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 <asm/uaccess.h>
  54 #include <asm/unaligned.h>
  55
  56 #include <scsi/scsi.h>
  57 #include <scsi/scsi_cmnd.h>
  58 #include <scsi/scsi_dbg.h>
  59 #include <scsi/scsi_device.h>
  60 #include <scsi/scsi_driver.h>
  61 #include <scsi/scsi_eh.h>
  62 #include <scsi/scsi_host.h>
  63 #include <scsi/scsi_ioctl.h>
  64 #include <scsi/scsicam.h>
  65
  66 #include "sd.h"
  67 #include "scsi_logging.h"
  68
  69 MODULE_AUTHOR("Eric Youngdale");
  70 MODULE_DESCRIPTION("SCSI disk (sd) driver");
  71 MODULE_LICENSE("GPL");
  72
  73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  89 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  90 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  91 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  92
  93 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
  94 #define SD_MINORS       16
  95 #else
  96 #define SD_MINORS       0
  97 #endif
  98
  99 static void sd_config_discard(struct scsi_disk *, unsigned int);
 100 static int  sd_revalidate_disk(struct gendisk *);
 101 static void sd_unlock_native_capacity(struct gendisk *disk);
 102 static int  sd_probe(struct device *);
 103 static int  sd_remove(struct device *);
 104 static void sd_shutdown(struct device *);
 105 static int sd_suspend(struct device *, pm_message_t state);
 106 static int sd_resume(struct device *);
 107 static void sd_rescan(struct device *);
 108 static int sd_done(struct scsi_cmnd *);
 109 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 110 static void scsi_disk_release(struct device *cdev);
 111 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 112 static void sd_print_result(struct scsi_disk *, int);
 113
 114 static DEFINE_SPINLOCK(sd_index_lock);
 115 static DEFINE_IDA(sd_index_ida);
 116
 117 /* This semaphore is used to mediate the 0->1 reference get in the
 118  * face of object destruction (i.e. we can't allow a get on an
 119  * object after last put) */
 120 static DEFINE_MUTEX(sd_ref_mutex);
 121
 122 static struct kmem_cache *sd_cdb_cache;
 123 static mempool_t *sd_cdb_pool;
 124
 125 static const char *sd_cache_types[] = {
 126         "write through", "none", "write back",
 127         "write back, no read (daft)"
 128 };
 129
 130 static ssize_t
 131 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
 132                     const char *buf, size_t count)
 133 {
 134         int i, ct = -1, rcd, wce, sp;
 135         struct scsi_disk *sdkp = to_scsi_disk(dev);
 136         struct scsi_device *sdp = sdkp->device;
 137         char buffer[64];
 138         char *buffer_data;
 139         struct scsi_mode_data data;
 140         struct scsi_sense_hdr sshdr;
 141         static const char temp[] = "temporary ";
 142         int len;
 143
 144         if (sdp->type != TYPE_DISK)
 145                 /* no cache control on RBC devices; theoretically they
 146                  * can do it, but there's probably so many exceptions
 147                  * it's not worth the risk */
 148                 return -EINVAL;
 149
 150         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 151                 buf += sizeof(temp) - 1;
 152                 sdkp->cache_override = 1;
 153         } else {
 154                 sdkp->cache_override = 0;
 155         }
 156
 157         for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
 158                 len = strlen(sd_cache_types[i]);
 159                 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
 160                     buf[len] == '\n') {
 161                         ct = i;
 162                         break;
 163                 }
 164         }
 165         if (ct < 0)
 166                 return -EINVAL;
 167         rcd = ct & 0x01 ? 1 : 0;
 168         wce = ct & 0x02 ? 1 : 0;
 169
 170         if (sdkp->cache_override) {
 171                 sdkp->WCE = wce;
 172                 sdkp->RCD = rcd;
 173                 return count;
 174         }
 175
 176         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 177                             SD_MAX_RETRIES, &data, NULL))
 178                 return -EINVAL;
 179         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 180                   data.block_descriptor_length);
 181         buffer_data = buffer + data.header_length +
 182                 data.block_descriptor_length;
 183         buffer_data[2] &= ~0x05;
 184         buffer_data[2] |= wce << 2 | rcd;
 185         sp = buffer_data[0] & 0x80 ? 1 : 0;
 186
 187         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 188                              SD_MAX_RETRIES, &data, &sshdr)) {
 189                 if (scsi_sense_valid(&sshdr))
 190                         sd_print_sense_hdr(sdkp, &sshdr);
 191                 return -EINVAL;
 192         }
 193         revalidate_disk(sdkp->disk);
 194         return count;
 195 }
 196
 197 static ssize_t
 198 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
 199                            const char *buf, size_t count)
 200 {
 201         struct scsi_disk *sdkp = to_scsi_disk(dev);
 202         struct scsi_device *sdp = sdkp->device;
 203
 204         if (!capable(CAP_SYS_ADMIN))
 205                 return -EACCES;
 206
 207         sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
 208
 209         return count;
 210 }
 211
 212 static ssize_t
 213 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
 214                        const char *buf, size_t count)
 215 {
 216         struct scsi_disk *sdkp = to_scsi_disk(dev);
 217         struct scsi_device *sdp = sdkp->device;
 218
 219         if (!capable(CAP_SYS_ADMIN))
 220                 return -EACCES;
 221
 222         if (sdp->type != TYPE_DISK)
 223                 return -EINVAL;
 224
 225         sdp->allow_restart = simple_strtoul(buf, NULL, 10);
 226
 227         return count;
 228 }
 229
 230 static ssize_t
 231 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
 232                    char *buf)
 233 {
 234         struct scsi_disk *sdkp = to_scsi_disk(dev);
 235         int ct = sdkp->RCD + 2*sdkp->WCE;
 236
 237         return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
 238 }
 239
 240 static ssize_t
 241 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
 242 {
 243         struct scsi_disk *sdkp = to_scsi_disk(dev);
 244
 245         return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
 246 }
 247
 248 static ssize_t
 249 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
 250                           char *buf)
 251 {
 252         struct scsi_disk *sdkp = to_scsi_disk(dev);
 253         struct scsi_device *sdp = sdkp->device;
 254
 255         return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
 256 }
 257
 258 static ssize_t
 259 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
 260                       char *buf)
 261 {
 262         struct scsi_disk *sdkp = to_scsi_disk(dev);
 263
 264         return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
 265 }
 266
 267 static ssize_t
 268 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
 269                         char *buf)
 270 {
 271         struct scsi_disk *sdkp = to_scsi_disk(dev);
 272
 273         return snprintf(buf, 20, "%u\n", sdkp->protection_type);
 274 }
 275
 276 static ssize_t
 277 sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
 278                         char *buf)
 279 {
 280         struct scsi_disk *sdkp = to_scsi_disk(dev);
 281         struct scsi_device *sdp = sdkp->device;
 282         unsigned int dif, dix;
 283
 284         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 285         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 286
 287         if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
 288                 dif = 0;
 289                 dix = 1;
 290         }
 291
 292         if (!dif && !dix)
 293                 return snprintf(buf, 20, "none\n");
 294
 295         return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
 296 }
 297
 298 static ssize_t
 299 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
 300                     char *buf)
 301 {
 302         struct scsi_disk *sdkp = to_scsi_disk(dev);
 303
 304         return snprintf(buf, 20, "%u\n", sdkp->ATO);
 305 }
 306
 307 static ssize_t
 308 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
 309                           char *buf)
 310 {
 311         struct scsi_disk *sdkp = to_scsi_disk(dev);
 312
 313         return snprintf(buf, 20, "%u\n", sdkp->lbpme);
 314 }
 315
 316 static const char *lbp_mode[] = {
 317         [SD_LBP_FULL]           = "full",
 318         [SD_LBP_UNMAP]          = "unmap",
 319         [SD_LBP_WS16]           = "writesame_16",
 320         [SD_LBP_WS10]           = "writesame_10",
 321         [SD_LBP_ZERO]           = "writesame_zero",
 322         [SD_LBP_DISABLE]        = "disabled",
 323 };
 324
 325 static ssize_t
 326 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
 327                           char *buf)
 328 {
 329         struct scsi_disk *sdkp = to_scsi_disk(dev);
 330
 331         return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 332 }
 333
 334 static ssize_t
 335 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
 336                            const char *buf, size_t count)
 337 {
 338         struct scsi_disk *sdkp = to_scsi_disk(dev);
 339         struct scsi_device *sdp = sdkp->device;
 340
 341         if (!capable(CAP_SYS_ADMIN))
 342                 return -EACCES;
 343
 344         if (sdp->type != TYPE_DISK)
 345                 return -EINVAL;
 346
 347         if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
 348                 sd_config_discard(sdkp, SD_LBP_UNMAP);
 349         else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
 350                 sd_config_discard(sdkp, SD_LBP_WS16);
 351         else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
 352                 sd_config_discard(sdkp, SD_LBP_WS10);
 353         else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
 354                 sd_config_discard(sdkp, SD_LBP_ZERO);
 355         else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
 356                 sd_config_discard(sdkp, SD_LBP_DISABLE);
 357         else
 358                 return -EINVAL;
 359
 360         return count;
 361 }
 362
 363 static struct device_attribute sd_disk_attrs[] = {
 364         __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
 365                sd_store_cache_type),
 366         __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
 367         __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
 368                sd_store_allow_restart),
 369         __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
 370                sd_store_manage_start_stop),
 371         __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
 372         __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
 373         __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
 374         __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
 375         __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
 376                sd_store_provisioning_mode),
 377         __ATTR_NULL,
 378 };
 379
 380 static struct class sd_disk_class = {
 381         .name           = "scsi_disk",
 382         .owner          = THIS_MODULE,
 383         .dev_release    = scsi_disk_release,
 384         .dev_attrs      = sd_disk_attrs,
 385 };
 386
 387 static struct scsi_driver sd_template = {
 388         .owner                  = THIS_MODULE,
 389         .gendrv = {
 390                 .name           = "sd",
 391                 .probe          = sd_probe,
 392                 .remove         = sd_remove,
 393                 .suspend        = sd_suspend,
 394                 .resume         = sd_resume,
 395                 .shutdown       = sd_shutdown,
 396         },
 397         .rescan                 = sd_rescan,
 398         .done                   = sd_done,
 399 };
 400
 401 /*
 402  * Device no to disk mapping:
 403  *
 404  *       major         disc2     disc  p1
 405  *   |............|.............|....|....| <- dev_t
 406  *    31        20 19          8 7  4 3  0
 407  *
 408  * Inside a major, we have 16k disks, however mapped non-
 409  * contiguously. The first 16 disks are for major0, the next
 410  * ones with major1, ... Disk 256 is for major0 again, disk 272
 411  * for major1, ...
 412  * As we stay compatible with our numbering scheme, we can reuse
 413  * the well-know SCSI majors 8, 65--71, 136--143.
