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/blk-pm.h>
  49 #include <linux/delay.h>
  50 #include <linux/mutex.h>
  51 #include <linux/string_helpers.h>
  52 #include <linux/async.h>
  53 #include <linux/slab.h>
  54 #include <linux/sed-opal.h>
  55 #include <linux/pm_runtime.h>
  56 #include <linux/pr.h>
  57 #include <linux/t10-pi.h>
  58 #include <linux/uaccess.h>
  59 #include <asm/unaligned.h>
  60
  61 #include <scsi/scsi.h>
  62 #include <scsi/scsi_cmnd.h>
  63 #include <scsi/scsi_dbg.h>
  64 #include <scsi/scsi_device.h>
  65 #include <scsi/scsi_driver.h>
  66 #include <scsi/scsi_eh.h>
  67 #include <scsi/scsi_host.h>
  68 #include <scsi/scsi_ioctl.h>
  69 #include <scsi/scsicam.h>
  70
  71 #include "sd.h"
  72 #include "scsi_priv.h"
  73 #include "scsi_logging.h"
  74
  75 MODULE_AUTHOR("Eric Youngdale");
  76 MODULE_DESCRIPTION("SCSI disk (sd) driver");
  77 MODULE_LICENSE("GPL");
  78
  79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  94 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  95 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  96 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  97 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  98 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
  99
 100 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
 101 #define SD_MINORS       16
 102 #else
 103 #define SD_MINORS       0
 104 #endif
 105
 106 static void sd_config_discard(struct scsi_disk *, unsigned int);
 107 static void sd_config_write_same(struct scsi_disk *);
 108 static int  sd_revalidate_disk(struct gendisk *);
 109 static void sd_unlock_native_capacity(struct gendisk *disk);
 110 static int  sd_probe(struct device *);
 111 static int  sd_remove(struct device *);
 112 static void sd_shutdown(struct device *);
 113 static int sd_suspend_system(struct device *);
 114 static int sd_suspend_runtime(struct device *);
 115 static int sd_resume(struct device *);
 116 static void sd_rescan(struct device *);
 117 static int sd_init_command(struct scsi_cmnd *SCpnt);
 118 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 119 static int sd_done(struct scsi_cmnd *);
 120 static void sd_eh_reset(struct scsi_cmnd *);
 121 static int sd_eh_action(struct scsi_cmnd *, int);
 122 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 123 static void scsi_disk_release(struct device *cdev);
 124 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 125 static void sd_print_result(const struct scsi_disk *, const char *, int);
 126
 127 static DEFINE_IDA(sd_index_ida);
 128
 129 /* This semaphore is used to mediate the 0->1 reference get in the
 130  * face of object destruction (i.e. we can't allow a get on an
 131  * object after last put) */
 132 static DEFINE_MUTEX(sd_ref_mutex);
 133
 134 static struct kmem_cache *sd_cdb_cache;
 135 static mempool_t *sd_cdb_pool;
 136
 137 static const char *sd_cache_types[] = {
 138         "write through", "none", "write back",
 139         "write back, no read (daft)"
 140 };
 141
 142 static void sd_set_flush_flag(struct scsi_disk *sdkp)
 143 {
 144         bool wc = false, fua = false;
 145
 146         if (sdkp->WCE) {
 147                 wc = true;
 148                 if (sdkp->DPOFUA)
 149                         fua = true;
 150         }
 151
 152         blk_queue_write_cache(sdkp->disk->queue, wc, fua);
 153 }
 154
 155 static ssize_t
 156 cache_type_store(struct device *dev, struct device_attribute *attr,
 157                  const char *buf, size_t count)
 158 {
 159         int ct, rcd, wce, sp;
 160         struct scsi_disk *sdkp = to_scsi_disk(dev);
 161         struct scsi_device *sdp = sdkp->device;
 162         char buffer[64];
 163         char *buffer_data;
 164         struct scsi_mode_data data;
 165         struct scsi_sense_hdr sshdr;
 166         static const char temp[] = "temporary ";
 167         int len;
 168
 169         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 170                 /* no cache control on RBC devices; theoretically they
 171                  * can do it, but there's probably so many exceptions
 172                  * it's not worth the risk */
 173                 return -EINVAL;
 174
 175         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 176                 buf += sizeof(temp) - 1;
 177                 sdkp->cache_override = 1;
 178         } else {
 179                 sdkp->cache_override = 0;
 180         }
 181
 182         ct = sysfs_match_string(sd_cache_types, buf);
 183         if (ct < 0)
 184                 return -EINVAL;
 185
 186         rcd = ct & 0x01 ? 1 : 0;
 187         wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 188
 189         if (sdkp->cache_override) {
 190                 sdkp->WCE = wce;
 191                 sdkp->RCD = rcd;
 192                 sd_set_flush_flag(sdkp);
 193                 return count;
 194         }
 195
 196         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 197                             SD_MAX_RETRIES, &data, NULL))
 198                 return -EINVAL;
 199         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 200                   data.block_descriptor_length);
 201         buffer_data = buffer + data.header_length +
 202                 data.block_descriptor_length;
 203         buffer_data[2] &= ~0x05;
 204         buffer_data[2] |= wce << 2 | rcd;
 205         sp = buffer_data[0] & 0x80 ? 1 : 0;
 206         buffer_data[0] &= ~0x80;
 207
 208         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 209                              SD_MAX_RETRIES, &data, &sshdr)) {
 210                 if (scsi_sense_valid(&sshdr))
 211                         sd_print_sense_hdr(sdkp, &sshdr);
 212                 return -EINVAL;
 213         }
 214         revalidate_disk(sdkp->disk);
 215         return count;
 216 }
 217
 218 static ssize_t
 219 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
 220                        char *buf)
 221 {
 222         struct scsi_disk *sdkp = to_scsi_disk(dev);
 223         struct scsi_device *sdp = sdkp->device;
 224
 225         return sprintf(buf, "%u\n", sdp->manage_start_stop);
 226 }
 227
 228 static ssize_t
 229 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
 230                         const char *buf, size_t count)
 231 {
 232         struct scsi_disk *sdkp = to_scsi_disk(dev);
 233         struct scsi_device *sdp = sdkp->device;
 234         bool v;
 235
 236         if (!capable(CAP_SYS_ADMIN))
 237                 return -EACCES;
 238
 239         if (kstrtobool(buf, &v))
 240                 return -EINVAL;
 241
 242         sdp->manage_start_stop = v;
 243
 244         return count;
 245 }
 246 static DEVICE_ATTR_RW(manage_start_stop);
 247
 248 static ssize_t
 249 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 250 {
 251         struct scsi_disk *sdkp = to_scsi_disk(dev);
 252
 253         return sprintf(buf, "%u\n", sdkp->device->allow_restart);
 254 }
 255
 256 static ssize_t
 257 allow_restart_store(struct device *dev, struct device_attribute *attr,
 258                     const char *buf, size_t count)
 259 {
 260         bool v;
 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         if (kstrtobool(buf, &v))
 271                 return -EINVAL;
 272
 273         sdp->allow_restart = v;
 274
 275         return count;
 276 }
 277 static DEVICE_ATTR_RW(allow_restart);
 278
 279 static ssize_t
 280 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 281 {
 282         struct scsi_disk *sdkp = to_scsi_disk(dev);
 283         int ct = sdkp->RCD + 2*sdkp->WCE;
 284
 285         return sprintf(buf, "%s\n", sd_cache_types[ct]);
 286 }
 287 static DEVICE_ATTR_RW(cache_type);
 288
 289 static ssize_t
 290 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 291 {
 292         struct scsi_disk *sdkp = to_scsi_disk(dev);
 293
 294         return sprintf(buf, "%u\n", sdkp->DPOFUA);
 295 }
 296 static DEVICE_ATTR_RO(FUA);
 297
 298 static ssize_t
 299 protection_type_show(struct device *dev, struct device_attribute *attr,
 300                      char *buf)
 301 {
 302         struct scsi_disk *sdkp = to_scsi_disk(dev);
 303
 304         return sprintf(buf, "%u\n", sdkp->protection_type);
 305 }
 306
 307 static ssize_t
 308 protection_type_store(struct device *dev, struct device_attribute *attr,
 309                       const char *buf, size_t count)
 310 {
 311         struct scsi_disk *sdkp = to_scsi_disk(dev);
 312         unsigned int val;
 313         int err;
 314
 315         if (!capable(CAP_SYS_ADMIN))
 316                 return -EACCES;
 317
 318         err = kstrtouint(buf, 10, &val);
 319
 320         if (err)
 321                 return err;
 322
 323         if (val <= T10_PI_TYPE3_PROTECTION)
 324                 sdkp->protection_type = val;
 325
 326         return count;
 327 }
 328 static DEVICE_ATTR_RW(protection_type);
 329
 330 static ssize_t
 331 protection_mode_show(struct device *dev, struct device_attribute *attr,
 332                      char *buf)
 333 {
 334         struct scsi_disk *sdkp = to_scsi_disk(dev);
 335         struct scsi_device *sdp = sdkp->device;
 336         unsigned int dif, dix;
 337
 338         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 339         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 340
 341         if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
 342                 dif = 0;
 343                 dix = 1;
 344         }
 345
 346         if (!dif && !dix)
 347                 return sprintf(buf, "none\n");
 348
 349         return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
 350 }
 351 static DEVICE_ATTR_RO(protection_mode);
 352
 353 static ssize_t
 354 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 355 {
 356         struct scsi_disk *sdkp = to_scsi_disk(dev);
 357
 358         return sprintf(buf, "%u\n", sdkp->ATO);
 359 }
 360 static DEVICE_ATTR_RO(app_tag_own);
 361
 362 static ssize_t
 363 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
 364                        char *buf)
 365 {
 366         struct scsi_disk *sdkp = to_scsi_disk(dev);
 367
 368         return sprintf(buf, "%u\n", sdkp->lbpme);
 369 }
 370 static DEVICE_ATTR_RO(thin_provisioning);
 371
 372 /* sysfs_match_string() requires dense arrays */
 373 static const char *lbp_mode[] = {
 374         [SD_LBP_FULL]           = "full",
 375         [SD_LBP_UNMAP]          = "unmap",
 376         [SD_LBP_WS16]           = "writesame_16",
 377         [SD_LBP_WS10]           = "writesame_10",
 378         [SD_LBP_ZERO]           = "writesame_zero",
 379         [SD_LBP_DISABLE]        = "disabled",
 380 };
 381
 382 static ssize_t
 383 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
 384                        char *buf)
 385 {
 386         struct scsi_disk *sdkp = to_scsi_disk(dev);
 387
 388         return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 389 }
 390
 391 static ssize_t
 392 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
 393                         const char *buf, size_t count)
 394 {
 395         struct scsi_disk *sdkp = to_scsi_disk(dev);
 396         struct scsi_device *sdp = sdkp->device;
 397         int mode;
 398
 399         if (!capable(CAP_SYS_ADMIN))
 400                 return -EACCES;
 401
 402         if (sd_is_zoned(sdkp)) {
 403                 sd_config_discard(sdkp, SD_LBP_DISABLE);
 404                 return count;
 405         }
 406
 407         if (sdp->type != TYPE_DISK)
 408                 return -EINVAL;
 409
 410         mode = sysfs_match_string(lbp_mode, buf);
 411         if (mode < 0)
 412                 return -EINVAL;
 413
 414         sd_config_discard(sdkp, mode);
 415
 416         return count;
 417 }
 418 static DEVICE_ATTR_RW(provisioning_mode);
 419
 420 /* sysfs_match_string() requires dense arrays */
 421 static const char *zeroing_mode[] = {
 422         [SD_ZERO_WRITE]         = "write",
 423         [SD_ZERO_WS]            = "writesame",
 424         [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
 425         [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
 426 };
 427
 428 static ssize_t
 429 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
 430                   char *buf)
 431 {
 432         struct scsi_disk *sdkp = to_scsi_disk(dev);
 433
 434         return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
 435 }
 436
 437 static ssize_t
 438 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
 439                    const char *buf, size_t count)
 440 {
 441         struct scsi_disk *sdkp = to_scsi_disk(dev);
 442         int mode;
 443
 444         if (!capable(CAP_SYS_ADMIN))
 445                 return -EACCES;
 446
 447         mode = sysfs_match_string(zeroing_mode, buf);
 448         if (mode < 0)
 449                 return -EINVAL;
 450
 451         sdkp->zeroing_mode = mode;
 452
 453         return count;
 454 }
 455 static DEVICE_ATTR_RW(zeroing_mode);
 456
 457 static ssize_t
 458 max_medium_access_timeouts_show(struct device *dev,
 459                                 struct device_attribute *attr, char *buf)
 460 {
 461         struct scsi_disk *sdkp = to_scsi_disk(dev);
 462
 463         return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
 464 }
 465
 466 static ssize_t
 467 max_medium_access_timeouts_store(struct device *dev,
 468                                  struct device_attribute *attr, const char *buf,
 469                                  size_t count)
 470 {
 471         struct scsi_disk *sdkp = to_scsi_disk(dev);
 472         int err;
 473
 474         if (!capable(CAP_SYS_ADMIN))
 475                 return -EACCES;
 476
 477         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 478
 479         return err ? err : count;
 480 }
 481 static DEVICE_ATTR_RW(max_medium_access_timeouts);
 482
 483 static ssize_t
 484 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
 485                            char *buf)
 486 {
 487         struct scsi_disk *sdkp = to_scsi_disk(dev);
 488
 489         return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
 490 }
 491
 492 static ssize_t
 493 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
 494                             const char *buf, size_t count)
 495 {
 496         struct scsi_disk *sdkp = to_scsi_disk(dev);
 497         struct scsi_device *sdp = sdkp->device;
 498         unsigned long max;
 499         int err;
 500
 501         if (!capable(CAP_SYS_ADMIN))
 502                 return -EACCES;
 503
 504         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 505                 return -EINVAL;
 506
 507         err = kstrtoul(buf, 10, &max);
 508
 509         if (err)
 510                 return err;
 511
 512         if (max == 0)
 513                 sdp->no_write_same = 1;
 514         else if (max <= SD_MAX_WS16_BLOCKS) {
 515                 sdp->no_write_same = 0;
 516                 sdkp->max_ws_blocks = max;
 517         }
 518
 519         sd_config_write_same(sdkp);
 520
 521         return count;
 522 }
 523 static DEVICE_ATTR_RW(max_write_same_blocks);
 524
 525 static struct attribute *sd_disk_attrs[] = {
 526         &dev_attr_cache_type.attr,
 527         &dev_attr_FUA.attr,
 528         &dev_attr_allow_restart.attr,
 529         &dev_attr_manage_start_stop.attr,
 530         &dev_attr_protection_type.attr,
 531         &dev_attr_protection_mode.attr,
 532         &dev_attr_app_tag_own.attr,
 533         &dev_attr_thin_provisioning.attr,
 534         &dev_attr_provisioning_mode.attr,
 535         &dev_attr_zeroing_mode.attr,
 536         &dev_attr_max_write_same_blocks.attr,
 537         &dev_attr_max_medium_access_timeouts.attr,
 538         NULL,
 539 };
 540 ATTRIBUTE_GROUPS(sd_disk);
 541
 542 static struct class sd_disk_class = {
 543         .name           = "scsi_disk",
 544         .owner          = THIS_MODULE,
 545         .dev_release    = scsi_disk_release,
 546         .dev_groups     = sd_disk_groups,
 547 };
 548
 549 static const struct dev_pm_ops sd_pm_ops = {
 550         .suspend                = sd_suspend_system,
 551         .resume                 = sd_resume,
 552         .poweroff               = sd_suspend_system,
 553         .restore                = sd_resume,
 554         .runtime_suspend        = sd_suspend_runtime,
 555         .runtime_resume         = sd_resume,
 556 };
 557
 558 static struct scsi_driver sd_template = {
 559         .gendrv = {
 560                 .name           = "sd",
 561                 .owner          = THIS_MODULE,
 562                 .probe          = sd_probe,
 563                 .remove         = sd_remove,
 564                 .shutdown       = sd_shutdown,
 565                 .pm             = &sd_pm_ops,
 566         },
 567         .rescan                 = sd_rescan,
 568         .init_command           = sd_init_command,
 569         .uninit_command         = sd_uninit_command,
 570         .done                   = sd_done,
 571         .eh_action              = sd_eh_action,
 572         .eh_reset               = sd_eh_reset,
 573 };
 574
 575 /*
 576  * Dummy kobj_map->probe function.
