(the_result)) {
2084                                 sd_print_result(sdkp, "Test Unit Ready failed",
2085                                                 the_result);
2086                         }
2087                         break;
2088                 }
2089
2090                 /*
2091                  * The device does not want the automatic start to be issued.
2092                  */
2093                 if (sdkp->device->no_start_on_add)
2094                         break;
2095
2096                 if (sense_valid && sshdr.sense_key == NOT_READY) {
2097                         if (sshdr.asc == 4 && sshdr.ascq == 3)
2098                                 break;  /* manual intervention required */
2099                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2100                                 break;  /* standby */
2101                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2102                                 break;  /* unavailable */
2103                         /*
2104                          * Issue command to spin up drive when not ready
2105                          */
2106                         if (!spintime) {
2107                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2108                                 cmd[0] = START_STOP;
2109                                 cmd[1] = 1;     /* Return immediately */
2110                                 memset((void *) &cmd[2], 0, 8);
2111                                 cmd[4] = 1;     /* Start spin cycle */
2112                                 if (sdkp->device->start_stop_pwr_cond)
2113                                         cmd[4] |= 1 << 4;
2114                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2115                                                  NULL, 0, &sshdr,
2116                                                  SD_TIMEOUT, SD_MAX_RETRIES,
2117                                                  NULL);
2118                                 spintime_expire = jiffies + 100 * HZ;
2119                                 spintime = 1;
2120                         }
2121                         /* Wait 1 second for next try */
2122                         msleep(1000);
2123                         printk(".");
2124
2125                 /*
2126                  * Wait for USB flash devices with slow firmware.
2127                  * Yes, this sense key/ASC combination shouldn't
2128                  * occur here.  It's characteristic of these devices.
2129                  */
2130                 } else if (sense_valid &&
2131                                 sshdr.sense_key == UNIT_ATTENTION &&
2132                                 sshdr.asc == 0x28) {
2133                         if (!spintime) {
2134                                 spintime_expire = jiffies + 5 * HZ;
2135                                 spintime = 1;
2136                         }
2137                         /* Wait 1 second for next try */
2138                         msleep(1000);
2139                 } else {
2140                         /* we don't understand the sense code, so it's
2141                          * probably pointless to loop */
2142                         if(!spintime) {
2143                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2144                                 sd_print_sense_hdr(sdkp, &sshdr);
2145                         }
2146                         break;
2147                 }
2148
2149         } while (spintime && time_before_eq(jiffies, spintime_expire));
2150
2151         if (spintime) {
2152                 if (scsi_status_is_good(the_result))
2153                         printk("ready\n");
2154                 else
2155                         printk("not responding...\n");
2156         }
2157 }
2158
2159 /*
2160  * Determine whether disk supports Data Integrity Field.
2161  */
2162 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2163 {
2164         struct scsi_device *sdp = sdkp->device;
2165         u8 type;
2166         int ret = 0;
2167
2168         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2169                 return ret;
2170
2171         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2172
2173         if (type > T10_PI_TYPE3_PROTECTION)
2174                 ret = -ENODEV;
2175         else if (scsi_host_dif_capable(sdp->host, type))
2176                 ret = 1;
2177
2178         if (sdkp->first_scan || type != sdkp->protection_type)
2179                 switch (ret) {
2180                 case -ENODEV:
2181                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2182                                   " protection type %u. Disabling disk!\n",
2183                                   type);
2184                         break;
2185                 case 1:
2186                         sd_printk(KERN_NOTICE, sdkp,
2187                                   "Enabling DIF Type %u protection\n", type);
2188                         break;
2189                 case 0:
2190                         sd_printk(KERN_NOTICE, sdkp,
2191                                   "Disabling DIF Type %u protection\n", type);
2192                         break;
2193                 }
2194
2195         sdkp->protection_type = type;
2196
2197         return ret;
2198 }
2199
2200 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2201                         struct scsi_sense_hdr *sshdr, int sense_valid,
2202                         int the_result)
2203 {
2204         if (driver_byte(the_result) & DRIVER_SENSE)
2205                 sd_print_sense_hdr(sdkp, sshdr);
2206         else
2207                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2208
2209         /*
2210          * Set dirty bit for removable devices if not ready -
2211          * sometimes drives will not report this properly.
2212          */
2213         if (sdp->removable &&
2214             sense_valid && sshdr->sense_key == NOT_READY)
2215                 set_media_not_present(sdkp);
2216
2217         /*
2218          * We used to set media_present to 0 here to indicate no media
2219          * in the drive, but some drives fail read capacity even with
2220          * media present, so we can't do that.
2221          */
2222         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2223 }
2224
2225 #define RC16_LEN 32
2226 #if RC16_LEN > SD_BUF_SIZE
2227 #error RC16_LEN must not be more than SD_BUF_SIZE
2228 #endif
2229
2230 #define READ_CAPACITY_RETRIES_ON_RESET  10
2231
2232 /*
2233  * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
2234  * and the reported logical block size is bigger than 512 bytes. Note
2235  * that last_sector is a u64 and therefore logical_to_sectors() is not
2236  * applicable.