 414  */
 415 static int sd_major(int major_idx)
 416 {
 417         switch (major_idx) {
 418         case 0:
 419                 return SCSI_DISK0_MAJOR;
 420         case 1 ... 7:
 421                 return SCSI_DISK1_MAJOR + major_idx - 1;
 422         case 8 ... 15:
 423                 return SCSI_DISK8_MAJOR + major_idx - 8;
 424         default:
 425                 BUG();
 426                 return 0;       /* shut up gcc */
 427         }
 428 }
 429
 430 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
 431 {
 432         struct scsi_disk *sdkp = NULL;
 433
 434         if (disk->private_data) {
 435                 sdkp = scsi_disk(disk);
 436                 if (scsi_device_get(sdkp->device) == 0)
 437                         get_device(&sdkp->dev);
 438                 else
 439                         sdkp = NULL;
 440         }
 441         return sdkp;
 442 }
 443
 444 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 445 {
 446         struct scsi_disk *sdkp;
 447
 448         mutex_lock(&sd_ref_mutex);
 449         sdkp = __scsi_disk_get(disk);
 450         mutex_unlock(&sd_ref_mutex);
 451         return sdkp;
 452 }
 453
 454 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
 455 {
 456         struct scsi_disk *sdkp;
 457
 458         mutex_lock(&sd_ref_mutex);
 459         sdkp = dev_get_drvdata(dev);
 460         if (sdkp)
 461                 sdkp = __scsi_disk_get(sdkp->disk);
 462         mutex_unlock(&sd_ref_mutex);
 463         return sdkp;
 464 }
 465
 466 static void scsi_disk_put(struct scsi_disk *sdkp)
 467 {
 468         struct scsi_device *sdev = sdkp->device;
 469
 470         mutex_lock(&sd_ref_mutex);
 471         put_device(&sdkp->dev);
 472         scsi_device_put(sdev);
 473         mutex_unlock(&sd_ref_mutex);
 474 }
 475
 476 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
 477 {
 478         unsigned int prot_op = SCSI_PROT_NORMAL;
 479         unsigned int dix = scsi_prot_sg_count(scmd);
 480
 481         if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
 482                 if (dif && dix)
 483                         prot_op = SCSI_PROT_READ_PASS;
 484                 else if (dif && !dix)
 485                         prot_op = SCSI_PROT_READ_STRIP;
 486                 else if (!dif && dix)
 487                         prot_op = SCSI_PROT_READ_INSERT;
 488         } else {
 489                 if (dif && dix)
 490                         prot_op = SCSI_PROT_WRITE_PASS;
 491                 else if (dif && !dix)
 492                         prot_op = SCSI_PROT_WRITE_INSERT;
 493                 else if (!dif && dix)
 494                         prot_op = SCSI_PROT_WRITE_STRIP;
 495         }
 496
 497         scsi_set_prot_op(scmd, prot_op);
 498         scsi_set_prot_type(scmd, dif);
 499 }
 500
 501 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 502 {
 503         struct request_queue *q = sdkp->disk->queue;
 504         unsigned int logical_block_size = sdkp->device->sector_size;
 505         unsigned int max_blocks = 0;
 506
 507         q->limits.discard_zeroes_data = sdkp->lbprz;
 508         q->limits.discard_alignment = sdkp->unmap_alignment *
 509                 logical_block_size;
 510         q->limits.discard_granularity =
 511                 max(sdkp->physical_block_size,
 512                     sdkp->unmap_granularity * logical_block_size);
 513
 514         switch (mode) {
 515
 516         case SD_LBP_DISABLE:
 517                 q->limits.max_discard_sectors = 0;
 518                 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
 519                 return;
 520
 521         case SD_LBP_UNMAP:
 522                 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
 523                 break;
 524
 525         case SD_LBP_WS16:
 526                 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
 527                 break;
 528
 529         case SD_LBP_WS10:
 530                 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
 531                 break;
 532
 533         case SD_LBP_ZERO:
 534                 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
 535                 q->limits.discard_zeroes_data = 1;
 536                 break;
 537         }
 538
 539         q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
 540         queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
 541
 542         sdkp->provisioning_mode = mode;
 543 }
 544
 545 /**
 546  * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
 547  * @sdp: scsi device to operate one
 548  * @rq: Request to prepare
 549  *
 550  * Will issue either UNMAP or WRITE SAME(16) depending on preference
 551  * indicated by target device.
 552  **/
 553 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
 554 {
 555         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 556         struct bio *bio = rq->bio;
 557         sector_t sector = bio->bi_sector;
 558         unsigned int nr_sectors = bio_sectors(bio);
 559         unsigned int len;
 560         int ret;
 561         char *buf;
 562         struct page *page;
 563
 564         if (sdkp->device->sector_size == 4096) {
 565                 sector >>= 3;
 566                 nr_sectors >>= 3;
 567         }
 568
 569         rq->timeout = SD_TIMEOUT;
 570
 571         memset(rq->cmd, 0, rq->cmd_len);
 572
 573         page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 574         if (!page)
 575                 return BLKPREP_DEFER;
 576
 577         switch (sdkp->provisioning_mode) {
 578         case SD_LBP_UNMAP:
 579                 buf = page_address(page);
 580
 581                 rq->cmd_len = 10;
 582                 rq->cmd[0] = UNMAP;
 583                 rq->cmd[8] = 24;
 584
 585                 put_unaligned_be16(6 + 16, &buf[0]);
 586                 put_unaligned_be16(16, &buf[2]);
 587                 put_unaligned_be64(sector, &buf[8]);
 588                 put_unaligned_be32(nr_sectors, &buf[16]);
 589
 590                 len = 24;
 591                 break;
 592
 593         case SD_LBP_WS16:
 594                 rq->cmd_len = 16;
 595                 rq->cmd[0] = WRITE_SAME_16;
 596                 rq->cmd[1] = 0x8; /* UNMAP */
 597                 put_unaligned_be64(sector, &rq->cmd[2]);
 598                 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
 599
 600                 len = sdkp->device->sector_size;
 601                 break;
 602
 603         case SD_LBP_WS10:
 604         case SD_LBP_ZERO:
 605                 rq->cmd_len = 10;
 606                 rq->cmd[0] = WRITE_SAME;
 607                 if (sdkp->provisioning_mode == SD_LBP_WS10)
 608                         rq->cmd[1] = 0x8; /* UNMAP */
 609                 put_unaligned_be32(sector, &rq->cmd[2]);
 610                 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
 611
 612                 len = sdkp->device->sector_size;
 613                 break;
 614
 615         default:
 616                 ret = BLKPREP_KILL;
 617                 goto out;
 618         }
 619
 620         blk_add_request_payload(rq, page, len);
 621         ret = scsi_setup_blk_pc_cmnd(sdp, rq);
 622         rq->buffer = page_address(page);
 623
 624 out:
 625         if (ret != BLKPREP_OK) {
 626                 __free_page(page);
 627                 rq->buffer = NULL;
 628         }
 629         return ret;
 630 }
 631
 632 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
 633 {
 634         rq->timeout = SD_FLUSH_TIMEOUT;
 635         rq->retries = SD_MAX_RETRIES;
 636         rq->cmd[0] = SYNCHRONIZE_CACHE;
 637         rq->cmd_len = 10;
 638
 639         return scsi_setup_blk_pc_cmnd(sdp, rq);
 640 }
 641
 642 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
 643 {
 644         struct scsi_cmnd *SCpnt = rq->special;
 645
 646         if (rq->cmd_flags & REQ_DISCARD) {
 647                 free_page((unsigned long)rq->buffer);
 648                 rq->buffer = NULL;
 649         }
 650         if (SCpnt->cmnd != rq->cmd) {
 651                 mempool_free(SCpnt->cmnd, sd_cdb_pool);
 652                 SCpnt->cmnd = NULL;
 653                 SCpnt->cmd_len = 0;
 654         }
 655 }
 656
 657 /**
 658  *      sd_init_command - build a scsi (read or write) command from
 659  *      information in the request structure.
 660  *      @SCpnt: pointer to mid-level's per scsi command structure that
 661  *      contains request and into which the scsi command is written
 662  *
 663  *      Returns 1 if successful and 0 if error (or cannot be done now).
 664  **/
 665 static int sd_prep_fn(struct request_queue *q, struct request *rq)
 666 {
 667         struct scsi_cmnd *SCpnt;
 668         struct scsi_device *sdp = q->queuedata;
 669         struct gendisk *disk = rq->rq_disk;
 670         struct scsi_disk *sdkp;
 671         sector_t block = blk_rq_pos(rq);
 672         sector_t threshold;
 673         unsigned int this_count = blk_rq_sectors(rq);
 674         int ret, host_dif;
 675         unsigned char protect;
 676
 677         /*
 678          * Discard request come in as REQ_TYPE_FS but we turn them into
 679          * block PC requests to make life easier.
 680          */
 681         if (rq->cmd_flags & REQ_DISCARD) {
 682                 ret = scsi_setup_discard_cmnd(sdp, rq);
 683                 goto out;
 684         } else if (rq->cmd_flags & REQ_FLUSH) {
 685                 ret = scsi_setup_flush_cmnd(sdp, rq);
 686                 goto out;
 687         } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
 688                 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
 689                 goto out;
 690         } else if (rq->cmd_type != REQ_TYPE_FS) {
 691                 ret = BLKPREP_KILL;
 692                 goto out;
 693         }
 694         ret = scsi_setup_fs_cmnd(sdp, rq);
 695         if (ret != BLKPREP_OK)
 696                 goto out;
 697         SCpnt = rq->special;
 698         sdkp = scsi_disk(disk);
 699
 700         /* from here on until we're complete, any goto out
 701          * is used for a killable error condition */
 702         ret = BLKPREP_KILL;
 703
 704         SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
 705                                         "sd_init_command: block=%llu, "
 706                                         "count=%d\n",
 707                                         (unsigned long long)block,
 708                                         this_count));
 709
 710         if (!sdp || !scsi_device_online(sdp) ||
 711             block + blk_rq_sectors(rq) > get_capacity(disk)) {
 712                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
 713                                                 "Finishing %u sectors\n",
 714                                                 blk_rq_sectors(rq)));
 715                 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
 716                                                 "Retry with 0x%p\n", SCpnt));
 717                 goto out;
 718         }
 719
 720         if (sdp->changed) {
 721                 /*
 722                  * quietly refuse to do anything to a changed disc until
 723                  * the changed bit has been reset
 724                  */
 725                 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
 726                 goto out;
 727         }
 728
 729         /*
 730          * Some SD card readers can't handle multi-sector accesses which touch
 731          * the last one or two hardware sectors.  Split accesses as needed.
 732          */
 733         threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
 734                 (sdp->sector_size / 512);
 735
 736         if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
 737                 if (block < threshold) {
 738                         /* Access up to the threshold but not beyond */
 739                         this_count = threshold - block;
 740                 } else {
 741                         /* Access only a single hardware sector */
 742                         this_count = sdp->sector_size / 512;
 743                 }
 744         }
 745
 746         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
 747                                         (unsigned long long)block));
 748
 749         /*
 750          * If we have a 1K hardware sectorsize, prevent access to single
 751          * 512 byte sectors.  In theory we could handle this - in fact
 752          * the scsi cdrom driver must be able to handle this because
 753          * we typically use 1K blocksizes, and cdroms typically have
 754          * 2K hardware sectorsizes.  Of course, things are simpler
 755          * with the cdrom, since it is read-only.  For performance
 756          * reasons, the filesystems should be able to handle this
 757          * and not force the scsi disk driver to use bounce buffers
 758          * for this.
