linux/drivers/scsi/sd.c
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   1/*
   2 *      sd.c Copyright (C) 1992 Drew Eckhardt
   3 *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   4 *
   5 *      Linux scsi disk driver
   6 *              Initial versions: Drew Eckhardt
   7 *              Subsequent revisions: Eric Youngdale
   8 *      Modification history:
   9 *       - Drew Eckhardt <drew@colorado.edu> original
  10 *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 
  11 *         outstanding request, and other enhancements.
  12 *         Support loadable low-level scsi drivers.
  13 *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 
  14 *         eight major numbers.
  15 *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
  16 *       - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 
  17 *         sd_init and cleanups.
  18 *       - Alex Davis <letmein@erols.com> Fix problem where partition info
  19 *         not being read in sd_open. Fix problem where removable media 
  20 *         could be ejected after sd_open.
  21 *       - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
  22 *       - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 
  23 *         <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 
  24 *         Support 32k/1M disks.
  25 *
  26 *      Logging policy (needs CONFIG_SCSI_LOGGING defined):
  27 *       - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  28 *       - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  29 *       - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  30 *       - entering other commands: SCSI_LOG_HLQUEUE level 3
  31 *      Note: when the logging level is set by the user, it must be greater
  32 *      than the level indicated above to trigger output.       
  33 */
  34
  35#include <linux/module.h>
  36#include <linux/fs.h>
  37#include <linux/kernel.h>
  38#include <linux/mm.h>
  39#include <linux/bio.h>
  40#include <linux/genhd.h>
  41#include <linux/hdreg.h>
  42#include <linux/errno.h>
  43#include <linux/idr.h>
  44#include <linux/interrupt.h>
  45#include <linux/init.h>
  46#include <linux/blkdev.h>
  47#include <linux/blkpg.h>
  48#include <linux/delay.h>
  49#include <linux/mutex.h>
  50#include <linux/string_helpers.h>
  51#include <linux/async.h>
  52#include <linux/slab.h>
  53#include <linux/pm_runtime.h>
  54#include <asm/uaccess.h>
  55#include <asm/unaligned.h>
  56
  57#include <scsi/scsi.h>
  58#include <scsi/scsi_cmnd.h>
  59#include <scsi/scsi_dbg.h>
  60#include <scsi/scsi_device.h>
  61#include <scsi/scsi_driver.h>
  62#include <scsi/scsi_eh.h>
  63#include <scsi/scsi_host.h>
  64#include <scsi/scsi_ioctl.h>
  65#include <scsi/scsicam.h>
  66
  67#include "sd.h"
  68#include "scsi_priv.h"
  69#include "scsi_logging.h"
  70
  71MODULE_AUTHOR("Eric Youngdale");
  72MODULE_DESCRIPTION("SCSI disk (sd) driver");
  73MODULE_LICENSE("GPL");
  74
  75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  91MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  92MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  93MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  94
  95#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
  96#define SD_MINORS       16
  97#else
  98#define SD_MINORS       0
  99#endif
 100
 101static void sd_config_discard(struct scsi_disk *, unsigned int);
 102static void sd_config_write_same(struct scsi_disk *);
 103static int  sd_revalidate_disk(struct gendisk *);
 104static void sd_unlock_native_capacity(struct gendisk *disk);
 105static int  sd_probe(struct device *);
 106static int  sd_remove(struct device *);
 107static void sd_shutdown(struct device *);
 108static int sd_suspend(struct device *);
 109static int sd_resume(struct device *);
 110static void sd_rescan(struct device *);
 111static int sd_done(struct scsi_cmnd *);
 112static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
 113static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 114static void scsi_disk_release(struct device *cdev);
 115static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 116static void sd_print_result(struct scsi_disk *, int);
 117
 118static DEFINE_SPINLOCK(sd_index_lock);
 119static DEFINE_IDA(sd_index_ida);
 120
 121/* This semaphore is used to mediate the 0->1 reference get in the
 122 * face of object destruction (i.e. we can't allow a get on an
 123 * object after last put) */
 124static DEFINE_MUTEX(sd_ref_mutex);
 125
 126static struct kmem_cache *sd_cdb_cache;
 127static mempool_t *sd_cdb_pool;
 128
 129static const char *sd_cache_types[] = {
 130        "write through", "none", "write back",
 131        "write back, no read (daft)"
 132};
 133
 134static ssize_t
 135sd_store_cache_type(struct device *dev, struct device_attribute *attr,
 136                    const char *buf, size_t count)
 137{
 138        int i, ct = -1, rcd, wce, sp;
 139        struct scsi_disk *sdkp = to_scsi_disk(dev);
 140        struct scsi_device *sdp = sdkp->device;
 141        char buffer[64];
 142        char *buffer_data;
 143        struct scsi_mode_data data;
 144        struct scsi_sense_hdr sshdr;
 145        static const char temp[] = "temporary ";
 146        int len;
 147
 148        if (sdp->type != TYPE_DISK)
 149                /* no cache control on RBC devices; theoretically they
 150                 * can do it, but there's probably so many exceptions
 151                 * it's not worth the risk */
 152                return -EINVAL;
 153
 154        if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 155                buf += sizeof(temp) - 1;
 156                sdkp->cache_override = 1;
 157        } else {
 158                sdkp->cache_override = 0;
 159        }
 160
 161        for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
 162                len = strlen(sd_cache_types[i]);
 163                if (strncmp(sd_cache_types[i], buf, len) == 0 &&
 164                    buf[len] == '\n') {
 165                        ct = i;
 166                        break;
 167                }
 168        }
 169        if (ct < 0)
 170                return -EINVAL;
 171        rcd = ct & 0x01 ? 1 : 0;
 172        wce = ct & 0x02 ? 1 : 0;
 173
 174        if (sdkp->cache_override) {
 175                sdkp->WCE = wce;
 176                sdkp->RCD = rcd;
 177                return count;
 178        }
 179
 180        if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 181                            SD_MAX_RETRIES, &data, NULL))
 182                return -EINVAL;
 183        len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 184                  data.block_descriptor_length);
 185        buffer_data = buffer + data.header_length +
 186                data.block_descriptor_length;
 187        buffer_data[2] &= ~0x05;
 188        buffer_data[2] |= wce << 2 | rcd;
 189        sp = buffer_data[0] & 0x80 ? 1 : 0;
 190
 191        if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 192                             SD_MAX_RETRIES, &data, &sshdr)) {
 193                if (scsi_sense_valid(&sshdr))
 194                        sd_print_sense_hdr(sdkp, &sshdr);
 195                return -EINVAL;
 196        }
 197        revalidate_disk(sdkp->disk);
 198        return count;
 199}
 200
 201static ssize_t
 202sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
 203                           const char *buf, size_t count)
 204{
 205        struct scsi_disk *sdkp = to_scsi_disk(dev);
 206        struct scsi_device *sdp = sdkp->device;
 207
 208        if (!capable(CAP_SYS_ADMIN))
 209                return -EACCES;
 210
 211        sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
 212
 213        return count;
 214}
 215
 216static ssize_t
 217sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
 218                       const char *buf, size_t count)
 219{
 220        struct scsi_disk *sdkp = to_scsi_disk(dev);
 221        struct scsi_device *sdp = sdkp->device;
 222
 223        if (!capable(CAP_SYS_ADMIN))
 224                return -EACCES;
 225
 226        if (sdp->type != TYPE_DISK)
 227                return -EINVAL;
 228
 229        sdp->allow_restart = simple_strtoul(buf, NULL, 10);
 230
 231        return count;
 232}
 233
 234static ssize_t
 235sd_show_cache_type(struct device *dev, struct device_attribute *attr,
 236                   char *buf)
 237{
 238        struct scsi_disk *sdkp = to_scsi_disk(dev);
 239        int ct = sdkp->RCD + 2*sdkp->WCE;
 240
 241        return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
 242}
 243
 244static ssize_t
 245sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
 246{
 247        struct scsi_disk *sdkp = to_scsi_disk(dev);
 248
 249        return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
 250}
 251
 252static ssize_t
 253sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
 254                          char *buf)
 255{
 256        struct scsi_disk *sdkp = to_scsi_disk(dev);
 257        struct scsi_device *sdp = sdkp->device;
 258
 259        return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
 260}
 261
 262static ssize_t
 263sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
 264                      char *buf)
 265{
 266        struct scsi_disk *sdkp = to_scsi_disk(dev);
 267
 268        return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
 269}
 270
 271static ssize_t
 272sd_show_protection_type(struct device *dev, struct device_attribute *attr,
 273                        char *buf)
 274{
 275        struct scsi_disk *sdkp = to_scsi_disk(dev);
 276
 277        return snprintf(buf, 20, "%u\n", sdkp->protection_type);
 278}
 279
 280static ssize_t
 281sd_store_protection_type(struct device *dev, struct device_attribute *attr,
 282                         const char *buf, size_t count)
 283{
 284        struct scsi_disk *sdkp = to_scsi_disk(dev);
 285        unsigned int val;
 286        int err;
 287
 288        if (!capable(CAP_SYS_ADMIN))
 289                return -EACCES;
 290
 291        err = kstrtouint(buf, 10, &val);
 292
 293        if (err)
 294                return err;
 295
 296        if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
 297                sdkp->protection_type = val;
 298
 299        return count;
 300}
 301
 302static ssize_t
 303sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
 304                        char *buf)
 305{
 306        struct scsi_disk *sdkp = to_scsi_disk(dev);
 307        struct scsi_device *sdp = sdkp->device;
 308        unsigned int dif, dix;
 309
 310        dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 311        dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 312
 313        if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
 314                dif = 0;
 315                dix = 1;
 316        }
 317
 318        if (!dif && !dix)
 319                return snprintf(buf, 20, "none\n");
 320
 321        return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
 322}
 323
 324static ssize_t
 325sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
 326                    char *buf)
 327{
 328        struct scsi_disk *sdkp = to_scsi_disk(dev);
 329
 330        return snprintf(buf, 20, "%u\n", sdkp->ATO);
 331}
 332
 333static ssize_t
 334sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
 335                          char *buf)
 336{
 337        struct scsi_disk *sdkp = to_scsi_disk(dev);
 338
 339        return snprintf(buf, 20, "%u\n", sdkp->lbpme);
 340}
 341