 577  * The default ->probe function will call modprobe, which is
 578  * pointless as this module is already loaded.
 579  */
 580 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
 581 {
 582         return NULL;
 583 }
 584
 585 /*
 586  * Device no to disk mapping:
 587  *
 588  *       major         disc2     disc  p1
 589  *   |............|.............|....|....| <- dev_t
 590  *    31        20 19          8 7  4 3  0
 591  *
 592  * Inside a major, we have 16k disks, however mapped non-
 593  * contiguously. The first 16 disks are for major0, the next
 594  * ones with major1, ... Disk 256 is for major0 again, disk 272
 595  * for major1, ...
 596  * As we stay compatible with our numbering scheme, we can reuse
 597  * the well-know SCSI majors 8, 65--71, 136--143.
 598  */
 599 static int sd_major(int major_idx)
 600 {
 601         switch (major_idx) {
 602         case 0:
 603                 return SCSI_DISK0_MAJOR;
 604         case 1 ... 7:
 605                 return SCSI_DISK1_MAJOR + major_idx - 1;
 606         case 8 ... 15:
 607                 return SCSI_DISK8_MAJOR + major_idx - 8;
 608         default:
 609                 BUG();
 610                 return 0;       /* shut up gcc */
 611         }
 612 }
 613
 614 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 615 {
 616         struct scsi_disk *sdkp = NULL;
 617
 618         mutex_lock(&sd_ref_mutex);
 619
 620         if (disk->private_data) {
 621                 sdkp = scsi_disk(disk);
 622                 if (scsi_device_get(sdkp->device) == 0)
 623                         get_device(&sdkp->dev);
 624                 else
 625                         sdkp = NULL;
 626         }
 627         mutex_unlock(&sd_ref_mutex);
 628         return sdkp;
 629 }
 630
 631 static void scsi_disk_put(struct scsi_disk *sdkp)
 632 {
 633         struct scsi_device *sdev = sdkp->device;
 634
 635         mutex_lock(&sd_ref_mutex);
 636         put_device(&sdkp->dev);
 637         scsi_device_put(sdev);
 638         mutex_unlock(&sd_ref_mutex);
 639 }
 640
 641 #ifdef CONFIG_BLK_SED_OPAL
 642 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
 643                 size_t len, bool send)
 644 {
 645         struct scsi_device *sdev = data;
 646         u8 cdb[12] = { 0, };
 647         int ret;
 648
 649         cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
 650         cdb[1] = secp;
 651         put_unaligned_be16(spsp, &cdb[2]);
 652         put_unaligned_be32(len, &cdb[6]);
 653
 654         ret = scsi_execute_req(sdev, cdb,
 655                         send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
 656                         buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
 657         return ret <= 0 ? ret : -EIO;
 658 }
 659 #endif /* CONFIG_BLK_SED_OPAL */
 660
 661 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
 662                                            unsigned int dix, unsigned int dif)
 663 {
 664         struct bio *bio = scmd->request->bio;
 665         unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
 666         unsigned int protect = 0;
 667
 668         if (dix) {                              /* DIX Type 0, 1, 2, 3 */
 669                 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
 670                         scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
 671
 672                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 673                         scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
 674         }
 675
 676         if (dif != T10_PI_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
 677                 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
 678
 679                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 680                         scmd->prot_flags |= SCSI_PROT_REF_CHECK;
 681         }
 682
 683         if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
 684                 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
 685
 686                 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
 687                         protect = 3 << 5;       /* Disable target PI checking */
 688                 else
 689                         protect = 1 << 5;       /* Enable target PI checking */
 690         }
 691
 692         scsi_set_prot_op(scmd, prot_op);
 693         scsi_set_prot_type(scmd, dif);
 694         scmd->prot_flags &= sd_prot_flag_mask(prot_op);
 695
 696         return protect;
 697 }
 698
 699 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 700 {
 701         struct request_queue *q = sdkp->disk->queue;
 702         unsigned int logical_block_size = sdkp->device->sector_size;
 703         unsigned int max_blocks = 0;
 704
 705         q->limits.discard_alignment =
 706                 sdkp->unmap_alignment * logical_block_size;
 707         q->limits.discard_granularity =
 708                 max(sdkp->physical_block_size,
 709                     sdkp->unmap_granularity * logical_block_size);
 710         sdkp->provisioning_mode = mode;
 711
 712         switch (mode) {
 713
 714         case SD_LBP_FULL:
 715         case SD_LBP_DISABLE:
 716                 blk_queue_max_discard_sectors(q, 0);
 717                 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
 718                 return;
 719
 720         case SD_LBP_UNMAP:
 721                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 722                                           (u32)SD_MAX_WS16_BLOCKS);
 723                 break;
 724
 725         case SD_LBP_WS16:
 726                 if (sdkp->device->unmap_limit_for_ws)
 727                         max_blocks = sdkp->max_unmap_blocks;
 728                 else
 729                         max_blocks = sdkp->max_ws_blocks;
 730
 731                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
 732                 break;
 733
 734         case SD_LBP_WS10:
 735                 if (sdkp->device->unmap_limit_for_ws)
 736                         max_blocks = sdkp->max_unmap_blocks;
 737                 else
 738                         max_blocks = sdkp->max_ws_blocks;
 739
 740                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
 741                 break;
 742
 743         case SD_LBP_ZERO:
 744                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 745                                           (u32)SD_MAX_WS10_BLOCKS);
 746                 break;
 747         }
 748
 749         blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
 750         blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 751 }
 752
 753 static int sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
 754 {
 755         struct scsi_device *sdp = cmd->device;
 756         struct request *rq = cmd->request;
 757         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 758         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 759         unsigned int data_len = 24;
 760         char *buf;
 761
 762         rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 763         if (!rq->special_vec.bv_page)
 764                 return BLKPREP_DEFER;
 765         rq->special_vec.bv_offset = 0;
 766         rq->special_vec.bv_len = data_len;
 767         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 768
 769         cmd->cmd_len = 10;
 770         cmd->cmnd[0] = UNMAP;
 771         cmd->cmnd[8] = 24;
 772
 773         buf = page_address(rq->special_vec.bv_page);
 774         put_unaligned_be16(6 + 16, &buf[0]);
 775         put_unaligned_be16(16, &buf[2]);
 776         put_unaligned_be64(sector, &buf[8]);
 777         put_unaligned_be32(nr_sectors, &buf[16]);
 778
 779         cmd->allowed = SD_MAX_RETRIES;
 780         cmd->transfersize = data_len;
 781         rq->timeout = SD_TIMEOUT;
 782         scsi_req(rq)->resid_len = data_len;
 783
 784         return scsi_init_io(cmd);
 785 }
 786
 787 static int sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd, bool unmap)
 788 {
 789         struct scsi_device *sdp = cmd->device;
 790         struct request *rq = cmd->request;
 791         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 792         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 793         u32 data_len = sdp->sector_size;
 794
 795         rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 796         if (!rq->special_vec.bv_page)
 797                 return BLKPREP_DEFER;
 798         rq->special_vec.bv_offset = 0;
 799         rq->special_vec.bv_len = data_len;
 800         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 801
 802         cmd->cmd_len = 16;
 803         cmd->cmnd[0] = WRITE_SAME_16;
 804         if (unmap)
 805                 cmd->cmnd[1] = 0x8; /* UNMAP */
 806         put_unaligned_be64(sector, &cmd->cmnd[2]);
 807         put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
 808
 809         cmd->allowed = SD_MAX_RETRIES;
 810         cmd->transfersize = data_len;
 811         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 812         scsi_req(rq)->resid_len = data_len;
 813
 814         return scsi_init_io(cmd);
 815 }
 816
 817 static int sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, bool unmap)
 818 {
 819         struct scsi_device *sdp = cmd->device;
 820         struct request *rq = cmd->request;
 821         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 822         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 823         u32 data_len = sdp->sector_size;
 824
 825         rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 826         if (!rq->special_vec.bv_page)
 827                 return BLKPREP_DEFER;
 828         rq->special_vec.bv_offset = 0;
 829         rq->special_vec.bv_len = data_len;
 830         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 831
 832         cmd->cmd_len = 10;
 833         cmd->cmnd[0] = WRITE_SAME;
 834         if (unmap)
 835                 cmd->cmnd[1] = 0x8; /* UNMAP */
 836         put_unaligned_be32(sector, &cmd->cmnd[2]);
 837         put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
 838
 839         cmd->allowed = SD_MAX_RETRIES;
 840         cmd->transfersize = data_len;
 841         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 842         scsi_req(rq)->resid_len = data_len;
 843
 844         return scsi_init_io(cmd);
 845 }
 846
 847 static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
 848 {
 849         struct request *rq = cmd->request;
 850         struct scsi_device *sdp = cmd->device;
 851         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 852         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 853         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 854
 855         if (!(rq->cmd_flags & REQ_NOUNMAP)) {
 856                 switch (sdkp->zeroing_mode) {
 857                 case SD_ZERO_WS16_UNMAP:
 858                         return sd_setup_write_same16_cmnd(cmd, true);
 859                 case SD_ZERO_WS10_UNMAP:
 860                         return sd_setup_write_same10_cmnd(cmd, true);
 861                 }
 862         }
 863
 864         if (sdp->no_write_same)
 865                 return BLKPREP_INVALID;
 866
 867         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
 868                 return sd_setup_write_same16_cmnd(cmd, false);
 869
 870         return sd_setup_write_same10_cmnd(cmd, false);
 871 }
 872
 873 static void sd_config_write_same(struct scsi_disk *sdkp)
 874 {
 875         struct request_queue *q = sdkp->disk->queue;
 876         unsigned int logical_block_size = sdkp->device->sector_size;
 877
 878         if (sdkp->device->no_write_same) {
 879                 sdkp->max_ws_blocks = 0;
 880                 goto out;
 881         }
 882
 883         /* Some devices can not handle block counts above 0xffff despite
 884          * supporting WRITE SAME(16). Consequently we default to 64k
 885          * blocks per I/O unless the device explicitly advertises a
 886          * bigger limit.
 887          */
 888         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 889                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 890                                                    (u32)SD_MAX_WS16_BLOCKS);
 891         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 892                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 893                                                    (u32)SD_MAX_WS10_BLOCKS);
 894         else {
 895                 sdkp->device->no_write_same = 1;
 896                 sdkp->max_ws_blocks = 0;
 897         }
 898
 899         if (sdkp->lbprz && sdkp->lbpws)
 900                 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
 901         else if (sdkp->lbprz && sdkp->lbpws10)
 902                 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
 903         else if (sdkp->max_ws_blocks)
 904                 sdkp->zeroing_mode = SD_ZERO_WS;
 905         else
 906                 sdkp->zeroing_mode = SD_ZERO_WRITE;
 907
 908         if (sdkp->max_ws_blocks &&
 909             sdkp->physical_block_size > logical_block_size) {
 910                 /*
 911                  * Reporting a maximum number of blocks that is not aligned
 912                  * on the device physical size would cause a large write same
 913                  * request to be split into physically unaligned chunks by
 914                  * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same()
 915                  * even if the caller of these functions took care to align the
 916                  * large request. So make sure the maximum reported is aligned
 917                  * to the device physical block size. This is only an optional
 918                  * optimization for regular disks, but this is mandatory to
 919                  * avoid failure of large write same requests directed at
 920                  * sequential write required zones of host-managed ZBC disks.
 921                  */
 922                 sdkp->max_ws_blocks =
 923                         round_down(sdkp->max_ws_blocks,
 924                                    bytes_to_logical(sdkp->device,
 925                                                     sdkp->physical_block_size));
 926         }
 927
 928 out:
 929         blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
 930                                          (logical_block_size >> 9));
 931         blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
 932                                          (logical_block_size >> 9));
 933 }
 934
 935 /**
 936  * sd_setup_write_same_cmnd - write the same data to multiple blocks
 937  * @cmd: command to prepare
 938  *
 939  * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
 940  * the preference indicated by the target device.
