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