 342static const char *lbp_mode[] = {
 343        [SD_LBP_FULL]           = "full",
 344        [SD_LBP_UNMAP]          = "unmap",
 345        [SD_LBP_WS16]           = "writesame_16",
 346        [SD_LBP_WS10]           = "writesame_10",
 347        [SD_LBP_ZERO]           = "writesame_zero",
 348        [SD_LBP_DISABLE]        = "disabled",
 349};
 350
 351static ssize_t
 352sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
 353                          char *buf)
 354{
 355        struct scsi_disk *sdkp = to_scsi_disk(dev);
 356
 357        return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 358}
 359
 360static ssize_t
 361sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
 362                           const char *buf, size_t count)
 363{
 364        struct scsi_disk *sdkp = to_scsi_disk(dev);
 365        struct scsi_device *sdp = sdkp->device;
 366
 367        if (!capable(CAP_SYS_ADMIN))
 368                return -EACCES;
 369
 370        if (sdp->type != TYPE_DISK)
 371                return -EINVAL;
 372
 373        if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
 374                sd_config_discard(sdkp, SD_LBP_UNMAP);
 375        else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
 376                sd_config_discard(sdkp, SD_LBP_WS16);
 377        else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
 378                sd_config_discard(sdkp, SD_LBP_WS10);
 379        else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
 380                sd_config_discard(sdkp, SD_LBP_ZERO);
 381        else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
 382                sd_config_discard(sdkp, SD_LBP_DISABLE);
 383        else
 384                return -EINVAL;
 385
 386        return count;
 387}
 388
 389static ssize_t
 390sd_show_max_medium_access_timeouts(struct device *dev,
 391                                   struct device_attribute *attr, char *buf)
 392{
 393        struct scsi_disk *sdkp = to_scsi_disk(dev);
 394
 395        return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
 396}
 397
 398static ssize_t
 399sd_store_max_medium_access_timeouts(struct device *dev,
 400                                    struct device_attribute *attr,
 401                                    const char *buf, size_t count)
 402{
 403        struct scsi_disk *sdkp = to_scsi_disk(dev);
 404        int err;
 405
 406        if (!capable(CAP_SYS_ADMIN))
 407                return -EACCES;
 408
 409        err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 410
 411        return err ? err : count;
 412}
 413
 414static ssize_t
 415sd_show_write_same_blocks(struct device *dev, struct device_attribute *attr,
 416                          char *buf)
 417{
 418        struct scsi_disk *sdkp = to_scsi_disk(dev);
 419
 420        return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
 421}
 422
 423static ssize_t
 424sd_store_write_same_blocks(struct device *dev, struct device_attribute *attr,
 425                           const char *buf, size_t count)
 426{
 427        struct scsi_disk *sdkp = to_scsi_disk(dev);
 428        struct scsi_device *sdp = sdkp->device;
 429        unsigned long max;
 430        int err;
 431
 432        if (!capable(CAP_SYS_ADMIN))
 433                return -EACCES;
 434
 435        if (sdp->type != TYPE_DISK)
 436                return -EINVAL;
 437
 438        err = kstrtoul(buf, 10, &max);
 439
 440        if (err)
 441                return err;
 442
 443        if (max == 0)
 444                sdp->no_write_same = 1;
 445        else if (max <= SD_MAX_WS16_BLOCKS)
 446                sdkp->max_ws_blocks = max;
 447
 448        sd_config_write_same(sdkp);
 449
 450        return count;
 451}
 452
 453static struct device_attribute sd_disk_attrs[] = {
 454        __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
 455               sd_store_cache_type),
 456        __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
 457        __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
 458               sd_store_allow_restart),
 459        __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
 460               sd_store_manage_start_stop),
 461        __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
 462               sd_store_protection_type),
 463        __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
 464        __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
 465        __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
 466        __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
 467               sd_store_provisioning_mode),
 468        __ATTR(max_write_same_blocks, S_IRUGO|S_IWUSR,
 469               sd_show_write_same_blocks, sd_store_write_same_blocks),
 470        __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
 471               sd_show_max_medium_access_timeouts,
 472               sd_store_max_medium_access_timeouts),
 473        __ATTR_NULL,
 474};
 475
 476static struct class sd_disk_class = {
 477        .name           = "scsi_disk",
 478        .owner          = THIS_MODULE,
 479        .dev_release    = scsi_disk_release,
 480        .dev_attrs      = sd_disk_attrs,
 481};
 482
 483static const struct dev_pm_ops sd_pm_ops = {
 484        .suspend                = sd_suspend,
 485        .resume                 = sd_resume,
 486        .poweroff               = sd_suspend,
 487        .restore                = sd_resume,
 488        .runtime_suspend        = sd_suspend,
 489        .runtime_resume         = sd_resume,
 490};
 491
 492static struct scsi_driver sd_template = {
 493        .owner                  = THIS_MODULE,
 494        .gendrv = {
 495                .name           = "sd",
 496                .probe          = sd_probe,
 497                .remove         = sd_remove,
 498                .shutdown       = sd_shutdown,
 499                .pm             = &sd_pm_ops,
 500        },
 501        .rescan                 = sd_rescan,
 502        .done                   = sd_done,
 503        .eh_action              = sd_eh_action,
 504};
 505
 506/*
 507 * Device no to disk mapping:
 508 * 
 509 *       major         disc2     disc  p1
 510 *   |............|.............|....|....| <- dev_t
 511 *    31        20 19          8 7  4 3  0
 512 * 
 513 * Inside a major, we have 16k disks, however mapped non-
 514 * contiguously. The first 16 disks are for major0, the next
 515 * ones with major1, ... Disk 256 is for major0 again, disk 272 
 516 * for major1, ... 
 517 * As we stay compatible with our numbering scheme, we can reuse 
 518 * the well-know SCSI majors 8, 65--71, 136--143.
 519 */
 520static int sd_major(int major_idx)
 521{
 522        switch (major_idx) {
 523        case 0:
 524                return SCSI_DISK0_MAJOR;
 525        case 1 ... 7:
 526                return SCSI_DISK1_MAJOR + major_idx - 1;
 527        case 8 ... 15:
 528                return SCSI_DISK8_MAJOR + major_idx - 8;
 529        default:
 530                BUG();
 531                return 0;       /* shut up gcc */
 532        }
 533}
 534
 535static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
 536{
 537        struct scsi_disk *sdkp = NULL;
 538
 539        if (disk->private_data) {
 540                sdkp = scsi_disk(disk);
 541                if (scsi_device_get(sdkp->device) == 0)
 542                        get_device(&sdkp->dev);
 543                else
 544                        sdkp = NULL;
 545        }
 546        return sdkp;
 547}
 548
 549static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 550{
 551        struct scsi_disk *sdkp;
 552
 553        mutex_lock(&sd_ref_mutex);
 554        sdkp = __scsi_disk_get(disk);
 555        mutex_unlock(&sd_ref_mutex);
 556        return sdkp;
 557}
 558
 559static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
 560{
 561        struct scsi_disk *sdkp;
 562
 563        mutex_lock(&sd_ref_mutex);
 564        sdkp = dev_get_drvdata(dev);
 565        if (sdkp)
 566                sdkp = __scsi_disk_get(sdkp->disk);
 567        mutex_unlock(&sd_ref_mutex);
 568        return sdkp;
 569}
 570
 571static void scsi_disk_put(struct scsi_disk *sdkp)
 572{
 573        struct scsi_device *sdev = sdkp->device;
 574
 575        mutex_lock(&sd_ref_mutex);
 576        put_device(&sdkp->dev);
 577        scsi_device_put(sdev);
 578        mutex_unlock(&sd_ref_mutex);
 579}
 580
 581static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
 582{
 583        unsigned int prot_op = SCSI_PROT_NORMAL;
 584        unsigned int dix = scsi_prot_sg_count(scmd);
 585
 586        if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
 587                if (dif && dix)
 588                        prot_op = SCSI_PROT_READ_PASS;
 589                else if (dif && !dix)
 590                        prot_op = SCSI_PROT_READ_STRIP;
 591                else if (!dif && dix)
 592                        prot_op = SCSI_PROT_READ_INSERT;
 593        } else {
 594                if (dif && dix)
 595                        prot_op = SCSI_PROT_WRITE_PASS;
 596                else if (dif && !dix)
 597                        prot_op = SCSI_PROT_WRITE_INSERT;
 598                else if (!dif && dix)
 599                        prot_op = SCSI_PROT_WRITE_STRIP;
 600        }
 601
 602        scsi_set_prot_op(scmd, prot_op);
 603        scsi_set_prot_type(scmd, dif);
 604}
 605
 606static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 607{
 608        struct request_queue *q = sdkp->disk->queue;
 609        unsigned int logical_block_size = sdkp->device->sector_size;
 610        unsigned int max_blocks = 0;
 611
 612        q->limits.discard_zeroes_data = sdkp->lbprz;
 613        q->limits.discard_alignment = sdkp->unmap_alignment *
 614                logical_block_size;
 615        q->limits.discard_granularity =
 616                max(sdkp->physical_block_size,
 617                    sdkp->unmap_granularity * logical_block_size);
 618
 619        sdkp->provisioning_mode = mode;
 620
 621        switch (mode) {
 622
 623        case SD_LBP_DISABLE:
 624                q->limits.max_discard_sectors = 0;
 625                queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
 626                return;
 627
 628        case SD_LBP_UNMAP:
 629                max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 630                                          (u32)SD_MAX_WS16_BLOCKS);
 631                break;
 632
 633        case SD_LBP_WS16:
 634                max_blocks = min_not_zero(sdkp->max_ws_blocks,
 635                                          (u32)SD_MAX_WS16_BLOCKS);
 636                break;
 637
 638        case SD_LBP_WS10:
 639                max_blocks = min_not_zero(sdkp->max_ws_blocks,
 640                                          (u32)SD_MAX_WS10_BLOCKS);
 641                break;
 642
 643        case SD_LBP_ZERO:
 644                max_blocks = min_not_zero(sdkp->max_ws_blocks,
 645                                          (u32)SD_MAX_WS10_BLOCKS);
 646                q->limits.discard_zeroes_data = 1;
 647                break;
 648        }
 649
 650        q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
 651        queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
 652}
 653
 654/**
 655 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
 656 * @sdp: scsi device to operate one
 657 * @rq: Request to prepare
 658 *
 659 * Will issue either UNMAP or WRITE SAME(16) depending on preference
 660 * indicated by target device.