 941  **/
 942 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
 943 {
 944         struct request *rq = cmd->request;
 945         struct scsi_device *sdp = cmd->device;
 946         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 947         struct bio *bio = rq->bio;
 948         sector_t sector = blk_rq_pos(rq);
 949         unsigned int nr_sectors = blk_rq_sectors(rq);
 950         unsigned int nr_bytes = blk_rq_bytes(rq);
 951         int ret;
 952
 953         if (sdkp->device->no_write_same)
 954                 return BLKPREP_INVALID;
 955
 956         BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
 957
 958         sector >>= ilog2(sdp->sector_size) - 9;
 959         nr_sectors >>= ilog2(sdp->sector_size) - 9;
 960
 961         rq->timeout = SD_WRITE_SAME_TIMEOUT;
 962
 963         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
 964                 cmd->cmd_len = 16;
 965                 cmd->cmnd[0] = WRITE_SAME_16;
 966                 put_unaligned_be64(sector, &cmd->cmnd[2]);
 967                 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
 968         } else {
 969                 cmd->cmd_len = 10;
 970                 cmd->cmnd[0] = WRITE_SAME;
 971                 put_unaligned_be32(sector, &cmd->cmnd[2]);
 972                 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
 973         }
 974
 975         cmd->transfersize = sdp->sector_size;
 976         cmd->allowed = SD_MAX_RETRIES;
 977
 978         /*
 979          * For WRITE SAME the data transferred via the DATA OUT buffer is
 980          * different from the amount of data actually written to the target.
 981          *
 982          * We set up __data_len to the amount of data transferred via the
 983          * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
 984          * to transfer a single sector of data first, but then reset it to
 985          * the amount of data to be written right after so that the I/O path
 986          * knows how much to actually write.
 987          */
 988         rq->__data_len = sdp->sector_size;
 989         ret = scsi_init_io(cmd);
 990         rq->__data_len = nr_bytes;
 991
 992         return ret;
 993 }
 994
 995 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
 996 {
 997         struct request *rq = cmd->request;
 998
 999         /* flush requests don't perform I/O, zero the S/G table */
1000         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1001
1002         cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1003         cmd->cmd_len = 10;
1004         cmd->transfersize = 0;
1005         cmd->allowed = SD_MAX_RETRIES;
1006
1007         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1008         return BLKPREP_OK;
1009 }
1010
1011 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
1012 {
1013         struct request *rq = SCpnt->request;
1014         struct scsi_device *sdp = SCpnt->device;
1015         struct gendisk *disk = rq->rq_disk;
1016         struct scsi_disk *sdkp = scsi_disk(disk);
1017         sector_t block = blk_rq_pos(rq);
1018         sector_t threshold;
1019         unsigned int this_count = blk_rq_sectors(rq);
1020         unsigned int dif, dix;
1021         int ret;
1022         unsigned char protect;
1023
1024         ret = scsi_init_io(SCpnt);
1025         if (ret != BLKPREP_OK)
1026                 return ret;
1027         WARN_ON_ONCE(SCpnt != rq->special);
1028
1029         /* from here on until we're complete, any goto out
1030          * is used for a killable error condition */
1031         ret = BLKPREP_KILL;
1032
1033         SCSI_LOG_HLQUEUE(1,
1034                 scmd_printk(KERN_INFO, SCpnt,
1035                         "%s: block=%llu, count=%d\n",
1036                         __func__, (unsigned long long)block, this_count));
1037
1038         if (!sdp || !scsi_device_online(sdp) ||
1039             block + blk_rq_sectors(rq) > get_capacity(disk)) {
1040                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1041                                                 "Finishing %u sectors\n",
1042                                                 blk_rq_sectors(rq)));
1043                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1044                                                 "Retry with 0x%p\n", SCpnt));
1045                 goto out;
1046         }
1047
1048         if (sdp->changed) {
1049                 /*
1050                  * quietly refuse to do anything to a changed disc until
1051                  * the changed bit has been reset
1052                  */
1053                 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
1054                 goto out;
1055         }
1056
1057         /*
1058          * Some SD card readers can't handle multi-sector accesses which touch
1059          * the last one or two hardware sectors.  Split accesses as needed.
1060          */
1061         threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
1062                 (sdp->sector_size / 512);
1063
1064         if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
1065                 if (block < threshold) {
1066                         /* Access up to the threshold but not beyond */
1067                         this_count = threshold - block;
1068                 } else {
1069                         /* Access only a single hardware sector */
1070                         this_count = sdp->sector_size / 512;
1071                 }
1072         }
1073
1074         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
1075                                         (unsigned long long)block));
1076
1077         /*
1078          * If we have a 1K hardware sectorsize, prevent access to single
1079          * 512 byte sectors.  In theory we could handle this - in fact
1080          * the scsi cdrom driver must be able to handle this because
1081          * we typically use 1K blocksizes, and cdroms typically have
1082          * 2K hardware sectorsizes.  Of course, things are simpler
1083          * with the cdrom, since it is read-only.  For performance
1084          * reasons, the filesystems should be able to handle this
1085          * and not force the scsi disk driver to use bounce buffers
1086          * for this.
1087          */
1088         if (sdp->sector_size == 1024) {
1089                 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
1090                         scmd_printk(KERN_ERR, SCpnt,
1091                                     "Bad block number requested\n");
1092                         goto out;
1093                 } else {
1094                         block = block >> 1;
1095                         this_count = this_count >> 1;
1096                 }
1097         }
1098         if (sdp->sector_size == 2048) {
1099                 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
1100                         scmd_printk(KERN_ERR, SCpnt,
1101                                     "Bad block number requested\n");
1102                         goto out;
1103                 } else {
1104                         block = block >> 2;
1105                         this_count = this_count >> 2;
1106                 }
1107         }
1108         if (sdp->sector_size == 4096) {
1109                 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
1110                         scmd_printk(KERN_ERR, SCpnt,
1111                                     "Bad block number requested\n");
1112                         goto out;
1113                 } else {
1114                         block = block >> 3;
1115                         this_count = this_count >> 3;
1116                 }
1117         }
1118         if (rq_data_dir(rq) == WRITE) {
1119                 SCpnt->cmnd[0] = WRITE_6;
1120
1121                 if (blk_integrity_rq(rq))
1122                         t10_pi_prepare(SCpnt->request, sdkp->protection_type);
1123
1124         } else if (rq_data_dir(rq) == READ) {
1125                 SCpnt->cmnd[0] = READ_6;
1126         } else {
1127                 scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq));
1128                 goto out;
1129         }
1130
1131         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1132                                         "%s %d/%u 512 byte blocks.\n",
1133                                         (rq_data_dir(rq) == WRITE) ?
1134                                         "writing" : "reading", this_count,
1135                                         blk_rq_sectors(rq)));
1136
1137         dix = scsi_prot_sg_count(SCpnt);
1138         dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1139
1140         if (dif || dix)
1141                 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1142         else
1143                 protect = 0;
1144
1145         if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1146                 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1147
1148                 if (unlikely(SCpnt->cmnd == NULL)) {
1149                         ret = BLKPREP_DEFER;
1150                         goto out;
1151                 }
1152
1153                 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1154                 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1155                 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1156                 SCpnt->cmnd[7] = 0x18;
1157                 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1158                 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1159
1160                 /* LBA */
1161                 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1162                 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1163                 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1164                 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1165                 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1166                 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1167                 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1168                 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1169
1170                 /* Expected Indirect LBA */
1171                 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1172                 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1173                 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1174                 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1175
1176                 /* Transfer length */
1177                 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1178                 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1179                 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1180                 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1181         } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1182                 SCpnt->cmnd[0] += READ_16 - READ_6;
1183                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1184                 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1185                 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1186                 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1187                 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1188                 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1189                 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1190                 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1191                 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1192                 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1193                 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1194                 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1195                 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1196                 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1197         } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1198                    scsi_device_protection(SCpnt->device) ||
1199                    SCpnt->device->use_10_for_rw) {
1200                 SCpnt->cmnd[0] += READ_10 - READ_6;
1201                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1202                 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1203                 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1204                 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1205                 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1206                 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1207                 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1208                 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1209         } else {
1210                 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1211                         /*
1212                          * This happens only if this drive failed
1213                          * 10byte rw command with ILLEGAL_REQUEST
1214                          * during operation and thus turned off
1215                          * use_10_for_rw.
1216                          */
1217                         scmd_printk(KERN_ERR, SCpnt,
1218                                     "FUA write on READ/WRITE(6) drive\n");
1219                         goto out;
1220                 }
1221
1222                 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1223                 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1224                 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1225                 SCpnt->cmnd[4] = (unsigned char) this_count;
1226                 SCpnt->cmnd[5] = 0;
1227         }
1228         SCpnt->sdb.length = this_count * sdp->sector_size;
1229
1230         /*
1231          * We shouldn't disconnect in the middle of a sector, so with a dumb
1232          * host adapter, it's safe to assume that we can at least transfer
1233          * this many bytes between each connect / disconnect.
1234          */
1235         SCpnt->transfersize = sdp->sector_size;
1236         SCpnt->underflow = this_count << 9;
1237         SCpnt->allowed = SD_MAX_RETRIES;
1238
1239         /*
1240          * This indicates that the command is ready from our end to be
1241          * queued.
1242          */
1243         ret = BLKPREP_OK;
1244  out:
1245         return ret;
1246 }
1247
1248 static int sd_init_command(struct scsi_cmnd *cmd)
1249 {
1250         struct request *rq = cmd->request;
1251
1252         switch (req_op(rq)) {
1253         case REQ_OP_DISCARD:
1254                 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1255                 case SD_LBP_UNMAP:
1256                         return sd_setup_unmap_cmnd(cmd);
1257                 case SD_LBP_WS16:
1258                         return sd_setup_write_same16_cmnd(cmd, true);
1259                 case SD_LBP_WS10:
1260                         return sd_setup_write_same10_cmnd(cmd, true);
1261                 case SD_LBP_ZERO:
1262                         return sd_setup_write_same10_cmnd(cmd, false);
1263                 default:
1264                         return BLKPREP_INVALID;
1265                 }
1266         case REQ_OP_WRITE_ZEROES:
1267                 return sd_setup_write_zeroes_cmnd(cmd);
1268         case REQ_OP_WRITE_SAME:
1269                 return sd_setup_write_same_cmnd(cmd);
1270         case REQ_OP_FLUSH:
1271                 return sd_setup_flush_cmnd(cmd);
1272         case REQ_OP_READ:
1273         case REQ_OP_WRITE:
1274                 return sd_setup_read_write_cmnd(cmd);
1275         case REQ_OP_ZONE_RESET:
1276                 return sd_zbc_setup_reset_cmnd(cmd);
1277         default:
1278                 WARN_ON_ONCE(1);
1279                 return BLKPREP_KILL;
1280         }
1281 }
1282
1283 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1284 {
1285         struct request *rq = SCpnt->request;
1286         u8 *cmnd;
1287
1288         if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1289                 __free_page(rq->special_vec.bv_page);
1290
1291         if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1292                 cmnd = SCpnt->cmnd;
1293                 SCpnt->cmnd = NULL;
1294                 SCpnt->cmd_len = 0;
1295                 mempool_free(cmnd, sd_cdb_pool);
1296         }
1297 }
1298
1299 /**
1300  *      sd_open - open a scsi disk device
1301  *      @bdev: Block device of the scsi disk to open
1302  *      @mode: FMODE_* mask
1303  *
1304  *      Returns 0 if successful. Returns a negated errno value in case
1305  *      of error.
1306  *
1307  *      Note: This can be called from a user context (e.g. fsck(1) )
1308  *      or from within the kernel (e.g. as a result of a mount(1) ).
1309  *      In the latter case @inode and @filp carry an abridged amount
1310  *      of information as noted above.
1311  *
1312  *      Locking: called with bdev->bd_mutex held.
1313  **/
1314 static int sd_open(struct block_device *bdev, fmode_t mode)
1315 {
1316         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1317         struct scsi_device *sdev;
1318         int retval;
1319
1320         if (!sdkp)
1321                 return -ENXIO;
1322
1323         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1324
1325         sdev = sdkp->device;
1326
1327         /*
1328          * If the device is in error recovery, wait until it is done.
1329          * If the device is offline, then disallow any access to it.
1330          */
1331         retval = -ENXIO;
1332         if (!scsi_block_when_processing_errors(sdev))
1333                 goto error_out;
1334
1335         if (sdev->removable || sdkp->write_prot)
1336                 check_disk_change(bdev);
1337
1338         /*
1339          * If the drive is empty, just let the open fail.
1340          */
1341         retval = -ENOMEDIUM;
1342         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1343                 goto error_out;
1344
1345         /*
1346          * If the device has the write protect tab set, have the open fail
1347          * if the user expects to be able to write to the thing.
1348          */
1349         retval = -EROFS;
1350         if (sdkp->write_prot && (mode & FMODE_WRITE))
1351                 goto error_out;
1352
1353         /*
1354          * It is possible that the disk changing stuff resulted in
1355          * the device being taken offline.  If this is the case,
1356          * report this to the user, and don't pretend that the
1357          * open actually succeeded.
1358          */
1359         retval = -ENXIO;
1360         if (!scsi_device_online(sdev))
1361                 goto error_out;
1362
1363         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1364                 if (scsi_block_when_processing_errors(sdev))
1365                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1366         }
1367
1368         return 0;
1369
1370 error_out:
1371         scsi_disk_put(sdkp);
1372         return retval;
1373 }
1374
1375 /**
1376  *      sd_release - invoked when the (last) close(2) is called on this
1377  *      scsi disk.
1378  *      @disk: disk to release
1379  *      @mode: FMODE_* mask
1380  *
1381  *      Returns 0.
1382  *
1383  *      Note: may block (uninterruptible) if error recovery is underway
1384  *      on this disk.
1385  *
1386  *      Locking: called with bdev->bd_mutex held.
1387  **/
1388 static void sd_release(struct gendisk *disk, fmode_t mode)
1389 {
1390         struct scsi_disk *sdkp = scsi_disk(disk);
1391         struct scsi_device *sdev = sdkp->device;
1392
1393         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1394
1395         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1396                 if (scsi_block_when_processing_errors(sdev))
1397                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1398         }
1399
1400         /*
1401          * XXX and what if there are packets in flight and this close()
1402          * XXX is followed by a "rmmod sd_mod"?
