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 <asm/uaccess.h>
  56 #include <asm/unaligned.h>
  57
  58 #include <scsi/scsi.h>
  59 #include <scsi/scsi_cmnd.h>
  60 #include <scsi/scsi_dbg.h>
  61 #include <scsi/scsi_device.h>
  62 #include <scsi/scsi_driver.h>
  63 #include <scsi/scsi_eh.h>
  64 #include <scsi/scsi_host.h>
  65 #include <scsi/scsi_ioctl.h>
  66 #include <scsi/scsicam.h>
  67
  68 #include "sd.h"
  69 #include "scsi_priv.h"
  70 #include "scsi_logging.h"
  71
  72 MODULE_AUTHOR("Eric Youngdale");
  73 MODULE_DESCRIPTION("SCSI disk (sd) driver");
  74 MODULE_LICENSE("GPL");
  75
  76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  92 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  93 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  94 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  95
  96 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
  97 #define SD_MINORS       16
  98 #else
  99 #define SD_MINORS       0
 100 #endif
 101
 102 static void sd_config_discard(struct scsi_disk *, unsigned int);
 103 static void sd_config_write_same(struct scsi_disk *);
 104 static int  sd_revalidate_disk(struct gendisk *);
 105 static void sd_unlock_native_capacity(struct gendisk *disk);
 106 static int  sd_probe(struct device *);
 107 static int  sd_remove(struct device *);
 108 static void sd_shutdown(struct device *);
 109 static int sd_suspend_system(struct device *);
 110 static int sd_suspend_runtime(struct device *);
 111 static int sd_resume(struct device *);
 112 static void sd_rescan(struct device *);
 113 static int sd_init_command(struct scsi_cmnd *SCpnt);
 114 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 115 static int sd_done(struct scsi_cmnd *);
 116 static int sd_eh_action(struct scsi_cmnd *, int);
 117 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 118 static void scsi_disk_release(struct device *cdev);
 119 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 120 static void sd_print_result(const struct scsi_disk *, const char *, int);
 121
 122 static DEFINE_SPINLOCK(sd_index_lock);
 123 static DEFINE_IDA(sd_index_ida);
 124
 125 /* This semaphore is used to mediate the 0->1 reference get in the
 126  * face of object destruction (i.e. we can't allow a get on an
 127  * object after last put) */
 128 static DEFINE_MUTEX(sd_ref_mutex);
 129
 130 static struct kmem_cache *sd_cdb_cache;
 131 static mempool_t *sd_cdb_pool;
 132
 133 static const char *sd_cache_types[] = {
 134         "write through", "none", "write back",
 135         "write back, no read (daft)"
 136 };
 137
 138 static void sd_set_flush_flag(struct scsi_disk *sdkp)
 139 {
 140         unsigned flush = 0;
 141
 142         if (sdkp->WCE) {
 143                 flush |= REQ_FLUSH;
 144                 if (sdkp->DPOFUA)
 145                         flush |= REQ_FUA;
 146         }
 147
 148         blk_queue_flush(sdkp->disk->queue, flush);
 149 }
 150
 151 static ssize_t
 152 cache_type_store(struct device *dev, struct device_attribute *attr,
 153                  const char *buf, size_t count)
 154 {
 155         int i, ct = -1, rcd, wce, sp;
 156         struct scsi_disk *sdkp = to_scsi_disk(dev);
 157         struct scsi_device *sdp = sdkp->device;
 158         char buffer[64];
 159         char *buffer_data;
 160         struct scsi_mode_data data;
 161         struct scsi_sense_hdr sshdr;
 162         static const char temp[] = "temporary ";
 163         int len;
 164
 165         if (sdp->type != TYPE_DISK)
 166                 /* no cache control on RBC devices; theoretically they
 167                  * can do it, but there's probably so many exceptions
 168                  * it's not worth the risk */
 169                 return -EINVAL;
 170
 171         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 172                 buf += sizeof(temp) - 1;
 173                 sdkp->cache_override = 1;
 174         } else {
 175                 sdkp->cache_override = 0;
 176         }
 177
 178         for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
 179                 len = strlen(sd_cache_types[i]);
 180                 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
 181                     buf[len] == '\n') {
 182                         ct = i;
 183                         break;
 184                 }
 185         }
 186         if (ct < 0)
 187                 return -EINVAL;
 188         rcd = ct & 0x01 ? 1 : 0;
 189         wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 190
 191         if (sdkp->cache_override) {
 192                 sdkp->WCE = wce;
 193                 sdkp->RCD = rcd;
 194                 sd_set_flush_flag(sdkp);
 195                 return count;
 196         }
 197
 198         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 199                             SD_MAX_RETRIES, &data, NULL))
 200                 return -EINVAL;
 201         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 202                   data.block_descriptor_length);
 203         buffer_data = buffer + data.header_length +
 204                 data.block_descriptor_length;
 205         buffer_data[2] &= ~0x05;
 206         buffer_data[2] |= wce << 2 | rcd;
 207         sp = buffer_data[0] & 0x80 ? 1 : 0;
 208         buffer_data[0] &= ~0x80;
 209
 210         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 211                              SD_MAX_RETRIES, &data, &sshdr)) {
 212                 if (scsi_sense_valid(&sshdr))
 213                         sd_print_sense_hdr(sdkp, &sshdr);
 214                 return -EINVAL;
 215         }
 216         revalidate_disk(sdkp->disk);
 217         return count;
 218 }
 219
 220 static ssize_t
 221 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
 222                        char *buf)
 223 {
 224         struct scsi_disk *sdkp = to_scsi_disk(dev);
 225         struct scsi_device *sdp = sdkp->device;
 226
 227         return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
 228 }
 229
 230 static ssize_t
 231 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
 232                         const char *buf, size_t count)
 233 {
 234         struct scsi_disk *sdkp = to_scsi_disk(dev);
 235         struct scsi_device *sdp = sdkp->device;
 236
 237         if (!capable(CAP_SYS_ADMIN))
 238                 return -EACCES;
 239
 240         sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
 241
 242         return count;
 243 }
 244 static DEVICE_ATTR_RW(manage_start_stop);
 245
 246 static ssize_t
 247 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 248 {
 249         struct scsi_disk *sdkp = to_scsi_disk(dev);
 250
 251         return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
 252 }
 253
 254 static ssize_t
 255 allow_restart_store(struct device *dev, struct device_attribute *attr,
 256                     const char *buf, size_t count)
 257 {
 258         struct scsi_disk *sdkp = to_scsi_disk(dev);
 259         struct scsi_device *sdp = sdkp->device;
 260
 261         if (!capable(CAP_SYS_ADMIN))
 262                 return -EACCES;
 263
 264         if (sdp->type != TYPE_DISK)
 265                 return -EINVAL;
 266
 267         sdp->allow_restart = simple_strtoul(buf, NULL, 10);
 268
 269         return count;
 270 }
 271 static DEVICE_ATTR_RW(allow_restart);
 272
 273 static ssize_t
 274 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 275 {
 276         struct scsi_disk *sdkp = to_scsi_disk(dev);
 277         int ct = sdkp->RCD + 2*sdkp->WCE;
 278
 279         return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
 280 }
 281 static DEVICE_ATTR_RW(cache_type);
 282
 283 static ssize_t
 284 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 285 {
 286         struct scsi_disk *sdkp = to_scsi_disk(dev);
 287
 288         return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
 289 }
 290 static DEVICE_ATTR_RO(FUA);
 291
 292 static ssize_t
 293 protection_type_show(struct device *dev, struct device_attribute *attr,
 294                      char *buf)
 295 {
 296         struct scsi_disk *sdkp = to_scsi_disk(dev);
 297
 298         return snprintf(buf, 20, "%u\n", sdkp->protection_type);
 299 }
 300
 301 static ssize_t
 302 protection_type_store(struct device *dev, struct device_attribute *attr,
 303                       const char *buf, size_t count)
 304 {
 305         struct scsi_disk *sdkp = to_scsi_disk(dev);
 306         unsigned int val;
 307         int err;
 308
 309         if (!capable(CAP_SYS_ADMIN))
 310                 return -EACCES;
 311
 312         err = kstrtouint(buf, 10, &val);
 313
 314         if (err)
 315                 return err;
 316
 317         if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
 318                 sdkp->protection_type = val;
 319
 320         return count;
 321 }
 322 static DEVICE_ATTR_RW(protection_type);
 323
 324 static ssize_t
 325 protection_mode_show(struct device *dev, struct device_attribute *attr,
 326                      char *buf)
 327 {
 328         struct scsi_disk *sdkp = to_scsi_disk(dev);
 329         struct scsi_device *sdp = sdkp->device;
 330         unsigned int dif, dix;
 331
 332         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 333         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 334
 335         if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
 336                 dif = 0;
 337                 dix = 1;
 338         }
 339
 340         if (!dif && !dix)
 341                 return snprintf(buf, 20, "none\n");
 342
 343         return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
 344 }
 345 static DEVICE_ATTR_RO(protection_mode);
 346
 347 static ssize_t
 348 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 349 {
 350         struct scsi_disk *sdkp = to_scsi_disk(dev);
 351
 352         return snprintf(buf, 20, "%u\n", sdkp->ATO);
 353 }
 354 static DEVICE_ATTR_RO(app_tag_own);
 355
 356 static ssize_t
 357 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
 358                        char *buf)
 359 {
 360         struct scsi_disk *sdkp = to_scsi_disk(dev);
 361
 362         return snprintf(buf, 20, "%u\n", sdkp->lbpme);
 363 }
 364 static DEVICE_ATTR_RO(thin_provisioning);
 365
 366 static const char *lbp_mode[] = {
 367         [SD_LBP_FULL]           = "full",
 368         [SD_LBP_UNMAP]          = "unmap",
 369         [SD_LBP_WS16]           = "writesame_16",
 370         [SD_LBP_WS10]           = "writesame_10",
 371         [SD_LBP_ZERO]           = "writesame_zero",
 372         [SD_LBP_DISABLE]        = "disabled",
 373 };
 374
 375 static ssize_t
 376 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
 377                        char *buf)
 378 {
 379         struct scsi_disk *sdkp = to_scsi_disk(dev);
 380
 381         return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 382 }
 383
 384 static ssize_t
 385 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
 386                         const char *buf, size_t count)
 387 {
 388         struct scsi_disk *sdkp = to_scsi_disk(dev);
 389         struct scsi_device *sdp = sdkp->device;
 390
 391         if (!capable(CAP_SYS_ADMIN))
 392                 return -EACCES;
 393
 394         if (sdp->type != TYPE_DISK)
 395                 return -EINVAL;
 396
 397         if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
 398                 sd_config_discard(sdkp, SD_LBP_UNMAP);
 399         else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
 400                 sd_config_discard(sdkp, SD_LBP_WS16);
 401         else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
 402                 sd_config_discard(sdkp, SD_LBP_WS10);
 403         else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
 404                 sd_config_discard(sdkp, SD_LBP_ZERO);
 405         else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
 406                 sd_config_discard(sdkp, SD_LBP_DISABLE);
 407         else
 408                 return -EINVAL;
 409
 410         return count;
 411 }
 412 static DEVICE_ATTR_RW(provisioning_mode);
 413
 414 static ssize_t
 415 max_medium_access_timeouts_show(struct device *dev,
 416                                 struct device_attribute *attr, char *buf)
 417 {
 418         struct scsi_disk *sdkp = to_scsi_disk(dev);
 419
 420         return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
 421 }
 422
 423 static ssize_t
 424 max_medium_access_timeouts_store(struct device *dev,
 425                                  struct device_attribute *attr, const char *buf,
 426                                  size_t count)
 427 {
 428         struct scsi_disk *sdkp = to_scsi_disk(dev);
 429         int err;
 430
 431         if (!capable(CAP_SYS_ADMIN))
 432                 return -EACCES;
 433
 434         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 435
 436         return err ? err : count;
 437 }
 438 static DEVICE_ATTR_RW(max_medium_access_timeouts);
 439
 440 static ssize_t
 441 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
 442                            char *buf)
 443 {
 444         struct scsi_disk *sdkp = to_scsi_disk(dev);
 445
 446         return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
 447 }
 448
 449 static ssize_t
 450 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
 451                             const char *buf, size_t count)
 452 {
 453         struct scsi_disk *sdkp = to_scsi_disk(dev);
 454         struct scsi_device *sdp = sdkp->device;
 455         unsigned long max;
 456         int err;
 457
 458         if (!capable(CAP_SYS_ADMIN))
 459                 return -EACCES;
 460
 461         if (sdp->type != TYPE_DISK)
 462                 return -EINVAL;
 463
 464         err = kstrtoul(buf, 10, &max);
 465
 466         if (err)
 467                 return err;
 468
 469         if (max == 0)
 470                 sdp->no_write_same = 1;
 471         else if (max <= SD_MAX_WS16_BLOCKS) {
 472                 sdp->no_write_same = 0;
 473                 sdkp->max_ws_blocks = max;
 474         }
 475
 476         sd_config_write_same(sdkp);
 477
 478         return count;
 479 }
 480 static DEVICE_ATTR_RW(max_write_same_blocks);
 481
 482 static struct attribute *sd_disk_attrs[] = {
 483         &dev_attr_cache_type.attr,
 484         &dev_attr_FUA.attr,
 485         &dev_attr_allow_restart.attr,
 486         &dev_attr_manage_start_stop.attr,
 487         &dev_attr_protection_type.attr,
 488         &dev_attr_protection_mode.attr,
 489         &dev_attr_app_tag_own.attr,
 490         &dev_attr_thin_provisioning.attr,
 491         &dev_attr_provisioning_mode.attr,
 492         &dev_attr_max_write_same_blocks.attr,
 493         &dev_attr_max_medium_access_timeouts.attr,
 494         NULL,
 495 };
 496 ATTRIBUTE_GROUPS(sd_disk);
 497
 498 static struct class sd_disk_class = {
 499         .name           = "scsi_disk",
 500         .owner          = THIS_MODULE,
 501         .dev_release    = scsi_disk_release,
 502         .dev_groups     = sd_disk_groups,
 503 };
 504
 505 static const struct dev_pm_ops sd_pm_ops = {
 506         .suspend                = sd_suspend_system,
 507         .resume                 = sd_resume,
 508         .poweroff               = sd_suspend_system,
 509         .restore                = sd_resume,
 510         .runtime_suspend        = sd_suspend_runtime,
 511         .runtime_resume         = sd_resume,
 512 };
 513
 514 static struct scsi_driver sd_template = {
 515         .gendrv = {
 516                 .name           = "sd",
 517                 .owner          = THIS_MODULE,
 518                 .probe          = sd_probe,
 519                 .remove         = sd_remove,
 520                 .shutdown       = sd_shutdown,
 521                 .pm             = &sd_pm_ops,
 522         },
 523         .rescan                 = sd_rescan,
 524         .init_command           = sd_init_command,
 525         .uninit_command         = sd_uninit_command,
 526         .done                   = sd_done,
 527         .eh_action              = sd_eh_action,
 528 };
 529
 530 /*
 531  * Dummy kobj_map->probe function.