 661 **/
 662static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
 663{
 664        struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 665        sector_t sector = blk_rq_pos(rq);
 666        unsigned int nr_sectors = blk_rq_sectors(rq);
 667        unsigned int nr_bytes = blk_rq_bytes(rq);
 668        unsigned int len;
 669        int ret;
 670        char *buf;
 671        struct page *page;
 672
 673        sector >>= ilog2(sdp->sector_size) - 9;
 674        nr_sectors >>= ilog2(sdp->sector_size) - 9;
 675        rq->timeout = SD_TIMEOUT;
 676
 677        memset(rq->cmd, 0, rq->cmd_len);
 678
 679        page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 680        if (!page)
 681                return BLKPREP_DEFER;
 682
 683        switch (sdkp->provisioning_mode) {
 684        case SD_LBP_UNMAP:
 685                buf = page_address(page);
 686
 687                rq->cmd_len = 10;
 688                rq->cmd[0] = UNMAP;
 689                rq->cmd[8] = 24;
 690
 691                put_unaligned_be16(6 + 16, &buf[0]);
 692                put_unaligned_be16(16, &buf[2]);
 693                put_unaligned_be64(sector, &buf[8]);
 694                put_unaligned_be32(nr_sectors, &buf[16]);
 695
 696                len = 24;
 697                break;
 698
 699        case SD_LBP_WS16:
 700                rq->cmd_len = 16;
 701                rq->cmd[0] = WRITE_SAME_16;
 702                rq->cmd[1] = 0x8; /* UNMAP */
 703                put_unaligned_be64(sector, &rq->cmd[2]);
 704                put_unaligned_be32(nr_sectors, &rq->cmd[10]);
 705
 706                len = sdkp->device->sector_size;
 707                break;
 708
 709        case SD_LBP_WS10:
 710        case SD_LBP_ZERO:
 711                rq->cmd_len = 10;
 712                rq->cmd[0] = WRITE_SAME;
 713                if (sdkp->provisioning_mode == SD_LBP_WS10)
 714                        rq->cmd[1] = 0x8; /* UNMAP */
 715                put_unaligned_be32(sector, &rq->cmd[2]);
 716                put_unaligned_be16(nr_sectors, &rq->cmd[7]);
 717
 718                len = sdkp->device->sector_size;
 719                break;
 720
 721        default:
 722                ret = BLKPREP_KILL;
 723                goto out;
 724        }
 725
 726        blk_add_request_payload(rq, page, len);
 727        ret = scsi_setup_blk_pc_cmnd(sdp, rq);
 728        rq->buffer = page_address(page);
 729        rq->__data_len = nr_bytes;
 730
 731out:
 732        if (ret != BLKPREP_OK) {
 733                __free_page(page);
 734                rq->buffer = NULL;
 735        }
 736        return ret;
 737}
 738
 739static void sd_config_write_same(struct scsi_disk *sdkp)
 740{
 741        struct request_queue *q = sdkp->disk->queue;
 742        unsigned int logical_block_size = sdkp->device->sector_size;
 743        unsigned int blocks = 0;
 744
 745        if (sdkp->device->no_write_same) {
 746                sdkp->max_ws_blocks = 0;
 747                goto out;
 748        }
 749
 750        /* Some devices can not handle block counts above 0xffff despite
 751         * supporting WRITE SAME(16). Consequently we default to 64k
 752         * blocks per I/O unless the device explicitly advertises a
 753         * bigger limit.
 754         */
 755        if (sdkp->max_ws_blocks == 0)
 756                sdkp->max_ws_blocks = SD_MAX_WS10_BLOCKS;
 757
 758        if (sdkp->ws16 || sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 759                blocks = min_not_zero(sdkp->max_ws_blocks,
 760                                      (u32)SD_MAX_WS16_BLOCKS);
 761        else
 762                blocks = min_not_zero(sdkp->max_ws_blocks,
 763                                      (u32)SD_MAX_WS10_BLOCKS);
 764
 765out:
 766        blk_queue_max_write_same_sectors(q, blocks * (logical_block_size >> 9));
 767}
 768
 769/**
 770 * sd_setup_write_same_cmnd - write the same data to multiple blocks
 771 * @sdp: scsi device to operate one
 772 * @rq: Request to prepare
 773 *
 774 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
 775 * preference indicated by target device.
 776 **/
 777static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
 778{
 779        struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 780        struct bio *bio = rq->bio;
 781        sector_t sector = blk_rq_pos(rq);
 782        unsigned int nr_sectors = blk_rq_sectors(rq);
 783        unsigned int nr_bytes = blk_rq_bytes(rq);
 784        int ret;
 785
 786        if (sdkp->device->no_write_same)
 787                return BLKPREP_KILL;
 788
 789        BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size);
 790
 791        sector >>= ilog2(sdp->sector_size) - 9;
 792        nr_sectors >>= ilog2(sdp->sector_size) - 9;
 793
 794        rq->__data_len = sdp->sector_size;
 795        rq->timeout = SD_WRITE_SAME_TIMEOUT;
 796        memset(rq->cmd, 0, rq->cmd_len);
 797
 798        if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
 799                rq->cmd_len = 16;
 800                rq->cmd[0] = WRITE_SAME_16;
 801                put_unaligned_be64(sector, &rq->cmd[2]);
 802                put_unaligned_be32(nr_sectors, &rq->cmd[10]);
 803        } else {
 804                rq->cmd_len = 10;
 805                rq->cmd[0] = WRITE_SAME;
 806                put_unaligned_be32(sector, &rq->cmd[2]);
 807                put_unaligned_be16(nr_sectors, &rq->cmd[7]);
 808        }
 809
 810        ret = scsi_setup_blk_pc_cmnd(sdp, rq);
 811        rq->__data_len = nr_bytes;
 812
 813        return ret;
 814}
 815
 816static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
 817{
 818        rq->timeout = SD_FLUSH_TIMEOUT;
 819        rq->retries = SD_MAX_RETRIES;
 820        rq->cmd[0] = SYNCHRONIZE_CACHE;
 821        rq->cmd_len = 10;
 822
 823        return scsi_setup_blk_pc_cmnd(sdp, rq);
 824}
 825
 826static void sd_unprep_fn(struct request_queue *q, struct request *rq)
 827{
 828        if (rq->cmd_flags & REQ_DISCARD) {
 829                free_page((unsigned long)rq->buffer);
 830                rq->buffer = NULL;
 831        }
 832}
 833
 834/**
 835 *      sd_prep_fn - build a scsi (read or write) command from
 836 *      information in the request structure.
 837 *      @SCpnt: pointer to mid-level's per scsi command structure that
 838 *      contains request and into which the scsi command is written
 839 *
 840 *      Returns 1 if successful and 0 if error (or cannot be done now).
 841 **/
 842static int sd_prep_fn(struct request_queue *q, struct request *rq)
 843{
 844        struct scsi_cmnd *SCpnt;
 845        struct scsi_device *sdp = q->queuedata;
 846        struct gendisk *disk = rq->rq_disk;
 847        struct scsi_disk *sdkp;
 848        sector_t block = blk_rq_pos(rq);
 849        sector_t threshold;
 850        unsigned int this_count = blk_rq_sectors(rq);
 851        int ret, host_dif;
 852        unsigned char protect;
 853
 854        /*
 855         * Discard request come in as REQ_TYPE_FS but we turn them into
 856         * block PC requests to make life easier.
 857         */
 858        if (rq->cmd_flags & REQ_DISCARD) {
 859                ret = sd_setup_discard_cmnd(sdp, rq);
 860                goto out;
 861        } else if (rq->cmd_flags & REQ_WRITE_SAME) {
 862                ret = sd_setup_write_same_cmnd(sdp, rq);
 863                goto out;
 864        } else if (rq->cmd_flags & REQ_FLUSH) {
 865                ret = scsi_setup_flush_cmnd(sdp, rq);
 866                goto out;
 867        } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
 868                ret = scsi_setup_blk_pc_cmnd(sdp, rq);
 869                goto out;
 870        } else if (rq->cmd_type != REQ_TYPE_FS) {
 871                ret = BLKPREP_KILL;
 872                goto out;
 873        }
 874        ret = scsi_setup_fs_cmnd(sdp, rq);
 875        if (ret != BLKPREP_OK)
 876                goto out;
 877        SCpnt = rq->special;
 878        sdkp = scsi_disk(disk);
 879
 880        /* from here on until we're complete, any goto out
 881         * is used for a killable error condition */
 882        ret = BLKPREP_KILL;
 883
 884        SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
 885                                        "sd_prep_fn: block=%llu, "
 886                                        "count=%d\n",
 887                                        (unsigned long long)block,
 888                                        this_count));
 889
 890        if (!sdp || !scsi_device_online(sdp) ||
 891            block + blk_rq_sectors(rq) > get_capacity(disk)) {
 892                SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
 893                                                "Finishing %u sectors\n",
 894                                                blk_rq_sectors(rq)));
 895                SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
 896                                                "Retry with 0x%p\n", SCpnt));
 897                goto out;
 898        }
 899
 900        if (sdp->changed) {
 901                /*
 902                 * quietly refuse to do anything to a changed disc until 
 903                 * the changed bit has been reset
 904                 */
 905                /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
 906                goto out;
 907        }
 908
 909        /*
 910         * Some SD card readers can't handle multi-sector accesses which touch
 911         * the last one or two hardware sectors.  Split accesses as needed.
 912         */
 913        threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
 914                (sdp->sector_size / 512);
 915
 916        if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
 917                if (block < threshold) {
 918                        /* Access up to the threshold but not beyond */
 919                        this_count = threshold - block;
 920                } else {
 921                        /* Access only a single hardware sector */
 922                        this_count = sdp->sector_size / 512;
 923                }
 924        }
 925
 926        SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
 927                                        (unsigned long long)block));
 928
 929        /*
 930         * If we have a 1K hardware sectorsize, prevent access to single
 931         * 512 byte sectors.  In theory we could handle this - in fact
 932         * the scsi cdrom driver must be able to handle this because
 933         * we typically use 1K blocksizes, and cdroms typically have
 934         * 2K hardware sectorsizes.  Of course, things are simpler
 935         * with the cdrom, since it is read-only.  For performance
 936         * reasons, the filesystems should be able to handle this
 937         * and not force the scsi disk driver to use bounce buffers
 938         * for this.
 939         */
 940        if (sdp->sector_size == 1024) {
 941                if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
 942                        scmd_printk(KERN_ERR, SCpnt,
 943                                    "Bad block number requested\n");
 944                        goto out;
 945                } else {
 946                        block = block >> 1;
 947                        this_count = this_count >> 1;
 948                }
 949        }
 950        if (sdp->sector_size == 2048) {
 951                if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
 952                        scmd_printk(KERN_ERR, SCpnt,
 953                                    "Bad block number requested\n");
 954                        goto out;
 955                } else {
 956                        block = block >> 2;
 957                        this_count = this_count >> 2;
 958                }
 959        }
 960        if (sdp->sector_size == 4096) {
 961                if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
 962                        scmd_printk(KERN_ERR, SCpnt,
 963                                    "Bad block number requested\n");
 964                        goto out;
 965                } else {
 966                        block = block >> 3;
 967                        this_count = this_count >> 3;
 968                }
 969        }
 970        if (rq_data_dir(rq) == WRITE) {
 971                if (!sdp->writeable) {
 972                        goto out;
 973                }
 974                SCpnt->cmnd[0] = WRITE_6;
 975                SCpnt->sc_data_direction = DMA_TO_DEVICE;
 976
 977                if (blk_integrity_rq(rq))
 978                        sd_dif_prepare(rq, block, sdp->sector_size);
 979
 980        } else if (rq_data_dir(rq) == READ) {
 981                SCpnt->cmnd[0] = READ_6;
 982                SCpnt->sc_data_direction = DMA_FROM_DEVICE;
 983        } else {
 984                scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
 985                goto out;
 986        }
 987
 988        SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
 989                                        "%s %d/%u 512 byte blocks.\n",
 990                                        (rq_data_dir(rq) == WRITE) ?