1403          */
1404
1405         scsi_disk_put(sdkp);
1406 }
1407
1408 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1409 {
1410         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1411         struct scsi_device *sdp = sdkp->device;
1412         struct Scsi_Host *host = sdp->host;
1413         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1414         int diskinfo[4];
1415
1416         /* default to most commonly used values */
1417         diskinfo[0] = 0x40;     /* 1 << 6 */
1418         diskinfo[1] = 0x20;     /* 1 << 5 */
1419         diskinfo[2] = capacity >> 11;
1420
1421         /* override with calculated, extended default, or driver values */
1422         if (host->hostt->bios_param)
1423                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1424         else
1425                 scsicam_bios_param(bdev, capacity, diskinfo);
1426
1427         geo->heads = diskinfo[0];
1428         geo->sectors = diskinfo[1];
1429         geo->cylinders = diskinfo[2];
1430         return 0;
1431 }
1432
1433 /**
1434  *      sd_ioctl - process an ioctl
1435  *      @bdev: target block device
1436  *      @mode: FMODE_* mask
1437  *      @cmd: ioctl command number
1438  *      @arg: this is third argument given to ioctl(2) system call.
1439  *      Often contains a pointer.
1440  *
1441  *      Returns 0 if successful (some ioctls return positive numbers on
1442  *      success as well). Returns a negated errno value in case of error.
1443  *
1444  *      Note: most ioctls are forward onto the block subsystem or further
1445  *      down in the scsi subsystem.
1446  **/
1447 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1448                     unsigned int cmd, unsigned long arg)
1449 {
1450         struct gendisk *disk = bdev->bd_disk;
1451         struct scsi_disk *sdkp = scsi_disk(disk);
1452         struct scsi_device *sdp = sdkp->device;
1453         void __user *p = (void __user *)arg;
1454         int error;
1455
1456         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1457                                     "cmd=0x%x\n", disk->disk_name, cmd));
1458
1459         error = scsi_verify_blk_ioctl(bdev, cmd);
1460         if (error < 0)
1461                 return error;
1462
1463         /*
1464          * If we are in the middle of error recovery, don't let anyone
1465          * else try and use this device.  Also, if error recovery fails, it
1466          * may try and take the device offline, in which case all further
1467          * access to the device is prohibited.
1468          */
1469         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1470                         (mode & FMODE_NDELAY) != 0);
1471         if (error)
1472                 goto out;
1473
1474         if (is_sed_ioctl(cmd))
1475                 return sed_ioctl(sdkp->opal_dev, cmd, p);
1476
1477         /*
1478          * Send SCSI addressing ioctls directly to mid level, send other
1479          * ioctls to block level and then onto mid level if they can't be
1480          * resolved.
1481          */
1482         switch (cmd) {
1483                 case SCSI_IOCTL_GET_IDLUN:
1484                 case SCSI_IOCTL_GET_BUS_NUMBER:
1485                         error = scsi_ioctl(sdp, cmd, p);
1486                         break;
1487                 default:
1488                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1489                         if (error != -ENOTTY)
1490                                 break;
1491                         error = scsi_ioctl(sdp, cmd, p);
1492                         break;
1493         }
1494 out:
1495         return error;
1496 }
1497
1498 static void set_media_not_present(struct scsi_disk *sdkp)
1499 {
1500         if (sdkp->media_present)
1501                 sdkp->device->changed = 1;
1502
1503         if (sdkp->device->removable) {
1504                 sdkp->media_present = 0;
1505                 sdkp->capacity = 0;
1506         }
1507 }
1508
1509 static int media_not_present(struct scsi_disk *sdkp,
1510                              struct scsi_sense_hdr *sshdr)
1511 {
1512         if (!scsi_sense_valid(sshdr))
1513                 return 0;
1514
1515         /* not invoked for commands that could return deferred errors */
1516         switch (sshdr->sense_key) {
1517         case UNIT_ATTENTION:
1518         case NOT_READY:
1519                 /* medium not present */
1520                 if (sshdr->asc == 0x3A) {
1521                         set_media_not_present(sdkp);
1522                         return 1;
1523                 }
1524         }
1525         return 0;
1526 }
1527
1528 /**
1529  *      sd_check_events - check media events
1530  *      @disk: kernel device descriptor
1531  *      @clearing: disk events currently being cleared
1532  *
1533  *      Returns mask of DISK_EVENT_*.
1534  *
1535  *      Note: this function is invoked from the block subsystem.
1536  **/
1537 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1538 {
1539         struct scsi_disk *sdkp = scsi_disk_get(disk);
1540         struct scsi_device *sdp;
1541         int retval;
1542
1543         if (!sdkp)
1544                 return 0;
1545
1546         sdp = sdkp->device;
1547         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1548
1549         /*
1550          * If the device is offline, don't send any commands - just pretend as
1551          * if the command failed.  If the device ever comes back online, we
1552          * can deal with it then.  It is only because of unrecoverable errors
1553          * that we would ever take a device offline in the first place.
1554          */
1555         if (!scsi_device_online(sdp)) {
1556                 set_media_not_present(sdkp);
1557                 goto out;
1558         }
1559
1560         /*
1561          * Using TEST_UNIT_READY enables differentiation between drive with
1562          * no cartridge loaded - NOT READY, drive with changed cartridge -
1563          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1564          *
1565          * Drives that auto spin down. eg iomega jaz 1G, will be started
1566          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1567          * sd_revalidate() is called.
1568          */
1569         if (scsi_block_when_processing_errors(sdp)) {
1570                 struct scsi_sense_hdr sshdr = { 0, };
1571
1572                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1573                                               &sshdr);
1574
1575                 /* failed to execute TUR, assume media not present */
1576                 if (host_byte(retval)) {
1577                         set_media_not_present(sdkp);
1578                         goto out;
1579                 }
1580
1581                 if (media_not_present(sdkp, &sshdr))
1582                         goto out;
1583         }
1584
1585         /*
1586          * For removable scsi disk we have to recognise the presence
1587          * of a disk in the drive.
1588          */
1589         if (!sdkp->media_present)
1590                 sdp->changed = 1;
1591         sdkp->media_present = 1;
1592 out:
1593         /*
1594          * sdp->changed is set under the following conditions:
1595          *
1596          *      Medium present state has changed in either direction.
1597          *      Device has indicated UNIT_ATTENTION.
1598          */
1599         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1600         sdp->changed = 0;
1601         scsi_disk_put(sdkp);
1602         return retval;
1603 }
1604
1605 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1606 {
1607         int retries, res;
1608         struct scsi_device *sdp = sdkp->device;
1609         const int timeout = sdp->request_queue->rq_timeout
1610                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1611         struct scsi_sense_hdr my_sshdr;
1612
1613         if (!scsi_device_online(sdp))
1614                 return -ENODEV;
1615
1616         /* caller might not be interested in sense, but we need it */
1617         if (!sshdr)
1618                 sshdr = &my_sshdr;
1619
1620         for (retries = 3; retries > 0; --retries) {
1621                 unsigned char cmd[10] = { 0 };
1622
1623                 cmd[0] = SYNCHRONIZE_CACHE;
1624                 /*
1625                  * Leave the rest of the command zero to indicate
1626                  * flush everything.
1627                  */
1628                 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1629                                 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1630                 if (res == 0)
1631                         break;
1632         }
1633
1634         if (res) {
1635                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1636
1637                 if (driver_byte(res) == DRIVER_SENSE)
1638                         sd_print_sense_hdr(sdkp, sshdr);
1639
1640                 /* we need to evaluate the error return  */
1641                 if (scsi_sense_valid(sshdr) &&
1642                         (sshdr->asc == 0x3a ||  /* medium not present */
1643                          sshdr->asc == 0x20))   /* invalid command */
1644                                 /* this is no error here */
1645                                 return 0;
1646
1647                 switch (host_byte(res)) {
1648                 /* ignore errors due to racing a disconnection */
1649                 case DID_BAD_TARGET:
1650                 case DID_NO_CONNECT:
1651                         return 0;
1652                 /* signal the upper layer it might try again */
1653                 case DID_BUS_BUSY:
1654                 case DID_IMM_RETRY:
1655                 case DID_REQUEUE:
1656                 case DID_SOFT_ERROR:
1657                         return -EBUSY;
1658                 default:
1659                         return -EIO;
1660                 }
1661         }
1662         return 0;
1663 }
1664
1665 static void sd_rescan(struct device *dev)
1666 {
1667         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1668
1669         revalidate_disk(sdkp->disk);
1670 }
1671
1672
1673 #ifdef CONFIG_COMPAT
1674 /*
1675  * This gets directly called from VFS. When the ioctl
1676  * is not recognized we go back to the other translation paths.
1677  */
1678 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1679                            unsigned int cmd, unsigned long arg)
1680 {
1681         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1682         int error;
1683
1684         error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1685                         (mode & FMODE_NDELAY) != 0);
1686         if (error)
1687                 return error;
1688
1689         /*
1690          * Let the static ioctl translation table take care of it.
1691          */
1692         if (!sdev->host->hostt->compat_ioctl)
1693                 return -ENOIOCTLCMD;
1694         return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1695 }
1696 #endif
1697
1698 static char sd_pr_type(enum pr_type type)
1699 {
1700         switch (type) {
1701         case PR_WRITE_EXCLUSIVE:
1702                 return 0x01;
1703         case PR_EXCLUSIVE_ACCESS:
1704                 return 0x03;
1705         case PR_WRITE_EXCLUSIVE_REG_ONLY:
1706                 return 0x05;
1707         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1708                 return 0x06;
1709         case PR_WRITE_EXCLUSIVE_ALL_REGS:
1710                 return 0x07;
1711         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1712                 return 0x08;
1713         default:
1714                 return 0;
1715         }
1716 };
1717
1718 static int sd_pr_command(struct block_device *bdev, u8 sa,
1719                 u64 key, u64 sa_key, u8 type, u8 flags)
1720 {
1721         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1722         struct scsi_sense_hdr sshdr;
1723         int result;
1724         u8 cmd[16] = { 0, };
1725         u8 data[24] = { 0, };
1726
1727         cmd[0] = PERSISTENT_RESERVE_OUT;
1728         cmd[1] = sa;
1729         cmd[2] = type;
1730         put_unaligned_be32(sizeof(data), &cmd[5]);
1731
1732         put_unaligned_be64(key, &data[0]);
1733         put_unaligned_be64(sa_key, &data[8]);
1734         data[20] = flags;
1735
1736         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1737                         &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1738
1739         if (driver_byte(result) == DRIVER_SENSE &&
1740             scsi_sense_valid(&sshdr)) {
1741                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1742                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1743         }
1744
1745         return result;
1746 }
1747
1748 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1749                 u32 flags)
1750 {
1751         if (flags & ~PR_FL_IGNORE_KEY)
1752                 return -EOPNOTSUPP;
1753         return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1754                         old_key, new_key, 0,
1755                         (1 << 0) /* APTPL */);
1756 }
1757
1758 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1759                 u32 flags)
1760 {
1761         if (flags)
1762                 return -EOPNOTSUPP;
1763         return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1764 }
1765
1766 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1767 {
1768         return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1769 }
1770
1771 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1772                 enum pr_type type, bool abort)
1773 {
1774         return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1775                              sd_pr_type(type), 0);
1776 }
1777
1778 static int sd_pr_clear(struct block_device *bdev, u64 key)
1779 {
1780         return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1781 }
1782
1783 static const struct pr_ops sd_pr_ops = {
1784         .pr_register    = sd_pr_register,
1785         .pr_reserve     = sd_pr_reserve,
1786         .pr_release     = sd_pr_release,
1787         .pr_preempt     = sd_pr_preempt,
1788         .pr_clear       = sd_pr_clear,
1789 };
1790
1791 static const struct block_device_operations sd_fops = {
1792         .owner                  = THIS_MODULE,
1793         .open                   = sd_open,
1794         .release                = sd_release,
1795         .ioctl                  = sd_ioctl,
1796         .getgeo                 = sd_getgeo,
1797 #ifdef CONFIG_COMPAT
1798         .compat_ioctl           = sd_compat_ioctl,
1799 #endif
1800         .check_events           = sd_check_events,
1801         .revalidate_disk        = sd_revalidate_disk,
1802         .unlock_native_capacity = sd_unlock_native_capacity,
1803         .report_zones           = sd_zbc_report_zones,
1804         .pr_ops                 = &sd_pr_ops,
1805 };
1806
1807 /**
1808  *      sd_eh_reset - reset error handling callback
1809  *      @scmd:          sd-issued command that has failed
1810  *
1811  *      This function is called by the SCSI midlayer before starting
1812  *      SCSI EH. When counting medium access failures we have to be
1813  *      careful to register it only only once per device and SCSI EH run;
1814  *      there might be several timed out commands which will cause the
1815  *      'max_medium_access_timeouts' counter to trigger after the first
1816  *      SCSI EH run already and set the device to offline.
1817  *      So this function resets the internal counter before starting SCSI EH.
1818  **/
1819 static void sd_eh_reset(struct scsi_cmnd *scmd)
1820 {
1821         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1822
1823         /* New SCSI EH run, reset gate variable */
1824         sdkp->ignore_medium_access_errors = false;
1825 }
1826
1827 /**
1828  *      sd_eh_action - error handling callback
1829  *      @scmd:          sd-issued command that has failed
1830  *      @eh_disp:       The recovery disposition suggested by the midlayer
1831  *
1832  *      This function is called by the SCSI midlayer upon completion of an
1833  *      error test command (currently TEST UNIT READY). The result of sending
1834  *      the eh command is passed in eh_disp.  We're looking for devices that
1835  *      fail medium access commands but are OK with non access commands like
1836  *      test unit ready (so wrongly see the device as having a successful
1837  *      recovery)
1838  **/
1839 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1840 {
1841         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1842         struct scsi_device *sdev = scmd->device;
1843
1844         if (!scsi_device_online(sdev) ||
1845             !scsi_medium_access_command(scmd) ||
1846             host_byte(scmd->result) != DID_TIME_OUT ||
1847             eh_disp != SUCCESS)
1848                 return eh_disp;
1849
1850         /*
1851          * The device has timed out executing a medium access command.
1852          * However, the TEST UNIT READY command sent during error
1853          * handling completed successfully. Either the device is in the
1854          * process of recovering or has it suffered an internal failure
1855          * that prevents access to the storage medium.
