drivers/scsi/sd.c

   1 /*
   2  *      sd.c Copyright (C) 1992 Drew Eckhardt
   3  *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   4  *
   5  *      Linux scsi disk driver
   6  *              Initial versions: Drew Eckhardt
   7  *              Subsequent revisions: Eric Youngdale
   8  *      Modification history:
   9  *       - Drew Eckhardt <drew@colorado.edu> original
  10  *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
  11  *         outstanding request, and other enhancements.
  12  *         Support loadable low-level scsi drivers.
  13  *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
  14  *         eight major numbers.
  15  *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
  16  *       - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
  17  *         sd_init and cleanups.
  18  *       - Alex Davis <letmein@erols.com> Fix problem where partition info
  19  *         not being read in sd_open. Fix problem where removable media
  20  *         could be ejected after sd_open.
  21  *       - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
  22  *       - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
  23  *         <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
  24  *         Support 32k/1M disks.
  25  *
  26  *      Logging policy (needs CONFIG_SCSI_LOGGING defined):
  27  *       - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  28  *       - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  29  *       - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  30  *       - entering other commands: SCSI_LOG_HLQUEUE level 3
  31  *      Note: when the logging level is set by the user, it must be greater
  32  *      than the level indicated above to trigger output.
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/fs.h>
  37 #include <linux/kernel.h>
  38 #include <linux/mm.h>
  39 #include <linux/bio.h>
  40 #include <linux/genhd.h>
  41 #include <linux/hdreg.h>
  42 #include <linux/errno.h>
  43 #include <linux/idr.h>
  44 #include <linux/interrupt.h>
  45 #include <linux/init.h>
  46 #include <linux/blkdev.h>
  47 #include <linux/blkpg.h>
  48 #include <linux/blk-pm.h>
  49 #include <linux/delay.h>
  50 #include <linux/mutex.h>
  51 #include <linux/string_helpers.h>
  52 #include <linux/async.h>
  53 #include <linux/slab.h>
  54 #include <linux/sed-opal.h>
  55 #include <linux/pm_runtime.h>
  56 #include <linux/pr.h>
  57 #include <linux/t10-pi.h>
  58 #include <linux/uaccess.h>
  59 #include <asm/unaligned.h>
  60
  61 #include <scsi/scsi.h>
  62 #include <scsi/scsi_cmnd.h>
  63 #include <scsi/scsi_dbg.h>
  64 #include <scsi/scsi_device.h>
  65 #include <scsi/scsi_driver.h>
  66 #include <scsi/scsi_eh.h>
  67 #include <scsi/scsi_host.h>
  68 #include <scsi/scsi_ioctl.h>
  69 #include <scsi/scsicam.h>
  70
  71 #include "sd.h"
  72 #include "scsi_priv.h"
  73 #include "scsi_logging.h"
  74
  75 MODULE_AUTHOR("Eric Youngdale");
  76 MODULE_DESCRIPTION("SCSI disk (sd) driver");
  77 MODULE_LICENSE("GPL");
  78
  79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  94 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  95 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  96 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  97 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  98 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
  99
 100 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
 101 #define SD_MINORS       16
 102 #else
 103 #define SD_MINORS       0
 104 #endif
 105
 106 static void sd_config_discard(struct scsi_disk *, unsigned int);
 107 static void sd_config_write_same(struct scsi_disk *);
 108 static int  sd_revalidate_disk(struct gendisk *);
 109 static void sd_unlock_native_capacity(struct gendisk *disk);
 110 static int  sd_probe(struct device *);
 111 static int  sd_remove(struct device *);
 112 static void sd_shutdown(struct device *);
 113 static int sd_suspend_system(struct device *);
 114 static int sd_suspend_runtime(struct device *);
 115 static int sd_resume(struct device *);
 116 static void sd_rescan(struct device *);
 117 static blk_status_t sd_init_command(struct scsi_cmnd *SCpnt);
 118 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 119 static int sd_done(struct scsi_cmnd *);
 120 static void sd_eh_reset(struct scsi_cmnd *);
 121 static int sd_eh_action(struct scsi_cmnd *, int);
 122 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 123 static void scsi_disk_release(struct device *cdev);
 124 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 125 static void sd_print_result(const struct scsi_disk *, const char *, int);
 126
 127 static DEFINE_IDA(sd_index_ida);
 128
 129 /* This semaphore is used to mediate the 0->1 reference get in the
 130  * face of object destruction (i.e. we can't allow a get on an
 131  * object after last put) */
 132 static DEFINE_MUTEX(sd_ref_mutex);
 133
 134 static struct kmem_cache *sd_cdb_cache;
 135 static mempool_t *sd_cdb_pool;
 136 static mempool_t *sd_page_pool;
 137
 138 static const char *sd_cache_types[] = {
 139         "write through", "none", "write back",
 140         "write back, no read (daft)"
 141 };
 142
 143 static void sd_set_flush_flag(struct scsi_disk *sdkp)
 144 {
 145         bool wc = false, fua = false;
 146
 147         if (sdkp->WCE) {
 148                 wc = true;
 149                 if (sdkp->DPOFUA)
 150                         fua = true;
 151         }
 152
 153         blk_queue_write_cache(sdkp->disk->queue, wc, fua);
 154 }
 155
 156 static ssize_t
 157 cache_type_store(struct device *dev, struct device_attribute *attr,
 158                  const char *buf, size_t count)
 159 {
 160         int ct, rcd, wce, sp;
 161         struct scsi_disk *sdkp = to_scsi_disk(dev);
 162         struct scsi_device *sdp = sdkp->device;
 163         char buffer[64];
 164         char *buffer_data;
 165         struct scsi_mode_data data;
 166         struct scsi_sense_hdr sshdr;
 167         static const char temp[] = "temporary ";
 168         int len;
 169
 170         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 171                 /* no cache control on RBC devices; theoretically they
 172                  * can do it, but there's probably so many exceptions
 173                  * it's not worth the risk */
 174                 return -EINVAL;
 175
 176         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 177                 buf += sizeof(temp) - 1;
 178                 sdkp->cache_override = 1;
 179         } else {
 180                 sdkp->cache_override = 0;
 181         }
 182
 183         ct = sysfs_match_string(sd_cache_types, buf);
 184         if (ct < 0)
 185                 return -EINVAL;
 186
 187         rcd = ct & 0x01 ? 1 : 0;
 188         wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 189
 190         if (sdkp->cache_override) {
 191                 sdkp->WCE = wce;
 192                 sdkp->RCD = rcd;
 193                 sd_set_flush_flag(sdkp);
 194                 return count;
 195         }
 196
 197         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 198                             SD_MAX_RETRIES, &data, NULL))
 199                 return -EINVAL;
 200         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 201                   data.block_descriptor_length);
 202         buffer_data = buffer + data.header_length +
 203                 data.block_descriptor_length;
 204         buffer_data[2] &= ~0x05;
 205         buffer_data[2] |= wce << 2 | rcd;
 206         sp = buffer_data[0] & 0x80 ? 1 : 0;
 207         buffer_data[0] &= ~0x80;
 208
 209         /*
 210          * Ensure WP, DPOFUA, and RESERVED fields are cleared in
 211          * received mode parameter buffer before doing MODE SELECT.
 212          */
 213         data.device_specific = 0;
 214
 215         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 216                              SD_MAX_RETRIES, &data, &sshdr)) {
 217                 if (scsi_sense_valid(&sshdr))
 218                         sd_print_sense_hdr(sdkp, &sshdr);
 219                 return -EINVAL;
 220         }
 221         revalidate_disk(sdkp->disk);
 222         return count;
 223 }
 224
 225 static ssize_t
 226 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
 227                        char *buf)
 228 {
 229         struct scsi_disk *sdkp = to_scsi_disk(dev);
 230         struct scsi_device *sdp = sdkp->device;
 231
 232         return sprintf(buf, "%u\n", sdp->manage_start_stop);
 233 }
 234
 235 static ssize_t
 236 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
 237                         const char *buf, size_t count)
 238 {
 239         struct scsi_disk *sdkp = to_scsi_disk(dev);
 240         struct scsi_device *sdp = sdkp->device;
 241         bool v;
 242
 243         if (!capable(CAP_SYS_ADMIN))
 244                 return -EACCES;
 245
 246         if (kstrtobool(buf, &v))
 247                 return -EINVAL;
 248
 249         sdp->manage_start_stop = v;
 250
 251         return count;
 252 }
 253 static DEVICE_ATTR_RW(manage_start_stop);
 254
 255 static ssize_t
 256 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 257 {
 258         struct scsi_disk *sdkp = to_scsi_disk(dev);
 259
 260         return sprintf(buf, "%u\n", sdkp->device->allow_restart);
 261 }
 262
 263 static ssize_t
 264 allow_restart_store(struct device *dev, struct device_attribute *attr,
 265                     const char *buf, size_t count)
 266 {
 267         bool v;
 268         struct scsi_disk *sdkp = to_scsi_disk(dev);
 269         struct scsi_device *sdp = sdkp->device;
 270
 271         if (!capable(CAP_SYS_ADMIN))
 272                 return -EACCES;
 273
 274         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 275                 return -EINVAL;
 276
 277         if (kstrtobool(buf, &v))
 278                 return -EINVAL;
 279
 280         sdp->allow_restart = v;
 281
 282         return count;
 283 }
 284 static DEVICE_ATTR_RW(allow_restart);
 285
 286 static ssize_t
 287 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 288 {
 289         struct scsi_disk *sdkp = to_scsi_disk(dev);
 290         int ct = sdkp->RCD + 2*sdkp->WCE;
 291
 292         return sprintf(buf, "%s\n", sd_cache_types[ct]);
 293 }
 294 static DEVICE_ATTR_RW(cache_type);
 295
 296 static ssize_t
 297 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 298 {
 299         struct scsi_disk *sdkp = to_scsi_disk(dev);
 300
 301         return sprintf(buf, "%u\n", sdkp->DPOFUA);
 302 }
 303 static DEVICE_ATTR_RO(FUA);
 304
 305 static ssize_t
 306 protection_type_show(struct device *dev, struct device_attribute *attr,
 307                      char *buf)
 308 {
 309         struct scsi_disk *sdkp = to_scsi_disk(dev);
 310
 311         return sprintf(buf, "%u\n", sdkp->protection_type);
 312 }
 313
 314 static ssize_t
 315 protection_type_store(struct device *dev, struct device_attribute *attr,
 316                       const char *buf, size_t count)
 317 {
 318         struct scsi_disk *sdkp = to_scsi_disk(dev);
 319         unsigned int val;
 320         int err;
 321
 322         if (!capable(CAP_SYS_ADMIN))
 323                 return -EACCES;
 324
 325         err = kstrtouint(buf, 10, &val);
 326
 327         if (err)
 328                 return err;
 329
 330         if (val <= T10_PI_TYPE3_PROTECTION)
 331                 sdkp->protection_type = val;
 332
 333         return count;
 334 }
 335 static DEVICE_ATTR_RW(protection_type);
 336
 337 static ssize_t
 338 protection_mode_show(struct device *dev, struct device_attribute *attr,
 339                      char *buf)
 340 {
 341         struct scsi_disk *sdkp = to_scsi_disk(dev);
 342         struct scsi_device *sdp = sdkp->device;
 343         unsigned int dif, dix;
 344
 345         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 346         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 347
 348         if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
 349                 dif = 0;
 350                 dix = 1;
 351         }
 352
 353         if (!dif && !dix)
 354                 return sprintf(buf, "none\n");
 355
 356         return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
 357 }
 358 static DEVICE_ATTR_RO(protection_mode);
 359
 360 static ssize_t
 361 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 362 {
 363         struct scsi_disk *sdkp = to_scsi_disk(dev);
 364
 365         return sprintf(buf, "%u\n", sdkp->ATO);
 366 }
 367 static DEVICE_ATTR_RO(app_tag_own);
 368
 369 static ssize_t
 370 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
 371                        char *buf)
 372 {
 373         struct scsi_disk *sdkp = to_scsi_disk(dev);
 374
 375         return sprintf(buf, "%u\n", sdkp->lbpme);
 376 }
 377 static DEVICE_ATTR_RO(thin_provisioning);
 378
 379 /* sysfs_match_string() requires dense arrays */
 380 static const char *lbp_mode[] = {
 381         [SD_LBP_FULL]           = "full",
 382         [SD_LBP_UNMAP]          = "unmap",
 383         [SD_LBP_WS16]           = "writesame_16",
 384         [SD_LBP_WS10]           = "writesame_10",
 385         [SD_LBP_ZERO]           = "writesame_zero",
 386         [SD_LBP_DISABLE]        = "disabled",
 387 };
 388
 389 static ssize_t
 390 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
 391                        char *buf)
 392 {
 393         struct scsi_disk *sdkp = to_scsi_disk(dev);
 394
 395         return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 396 }
 397
 398 static ssize_t
 399 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
 400                         const char *buf, size_t count)
 401 {
 402         struct scsi_disk *sdkp = to_scsi_disk(dev);
 403         struct scsi_device *sdp = sdkp->device;
 404         int mode;
 405
 406         if (!capable(CAP_SYS_ADMIN))
 407                 return -EACCES;
 408
 409         if (sd_is_zoned(sdkp)) {
 410                 sd_config_discard(sdkp, SD_LBP_DISABLE);
 411                 return count;
 412         }
 413
 414         if (sdp->type != TYPE_DISK)
 415                 return -EINVAL;
 416
 417         mode = sysfs_match_string(lbp_mode, buf);
 418         if (mode < 0)
 419                 return -EINVAL;
 420
 421         sd_config_discard(sdkp, mode);
 422
 423         return count;
 424 }
 425 static DEVICE_ATTR_RW(provisioning_mode);
 426
 427 /* sysfs_match_string() requires dense arrays */
 428 static const char *zeroing_mode[] = {
 429         [SD_ZERO_WRITE]         = "write",
 430         [SD_ZERO_WS]            = "writesame",
 431         [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
 432         [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
 433 };
 434
 435 static ssize_t
 436 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
 437                   char *buf)
 438 {
 439         struct scsi_disk *sdkp = to_scsi_disk(dev);
 440
 441         return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
 442 }
 443
 444 static ssize_t
 445 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
 446                    const char *buf, size_t count)
 447 {
 448         struct scsi_disk *sdkp = to_scsi_disk(dev);
 449         int mode;
 450
 451         if (!capable(CAP_SYS_ADMIN))
 452                 return -EACCES;
 453
 454         mode = sysfs_match_string(zeroing_mode, buf);
 455         if (mode < 0)
 456                 return -EINVAL;
 457
 458         sdkp->zeroing_mode = mode;
 459
 460         return count;
 461 }
 462 static DEVICE_ATTR_RW(zeroing_mode);
 463
 464 static ssize_t
 465 max_medium_access_timeouts_show(struct device *dev,
 466                                 struct device_attribute *attr, char *buf)
 467 {
 468         struct scsi_disk *sdkp = to_scsi_disk(dev);
 469
 470         return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
 471 }
 472
 473 static ssize_t
 474 max_medium_access_timeouts_store(struct device *dev,
 475                                  struct device_attribute *attr, const char *buf,
 476                                  size_t count)
 477 {
 478         struct scsi_disk *sdkp = to_scsi_disk(dev);
 479         int err;
 480
 481         if (!capable(CAP_SYS_ADMIN))
 482                 return -EACCES;
 483
 484         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 485
 486         return err ? err : count;
 487 }
 488 static DEVICE_ATTR_RW(max_medium_access_timeouts);
 489
 490 static ssize_t
 491 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
 492                            char *buf)
 493 {
 494         struct scsi_disk *sdkp = to_scsi_disk(dev);
 495
 496         return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
 497 }
 498
 499 static ssize_t
 500 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
 501                             const char *buf, size_t count)
 502 {
 503         struct scsi_disk *sdkp = to_scsi_disk(dev);
 504         struct scsi_device *sdp = sdkp->device;
 505         unsigned long max;
 506         int err;
 507
 508         if (!capable(CAP_SYS_ADMIN))
 509                 return -EACCES;
 510
 511         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 512                 return -EINVAL;
 513
 514         err = kstrtoul(buf, 10, &max);
 515
 516         if (err)
 517                 return err;
 518
 519         if (max == 0)
 520                 sdp->no_write_same = 1;
 521         else if (max <= SD_MAX_WS16_BLOCKS) {
 522                 sdp->no_write_same = 0;
 523                 sdkp->max_ws_blocks = max;
 524         }
 525
 526         sd_config_write_same(sdkp);
 527
 528         return count;
 529 }
 530 static DEVICE_ATTR_RW(max_write_same_blocks);
 531
 532 static struct attribute *sd_disk_attrs[] = {
 533         &dev_attr_cache_type.attr,
 534         &dev_attr_FUA.attr,
 535         &dev_attr_allow_restart.attr,
 536         &dev_attr_manage_start_stop.attr,
 537         &dev_attr_protection_type.attr,
 538         &dev_attr_protection_mode.attr,
 539         &dev_attr_app_tag_own.attr,
 540         &dev_attr_thin_provisioning.attr,
 541         &dev_attr_provisioning_mode.attr,
 542         &dev_attr_zeroing_mode.attr,
 543         &dev_attr_max_write_same_blocks.attr,
 544         &dev_attr_max_medium_access_timeouts.attr,
 545         NULL,
 546 };
 547 ATTRIBUTE_GROUPS(sd_disk);
 548
 549 static struct class sd_disk_class = {
 550         .name           = "scsi_disk",
 551         .owner          = THIS_MODULE,
 552         .dev_release    = scsi_disk_release,
 553         .dev_groups     = sd_disk_groups,
 554 };
 555
 556 static const struct dev_pm_ops sd_pm_ops = {
 557         .suspend                = sd_suspend_system,
 558         .resume                 = sd_resume,
 559         .poweroff               = sd_suspend_system,
 560         .restore                = sd_resume,
 561         .runtime_suspend        = sd_suspend_runtime,
 562         .runtime_resume         = sd_resume,
 563 };
 564
 565 static struct scsi_driver sd_template = {
 566         .gendrv = {
 567                 .name           = "sd",
 568                 .owner          = THIS_MODULE,
 569                 .probe          = sd_probe,
 570                 .remove         = sd_remove,
 571                 .shutdown       = sd_shutdown,
 572                 .pm             = &sd_pm_ops,
 573         },
 574         .rescan                 = sd_rescan,
 575         .init_command           = sd_init_command,
 576         .uninit_command         = sd_uninit_command,
 577         .done                   = sd_done,
 578         .eh_action              = sd_eh_action,
 579         .eh_reset               = sd_eh_reset,
 580 };
 581
 582 /*
 583  * Dummy kobj_map->probe function.