 532  * The default ->probe function will call modprobe, which is
 533  * pointless as this module is already loaded.
 534  */
 535 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
 536 {
 537         return NULL;
 538 }
 539
 540 /*
 541  * Device no to disk mapping:
 542  *
 543  *       major         disc2     disc  p1
 544  *   |............|.............|....|....| <- dev_t
 545  *    31        20 19          8 7  4 3  0
 546  *
 547  * Inside a major, we have 16k disks, however mapped non-
 548  * contiguously. The first 16 disks are for major0, the next
 549  * ones with major1, ... Disk 256 is for major0 again, disk 272
 550  * for major1, ...
 551  * As we stay compatible with our numbering scheme, we can reuse
 552  * the well-know SCSI majors 8, 65--71, 136--143.
 553  */
 554 static int sd_major(int major_idx)
 555 {
 556         switch (major_idx) {
 557         case 0:
 558                 return SCSI_DISK0_MAJOR;
 559         case 1 ... 7:
 560                 return SCSI_DISK1_MAJOR + major_idx - 1;
 561         case 8 ... 15:
 562                 return SCSI_DISK8_MAJOR + major_idx - 8;
 563         default:
 564                 BUG();
 565                 return 0;       /* shut up gcc */
 566         }
 567 }
 568
 569 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 570 {
 571         struct scsi_disk *sdkp = NULL;
 572
 573         mutex_lock(&sd_ref_mutex);
 574
 575         if (disk->private_data) {
 576                 sdkp = scsi_disk(disk);
 577                 if (scsi_device_get(sdkp->device) == 0)
 578                         get_device(&sdkp->dev);
 579                 else
 580                         sdkp = NULL;
 581         }
 582         mutex_unlock(&sd_ref_mutex);
 583         return sdkp;
 584 }
 585
 586 static void scsi_disk_put(struct scsi_disk *sdkp)
 587 {
 588         struct scsi_device *sdev = sdkp->device;
 589
 590         mutex_lock(&sd_ref_mutex);
 591         put_device(&sdkp->dev);
 592         scsi_device_put(sdev);
 593         mutex_unlock(&sd_ref_mutex);
 594 }
 595
 596 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
 597                                            unsigned int dix, unsigned int dif)
 598 {
 599         struct bio *bio = scmd->request->bio;
 600         unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
 601         unsigned int protect = 0;
 602
 603         if (dix) {                              /* DIX Type 0, 1, 2, 3 */
 604                 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
 605                         scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
 606
 607                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 608                         scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
 609         }
 610
 611         if (dif != SD_DIF_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
 612                 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
 613
 614                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 615                         scmd->prot_flags |= SCSI_PROT_REF_CHECK;
 616         }
 617
 618         if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
 619                 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
 620
 621                 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
 622                         protect = 3 << 5;       /* Disable target PI checking */
 623                 else
 624                         protect = 1 << 5;       /* Enable target PI checking */
 625         }
 626
 627         scsi_set_prot_op(scmd, prot_op);
 628         scsi_set_prot_type(scmd, dif);
 629         scmd->prot_flags &= sd_prot_flag_mask(prot_op);
 630
 631         return protect;
 632 }
 633
 634 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 635 {
 636         struct request_queue *q = sdkp->disk->queue;
 637         unsigned int logical_block_size = sdkp->device->sector_size;
 638         unsigned int max_blocks = 0;
 639
 640         q->limits.discard_zeroes_data = 0;
 641
 642         /*
 643          * When LBPRZ is reported, discard alignment and granularity
 644          * must be fixed to the logical block size. Otherwise the block
 645          * layer will drop misaligned portions of the request which can
 646          * lead to data corruption. If LBPRZ is not set, we honor the
 647          * device preference.
 648          */
 649         if (sdkp->lbprz) {
 650                 q->limits.discard_alignment = 0;
 651                 q->limits.discard_granularity = logical_block_size;
 652         } else {
 653                 q->limits.discard_alignment = sdkp->unmap_alignment *
 654                         logical_block_size;
 655                 q->limits.discard_granularity =
 656                         max(sdkp->physical_block_size,
 657                             sdkp->unmap_granularity * logical_block_size);
 658         }
 659
 660         sdkp->provisioning_mode = mode;
 661
 662         switch (mode) {
 663
 664         case SD_LBP_DISABLE:
 665                 blk_queue_max_discard_sectors(q, 0);
 666                 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
 667                 return;
 668
 669         case SD_LBP_UNMAP:
 670                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 671                                           (u32)SD_MAX_WS16_BLOCKS);
 672                 break;
 673
 674         case SD_LBP_WS16:
 675                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 676                                           (u32)SD_MAX_WS16_BLOCKS);
 677                 q->limits.discard_zeroes_data = sdkp->lbprz;
 678                 break;
 679
 680         case SD_LBP_WS10:
 681                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 682                                           (u32)SD_MAX_WS10_BLOCKS);
 683                 q->limits.discard_zeroes_data = sdkp->lbprz;
 684                 break;
 685
 686         case SD_LBP_ZERO:
 687                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 688                                           (u32)SD_MAX_WS10_BLOCKS);
 689                 q->limits.discard_zeroes_data = 1;
 690                 break;
 691         }
 692
 693         blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
 694         queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
 695 }
 696
 697 /**
 698  * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
 699  * @sdp: scsi device to operate one
 700  * @rq: Request to prepare
 701  *
 702  * Will issue either UNMAP or WRITE SAME(16) depending on preference
 703  * indicated by target device.
 704  **/
 705 static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
 706 {
 707         struct request *rq = cmd->request;
 708         struct scsi_device *sdp = cmd->device;
 709         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 710         sector_t sector = blk_rq_pos(rq);
 711         unsigned int nr_sectors = blk_rq_sectors(rq);
 712         unsigned int nr_bytes = blk_rq_bytes(rq);
 713         unsigned int len;
 714         int ret;
 715         char *buf;
 716         struct page *page;
 717
 718         sector >>= ilog2(sdp->sector_size) - 9;
 719         nr_sectors >>= ilog2(sdp->sector_size) - 9;
 720
 721         page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 722         if (!page)
 723                 return BLKPREP_DEFER;
 724
 725         switch (sdkp->provisioning_mode) {
 726         case SD_LBP_UNMAP:
 727                 buf = page_address(page);
 728
 729                 cmd->cmd_len = 10;
 730                 cmd->cmnd[0] = UNMAP;
 731                 cmd->cmnd[8] = 24;
 732
 733                 put_unaligned_be16(6 + 16, &buf[0]);
 734                 put_unaligned_be16(16, &buf[2]);
 735                 put_unaligned_be64(sector, &buf[8]);
 736                 put_unaligned_be32(nr_sectors, &buf[16]);
 737
 738                 len = 24;
 739                 break;
 740
 741         case SD_LBP_WS16:
 742                 cmd->cmd_len = 16;
 743                 cmd->cmnd[0] = WRITE_SAME_16;
 744                 cmd->cmnd[1] = 0x8; /* UNMAP */
 745                 put_unaligned_be64(sector, &cmd->cmnd[2]);
 746                 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
 747
 748                 len = sdkp->device->sector_size;
 749                 break;
 750
 751         case SD_LBP_WS10:
 752         case SD_LBP_ZERO:
 753                 cmd->cmd_len = 10;
 754                 cmd->cmnd[0] = WRITE_SAME;
 755                 if (sdkp->provisioning_mode == SD_LBP_WS10)
 756                         cmd->cmnd[1] = 0x8; /* UNMAP */
 757                 put_unaligned_be32(sector, &cmd->cmnd[2]);
 758                 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
 759
 760                 len = sdkp->device->sector_size;
 761                 break;
 762
 763         default:
 764                 ret = BLKPREP_INVALID;
 765                 goto out;
 766         }
 767
 768         rq->completion_data = page;
 769         rq->timeout = SD_TIMEOUT;
 770
 771         cmd->transfersize = len;
 772         cmd->allowed = SD_MAX_RETRIES;
 773
 774         /*
 775          * Initially __data_len is set to the amount of data that needs to be
 776          * transferred to the target. This amount depends on whether WRITE SAME
 777          * or UNMAP is being used. After the scatterlist has been mapped by
 778          * scsi_init_io() we set __data_len to the size of the area to be
 779          * discarded on disk. This allows us to report completion on the full
 780          * amount of blocks described by the request.
 781          */
 782         blk_add_request_payload(rq, page, len);
 783         ret = scsi_init_io(cmd);
 784         rq->__data_len = nr_bytes;
 785
 786 out:
 787         if (ret != BLKPREP_OK)
 788                 __free_page(page);
 789         return ret;
 790 }
 791
 792 static void sd_config_write_same(struct scsi_disk *sdkp)
 793 {
 794         struct request_queue *q = sdkp->disk->queue;
 795         unsigned int logical_block_size = sdkp->device->sector_size;
 796
 797         if (sdkp->device->no_write_same) {
 798                 sdkp->max_ws_blocks = 0;
 799                 goto out;
 800         }
 801
 802         /* Some devices can not handle block counts above 0xffff despite
 803          * supporting WRITE SAME(16). Consequently we default to 64k
 804          * blocks per I/O unless the device explicitly advertises a
 805          * bigger limit.
 806          */
 807         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 808                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 809                                                    (u32)SD_MAX_WS16_BLOCKS);
 810         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 811                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 812                                                    (u32)SD_MAX_WS10_BLOCKS);
 813         else {
 814                 sdkp->device->no_write_same = 1;
 815                 sdkp->max_ws_blocks = 0;
 816         }
 817
 818 out:
 819         blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
 820                                          (logical_block_size >> 9));
 821 }
 822
 823 /**
 824  * sd_setup_write_same_cmnd - write the same data to multiple blocks
 825  * @cmd: command to prepare
 826  *
 827  * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
 828  * preference indicated by target device.
 829  **/
 830 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
 831 {
 832         struct request *rq = cmd->request;
 833         struct scsi_device *sdp = cmd->device;
 834         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 835         struct bio *bio = rq->bio;
 836         sector_t sector = blk_rq_pos(rq);
 837         unsigned int nr_sectors = blk_rq_sectors(rq);
 838         unsigned int nr_bytes = blk_rq_bytes(rq);
 839         int ret;
 840
 841         if (sdkp->device->no_write_same)
 842                 return BLKPREP_INVALID;
 843
 844         BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
 845
 846         sector >>= ilog2(sdp->sector_size) - 9;
 847         nr_sectors >>= ilog2(sdp->sector_size) - 9;
 848
 849         rq->timeout = SD_WRITE_SAME_TIMEOUT;
 850
 851         if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
 852                 cmd->cmd_len = 16;
 853                 cmd->cmnd[0] = WRITE_SAME_16;
 854                 put_unaligned_be64(sector, &cmd->cmnd[2]);
 855                 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
 856         } else {
 857                 cmd->cmd_len = 10;
 858                 cmd->cmnd[0] = WRITE_SAME;
 859                 put_unaligned_be32(sector, &cmd->cmnd[2]);
 860                 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
 861         }
 862
 863         cmd->transfersize = sdp->sector_size;
 864         cmd->allowed = SD_MAX_RETRIES;
 865
 866         /*
 867          * For WRITE_SAME the data transferred in the DATA IN buffer is
 868          * different from the amount of data actually written to the target.