 759          */
 760         if (sdp->sector_size == 1024) {
 761                 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
 762                         scmd_printk(KERN_ERR, SCpnt,
 763                                     "Bad block number requested\n");
 764                         goto out;
 765                 } else {
 766                         block = block >> 1;
 767                         this_count = this_count >> 1;
 768                 }
 769         }
 770         if (sdp->sector_size == 2048) {
 771                 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
 772                         scmd_printk(KERN_ERR, SCpnt,
 773                                     "Bad block number requested\n");
 774                         goto out;
 775                 } else {
 776                         block = block >> 2;
 777                         this_count = this_count >> 2;
 778                 }
 779         }
 780         if (sdp->sector_size == 4096) {
 781                 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
 782                         scmd_printk(KERN_ERR, SCpnt,
 783                                     "Bad block number requested\n");
 784                         goto out;
 785                 } else {
 786                         block = block >> 3;
 787                         this_count = this_count >> 3;
 788                 }
 789         }
 790         if (rq_data_dir(rq) == WRITE) {
 791                 if (!sdp->writeable) {
 792                         goto out;
 793                 }
 794                 SCpnt->cmnd[0] = WRITE_6;
 795                 SCpnt->sc_data_direction = DMA_TO_DEVICE;
 796
 797                 if (blk_integrity_rq(rq) &&
 798                     sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
 799                         goto out;
 800
 801         } else if (rq_data_dir(rq) == READ) {
 802                 SCpnt->cmnd[0] = READ_6;
 803                 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
 804         } else {
 805                 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
 806                 goto out;
 807         }
 808
 809         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
 810                                         "%s %d/%u 512 byte blocks.\n",
 811                                         (rq_data_dir(rq) == WRITE) ?
 812                                         "writing" : "reading", this_count,
 813                                         blk_rq_sectors(rq)));
 814
 815         /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
 816         host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 817         if (host_dif)
 818                 protect = 1 << 5;
 819         else
 820                 protect = 0;
 821
 822         if (host_dif == SD_DIF_TYPE2_PROTECTION) {
 823                 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
 824
 825                 if (unlikely(SCpnt->cmnd == NULL)) {
 826                         ret = BLKPREP_DEFER;
 827                         goto out;
 828                 }
 829
 830                 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
 831                 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
 832                 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
 833                 SCpnt->cmnd[7] = 0x18;
 834                 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
 835                 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
 836
 837                 /* LBA */
 838                 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
 839                 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
 840                 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
 841                 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
 842                 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
 843                 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
 844                 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
 845                 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
 846
 847                 /* Expected Indirect LBA */
 848                 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
 849                 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
 850                 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
 851                 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
 852
 853                 /* Transfer length */
 854                 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
 855                 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
 856                 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
 857                 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
 858         } else if (block > 0xffffffff) {
 859                 SCpnt->cmnd[0] += READ_16 - READ_6;
 860                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
 861                 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
 862                 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
 863                 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
 864                 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
 865                 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
 866                 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
 867                 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
 868                 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
 869                 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
 870                 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
 871                 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
 872                 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
 873                 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
 874         } else if ((this_count > 0xff) || (block > 0x1fffff) ||
 875                    scsi_device_protection(SCpnt->device) ||
 876                    SCpnt->device->use_10_for_rw) {
 877                 if (this_count > 0xffff)
 878                         this_count = 0xffff;
 879
 880                 SCpnt->cmnd[0] += READ_10 - READ_6;
 881                 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
 882                 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
 883                 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
 884                 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
 885                 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
 886                 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
 887                 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
 888                 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
 889         } else {
 890                 if (unlikely(rq->cmd_flags & REQ_FUA)) {
 891                         /*
 892                          * This happens only if this drive failed
 893                          * 10byte rw command with ILLEGAL_REQUEST
 894                          * during operation and thus turned off
 895                          * use_10_for_rw.
 896                          */
 897                         scmd_printk(KERN_ERR, SCpnt,
 898                                     "FUA write on READ/WRITE(6) drive\n");
 899                         goto out;
 900                 }
 901
 902                 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
 903                 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
 904                 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
 905                 SCpnt->cmnd[4] = (unsigned char) this_count;
 906                 SCpnt->cmnd[5] = 0;
 907         }
 908         SCpnt->sdb.length = this_count * sdp->sector_size;
 909
 910         /* If DIF or DIX is enabled, tell HBA how to handle request */
 911         if (host_dif || scsi_prot_sg_count(SCpnt))
 912                 sd_prot_op(SCpnt, host_dif);
 913
 914         /*
 915          * We shouldn't disconnect in the middle of a sector, so with a dumb
 916          * host adapter, it's safe to assume that we can at least transfer
 917          * this many bytes between each connect / disconnect.
 918          */
 919         SCpnt->transfersize = sdp->sector_size;
 920         SCpnt->underflow = this_count << 9;
 921         SCpnt->allowed = SD_MAX_RETRIES;
 922
 923         /*
 924          * This indicates that the command is ready from our end to be
 925          * queued.
 926          */
 927         ret = BLKPREP_OK;
 928  out:
 929         return scsi_prep_return(q, rq, ret);
 930 }
 931
 932 /**
 933  *      sd_open - open a scsi disk device
 934  *      @inode: only i_rdev member may be used
 935  *      @filp: only f_mode and f_flags may be used
 936  *
 937  *      Returns 0 if successful. Returns a negated errno value in case
 938  *      of error.
 939  *
 940  *      Note: This can be called from a user context (e.g. fsck(1) )
 941  *      or from within the kernel (e.g. as a result of a mount(1) ).
 942  *      In the latter case @inode and @filp carry an abridged amount
 943  *      of information as noted above.
 944  *
 945  *      Locking: called with bdev->bd_mutex held.
 946  **/
 947 static int sd_open(struct block_device *bdev, fmode_t mode)
 948 {
 949         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
 950         struct scsi_device *sdev;
 951         int retval;
 952
 953         if (!sdkp)
 954                 return -ENXIO;
 955
 956         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
 957
 958         sdev = sdkp->device;
 959
 960         retval = scsi_autopm_get_device(sdev);
 961         if (retval)
 962                 goto error_autopm;
 963
 964         /*
 965          * If the device is in error recovery, wait until it is done.
 966          * If the device is offline, then disallow any access to it.
 967          */
 968         retval = -ENXIO;
 969         if (!scsi_block_when_processing_errors(sdev))
 970                 goto error_out;
 971
 972         if (sdev->removable || sdkp->write_prot)
 973                 check_disk_change(bdev);
 974
 975         /*
 976          * If the drive is empty, just let the open fail.
 977          */
 978         retval = -ENOMEDIUM;
 979         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
 980                 goto error_out;
 981
 982         /*
 983          * If the device has the write protect tab set, have the open fail
 984          * if the user expects to be able to write to the thing.
 985          */
 986         retval = -EROFS;
 987         if (sdkp->write_prot && (mode & FMODE_WRITE))
 988                 goto error_out;
 989
 990         /*
 991          * It is possible that the disk changing stuff resulted in
 992          * the device being taken offline.  If this is the case,
 993          * report this to the user, and don't pretend that the
 994          * open actually succeeded.
 995          */
 996         retval = -ENXIO;
 997         if (!scsi_device_online(sdev))
 998                 goto error_out;
 999
1000         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1001                 if (scsi_block_when_processing_errors(sdev))
1002                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1003         }
1004
1005         return 0;
1006
1007 error_out:
1008         scsi_autopm_put_device(sdev);
1009 error_autopm:
1010         scsi_disk_put(sdkp);
1011         return retval;
1012 }
1013
1014 /**
1015  *      sd_release - invoked when the (last) close(2) is called on this
1016  *      scsi disk.
1017  *      @inode: only i_rdev member may be used
1018  *      @filp: only f_mode and f_flags may be used
1019  *
1020  *      Returns 0.
1021  *
1022  *      Note: may block (uninterruptible) if error recovery is underway
1023  *      on this disk.
1024  *
1025  *      Locking: called with bdev->bd_mutex held.
1026  **/
1027 static int sd_release(struct gendisk *disk, fmode_t mode)
1028 {
1029         struct scsi_disk *sdkp = scsi_disk(disk);
1030         struct scsi_device *sdev = sdkp->device;
1031
1032         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1033
1034         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1035                 if (scsi_block_when_processing_errors(sdev))
1036                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1037         }
1038
1039         /*
1040          * XXX and what if there are packets in flight and this close()
1041          * XXX is followed by a "rmmod sd_mod"?
1042          */
1043
1044         scsi_autopm_put_device(sdev);
1045         scsi_disk_put(sdkp);
1046         return 0;
1047 }
1048
1049 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1050 {
1051         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1052         struct scsi_device *sdp = sdkp->device;
1053         struct Scsi_Host *host = sdp->host;
1054         int diskinfo[4];
1055
1056         /* default to most commonly used values */
1057         diskinfo[0] = 0x40;     /* 1 << 6 */
1058         diskinfo[1] = 0x20;     /* 1 << 5 */
1059         diskinfo[2] = sdkp->capacity >> 11;
1060
1061         /* override with calculated, extended default, or driver values */
1062         if (host->hostt->bios_param)
1063                 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1064         else
1065                 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1066
1067         geo->heads = diskinfo[0];
1068         geo->sectors = diskinfo[1];
1069         geo->cylinders = diskinfo[2];
1070         return 0;
1071 }
1072
1073 /**
1074  *      sd_ioctl - process an ioctl
1075  *      @inode: only i_rdev/i_bdev members may be used
1076  *      @filp: only f_mode and f_flags may be used
1077  *      @cmd: ioctl command number
1078  *      @arg: this is third argument given to ioctl(2) system call.
1079  *      Often contains a pointer.
1080  *
1081  *      Returns 0 if successful (some ioctls return positive numbers on
1082  *      success as well). Returns a negated errno value in case of error.
1083  *
1084  *      Note: most ioctls are forward onto the block subsystem or further
1085  *      down in the scsi subsystem.
1086  **/
1087 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1088                     unsigned int cmd, unsigned long arg)
1089 {
1090         struct gendisk *disk = bdev->bd_disk;
1091         struct scsi_disk *sdkp = scsi_disk(disk);
1092         struct scsi_device *sdp = sdkp->device;
1093         void __user *p = (void __user *)arg;
1094         int error;
1095
1096         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1097                                     "cmd=0x%x\n", disk->disk_name, cmd));
1098
1099         error = scsi_verify_blk_ioctl(bdev, cmd);
1100         if (error < 0)
1101                 return error;
1102
1103         /*
1104          * If we are in the middle of error recovery, don't let anyone
1105          * else try and use this device.  Also, if error recovery fails, it
1106          * may try and take the device offline, in which case all further
1107          * access to the device is prohibited.