 584  * The default ->probe function will call modprobe, which is
 585  * pointless as this module is already loaded.
 586  */
 587 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
 588 {
 589         return NULL;
 590 }
 591
 592 /*
 593  * Device no to disk mapping:
 594  *
 595  *       major         disc2     disc  p1
 596  *   |............|.............|....|....| <- dev_t
 597  *    31        20 19          8 7  4 3  0
 598  *
 599  * Inside a major, we have 16k disks, however mapped non-
 600  * contiguously. The first 16 disks are for major0, the next
 601  * ones with major1, ... Disk 256 is for major0 again, disk 272
 602  * for major1, ...
 603  * As we stay compatible with our numbering scheme, we can reuse
 604  * the well-know SCSI majors 8, 65--71, 136--143.
 605  */
 606 static int sd_major(int major_idx)
 607 {
 608         switch (major_idx) {
 609         case 0:
 610                 return SCSI_DISK0_MAJOR;
 611         case 1 ... 7:
 612                 return SCSI_DISK1_MAJOR + major_idx - 1;
 613         case 8 ... 15:
 614                 return SCSI_DISK8_MAJOR + major_idx - 8;
 615         default:
 616                 BUG();
 617                 return 0;       /* shut up gcc */
 618         }
 619 }
 620
 621 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 622 {
 623         struct scsi_disk *sdkp = NULL;
 624
 625         mutex_lock(&sd_ref_mutex);
 626
 627         if (disk->private_data) {
 628                 sdkp = scsi_disk(disk);
 629                 if (scsi_device_get(sdkp->device) == 0)
 630                         get_device(&sdkp->dev);
 631                 else
 632                         sdkp = NULL;
 633         }
 634         mutex_unlock(&sd_ref_mutex);
 635         return sdkp;
 636 }
 637
 638 static void scsi_disk_put(struct scsi_disk *sdkp)
 639 {
 640         struct scsi_device *sdev = sdkp->device;
 641
 642         mutex_lock(&sd_ref_mutex);
 643         put_device(&sdkp->dev);
 644         scsi_device_put(sdev);
 645         mutex_unlock(&sd_ref_mutex);
 646 }
 647
 648 #ifdef CONFIG_BLK_SED_OPAL
 649 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
 650                 size_t len, bool send)
 651 {
 652         struct scsi_device *sdev = data;
 653         u8 cdb[12] = { 0, };
 654         int ret;
 655
 656         cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
 657         cdb[1] = secp;
 658         put_unaligned_be16(spsp, &cdb[2]);
 659         put_unaligned_be32(len, &cdb[6]);
 660
 661         ret = scsi_execute_req(sdev, cdb,
 662                         send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
 663                         buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
 664         return ret <= 0 ? ret : -EIO;
 665 }
 666 #endif /* CONFIG_BLK_SED_OPAL */
 667
 668 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
 669                                            unsigned int dix, unsigned int dif)
 670 {
 671         struct bio *bio = scmd->request->bio;
 672         unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
 673         unsigned int protect = 0;
 674
 675         if (dix) {                              /* DIX Type 0, 1, 2, 3 */
 676                 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
 677                         scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
 678
 679                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 680                         scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
 681         }
 682
 683         if (dif != T10_PI_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
 684                 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
 685
 686                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 687                         scmd->prot_flags |= SCSI_PROT_REF_CHECK;
 688         }
 689
 690         if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
 691                 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
 692
 693                 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
 694                         protect = 3 << 5;       /* Disable target PI checking */
 695                 else
 696                         protect = 1 << 5;       /* Enable target PI checking */
 697         }
 698
 699         scsi_set_prot_op(scmd, prot_op);
 700         scsi_set_prot_type(scmd, dif);
 701         scmd->prot_flags &= sd_prot_flag_mask(prot_op);
 702
 703         return protect;
 704 }
 705
 706 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 707 {
 708         struct request_queue *q = sdkp->disk->queue;
 709         unsigned int logical_block_size = sdkp->device->sector_size;
 710         unsigned int max_blocks = 0;
 711
 712         q->limits.discard_alignment =
 713                 sdkp->unmap_alignment * logical_block_size;
 714         q->limits.discard_granularity =
 715                 max(sdkp->physical_block_size,
 716                     sdkp->unmap_granularity * logical_block_size);
 717         sdkp->provisioning_mode = mode;
 718
 719         switch (mode) {
 720
 721         case SD_LBP_FULL:
 722         case SD_LBP_DISABLE:
 723                 blk_queue_max_discard_sectors(q, 0);
 724                 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
 725                 return;
 726
 727         case SD_LBP_UNMAP:
 728                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 729                                           (u32)SD_MAX_WS16_BLOCKS);
 730                 break;
 731
 732         case SD_LBP_WS16:
 733                 if (sdkp->device->unmap_limit_for_ws)
 734                         max_blocks = sdkp->max_unmap_blocks;
 735                 else
 736                         max_blocks = sdkp->max_ws_blocks;
 737
 738                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
 739                 break;
 740
 741         case SD_LBP_WS10:
 742                 if (sdkp->device->unmap_limit_for_ws)
 743                         max_blocks = sdkp->max_unmap_blocks;
 744                 else
 745                         max_blocks = sdkp->max_ws_blocks;
 746
 747                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
 748                 break;
 749
 750         case SD_LBP_ZERO:
 751                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 752                                           (u32)SD_MAX_WS10_BLOCKS);
 753                 break;
 754         }
 755
 756         blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
 757         blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 758 }
 759
 760 static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
 761 {
 762         struct scsi_device *sdp = cmd->device;
 763         struct request *rq = cmd->request;
 764         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 765         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 766         unsigned int data_len = 24;
 767         char *buf;
 768
 769         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 770         if (!rq->special_vec.bv_page)
 771                 return BLK_STS_RESOURCE;
 772         clear_highpage(rq->special_vec.bv_page);
 773         rq->special_vec.bv_offset = 0;
 774         rq->special_vec.bv_len = data_len;
 775         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 776
 777         cmd->cmd_len = 10;
 778         cmd->cmnd[0] = UNMAP;
 779         cmd->cmnd[8] = 24;
 780
 781         buf = page_address(rq->special_vec.bv_page);
 782         put_unaligned_be16(6 + 16, &buf[0]);
 783         put_unaligned_be16(16, &buf[2]);
 784         put_unaligned_be64(sector, &buf[8]);
 785         put_unaligned_be32(nr_sectors, &buf[16]);
 786
 787         cmd->allowed = SD_MAX_RETRIES;
 788         cmd->transfersize = data_len;
 789         rq->timeout = SD_TIMEOUT;
 790         scsi_req(rq)->resid_len = data_len;
 791
 792         return scsi_init_io(cmd);
 793 }
 794
 795 static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
 796                 bool unmap)
 797 {
 798         struct scsi_device *sdp = cmd->device;
 799         struct request *rq = cmd->request;
 800         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 801         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 802         u32 data_len = sdp->sector_size;
 803
 804         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 805         if (!rq->special_vec.bv_page)
 806                 return BLK_STS_RESOURCE;
 807         clear_highpage(rq->special_vec.bv_page);
 808         rq->special_vec.bv_offset = 0;
 809         rq->special_vec.bv_len = data_len;
 810         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 811
 812         cmd->cmd_len = 16;
 813         cmd->cmnd[0] = WRITE_SAME_16;
 814         if (unmap)
 815                 cmd->cmnd[1] = 0x8; /* UNMAP */
 816         put_unaligned_be64(sector, &cmd->cmnd[2]);
 817         put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
 818
 819         cmd->allowed = SD_MAX_RETRIES;
 820         cmd->transfersize = data_len;
 821         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 822         scsi_req(rq)->resid_len = data_len;
 823
 824         return scsi_init_io(cmd);
 825 }
 826
 827 static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
 828                 bool unmap)
 829 {
 830         struct scsi_device *sdp = cmd->device;
 831         struct request *rq = cmd->request;
 832         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 833         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 834         u32 data_len = sdp->sector_size;
 835
 836         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 837         if (!rq->special_vec.bv_page)
 838                 return BLK_STS_RESOURCE;
 839         clear_highpage(rq->special_vec.bv_page);
 840         rq->special_vec.bv_offset = 0;
 841         rq->special_vec.bv_len = data_len;
 842         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 843
 844         cmd->cmd_len = 10;
 845         cmd->cmnd[0] = WRITE_SAME;
 846         if (unmap)
 847                 cmd->cmnd[1] = 0x8; /* UNMAP */
 848         put_unaligned_be32(sector, &cmd->cmnd[2]);
 849         put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
 850
 851         cmd->allowed = SD_MAX_RETRIES;
 852         cmd->transfersize = data_len;
 853         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 854         scsi_req(rq)->resid_len = data_len;
 855
 856         return scsi_init_io(cmd);
 857 }
 858
 859 static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
 860 {
 861         struct request *rq = cmd->request;
 862         struct scsi_device *sdp = cmd->device;
 863         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 864         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 865         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 866
 867         if (!(rq->cmd_flags & REQ_NOUNMAP)) {
 868                 switch (sdkp->zeroing_mode) {
 869                 case SD_ZERO_WS16_UNMAP:
 870                         return sd_setup_write_same16_cmnd(cmd, true);
 871                 case SD_ZERO_WS10_UNMAP:
 872                         return sd_setup_write_same10_cmnd(cmd, true);
 873                 }
 874         }
 875
 876         if (sdp->no_write_same)
 877                 return BLK_STS_TARGET;
 878
 879         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
 880                 return sd_setup_write_same16_cmnd(cmd, false);
 881
 882         return sd_setup_write_same10_cmnd(cmd, false);
 883 }
 884
 885 static void sd_config_write_same(struct scsi_disk *sdkp)
 886 {
 887         struct request_queue *q = sdkp->disk->queue;
 888         unsigned int logical_block_size = sdkp->device->sector_size;
 889
 890         if (sdkp->device->no_write_same) {
 891                 sdkp->max_ws_blocks = 0;
 892                 goto out;
 893         }
 894
 895         /* Some devices can not handle block counts above 0xffff despite
 896          * supporting WRITE SAME(16). Consequently we default to 64k
 897          * blocks per I/O unless the device explicitly advertises a
 898          * bigger limit.