1856          */
1857         if (!sdkp->ignore_medium_access_errors) {
1858                 sdkp->medium_access_timed_out++;
1859                 sdkp->ignore_medium_access_errors = true;
1860         }
1861
1862         /*
1863          * If the device keeps failing read/write commands but TEST UNIT
1864          * READY always completes successfully we assume that medium
1865          * access is no longer possible and take the device offline.
1866          */
1867         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1868                 scmd_printk(KERN_ERR, scmd,
1869                             "Medium access timeout failure. Offlining disk!\n");
1870                 mutex_lock(&sdev->state_mutex);
1871                 scsi_device_set_state(sdev, SDEV_OFFLINE);
1872                 mutex_unlock(&sdev->state_mutex);
1873
1874                 return SUCCESS;
1875         }
1876
1877         return eh_disp;
1878 }
1879
1880 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1881 {
1882         struct request *req = scmd->request;
1883         struct scsi_device *sdev = scmd->device;
1884         unsigned int transferred, good_bytes;
1885         u64 start_lba, end_lba, bad_lba;
1886
1887         /*
1888          * Some commands have a payload smaller than the device logical
1889          * block size (e.g. INQUIRY on a 4K disk).
1890          */
1891         if (scsi_bufflen(scmd) <= sdev->sector_size)
1892                 return 0;
1893
1894         /* Check if we have a 'bad_lba' information */
1895         if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1896                                      SCSI_SENSE_BUFFERSIZE,
1897                                      &bad_lba))
1898                 return 0;
1899
1900         /*
1901          * If the bad lba was reported incorrectly, we have no idea where
1902          * the error is.
1903          */
1904         start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1905         end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1906         if (bad_lba < start_lba || bad_lba >= end_lba)
1907                 return 0;
1908
1909         /*
1910          * resid is optional but mostly filled in.  When it's unused,
1911          * its value is zero, so we assume the whole buffer transferred
1912          */
1913         transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1914
1915         /* This computation should always be done in terms of the
1916          * resolution of the device's medium.
1917          */
1918         good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1919
1920         return min(good_bytes, transferred);
1921 }
1922
1923 /**
1924  *      sd_done - bottom half handler: called when the lower level
1925  *      driver has completed (successfully or otherwise) a scsi command.
1926  *      @SCpnt: mid-level's per command structure.
1927  *
1928  *      Note: potentially run from within an ISR. Must not block.
1929  **/
1930 static int sd_done(struct scsi_cmnd *SCpnt)
1931 {
1932         int result = SCpnt->result;
1933         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1934         unsigned int sector_size = SCpnt->device->sector_size;
1935         unsigned int resid;
1936         struct scsi_sense_hdr sshdr;
1937         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1938         struct request *req = SCpnt->request;
1939         int sense_valid = 0;
1940         int sense_deferred = 0;
1941
1942         switch (req_op(req)) {
1943         case REQ_OP_DISCARD:
1944         case REQ_OP_WRITE_ZEROES:
1945         case REQ_OP_WRITE_SAME:
1946         case REQ_OP_ZONE_RESET:
1947                 if (!result) {
1948                         good_bytes = blk_rq_bytes(req);
1949                         scsi_set_resid(SCpnt, 0);
1950                 } else {
1951                         good_bytes = 0;
1952                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1953                 }
1954                 break;
1955         default:
1956                 /*
1957                  * In case of bogus fw or device, we could end up having
1958                  * an unaligned partial completion. Check this here and force
1959                  * alignment.
1960                  */
1961                 resid = scsi_get_resid(SCpnt);
1962                 if (resid & (sector_size - 1)) {
1963                         sd_printk(KERN_INFO, sdkp,
1964                                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1965                                 resid, sector_size);
1966                         resid = min(scsi_bufflen(SCpnt),
1967                                     round_up(resid, sector_size));
1968                         scsi_set_resid(SCpnt, resid);
1969                 }
1970         }
1971
1972         if (result) {
1973                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1974                 if (sense_valid)
1975                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1976         }
1977         sdkp->medium_access_timed_out = 0;
1978
1979         if (driver_byte(result) != DRIVER_SENSE &&
1980             (!sense_valid || sense_deferred))
1981                 goto out;
1982
1983         switch (sshdr.sense_key) {
1984         case HARDWARE_ERROR:
1985         case MEDIUM_ERROR:
1986                 good_bytes = sd_completed_bytes(SCpnt);
1987                 break;
1988         case RECOVERED_ERROR:
1989                 good_bytes = scsi_bufflen(SCpnt);
1990                 break;
1991         case NO_SENSE:
1992                 /* This indicates a false check condition, so ignore it.  An
1993                  * unknown amount of data was transferred so treat it as an
1994                  * error.
1995                  */
1996                 SCpnt->result = 0;
1997                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1998                 break;
1999         case ABORTED_COMMAND:
2000                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
2001                         good_bytes = sd_completed_bytes(SCpnt);
2002                 break;
2003         case ILLEGAL_REQUEST:
2004                 switch (sshdr.asc) {
2005                 case 0x10:      /* DIX: Host detected corruption */
2006                         good_bytes = sd_completed_bytes(SCpnt);
2007                         break;
2008                 case 0x20:      /* INVALID COMMAND OPCODE */
2009                 case 0x24:      /* INVALID FIELD IN CDB */
2010                         switch (SCpnt->cmnd[0]) {
2011                         case UNMAP:
2012                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2013                                 break;
2014                         case WRITE_SAME_16:
2015                         case WRITE_SAME:
2016                                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2017                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
2018                                 } else {
2019                                         sdkp->device->no_write_same = 1;
2020                                         sd_config_write_same(sdkp);
2021                                         req->rq_flags |= RQF_QUIET;
2022                                 }
2023                                 break;
2024                         }
2025                 }
2026                 break;
2027         default:
2028                 break;
2029         }
2030
2031  out:
2032         if (sd_is_zoned(sdkp))
2033                 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2034
2035         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2036                                            "sd_done: completed %d of %d bytes\n",
2037                                            good_bytes, scsi_bufflen(SCpnt)));
2038
2039         if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt) &&
2040             good_bytes)
2041                 t10_pi_complete(SCpnt->request, sdkp->protection_type,
2042                                 good_bytes / scsi_prot_interval(SCpnt));
2043
2044         return good_bytes;
2045 }
2046
2047 /*
2048  * spinup disk - called only in sd_revalidate_disk()
2049  */
2050 static void
2051 sd_spinup_disk(struct scsi_disk *sdkp)
2052 {
2053         unsigned char cmd[10];
2054         unsigned long spintime_expire = 0;
2055         int retries, spintime;
2056         unsigned int the_result;
2057         struct scsi_sense_hdr sshdr;
2058         int sense_valid = 0;
2059
2060         spintime = 0;
2061
2062         /* Spin up drives, as required.  Only do this at boot time */
2063         /* Spinup needs to be done for module loads too. */
2064         do {
2065                 retries = 0;
2066
2067                 do {
2068                         cmd[0] = TEST_UNIT_READY;
2069                         memset((void *) &cmd[1], 0, 9);
2070
2071                         the_result = scsi_execute_req(sdkp->device, cmd,
2072                                                       DMA_NONE, NULL, 0,
2073                                                       &sshdr, SD_TIMEOUT,
2074                                                       SD_MAX_RETRIES, NULL);
2075
2076                         /*
2077                          * If the drive has indicated to us that it
2078                          * doesn't have any media in it, don't bother
2079                          * with any more polling.
2080                          */
2081                         if (media_not_present(sdkp, &sshdr))
2082                                 return;
2083
2084                         if (the_result)
2085                                 sense_valid = scsi_sense_valid(&sshdr);
2086                         retries++;
2087                 } while (retries < 3 &&
2088                          (!scsi_status_is_good(the_result) ||
2089                           ((driver_byte(the_result) == DRIVER_SENSE) &&
2090                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2091
2092                 if (driver_byte(the_result) != DRIVER_SENSE) {
2093                         /* no sense, TUR either succeeded or failed
2094                          * with a status error */
2095                         if(!spintime && !scsi_status_is_good(the_result)) {
2096                                 sd_print_result(sdkp, "Test Unit Ready failed",
2097                                                 the_result);
2098                         }
2099                         break;
2100                 }
2101
2102                 /*
2103                  * The device does not want the automatic start to be issued.
2104                  */
2105                 if (sdkp->device->no_start_on_add)
2106                         break;
2107
2108                 if (sense_valid && sshdr.sense_key == NOT_READY) {
2109                         if (sshdr.asc == 4 && sshdr.ascq == 3)
2110                                 break;  /* manual intervention required */
2111                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2112                                 break;  /* standby */
2113                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2114                                 break;  /* unavailable */
2115                         if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2116                                 break;  /* sanitize in progress */
2117                         /*
2118                          * Issue command to spin up drive when not ready
2119                          */
2120                         if (!spintime) {
2121                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2122                                 cmd[0] = START_STOP;
2123                                 cmd[1] = 1;     /* Return immediately */
2124                                 memset((void *) &cmd[2], 0, 8);
2125                                 cmd[4] = 1;     /* Start spin cycle */
2126                                 if (sdkp->device->start_stop_pwr_cond)
2127                                         cmd[4] |= 1 << 4;
2128                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2129                                                  NULL, 0, &sshdr,
2130                                                  SD_TIMEOUT, SD_MAX_RETRIES,
2131                                                  NULL);
2132                                 spintime_expire = jiffies + 100 * HZ;
2133                                 spintime = 1;
2134                         }
2135                         /* Wait 1 second for next try */
2136                         msleep(1000);
2137                         printk(KERN_CONT ".");
2138
2139                 /*
2140                  * Wait for USB flash devices with slow firmware.
2141                  * Yes, this sense key/ASC combination shouldn't
2142                  * occur here.  It's characteristic of these devices.
2143                  */
2144                 } else if (sense_valid &&
2145                                 sshdr.sense_key == UNIT_ATTENTION &&
2146                                 sshdr.asc == 0x28) {
2147                         if (!spintime) {
2148                                 spintime_expire = jiffies + 5 * HZ;
2149                                 spintime = 1;
2150                         }
2151                         /* Wait 1 second for next try */
2152                         msleep(1000);
2153                 } else {
2154                         /* we don't understand the sense code, so it's
2155                          * probably pointless to loop */
2156                         if(!spintime) {
2157                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2158                                 sd_print_sense_hdr(sdkp, &sshdr);
2159                         }
2160                         break;
2161                 }
2162
2163         } while (spintime && time_before_eq(jiffies, spintime_expire));
2164
2165         if (spintime) {
2166                 if (scsi_status_is_good(the_result))
2167                         printk(KERN_CONT "ready\n");
2168                 else
2169                         printk(KERN_CONT "not responding...\n");
2170         }
2171 }
2172
2173 /*
2174  * Determine whether disk supports Data Integrity Field.
2175  */
2176 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2177 {
2178         struct scsi_device *sdp = sdkp->device;
2179         u8 type;
2180         int ret = 0;
2181
2182         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2183                 return ret;
2184
2185         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2186
2187         if (type > T10_PI_TYPE3_PROTECTION)
2188                 ret = -ENODEV;
2189         else if (scsi_host_dif_capable(sdp->host, type))
2190                 ret = 1;
2191
2192         if (sdkp->first_scan || type != sdkp->protection_type)
2193                 switch (ret) {
2194                 case -ENODEV:
2195                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2196                                   " protection type %u. Disabling disk!\n",
2197                                   type);
2198                         break;
2199                 case 1:
2200                         sd_printk(KERN_NOTICE, sdkp,
2201                                   "Enabling DIF Type %u protection\n", type);
2202                         break;
2203                 case 0:
2204                         sd_printk(KERN_NOTICE, sdkp,
2205                                   "Disabling DIF Type %u protection\n", type);
2206                         break;
2207                 }
2208
2209         sdkp->protection_type = type;
2210
2211         return ret;
2212 }
2213
2214 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2215                         struct scsi_sense_hdr *sshdr, int sense_valid,
2216                         int the_result)
2217 {
2218         if (driver_byte(the_result) == DRIVER_SENSE)
2219                 sd_print_sense_hdr(sdkp, sshdr);
2220         else
2221                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2222
2223         /*
2224          * Set dirty bit for removable devices if not ready -
2225          * sometimes drives will not report this properly.
2226          */
2227         if (sdp->removable &&
2228             sense_valid && sshdr->sense_key == NOT_READY)
2229                 set_media_not_present(sdkp);
2230
2231         /*
2232          * We used to set media_present to 0 here to indicate no media
2233          * in the drive, but some drives fail read capacity even with
2234          * media present, so we can't do that.
2235          */
2236         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2237 }
2238
2239 #define RC16_LEN 32
2240 #if RC16_LEN > SD_BUF_SIZE
2241 #error RC16_LEN must not be more than SD_BUF_SIZE
2242 #endif
2243
2244 #define READ_CAPACITY_RETRIES_ON_RESET  10
2245
2246 /*
2247  * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
2248  * and the reported logical block size is bigger than 512 bytes. Note
2249  * that last_sector is a u64 and therefore logical_to_sectors() is not
2250  * applicable.