2237  */
2238 static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
2239 {
2240         u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
2241
2242         if (sizeof(sector_t) == 4 && last_sector > U32_MAX)
2243                 return false;
2244
2245         return true;
2246 }
2247
2248 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2249                                                 unsigned char *buffer)
2250 {
2251         unsigned char cmd[16];
2252         struct scsi_sense_hdr sshdr;
2253         int sense_valid = 0;
2254         int the_result;
2255         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2256         unsigned int alignment;
2257         unsigned long long lba;
2258         unsigned sector_size;
2259
2260         if (sdp->no_read_capacity_16)
2261                 return -EINVAL;
2262
2263         do {
2264                 memset(cmd, 0, 16);
2265                 cmd[0] = SERVICE_ACTION_IN_16;
2266                 cmd[1] = SAI_READ_CAPACITY_16;
2267                 cmd[13] = RC16_LEN;
2268                 memset(buffer, 0, RC16_LEN);
2269
2270                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2271                                         buffer, RC16_LEN, &sshdr,
2272                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2273
2274                 if (media_not_present(sdkp, &sshdr))
2275                         return -ENODEV;
2276
2277                 if (the_result) {
2278                         sense_valid = scsi_sense_valid(&sshdr);
2279                         if (sense_valid &&
2280                             sshdr.sense_key == ILLEGAL_REQUEST &&
2281                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2282                             sshdr.ascq == 0x00)
2283                                 /* Invalid Command Operation Code or
2284                                  * Invalid Field in CDB, just retry
2285                                  * silently with RC10 */
2286                                 return -EINVAL;
2287                         if (sense_valid &&
2288                             sshdr.sense_key == UNIT_ATTENTION &&
2289                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2290                                 /* Device reset might occur several times,
2291                                  * give it one more chance */
2292                                 if (--reset_retries > 0)
2293                                         continue;
2294                 }
2295                 retries--;
2296
2297         } while (the_result && retries);
2298
2299         if (the_result) {
2300                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2301                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2302                 return -EINVAL;
2303         }
2304
2305         sector_size = get_unaligned_be32(&buffer[8]);
2306         lba = get_unaligned_be64(&buffer[0]);
2307
2308         if (sd_read_protection_type(sdkp, buffer) < 0) {
2309                 sdkp->capacity = 0;
2310                 return -ENODEV;
2311         }
2312
2313         if (!sd_addressable_capacity(lba, sector_size)) {
2314                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2315                         "kernel compiled with support for large block "
2316                         "devices.\n");
2317                 sdkp->capacity = 0;
2318                 return -EOVERFLOW;
2319         }
2320
2321         /* Logical blocks per physical block exponent */
2322         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2323
2324         /* RC basis */
2325         sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2326
2327         /* Lowest aligned logical block */
2328         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2329         blk_queue_alignment_offset(sdp->request_queue, alignment);
2330         if (alignment && sdkp->first_scan)
2331                 sd_printk(KERN_NOTICE, sdkp,
2332                           "physical block alignment offset: %u\n", alignment);
2333
2334         if (buffer[14] & 0x80) { /* LBPME */
2335                 sdkp->lbpme = 1;
2336
2337                 if (buffer[14] & 0x40) /* LBPRZ */
2338                         sdkp->lbprz = 1;
2339
2340                 sd_config_discard(sdkp, SD_LBP_WS16);
2341         }
2342
2343         sdkp->capacity = lba + 1;
2344         return sector_size;
2345 }
2346
2347 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2348                                                 unsigned char *buffer)
2349 {
2350         unsigned char cmd[16];
2351         struct scsi_sense_hdr sshdr;
2352         int sense_valid = 0;
2353         int the_result;
2354         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2355         sector_t lba;
2356         unsigned sector_size;
2357
2358         do {
2359                 cmd[0] = READ_CAPACITY;
2360                 memset(&cmd[1], 0, 9);
2361                 memset(buffer, 0, 8);
2362
2363                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2364                                         buffer, 8, &sshdr,
2365                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2366
2367                 if (media_not_present(sdkp, &sshdr))
2368                         return -ENODEV;
2369
2370                 if (the_result) {
2371                         sense_valid = scsi_sense_valid(&sshdr);
2372                         if (sense_valid &&
2373                             sshdr.sense_key == UNIT_ATTENTION &&
2374                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2375                                 /* Device reset might occur several times,
2376                                  * give it one more chance */
2377                                 if (--reset_retries > 0)
2378                                         continue;
2379                 }
2380                 retries--;
2381
2382         } while (the_result && retries);
2383
2384         if (the_result) {
2385                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2386                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2387                 return -EINVAL;
2388         }
2389
2390         sector_size = get_unaligned_be32(&buffer[4]);
2391         lba = get_unaligned_be32(&buffer[0]);
2392
2393         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2394                 /* Some buggy (usb cardreader) devices return an lba of
2395                    0xffffffff when the want to report a size of 0 (with
2396                    which they really mean no media is present) */
2397                 sdkp->capacity = 0;
2398                 sdkp->physical_block_size = sector_size;
2399                 return sector_size;
2400         }
2401
2402         if (!sd_addressable_capacity(lba, sector_size)) {
2403                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2404                         "kernel compiled with support for large block "
2405                         "devices.\n");
2406                 sdkp->capacity = 0;
2407                 return -EOVERFLOW;
2408         }
2409
2410         sdkp->capacity = lba + 1;
2411         sdkp->physical_block_size = sector_size;
2412         return sector_size;
2413 }
2414
2415 static int sd_try_rc16_first(struct scsi_device *sdp)
2416 {
2417         if (sdp->host->max_cmd_len < 16)
2418                 return 0;
2419         if (sdp->try_rc_10_first)
2420                 return 0;
2421         if (sdp->scsi_level > SCSI_SPC_2)
2422                 return 1;
2423         if (scsi_device_protection(sdp))
2424                 return 1;
2425         return 0;
2426 }
2427
2428 /*
2429  * read disk capacity
2430  */
2431 static void
2432 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2433 {
2434         int sector_size;
2435         struct scsi_device *sdp = sdkp->device;
2436
2437         if (sd_try_rc16_first(sdp)) {
2438                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2439                 if (sector_size == -EOVERFLOW)
2440                         goto got_data;
2441                 if (sector_size == -ENODEV)
2442                         return;
2443                 if (sector_size < 0)
2444                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2445                 if (sector_size < 0)
2446                         return;
2447         } else {
2448                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2449                 if (sector_size == -EOVERFLOW)
2450                         goto got_data;
2451                 if (sector_size < 0)
2452                         return;
2453                 if ((sizeof(sdkp->capacity) > 4) &&
2454                     (sdkp->capacity > 0xffffffffULL)) {
2455                         int old_sector_size = sector_size;
2456                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2457                                         "Trying to use READ CAPACITY(16).\n");
2458                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2459                         if (sector_size < 0) {
2460                                 sd_printk(KERN_NOTICE, sdkp,
2461                                         "Using 0xffffffff as device size\n");
2462                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2463                                 sector_size = old_sector_size;
2464                                 goto got_data;
2465                         }
2466                 }
2467         }
2468
2469         /* Some devices are known to return the total number of blocks,
2470          * not the highest block number.  Some devices have versions
2471          * which do this and others which do not.  Some devices we might
2472          * suspect of doing this but we don't know for certain.
