drivers/scsi/sd.c

   1 /*
   2  *      sd.c Copyright (C) 1992 Drew Eckhardt
   3  *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   4  *
   5  *      Linux scsi disk driver
   6  *              Initial versions: Drew Eckhardt
   7  *              Subsequent revisions: Eric Youngdale
   8  *      Modification history:
   9  *       - Drew Eckhardt <drew@colorado.edu> original
  10  *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
  11  *         outstanding request, and other enhancements.
  12  *         Support loadable low-level scsi drivers.
  13  *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
  14  *         eight major numbers.
  15  *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
  16  *       - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
  17  *         sd_init and cleanups.
  18  *       - Alex Davis <letmein@erols.com> Fix problem where partition info
  19  *         not being read in sd_open. Fix problem where removable media
  20  *         could be ejected after sd_open.
  21  *       - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
  22  *       - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
  23  *         <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
  24  *         Support 32k/1M disks.
  25  *
  26  *      Logging policy (needs CONFIG_SCSI_LOGGING defined):
  27  *       - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  28  *       - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  29  *       - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  30  *       - entering other commands: SCSI_LOG_HLQUEUE level 3
  31  *      Note: when the logging level is set by the user, it must be greater
  32  *      than the level indicated above to trigger output.
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/fs.h>
  37 #include <linux/kernel.h>
  38 #include <linux/mm.h>
  39 #include <linux/bio.h>
  40 #include <linux/genhd.h>
  41 #include <linux/hdreg.h>
  42 #include <linux/errno.h>
  43 #include <linux/idr.h>
  44 #include <linux/interrupt.h>
  45 #include <linux/init.h>
  46 #include <linux/blkdev.h>
  47 #include <linux/blkpg.h>
  48 #include <linux/delay.h>
  49 #include <linux/mutex.h>
  50 #include <linux/string_helpers.h>
  51 #include <linux/async.h>
  52 #include <linux/slab.h>
  53 #include <linux/sed-opal.h>
  54 #include <linux/pm_runtime.h>
  55 #include <linux/pr.h>
  56 #include <linux/t10-pi.h>
  57 #include <linux/uaccess.h>
  58 #include <asm/unaligned.h>
  59
  60 #include <scsi/scsi.h>
  61 #include <scsi/scsi_cmnd.h>
  62 #include <scsi/scsi_dbg.h>
  63 #include <scsi/scsi_device.h>
  64 #include <scsi/scsi_driver.h>
  65 #include <scsi/scsi_eh.h>
  66 #include <scsi/scsi_host.h>
  67 #include <scsi/scsi_ioctl.h>
  68 #include <scsi/scsicam.h>
  69
  70 #include "sd.h"
  71 #include "scsi_priv.h"
  72 #include "scsi_logging.h"
  73
  74 MODULE_AUTHOR("Eric Youngdale");
  75 MODULE_DESCRIPTION("SCSI disk (sd) driver");
  76 MODULE_LICENSE("GPL");
  77
  78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  94 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  95 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  96 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  97 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
  98
  99 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
 100 #define SD_MINORS       16
 101 #else
 102 #define SD_MINORS       0
 103 #endif
 104
 105 static void sd_config_discard(struct scsi_disk *, unsigned int);
 106 static void sd_config_write_same(struct scsi_disk *);
 107 static int  sd_revalidate_disk(struct gendisk *);
 108 static void sd_unlock_native_capacity(struct gendisk *disk);
 109 static int  sd_probe(struct device *);
 110 static int  sd_remove(struct device *);
 111 static void sd_shutdown(struct device *);
 112 static int sd_suspend_system(struct device *);
 113 static int sd_suspend_runtime(struct device *);
 114 static int sd_resume(struct device *);
 115 static void sd_rescan(struct device *);
 116 static int sd_init_command(struct scsi_cmnd *SCpnt);
 117 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 118 static int sd_done(struct scsi_cmnd *);
 119 static void sd_eh_reset(struct scsi_cmnd *);
 120 static int sd_eh_action(struct scsi_cmnd *, int);
 121 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 122 static void scsi_disk_release(struct device *cdev);
 123 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 124 static void sd_print_result(const struct scsi_disk *, const char *, int);
 125
 126 static DEFINE_SPINLOCK(sd_index_lock);
 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                 queue_flag_clear_unlocked(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         queue_flag_set_unlocked(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         int ret;
 855
 856         if (!(rq->cmd_flags & REQ_NOUNMAP)) {
 857                 switch (sdkp->zeroing_mode) {
 858                 case SD_ZERO_WS16_UNMAP:
 859                         ret = sd_setup_write_same16_cmnd(cmd, true);
 860                         goto out;
 861                 case SD_ZERO_WS10_UNMAP:
 862                         ret = sd_setup_write_same10_cmnd(cmd, true);
 863                         goto out;
 864                 }
 865         }
 866
 867         if (sdp->no_write_same)
 868                 return BLKPREP_INVALID;
 869
 870         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
 871                 ret = sd_setup_write_same16_cmnd(cmd, false);
 872         else
 873                 ret = sd_setup_write_same10_cmnd(cmd, false);
 874
 875 out:
 876         if (sd_is_zoned(sdkp) && ret == BLKPREP_OK)
 877                 return sd_zbc_write_lock_zone(cmd);
 878
 879         return ret;
 880 }
 881
 882 static void sd_config_write_same(struct scsi_disk *sdkp)
 883 {
 884         struct request_queue *q = sdkp->disk->queue;
 885         unsigned int logical_block_size = sdkp->device->sector_size;
 886
 887         if (sdkp->device->no_write_same) {
 888                 sdkp->max_ws_blocks = 0;
 889                 goto out;
 890         }
 891
 892         /* Some devices can not handle block counts above 0xffff despite
 893          * supporting WRITE SAME(16). Consequently we default to 64k
 894          * blocks per I/O unless the device explicitly advertises a
 895          * bigger limit.
 896          */
 897         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 898                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 899                                                    (u32)SD_MAX_WS16_BLOCKS);
 900         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 901                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 902                                                    (u32)SD_MAX_WS10_BLOCKS);
 903         else {
 904                 sdkp->device->no_write_same = 1;
 905                 sdkp->max_ws_blocks = 0;
 906         }
 907
 908         if (sdkp->lbprz && sdkp->lbpws)
 909                 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
 910         else if (sdkp->lbprz && sdkp->lbpws10)
 911                 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
 912         else if (sdkp->max_ws_blocks)
 913                 sdkp->zeroing_mode = SD_ZERO_WS;
 914         else
 915                 sdkp->zeroing_mode = SD_ZERO_WRITE;
 916
 917 out:
 918         blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
 919                                          (logical_block_size >> 9));
 920         blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
 921                                          (logical_block_size >> 9));
 922 }
 923
 924 /**
 925  * sd_setup_write_same_cmnd - write the same data to multiple blocks
 926  * @cmd: command to prepare
 927  *
 928  * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
 929  * the preference indicated by the target device.
 930  **/
 931 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
 932 {
 933         struct request *rq = cmd->request;
 934         struct scsi_device *sdp = cmd->device;
 935         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 936         struct bio *bio = rq->bio;
 937         sector_t sector = blk_rq_pos(rq);
 938         unsigned int nr_sectors = blk_rq_sectors(rq);
 939         unsigned int nr_bytes = blk_rq_bytes(rq);
 940         int ret;
 941
 942         if (sdkp->device->no_write_same)
 943                 return BLKPREP_INVALID;
 944
 945         BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
 946
 947         if (sd_is_zoned(sdkp)) {
 948                 ret = sd_zbc_write_lock_zone(cmd);
 949                 if (ret != BLKPREP_OK)
 950                         return ret;
 951         }
 952
 953         sector >>= ilog2(sdp->sector_size) - 9;
 954         nr_sectors >>= ilog2(sdp->sector_size) - 9;
 955
 956         rq->timeout = SD_WRITE_SAME_TIMEOUT;
 957
 958         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
 959                 cmd->cmd_len = 16;
 960                 cmd->cmnd[0] = WRITE_SAME_16;
 961                 put_unaligned_be64(sector, &cmd->cmnd[2]);
 962                 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
 963         } else {
 964                 cmd->cmd_len = 10;
 965                 cmd->cmnd[0] = WRITE_SAME;
 966                 put_unaligned_be32(sector, &cmd->cmnd[2]);
 967                 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
 968         }
 969
 970         cmd->transfersize = sdp->sector_size;
 971         cmd->allowed = SD_MAX_RETRIES;
 972
 973         /*
 974          * For WRITE SAME the data transferred via the DATA OUT buffer is
 975          * different from the amount of data actually written to the target.
 976          *
 977          * We set up __data_len to the amount of data transferred via the
 978          * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
 979          * to transfer a single sector of data first, but then reset it to
 980          * the amount of data to be written right after so that the I/O path
 981          * knows how much to actually write.
 982          */
 983         rq->__data_len = sdp->sector_size;
 984         ret = scsi_init_io(cmd);
 985         rq->__data_len = nr_bytes;
 986
 987         if (sd_is_zoned(sdkp) && ret != BLKPREP_OK)
 988                 sd_zbc_write_unlock_zone(cmd);
 989
 990         return ret;
 991 }
 992
 993 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
 994 {
 995         struct request *rq = cmd->request;
 996
 997         /* flush requests don't perform I/O, zero the S/G table */
 998         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
 999
1000         cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1001         cmd->cmd_len = 10;
1002         cmd->transfersize = 0;
1003         cmd->allowed = SD_MAX_RETRIES;
1004
1005         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1006         return BLKPREP_OK;
1007 }
1008
1009 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
1010 {
1011         struct request *rq = SCpnt->request;
1012         struct scsi_device *sdp = SCpnt->device;
1013         struct gendisk *disk = rq->rq_disk;
1014         struct scsi_disk *sdkp = scsi_disk(disk);
1015         sector_t block = blk_rq_pos(rq);
1016         sector_t threshold;
1017         unsigned int this_count = blk_rq_sectors(rq);
1018         unsigned int dif, dix;
1019         bool zoned_write = sd_is_zoned(sdkp) && rq_data_dir(rq) == WRITE;
1020         int ret;
1021         unsigned char protect;
1022
1023         if (zoned_write) {
1024                 ret = sd_zbc_write_lock_zone(SCpnt);
1025                 if (ret != BLKPREP_OK)
1026                         return ret;
1027         }
1028
1029         ret = scsi_init_io(SCpnt);
1030         if (ret != BLKPREP_OK)
1031                 goto out;
1032         WARN_ON_ONCE(SCpnt != rq->special);
1033
1034         /* from here on until we're complete, any goto out
1035          * is used for a killable error condition */
1036         ret = BLKPREP_KILL;
1037
1038         SCSI_LOG_HLQUEUE(1,
1039                 scmd_printk(KERN_INFO, SCpnt,
1040                         "%s: block=%llu, count=%d\n",
1041                         __func__, (unsigned long long)block, this_count));
1042
1043         if (!sdp || !scsi_device_online(sdp) ||
1044             block + blk_rq_sectors(rq) > get_capacity(disk)) {
1045                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1046                                                 "Finishing %u sectors\n",
1047                                                 blk_rq_sectors(rq)));
1048                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1049                                                 "Retry with 0x%p\n", SCpnt));
1050                 goto out;
1051         }
1052
1053         if (sdp->changed) {
1054                 /*
1055                  * quietly refuse to do anything to a changed disc until
1056                  * the changed bit has been reset
1057                  */
1058                 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
1059                 goto out;
1060         }
1061
1062         /*
1063          * Some SD card readers can't handle multi-sector accesses which touch
1064          * the last one or two hardware sectors.  Split accesses as needed.