 991                                        "writing" : "reading", this_count,
 992                                        blk_rq_sectors(rq)));
 993
 994        /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
 995        host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 996        if (host_dif)
 997                protect = 1 << 5;
 998        else
 999                protect = 0;
1000
1001        if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1002                SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1003
1004                if (unlikely(SCpnt->cmnd == NULL)) {
1005                        ret = BLKPREP_DEFER;
1006                        goto out;
1007                }
1008
1009                SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1010                memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1011                SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1012                SCpnt->cmnd[7] = 0x18;
1013                SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1014                SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1015
1016                /* LBA */
1017                SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1018                SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1019                SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1020                SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1021                SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1022                SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1023                SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1024                SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1025
1026                /* Expected Indirect LBA */
1027                SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1028                SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1029                SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1030                SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1031
1032                /* Transfer length */
1033                SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1034                SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1035                SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1036                SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1037        } else if (sdp->use_16_for_rw) {
1038                SCpnt->cmnd[0] += READ_16 - READ_6;
1039                SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1040                SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1041                SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1042                SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1043                SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1044                SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1045                SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1046                SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1047                SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1048                SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1049                SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1050                SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1051                SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1052                SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1053        } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1054                   scsi_device_protection(SCpnt->device) ||
1055                   SCpnt->device->use_10_for_rw) {
1056                if (this_count > 0xffff)
1057                        this_count = 0xffff;
1058
1059                SCpnt->cmnd[0] += READ_10 - READ_6;
1060                SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1061                SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1062                SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1063                SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1064                SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1065                SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1066                SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1067                SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1068        } else {
1069                if (unlikely(rq->cmd_flags & REQ_FUA)) {
1070                        /*
1071                         * This happens only if this drive failed
1072                         * 10byte rw command with ILLEGAL_REQUEST
1073                         * during operation and thus turned off
1074                         * use_10_for_rw.
1075                         */
1076                        scmd_printk(KERN_ERR, SCpnt,
1077                                    "FUA write on READ/WRITE(6) drive\n");
1078                        goto out;
1079                }
1080
1081                SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1082                SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1083                SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1084                SCpnt->cmnd[4] = (unsigned char) this_count;
1085                SCpnt->cmnd[5] = 0;
1086        }
1087        SCpnt->sdb.length = this_count * sdp->sector_size;
1088
1089        /* If DIF or DIX is enabled, tell HBA how to handle request */
1090        if (host_dif || scsi_prot_sg_count(SCpnt))
1091                sd_prot_op(SCpnt, host_dif);
1092
1093        /*
1094         * We shouldn't disconnect in the middle of a sector, so with a dumb
1095         * host adapter, it's safe to assume that we can at least transfer
1096         * this many bytes between each connect / disconnect.
1097         */
1098        SCpnt->transfersize = sdp->sector_size;
1099        SCpnt->underflow = this_count << 9;
1100        SCpnt->allowed = SD_MAX_RETRIES;
1101
1102        /*
1103         * This indicates that the command is ready from our end to be
1104         * queued.
1105         */
1106        ret = BLKPREP_OK;
1107 out:
1108        return scsi_prep_return(q, rq, ret);
1109}
1110
1111/**
1112 *      sd_open - open a scsi disk device
1113 *      @inode: only i_rdev member may be used
1114 *      @filp: only f_mode and f_flags may be used
1115 *
1116 *      Returns 0 if successful. Returns a negated errno value in case 
1117 *      of error.
1118 *
1119 *      Note: This can be called from a user context (e.g. fsck(1) )
1120 *      or from within the kernel (e.g. as a result of a mount(1) ).
1121 *      In the latter case @inode and @filp carry an abridged amount
1122 *      of information as noted above.
1123 *
1124 *      Locking: called with bdev->bd_mutex held.
1125 **/
1126static int sd_open(struct block_device *bdev, fmode_t mode)
1127{
1128        struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1129        struct scsi_device *sdev;
1130        int retval;
1131
1132        if (!sdkp)
1133                return -ENXIO;
1134
1135        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1136
1137        sdev = sdkp->device;
1138
1139        /*
1140         * If the device is in error recovery, wait until it is done.
1141         * If the device is offline, then disallow any access to it.
1142         */
1143        retval = -ENXIO;
1144        if (!scsi_block_when_processing_errors(sdev))
1145                goto error_out;
1146
1147        if (sdev->removable || sdkp->write_prot)
1148                check_disk_change(bdev);
1149
1150        /*
1151         * If the drive is empty, just let the open fail.
1152         */
1153        retval = -ENOMEDIUM;
1154        if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1155                goto error_out;
1156
1157        /*
1158         * If the device has the write protect tab set, have the open fail
1159         * if the user expects to be able to write to the thing.
1160         */
1161        retval = -EROFS;
1162        if (sdkp->write_prot && (mode & FMODE_WRITE))
1163                goto error_out;
1164
1165        /*
1166         * It is possible that the disk changing stuff resulted in
1167         * the device being taken offline.  If this is the case,
1168         * report this to the user, and don't pretend that the
1169         * open actually succeeded.
1170         */
1171        retval = -ENXIO;
1172        if (!scsi_device_online(sdev))
1173                goto error_out;
1174
1175        if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1176                if (scsi_block_when_processing_errors(sdev))
1177                        scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1178        }
1179
1180        return 0;
1181
1182error_out:
1183        scsi_disk_put(sdkp);
1184        return retval;  
1185}
1186
1187/**
1188 *      sd_release - invoked when the (last) close(2) is called on this
1189 *      scsi disk.
1190 *      @inode: only i_rdev member may be used
1191 *      @filp: only f_mode and f_flags may be used
1192 *
1193 *      Returns 0. 
1194 *
1195 *      Note: may block (uninterruptible) if error recovery is underway
1196 *      on this disk.
1197 *
1198 *      Locking: called with bdev->bd_mutex held.
1199 **/
1200static void sd_release(struct gendisk *disk, fmode_t mode)
1201{
1202        struct scsi_disk *sdkp = scsi_disk(disk);
1203        struct scsi_device *sdev = sdkp->device;
1204
1205        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1206
1207        if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1208                if (scsi_block_when_processing_errors(sdev))
1209                        scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1210        }
1211
1212        /*
1213         * XXX and what if there are packets in flight and this close()
1214         * XXX is followed by a "rmmod sd_mod"?
1215         */
1216
1217        scsi_disk_put(sdkp);
1218}
1219
1220static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1221{
1222        struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1223        struct scsi_device *sdp = sdkp->device;
1224        struct Scsi_Host *host = sdp->host;
1225        int diskinfo[4];
1226
1227        /* default to most commonly used values */
1228        diskinfo[0] = 0x40;     /* 1 << 6 */
1229        diskinfo[1] = 0x20;     /* 1 << 5 */
1230        diskinfo[2] = sdkp->capacity >> 11;
1231        
1232        /* override with calculated, extended default, or driver values */
1233        if (host->hostt->bios_param)
1234                host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1235        else
1236                scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1237
1238        geo->heads = diskinfo[0];
1239        geo->sectors = diskinfo[1];
1240        geo->cylinders = diskinfo[2];
1241        return 0;
1242}
1243
1244/**
1245 *      sd_ioctl - process an ioctl
1246 *      @inode: only i_rdev/i_bdev members may be used
1247 *      @filp: only f_mode and f_flags may be used
1248 *      @cmd: ioctl command number
1249 *      @arg: this is third argument given to ioctl(2) system call.
1250 *      Often contains a pointer.
1251 *
1252 *      Returns 0 if successful (some ioctls return positive numbers on
1253 *      success as well). Returns a negated errno value in case of error.
1254 *
1255 *      Note: most ioctls are forward onto the block subsystem or further
1256 *      down in the scsi subsystem.
1257 **/
1258static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1259                    unsigned int cmd, unsigned long arg)
1260{
1261        struct gendisk *disk = bdev->bd_disk;
1262        struct scsi_disk *sdkp = scsi_disk(disk);
1263        struct scsi_device *sdp = sdkp->device;
1264        void __user *p = (void __user *)arg;
1265        int error;
1266    
1267        SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1268                                    "cmd=0x%x\n", disk->disk_name, cmd));
1269
1270        error = scsi_verify_blk_ioctl(bdev, cmd);
1271        if (error < 0)
1272                return error;
1273
1274        /*
1275         * If we are in the middle of error recovery, don't let anyone
1276         * else try and use this device.  Also, if error recovery fails, it
1277         * may try and take the device offline, in which case all further
1278         * access to the device is prohibited.
1279         */
1280        error = scsi_nonblockable_ioctl(sdp, cmd, p,
1281                                        (mode & FMODE_NDELAY) != 0);
1282        if (!scsi_block_when_processing_errors(sdp) || !error)
1283                goto out;
1284
1285        /*
1286         * Send SCSI addressing ioctls directly to mid level, send other
1287         * ioctls to block level and then onto mid level if they can't be
1288         * resolved.
1289         */
1290        switch (cmd) {
1291                case SCSI_IOCTL_GET_IDLUN:
1292                case SCSI_IOCTL_GET_BUS_NUMBER:
1293                        error = scsi_ioctl(sdp, cmd, p);
1294                        break;
1295                default:
1296                        error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1297                        if (error != -ENOTTY)
1298                                break;
1299                        error = scsi_ioctl(sdp, cmd, p);
1300                        break;
1301        }
1302out:
1303        return error;
1304}
1305
1306static void set_media_not_present(struct scsi_disk *sdkp)
1307{
1308        if (sdkp->media_present)
1309                sdkp->device->changed = 1;
1310
1311        if (sdkp->device->removable) {
1312                sdkp->media_present = 0;
1313                sdkp->capacity = 0;
1314        }
1315}
1316
1317static int media_not_present(struct scsi_disk *sdkp,
1318                             struct scsi_sense_hdr *sshdr)
1319{
1320        if (!scsi_sense_valid(sshdr))
1321                return 0;
1322
1323        /* not invoked for commands that could return deferred errors */
1324        switch (sshdr->sense_key) {
1325        case UNIT_ATTENTION:
1326        case NOT_READY:
1327                /* medium not present */
1328                if (sshdr->asc == 0x3A) {
1329                        set_media_not_present(sdkp);
1330                        return 1;
1331                }
1332        }
1333        return 0;
1334}
1335
1336/**
1337 *      sd_check_events - check media events
1338 *      @disk: kernel device descriptor
1339 *      @clearing: disk events currently being cleared
1340 *
1341 *      Returns mask of DISK_EVENT_*.
1342 *
1343 *      Note: this function is invoked from the block subsystem.
1344 **/
1345static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1346{
1347        struct scsi_disk *sdkp = scsi_disk(disk);
1348        struct scsi_device *sdp = sdkp->device;
1349        struct scsi_sense_hdr *sshdr = NULL;
1350        int retval;
1351
1352        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1353
1354        /*
1355         * If the device is offline, don't send any commands - just pretend as
1356         * if the command failed.  If the device ever comes back online, we
1357         * can deal with it then.  It is only because of unrecoverable errors
1358         * that we would ever take a device offline in the first place.
1359         */
1360        if (!scsi_device_online(sdp)) {
1361                set_media_not_present(sdkp);
1362                goto out;
1363        }
1364
1365        /*
1366         * Using TEST_UNIT_READY enables differentiation between drive with
1367         * no cartridge loaded - NOT READY, drive with changed cartridge -
1368         * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1369         *
1370         * Drives that auto spin down. eg iomega jaz 1G, will be started
1371         * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1372         * sd_revalidate() is called.
1373         */
1374        retval = -ENODEV;
1375
1376        if (scsi_block_when_processing_errors(sdp)) {
1377                sshdr  = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1378                retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1379                                              sshdr);
1380        }
1381
1382        /* failed to execute TUR, assume media not present */
1383        if (host_byte(retval)) {
1384                set_media_not_present(sdkp);
1385                goto out;
1386        }
1387
1388        if (media_not_present(sdkp, sshdr))
1389                goto out;
1390
1391        /*
1392         * For removable scsi disk we have to recognise the presence
1393         * of a disk in the drive.