2473          *
2474          * If we know the reported capacity is wrong, decrement it.  If
2475          * we can only guess, then assume the number of blocks is even
2476          * (usually true but not always) and err on the side of lowering
2477          * the capacity.
2478          */
2479         if (sdp->fix_capacity ||
2480             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2481                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2482                                 "from its reported value: %llu\n",
2483                                 (unsigned long long) sdkp->capacity);
2484                 --sdkp->capacity;
2485         }
2486
2487 got_data:
2488         if (sector_size == 0) {
2489                 sector_size = 512;
2490                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2491                           "assuming 512.\n");
2492         }
2493
2494         if (sector_size != 512 &&
2495             sector_size != 1024 &&
2496             sector_size != 2048 &&
2497             sector_size != 4096) {
2498                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2499                           sector_size);
2500                 /*
2501                  * The user might want to re-format the drive with
2502                  * a supported sectorsize.  Once this happens, it
2503                  * would be relatively trivial to set the thing up.
2504                  * For this reason, we leave the thing in the table.
2505                  */
2506                 sdkp->capacity = 0;
2507                 /*
2508                  * set a bogus sector size so the normal read/write
2509                  * logic in the block layer will eventually refuse any
2510                  * request on this device without tripping over power
2511                  * of two sector size assumptions
2512                  */
2513                 sector_size = 512;
2514         }
2515         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2516         blk_queue_physical_block_size(sdp->request_queue,
2517                                       sdkp->physical_block_size);
2518         sdkp->device->sector_size = sector_size;
2519
2520         if (sdkp->capacity > 0xffffffff)
2521                 sdp->use_16_for_rw = 1;
2522
2523 }
2524
2525 /*
2526  * Print disk capacity
2527  */
2528 static void
2529 sd_print_capacity(struct scsi_disk *sdkp,
2530                   sector_t old_capacity)
2531 {
2532         int sector_size = sdkp->device->sector_size;
2533         char cap_str_2[10], cap_str_10[10];
2534
2535         string_get_size(sdkp->capacity, sector_size,
2536                         STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2537         string_get_size(sdkp->capacity, sector_size,
2538                         STRING_UNITS_10, cap_str_10,
2539                         sizeof(cap_str_10));
2540
2541         if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2542                 sd_printk(KERN_NOTICE, sdkp,
2543                           "%llu %d-byte logical blocks: (%s/%s)\n",
2544                           (unsigned long long)sdkp->capacity,
2545                           sector_size, cap_str_10, cap_str_2);
2546
2547                 if (sdkp->physical_block_size != sector_size)
2548                         sd_printk(KERN_NOTICE, sdkp,
2549                                   "%u-byte physical blocks\n",
2550                                   sdkp->physical_block_size);
2551
2552                 sd_zbc_print_zones(sdkp);
2553         }
2554 }
2555
2556 /* called with buffer of length 512 */
2557 static inline int
2558 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2559                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2560                  struct scsi_sense_hdr *sshdr)
2561 {
2562         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2563                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2564                                sshdr);
2565 }
2566
2567 /*
2568  * read write protect setting, if possible - called only in sd_revalidate_disk()
2569  * called with buffer of length SD_BUF_SIZE
2570  */
2571 static void
2572 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2573 {
2574         int res;
2575         struct scsi_device *sdp = sdkp->device;
2576         struct scsi_mode_data data;
2577         int old_wp = sdkp->write_prot;
2578
2579         set_disk_ro(sdkp->disk, 0);
2580         if (sdp->skip_ms_page_3f) {
2581                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2582                 return;
2583         }
2584
2585         if (sdp->use_192_bytes_for_3f) {
2586                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2587         } else {
2588                 /*
2589                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2590                  * We have to start carefully: some devices hang if we ask
2591                  * for more than is available.
2592                  */
2593                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2594
2595                 /*
2596                  * Second attempt: ask for page 0 When only page 0 is
2597                  * implemented, a request for page 3F may return Sense Key
2598                  * 5: Illegal Request, Sense Code 24: Invalid field in
2599                  * CDB.
2600                  */
2601                 if (!scsi_status_is_good(res))
2602                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2603
2604                 /*
2605                  * Third attempt: ask 255 bytes, as we did earlier.
2606                  */
2607                 if (!scsi_status_is_good(res))
2608                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2609                                                &data, NULL);
2610         }
2611
2612         if (!scsi_status_is_good(res)) {
2613                 sd_first_printk(KERN_WARNING, sdkp,
2614                           "Test WP failed, assume Write Enabled\n");
2615         } else {
2616                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2617                 set_disk_ro(sdkp->disk, sdkp->write_prot);
2618                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2619                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2620                                   sdkp->write_prot ? "on" : "off");
2621                         sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2622                 }
2623         }
2624 }
2625
2626 /*
2627  * sd_read_cache_type - called only from sd_revalidate_disk()
2628  * called with buffer of length SD_BUF_SIZE
2629  */
2630 static void
2631 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2632 {
2633         int len = 0, res;
2634         struct scsi_device *sdp = sdkp->device;
2635
2636         int dbd;
2637         int modepage;
2638         int first_len;
2639         struct scsi_mode_data data;
2640         struct scsi_sense_hdr sshdr;
2641         int old_wce = sdkp->WCE;
2642         int old_rcd = sdkp->RCD;
2643         int old_dpofua = sdkp->DPOFUA;
2644
2645
2646         if (sdkp->cache_override)
2647                 return;
2648
2649         first_len = 4;
2650         if (sdp->skip_ms_page_8) {
2651                 if (sdp->type == TYPE_RBC)
2652                         goto defaults;
2653                 else {
2654                         if (sdp->skip_ms_page_3f)
2655                                 goto defaults;
2656                         modepage = 0x3F;
2657                         if (sdp->use_192_bytes_for_3f)
2658                                 first_len = 192;
2659                         dbd = 0;
2660                 }
2661         } else if (sdp->type == TYPE_RBC) {
2662                 modepage = 6;
2663                 dbd = 8;
2664         } else {
2665                 modepage = 8;
2666                 dbd = 0;
2667         }
2668
2669         /* cautiously ask */
2670         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2671                         &data, &sshdr);
2672
2673         if (!scsi_status_is_good(res))
2674                 goto bad_sense;
2675
2676         if (!data.header_length) {
2677                 modepage = 6;
2678                 first_len = 0;
2679                 sd_first_printk(KERN_ERR, sdkp,
2680                                 "Missing header in MODE_SENSE response\n");
2681         }
2682
2683         /* that went OK, now ask for the proper length */
2684         len = data.length;
2685
2686         /*
2687          * We're only interested in the first three bytes, actually.
