drivers/scsi/sd.c

   1 /*
   2  *      sd.c Copyright (C) 1992 Drew Eckhardt
   3  *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   4  *
   5  *      Linux scsi disk driver
   6  *              Initial versions: Drew Eckhardt
   7  *              Subsequent revisions: Eric Youngdale
   8  *      Modification history:
   9  *       - Drew Eckhardt <drew@colorado.edu> original
  10  *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
  11  *         outstanding request, and other enhancements.
  12  *         Support loadable low-level scsi drivers.
  13  *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
  14  *         eight major numbers.
  15  *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
  16  *       - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
  17  *         sd_init and cleanups.
  18  *       - Alex Davis <letmein@erols.com> Fix problem where partition info
  19  *         not being read in sd_open. Fix problem where removable media
  20  *         could be ejected after sd_open.
  21  *       - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
  22  *       - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
  23  *         <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
  24  *         Support 32k/1M disks.
  25  *
  26  *      Logging policy (needs CONFIG_SCSI_LOGGING defined):
  27  *       - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  28  *       - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  29  *       - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  30  *       - entering other commands: SCSI_LOG_HLQUEUE level 3
  31  *      Note: when the logging level is set by the user, it must be greater
  32  *      than the level indicated above to trigger output.
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/fs.h>
  37 #include <linux/kernel.h>
  38 #include <linux/mm.h>
  39 #include <linux/bio.h>
  40 #include <linux/genhd.h>
  41 #include <linux/hdreg.h>
  42 #include <linux/errno.h>
  43 #include <linux/idr.h>
  44 #include <linux/interrupt.h>
  45 #include <linux/init.h>
  46 #include <linux/blkdev.h>
  47 #include <linux/blkpg.h>
  48 #include <linux/delay.h>
  49 #include <linux/mutex.h>
  50 #include <linux/string_helpers.h>
  51 #include <linux/async.h>
  52 #include <linux/slab.h>
  53 #include <linux/sed-opal.h>
  54 #include <linux/pm_runtime.h>
  55 #include <linux/pr.h>
  56 #include <linux/t10-pi.h>
  57 #include <linux/uaccess.h>
  58 #include <asm/unaligned.h>
  59
  60 #include <scsi/scsi.h>
  61 #include <scsi/scsi_cmnd.h>
  62 #include <scsi/scsi_dbg.h>
  63 #include <scsi/scsi_device.h>
  64 #include <scsi/scsi_driver.h>
  65 #include <scsi/scsi_eh.h>
  66 #include <scsi/scsi_host.h>
  67 #include <scsi/scsi_ioctl.h>
  68 #include <scsi/scsicam.h>
  69
  70 #include "sd.h"
  71 #include "scsi_priv.h"
  72 #include "scsi_logging.h"
  73
  74 MODULE_AUTHOR("Eric Youngdale");
  75 MODULE_DESCRIPTION("SCSI disk (sd) driver");
  76 MODULE_LICENSE("GPL");
  77
  78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  94 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  95 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  96 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  97 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
  98
  99 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
 100 #define SD_MINORS       16
 101 #else
 102 #define SD_MINORS       0
 103 #endif
 104
 105 static void sd_config_discard(struct scsi_disk *, unsigned int);
 106 static void sd_config_write_same(struct scsi_disk *);
 107 static int  sd_revalidate_disk(struct gendisk *);
 108 static void sd_unlock_native_capacity(struct gendisk *disk);
 109 static int  sd_probe(struct device *);
 110 static int  sd_remove(struct device *);
 111 static void sd_shutdown(struct device *);
 112 static int sd_suspend_system(struct device *);
 113 static int sd_suspend_runtime(struct device *);
 114 static int sd_resume(struct device *);
 115 static void sd_rescan(struct device *);
 116 static int sd_init_command(struct scsi_cmnd *SCpnt);
 117 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 118 static int sd_done(struct scsi_cmnd *);
 119 static void sd_eh_reset(struct scsi_cmnd *);
 120 static int sd_eh_action(struct scsi_cmnd *, int);
 121 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 122 static void scsi_disk_release(struct device *cdev);
 123 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 124 static void sd_print_result(const struct scsi_disk *, const char *, int);
 125
 126 static DEFINE_SPINLOCK(sd_index_lock);
 127 static DEFINE_IDA(sd_index_ida);
 128
 129 /* This semaphore is used to mediate the 0->1 reference get in the
 130  * face of object destruction (i.e. we can't allow a get on an
 131  * object after last put) */
 132 static DEFINE_MUTEX(sd_ref_mutex);
 133
 134 static struct kmem_cache *sd_cdb_cache;
 135 static mempool_t *sd_cdb_pool;
 136
 137 static const char *sd_cache_types[] = {
 138         "write through", "none", "write back",
 139         "write back, no read (daft)"
 140 };
 141
 142 static void sd_set_flush_flag(struct scsi_disk *sdkp)
 143 {
 144         bool wc = false, fua = false;
 145
 146         if (sdkp->WCE) {
 147                 wc = true;
 148                 if (sdkp->DPOFUA)
 149                         fua = true;
 150         }
 151
 152         blk_queue_write_cache(sdkp->disk->queue, wc, fua);
 153 }
 154
 155 static ssize_t
 156 cache_type_store(struct device *dev, struct device_attribute *attr,
 157                  const char *buf, size_t count)
 158 {
 159         int ct, rcd, wce, sp;
 160         struct scsi_disk *sdkp = to_scsi_disk(dev);
 161         struct scsi_device *sdp = sdkp->device;
 162         char buffer[64];
 163         char *buffer_data;
 164         struct scsi_mode_data data;
 165         struct scsi_sense_hdr sshdr;
 166         static const char temp[] = "temporary ";
 167         int len;
 168
 169         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 170                 /* no cache control on RBC devices; theoretically they
 171                  * can do it, but there's probably so many exceptions
 172                  * it's not worth the risk */
 173                 return -EINVAL;
 174
 175         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 176                 buf += sizeof(temp) - 1;
 177                 sdkp->cache_override = 1;
 178         } else {
 179                 sdkp->cache_override = 0;
 180         }
 181
 182         ct = sysfs_match_string(sd_cache_types, buf);
 183         if (ct < 0)
 184                 return -EINVAL;
 185
 186         rcd = ct & 0x01 ? 1 : 0;
 187         wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 188
 189         if (sdkp->cache_override) {
 190                 sdkp->WCE = wce;
 191                 sdkp->RCD = rcd;
 192                 sd_set_flush_flag(sdkp);
 193                 return count;
 194         }
 195
 196         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 197                             SD_MAX_RETRIES, &data, NULL))
 198                 return -EINVAL;
 199         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 200                   data.block_descriptor_length);
 201         buffer_data = buffer + data.header_length +
 202                 data.block_descriptor_length;
 203         buffer_data[2] &= ~0x05;
 204         buffer_data[2] |= wce << 2 | rcd;
 205         sp = buffer_data[0] & 0x80 ? 1 : 0;
 206         buffer_data[0] &= ~0x80;
 207
 208         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 209                              SD_MAX_RETRIES, &data, &sshdr)) {
 210                 if (scsi_sense_valid(&sshdr))
 211                         sd_print_sense_hdr(sdkp, &sshdr);
 212                 return -EINVAL;
 213         }
 214         revalidate_disk(sdkp->disk);
 215         return count;
 216 }
 217
 218 static ssize_t
 219 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
 220                        char *buf)
 221 {
 222         struct scsi_disk *sdkp = to_scsi_disk(dev);
 223         struct scsi_device *sdp = sdkp->device;
 224
 225         return sprintf(buf, "%u\n", sdp->manage_start_stop);
 226 }
 227
 228 static ssize_t
 229 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
 230                         const char *buf, size_t count)
 231 {
 232         struct scsi_disk *sdkp = to_scsi_disk(dev);
 233         struct scsi_device *sdp = sdkp->device;
 234
 235         if (!capable(CAP_SYS_ADMIN))
 236                 return -EACCES;
 237
 238         sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
 239
 240         return count;
 241 }
 242 static DEVICE_ATTR_RW(manage_start_stop);
 243
 244 static ssize_t
 245 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 246 {
 247         struct scsi_disk *sdkp = to_scsi_disk(dev);
 248
 249         return sprintf(buf, "%u\n", sdkp->device->allow_restart);
 250 }
 251
 252 static ssize_t
 253 allow_restart_store(struct device *dev, struct device_attribute *attr,
 254                     const char *buf, size_t count)
 255 {
 256         struct scsi_disk *sdkp = to_scsi_disk(dev);
 257         struct scsi_device *sdp = sdkp->device;
 258
 259         if (!capable(CAP_SYS_ADMIN))
 260                 return -EACCES;
 261
 262         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 263                 return -EINVAL;
 264
 265         sdp->allow_restart = simple_strtoul(buf, NULL, 10);
 266
 267         return count;
 268 }
 269 static DEVICE_ATTR_RW(allow_restart);
 270
 271 static ssize_t
 272 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 273 {
 274         struct scsi_disk *sdkp = to_scsi_disk(dev);
 275         int ct = sdkp->RCD + 2*sdkp->WCE;
 276
 277         return sprintf(buf, "%s\n", sd_cache_types[ct]);
 278 }
 279 static DEVICE_ATTR_RW(cache_type);
 280
 281 static ssize_t
 282 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 283 {
 284         struct scsi_disk *sdkp = to_scsi_disk(dev);
 285
 286         return sprintf(buf, "%u\n", sdkp->DPOFUA);
 287 }
 288 static DEVICE_ATTR_RO(FUA);
 289
 290 static ssize_t
 291 protection_type_show(struct device *dev, struct device_attribute *attr,
 292                      char *buf)
 293 {
 294         struct scsi_disk *sdkp = to_scsi_disk(dev);
 295
 296         return sprintf(buf, "%u\n", sdkp->protection_type);
 297 }
 298
 299 static ssize_t
 300 protection_type_store(struct device *dev, struct device_attribute *attr,
 301                       const char *buf, size_t count)
 302 {
 303         struct scsi_disk *sdkp = to_scsi_disk(dev);
 304         unsigned int val;
 305         int err;
 306
 307         if (!capable(CAP_SYS_ADMIN))
 308                 return -EACCES;
 309
 310         err = kstrtouint(buf, 10, &val);
 311
 312         if (err)
 313                 return err;
 314
 315         if (val >= 0 && val <= T10_PI_TYPE3_PROTECTION)
 316                 sdkp->protection_type = val;
 317
 318         return count;
 319 }
 320 static DEVICE_ATTR_RW(protection_type);
 321
 322 static ssize_t
 323 protection_mode_show(struct device *dev, struct device_attribute *attr,
 324                      char *buf)
 325 {
 326         struct scsi_disk *sdkp = to_scsi_disk(dev);
 327         struct scsi_device *sdp = sdkp->device;
 328         unsigned int dif, dix;
 329
 330         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 331         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 332
 333         if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
 334                 dif = 0;
 335                 dix = 1;
 336         }
 337
 338         if (!dif && !dix)
 339                 return sprintf(buf, "none\n");
 340
 341         return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
 342 }
 343 static DEVICE_ATTR_RO(protection_mode);
 344
 345 static ssize_t
 346 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 347 {
 348         struct scsi_disk *sdkp = to_scsi_disk(dev);
 349
 350         return sprintf(buf, "%u\n", sdkp->ATO);
 351 }
 352 static DEVICE_ATTR_RO(app_tag_own);
 353
 354 static ssize_t
 355 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
 356                        char *buf)
 357 {
 358         struct scsi_disk *sdkp = to_scsi_disk(dev);
 359
 360         return sprintf(buf, "%u\n", sdkp->lbpme);
 361 }
 362 static DEVICE_ATTR_RO(thin_provisioning);
 363
 364 /* sysfs_match_string() requires dense arrays */
 365 static const char *lbp_mode[] = {
 366         [SD_LBP_FULL]           = "full",
 367         [SD_LBP_UNMAP]          = "unmap",
 368         [SD_LBP_WS16]           = "writesame_16",
 369         [SD_LBP_WS10]           = "writesame_10",
 370         [SD_LBP_ZERO]           = "writesame_zero",
 371         [SD_LBP_DISABLE]        = "disabled",
 372 };
 373
 374 static ssize_t
 375 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
 376                        char *buf)
 377 {
 378         struct scsi_disk *sdkp = to_scsi_disk(dev);
 379
 380         return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 381 }
 382
 383 static ssize_t
 384 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
 385                         const char *buf, size_t count)
 386 {
 387         struct scsi_disk *sdkp = to_scsi_disk(dev);
 388         struct scsi_device *sdp = sdkp->device;
 389         int mode;
 390
 391         if (!capable(CAP_SYS_ADMIN))
 392                 return -EACCES;
 393
 394         if (sd_is_zoned(sdkp)) {
 395                 sd_config_discard(sdkp, SD_LBP_DISABLE);
 396                 return count;
 397         }
 398
 399         if (sdp->type != TYPE_DISK)
 400                 return -EINVAL;
 401
 402         mode = sysfs_match_string(lbp_mode, buf);
 403         if (mode < 0)
 404                 return -EINVAL;
 405
 406         sd_config_discard(sdkp, mode);
 407
 408         return count;
 409 }
 410 static DEVICE_ATTR_RW(provisioning_mode);
 411
 412 /* sysfs_match_string() requires dense arrays */
 413 static const char *zeroing_mode[] = {
 414         [SD_ZERO_WRITE]         = "write",
 415         [SD_ZERO_WS]            = "writesame",
 416         [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
 417         [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
 418 };
 419
 420 static ssize_t
 421 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
 422                   char *buf)
 423 {
 424         struct scsi_disk *sdkp = to_scsi_disk(dev);
 425
 426         return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
 427 }
 428
 429 static ssize_t
 430 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
 431                    const char *buf, size_t count)
 432 {
 433         struct scsi_disk *sdkp = to_scsi_disk(dev);
 434         int mode;
 435
 436         if (!capable(CAP_SYS_ADMIN))
 437                 return -EACCES;
 438
 439         mode = sysfs_match_string(zeroing_mode, buf);
 440         if (mode < 0)
 441                 return -EINVAL;
 442
 443         sdkp->zeroing_mode = mode;
 444
 445         return count;
 446 }
 447 static DEVICE_ATTR_RW(zeroing_mode);
 448
 449 static ssize_t
 450 max_medium_access_timeouts_show(struct device *dev,
 451                                 struct device_attribute *attr, char *buf)
 452 {
 453         struct scsi_disk *sdkp = to_scsi_disk(dev);
 454
 455         return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
 456 }
 457
 458 static ssize_t
 459 max_medium_access_timeouts_store(struct device *dev,
 460                                  struct device_attribute *attr, const char *buf,
 461                                  size_t count)
 462 {
 463         struct scsi_disk *sdkp = to_scsi_disk(dev);
 464         int err;
 465
 466         if (!capable(CAP_SYS_ADMIN))
 467                 return -EACCES;
 468
 469         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 470
 471         return err ? err : count;
 472 }
 473 static DEVICE_ATTR_RW(max_medium_access_timeouts);
 474
 475 static ssize_t
 476 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
 477                            char *buf)
 478 {
 479         struct scsi_disk *sdkp = to_scsi_disk(dev);
 480
 481         return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
 482 }
 483
 484 static ssize_t
 485 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
 486                             const char *buf, size_t count)
 487 {
 488         struct scsi_disk *sdkp = to_scsi_disk(dev);
 489         struct scsi_device *sdp = sdkp->device;
 490         unsigned long max;
 491         int err;
 492
 493         if (!capable(CAP_SYS_ADMIN))
 494                 return -EACCES;
 495
 496         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 497                 return -EINVAL;
 498
 499         err = kstrtoul(buf, 10, &max);
 500
 501         if (err)
 502                 return err;
 503
 504         if (max == 0)
 505                 sdp->no_write_same = 1;
 506         else if (max <= SD_MAX_WS16_BLOCKS) {
 507                 sdp->no_write_same = 0;
 508                 sdkp->max_ws_blocks = max;
 509         }
 510
 511         sd_config_write_same(sdkp);
 512
 513         return count;
 514 }
 515 static DEVICE_ATTR_RW(max_write_same_blocks);
 516
 517 static struct attribute *sd_disk_attrs[] = {
 518         &dev_attr_cache_type.attr,
 519         &dev_attr_FUA.attr,
 520         &dev_attr_allow_restart.attr,
 521         &dev_attr_manage_start_stop.attr,
 522         &dev_attr_protection_type.attr,
 523         &dev_attr_protection_mode.attr,
 524         &dev_attr_app_tag_own.attr,
 525         &dev_attr_thin_provisioning.attr,
 526         &dev_attr_provisioning_mode.attr,
 527         &dev_attr_zeroing_mode.attr,
 528         &dev_attr_max_write_same_blocks.attr,
 529         &dev_attr_max_medium_access_timeouts.attr,
 530         NULL,
 531 };
 532 ATTRIBUTE_GROUPS(sd_disk);
 533
 534 static struct class sd_disk_class = {
 535         .name           = "scsi_disk",
 536         .owner          = THIS_MODULE,
 537         .dev_release    = scsi_disk_release,
 538         .dev_groups     = sd_disk_groups,
 539 };
 540
 541 static const struct dev_pm_ops sd_pm_ops = {
 542         .suspend                = sd_suspend_system,
 543         .resume                 = sd_resume,
 544         .poweroff               = sd_suspend_system,
 545         .restore                = sd_resume,
 546         .runtime_suspend        = sd_suspend_runtime,
 547         .runtime_resume         = sd_resume,
 548 };
 549
 550 static struct scsi_driver sd_template = {
 551         .gendrv = {
 552                 .name           = "sd",
 553                 .owner          = THIS_MODULE,
 554                 .probe          = sd_probe,
 555                 .remove         = sd_remove,
 556                 .shutdown       = sd_shutdown,
 557                 .pm             = &sd_pm_ops,
 558         },
 559         .rescan                 = sd_rescan,
 560         .init_command           = sd_init_command,
 561         .uninit_command         = sd_uninit_command,
 562         .done                   = sd_done,
 563         .eh_action              = sd_eh_action,
 564         .eh_reset               = sd_eh_reset,
 565 };
 566
 567 /*
 568  * Dummy kobj_map->probe function.
