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