1065          */
1066         threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
1067                 (sdp->sector_size / 512);
1068
1069         if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
1070                 if (block < threshold) {
1071                         /* Access up to the threshold but not beyond */
1072                         this_count = threshold - block;
1073                 } else {
1074                         /* Access only a single hardware sector */
1075                         this_count = sdp->sector_size / 512;
1076                 }
1077         }
1078
1079         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
1080                                         (unsigned long long)block));
1081
1082         /*
1083          * If we have a 1K hardware sectorsize, prevent access to single
1084          * 512 byte sectors.  In theory we could handle this - in fact
1085          * the scsi cdrom driver must be able to handle this because
1086          * we typically use 1K blocksizes, and cdroms typically have
1087          * 2K hardware sectorsizes.  Of course, things are simpler
1088          * with the cdrom, since it is read-only.  For performance
1089          * reasons, the filesystems should be able to handle this
1090          * and not force the scsi disk driver to use bounce buffers
1091          * for this.
1092          */
1093         if (sdp->sector_size == 1024) {
1094                 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
1095                         scmd_printk(KERN_ERR, SCpnt,
1096                                     "Bad block number requested\n");
1097                         goto out;
1098                 } else {
1099                         block = block >> 1;
1100                         this_count = this_count >> 1;
1101                 }
1102         }
1103         if (sdp->sector_size == 2048) {
1104                 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
1105                         scmd_printk(KERN_ERR, SCpnt,
1106                                     "Bad block number requested\n");
1107                         goto out;
1108                 } else {
1109                         block = block >> 2;
1110                         this_count = this_count >> 2;
1111                 }
1112         }
1113         if (sdp->sector_size == 4096) {
1114                 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
1115                         scmd_printk(KERN_ERR, SCpnt,
1116                                     "Bad block number requested\n");
1117                         goto out;
1118                 } else {
1119                         block = block >> 3;
1120                         this_count = this_count >> 3;
1121                 }
1122         }
1123         if (rq_data_dir(rq) == WRITE) {
1124                 SCpnt->cmnd[0] = WRITE_6;
1125
1126                 if (blk_integrity_rq(rq))
1127                         sd_dif_prepare(SCpnt);
1128
1129         } else if (rq_data_dir(rq) == READ) {
1130                 SCpnt->cmnd[0] = READ_6;
1131         } else {
1132                 scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq));
1133                 goto out;
1134         }
1135
1136         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1137                                         "%s %d/%u 512 byte blocks.\n",
1138                                         (rq_data_dir(rq) == WRITE) ?
1139                                         "writing" : "reading", this_count,
1140                                         blk_rq_sectors(rq)));
1141
1142         dix = scsi_prot_sg_count(SCpnt);
1143         dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1144
1145         if (dif || dix)
1146                 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1147         else
1148                 protect = 0;
1149
1150         if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1151                 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1152
1153                 if (unlikely(SCpnt->cmnd == NULL)) {
1154                         ret = BLKPREP_DEFER;
1155                         goto out;
1156                 }
1157
1158                 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1159                 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1160                 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1161                 SCpnt->cmnd[7] = 0x18;
1162                 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1163                 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1164
1165                 /* LBA */
1166                 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1167                 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1168                 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1169                 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1170                 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1171                 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1172                 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1173                 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1174
1175                 /* Expected Indirect LBA */
1176                 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1177                 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1178                 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1179                 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1180
1181                 /* Transfer length */
1182                 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1183                 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1184                 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1185                 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1186         } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1187                 SCpnt->cmnd[0] += READ_16 - READ_6;
1188                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1189                 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1190                 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1191                 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1192                 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1193                 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1194                 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1195                 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1196                 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1197                 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1198                 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1199                 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1200                 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1201                 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1202         } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1203                    scsi_device_protection(SCpnt->device) ||
1204                    SCpnt->device->use_10_for_rw) {
1205                 SCpnt->cmnd[0] += READ_10 - READ_6;
1206                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1207                 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1208                 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1209                 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1210                 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1211                 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1212                 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1213                 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1214         } else {
1215                 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1216                         /*
1217                          * This happens only if this drive failed
1218                          * 10byte rw command with ILLEGAL_REQUEST
1219                          * during operation and thus turned off
1220                          * use_10_for_rw.
1221                          */
1222                         scmd_printk(KERN_ERR, SCpnt,
1223                                     "FUA write on READ/WRITE(6) drive\n");
1224                         goto out;
1225                 }
1226
1227                 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1228                 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1229                 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1230                 SCpnt->cmnd[4] = (unsigned char) this_count;
1231                 SCpnt->cmnd[5] = 0;
1232         }
1233         SCpnt->sdb.length = this_count * sdp->sector_size;
1234
1235         /*
1236          * We shouldn't disconnect in the middle of a sector, so with a dumb
1237          * host adapter, it's safe to assume that we can at least transfer
1238          * this many bytes between each connect / disconnect.
1239          */
1240         SCpnt->transfersize = sdp->sector_size;
1241         SCpnt->underflow = this_count << 9;
1242         SCpnt->allowed = SD_MAX_RETRIES;
1243
1244         /*
1245          * This indicates that the command is ready from our end to be
1246          * queued.
1247          */
1248         ret = BLKPREP_OK;
1249  out:
1250         if (zoned_write && ret != BLKPREP_OK)
1251                 sd_zbc_write_unlock_zone(SCpnt);
1252
1253         return ret;
1254 }
1255
1256 static int sd_init_command(struct scsi_cmnd *cmd)
1257 {
1258         struct request *rq = cmd->request;
1259
1260         switch (req_op(rq)) {
1261         case REQ_OP_DISCARD:
1262                 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1263                 case SD_LBP_UNMAP:
1264                         return sd_setup_unmap_cmnd(cmd);
1265                 case SD_LBP_WS16:
1266                         return sd_setup_write_same16_cmnd(cmd, true);
1267                 case SD_LBP_WS10:
1268                         return sd_setup_write_same10_cmnd(cmd, true);
1269                 case SD_LBP_ZERO:
1270                         return sd_setup_write_same10_cmnd(cmd, false);
1271                 default:
1272                         return BLKPREP_INVALID;
1273                 }
1274         case REQ_OP_WRITE_ZEROES:
1275                 return sd_setup_write_zeroes_cmnd(cmd);
1276         case REQ_OP_WRITE_SAME:
1277                 return sd_setup_write_same_cmnd(cmd);
1278         case REQ_OP_FLUSH:
1279                 return sd_setup_flush_cmnd(cmd);
1280         case REQ_OP_READ:
1281         case REQ_OP_WRITE:
1282                 return sd_setup_read_write_cmnd(cmd);
1283         case REQ_OP_ZONE_REPORT:
1284                 return sd_zbc_setup_report_cmnd(cmd);
1285         case REQ_OP_ZONE_RESET:
1286                 return sd_zbc_setup_reset_cmnd(cmd);
1287         default:
1288                 BUG();
1289         }
1290 }
1291
1292 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1293 {
1294         struct request *rq = SCpnt->request;
1295         u8 *cmnd;
1296
1297         if (SCpnt->flags & SCMD_ZONE_WRITE_LOCK)
1298                 sd_zbc_write_unlock_zone(SCpnt);
1299
1300         if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1301                 __free_page(rq->special_vec.bv_page);
1302
1303         if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1304                 cmnd = SCpnt->cmnd;
1305                 SCpnt->cmnd = NULL;
1306                 SCpnt->cmd_len = 0;
1307                 mempool_free(cmnd, sd_cdb_pool);
1308         }
1309 }
1310
1311 /**
1312  *      sd_open - open a scsi disk device
1313  *      @bdev: Block device of the scsi disk to open
1314  *      @mode: FMODE_* mask
1315  *
1316  *      Returns 0 if successful. Returns a negated errno value in case
1317  *      of error.
1318  *
1319  *      Note: This can be called from a user context (e.g. fsck(1) )
1320  *      or from within the kernel (e.g. as a result of a mount(1) ).
1321  *      In the latter case @inode and @filp carry an abridged amount
1322  *      of information as noted above.
1323  *
1324  *      Locking: called with bdev->bd_mutex held.
1325  **/
1326 static int sd_open(struct block_device *bdev, fmode_t mode)
1327 {
1328         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1329         struct scsi_device *sdev;
1330         int retval;
1331
1332         if (!sdkp)
1333                 return -ENXIO;
1334
1335         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1336
1337         sdev = sdkp->device;
1338
1339         /*
1340          * If the device is in error recovery, wait until it is done.
1341          * If the device is offline, then disallow any access to it.
1342          */
1343         retval = -ENXIO;
1344         if (!scsi_block_when_processing_errors(sdev))
1345                 goto error_out;
1346
1347         if (sdev->removable || sdkp->write_prot)
1348                 check_disk_change(bdev);
1349
1350         /*
1351          * If the drive is empty, just let the open fail.
1352          */
1353         retval = -ENOMEDIUM;
1354         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1355                 goto error_out;
1356
1357         /*
1358          * If the device has the write protect tab set, have the open fail
1359          * if the user expects to be able to write to the thing.
1360          */
1361         retval = -EROFS;
1362         if (sdkp->write_prot && (mode & FMODE_WRITE))
1363                 goto error_out;
1364
1365         /*
1366          * It is possible that the disk changing stuff resulted in
1367          * the device being taken offline.  If this is the case,
1368          * report this to the user, and don't pretend that the
1369          * open actually succeeded.
1370          */
1371         retval = -ENXIO;
1372         if (!scsi_device_online(sdev))
1373                 goto error_out;
1374
1375         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1376                 if (scsi_block_when_processing_errors(sdev))
1377                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1378         }
1379
1380         return 0;
1381
1382 error_out:
1383         scsi_disk_put(sdkp);
1384         return retval;
1385 }
1386
1387 /**
1388  *      sd_release - invoked when the (last) close(2) is called on this
1389  *      scsi disk.
1390  *      @disk: disk to release
1391  *      @mode: FMODE_* mask
1392  *
1393  *      Returns 0.
1394  *
1395  *      Note: may block (uninterruptible) if error recovery is underway
1396  *      on this disk.
1397  *
1398  *      Locking: called with bdev->bd_mutex held.
1399  **/
1400 static void sd_release(struct gendisk *disk, fmode_t mode)
1401 {
1402         struct scsi_disk *sdkp = scsi_disk(disk);
1403         struct scsi_device *sdev = sdkp->device;
1404
1405         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1406
1407         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1408                 if (scsi_block_when_processing_errors(sdev))
1409                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1410         }
1411
1412         /*
1413          * XXX and what if there are packets in flight and this close()
1414          * XXX is followed by a "rmmod sd_mod"?
1415          */
1416
1417         scsi_disk_put(sdkp);
1418 }
1419
1420 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1421 {
1422         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1423         struct scsi_device *sdp = sdkp->device;
1424         struct Scsi_Host *host = sdp->host;
1425         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1426         int diskinfo[4];
1427
1428         /* default to most commonly used values */
1429         diskinfo[0] = 0x40;     /* 1 << 6 */
1430         diskinfo[1] = 0x20;     /* 1 << 5 */
1431         diskinfo[2] = capacity >> 11;
1432
1433         /* override with calculated, extended default, or driver values */
1434         if (host->hostt->bios_param)
1435                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1436         else
1437                 scsicam_bios_param(bdev, capacity, diskinfo);
1438
1439         geo->heads = diskinfo[0];
1440         geo->sectors = diskinfo[1];
1441         geo->cylinders = diskinfo[2];
1442         return 0;
1443 }
1444
1445 /**
1446  *      sd_ioctl - process an ioctl
1447  *      @bdev: target block device
1448  *      @mode: FMODE_* mask
1449  *      @cmd: ioctl command number
1450  *      @arg: this is third argument given to ioctl(2) system call.
1451  *      Often contains a pointer.
1452  *
1453  *      Returns 0 if successful (some ioctls return positive numbers on
1454  *      success as well). Returns a negated errno value in case of error.