 569  * The default ->probe function will call modprobe, which is
 570  * pointless as this module is already loaded.
 571  */
 572 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
 573 {
 574         return NULL;
 575 }
 576
 577 /*
 578  * Device no to disk mapping:
 579  *
 580  *       major         disc2     disc  p1
 581  *   |............|.............|....|....| <- dev_t
 582  *    31        20 19          8 7  4 3  0
 583  *
 584  * Inside a major, we have 16k disks, however mapped non-
 585  * contiguously. The first 16 disks are for major0, the next
 586  * ones with major1, ... Disk 256 is for major0 again, disk 272
 587  * for major1, ...
 588  * As we stay compatible with our numbering scheme, we can reuse
 589  * the well-know SCSI majors 8, 65--71, 136--143.
 590  */
 591 static int sd_major(int major_idx)
 592 {
 593         switch (major_idx) {
 594         case 0:
 595                 return SCSI_DISK0_MAJOR;
 596         case 1 ... 7:
 597                 return SCSI_DISK1_MAJOR + major_idx - 1;
 598         case 8 ... 15:
 599                 return SCSI_DISK8_MAJOR + major_idx - 8;
 600         default:
 601                 BUG();
 602                 return 0;       /* shut up gcc */
 603         }
 604 }
 605
 606 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 607 {
 608         struct scsi_disk *sdkp = NULL;
 609
 610         mutex_lock(&sd_ref_mutex);
 611
 612         if (disk->private_data) {
 613                 sdkp = scsi_disk(disk);
 614                 if (scsi_device_get(sdkp->device) == 0)
 615                         get_device(&sdkp->dev);
 616                 else
 617                         sdkp = NULL;
 618         }
 619         mutex_unlock(&sd_ref_mutex);
 620         return sdkp;
 621 }
 622
 623 static void scsi_disk_put(struct scsi_disk *sdkp)
 624 {
 625         struct scsi_device *sdev = sdkp->device;
 626
 627         mutex_lock(&sd_ref_mutex);
 628         put_device(&sdkp->dev);
 629         scsi_device_put(sdev);
 630         mutex_unlock(&sd_ref_mutex);
 631 }
 632
 633 #ifdef CONFIG_BLK_SED_OPAL
 634 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
 635                 size_t len, bool send)
 636 {
 637         struct scsi_device *sdev = data;
 638         u8 cdb[12] = { 0, };
 639         int ret;
 640
 641         cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
 642         cdb[1] = secp;
 643         put_unaligned_be16(spsp, &cdb[2]);
 644         put_unaligned_be32(len, &cdb[6]);
 645
 646         ret = scsi_execute_req(sdev, cdb,
 647                         send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
 648                         buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
 649         return ret <= 0 ? ret : -EIO;
 650 }
 651 #endif /* CONFIG_BLK_SED_OPAL */
 652
 653 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
 654                                            unsigned int dix, unsigned int dif)
 655 {
 656         struct bio *bio = scmd->request->bio;
 657         unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
 658         unsigned int protect = 0;
 659
 660         if (dix) {                              /* DIX Type 0, 1, 2, 3 */
 661                 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
 662                         scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
 663
 664                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 665                         scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
 666         }
 667
 668         if (dif != T10_PI_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
 669                 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
 670
 671                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 672                         scmd->prot_flags |= SCSI_PROT_REF_CHECK;
 673         }
 674
 675         if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
 676                 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
 677
 678                 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
 679                         protect = 3 << 5;       /* Disable target PI checking */
 680                 else
 681                         protect = 1 << 5;       /* Enable target PI checking */
 682         }
 683
 684         scsi_set_prot_op(scmd, prot_op);
 685         scsi_set_prot_type(scmd, dif);
 686         scmd->prot_flags &= sd_prot_flag_mask(prot_op);
 687
 688         return protect;
 689 }
 690
 691 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 692 {
 693         struct request_queue *q = sdkp->disk->queue;
 694         unsigned int logical_block_size = sdkp->device->sector_size;
 695         unsigned int max_blocks = 0;
 696
 697         q->limits.discard_alignment =
 698                 sdkp->unmap_alignment * logical_block_size;
 699         q->limits.discard_granularity =
 700                 max(sdkp->physical_block_size,
 701                     sdkp->unmap_granularity * logical_block_size);
 702         sdkp->provisioning_mode = mode;
 703
 704         switch (mode) {
 705
 706         case SD_LBP_FULL:
 707         case SD_LBP_DISABLE:
 708                 blk_queue_max_discard_sectors(q, 0);
 709                 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
 710                 return;
 711
 712         case SD_LBP_UNMAP:
 713                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 714                                           (u32)SD_MAX_WS16_BLOCKS);
 715                 break;
 716
 717         case SD_LBP_WS16:
 718                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 719                                           (u32)SD_MAX_WS16_BLOCKS);
 720                 break;
 721
 722         case SD_LBP_WS10:
 723                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 724                                           (u32)SD_MAX_WS10_BLOCKS);
 725                 break;
 726
 727         case SD_LBP_ZERO:
 728                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 729                                           (u32)SD_MAX_WS10_BLOCKS);
 730                 break;
 731         }
 732
 733         blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
 734         queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
 735 }
 736
 737 static int sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
 738 {
 739         struct scsi_device *sdp = cmd->device;
 740         struct request *rq = cmd->request;
 741         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 742         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 743         unsigned int data_len = 24;
 744         char *buf;
 745
 746         rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 747         if (!rq->special_vec.bv_page)
 748                 return BLKPREP_DEFER;
 749         rq->special_vec.bv_offset = 0;
 750         rq->special_vec.bv_len = data_len;
 751         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 752
 753         cmd->cmd_len = 10;
 754         cmd->cmnd[0] = UNMAP;
 755         cmd->cmnd[8] = 24;
 756
 757         buf = page_address(rq->special_vec.bv_page);
 758         put_unaligned_be16(6 + 16, &buf[0]);
 759         put_unaligned_be16(16, &buf[2]);
 760         put_unaligned_be64(sector, &buf[8]);
 761         put_unaligned_be32(nr_sectors, &buf[16]);
 762
 763         cmd->allowed = SD_MAX_RETRIES;
 764         cmd->transfersize = data_len;
 765         rq->timeout = SD_TIMEOUT;
 766         scsi_req(rq)->resid_len = data_len;
 767
 768         return scsi_init_io(cmd);
 769 }
 770
 771 static int sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd, bool unmap)
 772 {
 773         struct scsi_device *sdp = cmd->device;
 774         struct request *rq = cmd->request;
 775         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 776         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 777         u32 data_len = sdp->sector_size;
 778
 779         rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 780         if (!rq->special_vec.bv_page)
 781                 return BLKPREP_DEFER;
 782         rq->special_vec.bv_offset = 0;
 783         rq->special_vec.bv_len = data_len;
 784         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 785
 786         cmd->cmd_len = 16;
 787         cmd->cmnd[0] = WRITE_SAME_16;
 788         if (unmap)
 789                 cmd->cmnd[1] = 0x8; /* UNMAP */
 790         put_unaligned_be64(sector, &cmd->cmnd[2]);
 791         put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
 792
 793         cmd->allowed = SD_MAX_RETRIES;
 794         cmd->transfersize = data_len;
 795         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 796         scsi_req(rq)->resid_len = data_len;
 797
 798         return scsi_init_io(cmd);
 799 }
 800
 801 static int sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, bool unmap)
 802 {
 803         struct scsi_device *sdp = cmd->device;
 804         struct request *rq = cmd->request;
 805         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 806         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 807         u32 data_len = sdp->sector_size;
 808
 809         rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 810         if (!rq->special_vec.bv_page)
 811                 return BLKPREP_DEFER;
 812         rq->special_vec.bv_offset = 0;
 813         rq->special_vec.bv_len = data_len;
 814         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 815
 816         cmd->cmd_len = 10;
 817         cmd->cmnd[0] = WRITE_SAME;
 818         if (unmap)
 819                 cmd->cmnd[1] = 0x8; /* UNMAP */
 820         put_unaligned_be32(sector, &cmd->cmnd[2]);
 821         put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
 822
 823         cmd->allowed = SD_MAX_RETRIES;
 824         cmd->transfersize = data_len;
 825         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 826         scsi_req(rq)->resid_len = data_len;
 827
 828         return scsi_init_io(cmd);
 829 }
 830
 831 static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
 832 {
 833         struct request *rq = cmd->request;
 834         struct scsi_device *sdp = cmd->device;
 835         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 836         u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
 837         u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
 838         int ret;
 839
 840         if (!(rq->cmd_flags & REQ_NOUNMAP)) {
 841                 switch (sdkp->zeroing_mode) {
 842                 case SD_ZERO_WS16_UNMAP:
 843                         ret = sd_setup_write_same16_cmnd(cmd, true);
 844                         goto out;
 845                 case SD_ZERO_WS10_UNMAP:
 846                         ret = sd_setup_write_same10_cmnd(cmd, true);
 847                         goto out;
 848                 }
 849         }
 850
 851         if (sdp->no_write_same)
 852                 return BLKPREP_INVALID;
 853
 854         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
 855                 ret = sd_setup_write_same16_cmnd(cmd, false);
 856         else
 857                 ret = sd_setup_write_same10_cmnd(cmd, false);
 858
 859 out:
 860         if (sd_is_zoned(sdkp) && ret == BLKPREP_OK)
 861                 return sd_zbc_write_lock_zone(cmd);
 862
 863         return ret;
 864 }
 865
 866 static void sd_config_write_same(struct scsi_disk *sdkp)
 867 {
 868         struct request_queue *q = sdkp->disk->queue;
 869         unsigned int logical_block_size = sdkp->device->sector_size;
 870
 871         if (sdkp->device->no_write_same) {
 872                 sdkp->max_ws_blocks = 0;
 873                 goto out;
 874         }
 875
 876         /* Some devices can not handle block counts above 0xffff despite
 877          * supporting WRITE SAME(16). Consequently we default to 64k
 878          * blocks per I/O unless the device explicitly advertises a
 879          * bigger limit.
 880          */
 881         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 882                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 883                                                    (u32)SD_MAX_WS16_BLOCKS);
 884         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 885                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 886                                                    (u32)SD_MAX_WS10_BLOCKS);
 887         else {
 888                 sdkp->device->no_write_same = 1;
 889                 sdkp->max_ws_blocks = 0;
 890         }
 891
 892         if (sdkp->lbprz && sdkp->lbpws)
 893                 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
 894         else if (sdkp->lbprz && sdkp->lbpws10)
 895                 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
 896         else if (sdkp->max_ws_blocks)
 897                 sdkp->zeroing_mode = SD_ZERO_WS;
 898         else
 899                 sdkp->zeroing_mode = SD_ZERO_WRITE;
 900
 901 out:
 902         blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
 903                                          (logical_block_size >> 9));
 904         blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
 905                                          (logical_block_size >> 9));
 906 }
 907
 908 /**
 909  * sd_setup_write_same_cmnd - write the same data to multiple blocks
 910  * @cmd: command to prepare
 911  *
 912  * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
 913  * the preference indicated by the target device.