1394         */
1395        if (!sdkp->media_present)
1396                sdp->changed = 1;
1397        sdkp->media_present = 1;
1398out:
1399        /*
1400         * sdp->changed is set under the following conditions:
1401         *
1402         *      Medium present state has changed in either direction.
1403         *      Device has indicated UNIT_ATTENTION.
1404         */
1405        kfree(sshdr);
1406        retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1407        sdp->changed = 0;
1408        return retval;
1409}
1410
1411static int sd_sync_cache(struct scsi_disk *sdkp)
1412{
1413        int retries, res;
1414        struct scsi_device *sdp = sdkp->device;
1415        struct scsi_sense_hdr sshdr;
1416
1417        if (!scsi_device_online(sdp))
1418                return -ENODEV;
1419
1420
1421        for (retries = 3; retries > 0; --retries) {
1422                unsigned char cmd[10] = { 0 };
1423
1424                cmd[0] = SYNCHRONIZE_CACHE;
1425                /*
1426                 * Leave the rest of the command zero to indicate
1427                 * flush everything.
1428                 */
1429                res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1430                                             &sshdr, SD_FLUSH_TIMEOUT,
1431                                             SD_MAX_RETRIES, NULL, REQ_PM);
1432                if (res == 0)
1433                        break;
1434        }
1435
1436        if (res) {
1437                sd_print_result(sdkp, res);
1438                if (driver_byte(res) & DRIVER_SENSE)
1439                        sd_print_sense_hdr(sdkp, &sshdr);
1440        }
1441
1442        if (res)
1443                return -EIO;
1444        return 0;
1445}
1446
1447static void sd_rescan(struct device *dev)
1448{
1449        struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1450
1451        if (sdkp) {
1452                revalidate_disk(sdkp->disk);
1453                scsi_disk_put(sdkp);
1454        }
1455}
1456
1457
1458#ifdef CONFIG_COMPAT
1459/* 
1460 * This gets directly called from VFS. When the ioctl 
1461 * is not recognized we go back to the other translation paths. 
1462 */
1463static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1464                           unsigned int cmd, unsigned long arg)
1465{
1466        struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1467        int ret;
1468
1469        ret = scsi_verify_blk_ioctl(bdev, cmd);
1470        if (ret < 0)
1471                return ret;
1472
1473        /*
1474         * If we are in the middle of error recovery, don't let anyone
1475         * else try and use this device.  Also, if error recovery fails, it
1476         * may try and take the device offline, in which case all further
1477         * access to the device is prohibited.
1478         */
1479        if (!scsi_block_when_processing_errors(sdev))
1480                return -ENODEV;
1481               
1482        if (sdev->host->hostt->compat_ioctl) {
1483                ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1484
1485                return ret;
1486        }
1487
1488        /* 
1489         * Let the static ioctl translation table take care of it.
1490         */
1491        return -ENOIOCTLCMD; 
1492}
1493#endif
1494
1495static const struct block_device_operations sd_fops = {
1496        .owner                  = THIS_MODULE,
1497        .open                   = sd_open,
1498        .release                = sd_release,
1499        .ioctl                  = sd_ioctl,
1500        .getgeo                 = sd_getgeo,
1501#ifdef CONFIG_COMPAT
1502        .compat_ioctl           = sd_compat_ioctl,
1503#endif
1504        .check_events           = sd_check_events,
1505        .revalidate_disk        = sd_revalidate_disk,
1506        .unlock_native_capacity = sd_unlock_native_capacity,
1507};
1508
1509/**
1510 *      sd_eh_action - error handling callback
1511 *      @scmd:          sd-issued command that has failed
1512 *      @eh_cmnd:       The command that was sent during error handling
1513 *      @eh_cmnd_len:   Length of eh_cmnd in bytes
1514 *      @eh_disp:       The recovery disposition suggested by the midlayer
1515 *
1516 *      This function is called by the SCSI midlayer upon completion of
1517 *      an error handling command (TEST UNIT READY, START STOP UNIT,
1518 *      etc.) The command sent to the device by the error handler is
1519 *      stored in eh_cmnd. The result of sending the eh command is
1520 *      passed in eh_disp.
1521 **/
1522static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1523                        int eh_cmnd_len, int eh_disp)
1524{
1525        struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1526
1527        if (!scsi_device_online(scmd->device) ||
1528            !scsi_medium_access_command(scmd))
1529                return eh_disp;
1530
1531        /*
1532         * The device has timed out executing a medium access command.
1533         * However, the TEST UNIT READY command sent during error
1534         * handling completed successfully. Either the device is in the
1535         * process of recovering or has it suffered an internal failure
1536         * that prevents access to the storage medium.
1537         */
1538        if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1539            eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1540                sdkp->medium_access_timed_out++;
1541
1542        /*
1543         * If the device keeps failing read/write commands but TEST UNIT
1544         * READY always completes successfully we assume that medium
1545         * access is no longer possible and take the device offline.
1546         */
1547        if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1548                scmd_printk(KERN_ERR, scmd,
1549                            "Medium access timeout failure. Offlining disk!\n");
1550                scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1551
1552                return FAILED;
1553        }
1554
1555        return eh_disp;
1556}
1557
1558static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1559{
1560        u64 start_lba = blk_rq_pos(scmd->request);
1561        u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1562        u64 bad_lba;
1563        int info_valid;
1564        /*
1565         * resid is optional but mostly filled in.  When it's unused,
1566         * its value is zero, so we assume the whole buffer transferred
1567         */
1568        unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1569        unsigned int good_bytes;
1570
1571        if (scmd->request->cmd_type != REQ_TYPE_FS)
1572                return 0;
1573
1574        info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1575                                             SCSI_SENSE_BUFFERSIZE,
1576                                             &bad_lba);
1577        if (!info_valid)
1578                return 0;
1579
1580        if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1581                return 0;
1582
1583        if (scmd->device->sector_size < 512) {
1584                /* only legitimate sector_size here is 256 */
1585                start_lba <<= 1;
1586                end_lba <<= 1;
1587        } else {
1588                /* be careful ... don't want any overflows */
1589                u64 factor = scmd->device->sector_size / 512;
1590                do_div(start_lba, factor);
1591                do_div(end_lba, factor);
1592        }
1593
1594        /* The bad lba was reported incorrectly, we have no idea where
1595         * the error is.
1596         */
1597        if (bad_lba < start_lba  || bad_lba >= end_lba)
1598                return 0;
1599
1600        /* This computation should always be done in terms of
1601         * the resolution of the device's medium.
1602         */
1603        good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1604        return min(good_bytes, transferred);
1605}
1606
1607/**
1608 *      sd_done - bottom half handler: called when the lower level
1609 *      driver has completed (successfully or otherwise) a scsi command.
1610 *      @SCpnt: mid-level's per command structure.
1611 *
1612 *      Note: potentially run from within an ISR. Must not block.
1613 **/
1614static int sd_done(struct scsi_cmnd *SCpnt)
1615{
1616        int result = SCpnt->result;
1617        unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1618        struct scsi_sense_hdr sshdr;
1619        struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1620        struct request *req = SCpnt->request;
1621        int sense_valid = 0;
1622        int sense_deferred = 0;
1623        unsigned char op = SCpnt->cmnd[0];
1624        unsigned char unmap = SCpnt->cmnd[1] & 8;
1625
1626        if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1627                if (!result) {
1628                        good_bytes = blk_rq_bytes(req);
1629                        scsi_set_resid(SCpnt, 0);
1630                } else {
1631                        good_bytes = 0;
1632                        scsi_set_resid(SCpnt, blk_rq_bytes(req));
1633                }
1634        }
1635
1636        if (result) {
1637                sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1638                if (sense_valid)
1639                        sense_deferred = scsi_sense_is_deferred(&sshdr);
1640        }
1641#ifdef CONFIG_SCSI_LOGGING
1642        SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1643        if (sense_valid) {
1644                SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1645                                                   "sd_done: sb[respc,sk,asc,"
1646                                                   "ascq]=%x,%x,%x,%x\n",
1647                                                   sshdr.response_code,
1648                                                   sshdr.sense_key, sshdr.asc,
1649                                                   sshdr.ascq));
1650        }
1651#endif
1652        if (driver_byte(result) != DRIVER_SENSE &&
1653            (!sense_valid || sense_deferred))
1654                goto out;
1655
1656        sdkp->medium_access_timed_out = 0;
1657
1658        switch (sshdr.sense_key) {
1659        case HARDWARE_ERROR:
1660        case MEDIUM_ERROR:
1661                good_bytes = sd_completed_bytes(SCpnt);
1662                break;
1663        case RECOVERED_ERROR:
1664                good_bytes = scsi_bufflen(SCpnt);
1665                break;
1666        case NO_SENSE:
1667                /* This indicates a false check condition, so ignore it.  An
1668                 * unknown amount of data was transferred so treat it as an
1669                 * error.
1670                 */
1671                scsi_print_sense("sd", SCpnt);
1672                SCpnt->result = 0;
1673                memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1674                break;
1675        case ABORTED_COMMAND:
1676                if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
1677                        good_bytes = sd_completed_bytes(SCpnt);
1678                break;
1679        case ILLEGAL_REQUEST:
1680                if (sshdr.asc == 0x10)  /* DIX: Host detected corruption */
1681                        good_bytes = sd_completed_bytes(SCpnt);
1682                /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1683                if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1684                        switch (op) {
1685                        case UNMAP:
1686                                sd_config_discard(sdkp, SD_LBP_DISABLE);
1687                                break;
1688                        case WRITE_SAME_16:
1689                        case WRITE_SAME:
1690                                if (unmap)
1691                                        sd_config_discard(sdkp, SD_LBP_DISABLE);
1692                                else {
1693                                        sdkp->device->no_write_same = 1;
1694                                        sd_config_write_same(sdkp);
1695
1696                                        good_bytes = 0;
1697                                        req->__data_len = blk_rq_bytes(req);
1698                                        req->cmd_flags |= REQ_QUIET;
1699                                }
1700                        }
1701                }
1702                break;
1703        default:
1704                break;
1705        }
1706 out:
1707        if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1708                sd_dif_complete(SCpnt, good_bytes);
1709
1710        if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1711            == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1712
1713                /* We have to print a failed command here as the
1714                 * extended CDB gets freed before scsi_io_completion()
1715                 * is called.
