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