 914  **/
 915 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
 916 {
 917         struct request *rq = cmd->request;
 918         struct scsi_device *sdp = cmd->device;
 919         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 920         struct bio *bio = rq->bio;
 921         sector_t sector = blk_rq_pos(rq);
 922         unsigned int nr_sectors = blk_rq_sectors(rq);
 923         unsigned int nr_bytes = blk_rq_bytes(rq);
 924         int ret;
 925
 926         if (sdkp->device->no_write_same)
 927                 return BLKPREP_INVALID;
 928
 929         BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
 930
 931         if (sd_is_zoned(sdkp)) {
 932                 ret = sd_zbc_write_lock_zone(cmd);
 933                 if (ret != BLKPREP_OK)
 934                         return ret;
 935         }
 936
 937         sector >>= ilog2(sdp->sector_size) - 9;
 938         nr_sectors >>= ilog2(sdp->sector_size) - 9;
 939
 940         rq->timeout = SD_WRITE_SAME_TIMEOUT;
 941
 942         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
 943                 cmd->cmd_len = 16;
 944                 cmd->cmnd[0] = WRITE_SAME_16;
 945                 put_unaligned_be64(sector, &cmd->cmnd[2]);
 946                 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
 947         } else {
 948                 cmd->cmd_len = 10;
 949                 cmd->cmnd[0] = WRITE_SAME;
 950                 put_unaligned_be32(sector, &cmd->cmnd[2]);
 951                 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
 952         }
 953
 954         cmd->transfersize = sdp->sector_size;
 955         cmd->allowed = SD_MAX_RETRIES;
 956
 957         /*
 958          * For WRITE SAME the data transferred via the DATA OUT buffer is
 959          * different from the amount of data actually written to the target.
 960          *
 961          * We set up __data_len to the amount of data transferred via the
 962          * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
 963          * to transfer a single sector of data first, but then reset it to
 964          * the amount of data to be written right after so that the I/O path
 965          * knows how much to actually write.
 966          */
 967         rq->__data_len = sdp->sector_size;
 968         ret = scsi_init_io(cmd);
 969         rq->__data_len = nr_bytes;
 970
 971         if (sd_is_zoned(sdkp) && ret != BLKPREP_OK)
 972                 sd_zbc_write_unlock_zone(cmd);
 973
 974         return ret;
 975 }
 976
 977 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
 978 {
 979         struct request *rq = cmd->request;
 980
 981         /* flush requests don't perform I/O, zero the S/G table */
 982         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
 983
 984         cmd->cmnd[0] = SYNCHRONIZE_CACHE;
 985         cmd->cmd_len = 10;
 986         cmd->transfersize = 0;
 987         cmd->allowed = SD_MAX_RETRIES;
 988
 989         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
 990         return BLKPREP_OK;
 991 }
 992
 993 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
 994 {
 995         struct request *rq = SCpnt->request;
 996         struct scsi_device *sdp = SCpnt->device;
 997         struct gendisk *disk = rq->rq_disk;
 998         struct scsi_disk *sdkp = scsi_disk(disk);
 999         sector_t block = blk_rq_pos(rq);
1000         sector_t threshold;
1001         unsigned int this_count = blk_rq_sectors(rq);
1002         unsigned int dif, dix;
1003         bool zoned_write = sd_is_zoned(sdkp) && rq_data_dir(rq) == WRITE;
1004         int ret;
1005         unsigned char protect;
1006
1007         if (zoned_write) {
1008                 ret = sd_zbc_write_lock_zone(SCpnt);
1009                 if (ret != BLKPREP_OK)
1010                         return ret;
1011         }
1012
1013         ret = scsi_init_io(SCpnt);
1014         if (ret != BLKPREP_OK)
1015                 goto out;
1016         SCpnt = rq->special;
1017
1018         /* from here on until we're complete, any goto out
1019          * is used for a killable error condition */
1020         ret = BLKPREP_KILL;
1021
1022         SCSI_LOG_HLQUEUE(1,
1023                 scmd_printk(KERN_INFO, SCpnt,
1024                         "%s: block=%llu, count=%d\n",
1025                         __func__, (unsigned long long)block, this_count));
1026
1027         if (!sdp || !scsi_device_online(sdp) ||
1028             block + blk_rq_sectors(rq) > get_capacity(disk)) {
1029                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1030                                                 "Finishing %u sectors\n",
1031                                                 blk_rq_sectors(rq)));
1032                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1033                                                 "Retry with 0x%p\n", SCpnt));
1034                 goto out;
1035         }
1036
1037         if (sdp->changed) {
1038                 /*
1039                  * quietly refuse to do anything to a changed disc until
1040                  * the changed bit has been reset
1041                  */
1042                 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
1043                 goto out;
1044         }
1045
1046         /*
1047          * Some SD card readers can't handle multi-sector accesses which touch
1048          * the last one or two hardware sectors.  Split accesses as needed.
1049          */
1050         threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
1051                 (sdp->sector_size / 512);
1052
1053         if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
1054                 if (block < threshold) {
1055                         /* Access up to the threshold but not beyond */
1056                         this_count = threshold - block;
1057                 } else {
1058                         /* Access only a single hardware sector */
1059                         this_count = sdp->sector_size / 512;
1060                 }
1061         }
1062
1063         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
1064                                         (unsigned long long)block));
1065
1066         /*
1067          * If we have a 1K hardware sectorsize, prevent access to single
1068          * 512 byte sectors.  In theory we could handle this - in fact
1069          * the scsi cdrom driver must be able to handle this because
1070          * we typically use 1K blocksizes, and cdroms typically have
1071          * 2K hardware sectorsizes.  Of course, things are simpler
1072          * with the cdrom, since it is read-only.  For performance
1073          * reasons, the filesystems should be able to handle this
1074          * and not force the scsi disk driver to use bounce buffers
1075          * for this.
1076          */
1077         if (sdp->sector_size == 1024) {
1078                 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
1079                         scmd_printk(KERN_ERR, SCpnt,
1080                                     "Bad block number requested\n");
1081                         goto out;
1082                 } else {
1083                         block = block >> 1;
1084                         this_count = this_count >> 1;
1085                 }
1086         }
1087         if (sdp->sector_size == 2048) {
1088                 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
1089                         scmd_printk(KERN_ERR, SCpnt,
1090                                     "Bad block number requested\n");
1091                         goto out;
1092                 } else {
1093                         block = block >> 2;
1094                         this_count = this_count >> 2;
1095                 }
1096         }
1097         if (sdp->sector_size == 4096) {
1098                 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
1099                         scmd_printk(KERN_ERR, SCpnt,
1100                                     "Bad block number requested\n");
1101                         goto out;
1102                 } else {
1103                         block = block >> 3;
1104                         this_count = this_count >> 3;
1105                 }
1106         }
1107         if (rq_data_dir(rq) == WRITE) {
1108                 SCpnt->cmnd[0] = WRITE_6;
1109
1110                 if (blk_integrity_rq(rq))
1111                         sd_dif_prepare(SCpnt);
1112
1113         } else if (rq_data_dir(rq) == READ) {
1114                 SCpnt->cmnd[0] = READ_6;
1115         } else {
1116                 scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq));
1117                 goto out;
1118         }
1119
1120         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1121                                         "%s %d/%u 512 byte blocks.\n",
1122                                         (rq_data_dir(rq) == WRITE) ?
1123                                         "writing" : "reading", this_count,
1124                                         blk_rq_sectors(rq)));
1125
1126         dix = scsi_prot_sg_count(SCpnt);
1127         dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1128
1129         if (dif || dix)
1130                 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1131         else
1132                 protect = 0;
1133
1134         if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1135                 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1136
1137                 if (unlikely(SCpnt->cmnd == NULL)) {
1138                         ret = BLKPREP_DEFER;
1139                         goto out;
1140                 }
1141
1142                 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1143                 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1144                 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1145                 SCpnt->cmnd[7] = 0x18;
1146                 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1147                 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1148
1149                 /* LBA */
1150                 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1151                 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1152                 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1153                 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1154                 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1155                 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1156                 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1157                 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1158
1159                 /* Expected Indirect LBA */
1160                 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1161                 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1162                 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1163                 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1164
1165                 /* Transfer length */
1166                 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1167                 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1168                 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1169                 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1170         } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1171                 SCpnt->cmnd[0] += READ_16 - READ_6;
1172                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1173                 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1174                 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1175                 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1176                 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1177                 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1178                 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1179                 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1180                 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1181                 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1182                 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1183                 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1184                 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1185                 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1186         } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1187                    scsi_device_protection(SCpnt->device) ||
1188                    SCpnt->device->use_10_for_rw) {
1189                 SCpnt->cmnd[0] += READ_10 - READ_6;
1190                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1191                 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1192                 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1193                 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1194                 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1195                 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1196                 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1197                 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1198         } else {
1199                 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1200                         /*
1201                          * This happens only if this drive failed
1202                          * 10byte rw command with ILLEGAL_REQUEST
1203                          * during operation and thus turned off
1204                          * use_10_for_rw.
1205                          */
1206                         scmd_printk(KERN_ERR, SCpnt,
1207                                     "FUA write on READ/WRITE(6) drive\n");
1208                         goto out;
1209                 }
1210
1211                 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1212                 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1213                 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1214                 SCpnt->cmnd[4] = (unsigned char) this_count;
1215                 SCpnt->cmnd[5] = 0;
1216         }
1217         SCpnt->sdb.length = this_count * sdp->sector_size;
1218
1219         /*
1220          * We shouldn't disconnect in the middle of a sector, so with a dumb
1221          * host adapter, it's safe to assume that we can at least transfer
1222          * this many bytes between each connect / disconnect.
1223          */
1224         SCpnt->transfersize = sdp->sector_size;
1225         SCpnt->underflow = this_count << 9;
1226         SCpnt->allowed = SD_MAX_RETRIES;
1227
1228         /*
1229          * This indicates that the command is ready from our end to be
1230          * queued.
1231          */
1232         ret = BLKPREP_OK;
1233  out:
1234         if (zoned_write && ret != BLKPREP_OK)
1235                 sd_zbc_write_unlock_zone(SCpnt);
1236
1237         return ret;
1238 }
1239
1240 static int sd_init_command(struct scsi_cmnd *cmd)
1241 {
1242         struct request *rq = cmd->request;
1243
1244         switch (req_op(rq)) {
1245         case REQ_OP_DISCARD:
1246                 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1247                 case SD_LBP_UNMAP:
1248                         return sd_setup_unmap_cmnd(cmd);
1249                 case SD_LBP_WS16:
1250                         return sd_setup_write_same16_cmnd(cmd, true);
1251                 case SD_LBP_WS10:
1252                         return sd_setup_write_same10_cmnd(cmd, true);
1253                 case SD_LBP_ZERO:
1254                         return sd_setup_write_same10_cmnd(cmd, false);
1255                 default:
1256                         return BLKPREP_INVALID;
1257                 }
1258         case REQ_OP_WRITE_ZEROES:
1259                 return sd_setup_write_zeroes_cmnd(cmd);
1260         case REQ_OP_WRITE_SAME:
1261                 return sd_setup_write_same_cmnd(cmd);
1262         case REQ_OP_FLUSH:
1263                 return sd_setup_flush_cmnd(cmd);
1264         case REQ_OP_READ:
1265         case REQ_OP_WRITE:
1266                 return sd_setup_read_write_cmnd(cmd);
1267         case REQ_OP_ZONE_REPORT:
1268                 return sd_zbc_setup_report_cmnd(cmd);
1269         case REQ_OP_ZONE_RESET:
1270                 return sd_zbc_setup_reset_cmnd(cmd);
1271         default:
1272                 BUG();
1273         }
1274 }
1275
1276 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1277 {
1278         struct request *rq = SCpnt->request;
1279
1280         if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1281                 __free_page(rq->special_vec.bv_page);
1282
1283         if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1284                 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1285                 SCpnt->cmnd = NULL;
1286                 SCpnt->cmd_len = 0;
1287         }
1288 }
1289
1290 /**
1291  *      sd_open - open a scsi disk device
1292  *      @bdev: Block device of the scsi disk to open
1293  *      @mode: FMODE_* mask
1294  *
1295  *      Returns 0 if successful. Returns a negated errno value in case
1296  *      of error.
1297  *
1298  *      Note: This can be called from a user context (e.g. fsck(1) )
1299  *      or from within the kernel (e.g. as a result of a mount(1) ).
1300  *      In the latter case @inode and @filp carry an abridged amount
1301  *      of information as noted above.
1302  *
1303  *      Locking: called with bdev->bd_mutex held.
1304  **/
1305 static int sd_open(struct block_device *bdev, fmode_t mode)
1306 {
1307         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1308         struct scsi_device *sdev;
1309         int retval;
1310
1311         if (!sdkp)
1312                 return -ENXIO;
1313
1314         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1315
1316         sdev = sdkp->device;
1317
1318         /*
1319          * If the device is in error recovery, wait until it is done.
1320          * If the device is offline, then disallow any access to it.
1321          */
1322         retval = -ENXIO;
1323         if (!scsi_block_when_processing_errors(sdev))
1324                 goto error_out;
1325
1326         if (sdev->removable || sdkp->write_prot)
1327                 check_disk_change(bdev);
1328
1329         /*
1330          * If the drive is empty, just let the open fail.
1331          */
1332         retval = -ENOMEDIUM;
1333         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1334                 goto error_out;
1335
1336         /*
1337          * If the device has the write protect tab set, have the open fail
1338          * if the user expects to be able to write to the thing.
1339          */
1340         retval = -EROFS;
1341         if (sdkp->write_prot && (mode & FMODE_WRITE))
1342                 goto error_out;
1343
1344         /*
1345          * It is possible that the disk changing stuff resulted in
1346          * the device being taken offline.  If this is the case,
1347          * report this to the user, and don't pretend that the
1348          * open actually succeeded.