 899          */
 900         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 901                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 902                                                    (u32)SD_MAX_WS16_BLOCKS);
 903         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 904                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 905                                                    (u32)SD_MAX_WS10_BLOCKS);
 906         else {
 907                 sdkp->device->no_write_same = 1;
 908                 sdkp->max_ws_blocks = 0;
 909         }
 910
 911         if (sdkp->lbprz && sdkp->lbpws)
 912                 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
 913         else if (sdkp->lbprz && sdkp->lbpws10)
 914                 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
 915         else if (sdkp->max_ws_blocks)
 916                 sdkp->zeroing_mode = SD_ZERO_WS;
 917         else
 918                 sdkp->zeroing_mode = SD_ZERO_WRITE;
 919
 920         if (sdkp->max_ws_blocks &&
 921             sdkp->physical_block_size > logical_block_size) {
 922                 /*
 923                  * Reporting a maximum number of blocks that is not aligned
 924                  * on the device physical size would cause a large write same
 925                  * request to be split into physically unaligned chunks by
 926                  * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same()
 927                  * even if the caller of these functions took care to align the
 928                  * large request. So make sure the maximum reported is aligned
 929                  * to the device physical block size. This is only an optional
 930                  * optimization for regular disks, but this is mandatory to
 931                  * avoid failure of large write same requests directed at
 932                  * sequential write required zones of host-managed ZBC disks.
 933                  */
 934                 sdkp->max_ws_blocks =
 935                         round_down(sdkp->max_ws_blocks,
 936                                    bytes_to_logical(sdkp->device,
 937                                                     sdkp->physical_block_size));
 938         }
 939
 940 out:
 941         blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
 942                                          (logical_block_size >> 9));
 943         blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
 944                                          (logical_block_size >> 9));
 945 }
 946
 947 /**
 948  * sd_setup_write_same_cmnd - write the same data to multiple blocks
 949  * @cmd: command to prepare
 950  *
 951  * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
 952  * the preference indicated by the target device.
 953  **/
 954 static blk_status_t sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
 955 {
 956         struct request *rq = cmd->request;
 957         struct scsi_device *sdp = cmd->device;
 958         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 959         struct bio *bio = rq->bio;
 960         sector_t sector = blk_rq_pos(rq);
 961         unsigned int nr_sectors = blk_rq_sectors(rq);
 962         unsigned int nr_bytes = blk_rq_bytes(rq);
 963         blk_status_t ret;
 964
 965         if (sdkp->device->no_write_same)
 966                 return BLK_STS_TARGET;
 967
 968         BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
 969
 970         sector >>= ilog2(sdp->sector_size) - 9;
 971         nr_sectors >>= ilog2(sdp->sector_size) - 9;
 972
 973         rq->timeout = SD_WRITE_SAME_TIMEOUT;
 974
 975         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
 976                 cmd->cmd_len = 16;
 977                 cmd->cmnd[0] = WRITE_SAME_16;
 978                 put_unaligned_be64(sector, &cmd->cmnd[2]);
 979                 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
 980         } else {
 981                 cmd->cmd_len = 10;
 982                 cmd->cmnd[0] = WRITE_SAME;
 983                 put_unaligned_be32(sector, &cmd->cmnd[2]);
 984                 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
 985         }
 986
 987         cmd->transfersize = sdp->sector_size;
 988         cmd->allowed = SD_MAX_RETRIES;
 989
 990         /*
 991          * For WRITE SAME the data transferred via the DATA OUT buffer is
 992          * different from the amount of data actually written to the target.
 993          *
 994          * We set up __data_len to the amount of data transferred via the
 995          * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
 996          * to transfer a single sector of data first, but then reset it to
 997          * the amount of data to be written right after so that the I/O path
 998          * knows how much to actually write.
 999          */
1000         rq->__data_len = sdp->sector_size;
1001         ret = scsi_init_io(cmd);
1002         rq->__data_len = nr_bytes;
1003
1004         return ret;
1005 }
1006
1007 static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
1008 {
1009         struct request *rq = cmd->request;
1010
1011         /* flush requests don't perform I/O, zero the S/G table */
1012         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1013
1014         cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1015         cmd->cmd_len = 10;
1016         cmd->transfersize = 0;
1017         cmd->allowed = SD_MAX_RETRIES;
1018
1019         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1020         return BLK_STS_OK;
1021 }
1022
1023 static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
1024 {
1025         struct request *rq = SCpnt->request;
1026         struct scsi_device *sdp = SCpnt->device;
1027         struct gendisk *disk = rq->rq_disk;
1028         struct scsi_disk *sdkp = scsi_disk(disk);
1029         sector_t block = blk_rq_pos(rq);
1030         sector_t threshold;
1031         unsigned int this_count = blk_rq_sectors(rq);
1032         unsigned int dif, dix;
1033         unsigned char protect;
1034         blk_status_t ret;
1035
1036         ret = scsi_init_io(SCpnt);
1037         if (ret != BLK_STS_OK)
1038                 return ret;
1039         WARN_ON_ONCE(SCpnt != rq->special);
1040
1041         SCSI_LOG_HLQUEUE(1,
1042                 scmd_printk(KERN_INFO, SCpnt,
1043                         "%s: block=%llu, count=%d\n",
1044                         __func__, (unsigned long long)block, this_count));
1045
1046         if (!sdp || !scsi_device_online(sdp) ||
1047             block + blk_rq_sectors(rq) > get_capacity(disk)) {
1048                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1049                                                 "Finishing %u sectors\n",
1050                                                 blk_rq_sectors(rq)));
1051                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1052                                                 "Retry with 0x%p\n", SCpnt));
1053                 return BLK_STS_IOERR;
1054         }
1055
1056         if (sdp->changed) {
1057                 /*
1058                  * quietly refuse to do anything to a changed disc until
1059                  * the changed bit has been reset
1060                  */
1061                 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
1062                 return BLK_STS_IOERR;
1063         }
1064
1065         /*
1066          * Some SD card readers can't handle multi-sector accesses which touch
1067          * the last one or two hardware sectors.  Split accesses as needed.
1068          */
1069         threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
1070                 (sdp->sector_size / 512);
1071
1072         if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
1073                 if (block < threshold) {
1074                         /* Access up to the threshold but not beyond */
1075                         this_count = threshold - block;
1076                 } else {
1077                         /* Access only a single hardware sector */
1078                         this_count = sdp->sector_size / 512;
1079                 }
1080         }
1081
1082         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
1083                                         (unsigned long long)block));
1084
1085         /*
1086          * If we have a 1K hardware sectorsize, prevent access to single
1087          * 512 byte sectors.  In theory we could handle this - in fact
1088          * the scsi cdrom driver must be able to handle this because
1089          * we typically use 1K blocksizes, and cdroms typically have
1090          * 2K hardware sectorsizes.  Of course, things are simpler
1091          * with the cdrom, since it is read-only.  For performance
1092          * reasons, the filesystems should be able to handle this
1093          * and not force the scsi disk driver to use bounce buffers
1094          * for this.
1095          */
1096         if (sdp->sector_size == 1024) {
1097                 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
1098                         scmd_printk(KERN_ERR, SCpnt,
1099                                     "Bad block number requested\n");
1100                         return BLK_STS_IOERR;
1101                 }
1102                 block = block >> 1;
1103                 this_count = this_count >> 1;
1104         }
1105         if (sdp->sector_size == 2048) {
1106                 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
1107                         scmd_printk(KERN_ERR, SCpnt,
1108                                     "Bad block number requested\n");
1109                         return BLK_STS_IOERR;
1110                 }
1111                 block = block >> 2;
1112                 this_count = this_count >> 2;
1113         }
1114         if (sdp->sector_size == 4096) {
1115                 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
1116                         scmd_printk(KERN_ERR, SCpnt,
1117                                     "Bad block number requested\n");
1118                         return BLK_STS_IOERR;
1119                 }
1120                 block = block >> 3;
1121                 this_count = this_count >> 3;
1122         }
1123         if (rq_data_dir(rq) == WRITE) {
1124                 SCpnt->cmnd[0] = WRITE_6;
1125
1126                 if (blk_integrity_rq(rq))
1127                         t10_pi_prepare(SCpnt->request, sdkp->protection_type);
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                 return BLK_STS_IOERR;
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))
1154                         return BLK_STS_RESOURCE;
1155
1156                 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1157                 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1158                 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1159                 SCpnt->cmnd[7] = 0x18;
1160                 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1161                 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1162
1163                 /* LBA */
1164                 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1165                 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1166                 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1167                 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1168                 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1169                 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1170                 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1171                 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1172
1173                 /* Expected Indirect LBA */
1174                 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1175                 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1176                 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1177                 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1178
1179                 /* Transfer length */
1180                 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1181                 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1182                 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1183                 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1184         } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1185                 SCpnt->cmnd[0] += READ_16 - READ_6;
1186                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1187                 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1188                 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1189                 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1190                 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1191                 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1192                 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1193                 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1194                 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1195                 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1196                 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1197                 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1198                 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1199                 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1200         } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1201                    scsi_device_protection(SCpnt->device) ||
1202                    SCpnt->device->use_10_for_rw) {
1203                 SCpnt->cmnd[0] += READ_10 - READ_6;
1204                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1205                 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1206                 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1207                 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1208                 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1209                 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1210                 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1211                 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1212         } else {
1213                 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1214                         /*
1215                          * This happens only if this drive failed
1216                          * 10byte rw command with ILLEGAL_REQUEST
1217                          * during operation and thus turned off
1218                          * use_10_for_rw.
1219                          */
1220                         scmd_printk(KERN_ERR, SCpnt,
1221                                     "FUA write on READ/WRITE(6) drive\n");
1222                         return BLK_STS_IOERR;
1223                 }
1224
1225                 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1226                 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1227                 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1228                 SCpnt->cmnd[4] = (unsigned char) this_count;
1229                 SCpnt->cmnd[5] = 0;
1230         }
1231         SCpnt->sdb.length = this_count * sdp->sector_size;
1232
1233         /*
1234          * We shouldn't disconnect in the middle of a sector, so with a dumb
1235          * host adapter, it's safe to assume that we can at least transfer
1236          * this many bytes between each connect / disconnect.
1237          */
1238         SCpnt->transfersize = sdp->sector_size;
1239         SCpnt->underflow = this_count << 9;
1240         SCpnt->allowed = SD_MAX_RETRIES;
1241
1242         /*
1243          * This indicates that the command is ready from our end to be
1244          * queued.
1245          */
1246         return BLK_STS_OK;
1247 }
1248
1249 static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
1250 {
1251         struct request *rq = cmd->request;
1252
1253         switch (req_op(rq)) {
1254         case REQ_OP_DISCARD:
1255                 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1256                 case SD_LBP_UNMAP:
1257                         return sd_setup_unmap_cmnd(cmd);
1258                 case SD_LBP_WS16:
1259                         return sd_setup_write_same16_cmnd(cmd, true);
1260                 case SD_LBP_WS10:
1261                         return sd_setup_write_same10_cmnd(cmd, true);
1262                 case SD_LBP_ZERO:
1263                         return sd_setup_write_same10_cmnd(cmd, false);
1264                 default:
1265                         return BLK_STS_TARGET;
1266                 }
1267         case REQ_OP_WRITE_ZEROES:
1268                 return sd_setup_write_zeroes_cmnd(cmd);
1269         case REQ_OP_WRITE_SAME:
1270                 return sd_setup_write_same_cmnd(cmd);
1271         case REQ_OP_FLUSH:
1272                 return sd_setup_flush_cmnd(cmd);
1273         case REQ_OP_READ:
1274         case REQ_OP_WRITE:
1275                 return sd_setup_read_write_cmnd(cmd);
1276         case REQ_OP_ZONE_RESET:
1277                 return sd_zbc_setup_reset_cmnd(cmd);
1278         default:
1279                 WARN_ON_ONCE(1);
1280                 return BLK_STS_NOTSUPP;
1281         }
1282 }
1283
1284 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1285 {
1286         struct request *rq = SCpnt->request;
1287         u8 *cmnd;
1288
1289         if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1290                 mempool_free(rq->special_vec.bv_page, sd_page_pool);
1291
1292         if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1293                 cmnd = SCpnt->cmnd;
1294                 SCpnt->cmnd = NULL;
1295                 SCpnt->cmd_len = 0;
1296                 mempool_free(cmnd, sd_cdb_pool);
1297         }
1298 }
1299
1300 /**
1301  *      sd_open - open a scsi disk device
1302  *      @bdev: Block device of the scsi disk to open
1303  *      @mode: FMODE_* mask
1304  *
1305  *      Returns 0 if successful. Returns a negated errno value in case
1306  *      of error.
1307  *
1308  *      Note: This can be called from a user context (e.g. fsck(1) )
1309  *      or from within the kernel (e.g. as a result of a mount(1) ).
1310  *      In the latter case @inode and @filp carry an abridged amount
1311  *      of information as noted above.
1312  *
1313  *      Locking: called with bdev->bd_mutex held.
1314  **/
1315 static int sd_open(struct block_device *bdev, fmode_t mode)
1316 {
1317         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1318         struct scsi_device *sdev;
1319         int retval;
1320
1321         if (!sdkp)
1322                 return -ENXIO;
1323
1324         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1325
1326         sdev = sdkp->device;
1327
1328         /*
1329          * If the device is in error recovery, wait until it is done.
1330          * If the device is offline, then disallow any access to it.
1331          */
1332         retval = -ENXIO;
1333         if (!scsi_block_when_processing_errors(sdev))
1334                 goto error_out;
1335
1336         if (sdev->removable || sdkp->write_prot)
1337                 check_disk_change(bdev);
1338
1339         /*
1340          * If the drive is empty, just let the open fail.
1341          */
1342         retval = -ENOMEDIUM;
1343         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1344                 goto error_out;
1345
1346         /*
1347          * If the device has the write protect tab set, have the open fail
1348          * if the user expects to be able to write to the thing.
1349          */
1350         retval = -EROFS;
1351         if (sdkp->write_prot && (mode & FMODE_WRITE))
1352                 goto error_out;
1353
1354         /*
1355          * It is possible that the disk changing stuff resulted in
1356          * the device being taken offline.  If this is the case,
1357          * report this to the user, and don't pretend that the
1358          * open actually succeeded.
1359          */
1360         retval = -ENXIO;
1361         if (!scsi_device_online(sdev))
1362                 goto error_out;
1363
1364         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1365                 if (scsi_block_when_processing_errors(sdev))
1366                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1367         }
1368
1369         return 0;
1370
1371 error_out:
1372         scsi_disk_put(sdkp);
1373         return retval;
1374 }
1375
1376 /**
1377  *      sd_release - invoked when the (last) close(2) is called on this
1378  *      scsi disk.