1455  *
1456  *      Note: most ioctls are forward onto the block subsystem or further
1457  *      down in the scsi subsystem.
1458  **/
1459 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1460                     unsigned int cmd, unsigned long arg)
1461 {
1462         struct gendisk *disk = bdev->bd_disk;
1463         struct scsi_disk *sdkp = scsi_disk(disk);
1464         struct scsi_device *sdp = sdkp->device;
1465         void __user *p = (void __user *)arg;
1466         int error;
1467
1468         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1469                                     "cmd=0x%x\n", disk->disk_name, cmd));
1470
1471         error = scsi_verify_blk_ioctl(bdev, cmd);
1472         if (error < 0)
1473                 return error;
1474
1475         /*
1476          * If we are in the middle of error recovery, don't let anyone
1477          * else try and use this device.  Also, if error recovery fails, it
1478          * may try and take the device offline, in which case all further
1479          * access to the device is prohibited.
1480          */
1481         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1482                         (mode & FMODE_NDELAY) != 0);
1483         if (error)
1484                 goto out;
1485
1486         if (is_sed_ioctl(cmd))
1487                 return sed_ioctl(sdkp->opal_dev, cmd, p);
1488
1489         /*
1490          * Send SCSI addressing ioctls directly to mid level, send other
1491          * ioctls to block level and then onto mid level if they can't be
1492          * resolved.
1493          */
1494         switch (cmd) {
1495                 case SCSI_IOCTL_GET_IDLUN:
1496                 case SCSI_IOCTL_GET_BUS_NUMBER:
1497                         error = scsi_ioctl(sdp, cmd, p);
1498                         break;
1499                 default:
1500                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1501                         if (error != -ENOTTY)
1502                                 break;
1503                         error = scsi_ioctl(sdp, cmd, p);
1504                         break;
1505         }
1506 out:
1507         return error;
1508 }
1509
1510 static void set_media_not_present(struct scsi_disk *sdkp)
1511 {
1512         if (sdkp->media_present)
1513                 sdkp->device->changed = 1;
1514
1515         if (sdkp->device->removable) {
1516                 sdkp->media_present = 0;
1517                 sdkp->capacity = 0;
1518         }
1519 }
1520
1521 static int media_not_present(struct scsi_disk *sdkp,
1522                              struct scsi_sense_hdr *sshdr)
1523 {
1524         if (!scsi_sense_valid(sshdr))
1525                 return 0;
1526
1527         /* not invoked for commands that could return deferred errors */
1528         switch (sshdr->sense_key) {
1529         case UNIT_ATTENTION:
1530         case NOT_READY:
1531                 /* medium not present */
1532                 if (sshdr->asc == 0x3A) {
1533                         set_media_not_present(sdkp);
1534                         return 1;
1535                 }
1536         }
1537         return 0;
1538 }
1539
1540 /**
1541  *      sd_check_events - check media events
1542  *      @disk: kernel device descriptor
1543  *      @clearing: disk events currently being cleared
1544  *
1545  *      Returns mask of DISK_EVENT_*.
1546  *
1547  *      Note: this function is invoked from the block subsystem.
1548  **/
1549 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1550 {
1551         struct scsi_disk *sdkp = scsi_disk_get(disk);
1552         struct scsi_device *sdp;
1553         int retval;
1554
1555         if (!sdkp)
1556                 return 0;
1557
1558         sdp = sdkp->device;
1559         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1560
1561         /*
1562          * If the device is offline, don't send any commands - just pretend as
1563          * if the command failed.  If the device ever comes back online, we
1564          * can deal with it then.  It is only because of unrecoverable errors
1565          * that we would ever take a device offline in the first place.
1566          */
1567         if (!scsi_device_online(sdp)) {
1568                 set_media_not_present(sdkp);
1569                 goto out;
1570         }
1571
1572         /*
1573          * Using TEST_UNIT_READY enables differentiation between drive with
1574          * no cartridge loaded - NOT READY, drive with changed cartridge -
1575          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1576          *
1577          * Drives that auto spin down. eg iomega jaz 1G, will be started
1578          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1579          * sd_revalidate() is called.
1580          */
1581         if (scsi_block_when_processing_errors(sdp)) {
1582                 struct scsi_sense_hdr sshdr = { 0, };
1583
1584                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1585                                               &sshdr);
1586
1587                 /* failed to execute TUR, assume media not present */
1588                 if (host_byte(retval)) {
1589                         set_media_not_present(sdkp);
1590                         goto out;
1591                 }
1592
1593                 if (media_not_present(sdkp, &sshdr))
1594                         goto out;
1595         }
1596
1597         /*
1598          * For removable scsi disk we have to recognise the presence
1599          * of a disk in the drive.
1600          */
1601         if (!sdkp->media_present)
1602                 sdp->changed = 1;
1603         sdkp->media_present = 1;
1604 out:
1605         /*
1606          * sdp->changed is set under the following conditions:
1607          *
1608          *      Medium present state has changed in either direction.
1609          *      Device has indicated UNIT_ATTENTION.
1610          */
1611         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1612         sdp->changed = 0;
1613         scsi_disk_put(sdkp);
1614         return retval;
1615 }
1616
1617 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1618 {
1619         int retries, res;
1620         struct scsi_device *sdp = sdkp->device;
1621         const int timeout = sdp->request_queue->rq_timeout
1622                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1623         struct scsi_sense_hdr my_sshdr;
1624
1625         if (!scsi_device_online(sdp))
1626                 return -ENODEV;
1627
1628         /* caller might not be interested in sense, but we need it */
1629         if (!sshdr)
1630                 sshdr = &my_sshdr;
1631
1632         for (retries = 3; retries > 0; --retries) {
1633                 unsigned char cmd[10] = { 0 };
1634
1635                 cmd[0] = SYNCHRONIZE_CACHE;
1636                 /*
1637                  * Leave the rest of the command zero to indicate
1638                  * flush everything.
1639                  */
1640                 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1641                                 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1642                 if (res == 0)
1643                         break;
1644         }
1645
1646         if (res) {
1647                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1648
1649                 if (driver_byte(res) & DRIVER_SENSE)
1650                         sd_print_sense_hdr(sdkp, sshdr);
1651
1652                 /* we need to evaluate the error return  */
1653                 if (scsi_sense_valid(sshdr) &&
1654                         (sshdr->asc == 0x3a ||  /* medium not present */
1655                          sshdr->asc == 0x20))   /* invalid command */
1656                                 /* this is no error here */
1657                                 return 0;
1658
1659                 switch (host_byte(res)) {
1660                 /* ignore errors due to racing a disconnection */
1661                 case DID_BAD_TARGET:
1662                 case DID_NO_CONNECT:
1663                         return 0;
1664                 /* signal the upper layer it might try again */
1665                 case DID_BUS_BUSY:
1666                 case DID_IMM_RETRY:
1667                 case DID_REQUEUE:
1668                 case DID_SOFT_ERROR:
1669                         return -EBUSY;
1670                 default:
1671                         return -EIO;
1672                 }
1673         }
1674         return 0;
1675 }
1676
1677 static void sd_rescan(struct device *dev)
1678 {
1679         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1680
1681         revalidate_disk(sdkp->disk);
1682 }
1683
1684
1685 #ifdef CONFIG_COMPAT
1686 /*
1687  * This gets directly called from VFS. When the ioctl
1688  * is not recognized we go back to the other translation paths.
1689  */
1690 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1691                            unsigned int cmd, unsigned long arg)
1692 {
1693         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1694         int error;
1695
1696         error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1697                         (mode & FMODE_NDELAY) != 0);
1698         if (error)
1699                 return error;
1700
1701         /*
1702          * Let the static ioctl translation table take care of it.
1703          */
1704         if (!sdev->host->hostt->compat_ioctl)
1705                 return -ENOIOCTLCMD;
1706         return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1707 }
1708 #endif
1709
1710 static char sd_pr_type(enum pr_type type)
1711 {
1712         switch (type) {
1713         case PR_WRITE_EXCLUSIVE:
1714                 return 0x01;
1715         case PR_EXCLUSIVE_ACCESS:
1716                 return 0x03;
1717         case PR_WRITE_EXCLUSIVE_REG_ONLY:
1718                 return 0x05;
1719         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1720                 return 0x06;
1721         case PR_WRITE_EXCLUSIVE_ALL_REGS:
1722                 return 0x07;
1723         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1724                 return 0x08;
1725         default:
1726                 return 0;
1727         }
1728 };
1729
1730 static int sd_pr_command(struct block_device *bdev, u8 sa,
1731                 u64 key, u64 sa_key, u8 type, u8 flags)
1732 {
1733         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1734         struct scsi_sense_hdr sshdr;
1735         int result;
1736         u8 cmd[16] = { 0, };
1737         u8 data[24] = { 0, };
1738
1739         cmd[0] = PERSISTENT_RESERVE_OUT;
1740         cmd[1] = sa;
1741         cmd[2] = type;
1742         put_unaligned_be32(sizeof(data), &cmd[5]);
1743
1744         put_unaligned_be64(key, &data[0]);
1745         put_unaligned_be64(sa_key, &data[8]);
1746         data[20] = flags;
1747
1748         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1749                         &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1750
1751         if ((driver_byte(result) & DRIVER_SENSE) &&
1752             (scsi_sense_valid(&sshdr))) {
1753                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1754                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1755         }
1756
1757         return result;
1758 }
1759
1760 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1761                 u32 flags)
1762 {
1763         if (flags & ~PR_FL_IGNORE_KEY)
1764                 return -EOPNOTSUPP;
1765         return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1766                         old_key, new_key, 0,
1767                         (1 << 0) /* APTPL */);
1768 }
1769
1770 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1771                 u32 flags)
1772 {
1773         if (flags)
1774                 return -EOPNOTSUPP;
1775         return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1776 }
1777
1778 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1779 {
1780         return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1781 }
1782
1783 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1784                 enum pr_type type, bool abort)
1785 {
1786         return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1787                              sd_pr_type(type), 0);
1788 }
1789
1790 static int sd_pr_clear(struct block_device *bdev, u64 key)
1791 {
1792         return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1793 }
1794
1795 static const struct pr_ops sd_pr_ops = {
1796         .pr_register    = sd_pr_register,
1797         .pr_reserve     = sd_pr_reserve,
1798         .pr_release     = sd_pr_release,
1799         .pr_preempt     = sd_pr_preempt,
1800         .pr_clear       = sd_pr_clear,
1801 };
1802
1803 static const struct block_device_operations sd_fops = {
1804         .owner                  = THIS_MODULE,
1805         .open                   = sd_open,
1806         .release                = sd_release,
1807         .ioctl                  = sd_ioctl,
1808         .getgeo                 = sd_getgeo,
1809 #ifdef CONFIG_COMPAT
1810         .compat_ioctl           = sd_compat_ioctl,
1811 #endif
1812         .check_events           = sd_check_events,
1813         .revalidate_disk        = sd_revalidate_disk,
1814         .unlock_native_capacity = sd_unlock_native_capacity,
1815         .pr_ops                 = &sd_pr_ops,
1816 };
1817
1818 /**
1819  *      sd_eh_reset - reset error handling callback
1820  *      @scmd:          sd-issued command that has failed
1821  *
1822  *      This function is called by the SCSI midlayer before starting
1823  *      SCSI EH. When counting medium access failures we have to be
1824  *      careful to register it only only once per device and SCSI EH run;
1825  *      there might be several timed out commands which will cause the
1826  *      'max_medium_access_timeouts' counter to trigger after the first
1827  *      SCSI EH run already and set the device to offline.
1828  *      So this function resets the internal counter before starting SCSI EH.