 869          *
 870          * We set up __data_len to the amount of data transferred from the
 871          * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list
 872          * to transfer a single sector of data first, but then reset it to
 873          * the amount of data to be written right after so that the I/O path
 874          * knows how much to actually write.
 875          */
 876         rq->__data_len = sdp->sector_size;
 877         ret = scsi_init_io(cmd);
 878         rq->__data_len = nr_bytes;
 879         return ret;
 880 }
 881
 882 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
 883 {
 884         struct request *rq = cmd->request;
 885
 886         /* flush requests don't perform I/O, zero the S/G table */
 887         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
 888
 889         cmd->cmnd[0] = SYNCHRONIZE_CACHE;
 890         cmd->cmd_len = 10;
 891         cmd->transfersize = 0;
 892         cmd->allowed = SD_MAX_RETRIES;
 893
 894         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
 895         return BLKPREP_OK;
 896 }
 897
 898 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
 899 {
 900         struct request *rq = SCpnt->request;
 901         struct scsi_device *sdp = SCpnt->device;
 902         struct gendisk *disk = rq->rq_disk;
 903         struct scsi_disk *sdkp;
 904         sector_t block = blk_rq_pos(rq);
 905         sector_t threshold;
 906         unsigned int this_count = blk_rq_sectors(rq);
 907         unsigned int dif, dix;
 908         int ret;
 909         unsigned char protect;
 910
 911         ret = scsi_init_io(SCpnt);
 912         if (ret != BLKPREP_OK)
 913                 goto out;
 914         SCpnt = rq->special;
 915         sdkp = scsi_disk(disk);
 916
 917         /* from here on until we're complete, any goto out
 918          * is used for a killable error condition */
 919         ret = BLKPREP_KILL;
 920
 921         SCSI_LOG_HLQUEUE(1,
 922                 scmd_printk(KERN_INFO, SCpnt,
 923                         "%s: block=%llu, count=%d\n",
 924                         __func__, (unsigned long long)block, this_count));
 925
 926         if (!sdp || !scsi_device_online(sdp) ||
 927             block + blk_rq_sectors(rq) > get_capacity(disk)) {
 928                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
 929                                                 "Finishing %u sectors\n",
 930                                                 blk_rq_sectors(rq)));
 931                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
 932                                                 "Retry with 0x%p\n", SCpnt));
 933                 goto out;
 934         }
 935
 936         if (sdp->changed) {
 937                 /*
 938                  * quietly refuse to do anything to a changed disc until
 939                  * the changed bit has been reset
 940                  */
 941                 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
 942                 goto out;
 943         }
 944
 945         /*
 946          * Some SD card readers can't handle multi-sector accesses which touch
 947          * the last one or two hardware sectors.  Split accesses as needed.
 948          */
 949         threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
 950                 (sdp->sector_size / 512);
 951
 952         if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
 953                 if (block < threshold) {
 954                         /* Access up to the threshold but not beyond */
 955                         this_count = threshold - block;
 956                 } else {
 957                         /* Access only a single hardware sector */
 958                         this_count = sdp->sector_size / 512;
 959                 }
 960         }
 961
 962         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
 963                                         (unsigned long long)block));
 964
 965         /*
 966          * If we have a 1K hardware sectorsize, prevent access to single
 967          * 512 byte sectors.  In theory we could handle this - in fact
 968          * the scsi cdrom driver must be able to handle this because
 969          * we typically use 1K blocksizes, and cdroms typically have
 970          * 2K hardware sectorsizes.  Of course, things are simpler
 971          * with the cdrom, since it is read-only.  For performance
 972          * reasons, the filesystems should be able to handle this
 973          * and not force the scsi disk driver to use bounce buffers
 974          * for this.
 975          */
 976         if (sdp->sector_size == 1024) {
 977                 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
 978                         scmd_printk(KERN_ERR, SCpnt,
 979                                     "Bad block number requested\n");
 980                         goto out;
 981                 } else {
 982                         block = block >> 1;
 983                         this_count = this_count >> 1;
 984                 }
 985         }
 986         if (sdp->sector_size == 2048) {
 987                 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
 988                         scmd_printk(KERN_ERR, SCpnt,
 989                                     "Bad block number requested\n");
 990                         goto out;
 991                 } else {
 992                         block = block >> 2;
 993                         this_count = this_count >> 2;
 994                 }
 995         }
 996         if (sdp->sector_size == 4096) {
 997                 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
 998                         scmd_printk(KERN_ERR, SCpnt,
 999                                     "Bad block number requested\n");
1000                         goto out;
1001                 } else {
1002                         block = block >> 3;
1003                         this_count = this_count >> 3;
1004                 }
1005         }
1006         if (rq_data_dir(rq) == WRITE) {
1007                 SCpnt->cmnd[0] = WRITE_6;
1008
1009                 if (blk_integrity_rq(rq))
1010                         sd_dif_prepare(SCpnt);
1011
1012         } else if (rq_data_dir(rq) == READ) {
1013                 SCpnt->cmnd[0] = READ_6;
1014         } else {
1015                 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags);
1016                 goto out;
1017         }
1018
1019         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1020                                         "%s %d/%u 512 byte blocks.\n",
1021                                         (rq_data_dir(rq) == WRITE) ?
1022                                         "writing" : "reading", this_count,
1023                                         blk_rq_sectors(rq)));
1024
1025         dix = scsi_prot_sg_count(SCpnt);
1026         dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1027
1028         if (dif || dix)
1029                 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1030         else
1031                 protect = 0;
1032
1033         if (protect && sdkp->protection_type == SD_DIF_TYPE2_PROTECTION) {
1034                 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1035
1036                 if (unlikely(SCpnt->cmnd == NULL)) {
1037                         ret = BLKPREP_DEFER;
1038                         goto out;
1039                 }
1040
1041                 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1042                 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1043                 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1044                 SCpnt->cmnd[7] = 0x18;
1045                 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1046                 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1047
1048                 /* LBA */
1049                 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1050                 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1051                 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1052                 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1053                 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1054                 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1055                 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1056                 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1057
1058                 /* Expected Indirect LBA */
1059                 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1060                 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1061                 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1062                 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1063
1064                 /* Transfer length */
1065                 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1066                 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1067                 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1068                 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1069         } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1070                 SCpnt->cmnd[0] += READ_16 - READ_6;
1071                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1072                 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1073                 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1074                 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1075                 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1076                 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1077                 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1078                 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1079                 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1080                 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1081                 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1082                 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1083                 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1084                 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1085         } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1086                    scsi_device_protection(SCpnt->device) ||
1087                    SCpnt->device->use_10_for_rw) {
1088                 SCpnt->cmnd[0] += READ_10 - READ_6;
1089                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1090                 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1091                 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1092                 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1093                 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1094                 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1095                 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1096                 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1097         } else {
1098                 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1099                         /*
1100                          * This happens only if this drive failed
1101                          * 10byte rw command with ILLEGAL_REQUEST
1102                          * during operation and thus turned off
1103                          * use_10_for_rw.
1104                          */
1105                         scmd_printk(KERN_ERR, SCpnt,
1106                                     "FUA write on READ/WRITE(6) drive\n");
1107                         goto out;
1108                 }
1109
1110                 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1111                 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1112                 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1113                 SCpnt->cmnd[4] = (unsigned char) this_count;
1114                 SCpnt->cmnd[5] = 0;
1115         }
1116         SCpnt->sdb.length = this_count * sdp->sector_size;
1117
1118         /*
1119          * We shouldn't disconnect in the middle of a sector, so with a dumb
1120          * host adapter, it's safe to assume that we can at least transfer
1121          * this many bytes between each connect / disconnect.
1122          */
1123         SCpnt->transfersize = sdp->sector_size;
1124         SCpnt->underflow = this_count << 9;
1125         SCpnt->allowed = SD_MAX_RETRIES;
1126
1127         /*
1128          * This indicates that the command is ready from our end to be
1129          * queued.
1130          */
1131         ret = BLKPREP_OK;
1132  out:
1133         return ret;
1134 }
1135
1136 static int sd_init_command(struct scsi_cmnd *cmd)
1137 {
1138         struct request *rq = cmd->request;
1139
1140         if (rq->cmd_flags & REQ_DISCARD)
1141                 return sd_setup_discard_cmnd(cmd);
1142         else if (rq->cmd_flags & REQ_WRITE_SAME)
1143                 return sd_setup_write_same_cmnd(cmd);
1144         else if (rq->cmd_flags & REQ_FLUSH)
1145                 return sd_setup_flush_cmnd(cmd);
1146         else
1147                 return sd_setup_read_write_cmnd(cmd);
1148 }
1149
1150 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1151 {
1152         struct request *rq = SCpnt->request;
1153
1154         if (rq->cmd_flags & REQ_DISCARD)
1155                 __free_page(rq->completion_data);
1156
1157         if (SCpnt->cmnd != rq->cmd) {
1158                 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1159                 SCpnt->cmnd = NULL;
1160                 SCpnt->cmd_len = 0;
1161         }
1162 }
1163
1164 /**
1165  *      sd_open - open a scsi disk device
1166  *      @inode: only i_rdev member may be used
1167  *      @filp: only f_mode and f_flags may be used
1168  *
1169  *      Returns 0 if successful. Returns a negated errno value in case
1170  *      of error.
1171  *
1172  *      Note: This can be called from a user context (e.g. fsck(1) )
1173  *      or from within the kernel (e.g. as a result of a mount(1) ).
1174  *      In the latter case @inode and @filp carry an abridged amount
1175  *      of information as noted above.
1176  *
1177  *      Locking: called with bdev->bd_mutex held.
1178  **/
1179 static int sd_open(struct block_device *bdev, fmode_t mode)
1180 {
1181         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1182         struct scsi_device *sdev;
1183         int retval;
1184
1185         if (!sdkp)
1186                 return -ENXIO;
1187
1188         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1189
1190         sdev = sdkp->device;
1191
1192         /*
1193          * If the device is in error recovery, wait until it is done.
1194          * If the device is offline, then disallow any access to it.
1195          */
1196         retval = -ENXIO;
1197         if (!scsi_block_when_processing_errors(sdev))
1198                 goto error_out;
1199
1200         if (sdev->removable || sdkp->write_prot)
1201                 check_disk_change(bdev);
1202
1203         /*
1204          * If the drive is empty, just let the open fail.
1205          */
1206         retval = -ENOMEDIUM;
1207         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1208                 goto error_out;
1209
1210         /*
1211          * If the device has the write protect tab set, have the open fail
1212          * if the user expects to be able to write to the thing.
1213          */
1214         retval = -EROFS;
1215         if (sdkp->write_prot && (mode & FMODE_WRITE))
1216                 goto error_out;
1217
1218         /*
1219          * It is possible that the disk changing stuff resulted in
1220          * the device being taken offline.  If this is the case,
1221          * report this to the user, and don't pretend that the
1222          * open actually succeeded.
1223          */
1224         retval = -ENXIO;
1225         if (!scsi_device_online(sdev))
1226                 goto error_out;
1227
1228         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1229                 if (scsi_block_when_processing_errors(sdev))
1230                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1231         }
1232
1233         return 0;
1234
1235 error_out:
1236         scsi_disk_put(sdkp);
1237         return retval;
1238 }
1239
1240 /**
1241  *      sd_release - invoked when the (last) close(2) is called on this
1242  *      scsi disk.
1243  *      @inode: only i_rdev member may be used
1244  *      @filp: only f_mode and f_flags may be used
1245  *
1246  *      Returns 0.
1247  *
1248  *      Note: may block (uninterruptible) if error recovery is underway
1249  *      on this disk.
1250  *
1251  *      Locking: called with bdev->bd_mutex held.
1252  **/
1253 static void sd_release(struct gendisk *disk, fmode_t mode)
1254 {
1255         struct scsi_disk *sdkp = scsi_disk(disk);
1256         struct scsi_device *sdev = sdkp->device;
1257
1258         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1259
1260         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1261                 if (scsi_block_when_processing_errors(sdev))
1262                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1263         }
1264
1265         /*
1266          * XXX and what if there are packets in flight and this close()
1267          * XXX is followed by a "rmmod sd_mod"?
1268          */
1269
1270         scsi_disk_put(sdkp);
1271 }
1272
1273 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1274 {
1275         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1276         struct scsi_device *sdp = sdkp->device;
1277         struct Scsi_Host *host = sdp->host;
1278         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1279         int diskinfo[4];
1280
1281         /* default to most commonly used values */
1282         diskinfo[0] = 0x40;     /* 1 << 6 */
1283         diskinfo[1] = 0x20;     /* 1 << 5 */
1284         diskinfo[2] = capacity >> 11;
1285
1286         /* override with calculated, extended default, or driver values */
1287         if (host->hostt->bios_param)
1288                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1289         else
1290                 scsicam_bios_param(bdev, capacity, diskinfo);
1291
1292         geo->heads = diskinfo[0];
1293         geo->sectors = diskinfo[1];
1294         geo->cylinders = diskinfo[2];
1295         return 0;
1296 }
1297
1298 /**
1299  *      sd_ioctl - process an ioctl
1300  *      @inode: only i_rdev/i_bdev members may be used
1301  *      @filp: only f_mode and f_flags may be used
1302  *      @cmd: ioctl command number
1303  *      @arg: this is third argument given to ioctl(2) system call.