2688          * But the data cache page is defined for the first 20.
2689          */
2690         if (len < 3)
2691                 goto bad_sense;
2692         else if (len > SD_BUF_SIZE) {
2693                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2694                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2695                 len = SD_BUF_SIZE;
2696         }
2697         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2698                 len = 192;
2699
2700         /* Get the data */
2701         if (len > first_len)
2702                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2703                                 &data, &sshdr);
2704
2705         if (scsi_status_is_good(res)) {
2706                 int offset = data.header_length + data.block_descriptor_length;
2707
2708                 while (offset < len) {
2709                         u8 page_code = buffer[offset] & 0x3F;
2710                         u8 spf       = buffer[offset] & 0x40;
2711
2712                         if (page_code == 8 || page_code == 6) {
2713                                 /* We're interested only in the first 3 bytes.
2714                                  */
2715                                 if (len - offset <= 2) {
2716                                         sd_first_printk(KERN_ERR, sdkp,
2717                                                 "Incomplete mode parameter "
2718                                                         "data\n");
2719                                         goto defaults;
2720                                 } else {
2721                                         modepage = page_code;
2722                                         goto Page_found;
2723                                 }
2724                         } else {
2725                                 /* Go to the next page */
2726                                 if (spf && len - offset > 3)
2727                                         offset += 4 + (buffer[offset+2] << 8) +
2728                                                 buffer[offset+3];
2729                                 else if (!spf && len - offset > 1)
2730                                         offset += 2 + buffer[offset+1];
2731                                 else {
2732                                         sd_first_printk(KERN_ERR, sdkp,
2733                                                         "Incomplete mode "
2734                                                         "parameter data\n");
2735                                         goto defaults;
2736                                 }
2737                         }
2738                 }
2739
2740                 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2741                 goto defaults;
2742
2743         Page_found:
2744                 if (modepage == 8) {
2745                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2746                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2747                 } else {
2748                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2749                         sdkp->RCD = 0;
2750                 }
2751
2752                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2753                 if (sdp->broken_fua) {
2754                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2755                         sdkp->DPOFUA = 0;
2756                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2757                            !sdkp->device->use_16_for_rw) {
2758                         sd_first_printk(KERN_NOTICE, sdkp,
2759                                   "Uses READ/WRITE(6), disabling FUA\n");
2760                         sdkp->DPOFUA = 0;
2761                 }
2762
2763                 /* No cache flush allowed for write protected devices */
2764                 if (sdkp->WCE && sdkp->write_prot)
2765                         sdkp->WCE = 0;
2766
2767                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2768                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2769                         sd_printk(KERN_NOTICE, sdkp,
2770                                   "Write cache: %s, read cache: %s, %s\n",
2771                                   sdkp->WCE ? "enabled" : "disabled",
2772                                   sdkp->RCD ? "disabled" : "enabled",
2773                                   sdkp->DPOFUA ? "supports DPO and FUA"
2774                                   : "doesn't support DPO or FUA");
2775
2776                 return;
2777         }
2778
2779 bad_sense:
2780         if (scsi_sense_valid(&sshdr) &&
2781             sshdr.sense_key == ILLEGAL_REQUEST &&
2782             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2783                 /* Invalid field in CDB */
2784                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2785         else
2786                 sd_first_printk(KERN_ERR, sdkp,
2787                                 "Asking for cache data failed\n");
2788
2789 defaults:
2790         if (sdp->wce_default_on) {
2791                 sd_first_printk(KERN_NOTICE, sdkp,
2792                                 "Assuming drive cache: write back\n");
2793                 sdkp->WCE = 1;
2794         } else {
2795                 sd_first_printk(KERN_ERR, sdkp,
2796                                 "Assuming drive cache: write through\n");
2797                 sdkp->WCE = 0;
2798         }
2799         sdkp->RCD = 0;
2800         sdkp->DPOFUA = 0;
2801 }
2802
2803 /*
2804  * The ATO bit indicates whether the DIF application tag is available
2805  * for use by the operating system.