1108          */
1109         error = scsi_nonblockable_ioctl(sdp, cmd, p,
1110                                         (mode & FMODE_NDELAY) != 0);
1111         if (!scsi_block_when_processing_errors(sdp) || !error)
1112                 goto out;
1113
1114         /*
1115          * Send SCSI addressing ioctls directly to mid level, send other
1116          * ioctls to block level and then onto mid level if they can't be
1117          * resolved.
1118          */
1119         switch (cmd) {
1120                 case SCSI_IOCTL_GET_IDLUN:
1121                 case SCSI_IOCTL_GET_BUS_NUMBER:
1122                         error = scsi_ioctl(sdp, cmd, p);
1123                         break;
1124                 default:
1125                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1126                         if (error != -ENOTTY)
1127                                 break;
1128                         error = scsi_ioctl(sdp, cmd, p);
1129                         break;
1130         }
1131 out:
1132         return error;
1133 }
1134
1135 static void set_media_not_present(struct scsi_disk *sdkp)
1136 {
1137         if (sdkp->media_present)
1138                 sdkp->device->changed = 1;
1139
1140         if (sdkp->device->removable) {
1141                 sdkp->media_present = 0;
1142                 sdkp->capacity = 0;
1143         }
1144 }
1145
1146 static int media_not_present(struct scsi_disk *sdkp,
1147                              struct scsi_sense_hdr *sshdr)
1148 {
1149         if (!scsi_sense_valid(sshdr))
1150                 return 0;
1151
1152         /* not invoked for commands that could return deferred errors */
1153         switch (sshdr->sense_key) {
1154         case UNIT_ATTENTION:
1155         case NOT_READY:
1156                 /* medium not present */
1157                 if (sshdr->asc == 0x3A) {
1158                         set_media_not_present(sdkp);
1159                         return 1;
1160                 }
1161         }
1162         return 0;
1163 }
1164
1165 /**
1166  *      sd_check_events - check media events
1167  *      @disk: kernel device descriptor
1168  *      @clearing: disk events currently being cleared
1169  *
1170  *      Returns mask of DISK_EVENT_*.
1171  *
1172  *      Note: this function is invoked from the block subsystem.
1173  **/
1174 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1175 {
1176         struct scsi_disk *sdkp = scsi_disk(disk);
1177         struct scsi_device *sdp = sdkp->device;
1178         struct scsi_sense_hdr *sshdr = NULL;
1179         int retval;
1180
1181         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1182
1183         /*
1184          * If the device is offline, don't send any commands - just pretend as
1185          * if the command failed.  If the device ever comes back online, we
1186          * can deal with it then.  It is only because of unrecoverable errors
1187          * that we would ever take a device offline in the first place.
1188          */
1189         if (!scsi_device_online(sdp)) {
1190                 set_media_not_present(sdkp);
1191                 goto out;
1192         }
1193
1194         /*
1195          * Using TEST_UNIT_READY enables differentiation between drive with
1196          * no cartridge loaded - NOT READY, drive with changed cartridge -
1197          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1198          *
1199          * Drives that auto spin down. eg iomega jaz 1G, will be started
1200          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1201          * sd_revalidate() is called.
1202          */
1203         retval = -ENODEV;
1204
1205         if (scsi_block_when_processing_errors(sdp)) {
1206                 sshdr  = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1207                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1208                                               sshdr);
1209         }
1210
1211         /* failed to execute TUR, assume media not present */
1212         if (host_byte(retval)) {
1213                 set_media_not_present(sdkp);
1214                 goto out;
1215         }
1216
1217         if (media_not_present(sdkp, sshdr))
1218                 goto out;
1219
1220         /*
1221          * For removable scsi disk we have to recognise the presence
1222          * of a disk in the drive.
1223          */
1224         if (!sdkp->media_present)
1225                 sdp->changed = 1;
1226         sdkp->media_present = 1;
1227 out:
1228         /*
1229          * sdp->changed is set under the following conditions:
1230          *
1231          *      Medium present state has changed in either direction.
1232          *      Device has indicated UNIT_ATTENTION.
1233          */
1234         kfree(sshdr);
1235         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1236         sdp->changed = 0;
1237         return retval;
1238 }
1239
1240 static int sd_sync_cache(struct scsi_disk *sdkp)
1241 {
1242         int retries, res;
1243         struct scsi_device *sdp = sdkp->device;
1244         struct scsi_sense_hdr sshdr;
1245
1246         if (!scsi_device_online(sdp))
1247                 return -ENODEV;
1248
1249
1250         for (retries = 3; retries > 0; --retries) {
1251                 unsigned char cmd[10] = { 0 };
1252
1253                 cmd[0] = SYNCHRONIZE_CACHE;
1254                 /*
1255                  * Leave the rest of the command zero to indicate
1256                  * flush everything.
1257                  */
1258                 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1259                                        SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1260                 if (res == 0)
1261                         break;
1262         }
1263
1264         if (res) {
1265                 sd_print_result(sdkp, res);
1266                 if (driver_byte(res) & DRIVER_SENSE)
1267                         sd_print_sense_hdr(sdkp, &sshdr);
1268         }
1269
1270         if (res)
1271                 return -EIO;
1272         return 0;
1273 }
1274
1275 static void sd_rescan(struct device *dev)
1276 {
1277         struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1278
1279         if (sdkp) {
1280                 revalidate_disk(sdkp->disk);
1281                 scsi_disk_put(sdkp);
1282         }
1283 }
1284
1285
1286 #ifdef CONFIG_COMPAT
1287 /*
1288  * This gets directly called from VFS. When the ioctl
1289  * is not recognized we go back to the other translation paths.
1290  */
1291 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1292                            unsigned int cmd, unsigned long arg)
1293 {
1294         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1295         int ret;
1296
1297         ret = scsi_verify_blk_ioctl(bdev, cmd);
1298         if (ret < 0)
1299                 return -ENOIOCTLCMD;
1300
1301         /*
1302          * If we are in the middle of error recovery, don't let anyone
1303          * else try and use this device.  Also, if error recovery fails, it
1304          * may try and take the device offline, in which case all further
1305          * access to the device is prohibited.
1306          */
1307         if (!scsi_block_when_processing_errors(sdev))
1308                 return -ENODEV;
1309
1310         if (sdev->host->hostt->compat_ioctl) {
1311                 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1312
1313                 return ret;
1314         }
1315
1316         /*
1317          * Let the static ioctl translation table take care of it.
1318          */
1319         return -ENOIOCTLCMD;
1320 }
1321 #endif
1322
1323 static const struct block_device_operations sd_fops = {
1324         .owner                  = THIS_MODULE,
1325         .open                   = sd_open,
1326         .release                = sd_release,
1327         .ioctl                  = sd_ioctl,
1328         .getgeo                 = sd_getgeo,
1329 #ifdef CONFIG_COMPAT
1330         .compat_ioctl           = sd_compat_ioctl,
1331 #endif
1332         .check_events           = sd_check_events,
1333         .revalidate_disk        = sd_revalidate_disk,
1334         .unlock_native_capacity = sd_unlock_native_capacity,
1335 };
1336
1337 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1338 {
1339         u64 start_lba = blk_rq_pos(scmd->request);
1340         u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1341         u64 factor = scmd->device->sector_size / 512;
1342         u64 bad_lba;
1343         int info_valid;
1344         /*
1345          * resid is optional but mostly filled in.  When it's unused,
1346          * its value is zero, so we assume the whole buffer transferred
1347          */
1348         unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1349         unsigned int good_bytes;
1350
1351         if (scmd->request->cmd_type != REQ_TYPE_FS)
1352                 return 0;
1353
1354         info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1355                                              SCSI_SENSE_BUFFERSIZE,
1356                                              &bad_lba);
1357         if (!info_valid)
1358                 return 0;
1359
1360         if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1361                 return 0;
1362
1363         /* be careful ... don't want any overflows */
1364         do_div(start_lba, factor);
1365         do_div(end_lba, factor);
1366
1367         /* The bad lba was reported incorrectly, we have no idea where
1368          * the error is.
1369          */
1370         if (bad_lba < start_lba  || bad_lba >= end_lba)
1371                 return 0;
1372
1373         /* This computation should always be done in terms of
1374          * the resolution of the device's medium.
1375          */
1376         good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1377         return min(good_bytes, transferred);
1378 }
1379
1380 /**
1381  *      sd_done - bottom half handler: called when the lower level
1382  *      driver has completed (successfully or otherwise) a scsi command.
1383  *      @SCpnt: mid-level's per command structure.
1384  *
1385  *      Note: potentially run from within an ISR. Must not block.
1386  **/
1387 static int sd_done(struct scsi_cmnd *SCpnt)
1388 {
1389         int result = SCpnt->result;
1390         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1391         struct scsi_sense_hdr sshdr;
1392         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1393         int sense_valid = 0;
1394         int sense_deferred = 0;
1395         unsigned char op = SCpnt->cmnd[0];
1396
1397         if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1398                 scsi_set_resid(SCpnt, 0);
1399
1400         if (result) {
1401                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1402                 if (sense_valid)
1403                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1404         }
1405 #ifdef CONFIG_SCSI_LOGGING
1406         SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1407         if (sense_valid) {
1408                 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1409                                                    "sd_done: sb[respc,sk,asc,"
1410                                                    "ascq]=%x,%x,%x,%x\n",
1411                                                    sshdr.response_code,
1412                                                    sshdr.sense_key, sshdr.asc,
1413                                                    sshdr.ascq));
1414         }
1415 #endif
1416         if (driver_byte(result) != DRIVER_SENSE &&
1417             (!sense_valid || sense_deferred))
1418                 goto out;
1419
1420         switch (sshdr.sense_key) {
1421         case HARDWARE_ERROR:
1422         case MEDIUM_ERROR:
1423                 good_bytes = sd_completed_bytes(SCpnt);
1424                 break;
1425         case RECOVERED_ERROR:
1426                 good_bytes = scsi_bufflen(SCpnt);
1427                 break;
1428         case NO_SENSE:
1429                 /* This indicates a false check condition, so ignore it.  An
1430                  * unknown amount of data was transferred so treat it as an
1431                  * error.
1432                  */
1433                 scsi_print_sense("sd", SCpnt);
1434                 SCpnt->result = 0;
1435                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1436                 break;
1437         case ABORTED_COMMAND:
1438                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
1439                         good_bytes = sd_completed_bytes(SCpnt);
1440                 break;
1441         case ILLEGAL_REQUEST:
1442                 if (sshdr.asc == 0x10)  /* DIX: Host detected corruption */
1443                         good_bytes = sd_completed_bytes(SCpnt);
1444                 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1445                 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1446                     (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1447                         sd_config_discard(sdkp, SD_LBP_DISABLE);
1448                 break;
1449         default:
1450                 break;
1451         }
1452  out:
1453         if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1454                 sd_dif_complete(SCpnt, good_bytes);
1455
1456         return good_bytes;
1457 }
1458
1459 /*
1460  * spinup disk - called only in sd_revalidate_disk()
1461  */
1462 static void
1463 sd_spinup_disk(struct scsi_disk *sdkp)
1464 {
1465         unsigned char cmd[10];
1466         unsigned long spintime_expire = 0;
1467         int retries, spintime;
1468         unsigned int the_result;
1469         struct scsi_sense_hdr sshdr;
1470         int sense_valid = 0;
1471
1472         spintime = 0;
1473
1474         /* Spin up drives, as required.  Only do this at boot time */
1475         /* Spinup needs to be done for module loads too. */
1476         do {
1477                 retries = 0;
1478
1479                 do {
1480                         cmd[0] = TEST_UNIT_READY;
1481                         memset((void *) &cmd[1], 0, 9);
1482
1483                         the_result = scsi_execute_req(sdkp->device, cmd,
1484                                                       DMA_NONE, NULL, 0,
1485                                                       &sshdr, SD_TIMEOUT,
1486                                                       SD_MAX_RETRIES, NULL);
1487
1488                         /*
1489                          * If the drive has indicated to us that it
1490                          * doesn't have any media in it, don't bother
1491                          * with any more polling.