1304  *      Often contains a pointer.
1305  *
1306  *      Returns 0 if successful (some ioctls return positive numbers on
1307  *      success as well). Returns a negated errno value in case of error.
1308  *
1309  *      Note: most ioctls are forward onto the block subsystem or further
1310  *      down in the scsi subsystem.
1311  **/
1312 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1313                     unsigned int cmd, unsigned long arg)
1314 {
1315         struct gendisk *disk = bdev->bd_disk;
1316         struct scsi_disk *sdkp = scsi_disk(disk);
1317         struct scsi_device *sdp = sdkp->device;
1318         void __user *p = (void __user *)arg;
1319         int error;
1320
1321         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1322                                     "cmd=0x%x\n", disk->disk_name, cmd));
1323
1324         error = scsi_verify_blk_ioctl(bdev, cmd);
1325         if (error < 0)
1326                 return error;
1327
1328         /*
1329          * If we are in the middle of error recovery, don't let anyone
1330          * else try and use this device.  Also, if error recovery fails, it
1331          * may try and take the device offline, in which case all further
1332          * access to the device is prohibited.
1333          */
1334         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1335                         (mode & FMODE_NDELAY) != 0);
1336         if (error)
1337                 goto out;
1338
1339         /*
1340          * Send SCSI addressing ioctls directly to mid level, send other
1341          * ioctls to block level and then onto mid level if they can't be
1342          * resolved.
1343          */
1344         switch (cmd) {
1345                 case SCSI_IOCTL_GET_IDLUN:
1346                 case SCSI_IOCTL_GET_BUS_NUMBER:
1347                         error = scsi_ioctl(sdp, cmd, p);
1348                         break;
1349                 default:
1350                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1351                         if (error != -ENOTTY)
1352                                 break;
1353                         error = scsi_ioctl(sdp, cmd, p);
1354                         break;
1355         }
1356 out:
1357         return error;
1358 }
1359
1360 static void set_media_not_present(struct scsi_disk *sdkp)
1361 {
1362         if (sdkp->media_present)
1363                 sdkp->device->changed = 1;
1364
1365         if (sdkp->device->removable) {
1366                 sdkp->media_present = 0;
1367                 sdkp->capacity = 0;
1368         }
1369 }
1370
1371 static int media_not_present(struct scsi_disk *sdkp,
1372                              struct scsi_sense_hdr *sshdr)
1373 {
1374         if (!scsi_sense_valid(sshdr))
1375                 return 0;
1376
1377         /* not invoked for commands that could return deferred errors */
1378         switch (sshdr->sense_key) {
1379         case UNIT_ATTENTION:
1380         case NOT_READY:
1381                 /* medium not present */
1382                 if (sshdr->asc == 0x3A) {
1383                         set_media_not_present(sdkp);
1384                         return 1;
1385                 }
1386         }
1387         return 0;
1388 }
1389
1390 /**
1391  *      sd_check_events - check media events
1392  *      @disk: kernel device descriptor
1393  *      @clearing: disk events currently being cleared
1394  *
1395  *      Returns mask of DISK_EVENT_*.
1396  *
1397  *      Note: this function is invoked from the block subsystem.
1398  **/
1399 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1400 {
1401         struct scsi_disk *sdkp = scsi_disk(disk);
1402         struct scsi_device *sdp = sdkp->device;
1403         struct scsi_sense_hdr *sshdr = NULL;
1404         int retval;
1405
1406         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1407
1408         /*
1409          * If the device is offline, don't send any commands - just pretend as
1410          * if the command failed.  If the device ever comes back online, we
1411          * can deal with it then.  It is only because of unrecoverable errors
1412          * that we would ever take a device offline in the first place.
1413          */
1414         if (!scsi_device_online(sdp)) {
1415                 set_media_not_present(sdkp);
1416                 goto out;
1417         }
1418
1419         /*
1420          * Using TEST_UNIT_READY enables differentiation between drive with
1421          * no cartridge loaded - NOT READY, drive with changed cartridge -
1422          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1423          *
1424          * Drives that auto spin down. eg iomega jaz 1G, will be started
1425          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1426          * sd_revalidate() is called.
1427          */
1428         retval = -ENODEV;
1429
1430         if (scsi_block_when_processing_errors(sdp)) {
1431                 sshdr  = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1432                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1433                                               sshdr);
1434         }
1435
1436         /* failed to execute TUR, assume media not present */
1437         if (host_byte(retval)) {
1438                 set_media_not_present(sdkp);
1439                 goto out;
1440         }
1441
1442         if (media_not_present(sdkp, sshdr))
1443                 goto out;
1444
1445         /*
1446          * For removable scsi disk we have to recognise the presence
1447          * of a disk in the drive.
1448          */
1449         if (!sdkp->media_present)
1450                 sdp->changed = 1;
1451         sdkp->media_present = 1;
1452 out:
1453         /*
1454          * sdp->changed is set under the following conditions:
1455          *
1456          *      Medium present state has changed in either direction.
1457          *      Device has indicated UNIT_ATTENTION.
1458          */
1459         kfree(sshdr);
1460         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1461         sdp->changed = 0;
1462         return retval;
1463 }
1464
1465 static int sd_sync_cache(struct scsi_disk *sdkp)
1466 {
1467         int retries, res;
1468         struct scsi_device *sdp = sdkp->device;
1469         const int timeout = sdp->request_queue->rq_timeout
1470                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1471         struct scsi_sense_hdr sshdr;
1472
1473         if (!scsi_device_online(sdp))
1474                 return -ENODEV;
1475
1476         for (retries = 3; retries > 0; --retries) {
1477                 unsigned char cmd[10] = { 0 };
1478
1479                 cmd[0] = SYNCHRONIZE_CACHE;
1480                 /*
1481                  * Leave the rest of the command zero to indicate
1482                  * flush everything.
1483                  */
1484                 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1485                                              &sshdr, timeout, SD_MAX_RETRIES,
1486                                              NULL, REQ_PM);
1487                 if (res == 0)
1488                         break;
1489         }
1490
1491         if (res) {
1492                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1493
1494                 if (driver_byte(res) & DRIVER_SENSE)
1495                         sd_print_sense_hdr(sdkp, &sshdr);
1496                 /* we need to evaluate the error return  */
1497                 if (scsi_sense_valid(&sshdr) &&
1498                         (sshdr.asc == 0x3a ||   /* medium not present */
1499                          sshdr.asc == 0x20))    /* invalid command */
1500                                 /* this is no error here */
1501                                 return 0;
1502
1503                 switch (host_byte(res)) {
1504                 /* ignore errors due to racing a disconnection */
1505                 case DID_BAD_TARGET:
1506                 case DID_NO_CONNECT:
1507                         return 0;
1508                 /* signal the upper layer it might try again */
1509                 case DID_BUS_BUSY:
1510                 case DID_IMM_RETRY:
1511                 case DID_REQUEUE:
1512                 case DID_SOFT_ERROR:
1513                         return -EBUSY;
1514                 default:
1515                         return -EIO;
1516                 }
1517         }
1518         return 0;
1519 }
1520
1521 static void sd_rescan(struct device *dev)
1522 {
1523         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1524
1525         revalidate_disk(sdkp->disk);
1526 }
1527
1528
1529 #ifdef CONFIG_COMPAT
1530 /*
1531  * This gets directly called from VFS. When the ioctl
1532  * is not recognized we go back to the other translation paths.
1533  */
1534 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1535                            unsigned int cmd, unsigned long arg)
1536 {
1537         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1538         int error;
1539
1540         error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1541                         (mode & FMODE_NDELAY) != 0);
1542         if (error)
1543                 return error;
1544
1545         /*
1546          * Let the static ioctl translation table take care of it.
1547          */
1548         if (!sdev->host->hostt->compat_ioctl)
1549                 return -ENOIOCTLCMD;
1550         return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1551 }
1552 #endif
1553
1554 static char sd_pr_type(enum pr_type type)
1555 {
1556         switch (type) {
1557         case PR_WRITE_EXCLUSIVE:
1558                 return 0x01;
1559         case PR_EXCLUSIVE_ACCESS:
1560                 return 0x03;
1561         case PR_WRITE_EXCLUSIVE_REG_ONLY:
1562                 return 0x05;
1563         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1564                 return 0x06;
1565         case PR_WRITE_EXCLUSIVE_ALL_REGS:
1566                 return 0x07;
1567         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1568                 return 0x08;
1569         default:
1570                 return 0;
1571         }
1572 };
1573
1574 static int sd_pr_command(struct block_device *bdev, u8 sa,
1575                 u64 key, u64 sa_key, u8 type, u8 flags)
1576 {
1577         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1578         struct scsi_sense_hdr sshdr;
1579         int result;
1580         u8 cmd[16] = { 0, };
1581         u8 data[24] = { 0, };
1582
1583         cmd[0] = PERSISTENT_RESERVE_OUT;
1584         cmd[1] = sa;
1585         cmd[2] = type;
1586         put_unaligned_be32(sizeof(data), &cmd[5]);
1587
1588         put_unaligned_be64(key, &data[0]);
1589         put_unaligned_be64(sa_key, &data[8]);
1590         data[20] = flags;
1591
1592         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1593                         &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1594
1595         if ((driver_byte(result) & DRIVER_SENSE) &&
1596             (scsi_sense_valid(&sshdr))) {
1597                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1598                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1599         }
1600
1601         return result;
1602 }
1603
1604 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1605                 u32 flags)
1606 {
1607         if (flags & ~PR_FL_IGNORE_KEY)
1608                 return -EOPNOTSUPP;
1609         return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1610                         old_key, new_key, 0,
1611                         (1 << 0) /* APTPL */ |
1612                         (1 << 2) /* ALL_TG_PT */);
1613 }
1614
1615 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1616                 u32 flags)
1617 {
1618         if (flags)
1619                 return -EOPNOTSUPP;
1620         return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1621 }
1622
1623 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1624 {
1625         return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1626 }
1627
1628 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1629                 enum pr_type type, bool abort)
1630 {
1631         return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1632                              sd_pr_type(type), 0);
1633 }
1634
1635 static int sd_pr_clear(struct block_device *bdev, u64 key)
1636 {
1637         return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1638 }
1639
1640 static const struct pr_ops sd_pr_ops = {
1641         .pr_register    = sd_pr_register,
1642         .pr_reserve     = sd_pr_reserve,
1643         .pr_release     = sd_pr_release,
1644         .pr_preempt     = sd_pr_preempt,
1645         .pr_clear       = sd_pr_clear,
1646 };
1647
1648 static const struct block_device_operations sd_fops = {
1649         .owner                  = THIS_MODULE,
1650         .open                   = sd_open,
1651         .release                = sd_release,
1652         .ioctl                  = sd_ioctl,
1653         .getgeo                 = sd_getgeo,
1654 #ifdef CONFIG_COMPAT
1655         .compat_ioctl           = sd_compat_ioctl,
1656 #endif
1657         .check_events           = sd_check_events,
1658         .revalidate_disk        = sd_revalidate_disk,
1659         .unlock_native_capacity = sd_unlock_native_capacity,
1660         .pr_ops                 = &sd_pr_ops,
1661 };
1662
1663 /**
1664  *      sd_eh_action - error handling callback
1665  *      @scmd:          sd-issued command that has failed
1666  *      @eh_disp:       The recovery disposition suggested by the midlayer
1667  *
1668  *      This function is called by the SCSI midlayer upon completion of an
1669  *      error test command (currently TEST UNIT READY). The result of sending
1670  *      the eh command is passed in eh_disp.  We're looking for devices that
1671  *      fail medium access commands but are OK with non access commands like
1672  *      test unit ready (so wrongly see the device as having a successful
1673  *      recovery)
1674  **/
1675 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1676 {
1677         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1678
1679         if (!scsi_device_online(scmd->device) ||
1680             !scsi_medium_access_command(scmd) ||
1681             host_byte(scmd->result) != DID_TIME_OUT ||
1682             eh_disp != SUCCESS)
1683                 return eh_disp;
1684
1685         /*
1686          * The device has timed out executing a medium access command.
1687          * However, the TEST UNIT READY command sent during error
1688          * handling completed successfully. Either the device is in the
1689          * process of recovering or has it suffered an internal failure
1690          * that prevents access to the storage medium.
1691          */
1692         sdkp->medium_access_timed_out++;
1693
1694         /*
1695          * If the device keeps failing read/write commands but TEST UNIT
1696          * READY always completes successfully we assume that medium
1697          * access is no longer possible and take the device offline.