2251  */
2252 static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
2253 {
2254         u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
2255
2256         if (sizeof(sector_t) == 4 && last_sector > U32_MAX)
2257                 return false;
2258
2259         return true;
2260 }
2261
2262 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2263                                                 unsigned char *buffer)
2264 {
2265         unsigned char cmd[16];
2266         struct scsi_sense_hdr sshdr;
2267         int sense_valid = 0;
2268         int the_result;
2269         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2270         unsigned int alignment;
2271         unsigned long long lba;
2272         unsigned sector_size;
2273
2274         if (sdp->no_read_capacity_16)
2275                 return -EINVAL;
2276
2277         do {
2278                 memset(cmd, 0, 16);
2279                 cmd[0] = SERVICE_ACTION_IN_16;
2280                 cmd[1] = SAI_READ_CAPACITY_16;
2281                 cmd[13] = RC16_LEN;
2282                 memset(buffer, 0, RC16_LEN);
2283
2284                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2285                                         buffer, RC16_LEN, &sshdr,
2286                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2287
2288                 if (media_not_present(sdkp, &sshdr))
2289                         return -ENODEV;
2290
2291                 if (the_result) {
2292                         sense_valid = scsi_sense_valid(&sshdr);
2293                         if (sense_valid &&
2294                             sshdr.sense_key == ILLEGAL_REQUEST &&
2295                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2296                             sshdr.ascq == 0x00)
2297                                 /* Invalid Command Operation Code or
2298                                  * Invalid Field in CDB, just retry
2299                                  * silently with RC10 */
2300                                 return -EINVAL;
2301                         if (sense_valid &&
2302                             sshdr.sense_key == UNIT_ATTENTION &&
2303                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2304                                 /* Device reset might occur several times,
2305                                  * give it one more chance */
2306                                 if (--reset_retries > 0)
2307                                         continue;
2308                 }
2309                 retries--;
2310
2311         } while (the_result && retries);
2312
2313         if (the_result) {
2314                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2315                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2316                 return -EINVAL;
2317         }
2318
2319         sector_size = get_unaligned_be32(&buffer[8]);
2320         lba = get_unaligned_be64(&buffer[0]);
2321
2322         if (sd_read_protection_type(sdkp, buffer) < 0) {
2323                 sdkp->capacity = 0;
2324                 return -ENODEV;
2325         }
2326
2327         if (!sd_addressable_capacity(lba, sector_size)) {
2328                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2329                         "kernel compiled with support for large block "
2330                         "devices.\n");
2331                 sdkp->capacity = 0;
2332                 return -EOVERFLOW;
2333         }
2334
2335         /* Logical blocks per physical block exponent */
2336         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2337
2338         /* RC basis */
2339         sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2340
2341         /* Lowest aligned logical block */
2342         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2343         blk_queue_alignment_offset(sdp->request_queue, alignment);
2344         if (alignment && sdkp->first_scan)
2345                 sd_printk(KERN_NOTICE, sdkp,
2346                           "physical block alignment offset: %u\n", alignment);
2347
2348         if (buffer[14] & 0x80) { /* LBPME */
2349                 sdkp->lbpme = 1;
2350
2351                 if (buffer[14] & 0x40) /* LBPRZ */
2352                         sdkp->lbprz = 1;
2353
2354                 sd_config_discard(sdkp, SD_LBP_WS16);
2355         }
2356
2357         sdkp->capacity = lba + 1;
2358         return sector_size;
2359 }
2360
2361 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2362                                                 unsigned char *buffer)
2363 {
2364         unsigned char cmd[16];
2365         struct scsi_sense_hdr sshdr;
2366         int sense_valid = 0;
2367         int the_result;
2368         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2369         sector_t lba;
2370         unsigned sector_size;
2371
2372         do {
2373                 cmd[0] = READ_CAPACITY;
2374                 memset(&cmd[1], 0, 9);
2375                 memset(buffer, 0, 8);
2376
2377                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2378                                         buffer, 8, &sshdr,
2379                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2380
2381                 if (media_not_present(sdkp, &sshdr))
2382                         return -ENODEV;
2383
2384                 if (the_result) {
2385                         sense_valid = scsi_sense_valid(&sshdr);
2386                         if (sense_valid &&
2387                             sshdr.sense_key == UNIT_ATTENTION &&
2388                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2389                                 /* Device reset might occur several times,
2390                                  * give it one more chance */
2391                                 if (--reset_retries > 0)
2392                                         continue;
2393                 }
2394                 retries--;
2395
2396         } while (the_result && retries);
2397
2398         if (the_result) {
2399                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2400                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2401                 return -EINVAL;
2402         }
2403
2404         sector_size = get_unaligned_be32(&buffer[4]);
2405         lba = get_unaligned_be32(&buffer[0]);
2406
2407         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2408                 /* Some buggy (usb cardreader) devices return an lba of
2409                    0xffffffff when the want to report a size of 0 (with
2410                    which they really mean no media is present) */
2411                 sdkp->capacity = 0;
2412                 sdkp->physical_block_size = sector_size;
2413                 return sector_size;
2414         }
2415
2416         if (!sd_addressable_capacity(lba, sector_size)) {
2417                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2418                         "kernel compiled with support for large block "
2419                         "devices.\n");
2420                 sdkp->capacity = 0;
2421                 return -EOVERFLOW;
2422         }
2423
2424         sdkp->capacity = lba + 1;
2425         sdkp->physical_block_size = sector_size;
2426         return sector_size;
2427 }
2428
2429 static int sd_try_rc16_first(struct scsi_device *sdp)
2430 {
2431         if (sdp->host->max_cmd_len < 16)
2432                 return 0;
2433         if (sdp->try_rc_10_first)
2434                 return 0;
2435         if (sdp->scsi_level > SCSI_SPC_2)
2436                 return 1;
2437         if (scsi_device_protection(sdp))
2438                 return 1;
2439         return 0;
2440 }
2441
2442 /*
2443  * read disk capacity
2444  */
2445 static void
2446 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2447 {
2448         int sector_size;
2449         struct scsi_device *sdp = sdkp->device;
2450
2451         if (sd_try_rc16_first(sdp)) {
2452                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2453                 if (sector_size == -EOVERFLOW)
2454                         goto got_data;
2455                 if (sector_size == -ENODEV)
2456                         return;
2457                 if (sector_size < 0)
2458                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2459                 if (sector_size < 0)
2460                         return;
2461         } else {
2462                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2463                 if (sector_size == -EOVERFLOW)
2464                         goto got_data;
2465                 if (sector_size < 0)
2466                         return;
2467                 if ((sizeof(sdkp->capacity) > 4) &&
2468                     (sdkp->capacity > 0xffffffffULL)) {
2469                         int old_sector_size = sector_size;
2470                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2471                                         "Trying to use READ CAPACITY(16).\n");
2472                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2473                         if (sector_size < 0) {
2474                                 sd_printk(KERN_NOTICE, sdkp,
2475                                         "Using 0xffffffff as device size\n");
2476                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2477                                 sector_size = old_sector_size;
2478                                 goto got_data;
2479                         }
2480                         /* Remember that READ CAPACITY(16) succeeded */
2481                         sdp->try_rc_10_first = 0;
2482                 }
2483         }
2484
2485         /* Some devices are known to return the total number of blocks,
2486          * not the highest block number.  Some devices have versions
2487          * which do this and others which do not.  Some devices we might
2488          * suspect of doing this but we don't know for certain.
2489          *
2490          * If we know the reported capacity is wrong, decrement it.  If
2491          * we can only guess, then assume the number of blocks is even
2492          * (usually true but not always) and err on the side of lowering
2493          * the capacity.
2494          */
2495         if (sdp->fix_capacity ||
2496             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2497                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2498                                 "from its reported value: %llu\n",
2499                                 (unsigned long long) sdkp->capacity);
2500                 --sdkp->capacity;
2501         }
2502
2503 got_data:
2504         if (sector_size == 0) {
2505                 sector_size = 512;
2506                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2507                           "assuming 512.\n");
2508         }
2509
2510         if (sector_size != 512 &&
2511             sector_size != 1024 &&
2512             sector_size != 2048 &&
2513             sector_size != 4096) {
2514                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2515                           sector_size);
2516                 /*
2517                  * The user might want to re-format the drive with
2518                  * a supported sectorsize.  Once this happens, it
2519                  * would be relatively trivial to set the thing up.
2520                  * For this reason, we leave the thing in the table.
2521                  */
2522                 sdkp->capacity = 0;
2523                 /*
2524                  * set a bogus sector size so the normal read/write
2525                  * logic in the block layer will eventually refuse any
2526                  * request on this device without tripping over power
2527                  * of two sector size assumptions
2528                  */
2529                 sector_size = 512;
2530         }
2531         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2532         blk_queue_physical_block_size(sdp->request_queue,
2533                                       sdkp->physical_block_size);
2534         sdkp->device->sector_size = sector_size;
2535
2536         if (sdkp->capacity > 0xffffffff)
2537                 sdp->use_16_for_rw = 1;
2538
2539 }
2540
2541 /*
2542  * Print disk capacity
2543  */
2544 static void
2545 sd_print_capacity(struct scsi_disk *sdkp,
2546                   sector_t old_capacity)
2547 {
2548         int sector_size = sdkp->device->sector_size;
2549         char cap_str_2[10], cap_str_10[10];
2550
2551         string_get_size(sdkp->capacity, sector_size,
2552                         STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2553         string_get_size(sdkp->capacity, sector_size,
2554                         STRING_UNITS_10, cap_str_10,
2555                         sizeof(cap_str_10));
2556
2557         if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2558                 sd_printk(KERN_NOTICE, sdkp,
2559                           "%llu %d-byte logical blocks: (%s/%s)\n",
2560                           (unsigned long long)sdkp->capacity,
2561                           sector_size, cap_str_10, cap_str_2);
2562
2563                 if (sdkp->physical_block_size != sector_size)
2564                         sd_printk(KERN_NOTICE, sdkp,
2565                                   "%u-byte physical blocks\n",
2566                                   sdkp->physical_block_size);
2567
2568                 sd_zbc_print_zones(sdkp);
2569         }
2570 }
2571
2572 /* called with buffer of length 512 */
2573 static inline int
2574 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2575                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2576                  struct scsi_sense_hdr *sshdr)
2577 {
2578         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2579                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2580                                sshdr);
2581 }
2582
2583 /*
2584  * read write protect setting, if possible - called only in sd_revalidate_disk()
2585  * called with buffer of length SD_BUF_SIZE
2586  */
2587 static void
2588 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2589 {
2590         int res;
2591         struct scsi_device *sdp = sdkp->device;
2592         struct scsi_mode_data data;
2593         int disk_ro = get_disk_ro(sdkp->disk);
2594         int old_wp = sdkp->write_prot;
2595
2596         set_disk_ro(sdkp->disk, 0);
2597         if (sdp->skip_ms_page_3f) {
2598                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2599                 return;
2600         }
2601
2602         if (sdp->use_192_bytes_for_3f) {
2603                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2604         } else {
2605                 /*
2606                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2607                  * We have to start carefully: some devices hang if we ask
2608                  * for more than is available.
2609                  */
2610                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2611
2612                 /*
2613                  * Second attempt: ask for page 0 When only page 0 is
2614                  * implemented, a request for page 3F may return Sense Key
2615                  * 5: Illegal Request, Sense Code 24: Invalid field in
2616                  * CDB.
2617                  */
2618                 if (!scsi_status_is_good(res))
2619                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2620
2621                 /*
2622                  * Third attempt: ask 255 bytes, as we did earlier.
2623                  */
2624                 if (!scsi_status_is_good(res))
2625                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2626                                                &data, NULL);
2627         }
2628
2629         if (!scsi_status_is_good(res)) {
2630                 sd_first_printk(KERN_WARNING, sdkp,
2631                           "Test WP failed, assume Write Enabled\n");
2632         } else {
2633                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2634                 set_disk_ro(sdkp->disk, sdkp->write_prot || disk_ro);
2635                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2636                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2637                                   sdkp->write_prot ? "on" : "off");
2638                         sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2639                 }
2640         }
2641 }
2642
2643 /*
2644  * sd_read_cache_type - called only from sd_revalidate_disk()
2645  * called with buffer of length SD_BUF_SIZE
2646  */
2647 static void
2648 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2649 {
2650         int len = 0, res;
2651         struct scsi_device *sdp = sdkp->device;
2652
2653         int dbd;
2654         int modepage;
2655         int first_len;
2656         struct scsi_mode_data data;
2657         struct scsi_sense_hdr sshdr;
2658         int old_wce = sdkp->WCE;
2659         int old_rcd = sdkp->RCD;
2660         int old_dpofua = sdkp->DPOFUA;
2661
2662
2663         if (sdkp->cache_override)
2664                 return;
2665
2666         first_len = 4;
2667         if (sdp->skip_ms_page_8) {
2668                 if (sdp->type == TYPE_RBC)
2669                         goto defaults;
2670                 else {
2671                         if (sdp->skip_ms_page_3f)
2672                                 goto defaults;
2673                         modepage = 0x3F;
2674                         if (sdp->use_192_bytes_for_3f)
2675                                 first_len = 192;
2676                         dbd = 0;
2677                 }
2678         } else if (sdp->type == TYPE_RBC) {
2679                 modepage = 6;
2680                 dbd = 8;
2681         } else {
2682                 modepage = 8;
2683                 dbd = 0;
2684         }
2685
2686         /* cautiously ask */
2687         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2688                         &data, &sshdr);
2689
2690         if (!scsi_status_is_good(res))
2691                 goto bad_sense;
2692
2693         if (!data.header_length) {
2694                 modepage = 6;
2695                 first_len = 0;
2696                 sd_first_printk(KERN_ERR, sdkp,
2697                                 "Missing header in MODE_SENSE response\n");
2698         }
2699
2700         /* that went OK, now ask for the proper length */
2701         len = data.length;
2702
2703         /*
2704          * We're only interested in the first three bytes, actually.
2705          * But the data cache page is defined for the first 20.
2706          */
2707         if (len < 3)
2708                 goto bad_sense;
2709         else if (len > SD_BUF_SIZE) {
2710                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2711                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2712                 len = SD_BUF_SIZE;
2713         }
2714         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2715                 len = 192;
2716
2717         /* Get the data */
2718         if (len > first_len)
2719                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2720                                 &data, &sshdr);
2721
2722         if (scsi_status_is_good(res)) {
2723                 int offset = data.header_length + data.block_descriptor_length;
2724
2725                 while (offset < len) {
2726                         u8 page_code = buffer[offset] & 0x3F;
2727                         u8 spf       = buffer[offset] & 0x40;
2728
2729                         if (page_code == 8 || page_code == 6) {
2730                                 /* We're interested only in the first 3 bytes.