2806  */
2807 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2808 {
2809         int res, offset;
2810         struct scsi_device *sdp = sdkp->device;
2811         struct scsi_mode_data data;
2812         struct scsi_sense_hdr sshdr;
2813
2814         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2815                 return;
2816
2817         if (sdkp->protection_type == 0)
2818                 return;
2819
2820         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2821                               SD_MAX_RETRIES, &data, &sshdr);
2822
2823         if (!scsi_status_is_good(res) || !data.header_length ||
2824             data.length < 6) {
2825                 sd_first_printk(KERN_WARNING, sdkp,
2826                           "getting Control mode page failed, assume no ATO\n");
2827
2828                 if (scsi_sense_valid(&sshdr))
2829                         sd_print_sense_hdr(sdkp, &sshdr);
2830
2831                 return;
2832         }
2833
2834         offset = data.header_length + data.block_descriptor_length;
2835
2836         if ((buffer[offset] & 0x3f) != 0x0a) {
2837                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2838                 return;
2839         }
2840
2841         if ((buffer[offset + 5] & 0x80) == 0)
2842                 return;
2843
2844         sdkp->ATO = 1;
2845
2846         return;
2847 }
2848
2849 /**
2850  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2851  * @sdkp: disk to query
2852  */
2853 static void sd_read_block_limits(struct scsi_disk *sdkp)
2854 {
2855         unsigned int sector_sz = sdkp->device->sector_size;
2856         const int vpd_len = 64;
2857         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2858
2859         if (!buffer ||
2860             /* Block Limits VPD */
2861             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2862                 goto out;
2863
2864         blk_queue_io_min(sdkp->disk->queue,
2865                          get_unaligned_be16(&buffer[6]) * sector_sz);
2866
2867         sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2868         sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2869
2870         if (buffer[3] == 0x3c) {
2871                 unsigned int lba_count, desc_count;
2872
2873                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2874
2875                 if (!sdkp->lbpme)
2876                         goto out;
2877
2878                 lba_count = get_unaligned_be32(&buffer[20]);
2879                 desc_count = get_unaligned_be32(&buffer[24]);
2880
2881                 if (lba_count && desc_count)
2882                         sdkp->max_unmap_blocks = lba_count;
2883
2884                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2885
2886                 if (buffer[32] & 0x80)
2887                         sdkp->unmap_alignment =
2888                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2889
2890                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2891
2892                         if (sdkp->max_unmap_blocks)
2893                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2894                         else
2895                                 sd_config_discard(sdkp, SD_LBP_WS16);
2896
2897                 } else {        /* LBP VPD page tells us what to use */
2898                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2899                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2900                         else if (sdkp->lbpws)
2901                                 sd_config_discard(sdkp, SD_LBP_WS16);
2902                         else if (sdkp->lbpws10)
2903                                 sd_config_discard(sdkp, SD_LBP_WS10);
2904                         else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2905                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2906                         else
2907                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2908                 }
2909         }
2910
2911  out:
2912         kfree(buffer);
2913 }
2914
2915 /**
2916  * sd_read_block_characteristics - Query block dev. characteristics
2917  * @sdkp: disk to query
2918  */
2919 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2920 {
2921         struct request_queue *q = sdkp->disk->queue;
2922         unsigned char *buffer;
2923         u16 rot;
2924         const int vpd_len = 64;
2925
2926         buffer = kmalloc(vpd_len, GFP_KERNEL);
2927
2928         if (!buffer ||
2929             /* Block Device Characteristics VPD */
2930             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2931                 goto out;
2932
2933         rot = get_unaligned_be16(&buffer[4]);
2934
2935         if (rot == 1) {
2936                 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
2937                 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
2938         }
2939
2940         if (sdkp->device->type == TYPE_ZBC) {
2941                 /* Host-managed */
2942                 q->limits.zoned = BLK_ZONED_HM;
2943         } else {
2944                 sdkp->zoned = (buffer[8] >> 4) & 3;
2945                 if (sdkp->zoned == 1)
2946                         /* Host-aware */
2947                         q->limits.zoned = BLK_ZONED_HA;
2948                 else
2949                         /*
2950                          * Treat drive-managed devices as
2951                          * regular block devices.
2952                          */
2953                         q->limits.zoned = BLK_ZONED_NONE;
2954         }
2955         if (blk_queue_is_zoned(q) && sdkp->first_scan)
2956                 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2957                       q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2958
2959  out:
2960         kfree(buffer);
2961 }
2962
2963 /**
2964  * sd_read_block_provisioning - Query provisioning VPD page
2965  * @sdkp: disk to query
2966  */
2967 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2968 {
2969         unsigned char *buffer;
2970         const int vpd_len = 8;
2971
2972         if (sdkp->lbpme == 0)
2973                 return;
2974
2975         buffer = kmalloc(vpd_len, GFP_KERNEL);
2976
2977         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2978                 goto out;
2979
2980         sdkp->lbpvpd    = 1;
2981         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2982         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2983         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2984
2985  out:
2986         kfree(buffer);
2987 }
2988
2989 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2990 {
2991         struct scsi_device *sdev = sdkp->device;
2992
2993         if (sdev->host->no_write_same) {
2994                 sdev->no_write_same = 1;
2995
2996                 return;
2997         }
2998
2999         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
3000                 /* too large values might cause issues with arcmsr */
3001                 int vpd_buf_len = 64;
3002
3003                 sdev->no_report_opcodes = 1;
3004
3005                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3006                  * CODES is unsupported and the device has an ATA
3007                  * Information VPD page (SAT).
3008                  */
3009                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3010                         sdev->no_write_same = 1;
3011         }
3012
3013         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3014                 sdkp->ws16 = 1;
3015
3016         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3017                 sdkp->ws10 = 1;
3018 }
3019
3020 /**
3021  *      sd_revalidate_disk - called the first time a new disk is seen,
3022  *      performs disk spin up, read_capacity, etc.
3023  *      @disk: struct gendisk we care about
3024  **/
3025 static int sd_revalidate_disk(struct gendisk *disk)
3026 {
3027         struct scsi_disk *sdkp = scsi_disk(disk);
3028         struct scsi_device *sdp = sdkp->device;
3029         struct request_queue *q = sdkp->disk->queue;
3030         sector_t old_capacity = sdkp->capacity;
3031         unsigned char *buffer;
3032         unsigned int dev_max, rw_max;
3033
3034         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3035                                       "sd_revalidate_disk\n"));
3036
3037         /*
3038          * If the device is offline, don't try and read capacity or any
3039          * of the other niceties.
3040          */
3041         if (!scsi_device_online(sdp))
3042                 goto out;
3043
3044         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3045         if (!buffer) {
3046                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3047                           "allocation failure.\n");
3048                 goto out;
3049         }
3050
3051         sd_spinup_disk(sdkp);
3052
3053         /*
3054          * Without media there is no reason to ask; moreover, some devices
3055          * react badly if we do.
3056          */
3057         if (sdkp->media_present) {
3058                 sd_read_capacity(sdkp, buffer);
3059
3060                 if (scsi_device_supports_vpd(sdp)) {
3061                         sd_read_block_provisioning(sdkp);
3062                         sd_read_block_limits(sdkp);
3063                         sd_read_block_characteristics(sdkp);
3064                         sd_zbc_read_zones(sdkp, buffer);
3065                 }
3066
3067                 sd_print_capacity(sdkp, old_capacity);
3068
3069                 sd_read_write_protect_flag(sdkp, buffer);
3070                 sd_read_cache_type(sdkp, buffer);
3071                 sd_read_app_tag_own(sdkp, buffer);
3072                 sd_read_write_same(sdkp, buffer);
3073         }
3074
3075         sdkp->first_scan = 0;
3076
3077         /*
3078          * We now have all cache related info, determine how we deal
3079          * with flush requests.