1829  **/
1830 static void sd_eh_reset(struct scsi_cmnd *scmd)
1831 {
1832         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1833
1834         /* New SCSI EH run, reset gate variable */
1835         sdkp->ignore_medium_access_errors = false;
1836 }
1837
1838 /**
1839  *      sd_eh_action - error handling callback
1840  *      @scmd:          sd-issued command that has failed
1841  *      @eh_disp:       The recovery disposition suggested by the midlayer
1842  *
1843  *      This function is called by the SCSI midlayer upon completion of an
1844  *      error test command (currently TEST UNIT READY). The result of sending
1845  *      the eh command is passed in eh_disp.  We're looking for devices that
1846  *      fail medium access commands but are OK with non access commands like
1847  *      test unit ready (so wrongly see the device as having a successful
1848  *      recovery)
1849  **/
1850 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1851 {
1852         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1853         struct scsi_device *sdev = scmd->device;
1854
1855         if (!scsi_device_online(sdev) ||
1856             !scsi_medium_access_command(scmd) ||
1857             host_byte(scmd->result) != DID_TIME_OUT ||
1858             eh_disp != SUCCESS)
1859                 return eh_disp;
1860
1861         /*
1862          * The device has timed out executing a medium access command.
1863          * However, the TEST UNIT READY command sent during error
1864          * handling completed successfully. Either the device is in the
1865          * process of recovering or has it suffered an internal failure
1866          * that prevents access to the storage medium.
1867          */
1868         if (!sdkp->ignore_medium_access_errors) {
1869                 sdkp->medium_access_timed_out++;
1870                 sdkp->ignore_medium_access_errors = true;
1871         }
1872
1873         /*
1874          * If the device keeps failing read/write commands but TEST UNIT
1875          * READY always completes successfully we assume that medium
1876          * access is no longer possible and take the device offline.
1877          */
1878         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1879                 scmd_printk(KERN_ERR, scmd,
1880                             "Medium access timeout failure. Offlining disk!\n");
1881                 mutex_lock(&sdev->state_mutex);
1882                 scsi_device_set_state(sdev, SDEV_OFFLINE);
1883                 mutex_unlock(&sdev->state_mutex);
1884
1885                 return SUCCESS;
1886         }
1887
1888         return eh_disp;
1889 }
1890
1891 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1892 {
1893         struct request *req = scmd->request;
1894         struct scsi_device *sdev = scmd->device;
1895         unsigned int transferred, good_bytes;
1896         u64 start_lba, end_lba, bad_lba;
1897
1898         /*
1899          * Some commands have a payload smaller than the device logical
1900          * block size (e.g. INQUIRY on a 4K disk).
1901          */
1902         if (scsi_bufflen(scmd) <= sdev->sector_size)
1903                 return 0;
1904
1905         /* Check if we have a 'bad_lba' information */
1906         if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1907                                      SCSI_SENSE_BUFFERSIZE,
1908                                      &bad_lba))
1909                 return 0;
1910
1911         /*
1912          * If the bad lba was reported incorrectly, we have no idea where
1913          * the error is.
1914          */
1915         start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1916         end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1917         if (bad_lba < start_lba || bad_lba >= end_lba)
1918                 return 0;
1919
1920         /*
1921          * resid is optional but mostly filled in.  When it's unused,
1922          * its value is zero, so we assume the whole buffer transferred
1923          */
1924         transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1925
1926         /* This computation should always be done in terms of the
1927          * resolution of the device's medium.
1928          */
1929         good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1930
1931         return min(good_bytes, transferred);
1932 }
1933
1934 /**
1935  *      sd_done - bottom half handler: called when the lower level
1936  *      driver has completed (successfully or otherwise) a scsi command.
1937  *      @SCpnt: mid-level's per command structure.
1938  *
1939  *      Note: potentially run from within an ISR. Must not block.
1940  **/
1941 static int sd_done(struct scsi_cmnd *SCpnt)
1942 {
1943         int result = SCpnt->result;
1944         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1945         unsigned int sector_size = SCpnt->device->sector_size;
1946         unsigned int resid;
1947         struct scsi_sense_hdr sshdr;
1948         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1949         struct request *req = SCpnt->request;
1950         int sense_valid = 0;
1951         int sense_deferred = 0;
1952
1953         switch (req_op(req)) {
1954         case REQ_OP_DISCARD:
1955         case REQ_OP_WRITE_ZEROES:
1956         case REQ_OP_WRITE_SAME:
1957         case REQ_OP_ZONE_RESET:
1958                 if (!result) {
1959                         good_bytes = blk_rq_bytes(req);
1960                         scsi_set_resid(SCpnt, 0);
1961                 } else {
1962                         good_bytes = 0;
1963                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1964                 }
1965                 break;
1966         case REQ_OP_ZONE_REPORT:
1967                 if (!result) {
1968                         good_bytes = scsi_bufflen(SCpnt)
1969                                 - scsi_get_resid(SCpnt);
1970                         scsi_set_resid(SCpnt, 0);
1971                 } else {
1972                         good_bytes = 0;
1973                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1974                 }
1975                 break;
1976         default:
1977                 /*
1978                  * In case of bogus fw or device, we could end up having
1979                  * an unaligned partial completion. Check this here and force
1980                  * alignment.
1981                  */
1982                 resid = scsi_get_resid(SCpnt);
1983                 if (resid & (sector_size - 1)) {
1984                         sd_printk(KERN_INFO, sdkp,
1985                                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1986                                 resid, sector_size);
1987                         resid = min(scsi_bufflen(SCpnt),
1988                                     round_up(resid, sector_size));
1989                         scsi_set_resid(SCpnt, resid);
1990                 }
1991         }
1992
1993         if (result) {
1994                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1995                 if (sense_valid)
1996                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1997         }
1998         sdkp->medium_access_timed_out = 0;
1999
2000         if (driver_byte(result) != DRIVER_SENSE &&
2001             (!sense_valid || sense_deferred))
2002                 goto out;
2003
2004         switch (sshdr.sense_key) {
2005         case HARDWARE_ERROR:
2006         case MEDIUM_ERROR:
2007                 good_bytes = sd_completed_bytes(SCpnt);
2008                 break;
2009         case RECOVERED_ERROR:
2010                 good_bytes = scsi_bufflen(SCpnt);
2011                 break;
2012         case NO_SENSE:
2013                 /* This indicates a false check condition, so ignore it.  An
2014                  * unknown amount of data was transferred so treat it as an
2015                  * error.
2016                  */
2017                 SCpnt->result = 0;
2018                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2019                 break;
2020         case ABORTED_COMMAND:
2021                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
2022                         good_bytes = sd_completed_bytes(SCpnt);
2023                 break;
2024         case ILLEGAL_REQUEST:
2025                 switch (sshdr.asc) {
2026                 case 0x10:      /* DIX: Host detected corruption */
2027                         good_bytes = sd_completed_bytes(SCpnt);
2028                         break;
2029                 case 0x20:      /* INVALID COMMAND OPCODE */
2030                 case 0x24:      /* INVALID FIELD IN CDB */
2031                         switch (SCpnt->cmnd[0]) {
2032                         case UNMAP:
2033                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2034                                 break;
2035                         case WRITE_SAME_16:
2036                         case WRITE_SAME:
2037                                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2038                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
2039                                 } else {
2040                                         sdkp->device->no_write_same = 1;
2041                                         sd_config_write_same(sdkp);
2042                                         req->__data_len = blk_rq_bytes(req);
2043                                         req->rq_flags |= RQF_QUIET;
2044                                 }
2045                                 break;
2046                         }
2047                 }
2048                 break;
2049         default:
2050                 break;
2051         }
2052
2053  out:
2054         if (sd_is_zoned(sdkp))
2055                 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2056
2057         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2058                                            "sd_done: completed %d of %d bytes\n",
2059                                            good_bytes, scsi_bufflen(SCpnt)));
2060
2061         if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
2062                 sd_dif_complete(SCpnt, good_bytes);
2063
2064         return good_bytes;
2065 }
2066
2067 /*
2068  * spinup disk - called only in sd_revalidate_disk()
2069  */
2070 static void
2071 sd_spinup_disk(struct scsi_disk *sdkp)
2072 {
2073         unsigned char cmd[10];
2074         unsigned long spintime_expire = 0;
2075         int retries, spintime;
2076         unsigned int the_result;
2077         struct scsi_sense_hdr sshdr;
2078         int sense_valid = 0;
2079
2080         spintime = 0;
2081
2082         /* Spin up drives, as required.  Only do this at boot time */
2083         /* Spinup needs to be done for module loads too. */
2084         do {
2085                 retries = 0;
2086
2087                 do {
2088                         cmd[0] = TEST_UNIT_READY;
2089                         memset((void *) &cmd[1], 0, 9);
2090
2091                         the_result = scsi_execute_req(sdkp->device, cmd,
2092                                                       DMA_NONE, NULL, 0,
2093                                                       &sshdr, SD_TIMEOUT,
2094                                                       SD_MAX_RETRIES, NULL);
2095
2096                         /*
2097                          * If the drive has indicated to us that it
2098                          * doesn't have any media in it, don't bother
2099                          * with any more polling.
2100                          */
2101                         if (media_not_present(sdkp, &sshdr))
2102                                 return;
2103
2104                         if (the_result)
2105                                 sense_valid = scsi_sense_valid(&sshdr);
2106                         retries++;
2107                 } while (retries < 3 &&
2108                          (!scsi_status_is_good(the_result) ||
2109                           ((driver_byte(the_result) & DRIVER_SENSE) &&
2110                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2111
2112                 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
2113                         /* no sense, TUR either succeeded or failed
2114                          * with a status error */
2115                         if(!spintime && !scsi_status_is_good(the_result)) {
2116                                 sd_print_result(sdkp, "Test Unit Ready failed",
2117                                                 the_result);
2118                         }
2119                         break;
2120                 }
2121
2122                 /*
2123                  * The device does not want the automatic start to be issued.
2124                  */
2125                 if (sdkp->device->no_start_on_add)
2126                         break;
2127
2128                 if (sense_valid && sshdr.sense_key == NOT_READY) {
2129                         if (sshdr.asc == 4 && sshdr.ascq == 3)
2130                                 break;  /* manual intervention required */
2131                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2132                                 break;  /* standby */
2133                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2134                                 break;  /* unavailable */
2135                         /*
2136                          * Issue command to spin up drive when not ready
2137                          */
2138                         if (!spintime) {
2139                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2140                                 cmd[0] = START_STOP;
2141                                 cmd[1] = 1;     /* Return immediately */
2142                                 memset((void *) &cmd[2], 0, 8);
2143                                 cmd[4] = 1;     /* Start spin cycle */
2144                                 if (sdkp->device->start_stop_pwr_cond)
2145                                         cmd[4] |= 1 << 4;
2146                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2147                                                  NULL, 0, &sshdr,
2148                                                  SD_TIMEOUT, SD_MAX_RETRIES,
2149                                                  NULL);
2150                                 spintime_expire = jiffies + 100 * HZ;
2151                                 spintime = 1;
2152                         }
2153                         /* Wait 1 second for next try */
2154                         msleep(1000);
2155                         printk(".");
2156
2157                 /*
2158                  * Wait for USB flash devices with slow firmware.
2159                  * Yes, this sense key/ASC combination shouldn't
2160                  * occur here.  It's characteristic of these devices.
2161                  */
2162                 } else if (sense_valid &&
2163                                 sshdr.sense_key == UNIT_ATTENTION &&
2164                                 sshdr.asc == 0x28) {
2165                         if (!spintime) {
2166                                 spintime_expire = jiffies + 5 * HZ;
2167                                 spintime = 1;
2168                         }
2169                         /* Wait 1 second for next try */
2170                         msleep(1000);
2171                 } else {
2172                         /* we don't understand the sense code, so it's
2173                          * probably pointless to loop */
2174                         if(!spintime) {
2175                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2176                                 sd_print_sense_hdr(sdkp, &sshdr);
2177                         }
2178                         break;
2179                 }
2180
2181         } while (spintime && time_before_eq(jiffies, spintime_expire));
2182
2183         if (spintime) {
2184                 if (scsi_status_is_good(the_result))
2185                         printk("ready\n");
2186                 else
2187                         printk("not responding...\n");
2188         }
2189 }
2190
2191 /*
2192  * Determine whether disk supports Data Integrity Field.