2731                                  */
2732                                 if (len - offset <= 2) {
2733                                         sd_first_printk(KERN_ERR, sdkp,
2734                                                 "Incomplete mode parameter "
2735                                                         "data\n");
2736                                         goto defaults;
2737                                 } else {
2738                                         modepage = page_code;
2739                                         goto Page_found;
2740                                 }
2741                         } else {
2742                                 /* Go to the next page */
2743                                 if (spf && len - offset > 3)
2744                                         offset += 4 + (buffer[offset+2] << 8) +
2745                                                 buffer[offset+3];
2746                                 else if (!spf && len - offset > 1)
2747                                         offset += 2 + buffer[offset+1];
2748                                 else {
2749                                         sd_first_printk(KERN_ERR, sdkp,
2750                                                         "Incomplete mode "
2751                                                         "parameter data\n");
2752                                         goto defaults;
2753                                 }
2754                         }
2755                 }
2756
2757                 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2758                 goto defaults;
2759
2760         Page_found:
2761                 if (modepage == 8) {
2762                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2763                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2764                 } else {
2765                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2766                         sdkp->RCD = 0;
2767                 }
2768
2769                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2770                 if (sdp->broken_fua) {
2771                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2772                         sdkp->DPOFUA = 0;
2773                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2774                            !sdkp->device->use_16_for_rw) {
2775                         sd_first_printk(KERN_NOTICE, sdkp,
2776                                   "Uses READ/WRITE(6), disabling FUA\n");
2777                         sdkp->DPOFUA = 0;
2778                 }
2779
2780                 /* No cache flush allowed for write protected devices */
2781                 if (sdkp->WCE && sdkp->write_prot)
2782                         sdkp->WCE = 0;
2783
2784                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2785                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2786                         sd_printk(KERN_NOTICE, sdkp,
2787                                   "Write cache: %s, read cache: %s, %s\n",
2788                                   sdkp->WCE ? "enabled" : "disabled",
2789                                   sdkp->RCD ? "disabled" : "enabled",
2790                                   sdkp->DPOFUA ? "supports DPO and FUA"
2791                                   : "doesn't support DPO or FUA");
2792
2793                 return;
2794         }
2795
2796 bad_sense:
2797         if (scsi_sense_valid(&sshdr) &&
2798             sshdr.sense_key == ILLEGAL_REQUEST &&
2799             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2800                 /* Invalid field in CDB */
2801                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2802         else
2803                 sd_first_printk(KERN_ERR, sdkp,
2804                                 "Asking for cache data failed\n");
2805
2806 defaults:
2807         if (sdp->wce_default_on) {
2808                 sd_first_printk(KERN_NOTICE, sdkp,
2809                                 "Assuming drive cache: write back\n");
2810                 sdkp->WCE = 1;
2811         } else {
2812                 sd_first_printk(KERN_ERR, sdkp,
2813                                 "Assuming drive cache: write through\n");
2814                 sdkp->WCE = 0;
2815         }
2816         sdkp->RCD = 0;
2817         sdkp->DPOFUA = 0;
2818 }
2819
2820 /*
2821  * The ATO bit indicates whether the DIF application tag is available
2822  * for use by the operating system.
2823  */
2824 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2825 {
2826         int res, offset;
2827         struct scsi_device *sdp = sdkp->device;
2828         struct scsi_mode_data data;
2829         struct scsi_sense_hdr sshdr;
2830
2831         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2832                 return;
2833
2834         if (sdkp->protection_type == 0)
2835                 return;
2836
2837         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2838                               SD_MAX_RETRIES, &data, &sshdr);
2839
2840         if (!scsi_status_is_good(res) || !data.header_length ||
2841             data.length < 6) {
2842                 sd_first_printk(KERN_WARNING, sdkp,
2843                           "getting Control mode page failed, assume no ATO\n");
2844
2845                 if (scsi_sense_valid(&sshdr))
2846                         sd_print_sense_hdr(sdkp, &sshdr);
2847
2848                 return;
2849         }
2850
2851         offset = data.header_length + data.block_descriptor_length;
2852
2853         if ((buffer[offset] & 0x3f) != 0x0a) {
2854                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2855                 return;
2856         }
2857
2858         if ((buffer[offset + 5] & 0x80) == 0)
2859                 return;
2860
2861         sdkp->ATO = 1;
2862
2863         return;
2864 }
2865
2866 /**
2867  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2868  * @sdkp: disk to query
2869  */
2870 static void sd_read_block_limits(struct scsi_disk *sdkp)
2871 {
2872         unsigned int sector_sz = sdkp->device->sector_size;
2873         const int vpd_len = 64;
2874         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2875
2876         if (!buffer ||
2877             /* Block Limits VPD */
2878             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2879                 goto out;
2880
2881         blk_queue_io_min(sdkp->disk->queue,
2882                          get_unaligned_be16(&buffer[6]) * sector_sz);
2883
2884         sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2885         sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2886
2887         if (buffer[3] == 0x3c) {
2888                 unsigned int lba_count, desc_count;
2889
2890                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2891
2892                 if (!sdkp->lbpme)
2893                         goto out;
2894
2895                 lba_count = get_unaligned_be32(&buffer[20]);
2896                 desc_count = get_unaligned_be32(&buffer[24]);
2897
2898                 if (lba_count && desc_count)
2899                         sdkp->max_unmap_blocks = lba_count;
2900
2901                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2902
2903                 if (buffer[32] & 0x80)
2904                         sdkp->unmap_alignment =
2905                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2906
2907                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2908
2909                         if (sdkp->max_unmap_blocks)
2910                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2911                         else
2912                                 sd_config_discard(sdkp, SD_LBP_WS16);
2913
2914                 } else {        /* LBP VPD page tells us what to use */
2915                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2916                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2917                         else if (sdkp->lbpws)
2918                                 sd_config_discard(sdkp, SD_LBP_WS16);
2919                         else if (sdkp->lbpws10)
2920                                 sd_config_discard(sdkp, SD_LBP_WS10);
2921                         else
2922                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2923                 }
2924         }
2925
2926  out:
2927         kfree(buffer);
2928 }
2929
2930 /**
2931  * sd_read_block_characteristics - Query block dev. characteristics
2932  * @sdkp: disk to query
2933  */
2934 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2935 {
2936         struct request_queue *q = sdkp->disk->queue;
2937         unsigned char *buffer;
2938         u16 rot;
2939         const int vpd_len = 64;
2940
2941         buffer = kmalloc(vpd_len, GFP_KERNEL);
2942
2943         if (!buffer ||
2944             /* Block Device Characteristics VPD */
2945             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2946                 goto out;
2947
2948         rot = get_unaligned_be16(&buffer[4]);
2949
2950         if (rot == 1) {
2951                 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2952                 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2953         } else {
2954                 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
2955                 blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
2956         }
2957
2958         if (sdkp->device->type == TYPE_ZBC) {
2959                 /* Host-managed */
2960                 q->limits.zoned = BLK_ZONED_HM;
2961         } else {
2962                 sdkp->zoned = (buffer[8] >> 4) & 3;
2963                 if (sdkp->zoned == 1)
2964                         /* Host-aware */
2965                         q->limits.zoned = BLK_ZONED_HA;
2966                 else
2967                         /*
2968                          * Treat drive-managed devices as
2969                          * regular block devices.
2970                          */
2971                         q->limits.zoned = BLK_ZONED_NONE;
2972         }
2973         if (blk_queue_is_zoned(q) && sdkp->first_scan)
2974                 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2975                       q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2976
2977  out:
2978         kfree(buffer);
2979 }
2980
2981 /**
2982  * sd_read_block_provisioning - Query provisioning VPD page
2983  * @sdkp: disk to query
2984  */
2985 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2986 {
2987         unsigned char *buffer;
2988         const int vpd_len = 8;
2989
2990         if (sdkp->lbpme == 0)
2991                 return;
2992
2993         buffer = kmalloc(vpd_len, GFP_KERNEL);
2994
2995         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2996                 goto out;
2997
2998         sdkp->lbpvpd    = 1;
2999         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
3000         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
3001         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
3002
3003  out:
3004         kfree(buffer);
3005 }
3006
3007 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
3008 {
3009         struct scsi_device *sdev = sdkp->device;
3010
3011         if (sdev->host->no_write_same) {
3012                 sdev->no_write_same = 1;
3013
3014                 return;
3015         }
3016
3017         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
3018                 /* too large values might cause issues with arcmsr */
3019                 int vpd_buf_len = 64;
3020
3021                 sdev->no_report_opcodes = 1;
3022
3023                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3024                  * CODES is unsupported and the device has an ATA
3025                  * Information VPD page (SAT).
3026                  */
3027                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3028                         sdev->no_write_same = 1;
3029         }
3030
3031         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3032                 sdkp->ws16 = 1;
3033
3034         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3035                 sdkp->ws10 = 1;
3036 }
3037
3038 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3039 {
3040         struct scsi_device *sdev = sdkp->device;
3041
3042         if (!sdev->security_supported)
3043                 return;
3044
3045         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3046                         SECURITY_PROTOCOL_IN) == 1 &&
3047             scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3048                         SECURITY_PROTOCOL_OUT) == 1)
3049                 sdkp->security = 1;
3050 }
3051
3052 /**
3053  *      sd_revalidate_disk - called the first time a new disk is seen,
3054  *      performs disk spin up, read_capacity, etc.
3055  *      @disk: struct gendisk we care about
3056  **/
3057 static int sd_revalidate_disk(struct gendisk *disk)
3058 {
3059         struct scsi_disk *sdkp = scsi_disk(disk);
3060         struct scsi_device *sdp = sdkp->device;
3061         struct request_queue *q = sdkp->disk->queue;
3062         sector_t old_capacity = sdkp->capacity;
3063         unsigned char *buffer;
3064         unsigned int dev_max, rw_max;
3065
3066         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3067                                       "sd_revalidate_disk\n"));
3068
3069         /*
3070          * If the device is offline, don't try and read capacity or any
3071          * of the other niceties.
3072          */
3073         if (!scsi_device_online(sdp))
3074                 goto out;
3075
3076         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3077         if (!buffer) {
3078                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3079                           "allocation failure.\n");
3080                 goto out;
3081         }
3082
3083         sd_spinup_disk(sdkp);
3084
3085         /*
3086          * Without media there is no reason to ask; moreover, some devices
3087          * react badly if we do.
3088          */
3089         if (sdkp->media_present) {
3090                 sd_read_capacity(sdkp, buffer);
3091
3092                 if (scsi_device_supports_vpd(sdp)) {
3093                         sd_read_block_provisioning(sdkp);
3094                         sd_read_block_limits(sdkp);
3095                         sd_read_block_characteristics(sdkp);
3096                         sd_zbc_read_zones(sdkp, buffer);
3097                 }
3098
3099                 sd_print_capacity(sdkp, old_capacity);
3100
3101                 sd_read_write_protect_flag(sdkp, buffer);
3102                 sd_read_cache_type(sdkp, buffer);
3103                 sd_read_app_tag_own(sdkp, buffer);
3104                 sd_read_write_same(sdkp, buffer);
3105                 sd_read_security(sdkp, buffer);
3106         }
3107
3108         /*
3109          * We now have all cache related info, determine how we deal
3110          * with flush requests.
3111          */
3112         sd_set_flush_flag(sdkp);
3113
3114         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3115         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3116
3117         /* Some devices report a maximum block count for READ/WRITE requests. */
3118         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3119         q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3120
3121         /*
3122          * Determine the device's preferred I/O size for reads and writes
3123          * unless the reported value is unreasonably small, large, or
3124          * garbage.
3125          */
3126         if (sdkp->opt_xfer_blocks &&
3127             sdkp->opt_xfer_blocks <= dev_max &&
3128             sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
3129             logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
3130                 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3131                 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3132         } else
3133                 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3134                                       (sector_t)BLK_DEF_MAX_SECTORS);
3135
3136         /* Do not exceed controller limit */
3137         rw_max = min(rw_max, queue_max_hw_sectors(q));
3138
3139         /*
3140          * Only update max_sectors if previously unset or if the current value
3141          * exceeds the capabilities of the hardware.
3142          */
3143         if (sdkp->first_scan ||
3144             q->limits.max_sectors > q->limits.max_dev_sectors ||
3145             q->limits.max_sectors > q->limits.max_hw_sectors)
3146                 q->limits.max_sectors = rw_max;
3147
3148         sdkp->first_scan = 0;
3149
3150         set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3151         sd_config_write_same(sdkp);
3152         kfree(buffer);
3153
3154  out:
3155         return 0;
3156 }
3157
3158 /**
3159  *      sd_unlock_native_capacity - unlock native capacity
3160  *      @disk: struct gendisk to set capacity for
3161  *
3162  *      Block layer calls this function if it detects that partitions
3163  *      on @disk reach beyond the end of the device.  If the SCSI host
3164  *      implements ->unlock_native_capacity() method, it's invoked to
3165  *      give it a chance to adjust the device capacity.
3166  *
3167  *      CONTEXT:
3168  *      Defined by block layer.  Might sleep.
3169  */
3170 static void sd_unlock_native_capacity(struct gendisk *disk)
3171 {
3172         struct scsi_device *sdev = scsi_disk(disk)->device;
3173
3174         if (sdev->host->hostt->unlock_native_capacity)
3175                 sdev->host->hostt->unlock_native_capacity(sdev);
3176 }
3177
3178 /**
3179  *      sd_format_disk_name - format disk name
3180  *      @prefix: name prefix - ie. "sd" for SCSI disks
3181  *      @index: index of the disk to format name for
3182  *      @buf: output buffer
3183  *      @buflen: length of the output buffer
3184  *
3185  *      SCSI disk names starts at sda.  The 26th device is sdz and the
3186  *      27th is sdaa.  The last one for two lettered suffix is sdzz
3187  *      which is followed by sdaaa.
3188  *
3189  *      This is basically 26 base counting with one extra 'nil' entry
3190  *      at the beginning from the second digit on and can be
3191  *      determined using similar method as 26 base conversion with the
3192  *      index shifted -1 after each digit is computed.
3193  *
3194  *      CONTEXT:
3195  *      Don't care.
3196  *
3197  *      RETURNS:
3198  *      0 on success, -errno on failure.