3080          */
3081         sd_set_flush_flag(sdkp);
3082
3083         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3084         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3085
3086         /* Some devices report a maximum block count for READ/WRITE requests. */
3087         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3088         q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3089
3090         /*
3091          * Use the device's preferred I/O size for reads and writes
3092          * unless the reported value is unreasonably small, large, or
3093          * garbage.
3094          */
3095         if (sdkp->opt_xfer_blocks &&
3096             sdkp->opt_xfer_blocks <= dev_max &&
3097             sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
3098             logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
3099                 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3100                 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3101         } else
3102                 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3103                                       (sector_t)BLK_DEF_MAX_SECTORS);
3104
3105         /* Combine with controller limits */
3106         q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
3107
3108         set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3109         sd_config_write_same(sdkp);
3110         kfree(buffer);
3111
3112  out:
3113         return 0;
3114 }
3115
3116 /**
3117  *      sd_unlock_native_capacity - unlock native capacity
3118  *      @disk: struct gendisk to set capacity for
3119  *
3120  *      Block layer calls this function if it detects that partitions
3121  *      on @disk reach beyond the end of the device.  If the SCSI host
3122  *      implements ->unlock_native_capacity() method, it's invoked to
3123  *      give it a chance to adjust the device capacity.
3124  *
3125  *      CONTEXT:
3126  *      Defined by block layer.  Might sleep.
3127  */
3128 static void sd_unlock_native_capacity(struct gendisk *disk)
3129 {
3130         struct scsi_device *sdev = scsi_disk(disk)->device;
3131
3132         if (sdev->host->hostt->unlock_native_capacity)
3133                 sdev->host->hostt->unlock_native_capacity(sdev);
3134 }
3135
3136 /**
3137  *      sd_format_disk_name - format disk name
3138  *      @prefix: name prefix - ie. "sd" for SCSI disks
3139  *      @index: index of the disk to format name for
3140  *      @buf: output buffer
3141  *      @buflen: length of the output buffer
3142  *
3143  *      SCSI disk names starts at sda.  The 26th device is sdz and the
3144  *      27th is sdaa.  The last one for two lettered suffix is sdzz
3145  *      which is followed by sdaaa.
3146  *
3147  *      This is basically 26 base counting with one extra 'nil' entry
3148  *      at the beginning from the second digit on and can be
3149  *      determined using similar method as 26 base conversion with the
3150  *      index shifted -1 after each digit is computed.
3151  *
3152  *      CONTEXT:
3153  *      Don't care.
3154  *
3155  *      RETURNS:
3156  *      0 on success, -errno on failure.
3157  */
3158 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3159 {
3160         const int base = 'z' - 'a' + 1;
3161         char *begin = buf + strlen(prefix);
3162         char *end = buf + buflen;
3163         char *p;
3164         int unit;
3165
3166         p = end - 1;
3167         *p = '\0';
3168         unit = base;
3169         do {
3170                 if (p == begin)
3171                         return -EINVAL;
3172                 *--p = 'a' + (index % unit);
3173                 index = (index / unit) - 1;
3174         } while (index >= 0);
3175
3176         memmove(begin, p, end - p);
3177         memcpy(buf, prefix, strlen(prefix));
3178
3179         return 0;
3180 }
3181
3182 /*
3183  * The asynchronous part of sd_probe
3184  */
3185 static void sd_probe_async(void *data, async_cookie_t cookie)
3186 {
3187         struct scsi_disk *sdkp = data;
3188         struct scsi_device *sdp;
3189         struct gendisk *gd;
3190         u32 index;
3191         struct device *dev;
3192
3193         sdp = sdkp->device;
3194         gd = sdkp->disk;
3195         index = sdkp->index;
3196         dev = &sdp->sdev_gendev;
3197
3198         gd->major = sd_major((index & 0xf0) >> 4);
3199         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3200         gd->minors = SD_MINORS;
3201
3202         gd->fops = &sd_fops;
3203         gd->private_data = &sdkp->driver;
3204         gd->queue = sdkp->device->request_queue;
3205
3206         /* defaults, until the device tells us otherwise */
3207         sdp->sector_size = 512;
3208         sdkp->capacity = 0;
3209         sdkp->media_present = 1;
3210         sdkp->write_prot = 0;
3211         sdkp->cache_override = 0;
3212         sdkp->WCE = 0;
3213         sdkp->RCD = 0;
3214         sdkp->ATO = 0;
3215         sdkp->first_scan = 1;
3216         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3217
3218         sd_revalidate_disk(gd);
3219
3220         gd->flags = GENHD_FL_EXT_DEVT;
3221         if (sdp->removable) {
3222                 gd->flags |= GENHD_FL_REMOVABLE;
3223                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3224         }
3225
3226         blk_pm_runtime_init(sdp->request_queue, dev);
3227         device_add_disk(dev, gd);
3228         if (sdkp->capacity)
3229                 sd_dif_config_host(sdkp);
3230
3231         sd_revalidate_disk(gd);
3232
3233         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3234                   sdp->removable ? "removable " : "");
3235         scsi_autopm_put_device(sdp);
3236         put_device(&sdkp->dev);
3237 }
3238
3239 /**
3240  *      sd_probe - called during driver initialization and whenever a
3241  *      new scsi device is attached to the system. It is called once
3242  *      for each scsi device (not just disks) present.
3243  *      @dev: pointer to device object
3244  *
3245  *      Returns 0 if successful (or not interested in this scsi device
3246  *      (e.g. scanner)); 1 when there is an error.
3247  *
3248  *      Note: this function is invoked from the scsi mid-level.
3249  *      This function sets up the mapping between a given
3250  *      <host,channel,id,lun> (found in sdp) and new device name
3251  *      (e.g. /dev/sda). More precisely it is the block device major
3252  *      and minor number that is chosen here.