1698          */
1699         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1700                 scmd_printk(KERN_ERR, scmd,
1701                             "Medium access timeout failure. Offlining disk!\n");
1702                 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1703
1704                 return FAILED;
1705         }
1706
1707         return eh_disp;
1708 }
1709
1710 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1711 {
1712         u64 start_lba = blk_rq_pos(scmd->request);
1713         u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1714         u64 factor = scmd->device->sector_size / 512;
1715         u64 bad_lba;
1716         int info_valid;
1717         /*
1718          * resid is optional but mostly filled in.  When it's unused,
1719          * its value is zero, so we assume the whole buffer transferred
1720          */
1721         unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1722         unsigned int good_bytes;
1723
1724         if (scmd->request->cmd_type != REQ_TYPE_FS)
1725                 return 0;
1726
1727         info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1728                                              SCSI_SENSE_BUFFERSIZE,
1729                                              &bad_lba);
1730         if (!info_valid)
1731                 return 0;
1732
1733         if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1734                 return 0;
1735
1736         /* be careful ... don't want any overflows */
1737         do_div(start_lba, factor);
1738         do_div(end_lba, factor);
1739
1740         /* The bad lba was reported incorrectly, we have no idea where
1741          * the error is.
1742          */
1743         if (bad_lba < start_lba  || bad_lba >= end_lba)
1744                 return 0;
1745
1746         /* This computation should always be done in terms of
1747          * the resolution of the device's medium.
1748          */
1749         good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1750         return min(good_bytes, transferred);
1751 }
1752
1753 /**
1754  *      sd_done - bottom half handler: called when the lower level
1755  *      driver has completed (successfully or otherwise) a scsi command.
1756  *      @SCpnt: mid-level's per command structure.
1757  *
1758  *      Note: potentially run from within an ISR. Must not block.
1759  **/
1760 static int sd_done(struct scsi_cmnd *SCpnt)
1761 {
1762         int result = SCpnt->result;
1763         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1764         struct scsi_sense_hdr sshdr;
1765         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1766         struct request *req = SCpnt->request;
1767         int sense_valid = 0;
1768         int sense_deferred = 0;
1769         unsigned char op = SCpnt->cmnd[0];
1770         unsigned char unmap = SCpnt->cmnd[1] & 8;
1771
1772         if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1773                 if (!result) {
1774                         good_bytes = blk_rq_bytes(req);
1775                         scsi_set_resid(SCpnt, 0);
1776                 } else {
1777                         good_bytes = 0;
1778                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1779                 }
1780         }
1781
1782         if (result) {
1783                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1784                 if (sense_valid)
1785                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1786         }
1787         sdkp->medium_access_timed_out = 0;
1788
1789         if (driver_byte(result) != DRIVER_SENSE &&
1790             (!sense_valid || sense_deferred))
1791                 goto out;
1792
1793         switch (sshdr.sense_key) {
1794         case HARDWARE_ERROR:
1795         case MEDIUM_ERROR:
1796                 good_bytes = sd_completed_bytes(SCpnt);
1797                 break;
1798         case RECOVERED_ERROR:
1799                 good_bytes = scsi_bufflen(SCpnt);
1800                 break;
1801         case NO_SENSE:
1802                 /* This indicates a false check condition, so ignore it.  An
1803                  * unknown amount of data was transferred so treat it as an
1804                  * error.
1805                  */
1806                 SCpnt->result = 0;
1807                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1808                 break;
1809         case ABORTED_COMMAND:
1810                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
1811                         good_bytes = sd_completed_bytes(SCpnt);
1812                 break;
1813         case ILLEGAL_REQUEST:
1814                 if (sshdr.asc == 0x10)  /* DIX: Host detected corruption */
1815                         good_bytes = sd_completed_bytes(SCpnt);
1816                 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1817                 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1818                         switch (op) {
1819                         case UNMAP:
1820                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
1821                                 break;
1822                         case WRITE_SAME_16:
1823                         case WRITE_SAME:
1824                                 if (unmap)
1825                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
1826                                 else {
1827                                         sdkp->device->no_write_same = 1;
1828                                         sd_config_write_same(sdkp);
1829
1830                                         good_bytes = 0;
1831                                         req->__data_len = blk_rq_bytes(req);
1832                                         req->cmd_flags |= REQ_QUIET;
1833                                 }
1834                         }
1835                 }
1836                 break;
1837         default:
1838                 break;
1839         }
1840  out:
1841         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1842                                            "sd_done: completed %d of %d bytes\n",
1843                                            good_bytes, scsi_bufflen(SCpnt)));
1844
1845         if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1846                 sd_dif_complete(SCpnt, good_bytes);
1847
1848         return good_bytes;
1849 }
1850
1851 /*
1852  * spinup disk - called only in sd_revalidate_disk()
1853  */
1854 static void
1855 sd_spinup_disk(struct scsi_disk *sdkp)
1856 {
1857         unsigned char cmd[10];
1858         unsigned long spintime_expire = 0;
1859         int retries, spintime;
1860         unsigned int the_result;
1861         struct scsi_sense_hdr sshdr;
1862         int sense_valid = 0;
1863
1864         spintime = 0;
1865
1866         /* Spin up drives, as required.  Only do this at boot time */
1867         /* Spinup needs to be done for module loads too. */
1868         do {
1869                 retries = 0;
1870
1871                 do {
1872                         cmd[0] = TEST_UNIT_READY;
1873                         memset((void *) &cmd[1], 0, 9);
1874
1875                         the_result = scsi_execute_req(sdkp->device, cmd,
1876                                                       DMA_NONE, NULL, 0,
1877                                                       &sshdr, SD_TIMEOUT,
1878                                                       SD_MAX_RETRIES, NULL);
1879
1880                         /*
1881                          * If the drive has indicated to us that it
1882                          * doesn't have any media in it, don't bother
1883                          * with any more polling.
1884                          */
1885                         if (media_not_present(sdkp, &sshdr))
1886                                 return;
1887
1888                         if (the_result)
1889                                 sense_valid = scsi_sense_valid(&sshdr);
1890                         retries++;
1891                 } while (retries < 3 &&
1892                          (!scsi_status_is_good(the_result) ||
1893                           ((driver_byte(the_result) & DRIVER_SENSE) &&
1894                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1895
1896                 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1897                         /* no sense, TUR either succeeded or failed
1898                          * with a status error */
1899                         if(!spintime && !scsi_status_is_good(the_result)) {
1900                                 sd_print_result(sdkp, "Test Unit Ready failed",
1901                                                 the_result);
1902                         }
1903                         break;
1904                 }
1905
1906                 /*
1907                  * The device does not want the automatic start to be issued.
1908                  */
1909                 if (sdkp->device->no_start_on_add)
1910                         break;
1911
1912                 if (sense_valid && sshdr.sense_key == NOT_READY) {
1913                         if (sshdr.asc == 4 && sshdr.ascq == 3)
1914                                 break;  /* manual intervention required */
1915                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1916                                 break;  /* standby */
1917                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1918                                 break;  /* unavailable */
1919                         /*
1920                          * Issue command to spin up drive when not ready
1921                          */
1922                         if (!spintime) {
1923                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1924                                 cmd[0] = START_STOP;
1925                                 cmd[1] = 1;     /* Return immediately */
1926                                 memset((void *) &cmd[2], 0, 8);
1927                                 cmd[4] = 1;     /* Start spin cycle */
1928                                 if (sdkp->device->start_stop_pwr_cond)
1929                                         cmd[4] |= 1 << 4;
1930                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1931                                                  NULL, 0, &sshdr,
1932                                                  SD_TIMEOUT, SD_MAX_RETRIES,
1933                                                  NULL);
1934                                 spintime_expire = jiffies + 100 * HZ;
1935                                 spintime = 1;
1936                         }
1937                         /* Wait 1 second for next try */
1938                         msleep(1000);
1939                         printk(".");
1940
1941                 /*
1942                  * Wait for USB flash devices with slow firmware.
1943                  * Yes, this sense key/ASC combination shouldn't
1944                  * occur here.  It's characteristic of these devices.
1945                  */
1946                 } else if (sense_valid &&
1947                                 sshdr.sense_key == UNIT_ATTENTION &&
1948                                 sshdr.asc == 0x28) {
1949                         if (!spintime) {
1950                                 spintime_expire = jiffies + 5 * HZ;
1951                                 spintime = 1;
1952                         }
1953                         /* Wait 1 second for next try */
1954                         msleep(1000);
1955                 } else {
1956                         /* we don't understand the sense code, so it's
1957                          * probably pointless to loop */
1958                         if(!spintime) {
1959                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1960                                 sd_print_sense_hdr(sdkp, &sshdr);
1961                         }
1962                         break;
1963                 }
1964
1965         } while (spintime && time_before_eq(jiffies, spintime_expire));
1966
1967         if (spintime) {
1968                 if (scsi_status_is_good(the_result))
1969                         printk("ready\n");
1970                 else
1971                         printk("not responding...\n");
1972         }
1973 }
1974
1975
1976 /*
1977  * Determine whether disk supports Data Integrity Field.
1978  */
1979 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1980 {
1981         struct scsi_device *sdp = sdkp->device;
1982         u8 type;
1983         int ret = 0;
1984
1985         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1986                 return ret;
1987
1988         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1989
1990         if (type > SD_DIF_TYPE3_PROTECTION)
1991                 ret = -ENODEV;
1992         else if (scsi_host_dif_capable(sdp->host, type))
1993                 ret = 1;
1994
1995         if (sdkp->first_scan || type != sdkp->protection_type)
1996                 switch (ret) {
1997                 case -ENODEV:
1998                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1999                                   " protection type %u. Disabling disk!\n",
2000                                   type);
2001                         break;
2002                 case 1:
2003                         sd_printk(KERN_NOTICE, sdkp,
2004                                   "Enabling DIF Type %u protection\n", type);
2005                         break;
2006                 case 0:
2007                         sd_printk(KERN_NOTICE, sdkp,
2008                                   "Disabling DIF Type %u protection\n", type);
2009                         break;
2010                 }
2011
2012         sdkp->protection_type = type;
2013
2014         return ret;
2015 }
2016
2017 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2018                         struct scsi_sense_hdr *sshdr, int sense_valid,
2019                         int the_result)
2020 {
2021         if (driver_byte(the_result) & DRIVER_SENSE)
2022                 sd_print_sense_hdr(sdkp, sshdr);
2023         else
2024                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2025
2026         /*
2027          * Set dirty bit for removable devices if not ready -
2028          * sometimes drives will not report this properly.
2029          */
2030         if (sdp->removable &&
2031             sense_valid && sshdr->sense_key == NOT_READY)
2032                 set_media_not_present(sdkp);
2033
2034         /*
2035          * We used to set media_present to 0 here to indicate no media
2036          * in the drive, but some drives fail read capacity even with
2037          * media present, so we can't do that.