1492                          */
1493                         if (media_not_present(sdkp, &sshdr))
1494                                 return;
1495
1496                         if (the_result)
1497                                 sense_valid = scsi_sense_valid(&sshdr);
1498                         retries++;
1499                 } while (retries < 3 &&
1500                          (!scsi_status_is_good(the_result) ||
1501                           ((driver_byte(the_result) & DRIVER_SENSE) &&
1502                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1503
1504                 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1505                         /* no sense, TUR either succeeded or failed
1506                          * with a status error */
1507                         if(!spintime && !scsi_status_is_good(the_result)) {
1508                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1509                                 sd_print_result(sdkp, the_result);
1510                         }
1511                         break;
1512                 }
1513
1514                 /*
1515                  * The device does not want the automatic start to be issued.
1516                  */
1517                 if (sdkp->device->no_start_on_add)
1518                         break;
1519
1520                 if (sense_valid && sshdr.sense_key == NOT_READY) {
1521                         if (sshdr.asc == 4 && sshdr.ascq == 3)
1522                                 break;  /* manual intervention required */
1523                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1524                                 break;  /* standby */
1525                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1526                                 break;  /* unavailable */
1527                         /*
1528                          * Issue command to spin up drive when not ready
1529                          */
1530                         if (!spintime) {
1531                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1532                                 cmd[0] = START_STOP;
1533                                 cmd[1] = 1;     /* Return immediately */
1534                                 memset((void *) &cmd[2], 0, 8);
1535                                 cmd[4] = 1;     /* Start spin cycle */
1536                                 if (sdkp->device->start_stop_pwr_cond)
1537                                         cmd[4] |= 1 << 4;
1538                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1539                                                  NULL, 0, &sshdr,
1540                                                  SD_TIMEOUT, SD_MAX_RETRIES,
1541                                                  NULL);
1542                                 spintime_expire = jiffies + 100 * HZ;
1543                                 spintime = 1;
1544                         }
1545                         /* Wait 1 second for next try */
1546                         msleep(1000);
1547                         printk(".");
1548
1549                 /*
1550                  * Wait for USB flash devices with slow firmware.
1551                  * Yes, this sense key/ASC combination shouldn't
1552                  * occur here.  It's characteristic of these devices.
1553                  */
1554                 } else if (sense_valid &&
1555                                 sshdr.sense_key == UNIT_ATTENTION &&
1556                                 sshdr.asc == 0x28) {
1557                         if (!spintime) {
1558                                 spintime_expire = jiffies + 5 * HZ;
1559                                 spintime = 1;
1560                         }
1561                         /* Wait 1 second for next try */
1562                         msleep(1000);
1563                 } else {
1564                         /* we don't understand the sense code, so it's
1565                          * probably pointless to loop */
1566                         if(!spintime) {
1567                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1568                                 sd_print_sense_hdr(sdkp, &sshdr);
1569                         }
1570                         break;
1571                 }
1572
1573         } while (spintime && time_before_eq(jiffies, spintime_expire));
1574
1575         if (spintime) {
1576                 if (scsi_status_is_good(the_result))
1577                         printk("ready\n");
1578                 else
1579                         printk("not responding...\n");
1580         }
1581 }
1582
1583
1584 /*
1585  * Determine whether disk supports Data Integrity Field.
1586  */
1587 static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1588 {
1589         struct scsi_device *sdp = sdkp->device;
1590         u8 type;
1591
1592         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1593                 return;
1594
1595         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1596
1597         if (type == sdkp->protection_type || !sdkp->first_scan)
1598                 return;
1599
1600         sdkp->protection_type = type;
1601
1602         if (type > SD_DIF_TYPE3_PROTECTION) {
1603                 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1604                           "protection type %u. Disabling disk!\n", type);
1605                 sdkp->capacity = 0;
1606                 return;
1607         }
1608
1609         if (scsi_host_dif_capable(sdp->host, type))
1610                 sd_printk(KERN_NOTICE, sdkp,
1611                           "Enabling DIF Type %u protection\n", type);
1612         else
1613                 sd_printk(KERN_NOTICE, sdkp,
1614                           "Disabling DIF Type %u protection\n", type);
1615 }
1616
1617 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1618                         struct scsi_sense_hdr *sshdr, int sense_valid,
1619                         int the_result)
1620 {
1621         sd_print_result(sdkp, the_result);
1622         if (driver_byte(the_result) & DRIVER_SENSE)
1623                 sd_print_sense_hdr(sdkp, sshdr);
1624         else
1625                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1626
1627         /*
1628          * Set dirty bit for removable devices if not ready -
1629          * sometimes drives will not report this properly.
1630          */
1631         if (sdp->removable &&
1632             sense_valid && sshdr->sense_key == NOT_READY)
1633                 set_media_not_present(sdkp);
1634
1635         /*
1636          * We used to set media_present to 0 here to indicate no media
1637          * in the drive, but some drives fail read capacity even with
1638          * media present, so we can't do that.
1639          */
1640         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1641 }
1642
1643 #define RC16_LEN 32
1644 #if RC16_LEN > SD_BUF_SIZE
1645 #error RC16_LEN must not be more than SD_BUF_SIZE
1646 #endif
1647
1648 #define READ_CAPACITY_RETRIES_ON_RESET  10
1649
1650 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1651                                                 unsigned char *buffer)
1652 {
1653         unsigned char cmd[16];
1654         struct scsi_sense_hdr sshdr;
1655         int sense_valid = 0;
1656         int the_result;
1657         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1658         unsigned int alignment;
1659         unsigned long long lba;
1660         unsigned sector_size;
1661
1662         if (sdp->no_read_capacity_16)
1663                 return -EINVAL;
1664
1665         do {
1666                 memset(cmd, 0, 16);
1667                 cmd[0] = SERVICE_ACTION_IN;
1668                 cmd[1] = SAI_READ_CAPACITY_16;
1669                 cmd[13] = RC16_LEN;
1670                 memset(buffer, 0, RC16_LEN);
1671
1672                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1673                                         buffer, RC16_LEN, &sshdr,
1674                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1675
1676                 if (media_not_present(sdkp, &sshdr))
1677                         return -ENODEV;
1678
1679                 if (the_result) {
1680                         sense_valid = scsi_sense_valid(&sshdr);
1681                         if (sense_valid &&
1682                             sshdr.sense_key == ILLEGAL_REQUEST &&
1683                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1684                             sshdr.ascq == 0x00)
1685                                 /* Invalid Command Operation Code or
1686                                  * Invalid Field in CDB, just retry
1687                                  * silently with RC10 */
1688                                 return -EINVAL;
1689                         if (sense_valid &&
1690                             sshdr.sense_key == UNIT_ATTENTION &&
1691                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1692                                 /* Device reset might occur several times,
1693                                  * give it one more chance */
1694                                 if (--reset_retries > 0)
1695                                         continue;
1696                 }
1697                 retries--;
1698
1699         } while (the_result && retries);
1700
1701         if (the_result) {
1702                 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1703                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1704                 return -EINVAL;
1705         }
1706
1707         sector_size = get_unaligned_be32(&buffer[8]);
1708         lba = get_unaligned_be64(&buffer[0]);
1709
1710         sd_read_protection_type(sdkp, buffer);
1711
1712         if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1713                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1714                         "kernel compiled with support for large block "
1715                         "devices.\n");
1716                 sdkp->capacity = 0;
1717                 return -EOVERFLOW;
1718         }
1719
1720         /* Logical blocks per physical block exponent */
1721         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1722
1723         /* Lowest aligned logical block */
1724         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1725         blk_queue_alignment_offset(sdp->request_queue, alignment);
1726         if (alignment && sdkp->first_scan)
1727                 sd_printk(KERN_NOTICE, sdkp,
1728                           "physical block alignment offset: %u\n", alignment);
1729
1730         if (buffer[14] & 0x80) { /* LBPME */
1731                 sdkp->lbpme = 1;
1732
1733                 if (buffer[14] & 0x40) /* LBPRZ */
1734                         sdkp->lbprz = 1;
1735
1736                 sd_config_discard(sdkp, SD_LBP_WS16);
1737         }
1738
1739         sdkp->capacity = lba + 1;
1740         return sector_size;
1741 }
1742
1743 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1744                                                 unsigned char *buffer)
1745 {
1746         unsigned char cmd[16];
1747         struct scsi_sense_hdr sshdr;
1748         int sense_valid = 0;
1749         int the_result;
1750         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1751         sector_t lba;
1752         unsigned sector_size;
1753
1754         do {
1755                 cmd[0] = READ_CAPACITY;
1756                 memset(&cmd[1], 0, 9);
1757                 memset(buffer, 0, 8);
1758
1759                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1760                                         buffer, 8, &sshdr,
1761                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1762
1763                 if (media_not_present(sdkp, &sshdr))
1764                         return -ENODEV;
1765
1766                 if (the_result) {
1767                         sense_valid = scsi_sense_valid(&sshdr);
1768                         if (sense_valid &&
1769                             sshdr.sense_key == UNIT_ATTENTION &&
1770                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1771                                 /* Device reset might occur several times,
1772                                  * give it one more chance */
1773                                 if (--reset_retries > 0)
1774                                         continue;
1775                 }
1776                 retries--;
1777
1778         } while (the_result && retries);
1779
1780         if (the_result) {
1781                 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1782                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1783                 return -EINVAL;
1784         }
1785
1786         sector_size = get_unaligned_be32(&buffer[4]);
1787         lba = get_unaligned_be32(&buffer[0]);
1788
1789         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1790                 /* Some buggy (usb cardreader) devices return an lba of
1791                    0xffffffff when the want to report a size of 0 (with
1792                    which they really mean no media is present) */
1793                 sdkp->capacity = 0;
1794                 sdkp->physical_block_size = sector_size;
1795                 return sector_size;
1796         }
1797
1798         if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1799                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1800                         "kernel compiled with support for large block "
1801                         "devices.\n");
1802                 sdkp->capacity = 0;
1803                 return -EOVERFLOW;
1804         }
1805
1806         sdkp->capacity = lba + 1;
1807         sdkp->physical_block_size = sector_size;
1808         return sector_size;
1809 }
1810
1811 static int sd_try_rc16_first(struct scsi_device *sdp)
1812 {
1813         if (sdp->host->max_cmd_len < 16)
1814                 return 0;
1815         if (sdp->scsi_level > SCSI_SPC_2)
1816                 return 1;
1817         if (scsi_device_protection(sdp))
1818                 return 1;
1819         return 0;
1820 }
1821
1822 /*
1823  * read disk capacity
1824  */
1825 static void
1826 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1827 {
1828         int sector_size;
1829         struct scsi_device *sdp = sdkp->device;
1830         sector_t old_capacity = sdkp->capacity;
1831
1832         if (sd_try_rc16_first(sdp)) {
1833                 sector_size = read_capacity_16(sdkp, sdp, buffer);
1834                 if (sector_size == -EOVERFLOW)
1835                         goto got_data;
1836                 if (sector_size == -ENODEV)
1837                         return;
1838                 if (sector_size < 0)
1839                         sector_size = read_capacity_10(sdkp, sdp, buffer);
1840                 if (sector_size < 0)
1841                         return;
1842         } else {
1843                 sector_size = read_capacity_10(sdkp, sdp, buffer);
1844                 if (sector_size == -EOVERFLOW)
1845                         goto got_data;
1846                 if (sector_size < 0)
1847                         return;
1848                 if ((sizeof(sdkp->capacity) > 4) &&
1849                     (sdkp->capacity > 0xffffffffULL)) {
1850                         int old_sector_size = sector_size;
1851                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1852                                         "Trying to use READ CAPACITY(16).\n");
1853                         sector_size = read_capacity_16(sdkp, sdp, buffer);
1854                         if (sector_size < 0) {
1855                                 sd_printk(KERN_NOTICE, sdkp,
1856                                         "Using 0xffffffff as device size\n");
1857                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1858                                 sector_size = old_sector_size;
1859                                 goto got_data;
1860                         }
1861                 }
1862         }
1863
1864         /* Some devices are known to return the total number of blocks,
1865          * not the highest block number.  Some devices have versions
1866          * which do this and others which do not.  Some devices we might
1867          * suspect of doing this but we don't know for certain.