3253  *
3254  *      Assume sd_probe is not re-entrant (for time being)
3255  *      Also think about sd_probe() and sd_remove() running coincidentally.
3256  **/
3257 static int sd_probe(struct device *dev)
3258 {
3259         struct scsi_device *sdp = to_scsi_device(dev);
3260         struct scsi_disk *sdkp;
3261         struct gendisk *gd;
3262         int index;
3263         int error;
3264
3265         scsi_autopm_get_device(sdp);
3266         error = -ENODEV;
3267         if (sdp->type != TYPE_DISK &&
3268             sdp->type != TYPE_ZBC &&
3269             sdp->type != TYPE_MOD &&
3270             sdp->type != TYPE_RBC)
3271                 goto out;
3272
3273 #ifndef CONFIG_BLK_DEV_ZONED
3274         if (sdp->type == TYPE_ZBC)
3275                 goto out;
3276 #endif
3277         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3278                                         "sd_probe\n"));
3279
3280         error = -ENOMEM;
3281         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3282         if (!sdkp)
3283                 goto out;
3284
3285         gd = alloc_disk(SD_MINORS);
3286         if (!gd)
3287                 goto out_free;
3288
3289         do {
3290                 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3291                         goto out_put;
3292
3293                 spin_lock(&sd_index_lock);
3294                 error = ida_get_new(&sd_index_ida, &index);
3295                 spin_unlock(&sd_index_lock);
3296         } while (error == -EAGAIN);
3297
3298         if (error) {
3299                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3300                 goto out_put;
3301         }
3302
3303         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3304         if (error) {
3305                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3306                 goto out_free_index;
3307         }
3308
3309         sdkp->device = sdp;
3310         sdkp->driver = &sd_template;
3311         sdkp->disk = gd;
3312         sdkp->index = index;
3313         atomic_set(&sdkp->openers, 0);
3314         atomic_set(&sdkp->device->ioerr_cnt, 0);
3315
3316         if (!sdp->request_queue->rq_timeout) {
3317                 if (sdp->type != TYPE_MOD)
3318                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3319                 else
3320                         blk_queue_rq_timeout(sdp->request_queue,
3321                                              SD_MOD_TIMEOUT);
3322         }
3323
3324         device_initialize(&sdkp->dev);
3325         sdkp->dev.parent = dev;
3326         sdkp->dev.class = &sd_disk_class;
3327         dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3328
3329         error = device_add(&sdkp->dev);
3330         if (error)
3331                 goto out_free_index;
3332
3333         get_device(dev);
3334         dev_set_drvdata(dev, sdkp);
3335
3336         get_device(&sdkp->dev); /* prevent release before async_schedule */
3337         async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3338
3339         return 0;
3340
3341  out_free_index:
3342         spin_lock(&sd_index_lock);
3343         ida_remove(&sd_index_ida, index);
3344         spin_unlock(&sd_index_lock);
3345  out_put:
3346         put_disk(gd);
3347  out_free:
3348         kfree(sdkp);
3349  out:
3350         scsi_autopm_put_device(sdp);
3351         return error;
3352 }
3353
3354 /**
3355  *      sd_remove - called whenever a scsi disk (previously recognized by
3356  *      sd_probe) is detached from the system. It is called (potentially
3357  *      multiple times) during sd module unload.
3358  *      @dev: pointer to device object
3359  *
3360  *      Note: this function is invoked from the scsi mid-level.
3361  *      This function potentially frees up a device name (e.g. /dev/sdc)
3362  *      that could be re-used by a subsequent sd_probe().
3363  *      This function is not called when the built-in sd driver is "exit-ed".
3364  **/
3365 static int sd_remove(struct device *dev)
3366 {
3367         struct scsi_disk *sdkp;
3368         dev_t devt;
3369
3370         sdkp = dev_get_drvdata(dev);
3371         devt = disk_devt(sdkp->disk);
3372         scsi_autopm_get_device(sdkp->device);
3373
3374         async_synchronize_full_domain(&scsi_sd_pm_domain);
3375         async_synchronize_full_domain(&scsi_sd_probe_domain);
3376         device_del(&sdkp->dev);
3377         del_gendisk(sdkp->disk);
3378         sd_shutdown(dev);
3379
3380         sd_zbc_remove(sdkp);
3381
3382         blk_register_region(devt, SD_MINORS, NULL,
3383                             sd_default_probe, NULL, NULL);
3384
3385         mutex_lock(&sd_ref_mutex);
3386         dev_set_drvdata(dev, NULL);
3387         put_device(&sdkp->dev);
3388         mutex_unlock(&sd_ref_mutex);
3389
3390         return 0;
3391 }
3392
3393 /**
3394  *      scsi_disk_release - Called to free the scsi_disk structure
3395  *      @dev: pointer to embedded class device
3396  *
3397  *      sd_ref_mutex must be held entering this routine.  Because it is
3398  *      called on last put, you should always use the scsi_disk_get()
3399  *      scsi_disk_put() helpers which manipulate the semaphore directly
3400  *      and never do a direct put_device.
3401  **/
3402 static void scsi_disk_release(struct device *dev)
3403 {
3404         struct scsi_disk *sdkp = to_scsi_disk(dev);
3405         struct gendisk *disk = sdkp->disk;
3406
3407         spin_lock(&sd_index_lock);
3408         ida_remove(&sd_index_ida, sdkp->index);
3409         spin_unlock(&sd_index_lock);
3410
3411         disk->private_data = NULL;
3412         put_disk(disk);
3413         put_device(&sdkp->device->sdev_gendev);
3414
3415         kfree(sdkp);
3416 }
3417
3418 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3419 {
3420         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3421         struct scsi_sense_hdr sshdr;
3422         struct scsi_device *sdp = sdkp->device;
3423         int res;
3424
3425         if (start)
3426                 cmd[4] |= 1;    /* START */
3427
3428         if (sdp->start_stop_pwr_cond)
3429                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3430
3431         if (!scsi_device_online(sdp))
3432                 return -ENODEV;
3433
3434         res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3435                         SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
3436         if (res) {
3437                 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3438                 if (driver_byte(res) & DRIVER_SENSE)
3439                         sd_print_sense_hdr(sdkp, &sshdr);
3440                 if (scsi_sense_valid(&sshdr) &&
3441                         /* 0x3a is medium not present */
3442                         sshdr.asc == 0x3a)
3443                         res = 0;
3444         }
3445
3446         /* SCSI error codes must not go to the generic layer */
3447         if (res)
3448                 return -EIO;
3449
3450         return 0;
3451 }
3452
3453 /*
3454  * Send a SYNCHRONIZE CACHE instruction down to the device through
3455  * the normal SCSI command structure.  Wait for the command to
3456  * complete.