2038          */
2039         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2040 }
2041
2042 #define RC16_LEN 32
2043 #if RC16_LEN > SD_BUF_SIZE
2044 #error RC16_LEN must not be more than SD_BUF_SIZE
2045 #endif
2046
2047 #define READ_CAPACITY_RETRIES_ON_RESET  10
2048
2049 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2050                                                 unsigned char *buffer)
2051 {
2052         unsigned char cmd[16];
2053         struct scsi_sense_hdr sshdr;
2054         int sense_valid = 0;
2055         int the_result;
2056         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2057         unsigned int alignment;
2058         unsigned long long lba;
2059         unsigned sector_size;
2060
2061         if (sdp->no_read_capacity_16)
2062                 return -EINVAL;
2063
2064         do {
2065                 memset(cmd, 0, 16);
2066                 cmd[0] = SERVICE_ACTION_IN_16;
2067                 cmd[1] = SAI_READ_CAPACITY_16;
2068                 cmd[13] = RC16_LEN;
2069                 memset(buffer, 0, RC16_LEN);
2070
2071                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2072                                         buffer, RC16_LEN, &sshdr,
2073                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2074
2075                 if (media_not_present(sdkp, &sshdr))
2076                         return -ENODEV;
2077
2078                 if (the_result) {
2079                         sense_valid = scsi_sense_valid(&sshdr);
2080                         if (sense_valid &&
2081                             sshdr.sense_key == ILLEGAL_REQUEST &&
2082                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2083                             sshdr.ascq == 0x00)
2084                                 /* Invalid Command Operation Code or
2085                                  * Invalid Field in CDB, just retry
2086                                  * silently with RC10 */
2087                                 return -EINVAL;
2088                         if (sense_valid &&
2089                             sshdr.sense_key == UNIT_ATTENTION &&
2090                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2091                                 /* Device reset might occur several times,
2092                                  * give it one more chance */
2093                                 if (--reset_retries > 0)
2094                                         continue;
2095                 }
2096                 retries--;
2097
2098         } while (the_result && retries);
2099
2100         if (the_result) {
2101                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2102                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2103                 return -EINVAL;
2104         }
2105
2106         sector_size = get_unaligned_be32(&buffer[8]);
2107         lba = get_unaligned_be64(&buffer[0]);
2108
2109         if (sd_read_protection_type(sdkp, buffer) < 0) {
2110                 sdkp->capacity = 0;
2111                 return -ENODEV;
2112         }
2113
2114         if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2115                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2116                         "kernel compiled with support for large block "
2117                         "devices.\n");
2118                 sdkp->capacity = 0;
2119                 return -EOVERFLOW;
2120         }
2121
2122         /* Logical blocks per physical block exponent */
2123         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2124
2125         /* Lowest aligned logical block */
2126         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2127         blk_queue_alignment_offset(sdp->request_queue, alignment);
2128         if (alignment && sdkp->first_scan)
2129                 sd_printk(KERN_NOTICE, sdkp,
2130                           "physical block alignment offset: %u\n", alignment);
2131
2132         if (buffer[14] & 0x80) { /* LBPME */
2133                 sdkp->lbpme = 1;
2134
2135                 if (buffer[14] & 0x40) /* LBPRZ */
2136                         sdkp->lbprz = 1;
2137
2138                 sd_config_discard(sdkp, SD_LBP_WS16);
2139         }
2140
2141         sdkp->capacity = lba + 1;
2142         return sector_size;
2143 }
2144
2145 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2146                                                 unsigned char *buffer)
2147 {
2148         unsigned char cmd[16];
2149         struct scsi_sense_hdr sshdr;
2150         int sense_valid = 0;
2151         int the_result;
2152         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2153         sector_t lba;
2154         unsigned sector_size;
2155
2156         do {
2157                 cmd[0] = READ_CAPACITY;
2158                 memset(&cmd[1], 0, 9);
2159                 memset(buffer, 0, 8);
2160
2161                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2162                                         buffer, 8, &sshdr,
2163                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2164
2165                 if (media_not_present(sdkp, &sshdr))
2166                         return -ENODEV;
2167
2168                 if (the_result) {
2169                         sense_valid = scsi_sense_valid(&sshdr);
2170                         if (sense_valid &&
2171                             sshdr.sense_key == UNIT_ATTENTION &&
2172                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2173                                 /* Device reset might occur several times,
2174                                  * give it one more chance */
2175                                 if (--reset_retries > 0)
2176                                         continue;
2177                 }
2178                 retries--;
2179
2180         } while (the_result && retries);
2181
2182         if (the_result) {
2183                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2184                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2185                 return -EINVAL;
2186         }
2187
2188         sector_size = get_unaligned_be32(&buffer[4]);
2189         lba = get_unaligned_be32(&buffer[0]);
2190
2191         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2192                 /* Some buggy (usb cardreader) devices return an lba of
2193                    0xffffffff when the want to report a size of 0 (with
2194                    which they really mean no media is present) */
2195                 sdkp->capacity = 0;
2196                 sdkp->physical_block_size = sector_size;
2197                 return sector_size;
2198         }
2199
2200         if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2201                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2202                         "kernel compiled with support for large block "
2203                         "devices.\n");
2204                 sdkp->capacity = 0;
2205                 return -EOVERFLOW;
2206         }
2207
2208         sdkp->capacity = lba + 1;
2209         sdkp->physical_block_size = sector_size;
2210         return sector_size;
2211 }
2212
2213 static int sd_try_rc16_first(struct scsi_device *sdp)
2214 {
2215         if (sdp->host->max_cmd_len < 16)
2216                 return 0;
2217         if (sdp->try_rc_10_first)
2218                 return 0;
2219         if (sdp->scsi_level > SCSI_SPC_2)
2220                 return 1;
2221         if (scsi_device_protection(sdp))
2222                 return 1;
2223         return 0;
2224 }
2225
2226 /*
2227  * read disk capacity
2228  */
2229 static void
2230 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2231 {
2232         int sector_size;
2233         struct scsi_device *sdp = sdkp->device;
2234         sector_t old_capacity = sdkp->capacity;
2235
2236         if (sd_try_rc16_first(sdp)) {
2237                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2238                 if (sector_size == -EOVERFLOW)
2239                         goto got_data;
2240                 if (sector_size == -ENODEV)
2241                         return;
2242                 if (sector_size < 0)
2243                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2244                 if (sector_size < 0)
2245                         return;
2246         } else {
2247                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2248                 if (sector_size == -EOVERFLOW)
2249                         goto got_data;
2250                 if (sector_size < 0)
2251                         return;
2252                 if ((sizeof(sdkp->capacity) > 4) &&
2253                     (sdkp->capacity > 0xffffffffULL)) {
2254                         int old_sector_size = sector_size;
2255                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2256                                         "Trying to use READ CAPACITY(16).\n");
2257                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2258                         if (sector_size < 0) {
2259                                 sd_printk(KERN_NOTICE, sdkp,
2260                                         "Using 0xffffffff as device size\n");
2261                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2262                                 sector_size = old_sector_size;
2263                                 goto got_data;
2264                         }
2265                 }
2266         }
2267
2268         /* Some devices are known to return the total number of blocks,
2269          * not the highest block number.  Some devices have versions
2270          * which do this and others which do not.  Some devices we might
2271          * suspect of doing this but we don't know for certain.
2272          *
2273          * If we know the reported capacity is wrong, decrement it.  If
2274          * we can only guess, then assume the number of blocks is even
2275          * (usually true but not always) and err on the side of lowering
2276          * the capacity.
2277          */
2278         if (sdp->fix_capacity ||
2279             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2280                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2281                                 "from its reported value: %llu\n",
2282                                 (unsigned long long) sdkp->capacity);
2283                 --sdkp->capacity;
2284         }
2285
2286 got_data:
2287         if (sector_size == 0) {
2288                 sector_size = 512;
2289                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2290                           "assuming 512.\n");
2291         }
2292
2293         if (sector_size != 512 &&
2294             sector_size != 1024 &&
2295             sector_size != 2048 &&
2296             sector_size != 4096) {
2297                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2298                           sector_size);
2299                 /*
2300                  * The user might want to re-format the drive with
2301                  * a supported sectorsize.  Once this happens, it
2302                  * would be relatively trivial to set the thing up.
2303                  * For this reason, we leave the thing in the table.
2304                  */
2305                 sdkp->capacity = 0;
2306                 /*
2307                  * set a bogus sector size so the normal read/write
2308                  * logic in the block layer will eventually refuse any
2309                  * request on this device without tripping over power
2310                  * of two sector size assumptions
2311                  */
2312                 sector_size = 512;
2313         }
2314         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2315
2316         {
2317                 char cap_str_2[10], cap_str_10[10];
2318
2319                 string_get_size(sdkp->capacity, sector_size,
2320                                 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2321                 string_get_size(sdkp->capacity, sector_size,
2322                                 STRING_UNITS_10, cap_str_10,
2323                                 sizeof(cap_str_10));
2324
2325                 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2326                         sd_printk(KERN_NOTICE, sdkp,
2327                                   "%llu %d-byte logical blocks: (%s/%s)\n",
2328                                   (unsigned long long)sdkp->capacity,
2329                                   sector_size, cap_str_10, cap_str_2);
2330
2331                         if (sdkp->physical_block_size != sector_size)
2332                                 sd_printk(KERN_NOTICE, sdkp,
2333                                           "%u-byte physical blocks\n",
2334                                           sdkp->physical_block_size);
2335                 }
2336         }
2337
2338         if (sdkp->capacity > 0xffffffff)
2339                 sdp->use_16_for_rw = 1;
2340
2341         blk_queue_physical_block_size(sdp->request_queue,
2342                                       sdkp->physical_block_size);
2343         sdkp->device->sector_size = sector_size;
2344 }
2345
2346 /* called with buffer of length 512 */
2347 static inline int
2348 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2349                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2350                  struct scsi_sense_hdr *sshdr)
2351 {
2352         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2353                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2354                                sshdr);
2355 }
2356
2357 /*
2358  * read write protect setting, if possible - called only in sd_revalidate_disk()
2359  * called with buffer of length SD_BUF_SIZE
2360  */
2361 static void
2362 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2363 {
2364         int res;
2365         struct scsi_device *sdp = sdkp->device;
2366         struct scsi_mode_data data;
2367         int old_wp = sdkp->write_prot;
2368
2369         set_disk_ro(sdkp->disk, 0);
2370         if (sdp->skip_ms_page_3f) {
2371                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2372                 return;
2373         }
2374
2375         if (sdp->use_192_bytes_for_3f) {
2376                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2377         } else {
2378                 /*
2379                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2380                  * We have to start carefully: some devices hang if we ask
2381                  * for more than is available.
2382                  */
2383                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2384
2385                 /*
2386                  * Second attempt: ask for page 0 When only page 0 is
2387                  * implemented, a request for page 3F may return Sense Key
2388                  * 5: Illegal Request, Sense Code 24: Invalid field in
2389                  * CDB.
2390                  */
2391                 if (!scsi_status_is_good(res))
2392                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2393
2394                 /*
2395                  * Third attempt: ask 255 bytes, as we did earlier.
2396                  */
2397                 if (!scsi_status_is_good(res))
2398                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2399                                                &data, NULL);
2400         }
2401
2402         if (!scsi_status_is_good(res)) {
2403                 sd_first_printk(KERN_WARNING, sdkp,
2404                           "Test WP failed, assume Write Enabled\n");
2405         } else {
2406                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2407                 set_disk_ro(sdkp->disk, sdkp->write_prot);
2408                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2409                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2410                                   sdkp->write_prot ? "on" : "off");
2411                         sd_printk(KERN_DEBUG, sdkp,
2412                                   "Mode Sense: %02x %02x %02x %02x\n",
2413                                   buffer[0], buffer[1], buffer[2], buffer[3]);
2414                 }
2415         }
2416 }
2417
2418 /*
2419  * sd_read_cache_type - called only from sd_revalidate_disk()
2420  * called with buffer of length SD_BUF_SIZE
2421  */
2422 static void
2423 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2424 {
2425         int len = 0, res;
2426         struct scsi_device *sdp = sdkp->device;
2427
2428         int dbd;
2429         int modepage;
2430         int first_len;
2431         struct scsi_mode_data data;
2432         struct scsi_sense_hdr sshdr;
2433         int old_wce = sdkp->WCE;
2434         int old_rcd = sdkp->RCD;
2435         int old_dpofua = sdkp->DPOFUA;
2436
2437
2438         if (sdkp->cache_override)
2439                 return;
2440
2441         first_len = 4;
2442         if (sdp->skip_ms_page_8) {
2443                 if (sdp->type == TYPE_RBC)
2444                         goto defaults;
2445                 else {
2446                         if (sdp->skip_ms_page_3f)
2447                                 goto defaults;
2448                         modepage = 0x3F;
2449                         if (sdp->use_192_bytes_for_3f)
2450                                 first_len = 192;
2451                         dbd = 0;
2452                 }
2453         } else if (sdp->type == TYPE_RBC) {
2454                 modepage = 6;
2455                 dbd = 8;
2456         } else {
2457                 modepage = 8;
2458                 dbd = 0;
2459         }
2460
2461         /* cautiously ask */
2462         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2463                         &data, &sshdr);
2464
2465         if (!scsi_status_is_good(res))
2466                 goto bad_sense;
2467
2468         if (!data.header_length) {
2469                 modepage = 6;
2470                 first_len = 0;
2471                 sd_first_printk(KERN_ERR, sdkp,
2472                                 "Missing header in MODE_SENSE response\n");
2473         }
2474
2475         /* that went OK, now ask for the proper length */
2476         len = data.length;
2477
2478         /*
2479          * We're only interested in the first three bytes, actually.
2480          * But the data cache page is defined for the first 20.
2481          */
2482         if (len < 3)
2483                 goto bad_sense;
2484         else if (len > SD_BUF_SIZE) {
2485                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2486                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2487                 len = SD_BUF_SIZE;
2488         }
2489         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2490                 len = 192;
2491
2492         /* Get the data */
2493         if (len > first_len)
2494                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2495                                 &data, &sshdr);
2496
2497         if (scsi_status_is_good(res)) {
2498                 int offset = data.header_length + data.block_descriptor_length;
2499
2500                 while (offset < len) {
2501                         u8 page_code = buffer[offset] & 0x3F;
2502                         u8 spf       = buffer[offset] & 0x40;
2503
2504                         if (page_code == 8 || page_code == 6) {
2505                                 /* We're interested only in the first 3 bytes.