1349          */
1350         retval = -ENXIO;
1351         if (!scsi_device_online(sdev))
1352                 goto error_out;
1353
1354         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1355                 if (scsi_block_when_processing_errors(sdev))
1356                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1357         }
1358
1359         return 0;
1360
1361 error_out:
1362         scsi_disk_put(sdkp);
1363         return retval;
1364 }
1365
1366 /**
1367  *      sd_release - invoked when the (last) close(2) is called on this
1368  *      scsi disk.
1369  *      @disk: disk to release
1370  *      @mode: FMODE_* mask
1371  *
1372  *      Returns 0.
1373  *
1374  *      Note: may block (uninterruptible) if error recovery is underway
1375  *      on this disk.
1376  *
1377  *      Locking: called with bdev->bd_mutex held.
1378  **/
1379 static void sd_release(struct gendisk *disk, fmode_t mode)
1380 {
1381         struct scsi_disk *sdkp = scsi_disk(disk);
1382         struct scsi_device *sdev = sdkp->device;
1383
1384         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1385
1386         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1387                 if (scsi_block_when_processing_errors(sdev))
1388                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1389         }
1390
1391         /*
1392          * XXX and what if there are packets in flight and this close()
1393          * XXX is followed by a "rmmod sd_mod"?
1394          */
1395
1396         scsi_disk_put(sdkp);
1397 }
1398
1399 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1400 {
1401         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1402         struct scsi_device *sdp = sdkp->device;
1403         struct Scsi_Host *host = sdp->host;
1404         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1405         int diskinfo[4];
1406
1407         /* default to most commonly used values */
1408         diskinfo[0] = 0x40;     /* 1 << 6 */
1409         diskinfo[1] = 0x20;     /* 1 << 5 */
1410         diskinfo[2] = capacity >> 11;
1411
1412         /* override with calculated, extended default, or driver values */
1413         if (host->hostt->bios_param)
1414                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1415         else
1416                 scsicam_bios_param(bdev, capacity, diskinfo);
1417
1418         geo->heads = diskinfo[0];
1419         geo->sectors = diskinfo[1];
1420         geo->cylinders = diskinfo[2];
1421         return 0;
1422 }
1423
1424 /**
1425  *      sd_ioctl - process an ioctl
1426  *      @bdev: target block device
1427  *      @mode: FMODE_* mask
1428  *      @cmd: ioctl command number
1429  *      @arg: this is third argument given to ioctl(2) system call.
1430  *      Often contains a pointer.
1431  *
1432  *      Returns 0 if successful (some ioctls return positive numbers on
1433  *      success as well). Returns a negated errno value in case of error.
1434  *
1435  *      Note: most ioctls are forward onto the block subsystem or further
1436  *      down in the scsi subsystem.
1437  **/
1438 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1439                     unsigned int cmd, unsigned long arg)
1440 {
1441         struct gendisk *disk = bdev->bd_disk;
1442         struct scsi_disk *sdkp = scsi_disk(disk);
1443         struct scsi_device *sdp = sdkp->device;
1444         void __user *p = (void __user *)arg;
1445         int error;
1446
1447         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1448                                     "cmd=0x%x\n", disk->disk_name, cmd));
1449
1450         error = scsi_verify_blk_ioctl(bdev, cmd);
1451         if (error < 0)
1452                 return error;
1453
1454         /*
1455          * If we are in the middle of error recovery, don't let anyone
1456          * else try and use this device.  Also, if error recovery fails, it
1457          * may try and take the device offline, in which case all further
1458          * access to the device is prohibited.
1459          */
1460         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1461                         (mode & FMODE_NDELAY) != 0);
1462         if (error)
1463                 goto out;
1464
1465         if (is_sed_ioctl(cmd))
1466                 return sed_ioctl(sdkp->opal_dev, cmd, p);
1467
1468         /*
1469          * Send SCSI addressing ioctls directly to mid level, send other
1470          * ioctls to block level and then onto mid level if they can't be
1471          * resolved.
1472          */
1473         switch (cmd) {
1474                 case SCSI_IOCTL_GET_IDLUN:
1475                 case SCSI_IOCTL_GET_BUS_NUMBER:
1476                         error = scsi_ioctl(sdp, cmd, p);
1477                         break;
1478                 default:
1479                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1480                         if (error != -ENOTTY)
1481                                 break;
1482                         error = scsi_ioctl(sdp, cmd, p);
1483                         break;
1484         }
1485 out:
1486         return error;
1487 }
1488
1489 static void set_media_not_present(struct scsi_disk *sdkp)
1490 {
1491         if (sdkp->media_present)
1492                 sdkp->device->changed = 1;
1493
1494         if (sdkp->device->removable) {
1495                 sdkp->media_present = 0;
1496                 sdkp->capacity = 0;
1497         }
1498 }
1499
1500 static int media_not_present(struct scsi_disk *sdkp,
1501                              struct scsi_sense_hdr *sshdr)
1502 {
1503         if (!scsi_sense_valid(sshdr))
1504                 return 0;
1505
1506         /* not invoked for commands that could return deferred errors */
1507         switch (sshdr->sense_key) {
1508         case UNIT_ATTENTION:
1509         case NOT_READY:
1510                 /* medium not present */
1511                 if (sshdr->asc == 0x3A) {
1512                         set_media_not_present(sdkp);
1513                         return 1;
1514                 }
1515         }
1516         return 0;
1517 }
1518
1519 /**
1520  *      sd_check_events - check media events
1521  *      @disk: kernel device descriptor
1522  *      @clearing: disk events currently being cleared
1523  *
1524  *      Returns mask of DISK_EVENT_*.
1525  *
1526  *      Note: this function is invoked from the block subsystem.
1527  **/
1528 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1529 {
1530         struct scsi_disk *sdkp = scsi_disk_get(disk);
1531         struct scsi_device *sdp;
1532         int retval;
1533
1534         if (!sdkp)
1535                 return 0;
1536
1537         sdp = sdkp->device;
1538         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1539
1540         /*
1541          * If the device is offline, don't send any commands - just pretend as
1542          * if the command failed.  If the device ever comes back online, we
1543          * can deal with it then.  It is only because of unrecoverable errors
1544          * that we would ever take a device offline in the first place.
1545          */
1546         if (!scsi_device_online(sdp)) {
1547                 set_media_not_present(sdkp);
1548                 goto out;
1549         }
1550
1551         /*
1552          * Using TEST_UNIT_READY enables differentiation between drive with
1553          * no cartridge loaded - NOT READY, drive with changed cartridge -
1554          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1555          *
1556          * Drives that auto spin down. eg iomega jaz 1G, will be started
1557          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1558          * sd_revalidate() is called.
1559          */
1560         if (scsi_block_when_processing_errors(sdp)) {
1561                 struct scsi_sense_hdr sshdr = { 0, };
1562
1563                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1564                                               &sshdr);
1565
1566                 /* failed to execute TUR, assume media not present */
1567                 if (host_byte(retval)) {
1568                         set_media_not_present(sdkp);
1569                         goto out;
1570                 }
1571
1572                 if (media_not_present(sdkp, &sshdr))
1573                         goto out;
1574         }
1575
1576         /*
1577          * For removable scsi disk we have to recognise the presence
1578          * of a disk in the drive.
1579          */
1580         if (!sdkp->media_present)
1581                 sdp->changed = 1;
1582         sdkp->media_present = 1;
1583 out:
1584         /*
1585          * sdp->changed is set under the following conditions:
1586          *
1587          *      Medium present state has changed in either direction.
1588          *      Device has indicated UNIT_ATTENTION.
1589          */
1590         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1591         sdp->changed = 0;
1592         scsi_disk_put(sdkp);
1593         return retval;
1594 }
1595
1596 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1597 {
1598         int retries, res;
1599         struct scsi_device *sdp = sdkp->device;
1600         const int timeout = sdp->request_queue->rq_timeout
1601                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1602         struct scsi_sense_hdr my_sshdr;
1603
1604         if (!scsi_device_online(sdp))
1605                 return -ENODEV;
1606
1607         /* caller might not be interested in sense, but we need it */
1608         if (!sshdr)
1609                 sshdr = &my_sshdr;
1610
1611         for (retries = 3; retries > 0; --retries) {
1612                 unsigned char cmd[10] = { 0 };
1613
1614                 cmd[0] = SYNCHRONIZE_CACHE;
1615                 /*
1616                  * Leave the rest of the command zero to indicate
1617                  * flush everything.
1618                  */
1619                 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1620                                 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1621                 if (res == 0)
1622                         break;
1623         }
1624
1625         if (res) {
1626                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1627
1628                 if (driver_byte(res) & DRIVER_SENSE)
1629                         sd_print_sense_hdr(sdkp, sshdr);
1630
1631                 /* we need to evaluate the error return  */
1632                 if (scsi_sense_valid(sshdr) &&
1633                         (sshdr->asc == 0x3a ||  /* medium not present */
1634                          sshdr->asc == 0x20))   /* invalid command */
1635                                 /* this is no error here */
1636                                 return 0;
1637
1638                 switch (host_byte(res)) {
1639                 /* ignore errors due to racing a disconnection */
1640                 case DID_BAD_TARGET:
1641                 case DID_NO_CONNECT:
1642                         return 0;
1643                 /* signal the upper layer it might try again */
1644                 case DID_BUS_BUSY:
1645                 case DID_IMM_RETRY:
1646                 case DID_REQUEUE:
1647                 case DID_SOFT_ERROR:
1648                         return -EBUSY;
1649                 default:
1650                         return -EIO;
1651                 }
1652         }
1653         return 0;
1654 }
1655
1656 static void sd_rescan(struct device *dev)
1657 {
1658         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1659
1660         revalidate_disk(sdkp->disk);
1661 }
1662
1663
1664 #ifdef CONFIG_COMPAT
1665 /*
1666  * This gets directly called from VFS. When the ioctl
1667  * is not recognized we go back to the other translation paths.
1668  */
1669 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1670                            unsigned int cmd, unsigned long arg)
1671 {
1672         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1673         int error;
1674
1675         error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1676                         (mode & FMODE_NDELAY) != 0);
1677         if (error)
1678                 return error;
1679
1680         /*
1681          * Let the static ioctl translation table take care of it.
1682          */
1683         if (!sdev->host->hostt->compat_ioctl)
1684                 return -ENOIOCTLCMD;
1685         return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1686 }
1687 #endif
1688
1689 static char sd_pr_type(enum pr_type type)
1690 {
1691         switch (type) {
1692         case PR_WRITE_EXCLUSIVE:
1693                 return 0x01;
1694         case PR_EXCLUSIVE_ACCESS:
1695                 return 0x03;
1696         case PR_WRITE_EXCLUSIVE_REG_ONLY:
1697                 return 0x05;
1698         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1699                 return 0x06;
1700         case PR_WRITE_EXCLUSIVE_ALL_REGS:
1701                 return 0x07;
1702         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1703                 return 0x08;
1704         default:
1705                 return 0;
1706         }
1707 };
1708
1709 static int sd_pr_command(struct block_device *bdev, u8 sa,
1710                 u64 key, u64 sa_key, u8 type, u8 flags)
1711 {
1712         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1713         struct scsi_sense_hdr sshdr;
1714         int result;
1715         u8 cmd[16] = { 0, };
1716         u8 data[24] = { 0, };
1717
1718         cmd[0] = PERSISTENT_RESERVE_OUT;
1719         cmd[1] = sa;
1720         cmd[2] = type;
1721         put_unaligned_be32(sizeof(data), &cmd[5]);
1722
1723         put_unaligned_be64(key, &data[0]);
1724         put_unaligned_be64(sa_key, &data[8]);
1725         data[20] = flags;
1726
1727         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1728                         &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1729
1730         if ((driver_byte(result) & DRIVER_SENSE) &&
1731             (scsi_sense_valid(&sshdr))) {
1732                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1733                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1734         }
1735
1736         return result;
1737 }
1738
1739 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1740                 u32 flags)
1741 {
1742         if (flags & ~PR_FL_IGNORE_KEY)
1743                 return -EOPNOTSUPP;
1744         return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1745                         old_key, new_key, 0,
1746                         (1 << 0) /* APTPL */);
1747 }
1748
1749 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1750                 u32 flags)
1751 {
1752         if (flags)
1753                 return -EOPNOTSUPP;
1754         return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1755 }
1756
1757 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1758 {
1759         return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1760 }
1761
1762 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1763                 enum pr_type type, bool abort)
1764 {
1765         return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1766                              sd_pr_type(type), 0);
1767 }
1768
1769 static int sd_pr_clear(struct block_device *bdev, u64 key)
1770 {
1771         return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1772 }
1773
1774 static const struct pr_ops sd_pr_ops = {
1775         .pr_register    = sd_pr_register,
1776         .pr_reserve     = sd_pr_reserve,
1777         .pr_release     = sd_pr_release,
1778         .pr_preempt     = sd_pr_preempt,
1779         .pr_clear       = sd_pr_clear,
1780 };
1781
1782 static const struct block_device_operations sd_fops = {
1783         .owner                  = THIS_MODULE,
1784         .open                   = sd_open,
1785         .release                = sd_release,
1786         .ioctl                  = sd_ioctl,
1787         .getgeo                 = sd_getgeo,
1788 #ifdef CONFIG_COMPAT
1789         .compat_ioctl           = sd_compat_ioctl,
1790 #endif
1791         .check_events           = sd_check_events,
1792         .revalidate_disk        = sd_revalidate_disk,
1793         .unlock_native_capacity = sd_unlock_native_capacity,
1794         .pr_ops                 = &sd_pr_ops,
1795 };
1796
1797 /**
1798  *      sd_eh_reset - reset error handling callback
1799  *      @scmd:          sd-issued command that has failed
1800  *
1801  *      This function is called by the SCSI midlayer before starting
1802  *      SCSI EH. When counting medium access failures we have to be
1803  *      careful to register it only only once per device and SCSI EH run;
1804  *      there might be several timed out commands which will cause the
1805  *      'max_medium_access_timeouts' counter to trigger after the first
1806  *      SCSI EH run already and set the device to offline.
1807  *      So this function resets the internal counter before starting SCSI EH.