3457  */
3458 static void sd_shutdown(struct device *dev)
3459 {
3460         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3461
3462         if (!sdkp)
3463                 return;         /* this can happen */
3464
3465         if (pm_runtime_suspended(dev))
3466                 return;
3467
3468         if (sdkp->WCE && sdkp->media_present) {
3469                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3470                 sd_sync_cache(sdkp, NULL);
3471         }
3472
3473         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3474                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3475                 sd_start_stop_device(sdkp, 0);
3476         }
3477 }
3478
3479 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3480 {
3481         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3482         struct scsi_sense_hdr sshdr;
3483         int ret = 0;
3484
3485         if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
3486                 return 0;
3487
3488         if (sdkp->WCE && sdkp->media_present) {
3489                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3490                 ret = sd_sync_cache(sdkp, &sshdr);
3491
3492                 if (ret) {
3493                         /* ignore OFFLINE device */
3494                         if (ret == -ENODEV)
3495                                 return 0;
3496
3497                         if (!scsi_sense_valid(&sshdr) ||
3498                             sshdr.sense_key != ILLEGAL_REQUEST)
3499                                 return ret;
3500
3501                         /*
3502                          * sshdr.sense_key == ILLEGAL_REQUEST means this drive
3503                          * doesn't support sync. There's not much to do and
3504                          * suspend shouldn't fail.
3505                          */
3506                          ret = 0;
3507                 }
3508         }
3509
3510         if (sdkp->device->manage_start_stop) {
3511                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3512                 /* an error is not worth aborting a system sleep */
3513                 ret = sd_start_stop_device(sdkp, 0);
3514                 if (ignore_stop_errors)
3515                         ret = 0;
3516         }
3517
3518         return ret;
3519 }
3520
3521 static int sd_suspend_system(struct device *dev)
3522 {
3523         return sd_suspend_common(dev, true);
3524 }
3525
3526 static int sd_suspend_runtime(struct device *dev)
3527 {
3528         return sd_suspend_common(dev, false);
3529 }
3530
3531 static int sd_resume(struct device *dev)
3532 {
3533         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3534
3535         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
3536                 return 0;
3537
3538         if (!sdkp->device->manage_start_stop)
3539                 return 0;
3540
3541         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3542         return sd_start_stop_device(sdkp, 1);
3543 }
3544
3545 /**
3546  *      init_sd - entry point for this driver (both when built in or when
3547  *      a module).
3548  *
3549  *      Note: this function registers this driver with the scsi mid-level.
3550  **/
3551 static int __init init_sd(void)
3552 {
3553         int majors = 0, i, err;
3554
3555         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3556
3557         for (i = 0; i < SD_MAJORS; i++) {
3558                 if (register_blkdev(sd_major(i), "sd") != 0)
3559                         continue;
3560                 majors++;
3561                 blk_register_region(sd_major(i), SD_MINORS, NULL,
3562                                     sd_default_probe, NULL, NULL);
3563         }
3564
3565         if (!majors)
3566                 return -ENODEV;
3567
3568         err = class_register(&sd_disk_class);
3569         if (err)
3570                 goto err_out;
3571
3572         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3573                                          0, 0, NULL);
3574         if (!sd_cdb_cache) {
3575                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3576                 err = -ENOMEM;
3577                 goto err_out_class;
3578         }
3579
3580         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3581         if (!sd_cdb_pool) {
3582                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3583                 err = -ENOMEM;
3584                 goto err_out_cache;
3585         }
3586
3587         err = scsi_register_driver(&sd_template.gendrv);
3588         if (err)
3589                 goto err_out_driver;
3590
3591         return 0;
3592
3593 err_out_driver:
3594         mempool_destroy(sd_cdb_pool);
3595
3596 err_out_cache:
3597         kmem_cache_destroy(sd_cdb_cache);
3598
3599 err_out_class:
3600         class_unregister(&sd_disk_class);
3601 err_out:
3602         for (i = 0; i < SD_MAJORS; i++)
3603                 unregister_blkdev(sd_major(i), "sd");
3604         return err;
3605 }
3606
3607 /**
3608  *      exit_sd - exit point for this driver (when it is a module).
3609  *
3610  *      Note: this function unregisters this driver from the scsi mid-level.
3611  **/
3612 static void __exit exit_sd(void)
3613 {
3614         int i;
3615
3616         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3617
3618         scsi_unregister_driver(&sd_template.gendrv);
3619         mempool_destroy(sd_cdb_pool);
3620         kmem_cache_destroy(sd_cdb_cache);
3621
3622         class_unregister(&sd_disk_class);
3623
3624         for (i = 0; i < SD_MAJORS; i++) {
3625                 blk_unregister_region(sd_major(i), SD_MINORS);
3626                 unregister_blkdev(sd_major(i), "sd");
3627         }
3628 }
3629
3630 module_init(init_sd);
3631 module_exit(exit_sd);
3632
3633 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3634                                struct scsi_sense_hdr *sshdr)
3635 {
3636         scsi_print_sense_hdr(sdkp->device,
3637                              sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3638 }
3639
3640 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3641                             int result)
3642 {
3643         const char *hb_string = scsi_hostbyte_string(result);
3644         const char *db_string = scsi_driverbyte_string(result);
3645
3646         if (hb_string || db_string)
3647                 sd_printk(KERN_INFO, sdkp,
3648                           "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3649                           hb_string ? hb_string : "invalid",
3650                           db_string ? db_string : "invalid");
3651         else
3652                 sd_printk(KERN_INFO, sdkp,
3653                           "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3654                           msg, host_byte(result), driver_byte(result));
3655 }
3656