1379  *      @disk: disk to release
1380  *      @mode: FMODE_* mask
1381  *
1382  *      Returns 0.
1383  *
1384  *      Note: may block (uninterruptible) if error recovery is underway
1385  *      on this disk.
1386  *
1387  *      Locking: called with bdev->bd_mutex held.
1388  **/
1389 static void sd_release(struct gendisk *disk, fmode_t mode)
1390 {
1391         struct scsi_disk *sdkp = scsi_disk(disk);
1392         struct scsi_device *sdev = sdkp->device;
1393
1394         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1395
1396         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1397                 if (scsi_block_when_processing_errors(sdev))
1398                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1399         }
1400
1401         /*
1402          * XXX and what if there are packets in flight and this close()
1403          * XXX is followed by a "rmmod sd_mod"?
1404          */
1405
1406         scsi_disk_put(sdkp);
1407 }
1408
1409 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1410 {
1411         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1412         struct scsi_device *sdp = sdkp->device;
1413         struct Scsi_Host *host = sdp->host;
1414         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1415         int diskinfo[4];
1416
1417         /* default to most commonly used values */
1418         diskinfo[0] = 0x40;     /* 1 << 6 */
1419         diskinfo[1] = 0x20;     /* 1 << 5 */
1420         diskinfo[2] = capacity >> 11;
1421
1422         /* override with calculated, extended default, or driver values */
1423         if (host->hostt->bios_param)
1424                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1425         else
1426                 scsicam_bios_param(bdev, capacity, diskinfo);
1427
1428         geo->heads = diskinfo[0];
1429         geo->sectors = diskinfo[1];
1430         geo->cylinders = diskinfo[2];
1431         return 0;
1432 }
1433
1434 /**
1435  *      sd_ioctl - process an ioctl
1436  *      @bdev: target block device
1437  *      @mode: FMODE_* mask
1438  *      @cmd: ioctl command number
1439  *      @arg: this is third argument given to ioctl(2) system call.
1440  *      Often contains a pointer.
1441  *
1442  *      Returns 0 if successful (some ioctls return positive numbers on
1443  *      success as well). Returns a negated errno value in case of error.
1444  *
1445  *      Note: most ioctls are forward onto the block subsystem or further
1446  *      down in the scsi subsystem.
1447  **/
1448 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1449                     unsigned int cmd, unsigned long arg)
1450 {
1451         struct gendisk *disk = bdev->bd_disk;
1452         struct scsi_disk *sdkp = scsi_disk(disk);
1453         struct scsi_device *sdp = sdkp->device;
1454         void __user *p = (void __user *)arg;
1455         int error;
1456
1457         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1458                                     "cmd=0x%x\n", disk->disk_name, cmd));
1459
1460         error = scsi_verify_blk_ioctl(bdev, cmd);
1461         if (error < 0)
1462                 return error;
1463
1464         /*
1465          * If we are in the middle of error recovery, don't let anyone
1466          * else try and use this device.  Also, if error recovery fails, it
1467          * may try and take the device offline, in which case all further
1468          * access to the device is prohibited.
1469          */
1470         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1471                         (mode & FMODE_NDELAY) != 0);
1472         if (error)
1473                 goto out;
1474
1475         if (is_sed_ioctl(cmd))
1476                 return sed_ioctl(sdkp->opal_dev, cmd, p);
1477
1478         /*
1479          * Send SCSI addressing ioctls directly to mid level, send other
1480          * ioctls to block level and then onto mid level if they can't be
1481          * resolved.
1482          */
1483         switch (cmd) {
1484                 case SCSI_IOCTL_GET_IDLUN:
1485                 case SCSI_IOCTL_GET_BUS_NUMBER:
1486                         error = scsi_ioctl(sdp, cmd, p);
1487                         break;
1488                 default:
1489                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1490                         if (error != -ENOTTY)
1491                                 break;
1492                         error = scsi_ioctl(sdp, cmd, p);
1493                         break;
1494         }
1495 out:
1496         return error;
1497 }
1498
1499 static void set_media_not_present(struct scsi_disk *sdkp)
1500 {
1501         if (sdkp->media_present)
1502                 sdkp->device->changed = 1;
1503
1504         if (sdkp->device->removable) {
1505                 sdkp->media_present = 0;
1506                 sdkp->capacity = 0;
1507         }
1508 }
1509
1510 static int media_not_present(struct scsi_disk *sdkp,
1511                              struct scsi_sense_hdr *sshdr)
1512 {
1513         if (!scsi_sense_valid(sshdr))
1514                 return 0;
1515
1516         /* not invoked for commands that could return deferred errors */
1517         switch (sshdr->sense_key) {
1518         case UNIT_ATTENTION:
1519         case NOT_READY:
1520                 /* medium not present */
1521                 if (sshdr->asc == 0x3A) {
1522                         set_media_not_present(sdkp);
1523                         return 1;
1524                 }
1525         }
1526         return 0;
1527 }
1528
1529 /**
1530  *      sd_check_events - check media events
1531  *      @disk: kernel device descriptor
1532  *      @clearing: disk events currently being cleared
1533  *
1534  *      Returns mask of DISK_EVENT_*.
1535  *
1536  *      Note: this function is invoked from the block subsystem.
1537  **/
1538 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1539 {
1540         struct scsi_disk *sdkp = scsi_disk_get(disk);
1541         struct scsi_device *sdp;
1542         int retval;
1543
1544         if (!sdkp)
1545                 return 0;
1546
1547         sdp = sdkp->device;
1548         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1549
1550         /*
1551          * If the device is offline, don't send any commands - just pretend as
1552          * if the command failed.  If the device ever comes back online, we
1553          * can deal with it then.  It is only because of unrecoverable errors
1554          * that we would ever take a device offline in the first place.
1555          */
1556         if (!scsi_device_online(sdp)) {
1557                 set_media_not_present(sdkp);
1558                 goto out;
1559         }
1560
1561         /*
1562          * Using TEST_UNIT_READY enables differentiation between drive with
1563          * no cartridge loaded - NOT READY, drive with changed cartridge -
1564          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1565          *
1566          * Drives that auto spin down. eg iomega jaz 1G, will be started
1567          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1568          * sd_revalidate() is called.
1569          */
1570         if (scsi_block_when_processing_errors(sdp)) {
1571                 struct scsi_sense_hdr sshdr = { 0, };
1572
1573                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1574                                               &sshdr);
1575
1576                 /* failed to execute TUR, assume media not present */
1577                 if (host_byte(retval)) {
1578                         set_media_not_present(sdkp);
1579                         goto out;
1580                 }
1581
1582                 if (media_not_present(sdkp, &sshdr))
1583                         goto out;
1584         }
1585
1586         /*
1587          * For removable scsi disk we have to recognise the presence
1588          * of a disk in the drive.
1589          */
1590         if (!sdkp->media_present)
1591                 sdp->changed = 1;
1592         sdkp->media_present = 1;
1593 out:
1594         /*
1595          * sdp->changed is set under the following conditions:
1596          *
1597          *      Medium present state has changed in either direction.
1598          *      Device has indicated UNIT_ATTENTION.
1599          */
1600         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1601         sdp->changed = 0;
1602         scsi_disk_put(sdkp);
1603         return retval;
1604 }
1605
1606 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1607 {
1608         int retries, res;
1609         struct scsi_device *sdp = sdkp->device;
1610         const int timeout = sdp->request_queue->rq_timeout
1611                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1612         struct scsi_sense_hdr my_sshdr;
1613
1614         if (!scsi_device_online(sdp))
1615                 return -ENODEV;
1616
1617         /* caller might not be interested in sense, but we need it */
1618         if (!sshdr)
1619                 sshdr = &my_sshdr;
1620
1621         for (retries = 3; retries > 0; --retries) {
1622                 unsigned char cmd[10] = { 0 };
1623
1624                 cmd[0] = SYNCHRONIZE_CACHE;
1625                 /*
1626                  * Leave the rest of the command zero to indicate
1627                  * flush everything.
1628                  */
1629                 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1630                                 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1631                 if (res == 0)
1632                         break;
1633         }
1634
1635         if (res) {
1636                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1637
1638                 if (driver_byte(res) == DRIVER_SENSE)
1639                         sd_print_sense_hdr(sdkp, sshdr);
1640
1641                 /* we need to evaluate the error return  */
1642                 if (scsi_sense_valid(sshdr) &&
1643                         (sshdr->asc == 0x3a ||  /* medium not present */
1644                          sshdr->asc == 0x20))   /* invalid command */
1645                                 /* this is no error here */
1646                                 return 0;
1647
1648                 switch (host_byte(res)) {
1649                 /* ignore errors due to racing a disconnection */
1650                 case DID_BAD_TARGET:
1651                 case DID_NO_CONNECT:
1652                         return 0;
1653                 /* signal the upper layer it might try again */
1654                 case DID_BUS_BUSY:
1655                 case DID_IMM_RETRY:
1656                 case DID_REQUEUE:
1657                 case DID_SOFT_ERROR:
1658                         return -EBUSY;
1659                 default:
1660                         return -EIO;
1661                 }
1662         }
1663         return 0;
1664 }
1665
1666 static void sd_rescan(struct device *dev)
1667 {
1668         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1669
1670         revalidate_disk(sdkp->disk);
1671 }
1672
1673
1674 #ifdef CONFIG_COMPAT
1675 /*
1676  * This gets directly called from VFS. When the ioctl
1677  * is not recognized we go back to the other translation paths.
1678  */
1679 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1680                            unsigned int cmd, unsigned long arg)
1681 {
1682         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1683         int error;
1684
1685         error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1686                         (mode & FMODE_NDELAY) != 0);
1687         if (error)
1688                 return error;
1689
1690         /*
1691          * Let the static ioctl translation table take care of it.
1692          */
1693         if (!sdev->host->hostt->compat_ioctl)
1694                 return -ENOIOCTLCMD;
1695         return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1696 }
1697 #endif
1698
1699 static char sd_pr_type(enum pr_type type)
1700 {
1701         switch (type) {
1702         case PR_WRITE_EXCLUSIVE:
1703                 return 0x01;
1704         case PR_EXCLUSIVE_ACCESS:
1705                 return 0x03;
1706         case PR_WRITE_EXCLUSIVE_REG_ONLY:
1707                 return 0x05;
1708         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1709                 return 0x06;
1710         case PR_WRITE_EXCLUSIVE_ALL_REGS:
1711                 return 0x07;
1712         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1713                 return 0x08;
1714         default:
1715                 return 0;
1716         }
1717 };
1718
1719 static int sd_pr_command(struct block_device *bdev, u8 sa,
1720                 u64 key, u64 sa_key, u8 type, u8 flags)
1721 {
1722         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1723         struct scsi_sense_hdr sshdr;
1724         int result;
1725         u8 cmd[16] = { 0, };
1726         u8 data[24] = { 0, };
1727
1728         cmd[0] = PERSISTENT_RESERVE_OUT;
1729         cmd[1] = sa;
1730         cmd[2] = type;
1731         put_unaligned_be32(sizeof(data), &cmd[5]);
1732
1733         put_unaligned_be64(key, &data[0]);
1734         put_unaligned_be64(sa_key, &data[8]);
1735         data[20] = flags;
1736
1737         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1738                         &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1739
1740         if (driver_byte(result) == DRIVER_SENSE &&
1741             scsi_sense_valid(&sshdr)) {
1742                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1743                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1744         }
1745
1746         return result;
1747 }
1748
1749 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1750                 u32 flags)
1751 {
1752         if (flags & ~PR_FL_IGNORE_KEY)
1753                 return -EOPNOTSUPP;
1754         return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1755                         old_key, new_key, 0,
1756                         (1 << 0) /* APTPL */);
1757 }
1758
1759 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1760                 u32 flags)
1761 {
1762         if (flags)
1763                 return -EOPNOTSUPP;
1764         return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1765 }
1766
1767 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1768 {
1769         return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1770 }
1771
1772 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1773                 enum pr_type type, bool abort)
1774 {
1775         return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1776                              sd_pr_type(type), 0);
1777 }
1778
1779 static int sd_pr_clear(struct block_device *bdev, u64 key)
1780 {
1781         return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1782 }
1783
1784 static const struct pr_ops sd_pr_ops = {
1785         .pr_register    = sd_pr_register,
1786         .pr_reserve     = sd_pr_reserve,
1787         .pr_release     = sd_pr_release,
1788         .pr_preempt     = sd_pr_preempt,
1789         .pr_clear       = sd_pr_clear,
1790 };
1791
1792 static const struct block_device_operations sd_fops = {
1793         .owner                  = THIS_MODULE,
1794         .open                   = sd_open,
1795         .release                = sd_release,
1796         .ioctl                  = sd_ioctl,
1797         .getgeo                 = sd_getgeo,
1798 #ifdef CONFIG_COMPAT
1799         .compat_ioctl           = sd_compat_ioctl,
1800 #endif
1801         .check_events           = sd_check_events,
1802         .revalidate_disk        = sd_revalidate_disk,
1803         .unlock_native_capacity = sd_unlock_native_capacity,
1804         .report_zones           = sd_zbc_report_zones,
1805         .pr_ops                 = &sd_pr_ops,
1806 };
1807
1808 /**
1809  *      sd_eh_reset - reset error handling callback
1810  *      @scmd:          sd-issued command that has failed
1811  *
1812  *      This function is called by the SCSI midlayer before starting
1813  *      SCSI EH. When counting medium access failures we have to be
1814  *      careful to register it only only once per device and SCSI EH run;
1815  *      there might be several timed out commands which will cause the
1816  *      'max_medium_access_timeouts' counter to trigger after the first
1817  *      SCSI EH run already and set the device to offline.
1818  *      So this function resets the internal counter before starting SCSI EH.
1819  **/
1820 static void sd_eh_reset(struct scsi_cmnd *scmd)
1821 {
1822         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1823
1824         /* New SCSI EH run, reset gate variable */
1825         sdkp->ignore_medium_access_errors = false;
1826 }
1827
1828 /**
1829  *      sd_eh_action - error handling callback
1830  *      @scmd:          sd-issued command that has failed
1831  *      @eh_disp:       The recovery disposition suggested by the midlayer
1832  *
1833  *      This function is called by the SCSI midlayer upon completion of an
1834  *      error test command (currently TEST UNIT READY). The result of sending
1835  *      the eh command is passed in eh_disp.  We're looking for devices that
1836  *      fail medium access commands but are OK with non access commands like
1837  *      test unit ready (so wrongly see the device as having a successful
1838  *      recovery)
1839  **/
1840 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1841 {
1842         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1843         struct scsi_device *sdev = scmd->device;
1844
1845         if (!scsi_device_online(sdev) ||
1846             !scsi_medium_access_command(scmd) ||
1847             host_byte(scmd->result) != DID_TIME_OUT ||
1848             eh_disp != SUCCESS)
1849                 return eh_disp;
1850
1851         /*
1852          * The device has timed out executing a medium access command.