1716                 */
1717                if (result)
1718                        scsi_print_command(SCpnt);
1719
1720                mempool_free(SCpnt->cmnd, sd_cdb_pool);
1721                SCpnt->cmnd = NULL;
1722                SCpnt->cmd_len = 0;
1723        }
1724
1725        return good_bytes;
1726}
1727
1728/*
1729 * spinup disk - called only in sd_revalidate_disk()
1730 */
1731static void
1732sd_spinup_disk(struct scsi_disk *sdkp)
1733{
1734        unsigned char cmd[10];
1735        unsigned long spintime_expire = 0;
1736        int retries, spintime;
1737        unsigned int the_result;
1738        struct scsi_sense_hdr sshdr;
1739        int sense_valid = 0;
1740
1741        spintime = 0;
1742
1743        /* Spin up drives, as required.  Only do this at boot time */
1744        /* Spinup needs to be done for module loads too. */
1745        do {
1746                retries = 0;
1747
1748                do {
1749                        cmd[0] = TEST_UNIT_READY;
1750                        memset((void *) &cmd[1], 0, 9);
1751
1752                        the_result = scsi_execute_req(sdkp->device, cmd,
1753                                                      DMA_NONE, NULL, 0,
1754                                                      &sshdr, SD_TIMEOUT,
1755                                                      SD_MAX_RETRIES, NULL);
1756
1757                        /*
1758                         * If the drive has indicated to us that it
1759                         * doesn't have any media in it, don't bother
1760                         * with any more polling.
1761                         */
1762                        if (media_not_present(sdkp, &sshdr))
1763                                return;
1764
1765                        if (the_result)
1766                                sense_valid = scsi_sense_valid(&sshdr);
1767                        retries++;
1768                } while (retries < 3 && 
1769                         (!scsi_status_is_good(the_result) ||
1770                          ((driver_byte(the_result) & DRIVER_SENSE) &&
1771                          sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1772
1773                if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1774                        /* no sense, TUR either succeeded or failed
1775                         * with a status error */
1776                        if(!spintime && !scsi_status_is_good(the_result)) {
1777                                sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1778                                sd_print_result(sdkp, the_result);
1779                        }
1780                        break;
1781                }
1782                                        
1783                /*
1784                 * The device does not want the automatic start to be issued.
1785                 */
1786                if (sdkp->device->no_start_on_add)
1787                        break;
1788
1789                if (sense_valid && sshdr.sense_key == NOT_READY) {
1790                        if (sshdr.asc == 4 && sshdr.ascq == 3)
1791                                break;  /* manual intervention required */
1792                        if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1793                                break;  /* standby */
1794                        if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1795                                break;  /* unavailable */
1796                        /*
1797                         * Issue command to spin up drive when not ready
1798                         */
1799                        if (!spintime) {
1800                                sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1801                                cmd[0] = START_STOP;
1802                                cmd[1] = 1;     /* Return immediately */
1803                                memset((void *) &cmd[2], 0, 8);
1804                                cmd[4] = 1;     /* Start spin cycle */
1805                                if (sdkp->device->start_stop_pwr_cond)
1806                                        cmd[4] |= 1 << 4;
1807                                scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1808                                                 NULL, 0, &sshdr,
1809                                                 SD_TIMEOUT, SD_MAX_RETRIES,
1810                                                 NULL);
1811                                spintime_expire = jiffies + 100 * HZ;
1812                                spintime = 1;
1813                        }
1814                        /* Wait 1 second for next try */
1815                        msleep(1000);
1816                        printk(".");
1817
1818                /*
1819                 * Wait for USB flash devices with slow firmware.
1820                 * Yes, this sense key/ASC combination shouldn't
1821                 * occur here.  It's characteristic of these devices.
1822                 */
1823                } else if (sense_valid &&
1824                                sshdr.sense_key == UNIT_ATTENTION &&
1825                                sshdr.asc == 0x28) {
1826                        if (!spintime) {
1827                                spintime_expire = jiffies + 5 * HZ;
1828                                spintime = 1;
1829                        }
1830                        /* Wait 1 second for next try */
1831                        msleep(1000);
1832                } else {
1833                        /* we don't understand the sense code, so it's
1834                         * probably pointless to loop */
1835                        if(!spintime) {
1836                                sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1837                                sd_print_sense_hdr(sdkp, &sshdr);
1838                        }
1839                        break;
1840                }
1841                                
1842        } while (spintime && time_before_eq(jiffies, spintime_expire));
1843
1844        if (spintime) {
1845                if (scsi_status_is_good(the_result))
1846                        printk("ready\n");
1847                else
1848                        printk("not responding...\n");
1849        }
1850}
1851
1852
1853/*
1854 * Determine whether disk supports Data Integrity Field.
1855 */
1856static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1857{
1858        struct scsi_device *sdp = sdkp->device;
1859        u8 type;
1860        int ret = 0;
1861
1862        if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1863                return ret;
1864
1865        type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1866
1867        if (type > SD_DIF_TYPE3_PROTECTION)
1868                ret = -ENODEV;
1869        else if (scsi_host_dif_capable(sdp->host, type))
1870                ret = 1;
1871
1872        if (sdkp->first_scan || type != sdkp->protection_type)
1873                switch (ret) {
1874                case -ENODEV:
1875                        sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1876                                  " protection type %u. Disabling disk!\n",
1877                                  type);
1878                        break;
1879                case 1:
1880                        sd_printk(KERN_NOTICE, sdkp,
1881                                  "Enabling DIF Type %u protection\n", type);
1882                        break;
1883                case 0:
1884                        sd_printk(KERN_NOTICE, sdkp,
1885                                  "Disabling DIF Type %u protection\n", type);
1886                        break;
1887                }
1888
1889        sdkp->protection_type = type;
1890
1891        return ret;
1892}
1893
1894static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1895                        struct scsi_sense_hdr *sshdr, int sense_valid,
1896                        int the_result)
1897{
1898        sd_print_result(sdkp, the_result);
1899        if (driver_byte(the_result) & DRIVER_SENSE)
1900                sd_print_sense_hdr(sdkp, sshdr);
1901        else
1902                sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1903
1904        /*
1905         * Set dirty bit for removable devices if not ready -
1906         * sometimes drives will not report this properly.
1907         */
1908        if (sdp->removable &&
1909            sense_valid && sshdr->sense_key == NOT_READY)
1910                set_media_not_present(sdkp);
1911
1912        /*
1913         * We used to set media_present to 0 here to indicate no media
1914         * in the drive, but some drives fail read capacity even with
1915         * media present, so we can't do that.
1916         */
1917        sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1918}
1919
1920#define RC16_LEN 32
1921#if RC16_LEN > SD_BUF_SIZE
1922#error RC16_LEN must not be more than SD_BUF_SIZE
1923#endif
1924
1925#define READ_CAPACITY_RETRIES_ON_RESET  10
1926
1927static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1928                                                unsigned char *buffer)
1929{
1930        unsigned char cmd[16];
1931        struct scsi_sense_hdr sshdr;
1932        int sense_valid = 0;
1933        int the_result;
1934        int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1935        unsigned int alignment;
1936        unsigned long long lba;
1937        unsigned sector_size;
1938
1939        if (sdp->no_read_capacity_16)
1940                return -EINVAL;
1941
1942        do {
1943                memset(cmd, 0, 16);
1944                cmd[0] = SERVICE_ACTION_IN;
1945                cmd[1] = SAI_READ_CAPACITY_16;
1946                cmd[13] = RC16_LEN;
1947                memset(buffer, 0, RC16_LEN);
1948
1949                the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1950                                        buffer, RC16_LEN, &sshdr,
1951                                        SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1952
1953                if (media_not_present(sdkp, &sshdr))
1954                        return -ENODEV;
1955
1956                if (the_result) {
1957                        sense_valid = scsi_sense_valid(&sshdr);
1958                        if (sense_valid &&
1959                            sshdr.sense_key == ILLEGAL_REQUEST &&
1960                            (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1961                            sshdr.ascq == 0x00)
1962                                /* Invalid Command Operation Code or
1963                                 * Invalid Field in CDB, just retry
1964                                 * silently with RC10 */
1965                                return -EINVAL;
1966                        if (sense_valid &&
1967                            sshdr.sense_key == UNIT_ATTENTION &&
1968                            sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1969                                /* Device reset might occur several times,
1970                                 * give it one more chance */
1971                                if (--reset_retries > 0)
1972                                        continue;
1973                }
1974                retries--;
1975
1976        } while (the_result && retries);
1977
1978        if (the_result) {
1979                sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1980                read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1981                return -EINVAL;
1982        }
1983
1984        sector_size = get_unaligned_be32(&buffer[8]);
1985        lba = get_unaligned_be64(&buffer[0]);
1986
1987        if (sd_read_protection_type(sdkp, buffer) < 0) {
1988                sdkp->capacity = 0;
1989                return -ENODEV;
1990        }
1991
1992        if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1993                sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1994                        "kernel compiled with support for large block "
1995                        "devices.\n");
1996                sdkp->capacity = 0;
1997                return -EOVERFLOW;
1998        }
1999
2000        /* Logical blocks per physical block exponent */
2001        sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2002
2003        /* Lowest aligned logical block */
2004        alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2005        blk_queue_alignment_offset(sdp->request_queue, alignment);
2006        if (alignment && sdkp->first_scan)
2007                sd_printk(KERN_NOTICE, sdkp,
2008                          "physical block alignment offset: %u\n", alignment);
2009
2010        if (buffer[14] & 0x80) { /* LBPME */
2011                sdkp->lbpme = 1;
2012
2013                if (buffer[14] & 0x40) /* LBPRZ */
2014                        sdkp->lbprz = 1;
2015
2016                sd_config_discard(sdkp, SD_LBP_WS16);
2017        }
2018
2019        sdkp->capacity = lba + 1;
2020        return sector_size;
2021}
2022
2023static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2024                                                unsigned char *buffer)
2025{
2026        unsigned char cmd[16];
2027        struct scsi_sense_hdr sshdr;
2028        int sense_valid = 0;
2029        int the_result;
2030        int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2031        sector_t lba;
2032        unsigned sector_size;
2033
2034        do {
2035                cmd[0] = READ_CAPACITY;
2036                memset(&cmd[1], 0, 9);
2037                memset(buffer, 0, 8);
2038
2039                the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2040                                        buffer, 8, &sshdr,
2041                                        SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2042
2043                if (media_not_present(sdkp, &sshdr))
2044                        return -ENODEV;
2045
2046                if (the_result) {
2047                        sense_valid = scsi_sense_valid(&sshdr);
2048                        if (sense_valid &&
2049                            sshdr.sense_key == UNIT_ATTENTION &&
2050                            sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2051                                /* Device reset might occur several times,
2052                                 * give it one more chance */
2053                                if (--reset_retries > 0)
2054                                        continue;
2055                }
2056                retries--;
2057
2058        } while (the_result && retries);
2059
2060        if (the_result) {
2061                sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2062                read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2063                return -EINVAL;
2064        }
2065
2066        sector_size = get_unaligned_be32(&buffer[4]);
2067        lba = get_unaligned_be32(&buffer[0]);
2068
2069        if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2070                /* Some buggy (usb cardreader) devices return an lba of
2071                   0xffffffff when the want to report a size of 0 (with
2072                   which they really mean no media is present) */
2073                sdkp->capacity = 0;
2074                sdkp->physical_block_size = sector_size;
2075                return sector_size;
2076        }
2077
2078        if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2079                sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2080                        "kernel compiled with support for large block "
2081                        "devices.\n");
2082                sdkp->capacity = 0;
2083                return -EOVERFLOW;
2084        }
2085
2086        sdkp->capacity = lba + 1;
2087        sdkp->physical_block_size = sector_size;
2088        return sector_size;
2089}
2090
2091static int sd_try_rc16_first(struct scsi_device *sdp)
2092{
2093        if (sdp->host->max_cmd_len < 16)
2094                return 0;
2095        if (sdp->try_rc_10_first)
2096                return 0;
2097        if (sdp->scsi_level > SCSI_SPC_2)
2098                return 1;
2099        if (scsi_device_protection(sdp))
2100                return 1;
2101        return 0;
2102}
2103
2104/*
2105 * read disk capacity
2106 */
2107static void
2108sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2109{
2110        int sector_size;
2111        struct scsi_device *sdp = sdkp->device;
2112        sector_t old_capacity = sdkp->capacity;
2113
2114        if (sd_try_rc16_first(sdp)) {
2115                sector_size = read_capacity_16(sdkp, sdp, buffer);
2116                if (sector_size == -EOVERFLOW)
2117                        goto got_data;
2118                if (sector_size == -ENODEV)
2119                        return;
2120                if (sector_size < 0)
2121                        sector_size = read_capacity_10(sdkp, sdp, buffer);
2122                if (sector_size < 0)
2123                        return;
2124        } else {
2125                sector_size = read_capacity_10(sdkp, sdp, buffer);
2126                if (sector_size == -EOVERFLOW)
2127                        goto got_data;
2128                if (sector_size < 0)
2129                        return;
2130                if ((sizeof(sdkp->capacity) > 4) &&
2131                    (sdkp->capacity > 0xffffffffULL)) {
2132                        int old_sector_size = sector_size;
2133                        sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2134                                        "Trying to use READ CAPACITY(16).\n");
2135                        sector_size = read_capacity_16(sdkp, sdp, buffer);
2136                        if (sector_size < 0) {
2137                                sd_printk(KERN_NOTICE, sdkp,
2138                                        "Using 0xffffffff as device size\n");
2139                                sdkp->capacity = 1 + (sector_t) 0xffffffff;
2140                                sector_size = old_sector_size;
2141                                goto got_data;
2142                        }
2143                }
2144        }
2145
2146        /* Some devices are known to return the total number of blocks,
2147         * not the highest block number.  Some devices have versions
2148         * which do this and others which do not.  Some devices we might
2149         * suspect of doing this but we don't know for certain.