1868          *
1869          * If we know the reported capacity is wrong, decrement it.  If
1870          * we can only guess, then assume the number of blocks is even
1871          * (usually true but not always) and err on the side of lowering
1872          * the capacity.
1873          */
1874         if (sdp->fix_capacity ||
1875             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1876                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1877                                 "from its reported value: %llu\n",
1878                                 (unsigned long long) sdkp->capacity);
1879                 --sdkp->capacity;
1880         }
1881
1882 got_data:
1883         if (sector_size == 0) {
1884                 sector_size = 512;
1885                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1886                           "assuming 512.\n");
1887         }
1888
1889         if (sector_size != 512 &&
1890             sector_size != 1024 &&
1891             sector_size != 2048 &&
1892             sector_size != 4096) {
1893                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1894                           sector_size);
1895                 /*
1896                  * The user might want to re-format the drive with
1897                  * a supported sectorsize.  Once this happens, it
1898                  * would be relatively trivial to set the thing up.
1899                  * For this reason, we leave the thing in the table.
1900                  */
1901                 sdkp->capacity = 0;
1902                 /*
1903                  * set a bogus sector size so the normal read/write
1904                  * logic in the block layer will eventually refuse any
1905                  * request on this device without tripping over power
1906                  * of two sector size assumptions
1907                  */
1908                 sector_size = 512;
1909         }
1910         blk_queue_logical_block_size(sdp->request_queue, sector_size);
1911
1912         {
1913                 char cap_str_2[10], cap_str_10[10];
1914                 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1915
1916                 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1917                                 sizeof(cap_str_2));
1918                 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1919                                 sizeof(cap_str_10));
1920
1921                 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1922                         sd_printk(KERN_NOTICE, sdkp,
1923                                   "%llu %d-byte logical blocks: (%s/%s)\n",
1924                                   (unsigned long long)sdkp->capacity,
1925                                   sector_size, cap_str_10, cap_str_2);
1926
1927                         if (sdkp->physical_block_size != sector_size)
1928                                 sd_printk(KERN_NOTICE, sdkp,
1929                                           "%u-byte physical blocks\n",
1930                                           sdkp->physical_block_size);
1931                 }
1932         }
1933
1934         /* Rescale capacity to 512-byte units */
1935         if (sector_size == 4096)
1936                 sdkp->capacity <<= 3;
1937         else if (sector_size == 2048)
1938                 sdkp->capacity <<= 2;
1939         else if (sector_size == 1024)
1940                 sdkp->capacity <<= 1;
1941
1942         blk_queue_physical_block_size(sdp->request_queue,
1943                                       sdkp->physical_block_size);
1944         sdkp->device->sector_size = sector_size;
1945 }
1946
1947 /* called with buffer of length 512 */
1948 static inline int
1949 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1950                  unsigned char *buffer, int len, struct scsi_mode_data *data,
1951                  struct scsi_sense_hdr *sshdr)
1952 {
1953         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1954                                SD_TIMEOUT, SD_MAX_RETRIES, data,
1955                                sshdr);
1956 }
1957
1958 /*
1959  * read write protect setting, if possible - called only in sd_revalidate_disk()
1960  * called with buffer of length SD_BUF_SIZE
1961  */
1962 static void
1963 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1964 {
1965         int res;
1966         struct scsi_device *sdp = sdkp->device;
1967         struct scsi_mode_data data;
1968         int old_wp = sdkp->write_prot;
1969
1970         set_disk_ro(sdkp->disk, 0);
1971         if (sdp->skip_ms_page_3f) {
1972                 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1973                 return;
1974         }
1975
1976         if (sdp->use_192_bytes_for_3f) {
1977                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1978         } else {
1979                 /*
1980                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
1981                  * We have to start carefully: some devices hang if we ask
1982                  * for more than is available.
1983                  */
1984                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1985
1986                 /*
1987                  * Second attempt: ask for page 0 When only page 0 is
1988                  * implemented, a request for page 3F may return Sense Key
1989                  * 5: Illegal Request, Sense Code 24: Invalid field in
1990                  * CDB.
1991                  */
1992                 if (!scsi_status_is_good(res))
1993                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1994
1995                 /*
1996                  * Third attempt: ask 255 bytes, as we did earlier.
1997                  */
1998                 if (!scsi_status_is_good(res))
1999                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2000                                                &data, NULL);
2001         }
2002
2003         if (!scsi_status_is_good(res)) {
2004                 sd_printk(KERN_WARNING, sdkp,
2005                           "Test WP failed, assume Write Enabled\n");
2006         } else {
2007                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2008                 set_disk_ro(sdkp->disk, sdkp->write_prot);
2009                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2010                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2011                                   sdkp->write_prot ? "on" : "off");
2012                         sd_printk(KERN_DEBUG, sdkp,
2013                                   "Mode Sense: %02x %02x %02x %02x\n",
2014                                   buffer[0], buffer[1], buffer[2], buffer[3]);
2015                 }
2016         }
2017 }
2018
2019 /*
2020  * sd_read_cache_type - called only from sd_revalidate_disk()
2021  * called with buffer of length SD_BUF_SIZE
2022  */
2023 static void
2024 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2025 {
2026         int len = 0, res;
2027         struct scsi_device *sdp = sdkp->device;
2028
2029         int dbd;
2030         int modepage;
2031         int first_len;
2032         struct scsi_mode_data data;
2033         struct scsi_sense_hdr sshdr;
2034         int old_wce = sdkp->WCE;
2035         int old_rcd = sdkp->RCD;
2036         int old_dpofua = sdkp->DPOFUA;
2037
2038
2039         if (sdkp->cache_override)
2040                 return;
2041
2042         first_len = 4;
2043         if (sdp->skip_ms_page_8) {
2044                 if (sdp->type == TYPE_RBC)
2045                         goto defaults;
2046                 else {
2047                         if (sdp->skip_ms_page_3f)
2048                                 goto defaults;
2049                         modepage = 0x3F;
2050                         if (sdp->use_192_bytes_for_3f)
2051                                 first_len = 192;
2052                         dbd = 0;
2053                 }
2054         } else if (sdp->type == TYPE_RBC) {
2055                 modepage = 6;
2056                 dbd = 8;
2057         } else {
2058                 modepage = 8;
2059                 dbd = 0;
2060         }
2061
2062         /* cautiously ask */
2063         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2064                         &data, &sshdr);
2065
2066         if (!scsi_status_is_good(res))
2067                 goto bad_sense;
2068
2069         if (!data.header_length) {
2070                 modepage = 6;
2071                 first_len = 0;
2072                 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2073         }
2074
2075         /* that went OK, now ask for the proper length */
2076         len = data.length;
2077
2078         /*
2079          * We're only interested in the first three bytes, actually.
2080          * But the data cache page is defined for the first 20.
2081          */
2082         if (len < 3)
2083                 goto bad_sense;
2084         else if (len > SD_BUF_SIZE) {
2085                 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2086                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2087                 len = SD_BUF_SIZE;
2088         }
2089         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2090                 len = 192;
2091
2092         /* Get the data */
2093         if (len > first_len)
2094                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2095                                 &data, &sshdr);
2096
2097         if (scsi_status_is_good(res)) {
2098                 int offset = data.header_length + data.block_descriptor_length;
2099
2100                 while (offset < len) {
2101                         u8 page_code = buffer[offset] & 0x3F;
2102                         u8 spf       = buffer[offset] & 0x40;
2103
2104                         if (page_code == 8 || page_code == 6) {
2105                                 /* We're interested only in the first 3 bytes.
2106                                  */
2107                                 if (len - offset <= 2) {
2108                                         sd_printk(KERN_ERR, sdkp, "Incomplete "
2109                                                   "mode parameter data\n");
2110                                         goto defaults;
2111                                 } else {
2112                                         modepage = page_code;
2113                                         goto Page_found;
2114                                 }
2115                         } else {
2116                                 /* Go to the next page */
2117                                 if (spf && len - offset > 3)
2118                                         offset += 4 + (buffer[offset+2] << 8) +
2119                                                 buffer[offset+3];
2120                                 else if (!spf && len - offset > 1)
2121                                         offset += 2 + buffer[offset+1];
2122                                 else {
2123                                         sd_printk(KERN_ERR, sdkp, "Incomplete "
2124                                                   "mode parameter data\n");
2125                                         goto defaults;
2126                                 }
2127                         }
2128                 }
2129
2130                 sd_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2131                 goto defaults;
2132
2133         Page_found:
2134                 if (modepage == 8) {
2135                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2136                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2137                 } else {
2138                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2139                         sdkp->RCD = 0;
2140                 }
2141
2142                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2143                 if (sdp->broken_fua) {
2144                         sd_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2145                         sdkp->DPOFUA = 0;
2146                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2147                         sd_printk(KERN_NOTICE, sdkp,
2148                                   "Uses READ/WRITE(6), disabling FUA\n");
2149                         sdkp->DPOFUA = 0;
2150                 }
2151
2152                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2153                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2154                         sd_printk(KERN_NOTICE, sdkp,
2155                                   "Write cache: %s, read cache: %s, %s\n",
2156                                   sdkp->WCE ? "enabled" : "disabled",
2157                                   sdkp->RCD ? "disabled" : "enabled",
2158                                   sdkp->DPOFUA ? "supports DPO and FUA"
2159                                   : "doesn't support DPO or FUA");
2160
2161                 return;
2162         }
2163
2164 bad_sense:
2165         if (scsi_sense_valid(&sshdr) &&
2166             sshdr.sense_key == ILLEGAL_REQUEST &&
2167             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2168                 /* Invalid field in CDB */
2169                 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2170         else
2171                 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2172
2173 defaults:
2174         sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2175         sdkp->WCE = 0;
2176         sdkp->RCD = 0;
2177         sdkp->DPOFUA = 0;
2178 }
2179
2180 /*
2181  * The ATO bit indicates whether the DIF application tag is available
2182  * for use by the operating system.