1853          * However, the TEST UNIT READY command sent during error
1854          * handling completed successfully. Either the device is in the
1855          * process of recovering or has it suffered an internal failure
1856          * that prevents access to the storage medium.
1857          */
1858         if (!sdkp->ignore_medium_access_errors) {
1859                 sdkp->medium_access_timed_out++;
1860                 sdkp->ignore_medium_access_errors = true;
1861         }
1862
1863         /*
1864          * If the device keeps failing read/write commands but TEST UNIT
1865          * READY always completes successfully we assume that medium
1866          * access is no longer possible and take the device offline.
1867          */
1868         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1869                 scmd_printk(KERN_ERR, scmd,
1870                             "Medium access timeout failure. Offlining disk!\n");
1871                 mutex_lock(&sdev->state_mutex);
1872                 scsi_device_set_state(sdev, SDEV_OFFLINE);
1873                 mutex_unlock(&sdev->state_mutex);
1874
1875                 return SUCCESS;
1876         }
1877
1878         return eh_disp;
1879 }
1880
1881 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1882 {
1883         struct request *req = scmd->request;
1884         struct scsi_device *sdev = scmd->device;
1885         unsigned int transferred, good_bytes;
1886         u64 start_lba, end_lba, bad_lba;
1887
1888         /*
1889          * Some commands have a payload smaller than the device logical
1890          * block size (e.g. INQUIRY on a 4K disk).
1891          */
1892         if (scsi_bufflen(scmd) <= sdev->sector_size)
1893                 return 0;
1894
1895         /* Check if we have a 'bad_lba' information */
1896         if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1897                                      SCSI_SENSE_BUFFERSIZE,
1898                                      &bad_lba))
1899                 return 0;
1900
1901         /*
1902          * If the bad lba was reported incorrectly, we have no idea where
1903          * the error is.
1904          */
1905         start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1906         end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1907         if (bad_lba < start_lba || bad_lba >= end_lba)
1908                 return 0;
1909
1910         /*
1911          * resid is optional but mostly filled in.  When it's unused,
1912          * its value is zero, so we assume the whole buffer transferred
1913          */
1914         transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1915
1916         /* This computation should always be done in terms of the
1917          * resolution of the device's medium.
1918          */
1919         good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1920
1921         return min(good_bytes, transferred);
1922 }
1923
1924 /**
1925  *      sd_done - bottom half handler: called when the lower level
1926  *      driver has completed (successfully or otherwise) a scsi command.
1927  *      @SCpnt: mid-level's per command structure.
1928  *
1929  *      Note: potentially run from within an ISR. Must not block.
1930  **/
1931 static int sd_done(struct scsi_cmnd *SCpnt)
1932 {
1933         int result = SCpnt->result;
1934         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1935         unsigned int sector_size = SCpnt->device->sector_size;
1936         unsigned int resid;
1937         struct scsi_sense_hdr sshdr;
1938         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1939         struct request *req = SCpnt->request;
1940         int sense_valid = 0;
1941         int sense_deferred = 0;
1942
1943         switch (req_op(req)) {
1944         case REQ_OP_DISCARD:
1945         case REQ_OP_WRITE_ZEROES:
1946         case REQ_OP_WRITE_SAME:
1947         case REQ_OP_ZONE_RESET:
1948                 if (!result) {
1949                         good_bytes = blk_rq_bytes(req);
1950                         scsi_set_resid(SCpnt, 0);
1951                 } else {
1952                         good_bytes = 0;
1953                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1954                 }
1955                 break;
1956         default:
1957                 /*
1958                  * In case of bogus fw or device, we could end up having
1959                  * an unaligned partial completion. Check this here and force
1960                  * alignment.
1961                  */
1962                 resid = scsi_get_resid(SCpnt);
1963                 if (resid & (sector_size - 1)) {
1964                         sd_printk(KERN_INFO, sdkp,
1965                                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1966                                 resid, sector_size);
1967                         resid = min(scsi_bufflen(SCpnt),
1968                                     round_up(resid, sector_size));
1969                         scsi_set_resid(SCpnt, resid);
1970                 }
1971         }
1972
1973         if (result) {
1974                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1975                 if (sense_valid)
1976                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1977         }
1978         sdkp->medium_access_timed_out = 0;
1979
1980         if (driver_byte(result) != DRIVER_SENSE &&
1981             (!sense_valid || sense_deferred))
1982                 goto out;
1983
1984         switch (sshdr.sense_key) {
1985         case HARDWARE_ERROR:
1986         case MEDIUM_ERROR:
1987                 good_bytes = sd_completed_bytes(SCpnt);
1988                 break;
1989         case RECOVERED_ERROR:
1990                 good_bytes = scsi_bufflen(SCpnt);
1991                 break;
1992         case NO_SENSE:
1993                 /* This indicates a false check condition, so ignore it.  An
1994                  * unknown amount of data was transferred so treat it as an
1995                  * error.
1996                  */
1997                 SCpnt->result = 0;
1998                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1999                 break;
2000         case ABORTED_COMMAND:
2001                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
2002                         good_bytes = sd_completed_bytes(SCpnt);
2003                 break;
2004         case ILLEGAL_REQUEST:
2005                 switch (sshdr.asc) {
2006                 case 0x10:      /* DIX: Host detected corruption */
2007                         good_bytes = sd_completed_bytes(SCpnt);
2008                         break;
2009                 case 0x20:      /* INVALID COMMAND OPCODE */
2010                 case 0x24:      /* INVALID FIELD IN CDB */
2011                         switch (SCpnt->cmnd[0]) {
2012                         case UNMAP:
2013                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2014                                 break;
2015                         case WRITE_SAME_16:
2016                         case WRITE_SAME:
2017                                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2018                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
2019                                 } else {
2020                                         sdkp->device->no_write_same = 1;
2021                                         sd_config_write_same(sdkp);
2022                                         req->rq_flags |= RQF_QUIET;
2023                                 }
2024                                 break;
2025                         }
2026                 }
2027                 break;
2028         default:
2029                 break;
2030         }
2031
2032  out:
2033         if (sd_is_zoned(sdkp))
2034                 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2035
2036         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2037                                            "sd_done: completed %d of %d bytes\n",
2038                                            good_bytes, scsi_bufflen(SCpnt)));
2039
2040         if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt) &&
2041             good_bytes)
2042                 t10_pi_complete(SCpnt->request, sdkp->protection_type,
2043                                 good_bytes / scsi_prot_interval(SCpnt));
2044
2045         return good_bytes;
2046 }
2047
2048 /*
2049  * spinup disk - called only in sd_revalidate_disk()
2050  */
2051 static void
2052 sd_spinup_disk(struct scsi_disk *sdkp)
2053 {
2054         unsigned char cmd[10];
2055         unsigned long spintime_expire = 0;
2056         int retries, spintime;
2057         unsigned int the_result;
2058         struct scsi_sense_hdr sshdr;
2059         int sense_valid = 0;
2060
2061         spintime = 0;
2062
2063         /* Spin up drives, as required.  Only do this at boot time */
2064         /* Spinup needs to be done for module loads too. */
2065         do {
2066                 retries = 0;
2067
2068                 do {
2069                         cmd[0] = TEST_UNIT_READY;
2070                         memset((void *) &cmd[1], 0, 9);
2071
2072                         the_result = scsi_execute_req(sdkp->device, cmd,
2073                                                       DMA_NONE, NULL, 0,
2074                                                       &sshdr, SD_TIMEOUT,
2075                                                       SD_MAX_RETRIES, NULL);
2076
2077                         /*
2078                          * If the drive has indicated to us that it
2079                          * doesn't have any media in it, don't bother
2080                          * with any more polling.
2081                          */
2082                         if (media_not_present(sdkp, &sshdr))
2083                                 return;
2084
2085                         if (the_result)
2086                                 sense_valid = scsi_sense_valid(&sshdr);
2087                         retries++;
2088                 } while (retries < 3 &&
2089                          (!scsi_status_is_good(the_result) ||
2090                           ((driver_byte(the_result) == DRIVER_SENSE) &&
2091                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2092
2093                 if (driver_byte(the_result) != DRIVER_SENSE) {
2094                         /* no sense, TUR either succeeded or failed
2095                          * with a status error */
2096                         if(!spintime && !scsi_status_is_good(the_result)) {
2097                                 sd_print_result(sdkp, "Test Unit Ready failed",
2098                                                 the_result);
2099                         }
2100                         break;
2101                 }
2102
2103                 /*
2104                  * The device does not want the automatic start to be issued.
2105                  */
2106                 if (sdkp->device->no_start_on_add)
2107                         break;
2108
2109                 if (sense_valid && sshdr.sense_key == NOT_READY) {
2110                         if (sshdr.asc == 4 && sshdr.ascq == 3)
2111                                 break;  /* manual intervention required */
2112                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2113                                 break;  /* standby */
2114                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2115                                 break;  /* unavailable */
2116                         if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2117                                 break;  /* sanitize in progress */
2118                         /*
2119                          * Issue command to spin up drive when not ready
2120                          */
2121                         if (!spintime) {
2122                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2123                                 cmd[0] = START_STOP;
2124                                 cmd[1] = 1;     /* Return immediately */
2125                                 memset((void *) &cmd[2], 0, 8);
2126                                 cmd[4] = 1;     /* Start spin cycle */
2127                                 if (sdkp->device->start_stop_pwr_cond)
2128                                         cmd[4] |= 1 << 4;
2129                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2130                                                  NULL, 0, &sshdr,
2131                                                  SD_TIMEOUT, SD_MAX_RETRIES,
2132                                                  NULL);
2133                                 spintime_expire = jiffies + 100 * HZ;
2134                                 spintime = 1;
2135                         }
2136                         /* Wait 1 second for next try */
2137                         msleep(1000);
2138                         printk(KERN_CONT ".");
2139
2140                 /*
2141                  * Wait for USB flash devices with slow firmware.
2142                  * Yes, this sense key/ASC combination shouldn't
2143                  * occur here.  It's characteristic of these devices.
2144                  */
2145                 } else if (sense_valid &&
2146                                 sshdr.sense_key == UNIT_ATTENTION &&
2147                                 sshdr.asc == 0x28) {
2148                         if (!spintime) {
2149                                 spintime_expire = jiffies + 5 * HZ;
2150                                 spintime = 1;
2151                         }
2152                         /* Wait 1 second for next try */
2153                         msleep(1000);
2154                 } else {
2155                         /* we don't understand the sense code, so it's
2156                          * probably pointless to loop */
2157                         if(!spintime) {
2158                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2159                                 sd_print_sense_hdr(sdkp, &sshdr);
2160                         }
2161                         break;
2162                 }
2163
2164         } while (spintime && time_before_eq(jiffies, spintime_expire));
2165
2166         if (spintime) {
2167                 if (scsi_status_is_good(the_result))
2168                         printk(KERN_CONT "ready\n");
2169                 else
2170                         printk(KERN_CONT "not responding...\n");
2171         }
2172 }
2173
2174 /*
2175  * Determine whether disk supports Data Integrity Field.
2176  */
2177 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2178 {
2179         struct scsi_device *sdp = sdkp->device;
2180         u8 type;
2181         int ret = 0;
2182
2183         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2184                 return ret;
2185
2186         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2187
2188         if (type > T10_PI_TYPE3_PROTECTION)
2189                 ret = -ENODEV;
2190         else if (scsi_host_dif_capable(sdp->host, type))
2191                 ret = 1;
2192
2193         if (sdkp->first_scan || type != sdkp->protection_type)
2194                 switch (ret) {
2195                 case -ENODEV:
2196                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2197                                   " protection type %u. Disabling disk!\n",
2198                                   type);
2199                         break;
2200                 case 1:
2201                         sd_printk(KERN_NOTICE, sdkp,
2202                                   "Enabling DIF Type %u protection\n", type);
2203                         break;
2204                 case 0:
2205                         sd_printk(KERN_NOTICE, sdkp,
2206                                   "Disabling DIF Type %u protection\n", type);
2207                         break;
2208                 }
2209
2210         sdkp->protection_type = type;
2211
2212         return ret;
2213 }
2214
2215 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2216                         struct scsi_sense_hdr *sshdr, int sense_valid,
2217                         int the_result)
2218 {
2219         if (driver_byte(the_result) == DRIVER_SENSE)
2220                 sd_print_sense_hdr(sdkp, sshdr);
2221         else
2222                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2223
2224         /*
2225          * Set dirty bit for removable devices if not ready -
2226          * sometimes drives will not report this properly.
2227          */
2228         if (sdp->removable &&
2229             sense_valid && sshdr->sense_key == NOT_READY)
2230                 set_media_not_present(sdkp);
2231
2232         /*
2233          * We used to set media_present to 0 here to indicate no media
2234          * in the drive, but some drives fail read capacity even with
2235          * media present, so we can't do that.
2236          */
2237         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2238 }
2239
2240 #define RC16_LEN 32
2241 #if RC16_LEN > SD_BUF_SIZE
2242 #error RC16_LEN must not be more than SD_BUF_SIZE
2243 #endif
2244
2245 #define READ_CAPACITY_RETRIES_ON_RESET  10
2246
2247 /*
2248  * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
2249  * and the reported logical block size is bigger than 512 bytes. Note
2250  * that last_sector is a u64 and therefore logical_to_sectors() is not
2251  * applicable.
