drivers/scsi/sd.c

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