2183  */
2184 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2185 {
2186         int res, offset;
2187         struct scsi_device *sdp = sdkp->device;
2188         struct scsi_mode_data data;
2189         struct scsi_sense_hdr sshdr;
2190
2191         if (sdp->type != TYPE_DISK)
2192                 return;
2193
2194         if (sdkp->protection_type == 0)
2195                 return;
2196
2197         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2198                               SD_MAX_RETRIES, &data, &sshdr);
2199
2200         if (!scsi_status_is_good(res) || !data.header_length ||
2201             data.length < 6) {
2202                 sd_printk(KERN_WARNING, sdkp,
2203                           "getting Control mode page failed, assume no ATO\n");
2204
2205                 if (scsi_sense_valid(&sshdr))
2206                         sd_print_sense_hdr(sdkp, &sshdr);
2207
2208                 return;
2209         }
2210
2211         offset = data.header_length + data.block_descriptor_length;
2212
2213         if ((buffer[offset] & 0x3f) != 0x0a) {
2214                 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2215                 return;
2216         }
2217
2218         if ((buffer[offset + 5] & 0x80) == 0)
2219                 return;
2220
2221         sdkp->ATO = 1;
2222
2223         return;
2224 }
2225
2226 /**
2227  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2228  * @disk: disk to query
2229  */
2230 static void sd_read_block_limits(struct scsi_disk *sdkp)
2231 {
2232         unsigned int sector_sz = sdkp->device->sector_size;
2233         const int vpd_len = 64;
2234         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2235
2236         if (!buffer ||
2237             /* Block Limits VPD */
2238             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2239                 goto out;
2240
2241         blk_queue_io_min(sdkp->disk->queue,
2242                          get_unaligned_be16(&buffer[6]) * sector_sz);
2243         blk_queue_io_opt(sdkp->disk->queue,
2244                          get_unaligned_be32(&buffer[12]) * sector_sz);
2245
2246         if (buffer[3] == 0x3c) {
2247                 unsigned int lba_count, desc_count;
2248
2249                 sdkp->max_ws_blocks =
2250                         (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2251                                            (u64)0xffffffff);
2252
2253                 if (!sdkp->lbpme)
2254                         goto out;
2255
2256                 lba_count = get_unaligned_be32(&buffer[20]);
2257                 desc_count = get_unaligned_be32(&buffer[24]);
2258
2259                 if (lba_count && desc_count)
2260                         sdkp->max_unmap_blocks = lba_count;
2261
2262                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2263
2264                 if (buffer[32] & 0x80)
2265                         sdkp->unmap_alignment =
2266                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2267
2268                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2269
2270                         if (sdkp->max_unmap_blocks)
2271                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2272                         else
2273                                 sd_config_discard(sdkp, SD_LBP_WS16);
2274
2275                 } else {        /* LBP VPD page tells us what to use */
2276
2277                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2278                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2279                         else if (sdkp->lbpws)
2280                                 sd_config_discard(sdkp, SD_LBP_WS16);
2281                         else if (sdkp->lbpws10)
2282                                 sd_config_discard(sdkp, SD_LBP_WS10);
2283                         else
2284                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2285                 }
2286         }
2287
2288  out:
2289         kfree(buffer);
2290 }
2291
2292 /**
2293  * sd_read_block_characteristics - Query block dev. characteristics
2294  * @disk: disk to query
2295  */
2296 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2297 {
2298         unsigned char *buffer;
2299         u16 rot;
2300         const int vpd_len = 64;
2301
2302         buffer = kmalloc(vpd_len, GFP_KERNEL);
2303
2304         if (!buffer ||
2305             /* Block Device Characteristics VPD */
2306             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2307                 goto out;
2308
2309         rot = get_unaligned_be16(&buffer[4]);
2310
2311         if (rot == 1)
2312                 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2313
2314  out:
2315         kfree(buffer);
2316 }
2317
2318 /**
2319  * sd_read_block_provisioning - Query provisioning VPD page
2320  * @disk: disk to query
2321  */
2322 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2323 {
2324         unsigned char *buffer;
2325         const int vpd_len = 8;
2326
2327         if (sdkp->lbpme == 0)
2328                 return;
2329
2330         buffer = kmalloc(vpd_len, GFP_KERNEL);
2331
2332         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2333                 goto out;
2334
2335         sdkp->lbpvpd    = 1;
2336         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2337         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2338         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2339
2340  out:
2341         kfree(buffer);
2342 }
2343
2344 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2345 {
2346         /*
2347          * Although VPD inquiries can go to SCSI-2 type devices,
2348          * some USB ones crash on receiving them, and the pages
2349          * we currently ask for are for SPC-3 and beyond
2350          */
2351         if (sdp->scsi_level > SCSI_SPC_2)
2352                 return 1;
2353         return 0;
2354 }
2355
2356 /**
2357  *      sd_revalidate_disk - called the first time a new disk is seen,
2358  *      performs disk spin up, read_capacity, etc.
2359  *      @disk: struct gendisk we care about
2360  **/
2361 static int sd_revalidate_disk(struct gendisk *disk)
2362 {
2363         struct scsi_disk *sdkp = scsi_disk(disk);
2364         struct scsi_device *sdp = sdkp->device;
2365         unsigned char *buffer;
2366         unsigned flush = 0;
2367
2368         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2369                                       "sd_revalidate_disk\n"));
2370
2371         /*
2372          * If the device is offline, don't try and read capacity or any
2373          * of the other niceties.
2374          */
2375         if (!scsi_device_online(sdp))
2376                 goto out;
2377
2378         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2379         if (!buffer) {
2380                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2381                           "allocation failure.\n");
2382                 goto out;
2383         }
2384
2385         sd_spinup_disk(sdkp);
2386
2387         /*
2388          * Without media there is no reason to ask; moreover, some devices
2389          * react badly if we do.
2390          */
2391         if (sdkp->media_present) {
2392                 sd_read_capacity(sdkp, buffer);
2393
2394                 if (sd_try_extended_inquiry(sdp)) {
2395                         sd_read_block_provisioning(sdkp);
2396                         sd_read_block_limits(sdkp);
2397                         sd_read_block_characteristics(sdkp);
2398                 }
2399
2400                 sd_read_write_protect_flag(sdkp, buffer);
2401                 sd_read_cache_type(sdkp, buffer);
2402                 sd_read_app_tag_own(sdkp, buffer);
2403         }
2404
2405         sdkp->first_scan = 0;
2406
2407         /*
2408          * We now have all cache related info, determine how we deal
2409          * with flush requests.
2410          */
2411         if (sdkp->WCE) {
2412                 flush |= REQ_FLUSH;
2413                 if (sdkp->DPOFUA)
2414                         flush |= REQ_FUA;
2415         }
2416
2417         blk_queue_flush(sdkp->disk->queue, flush);
2418
2419         set_capacity(disk, sdkp->capacity);
2420         kfree(buffer);
2421
2422  out:
2423         return 0;
2424 }
2425
2426 /**
2427  *      sd_unlock_native_capacity - unlock native capacity
2428  *      @disk: struct gendisk to set capacity for
2429  *
2430  *      Block layer calls this function if it detects that partitions
2431  *      on @disk reach beyond the end of the device.  If the SCSI host
2432  *      implements ->unlock_native_capacity() method, it's invoked to
2433  *      give it a chance to adjust the device capacity.
2434  *
2435  *      CONTEXT:
2436  *      Defined by block layer.  Might sleep.
2437  */
2438 static void sd_unlock_native_capacity(struct gendisk *disk)
2439 {
2440         struct scsi_device *sdev = scsi_disk(disk)->device;
2441
2442         if (sdev->host->hostt->unlock_native_capacity)
2443                 sdev->host->hostt->unlock_native_capacity(sdev);
2444 }
2445
2446 /**
2447  *      sd_format_disk_name - format disk name
2448  *      @prefix: name prefix - ie. "sd" for SCSI disks
2449  *      @index: index of the disk to format name for
2450  *      @buf: output buffer
2451  *      @buflen: length of the output buffer
2452  *
2453  *      SCSI disk names starts at sda.  The 26th device is sdz and the
2454  *      27th is sdaa.  The last one for two lettered suffix is sdzz
2455  *      which is followed by sdaaa.
2456  *
2457  *      This is basically 26 base counting with one extra 'nil' entry
2458  *      at the beginning from the second digit on and can be
2459  *      determined using similar method as 26 base conversion with the
2460  *      index shifted -1 after each digit is computed.
2461  *
2462  *      CONTEXT:
2463  *      Don't care.
2464  *
2465  *      RETURNS:
2466  *      0 on success, -errno on failure.
2467  */
2468 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2469 {
2470         const int base = 'z' - 'a' + 1;
2471         char *begin = buf + strlen(prefix);
2472         char *end = buf + buflen;
2473         char *p;
2474         int unit;
2475
2476         p = end - 1;
2477         *p = '\0';
2478         unit = base;
2479         do {
2480                 if (p == begin)
2481                         return -EINVAL;
2482                 *--p = 'a' + (index % unit);
2483                 index = (index / unit) - 1;
2484         } while (index >= 0);
2485
2486         memmove(begin, p, end - p);
2487         memcpy(buf, prefix, strlen(prefix));
2488
2489         return 0;
2490 }
2491
2492 /*
2493  * The asynchronous part of sd_probe
2494  */
2495 static void sd_probe_async(void *data, async_cookie_t cookie)
2496 {
2497         struct scsi_disk *sdkp = data;
2498         struct scsi_device *sdp;
2499         struct gendisk *gd;
2500         u32 index;
2501         struct device *dev;
2502
2503         sdp = sdkp->device;
2504         gd = sdkp->disk;
2505         index = sdkp->index;
2506         dev = &sdp->sdev_gendev;
2507
2508         gd->major = sd_major((index & 0xf0) >> 4);
2509         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2510         gd->minors = SD_MINORS;
2511
2512         gd->fops = &sd_fops;
2513         gd->private_data = &sdkp->driver;
2514         gd->queue = sdkp->device->request_queue;
2515
2516         /* defaults, until the device tells us otherwise */
2517         sdp->sector_size = 512;
2518         sdkp->capacity = 0;
2519         sdkp->media_present = 1;
2520         sdkp->write_prot = 0;
2521         sdkp->cache_override = 0;
2522         sdkp->WCE = 0;
2523         sdkp->RCD = 0;
2524         sdkp->ATO = 0;
2525         sdkp->first_scan = 1;
2526
2527         sd_revalidate_disk(gd);
2528
2529         blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2530         blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2531
2532         gd->driverfs_dev = &sdp->sdev_gendev;
2533         gd->flags = GENHD_FL_EXT_DEVT;
2534         if (sdp->removable) {
2535                 gd->flags |= GENHD_FL_REMOVABLE;
2536                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2537         }
2538
2539         add_disk(gd);
2540         sd_dif_config_host(sdkp);
2541
2542         sd_revalidate_disk(gd);
2543
2544         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2545                   sdp->removable ? "removable " : "");
2546         scsi_autopm_put_device(sdp);
2547         put_device(&sdkp->dev);
2548 }
2549
2550 /**
2551  *      sd_probe - called during driver initialization and whenever a
2552  *      new scsi device is attached to the system. It is called once
2553  *      for each scsi device (not just disks) present.