2252  */
2253 static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
2254 {
2255         u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
2256
2257         if (sizeof(sector_t) == 4 && last_sector > U32_MAX)
2258                 return false;
2259
2260         return true;
2261 }
2262
2263 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2264                                                 unsigned char *buffer)
2265 {
2266         unsigned char cmd[16];
2267         struct scsi_sense_hdr sshdr;
2268         int sense_valid = 0;
2269         int the_result;
2270         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2271         unsigned int alignment;
2272         unsigned long long lba;
2273         unsigned sector_size;
2274
2275         if (sdp->no_read_capacity_16)
2276                 return -EINVAL;
2277
2278         do {
2279                 memset(cmd, 0, 16);
2280                 cmd[0] = SERVICE_ACTION_IN_16;
2281                 cmd[1] = SAI_READ_CAPACITY_16;
2282                 cmd[13] = RC16_LEN;
2283                 memset(buffer, 0, RC16_LEN);
2284
2285                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2286                                         buffer, RC16_LEN, &sshdr,
2287                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2288
2289                 if (media_not_present(sdkp, &sshdr))
2290                         return -ENODEV;
2291
2292                 if (the_result) {
2293                         sense_valid = scsi_sense_valid(&sshdr);
2294                         if (sense_valid &&
2295                             sshdr.sense_key == ILLEGAL_REQUEST &&
2296                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2297                             sshdr.ascq == 0x00)
2298                                 /* Invalid Command Operation Code or
2299                                  * Invalid Field in CDB, just retry
2300                                  * silently with RC10 */
2301                                 return -EINVAL;
2302                         if (sense_valid &&
2303                             sshdr.sense_key == UNIT_ATTENTION &&
2304                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2305                                 /* Device reset might occur several times,
2306                                  * give it one more chance */
2307                                 if (--reset_retries > 0)
2308                                         continue;
2309                 }
2310                 retries--;
2311
2312         } while (the_result && retries);
2313
2314         if (the_result) {
2315                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2316                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2317                 return -EINVAL;
2318         }
2319
2320         sector_size = get_unaligned_be32(&buffer[8]);
2321         lba = get_unaligned_be64(&buffer[0]);
2322
2323         if (sd_read_protection_type(sdkp, buffer) < 0) {
2324                 sdkp->capacity = 0;
2325                 return -ENODEV;
2326         }
2327
2328         if (!sd_addressable_capacity(lba, sector_size)) {
2329                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2330                         "kernel compiled with support for large block "
2331                         "devices.\n");
2332                 sdkp->capacity = 0;
2333                 return -EOVERFLOW;
2334         }
2335
2336         /* Logical blocks per physical block exponent */
2337         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2338
2339         /* RC basis */
2340         sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2341
2342         /* Lowest aligned logical block */
2343         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2344         blk_queue_alignment_offset(sdp->request_queue, alignment);
2345         if (alignment && sdkp->first_scan)
2346                 sd_printk(KERN_NOTICE, sdkp,
2347                           "physical block alignment offset: %u\n", alignment);
2348
2349         if (buffer[14] & 0x80) { /* LBPME */
2350                 sdkp->lbpme = 1;
2351
2352                 if (buffer[14] & 0x40) /* LBPRZ */
2353                         sdkp->lbprz = 1;
2354
2355                 sd_config_discard(sdkp, SD_LBP_WS16);
2356         }
2357
2358         sdkp->capacity = lba + 1;
2359         return sector_size;
2360 }
2361
2362 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2363                                                 unsigned char *buffer)
2364 {
2365         unsigned char cmd[16];
2366         struct scsi_sense_hdr sshdr;
2367         int sense_valid = 0;
2368         int the_result;
2369         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2370         sector_t lba;
2371         unsigned sector_size;
2372
2373         do {
2374                 cmd[0] = READ_CAPACITY;
2375                 memset(&cmd[1], 0, 9);
2376                 memset(buffer, 0, 8);
2377
2378                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2379                                         buffer, 8, &sshdr,
2380                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2381
2382                 if (media_not_present(sdkp, &sshdr))
2383                         return -ENODEV;
2384
2385                 if (the_result) {
2386                         sense_valid = scsi_sense_valid(&sshdr);
2387                         if (sense_valid &&
2388                             sshdr.sense_key == UNIT_ATTENTION &&
2389                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2390                                 /* Device reset might occur several times,
2391                                  * give it one more chance */
2392                                 if (--reset_retries > 0)
2393                                         continue;
2394                 }
2395                 retries--;
2396
2397         } while (the_result && retries);
2398
2399         if (the_result) {
2400                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2401                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2402                 return -EINVAL;
2403         }
2404
2405         sector_size = get_unaligned_be32(&buffer[4]);
2406         lba = get_unaligned_be32(&buffer[0]);
2407
2408         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2409                 /* Some buggy (usb cardreader) devices return an lba of
2410                    0xffffffff when the want to report a size of 0 (with
2411                    which they really mean no media is present) */
2412                 sdkp->capacity = 0;
2413                 sdkp->physical_block_size = sector_size;
2414                 return sector_size;
2415         }
2416
2417         if (!sd_addressable_capacity(lba, sector_size)) {
2418                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2419                         "kernel compiled with support for large block "
2420                         "devices.\n");
2421                 sdkp->capacity = 0;
2422                 return -EOVERFLOW;
2423         }
2424
2425         sdkp->capacity = lba + 1;
2426         sdkp->physical_block_size = sector_size;
2427         return sector_size;
2428 }
2429
2430 static int sd_try_rc16_first(struct scsi_device *sdp)
2431 {
2432         if (sdp->host->max_cmd_len < 16)
2433                 return 0;
2434         if (sdp->try_rc_10_first)
2435                 return 0;
2436         if (sdp->scsi_level > SCSI_SPC_2)
2437                 return 1;
2438         if (scsi_device_protection(sdp))
2439                 return 1;
2440         return 0;
2441 }
2442
2443 /*
2444  * read disk capacity
2445  */
2446 static void
2447 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2448 {
2449         int sector_size;
2450         struct scsi_device *sdp = sdkp->device;
2451
2452         if (sd_try_rc16_first(sdp)) {
2453                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2454                 if (sector_size == -EOVERFLOW)
2455                         goto got_data;
2456                 if (sector_size == -ENODEV)
2457                         return;
2458                 if (sector_size < 0)
2459                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2460                 if (sector_size < 0)
2461                         return;
2462         } else {
2463                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2464                 if (sector_size == -EOVERFLOW)
2465                         goto got_data;
2466                 if (sector_size < 0)
2467                         return;
2468                 if ((sizeof(sdkp->capacity) > 4) &&
2469                     (sdkp->capacity > 0xffffffffULL)) {
2470                         int old_sector_size = sector_size;
2471                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2472                                         "Trying to use READ CAPACITY(16).\n");
2473                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2474                         if (sector_size < 0) {
2475                                 sd_printk(KERN_NOTICE, sdkp,
2476                                         "Using 0xffffffff as device size\n");
2477                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2478                                 sector_size = old_sector_size;
2479                                 goto got_data;
2480                         }
2481                         /* Remember that READ CAPACITY(16) succeeded */
2482                         sdp->try_rc_10_first = 0;
2483                 }
2484         }
2485
2486         /* Some devices are known to return the total number of blocks,
2487          * not the highest block number.  Some devices have versions
2488          * which do this and others which do not.  Some devices we might
2489          * suspect of doing this but we don't know for certain.
2490          *
2491          * If we know the reported capacity is wrong, decrement it.  If
2492          * we can only guess, then assume the number of blocks is even
2493          * (usually true but not always) and err on the side of lowering
2494          * the capacity.
2495          */
2496         if (sdp->fix_capacity ||
2497             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2498                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2499                                 "from its reported value: %llu\n",
2500                                 (unsigned long long) sdkp->capacity);
2501                 --sdkp->capacity;
2502         }
2503
2504 got_data:
2505         if (sector_size == 0) {
2506                 sector_size = 512;
2507                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2508                           "assuming 512.\n");
2509         }
2510
2511         if (sector_size != 512 &&
2512             sector_size != 1024 &&
2513             sector_size != 2048 &&
2514             sector_size != 4096) {
2515                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2516                           sector_size);
2517                 /*
2518                  * The user might want to re-format the drive with
2519                  * a supported sectorsize.  Once this happens, it
2520                  * would be relatively trivial to set the thing up.
2521                  * For this reason, we leave the thing in the table.
2522                  */
2523                 sdkp->capacity = 0;
2524                 /*
2525                  * set a bogus sector size so the normal read/write
2526                  * logic in the block layer will eventually refuse any
2527                  * request on this device without tripping over power
2528                  * of two sector size assumptions
2529                  */
2530                 sector_size = 512;
2531         }
2532         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2533         blk_queue_physical_block_size(sdp->request_queue,
2534                                       sdkp->physical_block_size);
2535         sdkp->device->sector_size = sector_size;
2536
2537         if (sdkp->capacity > 0xffffffff)
2538                 sdp->use_16_for_rw = 1;
2539
2540 }
2541
2542 /*
2543  * Print disk capacity
2544  */
2545 static void
2546 sd_print_capacity(struct scsi_disk *sdkp,
2547                   sector_t old_capacity)
2548 {
2549         int sector_size = sdkp->device->sector_size;
2550         char cap_str_2[10], cap_str_10[10];
2551
2552         string_get_size(sdkp->capacity, sector_size,
2553                         STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2554         string_get_size(sdkp->capacity, sector_size,
2555                         STRING_UNITS_10, cap_str_10,
2556                         sizeof(cap_str_10));
2557
2558         if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2559                 sd_printk(KERN_NOTICE, sdkp,
2560                           "%llu %d-byte logical blocks: (%s/%s)\n",
2561                           (unsigned long long)sdkp->capacity,
2562                           sector_size, cap_str_10, cap_str_2);
2563
2564                 if (sdkp->physical_block_size != sector_size)
2565                         sd_printk(KERN_NOTICE, sdkp,
2566                                   "%u-byte physical blocks\n",
2567                                   sdkp->physical_block_size);
2568
2569                 sd_zbc_print_zones(sdkp);
2570         }
2571 }
2572
2573 /* called with buffer of length 512 */
2574 static inline int
2575 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2576                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2577                  struct scsi_sense_hdr *sshdr)
2578 {
2579         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2580                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2581                                sshdr);
2582 }
2583
2584 /*
2585  * read write protect setting, if possible - called only in sd_revalidate_disk()
2586  * called with buffer of length SD_BUF_SIZE
2587  */
2588 static void
2589 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2590 {
2591         int res;
2592         struct scsi_device *sdp = sdkp->device;
2593         struct scsi_mode_data data;
2594         int disk_ro = get_disk_ro(sdkp->disk);
2595         int old_wp = sdkp->write_prot;
2596
2597         set_disk_ro(sdkp->disk, 0);
2598         if (sdp->skip_ms_page_3f) {
2599                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2600                 return;
2601         }
2602
2603         if (sdp->use_192_bytes_for_3f) {
2604                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2605         } else {
2606                 /*
2607                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2608                  * We have to start carefully: some devices hang if we ask
2609                  * for more than is available.
2610                  */
2611                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2612
2613                 /*
2614                  * Second attempt: ask for page 0 When only page 0 is
2615                  * implemented, a request for page 3F may return Sense Key
2616                  * 5: Illegal Request, Sense Code 24: Invalid field in
2617                  * CDB.
2618                  */
2619                 if (!scsi_status_is_good(res))
2620                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2621
2622                 /*
2623                  * Third attempt: ask 255 bytes, as we did earlier.
2624                  */
2625                 if (!scsi_status_is_good(res))
2626                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2627                                                &data, NULL);
2628         }
2629
2630         if (!scsi_status_is_good(res)) {
2631                 sd_first_printk(KERN_WARNING, sdkp,
2632                           "Test WP failed, assume Write Enabled\n");
2633         } else {
2634                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2635                 set_disk_ro(sdkp->disk, sdkp->write_prot || disk_ro);
2636                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2637                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2638                                   sdkp->write_prot ? "on" : "off");
2639                         sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2640                 }
2641         }
2642 }
2643
2644 /*
2645  * sd_read_cache_type - called only from sd_revalidate_disk()
2646  * called with buffer of length SD_BUF_SIZE
2647  */
2648 static void
2649 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2650 {
2651         int len = 0, res;
2652         struct scsi_device *sdp = sdkp->device;
2653
2654         int dbd;
2655         int modepage;
2656         int first_len;
2657         struct scsi_mode_data data;
2658         struct scsi_sense_hdr sshdr;
2659         int old_wce = sdkp->WCE;
2660         int old_rcd = sdkp->RCD;
2661         int old_dpofua = sdkp->DPOFUA;
2662
2663
2664         if (sdkp->cache_override)
2665                 return;
2666
2667         first_len = 4;
2668         if (sdp->skip_ms_page_8) {
2669                 if (sdp->type == TYPE_RBC)
2670                         goto defaults;
2671                 else {
2672                         if (sdp->skip_ms_page_3f)
2673                                 goto defaults;
2674                         modepage = 0x3F;
2675                         if (sdp->use_192_bytes_for_3f)
2676                                 first_len = 192;
2677                         dbd = 0;
2678                 }
2679         } else if (sdp->type == TYPE_RBC) {
2680                 modepage = 6;
2681                 dbd = 8;
2682         } else {
2683                 modepage = 8;
2684                 dbd = 0;
2685         }
2686
2687         /* cautiously ask */
2688         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2689                         &data, &sshdr);
2690
2691         if (!scsi_status_is_good(res))
2692                 goto bad_sense;
2693
2694         if (!data.header_length) {
2695                 modepage = 6;
2696                 first_len = 0;
2697                 sd_first_printk(KERN_ERR, sdkp,
2698                                 "Missing header in MODE_SENSE response\n");
2699         }
2700
2701         /* that went OK, now ask for the proper length */
2702         len = data.length;
2703
2704         /*
2705          * We're only interested in the first three bytes, actually.
2706          * But the data cache page is defined for the first 20.
2707          */
2708         if (len < 3)
2709                 goto bad_sense;
2710         else if (len > SD_BUF_SIZE) {
2711                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2712                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2713                 len = SD_BUF_SIZE;
2714         }
2715         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2716                 len = 192;
2717
2718         /* Get the data */
2719         if (len > first_len)
2720                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2721                                 &data, &sshdr);
2722
2723         if (scsi_status_is_good(res)) {
2724                 int offset = data.header_length + data.block_descriptor_length;
2725
2726                 while (offset < len) {
2727                         u8 page_code = buffer[offset] & 0x3F;
2728                         u8 spf       = buffer[offset] & 0x40;
2729
2730                         if (page_code == 8 || page_code == 6) {
2731                                 /* We're interested only in the first 3 bytes.