2193  */
2194 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2195 {
2196         struct scsi_device *sdp = sdkp->device;
2197         u8 type;
2198         int ret = 0;
2199
2200         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2201                 return ret;
2202
2203         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2204
2205         if (type > T10_PI_TYPE3_PROTECTION)
2206                 ret = -ENODEV;
2207         else if (scsi_host_dif_capable(sdp->host, type))
2208                 ret = 1;
2209
2210         if (sdkp->first_scan || type != sdkp->protection_type)
2211                 switch (ret) {
2212                 case -ENODEV:
2213                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2214                                   " protection type %u. Disabling disk!\n",
2215                                   type);
2216                         break;
2217                 case 1:
2218                         sd_printk(KERN_NOTICE, sdkp,
2219                                   "Enabling DIF Type %u protection\n", type);
2220                         break;
2221                 case 0:
2222                         sd_printk(KERN_NOTICE, sdkp,
2223                                   "Disabling DIF Type %u protection\n", type);
2224                         break;
2225                 }
2226
2227         sdkp->protection_type = type;
2228
2229         return ret;
2230 }
2231
2232 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2233                         struct scsi_sense_hdr *sshdr, int sense_valid,
2234                         int the_result)
2235 {
2236         if (driver_byte(the_result) & DRIVER_SENSE)
2237                 sd_print_sense_hdr(sdkp, sshdr);
2238         else
2239                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2240
2241         /*
2242          * Set dirty bit for removable devices if not ready -
2243          * sometimes drives will not report this properly.
2244          */
2245         if (sdp->removable &&
2246             sense_valid && sshdr->sense_key == NOT_READY)
2247                 set_media_not_present(sdkp);
2248
2249         /*
2250          * We used to set media_present to 0 here to indicate no media
2251          * in the drive, but some drives fail read capacity even with
2252          * media present, so we can't do that.
2253          */
2254         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2255 }
2256
2257 #define RC16_LEN 32
2258 #if RC16_LEN > SD_BUF_SIZE
2259 #error RC16_LEN must not be more than SD_BUF_SIZE
2260 #endif
2261
2262 #define READ_CAPACITY_RETRIES_ON_RESET  10
2263
2264 /*
2265  * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
2266  * and the reported logical block size is bigger than 512 bytes. Note
2267  * that last_sector is a u64 and therefore logical_to_sectors() is not
2268  * applicable.
2269  */
2270 static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
2271 {
2272         u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
2273
2274         if (sizeof(sector_t) == 4 && last_sector > U32_MAX)
2275                 return false;
2276
2277         return true;
2278 }
2279
2280 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2281                                                 unsigned char *buffer)
2282 {
2283         unsigned char cmd[16];
2284         struct scsi_sense_hdr sshdr;
2285         int sense_valid = 0;
2286         int the_result;
2287         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2288         unsigned int alignment;
2289         unsigned long long lba;
2290         unsigned sector_size;
2291
2292         if (sdp->no_read_capacity_16)
2293                 return -EINVAL;
2294
2295         do {
2296                 memset(cmd, 0, 16);
2297                 cmd[0] = SERVICE_ACTION_IN_16;
2298                 cmd[1] = SAI_READ_CAPACITY_16;
2299                 cmd[13] = RC16_LEN;
2300                 memset(buffer, 0, RC16_LEN);
2301
2302                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2303                                         buffer, RC16_LEN, &sshdr,
2304                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2305
2306                 if (media_not_present(sdkp, &sshdr))
2307                         return -ENODEV;
2308
2309                 if (the_result) {
2310                         sense_valid = scsi_sense_valid(&sshdr);
2311                         if (sense_valid &&
2312                             sshdr.sense_key == ILLEGAL_REQUEST &&
2313                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2314                             sshdr.ascq == 0x00)
2315                                 /* Invalid Command Operation Code or
2316                                  * Invalid Field in CDB, just retry
2317                                  * silently with RC10 */
2318                                 return -EINVAL;
2319                         if (sense_valid &&
2320                             sshdr.sense_key == UNIT_ATTENTION &&
2321                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2322                                 /* Device reset might occur several times,
2323                                  * give it one more chance */
2324                                 if (--reset_retries > 0)
2325                                         continue;
2326                 }
2327                 retries--;
2328
2329         } while (the_result && retries);
2330
2331         if (the_result) {
2332                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2333                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2334                 return -EINVAL;
2335         }
2336
2337         sector_size = get_unaligned_be32(&buffer[8]);
2338         lba = get_unaligned_be64(&buffer[0]);
2339
2340         if (sd_read_protection_type(sdkp, buffer) < 0) {
2341                 sdkp->capacity = 0;
2342                 return -ENODEV;
2343         }
2344
2345         if (!sd_addressable_capacity(lba, sector_size)) {
2346                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2347                         "kernel compiled with support for large block "
2348                         "devices.\n");
2349                 sdkp->capacity = 0;
2350                 return -EOVERFLOW;
2351         }
2352
2353         /* Logical blocks per physical block exponent */
2354         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2355
2356         /* RC basis */
2357         sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2358
2359         /* Lowest aligned logical block */
2360         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2361         blk_queue_alignment_offset(sdp->request_queue, alignment);
2362         if (alignment && sdkp->first_scan)
2363                 sd_printk(KERN_NOTICE, sdkp,
2364                           "physical block alignment offset: %u\n", alignment);
2365
2366         if (buffer[14] & 0x80) { /* LBPME */
2367                 sdkp->lbpme = 1;
2368
2369                 if (buffer[14] & 0x40) /* LBPRZ */
2370                         sdkp->lbprz = 1;
2371
2372                 sd_config_discard(sdkp, SD_LBP_WS16);
2373         }
2374
2375         sdkp->capacity = lba + 1;
2376         return sector_size;
2377 }
2378
2379 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2380                                                 unsigned char *buffer)
2381 {
2382         unsigned char cmd[16];
2383         struct scsi_sense_hdr sshdr;
2384         int sense_valid = 0;
2385         int the_result;
2386         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2387         sector_t lba;
2388         unsigned sector_size;
2389
2390         do {
2391                 cmd[0] = READ_CAPACITY;
2392                 memset(&cmd[1], 0, 9);
2393                 memset(buffer, 0, 8);
2394
2395                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2396                                         buffer, 8, &sshdr,
2397                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2398
2399                 if (media_not_present(sdkp, &sshdr))
2400                         return -ENODEV;
2401
2402                 if (the_result) {
2403                         sense_valid = scsi_sense_valid(&sshdr);
2404                         if (sense_valid &&
2405                             sshdr.sense_key == UNIT_ATTENTION &&
2406                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2407                                 /* Device reset might occur several times,
2408                                  * give it one more chance */
2409                                 if (--reset_retries > 0)
2410                                         continue;
2411                 }
2412                 retries--;
2413
2414         } while (the_result && retries);
2415
2416         if (the_result) {
2417                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2418                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2419                 return -EINVAL;
2420         }
2421
2422         sector_size = get_unaligned_be32(&buffer[4]);
2423         lba = get_unaligned_be32(&buffer[0]);
2424
2425         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2426                 /* Some buggy (usb cardreader) devices return an lba of
2427                    0xffffffff when the want to report a size of 0 (with
2428                    which they really mean no media is present) */
2429                 sdkp->capacity = 0;
2430                 sdkp->physical_block_size = sector_size;
2431                 return sector_size;
2432         }
2433
2434         if (!sd_addressable_capacity(lba, sector_size)) {
2435                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2436                         "kernel compiled with support for large block "
2437                         "devices.\n");
2438                 sdkp->capacity = 0;
2439                 return -EOVERFLOW;
2440         }
2441
2442         sdkp->capacity = lba + 1;
2443         sdkp->physical_block_size = sector_size;
2444         return sector_size;
2445 }
2446
2447 static int sd_try_rc16_first(struct scsi_device *sdp)
2448 {
2449         if (sdp->host->max_cmd_len < 16)
2450                 return 0;
2451         if (sdp->try_rc_10_first)
2452                 return 0;
2453         if (sdp->scsi_level > SCSI_SPC_2)
2454                 return 1;
2455         if (scsi_device_protection(sdp))
2456                 return 1;
2457         return 0;
2458 }
2459
2460 /*
2461  * read disk capacity
2462  */
2463 static void
2464 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2465 {
2466         int sector_size;
2467         struct scsi_device *sdp = sdkp->device;
2468
2469         if (sd_try_rc16_first(sdp)) {
2470                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2471                 if (sector_size == -EOVERFLOW)
2472                         goto got_data;
2473                 if (sector_size == -ENODEV)
2474                         return;
2475                 if (sector_size < 0)
2476                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2477                 if (sector_size < 0)
2478                         return;
2479         } else {
2480                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2481                 if (sector_size == -EOVERFLOW)
2482                         goto got_data;
2483                 if (sector_size < 0)
2484                         return;
2485                 if ((sizeof(sdkp->capacity) > 4) &&
2486                     (sdkp->capacity > 0xffffffffULL)) {
2487                         int old_sector_size = sector_size;
2488                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2489                                         "Trying to use READ CAPACITY(16).\n");
2490                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2491                         if (sector_size < 0) {
2492                                 sd_printk(KERN_NOTICE, sdkp,
2493                                         "Using 0xffffffff as device size\n");
2494                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2495                                 sector_size = old_sector_size;
2496                                 goto got_data;
2497                         }
2498                 }
2499         }
2500
2501         /* Some devices are known to return the total number of blocks,
2502          * not the highest block number.  Some devices have versions
2503          * which do this and others which do not.  Some devices we might
2504          * suspect of doing this but we don't know for certain.
2505          *
2506          * If we know the reported capacity is wrong, decrement it.  If
2507          * we can only guess, then assume the number of blocks is even
2508          * (usually true but not always) and err on the side of lowering
2509          * the capacity.
2510          */
2511         if (sdp->fix_capacity ||
2512             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2513                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2514                                 "from its reported value: %llu\n",
2515                                 (unsigned long long) sdkp->capacity);
2516                 --sdkp->capacity;
2517         }
2518
2519 got_data:
2520         if (sector_size == 0) {
2521                 sector_size = 512;
2522                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2523                           "assuming 512.\n");
2524         }
2525
2526         if (sector_size != 512 &&
2527             sector_size != 1024 &&
2528             sector_size != 2048 &&
2529             sector_size != 4096) {
2530                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2531                           sector_size);
2532                 /*
2533                  * The user might want to re-format the drive with
2534                  * a supported sectorsize.  Once this happens, it
2535                  * would be relatively trivial to set the thing up.
2536                  * For this reason, we leave the thing in the table.