3199  */
3200 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3201 {
3202         const int base = 'z' - 'a' + 1;
3203         char *begin = buf + strlen(prefix);
3204         char *end = buf + buflen;
3205         char *p;
3206         int unit;
3207
3208         p = end - 1;
3209         *p = '\0';
3210         unit = base;
3211         do {
3212                 if (p == begin)
3213                         return -EINVAL;
3214                 *--p = 'a' + (index % unit);
3215                 index = (index / unit) - 1;
3216         } while (index >= 0);
3217
3218         memmove(begin, p, end - p);
3219         memcpy(buf, prefix, strlen(prefix));
3220
3221         return 0;
3222 }
3223
3224 /*
3225  * The asynchronous part of sd_probe
3226  */
3227 static void sd_probe_async(void *data, async_cookie_t cookie)
3228 {
3229         struct scsi_disk *sdkp = data;
3230         struct scsi_device *sdp;
3231         struct gendisk *gd;
3232         u32 index;
3233         struct device *dev;
3234
3235         sdp = sdkp->device;
3236         gd = sdkp->disk;
3237         index = sdkp->index;
3238         dev = &sdp->sdev_gendev;
3239
3240         gd->major = sd_major((index & 0xf0) >> 4);
3241         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3242
3243         gd->fops = &sd_fops;
3244         gd->private_data = &sdkp->driver;
3245         gd->queue = sdkp->device->request_queue;
3246
3247         /* defaults, until the device tells us otherwise */
3248         sdp->sector_size = 512;
3249         sdkp->capacity = 0;
3250         sdkp->media_present = 1;
3251         sdkp->write_prot = 0;
3252         sdkp->cache_override = 0;
3253         sdkp->WCE = 0;
3254         sdkp->RCD = 0;
3255         sdkp->ATO = 0;
3256         sdkp->first_scan = 1;
3257         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3258
3259         sd_revalidate_disk(gd);
3260
3261         gd->flags = GENHD_FL_EXT_DEVT;
3262         if (sdp->removable) {
3263                 gd->flags |= GENHD_FL_REMOVABLE;
3264                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3265         }
3266
3267         blk_pm_runtime_init(sdp->request_queue, dev);
3268         device_add_disk(dev, gd, NULL);
3269         if (sdkp->capacity)
3270                 sd_dif_config_host(sdkp);
3271
3272         sd_revalidate_disk(gd);
3273
3274         if (sdkp->security) {
3275                 sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit);
3276                 if (sdkp->opal_dev)
3277                         sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
3278         }
3279
3280         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3281                   sdp->removable ? "removable " : "");
3282         scsi_autopm_put_device(sdp);
3283         put_device(&sdkp->dev);
3284 }
3285
3286 /**
3287  *      sd_probe - called during driver initialization and whenever a
3288  *      new scsi device is attached to the system. It is called once
3289  *      for each scsi device (not just disks) present.
3290  *      @dev: pointer to device object
3291  *
3292  *      Returns 0 if successful (or not interested in this scsi device
3293  *      (e.g. scanner)); 1 when there is an error.
3294  *
3295  *      Note: this function is invoked from the scsi mid-level.
3296  *      This function sets up the mapping between a given
3297  *      <host,channel,id,lun> (found in sdp) and new device name
3298  *      (e.g. /dev/sda). More precisely it is the block device major
3299  *      and minor number that is chosen here.
3300  *
3301  *      Assume sd_probe is not re-entrant (for time being)
3302  *      Also think about sd_probe() and sd_remove() running coincidentally.
3303  **/
3304 static int sd_probe(struct device *dev)
3305 {
3306         struct scsi_device *sdp = to_scsi_device(dev);
3307         struct scsi_disk *sdkp;
3308         struct gendisk *gd;
3309         int index;
3310         int error;
3311
3312         scsi_autopm_get_device(sdp);
3313         error = -ENODEV;
3314         if (sdp->type != TYPE_DISK &&
3315             sdp->type != TYPE_ZBC &&
3316             sdp->type != TYPE_MOD &&
3317             sdp->type != TYPE_RBC)
3318                 goto out;
3319
3320 #ifndef CONFIG_BLK_DEV_ZONED
3321         if (sdp->type == TYPE_ZBC)
3322                 goto out;
3323 #endif
3324         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3325                                         "sd_probe\n"));
3326
3327         error = -ENOMEM;
3328         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3329         if (!sdkp)
3330                 goto out;
3331
3332         gd = alloc_disk(SD_MINORS);
3333         if (!gd)
3334                 goto out_free;
3335
3336         index = ida_alloc(&sd_index_ida, GFP_KERNEL);
3337         if (index < 0) {
3338                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3339                 goto out_put;
3340         }
3341
3342         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3343         if (error) {
3344                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3345                 goto out_free_index;
3346         }
3347
3348         sdkp->device = sdp;
3349         sdkp->driver = &sd_template;
3350         sdkp->disk = gd;
3351         sdkp->index = index;
3352         atomic_set(&sdkp->openers, 0);
3353         atomic_set(&sdkp->device->ioerr_cnt, 0);
3354
3355         if (!sdp->request_queue->rq_timeout) {
3356                 if (sdp->type != TYPE_MOD)
3357                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3358                 else
3359                         blk_queue_rq_timeout(sdp->request_queue,
3360                                              SD_MOD_TIMEOUT);
3361         }
3362
3363         device_initialize(&sdkp->dev);
3364         sdkp->dev.parent = dev;
3365         sdkp->dev.class = &sd_disk_class;
3366         dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3367
3368         error = device_add(&sdkp->dev);
3369         if (error)
3370                 goto out_free_index;
3371
3372         get_device(dev);
3373         dev_set_drvdata(dev, sdkp);
3374
3375         get_device(&sdkp->dev); /* prevent release before async_schedule */
3376         async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3377
3378         return 0;
3379
3380  out_free_index:
3381         ida_free(&sd_index_ida, index);
3382  out_put:
3383         put_disk(gd);
3384  out_free:
3385         kfree(sdkp);
3386  out:
3387         scsi_autopm_put_device(sdp);
3388         return error;
3389 }
3390
3391 /**
3392  *      sd_remove - called whenever a scsi disk (previously recognized by
3393  *      sd_probe) is detached from the system. It is called (potentially
3394  *      multiple times) during sd module unload.
3395  *      @dev: pointer to device object
3396  *
3397  *      Note: this function is invoked from the scsi mid-level.
3398  *      This function potentially frees up a device name (e.g. /dev/sdc)
3399  *      that could be re-used by a subsequent sd_probe().
3400  *      This function is not called when the built-in sd driver is "exit-ed".
3401  **/
3402 static int sd_remove(struct device *dev)
3403 {
3404         struct scsi_disk *sdkp;
3405         dev_t devt;
3406
3407         sdkp = dev_get_drvdata(dev);
3408         devt = disk_devt(sdkp->disk);
3409         scsi_autopm_get_device(sdkp->device);
3410
3411         async_synchronize_full_domain(&scsi_sd_pm_domain);
3412         async_synchronize_full_domain(&scsi_sd_probe_domain);
3413         device_del(&sdkp->dev);
3414         del_gendisk(sdkp->disk);
3415         sd_shutdown(dev);
3416
3417         free_opal_dev(sdkp->opal_dev);
3418
3419         blk_register_region(devt, SD_MINORS, NULL,
3420                             sd_default_probe, NULL, NULL);
3421
3422         mutex_lock(&sd_ref_mutex);
3423         dev_set_drvdata(dev, NULL);
3424         put_device(&sdkp->dev);
3425         mutex_unlock(&sd_ref_mutex);
3426
3427         return 0;
3428 }
3429
3430 /**
3431  *      scsi_disk_release - Called to free the scsi_disk structure
3432  *      @dev: pointer to embedded class device
3433  *
3434  *      sd_ref_mutex must be held entering this routine.  Because it is
3435  *      called on last put, you should always use the scsi_disk_get()
3436  *      scsi_disk_put() helpers which manipulate the semaphore directly
3437  *      and never do a direct put_device.
3438  **/
3439 static void scsi_disk_release(struct device *dev)
3440 {
3441         struct scsi_disk *sdkp = to_scsi_disk(dev);
3442         struct gendisk *disk = sdkp->disk;
3443
3444         ida_free(&sd_index_ida, sdkp->index);
3445
3446         disk->private_data = NULL;
3447         put_disk(disk);
3448         put_device(&sdkp->device->sdev_gendev);
3449
3450         kfree(sdkp);
3451 }
3452
3453 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3454 {
3455         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3456         struct scsi_sense_hdr sshdr;
3457         struct scsi_device *sdp = sdkp->device;
3458         int res;
3459
3460         if (start)
3461                 cmd[4] |= 1;    /* START */
3462
3463         if (sdp->start_stop_pwr_cond)
3464                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3465
3466         if (!scsi_device_online(sdp))
3467                 return -ENODEV;
3468
3469         res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3470                         SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
3471         if (res) {
3472                 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3473                 if (driver_byte(res) == DRIVER_SENSE)
3474                         sd_print_sense_hdr(sdkp, &sshdr);
3475                 if (scsi_sense_valid(&sshdr) &&
3476                         /* 0x3a is medium not present */
3477                         sshdr.asc == 0x3a)
3478                         res = 0;
3479         }
3480
3481         /* SCSI error codes must not go to the generic layer */
3482         if (res)
3483                 return -EIO;
3484
3485         return 0;
3486 }
3487
3488 /*
3489  * Send a SYNCHRONIZE CACHE instruction down to the device through
3490  * the normal SCSI command structure.  Wait for the command to
3491  * complete.
3492  */
3493 static void sd_shutdown(struct device *dev)
3494 {
3495         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3496
3497         if (!sdkp)
3498                 return;         /* this can happen */
3499
3500         if (pm_runtime_suspended(dev))
3501                 return;
3502
3503         if (sdkp->WCE && sdkp->media_present) {
3504                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3505                 sd_sync_cache(sdkp, NULL);
3506         }
3507
3508         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3509                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3510                 sd_start_stop_device(sdkp, 0);
3511         }
3512 }
3513
3514 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3515 {
3516         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3517         struct scsi_sense_hdr sshdr;
3518         int ret = 0;
3519
3520         if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
3521                 return 0;
3522
3523         if (sdkp->WCE && sdkp->media_present) {
3524                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3525                 ret = sd_sync_cache(sdkp, &sshdr);
3526
3527                 if (ret) {
3528                         /* ignore OFFLINE device */
3529                         if (ret == -ENODEV)
3530                                 return 0;
3531
3532                         if (!scsi_sense_valid(&sshdr) ||
3533                             sshdr.sense_key != ILLEGAL_REQUEST)
3534                                 return ret;
3535
3536                         /*
3537                          * sshdr.sense_key == ILLEGAL_REQUEST means this drive
3538                          * doesn't support sync. There's not much to do and
3539                          * suspend shouldn't fail.
3540                          */
3541                         ret = 0;
3542                 }
3543         }
3544
3545         if (sdkp->device->manage_start_stop) {
3546                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3547                 /* an error is not worth aborting a system sleep */
3548                 ret = sd_start_stop_device(sdkp, 0);
3549                 if (ignore_stop_errors)
3550                         ret = 0;
3551         }
3552
3553         return ret;
3554 }
3555
3556 static int sd_suspend_system(struct device *dev)
3557 {
3558         return sd_suspend_common(dev, true);
3559 }
3560
3561 static int sd_suspend_runtime(struct device *dev)
3562 {
3563         return sd_suspend_common(dev, false);
3564 }
3565
3566 static int sd_resume(struct device *dev)
3567 {
3568         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3569         int ret;
3570
3571         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
3572                 return 0;
3573
3574         if (!sdkp->device->manage_start_stop)
3575                 return 0;
3576
3577         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3578         ret = sd_start_stop_device(sdkp, 1);
3579         if (!ret)
3580                 opal_unlock_from_suspend(sdkp->opal_dev);
3581         return ret;
3582 }
3583
3584 /**
3585  *      init_sd - entry point for this driver (both when built in or when
3586  *      a module).
3587  *
3588  *      Note: this function registers this driver with the scsi mid-level.
3589  **/
3590 static int __init init_sd(void)
3591 {
3592         int majors = 0, i, err;
3593
3594         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3595
3596         for (i = 0; i < SD_MAJORS; i++) {
3597                 if (register_blkdev(sd_major(i), "sd") != 0)
3598                         continue;
3599                 majors++;
3600                 blk_register_region(sd_major(i), SD_MINORS, NULL,
3601                                     sd_default_probe, NULL, NULL);
3602         }
3603
3604         if (!majors)
3605                 return -ENODEV;
3606
3607         err = class_register(&sd_disk_class);
3608         if (err)
3609                 goto err_out;
3610
3611         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3612                                          0, 0, NULL);
3613         if (!sd_cdb_cache) {
3614                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3615                 err = -ENOMEM;
3616                 goto err_out_class;
3617         }
3618
3619         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3620         if (!sd_cdb_pool) {
3621                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3622                 err = -ENOMEM;
3623                 goto err_out_cache;
3624         }
3625
3626         err = scsi_register_driver(&sd_template.gendrv);
3627         if (err)
3628                 goto err_out_driver;
3629
3630         return 0;
3631
3632 err_out_driver:
3633         mempool_destroy(sd_cdb_pool);
3634
3635 err_out_cache:
3636         kmem_cache_destroy(sd_cdb_cache);
3637
3638 err_out_class:
3639         class_unregister(&sd_disk_class);
3640 err_out:
3641         for (i = 0; i < SD_MAJORS; i++)
3642                 unregister_blkdev(sd_major(i), "sd");
3643         return err;
3644 }
3645
3646 /**
3647  *      exit_sd - exit point for this driver (when it is a module).
3648  *
3649  *      Note: this function unregisters this driver from the scsi mid-level.
3650  **/
3651 static void __exit exit_sd(void)
3652 {
3653         int i;
3654
3655         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3656
3657         scsi_unregister_driver(&sd_template.gendrv);
3658         mempool_destroy(sd_cdb_pool);
3659         kmem_cache_destroy(sd_cdb_cache);
3660
3661         class_unregister(&sd_disk_class);
3662
3663         for (i = 0; i < SD_MAJORS; i++) {
3664                 blk_unregister_region(sd_major(i), SD_MINORS);
3665                 unregister_blkdev(sd_major(i), "sd");
3666         }
3667 }
3668
3669 module_init(init_sd);
3670 module_exit(exit_sd);
3671
3672 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3673                                struct scsi_sense_hdr *sshdr)
3674 {
3675         scsi_print_sense_hdr(sdkp->device,
3676                              sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3677 }
3678
3679 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3680                             int result)
3681 {
3682         const char *hb_string = scsi_hostbyte_string(result);
3683         const char *db_string = scsi_driverbyte_string(result);
3684
3685         if (hb_string || db_string)
3686                 sd_printk(KERN_INFO, sdkp,
3687                           "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3688                           hb_string ? hb_string : "invalid",
3689                           db_string ? db_string : "invalid");
3690         else
3691                 sd_printk(KERN_INFO, sdkp,
3692                           "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3693                           msg, host_byte(result), driver_byte(result));
3694 }
3695