2732                                  */
2733                                 if (len - offset <= 2) {
2734                                         sd_first_printk(KERN_ERR, sdkp,
2735                                                 "Incomplete mode parameter "
2736                                                         "data\n");
2737                                         goto defaults;
2738                                 } else {
2739                                         modepage = page_code;
2740                                         goto Page_found;
2741                                 }
2742                         } else {
2743                                 /* Go to the next page */
2744                                 if (spf && len - offset > 3)
2745                                         offset += 4 + (buffer[offset+2] << 8) +
2746                                                 buffer[offset+3];
2747                                 else if (!spf && len - offset > 1)
2748                                         offset += 2 + buffer[offset+1];
2749                                 else {
2750                                         sd_first_printk(KERN_ERR, sdkp,
2751                                                         "Incomplete mode "
2752                                                         "parameter data\n");
2753                                         goto defaults;
2754                                 }
2755                         }
2756                 }
2757
2758                 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2759                 goto defaults;
2760
2761         Page_found:
2762                 if (modepage == 8) {
2763                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2764                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2765                 } else {
2766                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2767                         sdkp->RCD = 0;
2768                 }
2769
2770                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2771                 if (sdp->broken_fua) {
2772                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2773                         sdkp->DPOFUA = 0;
2774                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2775                            !sdkp->device->use_16_for_rw) {
2776                         sd_first_printk(KERN_NOTICE, sdkp,
2777                                   "Uses READ/WRITE(6), disabling FUA\n");
2778                         sdkp->DPOFUA = 0;
2779                 }
2780
2781                 /* No cache flush allowed for write protected devices */
2782                 if (sdkp->WCE && sdkp->write_prot)
2783                         sdkp->WCE = 0;
2784
2785                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2786                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2787                         sd_printk(KERN_NOTICE, sdkp,
2788                                   "Write cache: %s, read cache: %s, %s\n",
2789                                   sdkp->WCE ? "enabled" : "disabled",
2790                                   sdkp->RCD ? "disabled" : "enabled",
2791                                   sdkp->DPOFUA ? "supports DPO and FUA"
2792                                   : "doesn't support DPO or FUA");
2793
2794                 return;
2795         }
2796
2797 bad_sense:
2798         if (scsi_sense_valid(&sshdr) &&
2799             sshdr.sense_key == ILLEGAL_REQUEST &&
2800             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2801                 /* Invalid field in CDB */
2802                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2803         else
2804                 sd_first_printk(KERN_ERR, sdkp,
2805                                 "Asking for cache data failed\n");
2806
2807 defaults:
2808         if (sdp->wce_default_on) {
2809                 sd_first_printk(KERN_NOTICE, sdkp,
2810                                 "Assuming drive cache: write back\n");
2811                 sdkp->WCE = 1;
2812         } else {
2813                 sd_first_printk(KERN_ERR, sdkp,
2814                                 "Assuming drive cache: write through\n");
2815                 sdkp->WCE = 0;
2816         }
2817         sdkp->RCD = 0;
2818         sdkp->DPOFUA = 0;
2819 }
2820
2821 /*
2822  * The ATO bit indicates whether the DIF application tag is available
2823  * for use by the operating system.
2824  */
2825 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2826 {
2827         int res, offset;
2828         struct scsi_device *sdp = sdkp->device;
2829         struct scsi_mode_data data;
2830         struct scsi_sense_hdr sshdr;
2831
2832         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2833                 return;
2834
2835         if (sdkp->protection_type == 0)
2836                 return;
2837
2838         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2839                               SD_MAX_RETRIES, &data, &sshdr);
2840
2841         if (!scsi_status_is_good(res) || !data.header_length ||
2842             data.length < 6) {
2843                 sd_first_printk(KERN_WARNING, sdkp,
2844                           "getting Control mode page failed, assume no ATO\n");
2845
2846                 if (scsi_sense_valid(&sshdr))
2847                         sd_print_sense_hdr(sdkp, &sshdr);
2848
2849                 return;
2850         }
2851
2852         offset = data.header_length + data.block_descriptor_length;
2853
2854         if ((buffer[offset] & 0x3f) != 0x0a) {
2855                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2856                 return;
2857         }
2858
2859         if ((buffer[offset + 5] & 0x80) == 0)
2860                 return;
2861
2862         sdkp->ATO = 1;
2863
2864         return;
2865 }
2866
2867 /**
2868  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2869  * @sdkp: disk to query
2870  */
2871 static void sd_read_block_limits(struct scsi_disk *sdkp)
2872 {
2873         unsigned int sector_sz = sdkp->device->sector_size;
2874         const int vpd_len = 64;
2875         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2876
2877         if (!buffer ||
2878             /* Block Limits VPD */
2879             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2880                 goto out;
2881
2882         blk_queue_io_min(sdkp->disk->queue,
2883                          get_unaligned_be16(&buffer[6]) * sector_sz);
2884
2885         sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2886         sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2887
2888         if (buffer[3] == 0x3c) {
2889                 unsigned int lba_count, desc_count;
2890
2891                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2892
2893                 if (!sdkp->lbpme)
2894                         goto out;
2895
2896                 lba_count = get_unaligned_be32(&buffer[20]);
2897                 desc_count = get_unaligned_be32(&buffer[24]);
2898
2899                 if (lba_count && desc_count)
2900                         sdkp->max_unmap_blocks = lba_count;
2901
2902                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2903
2904                 if (buffer[32] & 0x80)
2905                         sdkp->unmap_alignment =
2906                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2907
2908                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2909
2910                         if (sdkp->max_unmap_blocks)
2911                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2912                         else
2913                                 sd_config_discard(sdkp, SD_LBP_WS16);
2914
2915                 } else {        /* LBP VPD page tells us what to use */
2916                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2917                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2918                         else if (sdkp->lbpws)
2919                                 sd_config_discard(sdkp, SD_LBP_WS16);
2920                         else if (sdkp->lbpws10)
2921                                 sd_config_discard(sdkp, SD_LBP_WS10);
2922                         else
2923                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2924                 }
2925         }
2926
2927  out:
2928         kfree(buffer);
2929 }
2930
2931 /**
2932  * sd_read_block_characteristics - Query block dev. characteristics
2933  * @sdkp: disk to query
2934  */
2935 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2936 {
2937         struct request_queue *q = sdkp->disk->queue;
2938         unsigned char *buffer;
2939         u16 rot;
2940         const int vpd_len = 64;
2941
2942         buffer = kmalloc(vpd_len, GFP_KERNEL);
2943
2944         if (!buffer ||
2945             /* Block Device Characteristics VPD */
2946             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2947                 goto out;
2948
2949         rot = get_unaligned_be16(&buffer[4]);
2950
2951         if (rot == 1) {
2952                 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2953                 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2954         } else {
2955                 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
2956                 blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
2957         }
2958
2959         if (sdkp->device->type == TYPE_ZBC) {
2960                 /* Host-managed */
2961                 q->limits.zoned = BLK_ZONED_HM;
2962         } else {
2963                 sdkp->zoned = (buffer[8] >> 4) & 3;
2964                 if (sdkp->zoned == 1)
2965                         /* Host-aware */
2966                         q->limits.zoned = BLK_ZONED_HA;
2967                 else
2968                         /*
2969                          * Treat drive-managed devices as
2970                          * regular block devices.
2971                          */
2972                         q->limits.zoned = BLK_ZONED_NONE;
2973         }
2974         if (blk_queue_is_zoned(q) && sdkp->first_scan)
2975                 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2976                       q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2977
2978  out:
2979         kfree(buffer);
2980 }
2981
2982 /**
2983  * sd_read_block_provisioning - Query provisioning VPD page
2984  * @sdkp: disk to query
2985  */
2986 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2987 {
2988         unsigned char *buffer;
2989         const int vpd_len = 8;
2990
2991         if (sdkp->lbpme == 0)
2992                 return;
2993
2994         buffer = kmalloc(vpd_len, GFP_KERNEL);
2995
2996         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2997                 goto out;
2998
2999         sdkp->lbpvpd    = 1;
3000         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
3001         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
3002         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
3003
3004  out:
3005         kfree(buffer);
3006 }
3007
3008 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
3009 {
3010         struct scsi_device *sdev = sdkp->device;
3011
3012         if (sdev->host->no_write_same) {
3013                 sdev->no_write_same = 1;
3014
3015                 return;
3016         }
3017
3018         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
3019                 /* too large values might cause issues with arcmsr */
3020                 int vpd_buf_len = 64;
3021
3022                 sdev->no_report_opcodes = 1;
3023
3024                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3025                  * CODES is unsupported and the device has an ATA
3026                  * Information VPD page (SAT).
3027                  */
3028                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3029                         sdev->no_write_same = 1;
3030         }
3031
3032         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3033                 sdkp->ws16 = 1;
3034
3035         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3036                 sdkp->ws10 = 1;
3037 }
3038
3039 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3040 {
3041         struct scsi_device *sdev = sdkp->device;
3042
3043         if (!sdev->security_supported)
3044                 return;
3045
3046         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3047                         SECURITY_PROTOCOL_IN) == 1 &&
3048             scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3049                         SECURITY_PROTOCOL_OUT) == 1)
3050                 sdkp->security = 1;
3051 }
3052
3053 /**
3054  *      sd_revalidate_disk - called the first time a new disk is seen,
3055  *      performs disk spin up, read_capacity, etc.
3056  *      @disk: struct gendisk we care about
3057  **/
3058 static int sd_revalidate_disk(struct gendisk *disk)
3059 {
3060         struct scsi_disk *sdkp = scsi_disk(disk);
3061         struct scsi_device *sdp = sdkp->device;
3062         struct request_queue *q = sdkp->disk->queue;
3063         sector_t old_capacity = sdkp->capacity;
3064         unsigned char *buffer;
3065         unsigned int dev_max, rw_max;
3066
3067         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3068                                       "sd_revalidate_disk\n"));
3069
3070         /*
3071          * If the device is offline, don't try and read capacity or any
3072          * of the other niceties.
3073          */
3074         if (!scsi_device_online(sdp))
3075                 goto out;
3076
3077         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3078         if (!buffer) {
3079                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3080                           "allocation failure.\n");
3081                 goto out;
3082         }
3083
3084         sd_spinup_disk(sdkp);
3085
3086         /*
3087          * Without media there is no reason to ask; moreover, some devices
3088          * react badly if we do.
3089          */
3090         if (sdkp->media_present) {
3091                 sd_read_capacity(sdkp, buffer);
3092
3093                 if (scsi_device_supports_vpd(sdp)) {
3094                         sd_read_block_provisioning(sdkp);
3095                         sd_read_block_limits(sdkp);
3096                         sd_read_block_characteristics(sdkp);
3097                         sd_zbc_read_zones(sdkp, buffer);
3098                 }
3099
3100                 sd_print_capacity(sdkp, old_capacity);
3101
3102                 sd_read_write_protect_flag(sdkp, buffer);
3103                 sd_read_cache_type(sdkp, buffer);
3104                 sd_read_app_tag_own(sdkp, buffer);
3105                 sd_read_write_same(sdkp, buffer);
3106                 sd_read_security(sdkp, buffer);
3107         }
3108
3109         /*
3110          * We now have all cache related info, determine how we deal
3111          * with flush requests.
3112          */
3113         sd_set_flush_flag(sdkp);
3114
3115         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3116         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3117
3118         /* Some devices report a maximum block count for READ/WRITE requests. */
3119         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3120         q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3121
3122         /*
3123          * Determine the device's preferred I/O size for reads and writes
3124          * unless the reported value is unreasonably small, large, or
3125          * garbage.
3126          */
3127         if (sdkp->opt_xfer_blocks &&
3128             sdkp->opt_xfer_blocks <= dev_max &&
3129             sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
3130             logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
3131                 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3132                 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3133         } else
3134                 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3135                                       (sector_t)BLK_DEF_MAX_SECTORS);
3136
3137         /* Do not exceed controller limit */
3138         rw_max = min(rw_max, queue_max_hw_sectors(q));
3139
3140         /*
3141          * Only update max_sectors if previously unset or if the current value
3142          * exceeds the capabilities of the hardware.
3143          */
3144         if (sdkp->first_scan ||
3145             q->limits.max_sectors > q->limits.max_dev_sectors ||
3146             q->limits.max_sectors > q->limits.max_hw_sectors)
3147                 q->limits.max_sectors = rw_max;
3148
3149         sdkp->first_scan = 0;
3150
3151         set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3152         sd_config_write_same(sdkp);
3153         kfree(buffer);
3154
3155  out:
3156         return 0;
3157 }
3158
3159 /**
3160  *      sd_unlock_native_capacity - unlock native capacity
3161  *      @disk: struct gendisk to set capacity for
3162  *
3163  *      Block layer calls this function if it detects that partitions
3164  *      on @disk reach beyond the end of the device.  If the SCSI host
3165  *      implements ->unlock_native_capacity() method, it's invoked to
3166  *      give it a chance to adjust the device capacity.
3167  *
3168  *      CONTEXT:
3169  *      Defined by block layer.  Might sleep.
3170  */
3171 static void sd_unlock_native_capacity(struct gendisk *disk)
3172 {
3173         struct scsi_device *sdev = scsi_disk(disk)->device;
3174
3175         if (sdev->host->hostt->unlock_native_capacity)
3176                 sdev->host->hostt->unlock_native_capacity(sdev);
3177 }
3178
3179 /**
3180  *      sd_format_disk_name - format disk name
3181  *      @prefix: name prefix - ie. "sd" for SCSI disks
3182  *      @index: index of the disk to format name for
3183  *      @buf: output buffer
3184  *      @buflen: length of the output buffer
3185  *
3186  *      SCSI disk names starts at sda.  The 26th device is sdz and the
3187  *      27th is sdaa.  The last one for two lettered suffix is sdzz
3188  *      which is followed by sdaaa.
3189  *
3190  *      This is basically 26 base counting with one extra 'nil' entry
3191  *      at the beginning from the second digit on and can be
3192  *      determined using similar method as 26 base conversion with the
3193  *      index shifted -1 after each digit is computed.
3194  *
3195  *      CONTEXT:
3196  *      Don't care.
3197  *
3198  *      RETURNS:
3199  *      0 on success, -errno on failure.