2506                                  */
2507                                 if (len - offset <= 2) {
2508                                         sd_first_printk(KERN_ERR, sdkp,
2509                                                 "Incomplete mode parameter "
2510                                                         "data\n");
2511                                         goto defaults;
2512                                 } else {
2513                                         modepage = page_code;
2514                                         goto Page_found;
2515                                 }
2516                         } else {
2517                                 /* Go to the next page */
2518                                 if (spf && len - offset > 3)
2519                                         offset += 4 + (buffer[offset+2] << 8) +
2520                                                 buffer[offset+3];
2521                                 else if (!spf && len - offset > 1)
2522                                         offset += 2 + buffer[offset+1];
2523                                 else {
2524                                         sd_first_printk(KERN_ERR, sdkp,
2525                                                         "Incomplete mode "
2526                                                         "parameter data\n");
2527                                         goto defaults;
2528                                 }
2529                         }
2530                 }
2531
2532                 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2533                 goto defaults;
2534
2535         Page_found:
2536                 if (modepage == 8) {
2537                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2538                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2539                 } else {
2540                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2541                         sdkp->RCD = 0;
2542                 }
2543
2544                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2545                 if (sdp->broken_fua) {
2546                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2547                         sdkp->DPOFUA = 0;
2548                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2549                         sd_first_printk(KERN_NOTICE, sdkp,
2550                                   "Uses READ/WRITE(6), disabling FUA\n");
2551                         sdkp->DPOFUA = 0;
2552                 }
2553
2554                 /* No cache flush allowed for write protected devices */
2555                 if (sdkp->WCE && sdkp->write_prot)
2556                         sdkp->WCE = 0;
2557
2558                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2559                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2560                         sd_printk(KERN_NOTICE, sdkp,
2561                                   "Write cache: %s, read cache: %s, %s\n",
2562                                   sdkp->WCE ? "enabled" : "disabled",
2563                                   sdkp->RCD ? "disabled" : "enabled",
2564                                   sdkp->DPOFUA ? "supports DPO and FUA"
2565                                   : "doesn't support DPO or FUA");
2566
2567                 return;
2568         }
2569
2570 bad_sense:
2571         if (scsi_sense_valid(&sshdr) &&
2572             sshdr.sense_key == ILLEGAL_REQUEST &&
2573             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2574                 /* Invalid field in CDB */
2575                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2576         else
2577                 sd_first_printk(KERN_ERR, sdkp,
2578                                 "Asking for cache data failed\n");
2579
2580 defaults:
2581         if (sdp->wce_default_on) {
2582                 sd_first_printk(KERN_NOTICE, sdkp,
2583                                 "Assuming drive cache: write back\n");
2584                 sdkp->WCE = 1;
2585         } else {
2586                 sd_first_printk(KERN_ERR, sdkp,
2587                                 "Assuming drive cache: write through\n");
2588                 sdkp->WCE = 0;
2589         }
2590         sdkp->RCD = 0;
2591         sdkp->DPOFUA = 0;
2592 }
2593
2594 /*
2595  * The ATO bit indicates whether the DIF application tag is available
2596  * for use by the operating system.
2597  */
2598 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2599 {
2600         int res, offset;
2601         struct scsi_device *sdp = sdkp->device;
2602         struct scsi_mode_data data;
2603         struct scsi_sense_hdr sshdr;
2604
2605         if (sdp->type != TYPE_DISK)
2606                 return;
2607
2608         if (sdkp->protection_type == 0)
2609                 return;
2610
2611         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2612                               SD_MAX_RETRIES, &data, &sshdr);
2613
2614         if (!scsi_status_is_good(res) || !data.header_length ||
2615             data.length < 6) {
2616                 sd_first_printk(KERN_WARNING, sdkp,
2617                           "getting Control mode page failed, assume no ATO\n");
2618
2619                 if (scsi_sense_valid(&sshdr))
2620                         sd_print_sense_hdr(sdkp, &sshdr);
2621
2622                 return;
2623         }
2624
2625         offset = data.header_length + data.block_descriptor_length;
2626
2627         if ((buffer[offset] & 0x3f) != 0x0a) {
2628                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2629                 return;
2630         }
2631
2632         if ((buffer[offset + 5] & 0x80) == 0)
2633                 return;
2634
2635         sdkp->ATO = 1;
2636
2637         return;
2638 }
2639
2640 /**
2641  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2642  * @disk: disk to query
2643  */
2644 static void sd_read_block_limits(struct scsi_disk *sdkp)
2645 {
2646         unsigned int sector_sz = sdkp->device->sector_size;
2647         const int vpd_len = 64;
2648         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2649
2650         if (!buffer ||
2651             /* Block Limits VPD */
2652             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2653                 goto out;
2654
2655         blk_queue_io_min(sdkp->disk->queue,
2656                          get_unaligned_be16(&buffer[6]) * sector_sz);
2657
2658         sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2659         sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2660
2661         if (buffer[3] == 0x3c) {
2662                 unsigned int lba_count, desc_count;
2663
2664                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2665
2666                 if (!sdkp->lbpme)
2667                         goto out;
2668
2669                 lba_count = get_unaligned_be32(&buffer[20]);
2670                 desc_count = get_unaligned_be32(&buffer[24]);
2671
2672                 if (lba_count && desc_count)
2673                         sdkp->max_unmap_blocks = lba_count;
2674
2675                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2676
2677                 if (buffer[32] & 0x80)
2678                         sdkp->unmap_alignment =
2679                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2680
2681                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2682
2683                         if (sdkp->max_unmap_blocks)
2684                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2685                         else
2686                                 sd_config_discard(sdkp, SD_LBP_WS16);
2687
2688                 } else {        /* LBP VPD page tells us what to use */
2689                         if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
2690                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2691                         else if (sdkp->lbpws)
2692                                 sd_config_discard(sdkp, SD_LBP_WS16);
2693                         else if (sdkp->lbpws10)
2694                                 sd_config_discard(sdkp, SD_LBP_WS10);
2695                         else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2696                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2697                         else
2698                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2699                 }
2700         }
2701
2702  out:
2703         kfree(buffer);
2704 }
2705
2706 /**
2707  * sd_read_block_characteristics - Query block dev. characteristics
2708  * @disk: disk to query
2709  */
2710 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2711 {
2712         unsigned char *buffer;
2713         u16 rot;
2714         const int vpd_len = 64;
2715
2716         buffer = kmalloc(vpd_len, GFP_KERNEL);
2717
2718         if (!buffer ||
2719             /* Block Device Characteristics VPD */
2720             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2721                 goto out;
2722
2723         rot = get_unaligned_be16(&buffer[4]);
2724
2725         if (rot == 1) {
2726                 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2727                 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue);
2728         }
2729
2730  out:
2731         kfree(buffer);
2732 }
2733
2734 /**
2735  * sd_read_block_provisioning - Query provisioning VPD page
2736  * @disk: disk to query
2737  */
2738 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2739 {
2740         unsigned char *buffer;
2741         const int vpd_len = 8;
2742
2743         if (sdkp->lbpme == 0)
2744                 return;
2745
2746         buffer = kmalloc(vpd_len, GFP_KERNEL);
2747
2748         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2749                 goto out;
2750
2751         sdkp->lbpvpd    = 1;
2752         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2753         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2754         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2755
2756  out:
2757         kfree(buffer);
2758 }
2759
2760 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2761 {
2762         struct scsi_device *sdev = sdkp->device;
2763
2764         if (sdev->host->no_write_same) {
2765                 sdev->no_write_same = 1;
2766
2767                 return;
2768         }
2769
2770         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2771                 /* too large values might cause issues with arcmsr */
2772                 int vpd_buf_len = 64;
2773
2774                 sdev->no_report_opcodes = 1;
2775
2776                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2777                  * CODES is unsupported and the device has an ATA
2778                  * Information VPD page (SAT).
2779                  */
2780                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
2781                         sdev->no_write_same = 1;
2782         }
2783
2784         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2785                 sdkp->ws16 = 1;
2786
2787         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2788                 sdkp->ws10 = 1;
2789 }
2790
2791 /**
2792  *      sd_revalidate_disk - called the first time a new disk is seen,
2793  *      performs disk spin up, read_capacity, etc.
2794  *      @disk: struct gendisk we care about
2795  **/
2796 static int sd_revalidate_disk(struct gendisk *disk)
2797 {
2798         struct scsi_disk *sdkp = scsi_disk(disk);
2799         struct scsi_device *sdp = sdkp->device;
2800         struct request_queue *q = sdkp->disk->queue;
2801         unsigned char *buffer;
2802         unsigned int dev_max, rw_max;
2803
2804         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2805                                       "sd_revalidate_disk\n"));
2806
2807         /*
2808          * If the device is offline, don't try and read capacity or any
2809          * of the other niceties.
2810          */
2811         if (!scsi_device_online(sdp))
2812                 goto out;
2813
2814         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2815         if (!buffer) {
2816                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2817                           "allocation failure.\n");
2818                 goto out;
2819         }
2820
2821         sd_spinup_disk(sdkp);
2822
2823         /*
2824          * Without media there is no reason to ask; moreover, some devices
2825          * react badly if we do.
2826          */
2827         if (sdkp->media_present) {
2828                 sd_read_capacity(sdkp, buffer);
2829
2830                 if (scsi_device_supports_vpd(sdp)) {
2831                         sd_read_block_provisioning(sdkp);
2832                         sd_read_block_limits(sdkp);
2833                         sd_read_block_characteristics(sdkp);
2834                 }
2835
2836                 sd_read_write_protect_flag(sdkp, buffer);
2837                 sd_read_cache_type(sdkp, buffer);
2838                 sd_read_app_tag_own(sdkp, buffer);
2839                 sd_read_write_same(sdkp, buffer);
2840         }
2841
2842         sdkp->first_scan = 0;
2843
2844         /*
2845          * We now have all cache related info, determine how we deal
2846          * with flush requests.
2847          */
2848         sd_set_flush_flag(sdkp);
2849
2850         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
2851         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
2852
2853         /* Some devices report a maximum block count for READ/WRITE requests. */
2854         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
2855         q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
2856
2857         /*
2858          * Use the device's preferred I/O size for reads and writes
2859          * unless the reported value is unreasonably small, large, or
2860          * garbage.
2861          */
2862         if (sdkp->opt_xfer_blocks &&
2863             sdkp->opt_xfer_blocks <= dev_max &&
2864             sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
2865             sdkp->opt_xfer_blocks * sdp->sector_size >= PAGE_CACHE_SIZE)
2866                 rw_max = q->limits.io_opt =
2867                         sdkp->opt_xfer_blocks * sdp->sector_size;
2868         else
2869                 rw_max = BLK_DEF_MAX_SECTORS;
2870
2871         /* Combine with controller limits */
2872         q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
2873
2874         set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
2875         sd_config_write_same(sdkp);
2876         kfree(buffer);
2877
2878  out:
2879         return 0;
2880 }
2881
2882 /**
2883  *      sd_unlock_native_capacity - unlock native capacity
2884  *      @disk: struct gendisk to set capacity for
2885  *
2886  *      Block layer calls this function if it detects that partitions
2887  *      on @disk reach beyond the end of the device.  If the SCSI host
2888  *      implements ->unlock_native_capacity() method, it's invoked to
2889  *      give it a chance to adjust the device capacity.
2890  *
2891  *      CONTEXT:
2892  *      Defined by block layer.  Might sleep.
2893  */
2894 static void sd_unlock_native_capacity(struct gendisk *disk)
2895 {
2896         struct scsi_device *sdev = scsi_disk(disk)->device;
2897
2898         if (sdev->host->hostt->unlock_native_capacity)
2899                 sdev->host->hostt->unlock_native_capacity(sdev);
2900 }
2901
2902 /**
2903  *      sd_format_disk_name - format disk name
2904  *      @prefix: name prefix - ie. "sd" for SCSI disks
2905  *      @index: index of the disk to format name for
2906  *      @buf: output buffer
2907  *      @buflen: length of the output buffer
2908  *
2909  *      SCSI disk names starts at sda.  The 26th device is sdz and the
2910  *      27th is sdaa.  The last one for two lettered suffix is sdzz
2911  *      which is followed by sdaaa.
2912  *
2913  *      This is basically 26 base counting with one extra 'nil' entry
2914  *      at the beginning from the second digit on and can be
2915  *      determined using similar method as 26 base conversion with the
2916  *      index shifted -1 after each digit is computed.
2917  *
2918  *      CONTEXT:
2919  *      Don't care.
2920  *
2921  *      RETURNS:
2922  *      0 on success, -errno on failure.
2923  */
2924 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2925 {
2926         const int base = 'z' - 'a' + 1;
2927         char *begin = buf + strlen(prefix);
2928         char *end = buf + buflen;
2929         char *p;
2930         int unit;
2931
2932         p = end - 1;
2933         *p = '\0';
2934         unit = base;
2935         do {
2936                 if (p == begin)
2937                         return -EINVAL;
2938                 *--p = 'a' + (index % unit);
2939                 index = (index / unit) - 1;
2940         } while (index >= 0);
2941
2942         memmove(begin, p, end - p);
2943         memcpy(buf, prefix, strlen(prefix));
2944
2945         return 0;
2946 }
2947
2948 /*
2949  * The asynchronous part of sd_probe
2950  */
2951 static void sd_probe_async(void *data, async_cookie_t cookie)
2952 {
2953         struct scsi_disk *sdkp = data;
2954         struct scsi_device *sdp;
2955         struct gendisk *gd;
2956         u32 index;
2957         struct device *dev;
2958
2959         sdp = sdkp->device;
2960         gd = sdkp->disk;
2961         index = sdkp->index;
2962         dev = &sdp->sdev_gendev;
2963
2964         gd->major = sd_major((index & 0xf0) >> 4);
2965         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2966         gd->minors = SD_MINORS;
2967
2968         gd->fops = &sd_fops;
2969         gd->private_data = &sdkp->driver;
2970         gd->queue = sdkp->device->request_queue;
2971
2972         /* defaults, until the device tells us otherwise */
2973         sdp->sector_size = 512;
2974         sdkp->capacity = 0;
2975         sdkp->media_present = 1;
2976         sdkp->write_prot = 0;
2977         sdkp->cache_override = 0;
2978         sdkp->WCE = 0;
2979         sdkp->RCD = 0;
2980         sdkp->ATO = 0;
2981         sdkp->first_scan = 1;
2982         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2983
2984         sd_revalidate_disk(gd);
2985
2986         gd->driverfs_dev = &sdp->sdev_gendev;
2987         gd->flags = GENHD_FL_EXT_DEVT;
2988         if (sdp->removable) {
2989                 gd->flags |= GENHD_FL_REMOVABLE;
2990                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2991         }
2992
2993         blk_pm_runtime_init(sdp->request_queue, dev);
2994         add_disk(gd);
2995         if (sdkp->capacity)
2996                 sd_dif_config_host(sdkp);
2997
2998         sd_revalidate_disk(gd);
2999
3000         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3001                   sdp->removable ? "removable " : "");
3002         scsi_autopm_put_device(sdp);
3003         put_device(&sdkp->dev);
3004 }
3005
3006 /**
3007  *      sd_probe - called during driver initialization and whenever a
3008  *      new scsi device is attached to the system. It is called once
3009  *      for each scsi device (not just disks) present.