2554  *      @dev: pointer to device object
2555  *
2556  *      Returns 0 if successful (or not interested in this scsi device
2557  *      (e.g. scanner)); 1 when there is an error.
2558  *
2559  *      Note: this function is invoked from the scsi mid-level.
2560  *      This function sets up the mapping between a given
2561  *      <host,channel,id,lun> (found in sdp) and new device name
2562  *      (e.g. /dev/sda). More precisely it is the block device major
2563  *      and minor number that is chosen here.
2564  *
2565  *      Assume sd_attach is not re-entrant (for time being)
2566  *      Also think about sd_attach() and sd_remove() running coincidentally.
2567  **/
2568 static int sd_probe(struct device *dev)
2569 {
2570         struct scsi_device *sdp = to_scsi_device(dev);
2571         struct scsi_disk *sdkp;
2572         struct gendisk *gd;
2573         int index;
2574         int error;
2575
2576         error = -ENODEV;
2577         if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2578                 goto out;
2579
2580         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2581                                         "sd_attach\n"));
2582
2583         error = -ENOMEM;
2584         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2585         if (!sdkp)
2586                 goto out;
2587
2588         gd = alloc_disk(SD_MINORS);
2589         if (!gd)
2590                 goto out_free;
2591
2592         do {
2593                 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2594                         goto out_put;
2595
2596                 spin_lock(&sd_index_lock);
2597                 error = ida_get_new(&sd_index_ida, &index);
2598                 spin_unlock(&sd_index_lock);
2599         } while (error == -EAGAIN);
2600
2601         if (error) {
2602                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2603                 goto out_put;
2604         }
2605
2606         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2607         if (error) {
2608                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2609                 goto out_free_index;
2610         }
2611
2612         sdkp->device = sdp;
2613         sdkp->driver = &sd_template;
2614         sdkp->disk = gd;
2615         sdkp->index = index;
2616         atomic_set(&sdkp->openers, 0);
2617
2618         if (!sdp->request_queue->rq_timeout) {
2619                 if (sdp->type != TYPE_MOD)
2620                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2621                 else
2622                         blk_queue_rq_timeout(sdp->request_queue,
2623                                              SD_MOD_TIMEOUT);
2624         }
2625
2626         device_initialize(&sdkp->dev);
2627         sdkp->dev.parent = dev;
2628         sdkp->dev.class = &sd_disk_class;
2629         dev_set_name(&sdkp->dev, dev_name(dev));
2630
2631         if (device_add(&sdkp->dev))
2632                 goto out_free_index;
2633
2634         get_device(dev);
2635         dev_set_drvdata(dev, sdkp);
2636
2637         get_device(&sdkp->dev); /* prevent release before async_schedule */
2638         async_schedule(sd_probe_async, sdkp);
2639
2640         return 0;
2641
2642  out_free_index:
2643         spin_lock(&sd_index_lock);
2644         ida_remove(&sd_index_ida, index);
2645         spin_unlock(&sd_index_lock);
2646  out_put:
2647         put_disk(gd);
2648  out_free:
2649         kfree(sdkp);
2650  out:
2651         return error;
2652 }
2653
2654 /**
2655  *      sd_remove - called whenever a scsi disk (previously recognized by
2656  *      sd_probe) is detached from the system. It is called (potentially
2657  *      multiple times) during sd module unload.
2658  *      @sdp: pointer to mid level scsi device object
2659  *
2660  *      Note: this function is invoked from the scsi mid-level.
2661  *      This function potentially frees up a device name (e.g. /dev/sdc)
2662  *      that could be re-used by a subsequent sd_probe().
2663  *      This function is not called when the built-in sd driver is "exit-ed".
2664  **/
2665 static int sd_remove(struct device *dev)
2666 {
2667         struct scsi_disk *sdkp;
2668
2669         sdkp = dev_get_drvdata(dev);
2670         scsi_autopm_get_device(sdkp->device);
2671
2672         async_synchronize_full();
2673         blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2674         blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2675         device_del(&sdkp->dev);
2676         del_gendisk(sdkp->disk);
2677         sd_shutdown(dev);
2678
2679         mutex_lock(&sd_ref_mutex);
2680         dev_set_drvdata(dev, NULL);
2681         put_device(&sdkp->dev);
2682         mutex_unlock(&sd_ref_mutex);
2683
2684         return 0;
2685 }
2686
2687 /**
2688  *      scsi_disk_release - Called to free the scsi_disk structure
2689  *      @dev: pointer to embedded class device
2690  *
2691  *      sd_ref_mutex must be held entering this routine.  Because it is
2692  *      called on last put, you should always use the scsi_disk_get()
2693  *      scsi_disk_put() helpers which manipulate the semaphore directly
2694  *      and never do a direct put_device.
2695  **/
2696 static void scsi_disk_release(struct device *dev)
2697 {
2698         struct scsi_disk *sdkp = to_scsi_disk(dev);
2699         struct gendisk *disk = sdkp->disk;
2700
2701         spin_lock(&sd_index_lock);
2702         ida_remove(&sd_index_ida, sdkp->index);
2703         spin_unlock(&sd_index_lock);
2704
2705         disk->private_data = NULL;
2706         put_disk(disk);
2707         put_device(&sdkp->device->sdev_gendev);
2708
2709         kfree(sdkp);
2710 }
2711
2712 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2713 {
2714         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
2715         struct scsi_sense_hdr sshdr;
2716         struct scsi_device *sdp = sdkp->device;
2717         int res;
2718
2719         if (start)
2720                 cmd[4] |= 1;    /* START */
2721
2722         if (sdp->start_stop_pwr_cond)
2723                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
2724
2725         if (!scsi_device_online(sdp))
2726                 return -ENODEV;
2727
2728         res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2729                                SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2730         if (res) {
2731                 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2732                 sd_print_result(sdkp, res);
2733                 if (driver_byte(res) & DRIVER_SENSE)
2734                         sd_print_sense_hdr(sdkp, &sshdr);
2735         }
2736
2737         return res;
2738 }
2739
2740 /*
2741  * Send a SYNCHRONIZE CACHE instruction down to the device through
2742  * the normal SCSI command structure.  Wait for the command to
2743  * complete.
2744  */
2745 static void sd_shutdown(struct device *dev)
2746 {
2747         struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2748
2749         if (!sdkp)
2750                 return;         /* this can happen */
2751
2752         if (sdkp->WCE) {
2753                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2754                 sd_sync_cache(sdkp);
2755         }
2756
2757         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2758                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2759                 sd_start_stop_device(sdkp, 0);
2760         }
2761
2762         scsi_disk_put(sdkp);
2763 }
2764
2765 static int sd_suspend(struct device *dev, pm_message_t mesg)
2766 {
2767         struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2768         int ret = 0;
2769
2770         if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
2771                 return 0;
2772
2773         if (sdkp->WCE) {
2774                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2775                 ret = sd_sync_cache(sdkp);
2776                 if (ret)
2777                         goto done;
2778         }
2779
2780         if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2781                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2782                 ret = sd_start_stop_device(sdkp, 0);
2783         }
2784
2785 done:
2786         scsi_disk_put(sdkp);
2787         return ret;
2788 }
2789
2790 static int sd_resume(struct device *dev)
2791 {
2792         struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2793         int ret = 0;
2794
2795         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
2796                 return 0;
2797
2798         if (!sdkp->device->manage_start_stop)
2799                 goto done;
2800
2801         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2802         ret = sd_start_stop_device(sdkp, 1);
2803
2804 done:
2805         scsi_disk_put(sdkp);
2806         return ret;
2807 }
2808
2809 /**
2810  *      init_sd - entry point for this driver (both when built in or when
2811  *      a module).
2812  *
2813  *      Note: this function registers this driver with the scsi mid-level.
2814  **/
2815 static int __init init_sd(void)
2816 {
2817         int majors = 0, i, err;
2818
2819         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2820
2821         for (i = 0; i < SD_MAJORS; i++)
2822                 if (register_blkdev(sd_major(i), "sd") == 0)
2823                         majors++;
2824
2825         if (!majors)
2826                 return -ENODEV;
2827
2828         err = class_register(&sd_disk_class);
2829         if (err)
2830                 goto err_out;
2831
2832         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2833                                          0, 0, NULL);
2834         if (!sd_cdb_cache) {
2835                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2836                 goto err_out_class;
2837         }
2838
2839         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2840         if (!sd_cdb_pool) {
2841                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2842                 goto err_out_cache;
2843         }
2844
2845         err = scsi_register_driver(&sd_template.gendrv);
2846         if (err)
2847                 goto err_out_driver;
2848
2849         return 0;
2850
2851 err_out_driver:
2852         mempool_destroy(sd_cdb_pool);
2853
2854 err_out_cache:
2855         kmem_cache_destroy(sd_cdb_cache);
2856
2857 err_out_class:
2858         class_unregister(&sd_disk_class);
2859 err_out:
2860         for (i = 0; i < SD_MAJORS; i++)
2861                 unregister_blkdev(sd_major(i), "sd");
2862         return err;
2863 }
2864
2865 /**
2866  *      exit_sd - exit point for this driver (when it is a module).
2867  *
2868  *      Note: this function unregisters this driver from the scsi mid-level.
2869  **/
2870 static void __exit exit_sd(void)
2871 {
2872         int i;
2873
2874         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2875
2876         scsi_unregister_driver(&sd_template.gendrv);
2877         mempool_destroy(sd_cdb_pool);
2878         kmem_cache_destroy(sd_cdb_cache);
2879
2880         class_unregister(&sd_disk_class);
2881
2882         for (i = 0; i < SD_MAJORS; i++)
2883                 unregister_blkdev(sd_major(i), "sd");
2884 }
2885
2886 module_init(init_sd);
2887 module_exit(exit_sd);
2888
2889 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2890                                struct scsi_sense_hdr *sshdr)
2891 {
2892         sd_printk(KERN_INFO, sdkp, " ");
2893         scsi_show_sense_hdr(sshdr);
2894         sd_printk(KERN_INFO, sdkp, " ");
2895         scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2896 }
2897
2898 static void sd_print_result(struct scsi_disk *sdkp, int result)
2899 {
2900         sd_printk(KERN_INFO, sdkp, " ");
2901         scsi_show_result(result);
2902 }
2903