2150         *
2151         * If we know the reported capacity is wrong, decrement it.  If
2152         * we can only guess, then assume the number of blocks is even
2153         * (usually true but not always) and err on the side of lowering
2154         * the capacity.
2155         */
2156        if (sdp->fix_capacity ||
2157            (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2158                sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2159                                "from its reported value: %llu\n",
2160                                (unsigned long long) sdkp->capacity);
2161                --sdkp->capacity;
2162        }
2163
2164got_data:
2165        if (sector_size == 0) {
2166                sector_size = 512;
2167                sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2168                          "assuming 512.\n");
2169        }
2170
2171        if (sector_size != 512 &&
2172            sector_size != 1024 &&
2173            sector_size != 2048 &&
2174            sector_size != 4096 &&
2175            sector_size != 256) {
2176                sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2177                          sector_size);
2178                /*
2179                 * The user might want to re-format the drive with
2180                 * a supported sectorsize.  Once this happens, it
2181                 * would be relatively trivial to set the thing up.
2182                 * For this reason, we leave the thing in the table.
2183                 */
2184                sdkp->capacity = 0;
2185                /*
2186                 * set a bogus sector size so the normal read/write
2187                 * logic in the block layer will eventually refuse any
2188                 * request on this device without tripping over power
2189                 * of two sector size assumptions
2190                 */
2191                sector_size = 512;
2192        }
2193        blk_queue_logical_block_size(sdp->request_queue, sector_size);
2194
2195        {
2196                char cap_str_2[10], cap_str_10[10];
2197                u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2198
2199                string_get_size(sz, STRING_UNITS_2, cap_str_2,
2200                                sizeof(cap_str_2));
2201                string_get_size(sz, STRING_UNITS_10, cap_str_10,
2202                                sizeof(cap_str_10));
2203
2204                if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2205                        sd_printk(KERN_NOTICE, sdkp,
2206                                  "%llu %d-byte logical blocks: (%s/%s)\n",
2207                                  (unsigned long long)sdkp->capacity,
2208                                  sector_size, cap_str_10, cap_str_2);
2209
2210                        if (sdkp->physical_block_size != sector_size)
2211                                sd_printk(KERN_NOTICE, sdkp,
2212                                          "%u-byte physical blocks\n",
2213                                          sdkp->physical_block_size);
2214                }
2215        }
2216
2217        sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2218
2219        /* Rescale capacity to 512-byte units */
2220        if (sector_size == 4096)
2221                sdkp->capacity <<= 3;
2222        else if (sector_size == 2048)
2223                sdkp->capacity <<= 2;
2224        else if (sector_size == 1024)
2225                sdkp->capacity <<= 1;
2226        else if (sector_size == 256)
2227                sdkp->capacity >>= 1;
2228
2229        blk_queue_physical_block_size(sdp->request_queue,
2230                                      sdkp->physical_block_size);
2231        sdkp->device->sector_size = sector_size;
2232}
2233
2234/* called with buffer of length 512 */
2235static inline int
2236sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2237                 unsigned char *buffer, int len, struct scsi_mode_data *data,
2238                 struct scsi_sense_hdr *sshdr)
2239{
2240        return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2241                               SD_TIMEOUT, SD_MAX_RETRIES, data,
2242                               sshdr);
2243}
2244
2245/*
2246 * read write protect setting, if possible - called only in sd_revalidate_disk()
2247 * called with buffer of length SD_BUF_SIZE
2248 */
2249static void
2250sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2251{
2252        int res;
2253        struct scsi_device *sdp = sdkp->device;
2254        struct scsi_mode_data data;
2255        int old_wp = sdkp->write_prot;
2256
2257        set_disk_ro(sdkp->disk, 0);
2258        if (sdp->skip_ms_page_3f) {
2259                sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2260                return;
2261        }
2262
2263        if (sdp->use_192_bytes_for_3f) {
2264                res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2265        } else {
2266                /*
2267                 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2268                 * We have to start carefully: some devices hang if we ask
2269                 * for more than is available.
2270                 */
2271                res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2272
2273                /*
2274                 * Second attempt: ask for page 0 When only page 0 is
2275                 * implemented, a request for page 3F may return Sense Key
2276                 * 5: Illegal Request, Sense Code 24: Invalid field in
2277                 * CDB.
2278                 */
2279                if (!scsi_status_is_good(res))
2280                        res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2281
2282                /*
2283                 * Third attempt: ask 255 bytes, as we did earlier.
2284                 */
2285                if (!scsi_status_is_good(res))
2286                        res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2287                                               &data, NULL);
2288        }
2289
2290        if (!scsi_status_is_good(res)) {
2291                sd_printk(KERN_WARNING, sdkp,
2292                          "Test WP failed, assume Write Enabled\n");
2293        } else {
2294                sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2295                set_disk_ro(sdkp->disk, sdkp->write_prot);
2296                if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2297                        sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2298                                  sdkp->write_prot ? "on" : "off");
2299                        sd_printk(KERN_DEBUG, sdkp,
2300                                  "Mode Sense: %02x %02x %02x %02x\n",
2301                                  buffer[0], buffer[1], buffer[2], buffer[3]);
2302                }
2303        }
2304}
2305
2306/*
2307 * sd_read_cache_type - called only from sd_revalidate_disk()
2308 * called with buffer of length SD_BUF_SIZE
2309 */
2310static void
2311sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2312{
2313        int len = 0, res;
2314        struct scsi_device *sdp = sdkp->device;
2315
2316        int dbd;
2317        int modepage;
2318        int first_len;
2319        struct scsi_mode_data data;
2320        struct scsi_sense_hdr sshdr;
2321        int old_wce = sdkp->WCE;
2322        int old_rcd = sdkp->RCD;
2323        int old_dpofua = sdkp->DPOFUA;
2324
2325
2326        if (sdkp->cache_override)
2327                return;
2328
2329        first_len = 4;
2330        if (sdp->skip_ms_page_8) {
2331                if (sdp->type == TYPE_RBC)
2332                        goto defaults;
2333                else {
2334                        if (sdp->skip_ms_page_3f)
2335                                goto defaults;
2336                        modepage = 0x3F;
2337                        if (sdp->use_192_bytes_for_3f)
2338                                first_len = 192;
2339                        dbd = 0;
2340                }
2341        } else if (sdp->type == TYPE_RBC) {
2342                modepage = 6;
2343                dbd = 8;
2344        } else {
2345                modepage = 8;
2346                dbd = 0;
2347        }
2348
2349        /* cautiously ask */
2350        res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2351                        &data, &sshdr);
2352
2353        if (!scsi_status_is_good(res))
2354                goto bad_sense;
2355
2356        if (!data.header_length) {
2357                modepage = 6;
2358                first_len = 0;
2359                sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2360        }
2361
2362        /* that went OK, now ask for the proper length */
2363        len = data.length;
2364
2365        /*
2366         * We're only interested in the first three bytes, actually.
2367         * But the data cache page is defined for the first 20.
2368         */
2369        if (len < 3)
2370                goto bad_sense;
2371        else if (len > SD_BUF_SIZE) {
2372                sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2373                          "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2374                len = SD_BUF_SIZE;
2375        }
2376        if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2377                len = 192;
2378
2379        /* Get the data */
2380        if (len > first_len)
2381                res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2382                                &data, &sshdr);
2383
2384        if (scsi_status_is_good(res)) {
2385                int offset = data.header_length + data.block_descriptor_length;
2386
2387                while (offset < len) {
2388                        u8 page_code = buffer[offset] & 0x3F;
2389                        u8 spf       = buffer[offset] & 0x40;
2390
2391                        if (page_code == 8 || page_code == 6) {
2392                                /* We're interested only in the first 3 bytes.