3010  *      @dev: pointer to device object
3011  *
3012  *      Returns 0 if successful (or not interested in this scsi device
3013  *      (e.g. scanner)); 1 when there is an error.
3014  *
3015  *      Note: this function is invoked from the scsi mid-level.
3016  *      This function sets up the mapping between a given
3017  *      <host,channel,id,lun> (found in sdp) and new device name
3018  *      (e.g. /dev/sda). More precisely it is the block device major
3019  *      and minor number that is chosen here.
3020  *
3021  *      Assume sd_probe is not re-entrant (for time being)
3022  *      Also think about sd_probe() and sd_remove() running coincidentally.
3023  **/
3024 static int sd_probe(struct device *dev)
3025 {
3026         struct scsi_device *sdp = to_scsi_device(dev);
3027         struct scsi_disk *sdkp;
3028         struct gendisk *gd;
3029         int index;
3030         int error;
3031
3032         scsi_autopm_get_device(sdp);
3033         error = -ENODEV;
3034         if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
3035                 goto out;
3036
3037         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3038                                         "sd_probe\n"));
3039
3040         error = -ENOMEM;
3041         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3042         if (!sdkp)
3043                 goto out;
3044
3045         gd = alloc_disk(SD_MINORS);
3046         if (!gd)
3047                 goto out_free;
3048
3049         do {
3050                 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3051                         goto out_put;
3052
3053                 spin_lock(&sd_index_lock);
3054                 error = ida_get_new(&sd_index_ida, &index);
3055                 spin_unlock(&sd_index_lock);
3056         } while (error == -EAGAIN);
3057
3058         if (error) {
3059                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3060                 goto out_put;
3061         }
3062
3063         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3064         if (error) {
3065                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3066                 goto out_free_index;
3067         }
3068
3069         sdkp->device = sdp;
3070         sdkp->driver = &sd_template;
3071         sdkp->disk = gd;
3072         sdkp->index = index;
3073         atomic_set(&sdkp->openers, 0);
3074         atomic_set(&sdkp->device->ioerr_cnt, 0);
3075
3076         if (!sdp->request_queue->rq_timeout) {
3077                 if (sdp->type != TYPE_MOD)
3078                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3079                 else
3080                         blk_queue_rq_timeout(sdp->request_queue,
3081                                              SD_MOD_TIMEOUT);
3082         }
3083
3084         device_initialize(&sdkp->dev);
3085         sdkp->dev.parent = dev;
3086         sdkp->dev.class = &sd_disk_class;
3087         dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3088
3089         error = device_add(&sdkp->dev);
3090         if (error)
3091                 goto out_free_index;
3092
3093         get_device(dev);
3094         dev_set_drvdata(dev, sdkp);
3095
3096         get_device(&sdkp->dev); /* prevent release before async_schedule */
3097         async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3098
3099         return 0;
3100
3101  out_free_index:
3102         spin_lock(&sd_index_lock);
3103         ida_remove(&sd_index_ida, index);
3104         spin_unlock(&sd_index_lock);
3105  out_put:
3106         put_disk(gd);
3107  out_free:
3108         kfree(sdkp);
3109  out:
3110         scsi_autopm_put_device(sdp);
3111         return error;
3112 }
3113
3114 /**
3115  *      sd_remove - called whenever a scsi disk (previously recognized by
3116  *      sd_probe) is detached from the system. It is called (potentially
3117  *      multiple times) during sd module unload.
3118  *      @sdp: pointer to mid level scsi device object
3119  *
3120  *      Note: this function is invoked from the scsi mid-level.
3121  *      This function potentially frees up a device name (e.g. /dev/sdc)
3122  *      that could be re-used by a subsequent sd_probe().
3123  *      This function is not called when the built-in sd driver is "exit-ed".
3124  **/
3125 static int sd_remove(struct device *dev)
3126 {
3127         struct scsi_disk *sdkp;
3128         dev_t devt;
3129
3130         sdkp = dev_get_drvdata(dev);
3131         devt = disk_devt(sdkp->disk);
3132         scsi_autopm_get_device(sdkp->device);
3133
3134         async_synchronize_full_domain(&scsi_sd_pm_domain);
3135         async_synchronize_full_domain(&scsi_sd_probe_domain);
3136         device_del(&sdkp->dev);
3137         del_gendisk(sdkp->disk);
3138         sd_shutdown(dev);
3139
3140         blk_register_region(devt, SD_MINORS, NULL,
3141                             sd_default_probe, NULL, NULL);
3142
3143         mutex_lock(&sd_ref_mutex);
3144         dev_set_drvdata(dev, NULL);
3145         put_device(&sdkp->dev);
3146         mutex_unlock(&sd_ref_mutex);
3147
3148         return 0;
3149 }
3150
3151 /**
3152  *      scsi_disk_release - Called to free the scsi_disk structure
3153  *      @dev: pointer to embedded class device
3154  *
3155  *      sd_ref_mutex must be held entering this routine.  Because it is
3156  *      called on last put, you should always use the scsi_disk_get()
3157  *      scsi_disk_put() helpers which manipulate the semaphore directly
3158  *      and never do a direct put_device.
3159  **/
3160 static void scsi_disk_release(struct device *dev)
3161 {
3162         struct scsi_disk *sdkp = to_scsi_disk(dev);
3163         struct gendisk *disk = sdkp->disk;
3164
3165         spin_lock(&sd_index_lock);
3166         ida_remove(&sd_index_ida, sdkp->index);
3167         spin_unlock(&sd_index_lock);
3168
3169         disk->private_data = NULL;
3170         put_disk(disk);
3171         put_device(&sdkp->device->sdev_gendev);
3172
3173         kfree(sdkp);
3174 }
3175
3176 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3177 {
3178         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3179         struct scsi_sense_hdr sshdr;
3180         struct scsi_device *sdp = sdkp->device;
3181         int res;
3182
3183         if (start)
3184                 cmd[4] |= 1;    /* START */
3185
3186         if (sdp->start_stop_pwr_cond)
3187                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3188
3189         if (!scsi_device_online(sdp))
3190                 return -ENODEV;
3191
3192         res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3193                                SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3194         if (res) {
3195                 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3196                 if (driver_byte(res) & DRIVER_SENSE)
3197                         sd_print_sense_hdr(sdkp, &sshdr);
3198                 if (scsi_sense_valid(&sshdr) &&
3199                         /* 0x3a is medium not present */
3200                         sshdr.asc == 0x3a)
3201                         res = 0;
3202         }
3203
3204         /* SCSI error codes must not go to the generic layer */
3205         if (res)
3206                 return -EIO;
3207
3208         return 0;
3209 }
3210
3211 /*
3212  * Send a SYNCHRONIZE CACHE instruction down to the device through
3213  * the normal SCSI command structure.  Wait for the command to
3214  * complete.
3215  */
3216 static void sd_shutdown(struct device *dev)
3217 {
3218         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3219
3220         if (!sdkp)
3221                 return;         /* this can happen */
3222
3223         if (pm_runtime_suspended(dev))
3224                 return;
3225
3226         if (sdkp->WCE && sdkp->media_present) {
3227                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3228                 sd_sync_cache(sdkp);
3229         }
3230
3231         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3232                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3233                 sd_start_stop_device(sdkp, 0);
3234         }
3235 }
3236
3237 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3238 {
3239         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3240         int ret = 0;
3241
3242         if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
3243                 return 0;
3244
3245         if (sdkp->WCE && sdkp->media_present) {
3246                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3247                 ret = sd_sync_cache(sdkp);
3248                 if (ret) {
3249                         /* ignore OFFLINE device */
3250                         if (ret == -ENODEV)
3251                                 ret = 0;
3252                         goto done;
3253                 }
3254         }
3255
3256         if (sdkp->device->manage_start_stop) {
3257                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3258                 /* an error is not worth aborting a system sleep */
3259                 ret = sd_start_stop_device(sdkp, 0);
3260                 if (ignore_stop_errors)
3261                         ret = 0;
3262         }
3263
3264 done:
3265         return ret;
3266 }
3267
3268 static int sd_suspend_system(struct device *dev)
3269 {
3270         return sd_suspend_common(dev, true);
3271 }
3272
3273 static int sd_suspend_runtime(struct device *dev)
3274 {
3275         return sd_suspend_common(dev, false);
3276 }
3277
3278 static int sd_resume(struct device *dev)
3279 {
3280         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3281
3282         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
3283                 return 0;
3284
3285         if (!sdkp->device->manage_start_stop)
3286                 return 0;
3287
3288         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3289         return sd_start_stop_device(sdkp, 1);
3290 }
3291
3292 /**
3293  *      init_sd - entry point for this driver (both when built in or when
3294  *      a module).
3295  *
3296  *      Note: this function registers this driver with the scsi mid-level.
3297  **/
3298 static int __init init_sd(void)
3299 {
3300         int majors = 0, i, err;
3301
3302         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3303
3304         for (i = 0; i < SD_MAJORS; i++) {
3305                 if (register_blkdev(sd_major(i), "sd") != 0)
3306                         continue;
3307                 majors++;
3308                 blk_register_region(sd_major(i), SD_MINORS, NULL,
3309                                     sd_default_probe, NULL, NULL);
3310         }
3311
3312         if (!majors)
3313                 return -ENODEV;
3314
3315         err = class_register(&sd_disk_class);
3316         if (err)
3317                 goto err_out;
3318
3319         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3320                                          0, 0, NULL);
3321         if (!sd_cdb_cache) {
3322                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3323                 err = -ENOMEM;
3324                 goto err_out_class;
3325         }
3326
3327         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3328         if (!sd_cdb_pool) {
3329                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3330                 err = -ENOMEM;
3331                 goto err_out_cache;
3332         }
3333
3334         err = scsi_register_driver(&sd_template.gendrv);
3335         if (err)
3336                 goto err_out_driver;
3337
3338         return 0;
3339
3340 err_out_driver:
3341         mempool_destroy(sd_cdb_pool);
3342
3343 err_out_cache:
3344         kmem_cache_destroy(sd_cdb_cache);
3345
3346 err_out_class:
3347         class_unregister(&sd_disk_class);
3348 err_out:
3349         for (i = 0; i < SD_MAJORS; i++)
3350                 unregister_blkdev(sd_major(i), "sd");
3351         return err;
3352 }
3353
3354 /**
3355  *      exit_sd - exit point for this driver (when it is a module).
3356  *
3357  *      Note: this function unregisters this driver from the scsi mid-level.
3358  **/
3359 static void __exit exit_sd(void)
3360 {
3361         int i;
3362
3363         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3364
3365         scsi_unregister_driver(&sd_template.gendrv);
3366         mempool_destroy(sd_cdb_pool);
3367         kmem_cache_destroy(sd_cdb_cache);
3368
3369         class_unregister(&sd_disk_class);
3370
3371         for (i = 0; i < SD_MAJORS; i++) {
3372                 blk_unregister_region(sd_major(i), SD_MINORS);
3373                 unregister_blkdev(sd_major(i), "sd");
3374         }
3375 }
3376
3377 module_init(init_sd);
3378 module_exit(exit_sd);
3379
3380 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3381                                struct scsi_sense_hdr *sshdr)
3382 {
3383         scsi_print_sense_hdr(sdkp->device,
3384                              sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3385 }
3386
3387 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3388                             int result)
3389 {
3390         const char *hb_string = scsi_hostbyte_string(result);
3391         const char *db_string = scsi_driverbyte_string(result);
3392
3393         if (hb_string || db_string)
3394                 sd_printk(KERN_INFO, sdkp,
3395                           "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3396                           hb_string ? hb_string : "invalid",
3397                           db_string ? db_string : "invalid");
3398         else
3399                 sd_printk(KERN_INFO, sdkp,
3400                           "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3401                           msg, host_byte(result), driver_byte(result));
3402 }
3403