1808  **/
1809 static void sd_eh_reset(struct scsi_cmnd *scmd)
1810 {
1811         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1812
1813         /* New SCSI EH run, reset gate variable */
1814         sdkp->ignore_medium_access_errors = false;
1815 }
1816
1817 /**
1818  *      sd_eh_action - error handling callback
1819  *      @scmd:          sd-issued command that has failed
1820  *      @eh_disp:       The recovery disposition suggested by the midlayer
1821  *
1822  *      This function is called by the SCSI midlayer upon completion of an
1823  *      error test command (currently TEST UNIT READY). The result of sending
1824  *      the eh command is passed in eh_disp.  We're looking for devices that
1825  *      fail medium access commands but are OK with non access commands like
1826  *      test unit ready (so wrongly see the device as having a successful
1827  *      recovery)
1828  **/
1829 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1830 {
1831         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1832         struct scsi_device *sdev = scmd->device;
1833
1834         if (!scsi_device_online(sdev) ||
1835             !scsi_medium_access_command(scmd) ||
1836             host_byte(scmd->result) != DID_TIME_OUT ||
1837             eh_disp != SUCCESS)
1838                 return eh_disp;
1839
1840         /*
1841          * The device has timed out executing a medium access command.
1842          * However, the TEST UNIT READY command sent during error
1843          * handling completed successfully. Either the device is in the
1844          * process of recovering or has it suffered an internal failure
1845          * that prevents access to the storage medium.
1846          */
1847         if (!sdkp->ignore_medium_access_errors) {
1848                 sdkp->medium_access_timed_out++;
1849                 sdkp->ignore_medium_access_errors = true;
1850         }
1851
1852         /*
1853          * If the device keeps failing read/write commands but TEST UNIT
1854          * READY always completes successfully we assume that medium
1855          * access is no longer possible and take the device offline.
1856          */
1857         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1858                 scmd_printk(KERN_ERR, scmd,
1859                             "Medium access timeout failure. Offlining disk!\n");
1860                 mutex_lock(&sdev->state_mutex);
1861                 scsi_device_set_state(sdev, SDEV_OFFLINE);
1862                 mutex_unlock(&sdev->state_mutex);
1863
1864                 return SUCCESS;
1865         }
1866
1867         return eh_disp;
1868 }
1869
1870 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1871 {
1872         struct request *req = scmd->request;
1873         struct scsi_device *sdev = scmd->device;
1874         unsigned int transferred, good_bytes;
1875         u64 start_lba, end_lba, bad_lba;
1876
1877         /*
1878          * Some commands have a payload smaller than the device logical
1879          * block size (e.g. INQUIRY on a 4K disk).
1880          */
1881         if (scsi_bufflen(scmd) <= sdev->sector_size)
1882                 return 0;
1883
1884         /* Check if we have a 'bad_lba' information */
1885         if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1886                                      SCSI_SENSE_BUFFERSIZE,
1887                                      &bad_lba))
1888                 return 0;
1889
1890         /*
1891          * If the bad lba was reported incorrectly, we have no idea where
1892          * the error is.
1893          */
1894         start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1895         end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1896         if (bad_lba < start_lba || bad_lba >= end_lba)
1897                 return 0;
1898
1899         /*
1900          * resid is optional but mostly filled in.  When it's unused,
1901          * its value is zero, so we assume the whole buffer transferred
1902          */
1903         transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1904
1905         /* This computation should always be done in terms of the
1906          * resolution of the device's medium.
1907          */
1908         good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1909
1910         return min(good_bytes, transferred);
1911 }
1912
1913 /**
1914  *      sd_done - bottom half handler: called when the lower level
1915  *      driver has completed (successfully or otherwise) a scsi command.
1916  *      @SCpnt: mid-level's per command structure.
1917  *
1918  *      Note: potentially run from within an ISR. Must not block.
1919  **/
1920 static int sd_done(struct scsi_cmnd *SCpnt)
1921 {
1922         int result = SCpnt->result;
1923         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1924         unsigned int sector_size = SCpnt->device->sector_size;
1925         unsigned int resid;
1926         struct scsi_sense_hdr sshdr;
1927         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1928         struct request *req = SCpnt->request;
1929         int sense_valid = 0;
1930         int sense_deferred = 0;
1931
1932         switch (req_op(req)) {
1933         case REQ_OP_DISCARD:
1934         case REQ_OP_WRITE_ZEROES:
1935         case REQ_OP_WRITE_SAME:
1936         case REQ_OP_ZONE_RESET:
1937                 if (!result) {
1938                         good_bytes = blk_rq_bytes(req);
1939                         scsi_set_resid(SCpnt, 0);
1940                 } else {
1941                         good_bytes = 0;
1942                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1943                 }
1944                 break;
1945         case REQ_OP_ZONE_REPORT:
1946                 if (!result) {
1947                         good_bytes = scsi_bufflen(SCpnt)
1948                                 - scsi_get_resid(SCpnt);
1949                         scsi_set_resid(SCpnt, 0);
1950                 } else {
1951                         good_bytes = 0;
1952                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1953                 }
1954                 break;
1955         default:
1956                 /*
1957                  * In case of bogus fw or device, we could end up having
1958                  * an unaligned partial completion. Check this here and force
1959                  * alignment.
1960                  */
1961                 resid = scsi_get_resid(SCpnt);
1962                 if (resid & (sector_size - 1)) {
1963                         sd_printk(KERN_INFO, sdkp,
1964                                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1965                                 resid, sector_size);
1966                         resid = min(scsi_bufflen(SCpnt),
1967                                     round_up(resid, sector_size));
1968                         scsi_set_resid(SCpnt, resid);
1969                 }
1970         }
1971
1972         if (result) {
1973                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1974                 if (sense_valid)
1975                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1976         }
1977         sdkp->medium_access_timed_out = 0;
1978
1979         if (driver_byte(result) != DRIVER_SENSE &&
1980             (!sense_valid || sense_deferred))
1981                 goto out;
1982
1983         switch (sshdr.sense_key) {
1984         case HARDWARE_ERROR:
1985         case MEDIUM_ERROR:
1986                 good_bytes = sd_completed_bytes(SCpnt);
1987                 break;
1988         case RECOVERED_ERROR:
1989                 good_bytes = scsi_bufflen(SCpnt);
1990                 break;
1991         case NO_SENSE:
1992                 /* This indicates a false check condition, so ignore it.  An
1993                  * unknown amount of data was transferred so treat it as an
1994                  * error.
1995                  */
1996                 SCpnt->result = 0;
1997                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1998                 break;
1999         case ABORTED_COMMAND:
2000                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
2001                         good_bytes = sd_completed_bytes(SCpnt);
2002                 break;
2003         case ILLEGAL_REQUEST:
2004                 switch (sshdr.asc) {
2005                 case 0x10:      /* DIX: Host detected corruption */
2006                         good_bytes = sd_completed_bytes(SCpnt);
2007                         break;
2008                 case 0x20:      /* INVALID COMMAND OPCODE */
2009                 case 0x24:      /* INVALID FIELD IN CDB */
2010                         switch (SCpnt->cmnd[0]) {
2011                         case UNMAP:
2012                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2013                                 break;
2014                         case WRITE_SAME_16:
2015                         case WRITE_SAME:
2016                                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2017                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
2018                                 } else {
2019                                         sdkp->device->no_write_same = 1;
2020                                         sd_config_write_same(sdkp);
2021                                         req->__data_len = blk_rq_bytes(req);
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                 sd_dif_complete(SCpnt, good_bytes);
2042
2043         return good_bytes;
2044 }
2045
2046 /*
2047  * spinup disk - called only in sd_revalidate_disk()
2048  */
2049 static void
2050 sd_spinup_disk(struct scsi_disk *sdkp)
2051 {
2052         unsigned char cmd[10];
2053         unsigned long spintime_expire = 0;
2054         int retries, spintime;
2055         unsigned int the_result;
2056         struct scsi_sense_hdr sshdr;
2057         int sense_valid = 0;
2058
2059         spintime = 0;
2060
2061         /* Spin up drives, as required.  Only do this at boot time */
2062         /* Spinup needs to be done for module loads too. */
2063         do {
2064                 retries = 0;
2065
2066                 do {
2067                         cmd[0] = TEST_UNIT_READY;
2068                         memset((void *) &cmd[1], 0, 9);
2069
2070                         the_result = scsi_execute_req(sdkp->device, cmd,
2071                                                       DMA_NONE, NULL, 0,
2072                                                       &sshdr, SD_TIMEOUT,
2073                                                       SD_MAX_RETRIES, NULL);
2074
2075                         /*
2076                          * If the drive has indicated to us that it
2077                          * doesn't have any media in it, don't bother
2078                          * with any more polling.
2079                          */
2080                         if (media_not_present(sdkp, &sshdr))
2081                                 return;
2082
2083                         if (the_result)
2084                                 sense_valid = scsi_sense_valid(&sshdr);
2085                         retries++;
2086                 } while (retries < 3 &&
2087                          (!scsi_status_is_good(the_result) ||
2088                           ((driver_byte(the_result) & DRIVER_SENSE) &&
2089                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2090
2091                 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
2092                         /* no sense, TUR either succeeded or failed
2093                          * with a status error */
2094                         if(!spintime && !scsi_status_is_good(the_result)) {
2095                                 sd_print_result(sdkp, "Test Unit Ready failed",
2096                                                 the_result);
2097                         }
2098                         break;
2099                 }
2100
2101                 /*
2102                  * The device does not want the automatic start to be issued.
2103                  */
2104                 if (sdkp->device->no_start_on_add)
2105                         break;
2106
2107                 if (sense_valid && sshdr.sense_key == NOT_READY) {
2108                         if (sshdr.asc == 4 && sshdr.ascq == 3)
2109                                 break;  /* manual intervention required */
2110                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2111                                 break;  /* standby */
2112                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2113                                 break;  /* unavailable */
2114                         /*
2115                          * Issue command to spin up drive when not ready
2116                          */
2117                         if (!spintime) {
2118                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2119                                 cmd[0] = START_STOP;
2120                                 cmd[1] = 1;     /* Return immediately */
2121                                 memset((void *) &cmd[2], 0, 8);
2122                                 cmd[4] = 1;     /* Start spin cycle */
2123                                 if (sdkp->device->start_stop_pwr_cond)
2124                                         cmd[4] |= 1 << 4;
2125                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2126                                                  NULL, 0, &sshdr,
2127                                                  SD_TIMEOUT, SD_MAX_RETRIES,
2128                                                  NULL);
2129                                 spintime_expire = jiffies + 100 * HZ;
2130                                 spintime = 1;
2131                         }
2132                         /* Wait 1 second for next try */
2133                         msleep(1000);
2134                         printk(".");
2135
2136                 /*
2137                  * Wait for USB flash devices with slow firmware.
2138                  * Yes, this sense key/ASC combination shouldn't
2139                  * occur here.  It's characteristic of these devices.
2140                  */
2141                 } else if (sense_valid &&
2142                                 sshdr.sense_key == UNIT_ATTENTION &&
2143                                 sshdr.asc == 0x28) {
2144                         if (!spintime) {
2145                                 spintime_expire = jiffies + 5 * HZ;
2146                                 spintime = 1;
2147                         }
2148                         /* Wait 1 second for next try */
2149                         msleep(1000);
2150                 } else {
2151                         /* we don't understand the sense code, so it's
2152                          * probably pointless to loop */
2153                         if(!spintime) {
2154                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2155                                 sd_print_sense_hdr(sdkp, &sshdr);
2156                         }
2157                         break;
2158                 }
2159
2160         } while (spintime && time_before_eq(jiffies, spintime_expire));
2161
2162         if (spintime) {
2163                 if (scsi_status_is_good(the_result))
2164                         printk("ready\n");
2165                 else
2166                         printk("not responding...\n");
2167         }
2168 }
2169
2170 /*
2171  * Determine whether disk supports Data Integrity Field.
2172  */
2173 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2174 {
2175         struct scsi_device *sdp = sdkp->device;
2176         u8 type;
2177         int ret = 0;
2178
2179         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2180                 return ret;
2181
2182         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2183
2184         if (type > T10_PI_TYPE3_PROTECTION)
2185                 ret = -ENODEV;
2186         else if (scsi_host_dif_capable(sdp->host, type))
2187                 ret = 1;
2188
2189         if (sdkp->first_scan || type != sdkp->protection_type)
2190                 switch (ret) {
2191                 case -ENODEV:
2192                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2193                                   " protection type %u. Disabling disk!\n",
2194                                   type);
2195                         break;
2196                 case 1:
2197                         sd_printk(KERN_NOTICE, sdkp,
2198                                   "Enabling DIF Type %u protection\n", type);
2199                         break;
2200                 case 0:
2201                         sd_printk(KERN_NOTICE, sdkp,
2202                                   "Disabling DIF Type %u protection\n", type);
2203                         break;
2204                 }
2205
2206         sdkp->protection_type = type;
2207
2208         return ret;
2209 }
2210
2211 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2212                         struct scsi_sense_hdr *sshdr, int sense_valid,
2213                         int the_result)
2214 {
2215         if (driver_byte(the_result) & DRIVER_SENSE)
2216                 sd_print_sense_hdr(sdkp, sshdr);
2217         else
2218                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2219
2220         /*
2221          * Set dirty bit for removable devices if not ready -
2222          * sometimes drives will not report this properly.
2223          */
2224         if (sdp->removable &&
2225             sense_valid && sshdr->sense_key == NOT_READY)
2226                 set_media_not_present(sdkp);
2227
2228         /*
2229          * We used to set media_present to 0 here to indicate no media
2230          * in the drive, but some drives fail read capacity even with
2231          * media present, so we can't do that.
2232          */
2233         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2234 }
2235
2236 #define RC16_LEN 32
2237 #if RC16_LEN > SD_BUF_SIZE
2238 #error RC16_LEN must not be more than SD_BUF_SIZE
2239 #endif
2240
2241 #define READ_CAPACITY_RETRIES_ON_RESET  10
2242
2243 /*
2244  * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
2245  * and the reported logical block size is bigger than 512 bytes. Note
2246  * that last_sector is a u64 and therefore logical_to_sectors() is not
2247  * applicable.