2537                  */
2538                 sdkp->capacity = 0;
2539                 /*
2540                  * set a bogus sector size so the normal read/write
2541                  * logic in the block layer will eventually refuse any
2542                  * request on this device without tripping over power
2543                  * of two sector size assumptions
2544                  */
2545                 sector_size = 512;
2546         }
2547         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2548         blk_queue_physical_block_size(sdp->request_queue,
2549                                       sdkp->physical_block_size);
2550         sdkp->device->sector_size = sector_size;
2551
2552         if (sdkp->capacity > 0xffffffff)
2553                 sdp->use_16_for_rw = 1;
2554
2555 }
2556
2557 /*
2558  * Print disk capacity
2559  */
2560 static void
2561 sd_print_capacity(struct scsi_disk *sdkp,
2562                   sector_t old_capacity)
2563 {
2564         int sector_size = sdkp->device->sector_size;
2565         char cap_str_2[10], cap_str_10[10];
2566
2567         string_get_size(sdkp->capacity, sector_size,
2568                         STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2569         string_get_size(sdkp->capacity, sector_size,
2570                         STRING_UNITS_10, cap_str_10,
2571                         sizeof(cap_str_10));
2572
2573         if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2574                 sd_printk(KERN_NOTICE, sdkp,
2575                           "%llu %d-byte logical blocks: (%s/%s)\n",
2576                           (unsigned long long)sdkp->capacity,
2577                           sector_size, cap_str_10, cap_str_2);
2578
2579                 if (sdkp->physical_block_size != sector_size)
2580                         sd_printk(KERN_NOTICE, sdkp,
2581                                   "%u-byte physical blocks\n",
2582                                   sdkp->physical_block_size);
2583
2584                 sd_zbc_print_zones(sdkp);
2585         }
2586 }
2587
2588 /* called with buffer of length 512 */
2589 static inline int
2590 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2591                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2592                  struct scsi_sense_hdr *sshdr)
2593 {
2594         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2595                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2596                                sshdr);
2597 }
2598
2599 /*
2600  * read write protect setting, if possible - called only in sd_revalidate_disk()
2601  * called with buffer of length SD_BUF_SIZE
2602  */
2603 static void
2604 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2605 {
2606         int res;
2607         struct scsi_device *sdp = sdkp->device;
2608         struct scsi_mode_data data;
2609         int old_wp = sdkp->write_prot;
2610
2611         set_disk_ro(sdkp->disk, 0);
2612         if (sdp->skip_ms_page_3f) {
2613                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2614                 return;
2615         }
2616
2617         if (sdp->use_192_bytes_for_3f) {
2618                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2619         } else {
2620                 /*
2621                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2622                  * We have to start carefully: some devices hang if we ask
2623                  * for more than is available.
2624                  */
2625                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2626
2627                 /*
2628                  * Second attempt: ask for page 0 When only page 0 is
2629                  * implemented, a request for page 3F may return Sense Key
2630                  * 5: Illegal Request, Sense Code 24: Invalid field in
2631                  * CDB.
2632                  */
2633                 if (!scsi_status_is_good(res))
2634                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2635
2636                 /*
2637                  * Third attempt: ask 255 bytes, as we did earlier.
2638                  */
2639                 if (!scsi_status_is_good(res))
2640                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2641                                                &data, NULL);
2642         }
2643
2644         if (!scsi_status_is_good(res)) {
2645                 sd_first_printk(KERN_WARNING, sdkp,
2646                           "Test WP failed, assume Write Enabled\n");
2647         } else {
2648                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2649                 set_disk_ro(sdkp->disk, sdkp->write_prot);
2650                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2651                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2652                                   sdkp->write_prot ? "on" : "off");
2653                         sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2654                 }
2655         }
2656 }
2657
2658 /*
2659  * sd_read_cache_type - called only from sd_revalidate_disk()
2660  * called with buffer of length SD_BUF_SIZE
2661  */
2662 static void
2663 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2664 {
2665         int len = 0, res;
2666         struct scsi_device *sdp = sdkp->device;
2667
2668         int dbd;
2669         int modepage;
2670         int first_len;
2671         struct scsi_mode_data data;
2672         struct scsi_sense_hdr sshdr;
2673         int old_wce = sdkp->WCE;
2674         int old_rcd = sdkp->RCD;
2675         int old_dpofua = sdkp->DPOFUA;
2676
2677
2678         if (sdkp->cache_override)
2679                 return;
2680
2681         first_len = 4;
2682         if (sdp->skip_ms_page_8) {
2683                 if (sdp->type == TYPE_RBC)
2684                         goto defaults;
2685                 else {
2686                         if (sdp->skip_ms_page_3f)
2687                                 goto defaults;
2688                         modepage = 0x3F;
2689                         if (sdp->use_192_bytes_for_3f)
2690                                 first_len = 192;
2691                         dbd = 0;
2692                 }
2693         } else if (sdp->type == TYPE_RBC) {
2694                 modepage = 6;
2695                 dbd = 8;
2696         } else {
2697                 modepage = 8;
2698                 dbd = 0;
2699         }
2700
2701         /* cautiously ask */
2702         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2703                         &data, &sshdr);
2704
2705         if (!scsi_status_is_good(res))
2706                 goto bad_sense;
2707
2708         if (!data.header_length) {
2709                 modepage = 6;
2710                 first_len = 0;
2711                 sd_first_printk(KERN_ERR, sdkp,
2712                                 "Missing header in MODE_SENSE response\n");
2713         }
2714
2715         /* that went OK, now ask for the proper length */
2716         len = data.length;
2717
2718         /*
2719          * We're only interested in the first three bytes, actually.
2720          * But the data cache page is defined for the first 20.
2721          */
2722         if (len < 3)
2723                 goto bad_sense;
2724         else if (len > SD_BUF_SIZE) {
2725                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2726                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2727                 len = SD_BUF_SIZE;
2728         }
2729         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2730                 len = 192;
2731
2732         /* Get the data */
2733         if (len > first_len)
2734                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2735                                 &data, &sshdr);
2736
2737         if (scsi_status_is_good(res)) {
2738                 int offset = data.header_length + data.block_descriptor_length;
2739
2740                 while (offset < len) {
2741                         u8 page_code = buffer[offset] & 0x3F;
2742                         u8 spf       = buffer[offset] & 0x40;
2743
2744                         if (page_code == 8 || page_code == 6) {
2745                                 /* We're interested only in the first 3 bytes.
2746                                  */
2747                                 if (len - offset <= 2) {
2748                                         sd_first_printk(KERN_ERR, sdkp,
2749                                                 "Incomplete mode parameter "
2750                                                         "data\n");
2751                                         goto defaults;
2752                                 } else {
2753                                         modepage = page_code;
2754                                         goto Page_found;
2755                                 }
2756                         } else {
2757                                 /* Go to the next page */
2758                                 if (spf && len - offset > 3)
2759                                         offset += 4 + (buffer[offset+2] << 8) +
2760                                                 buffer[offset+3];
2761                                 else if (!spf && len - offset > 1)
2762                                         offset += 2 + buffer[offset+1];
2763                                 else {
2764                                         sd_first_printk(KERN_ERR, sdkp,
2765                                                         "Incomplete mode "
2766                                                         "parameter data\n");
2767                                         goto defaults;
2768                                 }
2769                         }
2770                 }
2771
2772                 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2773                 goto defaults;
2774
2775         Page_found:
2776                 if (modepage == 8) {
2777                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2778                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2779                 } else {
2780                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2781                         sdkp->RCD = 0;
2782                 }
2783
2784                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2785                 if (sdp->broken_fua) {
2786                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2787                         sdkp->DPOFUA = 0;
2788                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2789                            !sdkp->device->use_16_for_rw) {
2790                         sd_first_printk(KERN_NOTICE, sdkp,
2791                                   "Uses READ/WRITE(6), disabling FUA\n");
2792                         sdkp->DPOFUA = 0;
2793                 }
2794
2795                 /* No cache flush allowed for write protected devices */
2796                 if (sdkp->WCE && sdkp->write_prot)
2797                         sdkp->WCE = 0;
2798
2799                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2800                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2801                         sd_printk(KERN_NOTICE, sdkp,
2802                                   "Write cache: %s, read cache: %s, %s\n",
2803                                   sdkp->WCE ? "enabled" : "disabled",
2804                                   sdkp->RCD ? "disabled" : "enabled",
2805                                   sdkp->DPOFUA ? "supports DPO and FUA"
2806                                   : "doesn't support DPO or FUA");
2807
2808                 return;
2809         }
2810
2811 bad_sense:
2812         if (scsi_sense_valid(&sshdr) &&
2813             sshdr.sense_key == ILLEGAL_REQUEST &&
2814             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2815                 /* Invalid field in CDB */
2816                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2817         else
2818                 sd_first_printk(KERN_ERR, sdkp,
2819                                 "Asking for cache data failed\n");
2820
2821 defaults:
2822         if (sdp->wce_default_on) {
2823                 sd_first_printk(KERN_NOTICE, sdkp,
2824                                 "Assuming drive cache: write back\n");
2825                 sdkp->WCE = 1;
2826         } else {
2827                 sd_first_printk(KERN_ERR, sdkp,
2828                                 "Assuming drive cache: write through\n");
2829                 sdkp->WCE = 0;
2830         }
2831         sdkp->RCD = 0;
2832         sdkp->DPOFUA = 0;
2833 }
2834
2835 /*
2836  * The ATO bit indicates whether the DIF application tag is available
2837  * for use by the operating system.
2838  */
2839 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2840 {
2841         int res, offset;
2842         struct scsi_device *sdp = sdkp->device;
2843         struct scsi_mode_data data;
2844         struct scsi_sense_hdr sshdr;
2845
2846         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2847                 return;
2848
2849         if (sdkp->protection_type == 0)
2850                 return;
2851
2852         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2853                               SD_MAX_RETRIES, &data, &sshdr);
2854
2855         if (!scsi_status_is_good(res) || !data.header_length ||
2856             data.length < 6) {
2857                 sd_first_printk(KERN_WARNING, sdkp,
2858                           "getting Control mode page failed, assume no ATO\n");
2859
2860                 if (scsi_sense_valid(&sshdr))
2861                         sd_print_sense_hdr(sdkp, &sshdr);
2862
2863                 return;
2864         }
2865
2866         offset = data.header_length + data.block_descriptor_length;
2867
2868         if ((buffer[offset] & 0x3f) != 0x0a) {
2869                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2870                 return;
2871         }
2872
2873         if ((buffer[offset + 5] & 0x80) == 0)
2874                 return;
2875
2876         sdkp->ATO = 1;
2877
2878         return;
2879 }
2880
2881 /**
2882  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2883  * @sdkp: disk to query
2884  */
2885 static void sd_read_block_limits(struct scsi_disk *sdkp)
2886 {
2887         unsigned int sector_sz = sdkp->device->sector_size;
2888         const int vpd_len = 64;
2889         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2890
2891         if (!buffer ||
2892             /* Block Limits VPD */
2893             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2894                 goto out;
2895
2896         blk_queue_io_min(sdkp->disk->queue,
2897                          get_unaligned_be16(&buffer[6]) * sector_sz);
2898
2899         sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2900         sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2901
2902         if (buffer[3] == 0x3c) {
2903                 unsigned int lba_count, desc_count;
2904
2905                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2906
2907                 if (!sdkp->lbpme)
2908                         goto out;
2909
2910                 lba_count = get_unaligned_be32(&buffer[20]);
2911                 desc_count = get_unaligned_be32(&buffer[24]);
2912
2913                 if (lba_count && desc_count)
2914                         sdkp->max_unmap_blocks = lba_count;
2915
2916                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2917
2918                 if (buffer[32] & 0x80)
2919                         sdkp->unmap_alignment =
2920                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2921
2922                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2923
2924                         if (sdkp->max_unmap_blocks)
2925                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2926                         else
2927                                 sd_config_discard(sdkp, SD_LBP_WS16);
2928
2929                 } else {        /* LBP VPD page tells us what to use */
2930                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2931                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2932                         else if (sdkp->lbpws)
2933                                 sd_config_discard(sdkp, SD_LBP_WS16);
2934                         else if (sdkp->lbpws10)
2935                                 sd_config_discard(sdkp, SD_LBP_WS10);
2936                         else
2937                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2938                 }
2939         }
2940
2941  out:
2942         kfree(buffer);
2943 }
2944
2945 /**
2946  * sd_read_block_characteristics - Query block dev. characteristics
2947  * @sdkp: disk to query
2948  */
2949 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2950 {
2951         struct request_queue *q = sdkp->disk->queue;
2952         unsigned char *buffer;
2953         u16 rot;
2954         const int vpd_len = 64;
2955
2956         buffer = kmalloc(vpd_len, GFP_KERNEL);
2957
2958         if (!buffer ||
2959             /* Block Device Characteristics VPD */
2960             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2961                 goto out;
2962
2963         rot = get_unaligned_be16(&buffer[4]);
2964
2965         if (rot == 1) {
2966                 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
2967                 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
2968         }
2969
2970         if (sdkp->device->type == TYPE_ZBC) {
2971                 /* Host-managed */
2972                 q->limits.zoned = BLK_ZONED_HM;
2973         } else {
2974                 sdkp->zoned = (buffer[8] >> 4) & 3;
2975                 if (sdkp->zoned == 1)
2976                         /* Host-aware */
2977                         q->limits.zoned = BLK_ZONED_HA;
2978                 else
2979                         /*
2980                          * Treat drive-managed devices as
2981                          * regular block devices.