3200  */
3201 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3202 {
3203         const int base = 'z' - 'a' + 1;
3204         char *begin = buf + strlen(prefix);
3205         char *end = buf + buflen;
3206         char *p;
3207         int unit;
3208
3209         p = end - 1;
3210         *p = '\0';
3211         unit = base;
3212         do {
3213                 if (p == begin)
3214                         return -EINVAL;
3215                 *--p = 'a' + (index % unit);
3216                 index = (index / unit) - 1;
3217         } while (index >= 0);
3218
3219         memmove(begin, p, end - p);
3220         memcpy(buf, prefix, strlen(prefix));
3221
3222         return 0;
3223 }
3224
3225 /*
3226  * The asynchronous part of sd_probe
3227  */
3228 static void sd_probe_async(void *data, async_cookie_t cookie)
3229 {
3230         struct scsi_disk *sdkp = data;
3231         struct scsi_device *sdp;
3232         struct gendisk *gd;
3233         u32 index;
3234         struct device *dev;
3235
3236         sdp = sdkp->device;
3237         gd = sdkp->disk;
3238         index = sdkp->index;
3239         dev = &sdp->sdev_gendev;
3240
3241         gd->major = sd_major((index & 0xf0) >> 4);
3242         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3243
3244         gd->fops = &sd_fops;
3245         gd->private_data = &sdkp->driver;
3246         gd->queue = sdkp->device->request_queue;
3247
3248         /* defaults, until the device tells us otherwise */
3249         sdp->sector_size = 512;
3250         sdkp->capacity = 0;
3251         sdkp->media_present = 1;
3252         sdkp->write_prot = 0;
3253         sdkp->cache_override = 0;
3254         sdkp->WCE = 0;
3255         sdkp->RCD = 0;
3256         sdkp->ATO = 0;
3257         sdkp->first_scan = 1;
3258         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3259
3260         sd_revalidate_disk(gd);
3261
3262         gd->flags = GENHD_FL_EXT_DEVT;
3263         if (sdp->removable) {
3264                 gd->flags |= GENHD_FL_REMOVABLE;
3265                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3266         }
3267
3268         blk_pm_runtime_init(sdp->request_queue, dev);
3269         device_add_disk(dev, gd, NULL);
3270         if (sdkp->capacity)
3271                 sd_dif_config_host(sdkp);
3272
3273         sd_revalidate_disk(gd);
3274
3275         if (sdkp->security) {
3276                 sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit);
3277                 if (sdkp->opal_dev)
3278                         sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
3279         }
3280
3281         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3282                   sdp->removable ? "removable " : "");
3283         scsi_autopm_put_device(sdp);
3284         put_device(&sdkp->dev);
3285 }
3286
3287 /**
3288  *      sd_probe - called during driver initialization and whenever a
3289  *      new scsi device is attached to the system. It is called once
3290  *      for each scsi device (not just disks) present.
3291  *      @dev: pointer to device object
3292  *
3293  *      Returns 0 if successful (or not interested in this scsi device
3294  *      (e.g. scanner)); 1 when there is an error.
3295  *
3296  *      Note: this function is invoked from the scsi mid-level.
3297  *      This function sets up the mapping between a given
3298  *      <host,channel,id,lun> (found in sdp) and new device name
3299  *      (e.g. /dev/sda). More precisely it is the block device major
3300  *      and minor number that is chosen here.
3301  *
3302  *      Assume sd_probe is not re-entrant (for time being)
3303  *      Also think about sd_probe() and sd_remove() running coincidentally.
3304  **/
3305 static int sd_probe(struct device *dev)
3306 {
3307         struct scsi_device *sdp = to_scsi_device(dev);
3308         struct scsi_disk *sdkp;
3309         struct gendisk *gd;
3310         int index;
3311         int error;
3312
3313         scsi_autopm_get_device(sdp);
3314         error = -ENODEV;
3315         if (sdp->type != TYPE_DISK &&
3316             sdp->type != TYPE_ZBC &&
3317             sdp->type != TYPE_MOD &&
3318             sdp->type != TYPE_RBC)
3319                 goto out;
3320
3321 #ifndef CONFIG_BLK_DEV_ZONED
3322         if (sdp->type == TYPE_ZBC)
3323                 goto out;
3324 #endif
3325         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3326                                         "sd_probe\n"));
3327
3328         error = -ENOMEM;
3329         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3330         if (!sdkp)
3331                 goto out;
3332
3333         gd = alloc_disk(SD_MINORS);
3334         if (!gd)
3335                 goto out_free;
3336
3337         index = ida_alloc(&sd_index_ida, GFP_KERNEL);
3338         if (index < 0) {
3339                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3340                 goto out_put;
3341         }
3342
3343         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3344         if (error) {
3345                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3346                 goto out_free_index;
3347         }
3348
3349         sdkp->device = sdp;
3350         sdkp->driver = &sd_template;
3351         sdkp->disk = gd;
3352         sdkp->index = index;
3353         atomic_set(&sdkp->openers, 0);
3354         atomic_set(&sdkp->device->ioerr_cnt, 0);
3355
3356         if (!sdp->request_queue->rq_timeout) {
3357                 if (sdp->type != TYPE_MOD)
3358                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3359                 else
3360                         blk_queue_rq_timeout(sdp->request_queue,
3361                                              SD_MOD_TIMEOUT);
3362         }
3363
3364         device_initialize(&sdkp->dev);
3365         sdkp->dev.parent = dev;
3366         sdkp->dev.class = &sd_disk_class;
3367         dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3368
3369         error = device_add(&sdkp->dev);
3370         if (error)
3371                 goto out_free_index;
3372
3373         get_device(dev);
3374         dev_set_drvdata(dev, sdkp);
3375
3376         get_device(&sdkp->dev); /* prevent release before async_schedule */
3377         async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3378
3379         return 0;
3380
3381  out_free_index:
3382         ida_free(&sd_index_ida, index);
3383  out_put:
3384         put_disk(gd);
3385  out_free:
3386         kfree(sdkp);
3387  out:
3388         scsi_autopm_put_device(sdp);
3389         return error;
3390 }
3391
3392 /**
3393  *      sd_remove - called whenever a scsi disk (previously recognized by
3394  *      sd_probe) is detached from the system. It is called (potentially
3395  *      multiple times) during sd module unload.
3396  *      @dev: pointer to device object
3397  *
3398  *      Note: this function is invoked from the scsi mid-level.
3399  *      This function potentially frees up a device name (e.g. /dev/sdc)
3400  *      that could be re-used by a subsequent sd_probe().
3401  *      This function is not called when the built-in sd driver is "exit-ed".
3402  **/
3403 static int sd_remove(struct device *dev)
3404 {
3405         struct scsi_disk *sdkp;
3406         dev_t devt;
3407
3408         sdkp = dev_get_drvdata(dev);
3409         devt = disk_devt(sdkp->disk);
3410         scsi_autopm_get_device(sdkp->device);
3411
3412         async_synchronize_full_domain(&scsi_sd_pm_domain);
3413         async_synchronize_full_domain(&scsi_sd_probe_domain);
3414         device_del(&sdkp->dev);
3415         del_gendisk(sdkp->disk);
3416         sd_shutdown(dev);
3417
3418         free_opal_dev(sdkp->opal_dev);
3419
3420         blk_register_region(devt, SD_MINORS, NULL,
3421                             sd_default_probe, NULL, NULL);
3422
3423         mutex_lock(&sd_ref_mutex);
3424         dev_set_drvdata(dev, NULL);
3425         put_device(&sdkp->dev);
3426         mutex_unlock(&sd_ref_mutex);
3427
3428         return 0;
3429 }
3430
3431 /**
3432  *      scsi_disk_release - Called to free the scsi_disk structure
3433  *      @dev: pointer to embedded class device
3434  *
3435  *      sd_ref_mutex must be held entering this routine.  Because it is
3436  *      called on last put, you should always use the scsi_disk_get()
3437  *      scsi_disk_put() helpers which manipulate the semaphore directly
3438  *      and never do a direct put_device.
3439  **/
3440 static void scsi_disk_release(struct device *dev)
3441 {
3442         struct scsi_disk *sdkp = to_scsi_disk(dev);
3443         struct gendisk *disk = sdkp->disk;
3444
3445         ida_free(&sd_index_ida, sdkp->index);
3446
3447         disk->private_data = NULL;
3448         put_disk(disk);
3449         put_device(&sdkp->device->sdev_gendev);
3450
3451         kfree(sdkp);
3452 }
3453
3454 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3455 {
3456         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3457         struct scsi_sense_hdr sshdr;
3458         struct scsi_device *sdp = sdkp->device;
3459         int res;
3460
3461         if (start)
3462                 cmd[4] |= 1;    /* START */
3463
3464         if (sdp->start_stop_pwr_cond)
3465                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3466
3467         if (!scsi_device_online(sdp))
3468                 return -ENODEV;
3469
3470         res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3471                         SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
3472         if (res) {
3473                 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3474                 if (driver_byte(res) == DRIVER_SENSE)
3475                         sd_print_sense_hdr(sdkp, &sshdr);
3476                 if (scsi_sense_valid(&sshdr) &&
3477                         /* 0x3a is medium not present */
3478                         sshdr.asc == 0x3a)
3479                         res = 0;
3480         }
3481
3482         /* SCSI error codes must not go to the generic layer */
3483         if (res)
3484                 return -EIO;
3485
3486         return 0;
3487 }
3488
3489 /*
3490  * Send a SYNCHRONIZE CACHE instruction down to the device through
3491  * the normal SCSI command structure.  Wait for the command to
3492  * complete.
3493  */
3494 static void sd_shutdown(struct device *dev)
3495 {
3496         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3497
3498         if (!sdkp)
3499                 return;         /* this can happen */
3500
3501         if (pm_runtime_suspended(dev))
3502                 return;
3503
3504         if (sdkp->WCE && sdkp->media_present) {
3505                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3506                 sd_sync_cache(sdkp, NULL);
3507         }
3508
3509         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3510                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3511                 sd_start_stop_device(sdkp, 0);
3512         }
3513 }
3514
3515 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3516 {
3517         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3518         struct scsi_sense_hdr sshdr;
3519         int ret = 0;
3520
3521         if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
3522                 return 0;
3523
3524         if (sdkp->WCE && sdkp->media_present) {
3525                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3526                 ret = sd_sync_cache(sdkp, &sshdr);
3527
3528                 if (ret) {
3529                         /* ignore OFFLINE device */
3530                         if (ret == -ENODEV)
3531                                 return 0;
3532
3533                         if (!scsi_sense_valid(&sshdr) ||
3534                             sshdr.sense_key != ILLEGAL_REQUEST)
3535                                 return ret;
3536
3537                         /*
3538                          * sshdr.sense_key == ILLEGAL_REQUEST means this drive
3539                          * doesn't support sync. There's not much to do and
3540                          * suspend shouldn't fail.
3541                          */
3542                         ret = 0;
3543                 }
3544         }
3545
3546         if (sdkp->device->manage_start_stop) {
3547                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3548                 /* an error is not worth aborting a system sleep */
3549                 ret = sd_start_stop_device(sdkp, 0);
3550                 if (ignore_stop_errors)
3551                         ret = 0;
3552         }
3553
3554         return ret;
3555 }
3556
3557 static int sd_suspend_system(struct device *dev)
3558 {
3559         return sd_suspend_common(dev, true);
3560 }
3561
3562 static int sd_suspend_runtime(struct device *dev)
3563 {
3564         return sd_suspend_common(dev, false);
3565 }
3566
3567 static int sd_resume(struct device *dev)
3568 {
3569         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3570         int ret;
3571
3572         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
3573                 return 0;
3574
3575         if (!sdkp->device->manage_start_stop)
3576                 return 0;
3577
3578         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3579         ret = sd_start_stop_device(sdkp, 1);
3580         if (!ret)
3581                 opal_unlock_from_suspend(sdkp->opal_dev);
3582         return ret;
3583 }
3584
3585 /**
3586  *      init_sd - entry point for this driver (both when built in or when
3587  *      a module).
3588  *
3589  *      Note: this function registers this driver with the scsi mid-level.
3590  **/
3591 static int __init init_sd(void)
3592 {
3593         int majors = 0, i, err;
3594
3595         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3596
3597         for (i = 0; i < SD_MAJORS; i++) {
3598                 if (register_blkdev(sd_major(i), "sd") != 0)
3599                         continue;
3600                 majors++;
3601                 blk_register_region(sd_major(i), SD_MINORS, NULL,
3602                                     sd_default_probe, NULL, NULL);
3603         }
3604
3605         if (!majors)
3606                 return -ENODEV;
3607
3608         err = class_register(&sd_disk_class);
3609         if (err)
3610                 goto err_out;
3611
3612         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3613                                          0, 0, NULL);
3614         if (!sd_cdb_cache) {
3615                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3616                 err = -ENOMEM;
3617                 goto err_out_class;
3618         }
3619
3620         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3621         if (!sd_cdb_pool) {
3622                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3623                 err = -ENOMEM;
3624                 goto err_out_cache;
3625         }
3626
3627         sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
3628         if (!sd_page_pool) {
3629                 printk(KERN_ERR "sd: can't init discard page pool\n");
3630                 err = -ENOMEM;
3631                 goto err_out_ppool;
3632         }
3633
3634         err = scsi_register_driver(&sd_template.gendrv);
3635         if (err)
3636                 goto err_out_driver;
3637
3638         return 0;
3639
3640 err_out_driver:
3641         mempool_destroy(sd_page_pool);
3642
3643 err_out_ppool:
3644         mempool_destroy(sd_cdb_pool);
3645
3646 err_out_cache:
3647         kmem_cache_destroy(sd_cdb_cache);
3648
3649 err_out_class:
3650         class_unregister(&sd_disk_class);
3651 err_out:
3652         for (i = 0; i < SD_MAJORS; i++)
3653                 unregister_blkdev(sd_major(i), "sd");
3654         return err;
3655 }
3656
3657 /**
3658  *      exit_sd - exit point for this driver (when it is a module).
3659  *
3660  *      Note: this function unregisters this driver from the scsi mid-level.
3661  **/
3662 static void __exit exit_sd(void)
3663 {
3664         int i;
3665
3666         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3667
3668         scsi_unregister_driver(&sd_template.gendrv);
3669         mempool_destroy(sd_cdb_pool);
3670         mempool_destroy(sd_page_pool);
3671         kmem_cache_destroy(sd_cdb_cache);
3672
3673         class_unregister(&sd_disk_class);
3674
3675         for (i = 0; i < SD_MAJORS; i++) {
3676                 blk_unregister_region(sd_major(i), SD_MINORS);
3677                 unregister_blkdev(sd_major(i), "sd");
3678         }
3679 }
3680
3681 module_init(init_sd);
3682 module_exit(exit_sd);
3683
3684 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3685                                struct scsi_sense_hdr *sshdr)
3686 {
3687         scsi_print_sense_hdr(sdkp->device,
3688                              sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3689 }
3690
3691 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3692                             int result)
3693 {
3694         const char *hb_string = scsi_hostbyte_string(result);
3695         const char *db_string = scsi_driverbyte_string(result);
3696
3697         if (hb_string || db_string)
3698                 sd_printk(KERN_INFO, sdkp,
3699                           "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3700                           hb_string ? hb_string : "invalid",
3701                           db_string ? db_string : "invalid");
3702         else
3703                 sd_printk(KERN_INFO, sdkp,
3704                           "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3705                           msg, host_byte(result), driver_byte(result));
3706 }
3707