2248  */
2249 static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
2250 {
2251         u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
2252
2253         if (sizeof(sector_t) == 4 && last_sector > U32_MAX)
2254                 return false;
2255
2256         return true;
2257 }
2258
2259 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2260                                                 unsigned char *buffer)
2261 {
2262         unsigned char cmd[16];
2263         struct scsi_sense_hdr sshdr;
2264         int sense_valid = 0;
2265         int the_result;
2266         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2267         unsigned int alignment;
2268         unsigned long long lba;
2269         unsigned sector_size;
2270
2271         if (sdp->no_read_capacity_16)
2272                 return -EINVAL;
2273
2274         do {
2275                 memset(cmd, 0, 16);
2276                 cmd[0] = SERVICE_ACTION_IN_16;
2277                 cmd[1] = SAI_READ_CAPACITY_16;
2278                 cmd[13] = RC16_LEN;
2279                 memset(buffer, 0, RC16_LEN);
2280
2281                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2282                                         buffer, RC16_LEN, &sshdr,
2283                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2284
2285                 if (media_not_present(sdkp, &sshdr))
2286                         return -ENODEV;
2287
2288                 if (the_result) {
2289                         sense_valid = scsi_sense_valid(&sshdr);
2290                         if (sense_valid &&
2291                             sshdr.sense_key == ILLEGAL_REQUEST &&
2292                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2293                             sshdr.ascq == 0x00)
2294                                 /* Invalid Command Operation Code or
2295                                  * Invalid Field in CDB, just retry
2296                                  * silently with RC10 */
2297                                 return -EINVAL;
2298                         if (sense_valid &&
2299                             sshdr.sense_key == UNIT_ATTENTION &&
2300                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2301                                 /* Device reset might occur several times,
2302                                  * give it one more chance */
2303                                 if (--reset_retries > 0)
2304                                         continue;
2305                 }
2306                 retries--;
2307
2308         } while (the_result && retries);
2309
2310         if (the_result) {
2311                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2312                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2313                 return -EINVAL;
2314         }
2315
2316         sector_size = get_unaligned_be32(&buffer[8]);
2317         lba = get_unaligned_be64(&buffer[0]);
2318
2319         if (sd_read_protection_type(sdkp, buffer) < 0) {
2320                 sdkp->capacity = 0;
2321                 return -ENODEV;
2322         }
2323
2324         if (!sd_addressable_capacity(lba, sector_size)) {
2325                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2326                         "kernel compiled with support for large block "
2327                         "devices.\n");
2328                 sdkp->capacity = 0;
2329                 return -EOVERFLOW;
2330         }
2331
2332         /* Logical blocks per physical block exponent */
2333         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2334
2335         /* RC basis */
2336         sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2337
2338         /* Lowest aligned logical block */
2339         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2340         blk_queue_alignment_offset(sdp->request_queue, alignment);
2341         if (alignment && sdkp->first_scan)
2342                 sd_printk(KERN_NOTICE, sdkp,
2343                           "physical block alignment offset: %u\n", alignment);
2344
2345         if (buffer[14] & 0x80) { /* LBPME */
2346                 sdkp->lbpme = 1;
2347
2348                 if (buffer[14] & 0x40) /* LBPRZ */
2349                         sdkp->lbprz = 1;
2350
2351                 sd_config_discard(sdkp, SD_LBP_WS16);
2352         }
2353
2354         sdkp->capacity = lba + 1;
2355         return sector_size;
2356 }
2357
2358 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2359                                                 unsigned char *buffer)
2360 {
2361         unsigned char cmd[16];
2362         struct scsi_sense_hdr sshdr;
2363         int sense_valid = 0;
2364         int the_result;
2365         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2366         sector_t lba;
2367         unsigned sector_size;
2368
2369         do {
2370                 cmd[0] = READ_CAPACITY;
2371                 memset(&cmd[1], 0, 9);
2372                 memset(buffer, 0, 8);
2373
2374                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2375                                         buffer, 8, &sshdr,
2376                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2377
2378                 if (media_not_present(sdkp, &sshdr))
2379                         return -ENODEV;
2380
2381                 if (the_result) {
2382                         sense_valid = scsi_sense_valid(&sshdr);
2383                         if (sense_valid &&
2384                             sshdr.sense_key == UNIT_ATTENTION &&
2385                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2386                                 /* Device reset might occur several times,
2387                                  * give it one more chance */
2388                                 if (--reset_retries > 0)
2389                                         continue;
2390                 }
2391                 retries--;
2392
2393         } while (the_result && retries);
2394
2395         if (the_result) {
2396                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2397                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2398                 return -EINVAL;
2399         }
2400
2401         sector_size = get_unaligned_be32(&buffer[4]);
2402         lba = get_unaligned_be32(&buffer[0]);
2403
2404         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2405                 /* Some buggy (usb cardreader) devices return an lba of
2406                    0xffffffff when the want to report a size of 0 (with
2407                    which they really mean no media is present) */
2408                 sdkp->capacity = 0;
2409                 sdkp->physical_block_size = sector_size;
2410                 return sector_size;
2411         }
2412
2413         if (!sd_addressable_capacity(lba, sector_size)) {
2414                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2415                         "kernel compiled with support for large block "
2416                         "devices.\n");
2417                 sdkp->capacity = 0;
2418                 return -EOVERFLOW;
2419         }
2420
2421         sdkp->capacity = lba + 1;
2422         sdkp->physical_block_size = sector_size;
2423         return sector_size;
2424 }
2425
2426 static int sd_try_rc16_first(struct scsi_device *sdp)
2427 {
2428         if (sdp->host->max_cmd_len < 16)
2429                 return 0;
2430         if (sdp->try_rc_10_first)
2431                 return 0;
2432         if (sdp->scsi_level > SCSI_SPC_2)
2433                 return 1;
2434         if (scsi_device_protection(sdp))
2435                 return 1;
2436         return 0;
2437 }
2438
2439 /*
2440  * read disk capacity
2441  */
2442 static void
2443 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2444 {
2445         int sector_size;
2446         struct scsi_device *sdp = sdkp->device;
2447
2448         if (sd_try_rc16_first(sdp)) {
2449                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2450                 if (sector_size == -EOVERFLOW)
2451                         goto got_data;
2452                 if (sector_size == -ENODEV)
2453                         return;
2454                 if (sector_size < 0)
2455                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2456                 if (sector_size < 0)
2457                         return;
2458         } else {
2459                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2460                 if (sector_size == -EOVERFLOW)
2461                         goto got_data;
2462                 if (sector_size < 0)
2463                         return;
2464                 if ((sizeof(sdkp->capacity) > 4) &&
2465                     (sdkp->capacity > 0xffffffffULL)) {
2466                         int old_sector_size = sector_size;
2467                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2468                                         "Trying to use READ CAPACITY(16).\n");
2469                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2470                         if (sector_size < 0) {
2471                                 sd_printk(KERN_NOTICE, sdkp,
2472                                         "Using 0xffffffff as device size\n");
2473                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2474                                 sector_size = old_sector_size;
2475                                 goto got_data;
2476                         }
2477                 }
2478         }
2479
2480         /* Some devices are known to return the total number of blocks,
2481          * not the highest block number.  Some devices have versions
2482          * which do this and others which do not.  Some devices we might
2483          * suspect of doing this but we don't know for certain.
2484          *
2485          * If we know the reported capacity is wrong, decrement it.  If
2486          * we can only guess, then assume the number of blocks is even
2487          * (usually true but not always) and err on the side of lowering
2488          * the capacity.
2489          */
2490         if (sdp->fix_capacity ||
2491             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2492                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2493                                 "from its reported value: %llu\n",
2494                                 (unsigned long long) sdkp->capacity);
2495                 --sdkp->capacity;
2496         }
2497
2498 got_data:
2499         if (sector_size == 0) {
2500                 sector_size = 512;
2501                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2502                           "assuming 512.\n");
2503         }
2504
2505         if (sector_size != 512 &&
2506             sector_size != 1024 &&
2507             sector_size != 2048 &&
2508             sector_size != 4096) {
2509                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2510                           sector_size);
2511                 /*
2512                  * The user might want to re-format the drive with
2513                  * a supported sectorsize.  Once this happens, it
2514                  * would be relatively trivial to set the thing up.
2515                  * For this reason, we leave the thing in the table.
2516                  */
2517                 sdkp->capacity = 0;
2518                 /*
2519                  * set a bogus sector size so the normal read/write
2520                  * logic in the block layer will eventually refuse any
2521                  * request on this device without tripping over power
2522                  * of two sector size assumptions
2523                  */
2524                 sector_size = 512;
2525         }
2526         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2527         blk_queue_physical_block_size(sdp->request_queue,
2528                                       sdkp->physical_block_size);
2529         sdkp->device->sector_size = sector_size;
2530
2531         if (sdkp->capacity > 0xffffffff)
2532                 sdp->use_16_for_rw = 1;
2533
2534 }
2535
2536 /*
2537  * Print disk capacity
2538  */
2539 static void
2540 sd_print_capacity(struct scsi_disk *sdkp,
2541                   sector_t old_capacity)
2542 {
2543         int sector_size = sdkp->device->sector_size;
2544         char cap_str_2[10], cap_str_10[10];
2545
2546         string_get_size(sdkp->capacity, sector_size,
2547                         STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2548         string_get_size(sdkp->capacity, sector_size,
2549                         STRING_UNITS_10, cap_str_10,
2550                         sizeof(cap_str_10));
2551
2552         if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2553                 sd_printk(KERN_NOTICE, sdkp,
2554                           "%llu %d-byte logical blocks: (%s/%s)\n",
2555                           (unsigned long long)sdkp->capacity,
2556                           sector_size, cap_str_10, cap_str_2);
2557
2558                 if (sdkp->physical_block_size != sector_size)
2559                         sd_printk(KERN_NOTICE, sdkp,
2560                                   "%u-byte physical blocks\n",
2561                                   sdkp->physical_block_size);
2562
2563                 sd_zbc_print_zones(sdkp);
2564         }
2565 }
2566
2567 /* called with buffer of length 512 */
2568 static inline int
2569 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2570                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2571                  struct scsi_sense_hdr *sshdr)
2572 {
2573         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2574                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2575                                sshdr);
2576 }
2577
2578 /*
2579  * read write protect setting, if possible - called only in sd_revalidate_disk()
2580  * called with buffer of length SD_BUF_SIZE
2581  */
2582 static void
2583 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2584 {
2585         int res;
2586         struct scsi_device *sdp = sdkp->device;
2587         struct scsi_mode_data data;
2588         int old_wp = sdkp->write_prot;
2589
2590         set_disk_ro(sdkp->disk, 0);
2591         if (sdp->skip_ms_page_3f) {
2592                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2593                 return;
2594         }
2595
2596         if (sdp->use_192_bytes_for_3f) {
2597                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2598         } else {
2599                 /*
2600                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2601                  * We have to start carefully: some devices hang if we ask
2602                  * for more than is available.
2603                  */
2604                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2605
2606                 /*
2607                  * Second attempt: ask for page 0 When only page 0 is
2608                  * implemented, a request for page 3F may return Sense Key
2609                  * 5: Illegal Request, Sense Code 24: Invalid field in
2610                  * CDB.
2611                  */
2612                 if (!scsi_status_is_good(res))
2613                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2614
2615                 /*
2616                  * Third attempt: ask 255 bytes, as we did earlier.
2617                  */
2618                 if (!scsi_status_is_good(res))
2619                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2620                                                &data, NULL);
2621         }
2622
2623         if (!scsi_status_is_good(res)) {
2624                 sd_first_printk(KERN_WARNING, sdkp,
2625                           "Test WP failed, assume Write Enabled\n");
2626         } else {
2627                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2628                 set_disk_ro(sdkp->disk, sdkp->write_prot);
2629                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2630                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2631                                   sdkp->write_prot ? "on" : "off");
2632                         sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2633                 }
2634         }
2635 }
2636
2637 /*
2638  * sd_read_cache_type - called only from sd_revalidate_disk()
2639  * called with buffer of length SD_BUF_SIZE
2640  */
2641 static void
2642 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2643 {
2644         int len = 0, res;
2645         struct scsi_device *sdp = sdkp->device;
2646
2647         int dbd;
2648         int modepage;
2649         int first_len;
2650         struct scsi_mode_data data;
2651         struct scsi_sense_hdr sshdr;
2652         int old_wce = sdkp->WCE;
2653         int old_rcd = sdkp->RCD;
2654         int old_dpofua = sdkp->DPOFUA;
2655
2656
2657         if (sdkp->cache_override)
2658                 return;
2659
2660         first_len = 4;
2661         if (sdp->skip_ms_page_8) {
2662                 if (sdp->type == TYPE_RBC)
2663                         goto defaults;
2664                 else {
2665                         if (sdp->skip_ms_page_3f)
2666                                 goto defaults;
2667                         modepage = 0x3F;
2668                         if (sdp->use_192_bytes_for_3f)
2669                                 first_len = 192;
2670                         dbd = 0;
2671                 }
2672         } else if (sdp->type == TYPE_RBC) {
2673                 modepage = 6;
2674                 dbd = 8;
2675         } else {
2676                 modepage = 8;
2677                 dbd = 0;
2678         }
2679
2680         /* cautiously ask */
2681         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2682                         &data, &sshdr);
2683
2684         if (!scsi_status_is_good(res))
2685                 goto bad_sense;
2686
2687         if (!data.header_length) {
2688                 modepage = 6;
2689                 first_len = 0;
2690                 sd_first_printk(KERN_ERR, sdkp,
2691                                 "Missing header in MODE_SENSE response\n");
2692         }
2693
2694         /* that went OK, now ask for the proper length */
2695         len = data.length;
2696
2697         /*
2698          * We're only interested in the first three bytes, actually.
2699          * But the data cache page is defined for the first 20.
2700          */
2701         if (len < 3)
2702                 goto bad_sense;
2703         else if (len > SD_BUF_SIZE) {
2704                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2705                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2706                 len = SD_BUF_SIZE;
2707         }
2708         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2709                 len = 192;
2710
2711         /* Get the data */
2712         if (len > first_len)
2713                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2714                                 &data, &sshdr);
2715
2716         if (scsi_status_is_good(res)) {
2717                 int offset = data.header_length + data.block_descriptor_length;
2718
2719                 while (offset < len) {
2720                         u8 page_code = buffer[offset] & 0x3F;
2721                         u8 spf       = buffer[offset] & 0x40;
2722
2723                         if (page_code == 8 || page_code == 6) {
2724                                 /* We're interested only in the first 3 bytes.