2982                          */
2983                         q->limits.zoned = BLK_ZONED_NONE;
2984         }
2985         if (blk_queue_is_zoned(q) && sdkp->first_scan)
2986                 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2987                       q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2988
2989  out:
2990         kfree(buffer);
2991 }
2992
2993 /**
2994  * sd_read_block_provisioning - Query provisioning VPD page
2995  * @sdkp: disk to query
2996  */
2997 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2998 {
2999         unsigned char *buffer;
3000         const int vpd_len = 8;
3001
3002         if (sdkp->lbpme == 0)
3003                 return;
3004
3005         buffer = kmalloc(vpd_len, GFP_KERNEL);
3006
3007         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
3008                 goto out;
3009
3010         sdkp->lbpvpd    = 1;
3011         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
3012         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
3013         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
3014
3015  out:
3016         kfree(buffer);
3017 }
3018
3019 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
3020 {
3021         struct scsi_device *sdev = sdkp->device;
3022
3023         if (sdev->host->no_write_same) {
3024                 sdev->no_write_same = 1;
3025
3026                 return;
3027         }
3028
3029         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
3030                 /* too large values might cause issues with arcmsr */
3031                 int vpd_buf_len = 64;
3032
3033                 sdev->no_report_opcodes = 1;
3034
3035                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3036                  * CODES is unsupported and the device has an ATA
3037                  * Information VPD page (SAT).
3038                  */
3039                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3040                         sdev->no_write_same = 1;
3041         }
3042
3043         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3044                 sdkp->ws16 = 1;
3045
3046         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3047                 sdkp->ws10 = 1;
3048 }
3049
3050 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3051 {
3052         struct scsi_device *sdev = sdkp->device;
3053
3054         if (!sdev->security_supported)
3055                 return;
3056
3057         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3058                         SECURITY_PROTOCOL_IN) == 1 &&
3059             scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3060                         SECURITY_PROTOCOL_OUT) == 1)
3061                 sdkp->security = 1;
3062 }
3063
3064 /**
3065  *      sd_revalidate_disk - called the first time a new disk is seen,
3066  *      performs disk spin up, read_capacity, etc.
3067  *      @disk: struct gendisk we care about
3068  **/
3069 static int sd_revalidate_disk(struct gendisk *disk)
3070 {
3071         struct scsi_disk *sdkp = scsi_disk(disk);
3072         struct scsi_device *sdp = sdkp->device;
3073         struct request_queue *q = sdkp->disk->queue;
3074         sector_t old_capacity = sdkp->capacity;
3075         unsigned char *buffer;
3076         unsigned int dev_max, rw_max;
3077
3078         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3079                                       "sd_revalidate_disk\n"));
3080
3081         /*
3082          * If the device is offline, don't try and read capacity or any
3083          * of the other niceties.
3084          */
3085         if (!scsi_device_online(sdp))
3086                 goto out;
3087
3088         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3089         if (!buffer) {
3090                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3091                           "allocation failure.\n");
3092                 goto out;
3093         }
3094
3095         sd_spinup_disk(sdkp);
3096
3097         /*
3098          * Without media there is no reason to ask; moreover, some devices
3099          * react badly if we do.
3100          */
3101         if (sdkp->media_present) {
3102                 sd_read_capacity(sdkp, buffer);
3103
3104                 if (scsi_device_supports_vpd(sdp)) {
3105                         sd_read_block_provisioning(sdkp);
3106                         sd_read_block_limits(sdkp);
3107                         sd_read_block_characteristics(sdkp);
3108                         sd_zbc_read_zones(sdkp, buffer);
3109                 }
3110
3111                 sd_print_capacity(sdkp, old_capacity);
3112
3113                 sd_read_write_protect_flag(sdkp, buffer);
3114                 sd_read_cache_type(sdkp, buffer);
3115                 sd_read_app_tag_own(sdkp, buffer);
3116                 sd_read_write_same(sdkp, buffer);
3117                 sd_read_security(sdkp, buffer);
3118         }
3119
3120         /*
3121          * We now have all cache related info, determine how we deal
3122          * with flush requests.
3123          */
3124         sd_set_flush_flag(sdkp);
3125
3126         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3127         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3128
3129         /* Some devices report a maximum block count for READ/WRITE requests. */
3130         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3131         q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3132
3133         /*
3134          * Determine the device's preferred I/O size for reads and writes
3135          * unless the reported value is unreasonably small, large, or
3136          * garbage.
3137          */
3138         if (sdkp->opt_xfer_blocks &&
3139             sdkp->opt_xfer_blocks <= dev_max &&
3140             sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
3141             logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
3142                 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3143                 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3144         } else
3145                 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3146                                       (sector_t)BLK_DEF_MAX_SECTORS);
3147
3148         /* Do not exceed controller limit */
3149         rw_max = min(rw_max, queue_max_hw_sectors(q));
3150
3151         /*
3152          * Only update max_sectors if previously unset or if the current value
3153          * exceeds the capabilities of the hardware.
3154          */
3155         if (sdkp->first_scan ||
3156             q->limits.max_sectors > q->limits.max_dev_sectors ||
3157             q->limits.max_sectors > q->limits.max_hw_sectors)
3158                 q->limits.max_sectors = rw_max;
3159
3160         sdkp->first_scan = 0;
3161
3162         set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3163         sd_config_write_same(sdkp);
3164         kfree(buffer);
3165
3166  out:
3167         return 0;
3168 }
3169
3170 /**
3171  *      sd_unlock_native_capacity - unlock native capacity
3172  *      @disk: struct gendisk to set capacity for
3173  *
3174  *      Block layer calls this function if it detects that partitions
3175  *      on @disk reach beyond the end of the device.  If the SCSI host
3176  *      implements ->unlock_native_capacity() method, it's invoked to
3177  *      give it a chance to adjust the device capacity.
3178  *
3179  *      CONTEXT:
3180  *      Defined by block layer.  Might sleep.
3181  */
3182 static void sd_unlock_native_capacity(struct gendisk *disk)
3183 {
3184         struct scsi_device *sdev = scsi_disk(disk)->device;
3185
3186         if (sdev->host->hostt->unlock_native_capacity)
3187                 sdev->host->hostt->unlock_native_capacity(sdev);
3188 }
3189
3190 /**
3191  *      sd_format_disk_name - format disk name
3192  *      @prefix: name prefix - ie. "sd" for SCSI disks
3193  *      @index: index of the disk to format name for
3194  *      @buf: output buffer
3195  *      @buflen: length of the output buffer
3196  *
3197  *      SCSI disk names starts at sda.  The 26th device is sdz and the
3198  *      27th is sdaa.  The last one for two lettered suffix is sdzz
3199  *      which is followed by sdaaa.
3200  *
3201  *      This is basically 26 base counting with one extra 'nil' entry
3202  *      at the beginning from the second digit on and can be
3203  *      determined using similar method as 26 base conversion with the
3204  *      index shifted -1 after each digit is computed.
3205  *
3206  *      CONTEXT:
3207  *      Don't care.
3208  *
3209  *      RETURNS:
3210  *      0 on success, -errno on failure.
3211  */
3212 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3213 {
3214         const int base = 'z' - 'a' + 1;
3215         char *begin = buf + strlen(prefix);
3216         char *end = buf + buflen;
3217         char *p;
3218         int unit;
3219
3220         p = end - 1;
3221         *p = '\0';
3222         unit = base;
3223         do {
3224                 if (p == begin)
3225                         return -EINVAL;
3226                 *--p = 'a' + (index % unit);
3227                 index = (index / unit) - 1;
3228         } while (index >= 0);
3229
3230         memmove(begin, p, end - p);
3231         memcpy(buf, prefix, strlen(prefix));
3232
3233         return 0;
3234 }
3235
3236 /*
3237  * The asynchronous part of sd_probe
3238  */
3239 static void sd_probe_async(void *data, async_cookie_t cookie)
3240 {
3241         struct scsi_disk *sdkp = data;
3242         struct scsi_device *sdp;
3243         struct gendisk *gd;
3244         u32 index;
3245         struct device *dev;
3246
3247         sdp = sdkp->device;
3248         gd = sdkp->disk;
3249         index = sdkp->index;
3250         dev = &sdp->sdev_gendev;
3251
3252         gd->major = sd_major((index & 0xf0) >> 4);
3253         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3254
3255         gd->fops = &sd_fops;
3256         gd->private_data = &sdkp->driver;
3257         gd->queue = sdkp->device->request_queue;
3258
3259         /* defaults, until the device tells us otherwise */
3260         sdp->sector_size = 512;
3261         sdkp->capacity = 0;
3262         sdkp->media_present = 1;
3263         sdkp->write_prot = 0;
3264         sdkp->cache_override = 0;
3265         sdkp->WCE = 0;
3266         sdkp->RCD = 0;
3267         sdkp->ATO = 0;
3268         sdkp->first_scan = 1;
3269         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3270
3271         sd_revalidate_disk(gd);
3272
3273         gd->flags = GENHD_FL_EXT_DEVT;
3274         if (sdp->removable) {
3275                 gd->flags |= GENHD_FL_REMOVABLE;
3276                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3277         }
3278
3279         blk_pm_runtime_init(sdp->request_queue, dev);
3280         device_add_disk(dev, gd);
3281         if (sdkp->capacity)
3282                 sd_dif_config_host(sdkp);
3283
3284         sd_revalidate_disk(gd);
3285
3286         if (sdkp->security) {
3287                 sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit);
3288                 if (sdkp->opal_dev)
3289                         sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
3290         }
3291
3292         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3293                   sdp->removable ? "removable " : "");
3294         scsi_autopm_put_device(sdp);
3295         put_device(&sdkp->dev);
3296 }
3297
3298 /**
3299  *      sd_probe - called during driver initialization and whenever a
3300  *      new scsi device is attached to the system. It is called once
3301  *      for each scsi device (not just disks) present.
3302  *      @dev: pointer to device object
3303  *
3304  *      Returns 0 if successful (or not interested in this scsi device
3305  *      (e.g. scanner)); 1 when there is an error.
3306  *
3307  *      Note: this function is invoked from the scsi mid-level.
3308  *      This function sets up the mapping between a given
3309  *      <host,channel,id,lun> (found in sdp) and new device name
3310  *      (e.g. /dev/sda). More precisely it is the block device major
3311  *      and minor number that is chosen here.
3312  *
3313  *      Assume sd_probe is not re-entrant (for time being)
3314  *      Also think about sd_probe() and sd_remove() running coincidentally.