2725                                  */
2726                                 if (len - offset <= 2) {
2727                                         sd_first_printk(KERN_ERR, sdkp,
2728                                                 "Incomplete mode parameter "
2729                                                         "data\n");
2730                                         goto defaults;
2731                                 } else {
2732                                         modepage = page_code;
2733                                         goto Page_found;
2734                                 }
2735                         } else {
2736                                 /* Go to the next page */
2737                                 if (spf && len - offset > 3)
2738                                         offset += 4 + (buffer[offset+2] << 8) +
2739                                                 buffer[offset+3];
2740                                 else if (!spf && len - offset > 1)
2741                                         offset += 2 + buffer[offset+1];
2742                                 else {
2743                                         sd_first_printk(KERN_ERR, sdkp,
2744                                                         "Incomplete mode "
2745                                                         "parameter data\n");
2746                                         goto defaults;
2747                                 }
2748                         }
2749                 }
2750
2751                 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2752                 goto defaults;
2753
2754         Page_found:
2755                 if (modepage == 8) {
2756                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2757                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2758                 } else {
2759                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2760                         sdkp->RCD = 0;
2761                 }
2762
2763                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2764                 if (sdp->broken_fua) {
2765                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2766                         sdkp->DPOFUA = 0;
2767                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2768                            !sdkp->device->use_16_for_rw) {
2769                         sd_first_printk(KERN_NOTICE, sdkp,
2770                                   "Uses READ/WRITE(6), disabling FUA\n");
2771                         sdkp->DPOFUA = 0;
2772                 }
2773
2774                 /* No cache flush allowed for write protected devices */
2775                 if (sdkp->WCE && sdkp->write_prot)
2776                         sdkp->WCE = 0;
2777
2778                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2779                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2780                         sd_printk(KERN_NOTICE, sdkp,
2781                                   "Write cache: %s, read cache: %s, %s\n",
2782                                   sdkp->WCE ? "enabled" : "disabled",
2783                                   sdkp->RCD ? "disabled" : "enabled",
2784                                   sdkp->DPOFUA ? "supports DPO and FUA"
2785                                   : "doesn't support DPO or FUA");
2786
2787                 return;
2788         }
2789
2790 bad_sense:
2791         if (scsi_sense_valid(&sshdr) &&
2792             sshdr.sense_key == ILLEGAL_REQUEST &&
2793             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2794                 /* Invalid field in CDB */
2795                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2796         else
2797                 sd_first_printk(KERN_ERR, sdkp,
2798                                 "Asking for cache data failed\n");
2799
2800 defaults:
2801         if (sdp->wce_default_on) {
2802                 sd_first_printk(KERN_NOTICE, sdkp,
2803                                 "Assuming drive cache: write back\n");
2804                 sdkp->WCE = 1;
2805         } else {
2806                 sd_first_printk(KERN_ERR, sdkp,
2807                                 "Assuming drive cache: write through\n");
2808                 sdkp->WCE = 0;
2809         }
2810         sdkp->RCD = 0;
2811         sdkp->DPOFUA = 0;
2812 }
2813
2814 /*
2815  * The ATO bit indicates whether the DIF application tag is available
2816  * for use by the operating system.
2817  */
2818 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2819 {
2820         int res, offset;
2821         struct scsi_device *sdp = sdkp->device;
2822         struct scsi_mode_data data;
2823         struct scsi_sense_hdr sshdr;
2824
2825         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2826                 return;
2827
2828         if (sdkp->protection_type == 0)
2829                 return;
2830
2831         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2832                               SD_MAX_RETRIES, &data, &sshdr);
2833
2834         if (!scsi_status_is_good(res) || !data.header_length ||
2835             data.length < 6) {
2836                 sd_first_printk(KERN_WARNING, sdkp,
2837                           "getting Control mode page failed, assume no ATO\n");
2838
2839                 if (scsi_sense_valid(&sshdr))
2840                         sd_print_sense_hdr(sdkp, &sshdr);
2841
2842                 return;
2843         }
2844
2845         offset = data.header_length + data.block_descriptor_length;
2846
2847         if ((buffer[offset] & 0x3f) != 0x0a) {
2848                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2849                 return;
2850         }
2851
2852         if ((buffer[offset + 5] & 0x80) == 0)
2853                 return;
2854
2855         sdkp->ATO = 1;
2856
2857         return;
2858 }
2859
2860 /**
2861  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2862  * @sdkp: disk to query
2863  */
2864 static void sd_read_block_limits(struct scsi_disk *sdkp)
2865 {
2866         unsigned int sector_sz = sdkp->device->sector_size;
2867         const int vpd_len = 64;
2868         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2869
2870         if (!buffer ||
2871             /* Block Limits VPD */
2872             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2873                 goto out;
2874
2875         blk_queue_io_min(sdkp->disk->queue,
2876                          get_unaligned_be16(&buffer[6]) * sector_sz);
2877
2878         sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2879         sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2880
2881         if (buffer[3] == 0x3c) {
2882                 unsigned int lba_count, desc_count;
2883
2884                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2885
2886                 if (!sdkp->lbpme)
2887                         goto out;
2888
2889                 lba_count = get_unaligned_be32(&buffer[20]);
2890                 desc_count = get_unaligned_be32(&buffer[24]);
2891
2892                 if (lba_count && desc_count)
2893                         sdkp->max_unmap_blocks = lba_count;
2894
2895                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2896
2897                 if (buffer[32] & 0x80)
2898                         sdkp->unmap_alignment =
2899                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2900
2901                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2902
2903                         if (sdkp->max_unmap_blocks)
2904                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2905                         else
2906                                 sd_config_discard(sdkp, SD_LBP_WS16);
2907
2908                 } else {        /* LBP VPD page tells us what to use */
2909                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2910                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2911                         else if (sdkp->lbpws)
2912                                 sd_config_discard(sdkp, SD_LBP_WS16);
2913                         else if (sdkp->lbpws10)
2914                                 sd_config_discard(sdkp, SD_LBP_WS10);
2915                         else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2916                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2917                         else
2918                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2919                 }
2920         }
2921
2922  out:
2923         kfree(buffer);
2924 }
2925
2926 /**
2927  * sd_read_block_characteristics - Query block dev. characteristics
2928  * @sdkp: disk to query
2929  */
2930 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2931 {
2932         struct request_queue *q = sdkp->disk->queue;
2933         unsigned char *buffer;
2934         u16 rot;
2935         const int vpd_len = 64;
2936
2937         buffer = kmalloc(vpd_len, GFP_KERNEL);
2938
2939         if (!buffer ||
2940             /* Block Device Characteristics VPD */
2941             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2942                 goto out;
2943
2944         rot = get_unaligned_be16(&buffer[4]);
2945
2946         if (rot == 1) {
2947                 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
2948                 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
2949         }
2950
2951         if (sdkp->device->type == TYPE_ZBC) {
2952                 /* Host-managed */
2953                 q->limits.zoned = BLK_ZONED_HM;
2954         } else {
2955                 sdkp->zoned = (buffer[8] >> 4) & 3;
2956                 if (sdkp->zoned == 1)
2957                         /* Host-aware */
2958                         q->limits.zoned = BLK_ZONED_HA;
2959                 else
2960                         /*
2961                          * Treat drive-managed devices as
2962                          * regular block devices.
2963                          */
2964                         q->limits.zoned = BLK_ZONED_NONE;
2965         }
2966         if (blk_queue_is_zoned(q) && sdkp->first_scan)
2967                 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2968                       q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2969
2970  out:
2971         kfree(buffer);
2972 }
2973
2974 /**
2975  * sd_read_block_provisioning - Query provisioning VPD page
2976  * @sdkp: disk to query
2977  */
2978 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2979 {
2980         unsigned char *buffer;
2981         const int vpd_len = 8;
2982
2983         if (sdkp->lbpme == 0)
2984                 return;
2985
2986         buffer = kmalloc(vpd_len, GFP_KERNEL);
2987
2988         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2989                 goto out;
2990
2991         sdkp->lbpvpd    = 1;
2992         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2993         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2994         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2995
2996  out:
2997         kfree(buffer);
2998 }
2999
3000 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
3001 {
3002         struct scsi_device *sdev = sdkp->device;
3003
3004         if (sdev->host->no_write_same) {
3005                 sdev->no_write_same = 1;
3006
3007                 return;
3008         }
3009
3010         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
3011                 /* too large values might cause issues with arcmsr */
3012                 int vpd_buf_len = 64;
3013
3014                 sdev->no_report_opcodes = 1;
3015
3016                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3017                  * CODES is unsupported and the device has an ATA
3018                  * Information VPD page (SAT).
3019                  */
3020                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3021                         sdev->no_write_same = 1;
3022         }
3023
3024         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3025                 sdkp->ws16 = 1;
3026
3027         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3028                 sdkp->ws10 = 1;
3029 }
3030
3031 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3032 {
3033         struct scsi_device *sdev = sdkp->device;
3034
3035         if (!sdev->security_supported)
3036                 return;
3037
3038         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3039                         SECURITY_PROTOCOL_IN) == 1 &&
3040             scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3041                         SECURITY_PROTOCOL_OUT) == 1)
3042                 sdkp->security = 1;
3043 }
3044
3045 /**
3046  *      sd_revalidate_disk - called the first time a new disk is seen,
3047  *      performs disk spin up, read_capacity, etc.
3048  *      @disk: struct gendisk we care about
3049  **/
3050 static int sd_revalidate_disk(struct gendisk *disk)
3051 {
3052         struct scsi_disk *sdkp = scsi_disk(disk);
3053         struct scsi_device *sdp = sdkp->device;
3054         struct request_queue *q = sdkp->disk->queue;
3055         sector_t old_capacity = sdkp->capacity;
3056         unsigned char *buffer;
3057         unsigned int dev_max, rw_max;
3058
3059         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3060                                       "sd_revalidate_disk\n"));
3061
3062         /*
3063          * If the device is offline, don't try and read capacity or any
3064          * of the other niceties.
3065          */
3066         if (!scsi_device_online(sdp))
3067                 goto out;
3068
3069         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3070         if (!buffer) {
3071                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3072                           "allocation failure.\n");
3073                 goto out;
3074         }
3075
3076         sd_spinup_disk(sdkp);
3077
3078         /*
3079          * Without media there is no reason to ask; moreover, some devices
3080          * react badly if we do.
3081          */
3082         if (sdkp->media_present) {
3083                 sd_read_capacity(sdkp, buffer);
3084
3085                 if (scsi_device_supports_vpd(sdp)) {
3086                         sd_read_block_provisioning(sdkp);
3087                         sd_read_block_limits(sdkp);
3088                         sd_read_block_characteristics(sdkp);
3089                         sd_zbc_read_zones(sdkp, buffer);
3090                 }
3091
3092                 sd_print_capacity(sdkp, old_capacity);
3093
3094                 sd_read_write_protect_flag(sdkp, buffer);
3095                 sd_read_cache_type(sdkp, buffer);
3096                 sd_read_app_tag_own(sdkp, buffer);
3097                 sd_read_write_same(sdkp, buffer);
3098                 sd_read_security(sdkp, buffer);
3099         }
3100
3101         sdkp->first_scan = 0;
3102
3103         /*
3104          * We now have all cache related info, determine how we deal
3105          * with flush requests.
3106          */
3107         sd_set_flush_flag(sdkp);
3108
3109         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3110         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3111
3112         /* Some devices report a maximum block count for READ/WRITE requests. */
3113         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3114         q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3115
3116         /*
3117          * Use the device's preferred I/O size for reads and writes
3118          * unless the reported value is unreasonably small, large, or
3119          * garbage.
3120          */
3121         if (sdkp->opt_xfer_blocks &&
3122             sdkp->opt_xfer_blocks <= dev_max &&
3123             sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
3124             logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
3125                 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3126                 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3127         } else
3128                 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3129                                       (sector_t)BLK_DEF_MAX_SECTORS);
3130
3131         /* Combine with controller limits */
3132         q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
3133
3134         set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3135         sd_config_write_same(sdkp);
3136         kfree(buffer);
3137
3138  out:
3139         return 0;
3140 }
3141
3142 /**
3143  *      sd_unlock_native_capacity - unlock native capacity
3144  *      @disk: struct gendisk to set capacity for
3145  *
3146  *      Block layer calls this function if it detects that partitions
3147  *      on @disk reach beyond the end of the device.  If the SCSI host
3148  *      implements ->unlock_native_capacity() method, it's invoked to
3149  *      give it a chance to adjust the device capacity.
3150  *
3151  *      CONTEXT:
3152  *      Defined by block layer.  Might sleep.
3153  */
3154 static void sd_unlock_native_capacity(struct gendisk *disk)
3155 {
3156         struct scsi_device *sdev = scsi_disk(disk)->device;
3157
3158         if (sdev->host->hostt->unlock_native_capacity)
3159                 sdev->host->hostt->unlock_native_capacity(sdev);
3160 }
3161
3162 /**
3163  *      sd_format_disk_name - format disk name
3164  *      @prefix: name prefix - ie. "sd" for SCSI disks
3165  *      @index: index of the disk to format name for
3166  *      @buf: output buffer
3167  *      @buflen: length of the output buffer
3168  *
3169  *      SCSI disk names starts at sda.  The 26th device is sdz and the
3170  *      27th is sdaa.  The last one for two lettered suffix is sdzz
3171  *      which is followed by sdaaa.
3172  *
3173  *      This is basically 26 base counting with one extra 'nil' entry
3174  *      at the beginning from the second digit on and can be
3175  *      determined using similar method as 26 base conversion with the
3176  *      index shifted -1 after each digit is computed.
3177  *
3178  *      CONTEXT:
3179  *      Don't care.
3180  *
3181  *      RETURNS:
3182  *      0 on success, -errno on failure.
3183  */
3184 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3185 {
3186         const int base = 'z' - 'a' + 1;
3187         char *begin = buf + strlen(prefix);
3188         char *end = buf + buflen;
3189         char *p;
3190         int unit;
3191
3192         p = end - 1;
3193         *p = '\0';
3194         unit = base;
3195         do {
3196                 if (p == begin)
3197                         return -EINVAL;
3198                 *--p = 'a' + (index % unit);
3199                 index = (index / unit) - 1;
3200         } while (index >= 0);
3201
3202         memmove(begin, p, end - p);
3203         memcpy(buf, prefix, strlen(prefix));
3204
3205         return 0;
3206 }
3207
3208 /*
3209  * The asynchronous part of sd_probe
3210  */
3211 static void sd_probe_async(void *data, async_cookie_t cookie)
3212 {
3213         struct scsi_disk *sdkp = data;
3214         struct scsi_device *sdp;
3215         struct gendisk *gd;
3216         u32 index;
3217         struct device *dev;
3218
3219         sdp = sdkp->device;
3220         gd = sdkp->disk;
3221         index = sdkp->index;
3222         dev = &sdp->sdev_gendev;
3223
3224         gd->major = sd_major((index & 0xf0) >> 4);
3225         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3226         gd->minors = SD_MINORS;
3227
3228         gd->fops = &sd_fops;
3229         gd->private_data = &sdkp->driver;
3230         gd->queue = sdkp->device->request_queue;
3231
3232         /* defaults, until the device tells us otherwise */
3233         sdp->sector_size = 512;
3234         sdkp->capacity = 0;
3235         sdkp->media_present = 1;
3236         sdkp->write_prot = 0;
3237         sdkp->cache_override = 0;
3238         sdkp->WCE = 0;
3239         sdkp->RCD = 0;
3240         sdkp->ATO = 0;
3241         sdkp->first_scan = 1;
3242         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3243
3244         sd_revalidate_disk(gd);
3245
3246         gd->flags = GENHD_FL_EXT_DEVT;
3247         if (sdp->removable) {
3248                 gd->flags |= GENHD_FL_REMOVABLE;
3249                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3250         }
3251
3252         blk_pm_runtime_init(sdp->request_queue, dev);
3253         device_add_disk(dev, gd);
3254         if (sdkp->capacity)
3255                 sd_dif_config_host(sdkp);
3256
3257         sd_revalidate_disk(gd);
3258
3259         if (sdkp->security) {
3260                 sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit);
3261                 if (sdkp->opal_dev)
3262                         sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
3263         }
3264
3265         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3266                   sdp->removable ? "removable " : "");
3267         scsi_autopm_put_device(sdp);
3268         put_device(&sdkp->dev);
3269 }
3270
3271 /**
3272  *      sd_probe - called during driver initialization and whenever a
3273  *      new scsi device is attached to the system. It is called once
3274  *      for each scsi device (not just disks) present.
3275  *      @dev: pointer to device object
3276  *
3277  *      Returns 0 if successful (or not interested in this scsi device
3278  *      (e.g. scanner)); 1 when there is an error.
3279  *
3280  *      Note: this function is invoked from the scsi mid-level.
3281  *      This function sets up the mapping between a given
3282  *      <host,channel,id,lun> (found in sdp) and new device name
3283  *      (e.g. /dev/sda). More precisely it is the block device major
3284  *      and minor number that is chosen here.
3285  *
3286  *      Assume sd_probe is not re-entrant (for time being)
3287  *      Also think about sd_probe() and sd_remove() running coincidentally.
3288  **/
3289 static int sd_probe(struct device *dev)
3290 {
3291         struct scsi_device *sdp = to_scsi_device(dev);
3292         struct scsi_disk *sdkp;
3293         struct gendisk *gd;
3294         int index;
3295         int error;
3296
3297         scsi_autopm_get_device(sdp);
3298         error = -ENODEV;
3299         if (sdp->type != TYPE_DISK &&
3300             sdp->type != TYPE_ZBC &&
3301             sdp->type != TYPE_MOD &&
3302             sdp->type != TYPE_RBC)
3303                 goto out;
3304
3305 #ifndef CONFIG_BLK_DEV_ZONED
3306         if (sdp->type == TYPE_ZBC)
3307                 goto out;
3308 #endif
3309         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3310                                         "sd_probe\n"));
3311
3312         error = -ENOMEM;
3313         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3314         if (!sdkp)
3315                 goto out;
3316
3317         gd = alloc_disk(SD_MINORS);
3318         if (!gd)
3319                 goto out_free;
3320
3321         do {
3322                 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3323                         goto out_put;
3324
3325                 spin_lock(&sd_index_lock);
3326                 error = ida_get_new(&sd_index_ida, &index);
3327                 spin_unlock(&sd_index_lock);
3328         } while (error == -EAGAIN);
3329
3330         if (error) {
3331                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3332                 goto out_put;
3333         }
3334
3335         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3336         if (error) {
3337                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3338                 goto out_free_index;
3339         }
3340
3341         sdkp->device = sdp;
3342         sdkp->driver = &sd_template;
3343         sdkp->disk = gd;
3344         sdkp->index = index;
3345         atomic_set(&sdkp->openers, 0);
3346         atomic_set(&sdkp->device->ioerr_cnt, 0);
3347
3348         if (!sdp->request_queue->rq_timeout) {
3349                 if (sdp->type != TYPE_MOD)
3350                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3351                 else
3352                         blk_queue_rq_timeout(sdp->request_queue,
3353                                              SD_MOD_TIMEOUT);
3354         }
3355
3356         device_initialize(&sdkp->dev);
3357         sdkp->dev.parent = dev;
3358         sdkp->dev.class = &sd_disk_class;
3359         dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3360
3361         error = device_add(&sdkp->dev);
3362         if (error)
3363                 goto out_free_index;
3364
3365         get_device(dev);
3366         dev_set_drvdata(dev, sdkp);
3367
3368         get_device(&sdkp->dev); /* prevent release before async_schedule */
3369         async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3370
3371         return 0;
3372
3373  out_free_index:
3374         spin_lock(&sd_index_lock);
3375         ida_remove(&sd_index_ida, index);
3376         spin_unlock(&sd_index_lock);
3377  out_put:
3378         put_disk(gd);
3379  out_free:
3380         kfree(sdkp);
3381  out:
3382         scsi_autopm_put_device(sdp);
3383         return error;
3384 }
3385
3386 /**
3387  *      sd_remove - called whenever a scsi disk (previously recognized by
3388  *      sd_probe) is detached from the system. It is called (potentially
3389  *      multiple times) during sd module unload.
3390  *      @dev: pointer to device object
3391  *
3392  *      Note: this function is invoked from the scsi mid-level.
3393  *      This function potentially frees up a device name (e.g. /dev/sdc)
3394  *      that could be re-used by a subsequent sd_probe().
3395  *      This function is not called when the built-in sd driver is "exit-ed".
3396  **/
3397 static int sd_remove(struct device *dev)
3398 {
3399         struct scsi_disk *sdkp;
3400         dev_t devt;
3401
3402         sdkp = dev_get_drvdata(dev);
3403         devt = disk_devt(sdkp->disk);
3404         scsi_autopm_get_device(sdkp->device);
3405
3406         async_synchronize_full_domain(&scsi_sd_pm_domain);
3407         async_synchronize_full_domain(&scsi_sd_probe_domain);
3408         device_del(&sdkp->dev);
3409         del_gendisk(sdkp->disk);
3410         sd_shutdown(dev);
3411
3412         sd_zbc_remove(sdkp);
3413
3414         free_opal_dev(sdkp->opal_dev);
3415
3416         blk_register_region(devt, SD_MINORS, NULL,
3417                             sd_default_probe, NULL, NULL);
3418
3419         mutex_lock(&sd_ref_mutex);
3420         dev_set_drvdata(dev, NULL);
3421         put_device(&sdkp->dev);
3422         mutex_unlock(&sd_ref_mutex);
3423
3424         return 0;
3425 }
3426
3427 /**
3428  *      scsi_disk_release - Called to free the scsi_disk structure
3429  *      @dev: pointer to embedded class device
3430  *
3431  *      sd_ref_mutex must be held entering this routine.  Because it is
3432  *      called on last put, you should always use the scsi_disk_get()
3433  *      scsi_disk_put() helpers which manipulate the semaphore directly
3434  *      and never do a direct put_device.
3435  **/
3436 static void scsi_disk_release(struct device *dev)
3437 {
3438         struct scsi_disk *sdkp = to_scsi_disk(dev);
3439         struct gendisk *disk = sdkp->disk;
3440
3441         spin_lock(&sd_index_lock);
3442         ida_remove(&sd_index_ida, sdkp->index);
3443         spin_unlock(&sd_index_lock);
3444
3445         disk->private_data = NULL;
3446         put_disk(disk);
3447         put_device(&sdkp->device->sdev_gendev);
3448
3449         kfree(sdkp);
3450 }
3451
3452 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3453 {
3454         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3455         struct scsi_sense_hdr sshdr;
3456         struct scsi_device *sdp = sdkp->device;
3457         int res;
3458
3459         if (start)
3460                 cmd[4] |= 1;    /* START */
3461
3462         if (sdp->start_stop_pwr_cond)
3463                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3464
3465         if (!scsi_device_online(sdp))
3466                 return -ENODEV;
3467
3468         res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3469                         SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
3470         if (res) {
3471                 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3472                 if (driver_byte(res) & DRIVER_SENSE)
3473                         sd_print_sense_hdr(sdkp, &sshdr);
3474                 if (scsi_sense_valid(&sshdr) &&
3475                         /* 0x3a is medium not present */
3476                         sshdr.asc == 0x3a)
3477                         res = 0;
3478         }
3479
3480         /* SCSI error codes must not go to the generic layer */
3481         if (res)
3482                 return -EIO;
3483
3484         return 0;
3485 }
3486
3487 /*
3488  * Send a SYNCHRONIZE CACHE instruction down to the device through
3489  * the normal SCSI command structure.  Wait for the command to
3490  * complete.
3491  */
3492 static void sd_shutdown(struct device *dev)
3493 {
3494         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3495
3496         if (!sdkp)
3497                 return;         /* this can happen */
3498
3499         if (pm_runtime_suspended(dev))
3500                 return;
3501
3502         if (sdkp->WCE && sdkp->media_present) {
3503                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3504                 sd_sync_cache(sdkp, NULL);
3505         }
3506
3507         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3508                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3509                 sd_start_stop_device(sdkp, 0);
3510         }
3511 }
3512
3513 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3514 {
3515         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3516         struct scsi_sense_hdr sshdr;
3517         int ret = 0;
3518
3519         if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
3520                 return 0;
3521
3522         if (sdkp->WCE && sdkp->media_present) {
3523                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3524                 ret = sd_sync_cache(sdkp, &sshdr);
3525
3526                 if (ret) {
3527                         /* ignore OFFLINE device */
3528                         if (ret == -ENODEV)
3529                                 return 0;
3530
3531                         if (!scsi_sense_valid(&sshdr) ||
3532                             sshdr.sense_key != ILLEGAL_REQUEST)
3533                                 return ret;
3534
3535                         /*
3536                          * sshdr.sense_key == ILLEGAL_REQUEST means this drive
3537                          * doesn't support sync. There's not much to do and
3538                          * suspend shouldn't fail.
3539                          */
3540                          ret = 0;
3541                 }
3542         }
3543
3544         if (sdkp->device->manage_start_stop) {
3545                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3546                 /* an error is not worth aborting a system sleep */
3547                 ret = sd_start_stop_device(sdkp, 0);
3548                 if (ignore_stop_errors)
3549                         ret = 0;
3550         }
3551
3552         return ret;
3553 }
3554
3555 static int sd_suspend_system(struct device *dev)
3556 {
3557         return sd_suspend_common(dev, true);
3558 }
3559
3560 static int sd_suspend_runtime(struct device *dev)
3561 {
3562         return sd_suspend_common(dev, false);
3563 }
3564
3565 static int sd_resume(struct device *dev)
3566 {
3567         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3568         int ret;
3569
3570         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
3571                 return 0;
3572
3573         if (!sdkp->device->manage_start_stop)
3574                 return 0;
3575
3576         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3577         ret = sd_start_stop_device(sdkp, 1);
3578         if (!ret)
3579                 opal_unlock_from_suspend(sdkp->opal_dev);
3580         return ret;
3581 }
3582
3583 /**
3584  *      init_sd - entry point for this driver (both when built in or when
3585  *      a module).
3586  *
3587  *      Note: this function registers this driver with the scsi mid-level.
3588  **/
3589 static int __init init_sd(void)
3590 {
3591         int majors = 0, i, err;
3592
3593         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3594
3595         for (i = 0; i < SD_MAJORS; i++) {
3596                 if (register_blkdev(sd_major(i), "sd") != 0)
3597                         continue;
3598                 majors++;
3599                 blk_register_region(sd_major(i), SD_MINORS, NULL,
3600                                     sd_default_probe, NULL, NULL);
3601         }
3602
3603         if (!majors)
3604                 return -ENODEV;
3605
3606         err = class_register(&sd_disk_class);
3607         if (err)
3608                 goto err_out;
3609
3610         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3611                                          0, 0, NULL);
3612         if (!sd_cdb_cache) {
3613                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3614                 err = -ENOMEM;
3615                 goto err_out_class;
3616         }
3617
3618         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3619         if (!sd_cdb_pool) {
3620                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3621                 err = -ENOMEM;
3622                 goto err_out_cache;
3623         }
3624
3625         err = scsi_register_driver(&sd_template.gendrv);
3626         if (err)
3627                 goto err_out_driver;
3628
3629         return 0;
3630
3631 err_out_driver:
3632         mempool_destroy(sd_cdb_pool);
3633
3634 err_out_cache:
3635         kmem_cache_destroy(sd_cdb_cache);
3636
3637 err_out_class:
3638         class_unregister(&sd_disk_class);
3639 err_out:
3640         for (i = 0; i < SD_MAJORS; i++)
3641                 unregister_blkdev(sd_major(i), "sd");
3642         return err;
3643 }
3644
3645 /**
3646  *      exit_sd - exit point for this driver (when it is a module).
3647  *
3648  *      Note: this function unregisters this driver from the scsi mid-level.
3649  **/
3650 static void __exit exit_sd(void)
3651 {
3652         int i;
3653
3654         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3655
3656         scsi_unregister_driver(&sd_template.gendrv);
3657         mempool_destroy(sd_cdb_pool);
3658         kmem_cache_destroy(sd_cdb_cache);
3659
3660         class_unregister(&sd_disk_class);
3661
3662         for (i = 0; i < SD_MAJORS; i++) {
3663                 blk_unregister_region(sd_major(i), SD_MINORS);
3664                 unregister_blkdev(sd_major(i), "sd");
3665         }
3666 }
3667
3668 module_init(init_sd);
3669 module_exit(exit_sd);
3670
3671 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3672                                struct scsi_sense_hdr *sshdr)
3673 {
3674         scsi_print_sense_hdr(sdkp->device,
3675                              sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3676 }
3677
3678 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3679                             int result)
3680 {
3681         const char *hb_string = scsi_hostbyte_string(result);
3682         const char *db_string = scsi_driverbyte_string(result);
3683
3684         if (hb_string || db_string)
3685                 sd_printk(KERN_INFO, sdkp,
3686                           "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3687                           hb_string ? hb_string : "invalid",
3688                           db_string ? db_string : "invalid");
3689         else
3690                 sd_printk(KERN_INFO, sdkp,
3691                           "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3692                           msg, host_byte(result), driver_byte(result));
3693 }
3694