3315  **/
3316 static int sd_probe(struct device *dev)
3317 {
3318         struct scsi_device *sdp = to_scsi_device(dev);
3319         struct scsi_disk *sdkp;
3320         struct gendisk *gd;
3321         int index;
3322         int error;
3323
3324         scsi_autopm_get_device(sdp);
3325         error = -ENODEV;
3326         if (sdp->type != TYPE_DISK &&
3327             sdp->type != TYPE_ZBC &&
3328             sdp->type != TYPE_MOD &&
3329             sdp->type != TYPE_RBC)
3330                 goto out;
3331
3332 #ifndef CONFIG_BLK_DEV_ZONED
3333         if (sdp->type == TYPE_ZBC)
3334                 goto out;
3335 #endif
3336         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3337                                         "sd_probe\n"));
3338
3339         error = -ENOMEM;
3340         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3341         if (!sdkp)
3342                 goto out;
3343
3344         gd = alloc_disk(SD_MINORS);
3345         if (!gd)
3346                 goto out_free;
3347
3348         do {
3349                 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3350                         goto out_put;
3351
3352                 spin_lock(&sd_index_lock);
3353                 error = ida_get_new(&sd_index_ida, &index);
3354                 spin_unlock(&sd_index_lock);
3355         } while (error == -EAGAIN);
3356
3357         if (error) {
3358                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3359                 goto out_put;
3360         }
3361
3362         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3363         if (error) {
3364                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3365                 goto out_free_index;
3366         }
3367
3368         sdkp->device = sdp;
3369         sdkp->driver = &sd_template;
3370         sdkp->disk = gd;
3371         sdkp->index = index;
3372         atomic_set(&sdkp->openers, 0);
3373         atomic_set(&sdkp->device->ioerr_cnt, 0);
3374
3375         if (!sdp->request_queue->rq_timeout) {
3376                 if (sdp->type != TYPE_MOD)
3377                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3378                 else
3379                         blk_queue_rq_timeout(sdp->request_queue,
3380                                              SD_MOD_TIMEOUT);
3381         }
3382
3383         device_initialize(&sdkp->dev);
3384         sdkp->dev.parent = dev;
3385         sdkp->dev.class = &sd_disk_class;
3386         dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3387
3388         error = device_add(&sdkp->dev);
3389         if (error)
3390                 goto out_free_index;
3391
3392         get_device(dev);
3393         dev_set_drvdata(dev, sdkp);
3394
3395         get_device(&sdkp->dev); /* prevent release before async_schedule */
3396         async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3397
3398         return 0;
3399
3400  out_free_index:
3401         spin_lock(&sd_index_lock);
3402         ida_remove(&sd_index_ida, index);
3403         spin_unlock(&sd_index_lock);
3404  out_put:
3405         put_disk(gd);
3406  out_free:
3407         kfree(sdkp);
3408  out:
3409         scsi_autopm_put_device(sdp);
3410         return error;
3411 }
3412
3413 /**
3414  *      sd_remove - called whenever a scsi disk (previously recognized by
3415  *      sd_probe) is detached from the system. It is called (potentially
3416  *      multiple times) during sd module unload.
3417  *      @dev: pointer to device object
3418  *
3419  *      Note: this function is invoked from the scsi mid-level.
3420  *      This function potentially frees up a device name (e.g. /dev/sdc)
3421  *      that could be re-used by a subsequent sd_probe().
3422  *      This function is not called when the built-in sd driver is "exit-ed".
3423  **/
3424 static int sd_remove(struct device *dev)
3425 {
3426         struct scsi_disk *sdkp;
3427         dev_t devt;
3428
3429         sdkp = dev_get_drvdata(dev);
3430         devt = disk_devt(sdkp->disk);
3431         scsi_autopm_get_device(sdkp->device);
3432
3433         async_synchronize_full_domain(&scsi_sd_pm_domain);
3434         async_synchronize_full_domain(&scsi_sd_probe_domain);
3435         device_del(&sdkp->dev);
3436         del_gendisk(sdkp->disk);
3437         sd_shutdown(dev);
3438
3439         sd_zbc_remove(sdkp);
3440
3441         free_opal_dev(sdkp->opal_dev);
3442
3443         blk_register_region(devt, SD_MINORS, NULL,
3444                             sd_default_probe, NULL, NULL);
3445
3446         mutex_lock(&sd_ref_mutex);
3447         dev_set_drvdata(dev, NULL);
3448         put_device(&sdkp->dev);
3449         mutex_unlock(&sd_ref_mutex);
3450
3451         return 0;
3452 }
3453
3454 /**
3455  *      scsi_disk_release - Called to free the scsi_disk structure
3456  *      @dev: pointer to embedded class device
3457  *
3458  *      sd_ref_mutex must be held entering this routine.  Because it is
3459  *      called on last put, you should always use the scsi_disk_get()
3460  *      scsi_disk_put() helpers which manipulate the semaphore directly
3461  *      and never do a direct put_device.
3462  **/
3463 static void scsi_disk_release(struct device *dev)
3464 {
3465         struct scsi_disk *sdkp = to_scsi_disk(dev);
3466         struct gendisk *disk = sdkp->disk;
3467
3468         spin_lock(&sd_index_lock);
3469         ida_remove(&sd_index_ida, sdkp->index);
3470         spin_unlock(&sd_index_lock);
3471
3472         disk->private_data = NULL;
3473         put_disk(disk);
3474         put_device(&sdkp->device->sdev_gendev);
3475
3476         kfree(sdkp);
3477 }
3478
3479 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3480 {
3481         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3482         struct scsi_sense_hdr sshdr;
3483         struct scsi_device *sdp = sdkp->device;
3484         int res;
3485
3486         if (start)
3487                 cmd[4] |= 1;    /* START */
3488
3489         if (sdp->start_stop_pwr_cond)
3490                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3491
3492         if (!scsi_device_online(sdp))
3493                 return -ENODEV;
3494
3495         res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3496                         SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
3497         if (res) {
3498                 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3499                 if (driver_byte(res) & DRIVER_SENSE)
3500                         sd_print_sense_hdr(sdkp, &sshdr);
3501                 if (scsi_sense_valid(&sshdr) &&
3502                         /* 0x3a is medium not present */
3503                         sshdr.asc == 0x3a)
3504                         res = 0;
3505         }
3506
3507         /* SCSI error codes must not go to the generic layer */
3508         if (res)
3509                 return -EIO;
3510
3511         return 0;
3512 }
3513
3514 /*
3515  * Send a SYNCHRONIZE CACHE instruction down to the device through
3516  * the normal SCSI command structure.  Wait for the command to
3517  * complete.
3518  */
3519 static void sd_shutdown(struct device *dev)
3520 {
3521         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3522
3523         if (!sdkp)
3524                 return;         /* this can happen */
3525
3526         if (pm_runtime_suspended(dev))
3527                 return;
3528
3529         if (sdkp->WCE && sdkp->media_present) {
3530                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3531                 sd_sync_cache(sdkp, NULL);
3532         }
3533
3534         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3535                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3536                 sd_start_stop_device(sdkp, 0);
3537         }
3538 }
3539
3540 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3541 {
3542         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3543         struct scsi_sense_hdr sshdr;
3544         int ret = 0;
3545
3546         if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
3547                 return 0;
3548
3549         if (sdkp->WCE && sdkp->media_present) {
3550                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3551                 ret = sd_sync_cache(sdkp, &sshdr);
3552
3553                 if (ret) {
3554                         /* ignore OFFLINE device */
3555                         if (ret == -ENODEV)
3556                                 return 0;
3557
3558                         if (!scsi_sense_valid(&sshdr) ||
3559                             sshdr.sense_key != ILLEGAL_REQUEST)
3560                                 return ret;
3561
3562                         /*
3563                          * sshdr.sense_key == ILLEGAL_REQUEST means this drive
3564                          * doesn't support sync. There's not much to do and
3565                          * suspend shouldn't fail.
3566                          */
3567                         ret = 0;
3568                 }
3569         }
3570
3571         if (sdkp->device->manage_start_stop) {
3572                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3573                 /* an error is not worth aborting a system sleep */
3574                 ret = sd_start_stop_device(sdkp, 0);
3575                 if (ignore_stop_errors)
3576                         ret = 0;
3577         }
3578
3579         return ret;
3580 }
3581
3582 static int sd_suspend_system(struct device *dev)
3583 {
3584         return sd_suspend_common(dev, true);
3585 }
3586
3587 static int sd_suspend_runtime(struct device *dev)
3588 {
3589         return sd_suspend_common(dev, false);
3590 }
3591
3592 static int sd_resume(struct device *dev)
3593 {
3594         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3595         int ret;
3596
3597         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
3598                 return 0;
3599
3600         if (!sdkp->device->manage_start_stop)
3601                 return 0;
3602
3603         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3604         ret = sd_start_stop_device(sdkp, 1);
3605         if (!ret)
3606                 opal_unlock_from_suspend(sdkp->opal_dev);
3607         return ret;
3608 }
3609
3610 /**
3611  *      init_sd - entry point for this driver (both when built in or when
3612  *      a module).
3613  *
3614  *      Note: this function registers this driver with the scsi mid-level.
3615  **/
3616 static int __init init_sd(void)
3617 {
3618         int majors = 0, i, err;
3619
3620         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3621
3622         for (i = 0; i < SD_MAJORS; i++) {
3623                 if (register_blkdev(sd_major(i), "sd") != 0)
3624                         continue;
3625                 majors++;
3626                 blk_register_region(sd_major(i), SD_MINORS, NULL,
3627                                     sd_default_probe, NULL, NULL);
3628         }
3629
3630         if (!majors)
3631                 return -ENODEV;
3632
3633         err = class_register(&sd_disk_class);
3634         if (err)
3635                 goto err_out;
3636
3637         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3638                                          0, 0, NULL);
3639         if (!sd_cdb_cache) {
3640                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3641                 err = -ENOMEM;
3642                 goto err_out_class;
3643         }
3644
3645         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3646         if (!sd_cdb_pool) {
3647                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3648                 err = -ENOMEM;
3649                 goto err_out_cache;
3650         }
3651
3652         err = scsi_register_driver(&sd_template.gendrv);
3653         if (err)
3654                 goto err_out_driver;
3655
3656         return 0;
3657
3658 err_out_driver:
3659         mempool_destroy(sd_cdb_pool);
3660
3661 err_out_cache:
3662         kmem_cache_destroy(sd_cdb_cache);
3663
3664 err_out_class:
3665         class_unregister(&sd_disk_class);
3666 err_out:
3667         for (i = 0; i < SD_MAJORS; i++)
3668                 unregister_blkdev(sd_major(i), "sd");
3669         return err;
3670 }
3671
3672 /**
3673  *      exit_sd - exit point for this driver (when it is a module).
3674  *
3675  *      Note: this function unregisters this driver from the scsi mid-level.
3676  **/
3677 static void __exit exit_sd(void)
3678 {
3679         int i;
3680
3681         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3682
3683         scsi_unregister_driver(&sd_template.gendrv);
3684         mempool_destroy(sd_cdb_pool);
3685         kmem_cache_destroy(sd_cdb_cache);
3686
3687         class_unregister(&sd_disk_class);
3688
3689         for (i = 0; i < SD_MAJORS; i++) {
3690                 blk_unregister_region(sd_major(i), SD_MINORS);
3691                 unregister_blkdev(sd_major(i), "sd");
3692         }
3693 }
3694
3695 module_init(init_sd);
3696 module_exit(exit_sd);
3697
3698 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3699                                struct scsi_sense_hdr *sshdr)
3700 {
3701         scsi_print_sense_hdr(sdkp->device,
3702                              sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3703 }
3704
3705 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3706                             int result)
3707 {
3708         const char *hb_string = scsi_hostbyte_string(result);
3709         const char *db_string = scsi_driverbyte_string(result);
3710
3711         if (hb_string || db_string)
3712                 sd_printk(KERN_INFO, sdkp,
3713                           "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3714                           hb_string ? hb_string : "invalid",
3715                           db_string ? db_string : "invalid");
3716         else
3717                 sd_printk(KERN_INFO, sdkp,
3718                           "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3719                           msg, host_byte(result), driver_byte(result));
3720 }
3721