2393                                 */
2394                                if (len - offset <= 2) {
2395                                        sd_printk(KERN_ERR, sdkp, "Incomplete "
2396                                                  "mode parameter data\n");
2397                                        goto defaults;
2398                                } else {
2399                                        modepage = page_code;
2400                                        goto Page_found;
2401                                }
2402                        } else {
2403                                /* Go to the next page */
2404                                if (spf && len - offset > 3)
2405                                        offset += 4 + (buffer[offset+2] << 8) +
2406                                                buffer[offset+3];
2407                                else if (!spf && len - offset > 1)
2408                                        offset += 2 + buffer[offset+1];
2409                                else {
2410                                        sd_printk(KERN_ERR, sdkp, "Incomplete "
2411                                                  "mode parameter data\n");
2412                                        goto defaults;
2413                                }
2414                        }
2415                }
2416
2417                if (modepage == 0x3F) {
2418                        sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2419                                  "present\n");
2420                        goto defaults;
2421                } else if ((buffer[offset] & 0x3f) != modepage) {
2422                        sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2423                        goto defaults;
2424                }
2425        Page_found:
2426                if (modepage == 8) {
2427                        sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2428                        sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2429                } else {
2430                        sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2431                        sdkp->RCD = 0;
2432                }
2433
2434                sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2435                if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2436                        sd_printk(KERN_NOTICE, sdkp,
2437                                  "Uses READ/WRITE(6), disabling FUA\n");
2438                        sdkp->DPOFUA = 0;
2439                }
2440
2441                if (sdkp->first_scan || old_wce != sdkp->WCE ||
2442                    old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2443                        sd_printk(KERN_NOTICE, sdkp,
2444                                  "Write cache: %s, read cache: %s, %s\n",
2445                                  sdkp->WCE ? "enabled" : "disabled",
2446                                  sdkp->RCD ? "disabled" : "enabled",
2447                                  sdkp->DPOFUA ? "supports DPO and FUA"
2448                                  : "doesn't support DPO or FUA");
2449
2450                return;
2451        }
2452
2453bad_sense:
2454        if (scsi_sense_valid(&sshdr) &&
2455            sshdr.sense_key == ILLEGAL_REQUEST &&
2456            sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2457                /* Invalid field in CDB */
2458                sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2459        else
2460                sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2461
2462defaults:
2463        if (sdp->wce_default_on) {
2464                sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2465                sdkp->WCE = 1;
2466        } else {
2467                sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2468                sdkp->WCE = 0;
2469        }
2470        sdkp->RCD = 0;
2471        sdkp->DPOFUA = 0;
2472}
2473
2474/*
2475 * The ATO bit indicates whether the DIF application tag is available
2476 * for use by the operating system.
2477 */
2478static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2479{
2480        int res, offset;
2481        struct scsi_device *sdp = sdkp->device;
2482        struct scsi_mode_data data;
2483        struct scsi_sense_hdr sshdr;
2484
2485        if (sdp->type != TYPE_DISK)
2486                return;
2487
2488        if (sdkp->protection_type == 0)
2489                return;
2490
2491        res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2492                              SD_MAX_RETRIES, &data, &sshdr);
2493
2494        if (!scsi_status_is_good(res) || !data.header_length ||
2495            data.length < 6) {
2496                sd_printk(KERN_WARNING, sdkp,
2497                          "getting Control mode page failed, assume no ATO\n");
2498
2499                if (scsi_sense_valid(&sshdr))
2500                        sd_print_sense_hdr(sdkp, &sshdr);
2501
2502                return;
2503        }
2504
2505        offset = data.header_length + data.block_descriptor_length;
2506
2507        if ((buffer[offset] & 0x3f) != 0x0a) {
2508                sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2509                return;
2510        }
2511
2512        if ((buffer[offset + 5] & 0x80) == 0)
2513                return;
2514
2515        sdkp->ATO = 1;
2516
2517        return;
2518}
2519
2520/**
2521 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2522 * @disk: disk to query
2523 */
2524static void sd_read_block_limits(struct scsi_disk *sdkp)
2525{
2526        unsigned int sector_sz = sdkp->device->sector_size;
2527        const int vpd_len = 64;
2528        unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2529
2530        if (!buffer ||
2531            /* Block Limits VPD */
2532            scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2533                goto out;
2534
2535        blk_queue_io_min(sdkp->disk->queue,
2536                         get_unaligned_be16(&buffer[6]) * sector_sz);
2537        blk_queue_io_opt(sdkp->disk->queue,
2538                         get_unaligned_be32(&buffer[12]) * sector_sz);
2539
2540        if (buffer[3] == 0x3c) {
2541                unsigned int lba_count, desc_count;
2542
2543                sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2544
2545                if (!sdkp->lbpme)
2546                        goto out;
2547
2548                lba_count = get_unaligned_be32(&buffer[20]);
2549                desc_count = get_unaligned_be32(&buffer[24]);
2550
2551                if (lba_count && desc_count)
2552                        sdkp->max_unmap_blocks = lba_count;
2553
2554                sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2555
2556                if (buffer[32] & 0x80)
2557                        sdkp->unmap_alignment =
2558                                get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2559
2560                if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2561
2562                        if (sdkp->max_unmap_blocks)
2563                                sd_config_discard(sdkp, SD_LBP_UNMAP);
2564                        else
2565                                sd_config_discard(sdkp, SD_LBP_WS16);
2566
2567                } else {        /* LBP VPD page tells us what to use */
2568
2569                        if (sdkp->lbpu && sdkp->max_unmap_blocks)
2570                                sd_config_discard(sdkp, SD_LBP_UNMAP);
2571                        else if (sdkp->lbpws)
2572                                sd_config_discard(sdkp, SD_LBP_WS16);
2573                        else if (sdkp->lbpws10)
2574                                sd_config_discard(sdkp, SD_LBP_WS10);
2575                        else
2576                                sd_config_discard(sdkp, SD_LBP_DISABLE);
2577                }
2578        }
2579
2580 out:
2581        kfree(buffer);
2582}
2583
2584/**
2585 * sd_read_block_characteristics - Query block dev. characteristics
2586 * @disk: disk to query
2587 */
2588static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2589{
2590        unsigned char *buffer;
2591        u16 rot;
2592        const int vpd_len = 64;
2593
2594        buffer = kmalloc(vpd_len, GFP_KERNEL);
2595
2596        if (!buffer ||
2597            /* Block Device Characteristics VPD */
2598            scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2599                goto out;
2600
2601        rot = get_unaligned_be16(&buffer[4]);
2602
2603        if (rot == 1)
2604                queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2605
2606 out:
2607        kfree(buffer);
2608}
2609
2610/**
2611 * sd_read_block_provisioning - Query provisioning VPD page
2612 * @disk: disk to query
2613 */
2614static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2615{
2616        unsigned char *buffer;
2617        const int vpd_len = 8;
2618
2619        if (sdkp->lbpme == 0)
2620                return;
2621
2622        buffer = kmalloc(vpd_len, GFP_KERNEL);
2623
2624        if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2625                goto out;
2626
2627        sdkp->lbpvpd    = 1;
2628        sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2629        sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2630        sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2631
2632 out:
2633        kfree(buffer);
2634}
2635
2636static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2637{
2638        if (scsi_report_opcode(sdkp->device, buffer, SD_BUF_SIZE,
2639                               WRITE_SAME_16))
2640                sdkp->ws16 = 1;
2641}
2642
2643static int sd_try_extended_inquiry(struct scsi_device *sdp)
2644{
2645        /*
2646         * Although VPD inquiries can go to SCSI-2 type devices,
2647         * some USB ones crash on receiving them, and the pages
2648         * we currently ask for are for SPC-3 and beyond
2649         */
2650        if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2651                return 1;
2652        return 0;
2653}
2654
2655/**
2656 *      sd_revalidate_disk - called the first time a new disk is seen,
2657 *      performs disk spin up, read_capacity, etc.
2658 *      @disk: struct gendisk we care about
2659 **/
2660static int sd_revalidate_disk(struct gendisk *disk)
2661{
2662        struct scsi_disk *sdkp = scsi_disk(disk);
2663        struct scsi_device *sdp = sdkp->device;
2664        unsigned char *buffer;
2665        unsigned flush = 0;
2666
2667        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2668                                      "sd_revalidate_disk\n"));
2669
2670        /*
2671         * If the device is offline, don't try and read capacity or any
2672         * of the other niceties.
2673         */
2674        if (!scsi_device_online(sdp))
2675                goto out;
2676
2677        buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2678        if (!buffer) {
2679                sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2680                          "allocation failure.\n");
2681                goto out;
2682        }
2683
2684        sd_spinup_disk(sdkp);
2685
2686        /*
2687         * Without media there is no reason to ask; moreover, some devices
2688         * react badly if we do.
2689         */
2690        if (sdkp->media_present) {
2691                sd_read_capacity(sdkp, buffer);
2692
2693                if (sd_try_extended_inquiry(sdp)) {
2694                        sd_read_block_provisioning(sdkp);
2695                        sd_read_block_limits(sdkp);
2696                        sd_read_block_characteristics(sdkp);
2697                }
2698
2699                sd_read_write_protect_flag(sdkp, buffer);
2700                sd_read_cache_type(sdkp, buffer);
2701                sd_read_app_tag_own(sdkp, buffer);
2702                sd_read_write_same(sdkp, buffer);
2703        }
2704
2705        sdkp->first_scan = 0;
2706
2707        /*
2708         * We now have all cache related info, determine how we deal
2709         * with flush requests.
2710         */
2711        if (sdkp->WCE) {
2712                flush |= REQ_FLUSH;
2713                if (sdkp->DPOFUA)
2714                        flush |= REQ_FUA;
2715        }
2716
2717        blk_queue_flush(sdkp->disk->queue, flush);
2718
2719        set_capacity(disk, sdkp->capacity);
2720        sd_config_write_same(sdkp);
2721        kfree(buffer);
2722
2723 out:
2724        return 0;
2725}
2726
2727/**
2728 *      sd_unlock_native_capacity - unlock native capacity
2729 *      @disk: struct gendisk to set capacity for
2730 *
2731 *      Block layer calls this function if it detects that partitions
2732 *      on @disk reach beyond the end of the device.  If the SCSI host
2733 *      implements ->unlock_native_capacity() method, it's invoked to
2734 *      give it a chance to adjust the device capacity.
2735 *
2736 *      CONTEXT:
2737 *      Defined by block layer.  Might sleep.
2738 */
2739static void sd_unlock_native_capacity(struct gendisk *disk)
2740{
2741        struct scsi_device *sdev = scsi_disk(disk)->device;
2742
2743        if (sdev->host->hostt->unlock_native_capacity)
2744                sdev->host->hostt->unlock_native_capacity(sdev);
2745}
2746
2747/**
2748 *      sd_format_disk_name - format disk name
2749 *      @prefix: name prefix - ie. "sd" for SCSI disks
2750 *      @index: index of the disk to format name for
2751 *      @buf: output buffer
2752 *      @buflen: length of the output buffer
2753 *
2754 *      SCSI disk names starts at sda.  The 26th device is sdz and the
2755 *      27th is sdaa.  The last one for two lettered suffix is sdzz
2756 *      which is followed by sdaaa.
2757 *
2758 *      This is basically 26 base counting with one extra 'nil' entry
2759 *      at the beginning from the second digit on and can be
2760 *      determined using similar method as 26 base conversion with the
2761 *      index shifted -1 after each digit is computed.
2762 *
2763 *      CONTEXT:
2764 *      Don't care.
2765 *
2766 *      RETURNS:
2767 *      0 on success, -errno on failure.
2768 */
2769static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2770{
2771        const int base = 'z' - 'a' + 1;
2772        char *begin = buf + strlen(prefix);
2773        char *end = buf + buflen;
2774        char *p;
2775        int unit;
2776
2777        p = end - 1;
2778        *p = '\0';
2779        unit = base;
2780        do {
2781                if (p == begin)
2782                        return -EINVAL;
2783                *--p = 'a' + (index % unit);
2784                index = (index / unit) - 1;
2785        } while (index >= 0);
2786
2787        memmove(begin, p, end - p);
2788        memcpy(buf, prefix, strlen(prefix));
2789
2790        return 0;
2791}
2792
2793/*
2794 * The asynchronous part of sd_probe
2795 */
2796static void sd_probe_async(void *data, async_cookie_t cookie)
2797{
2798        struct scsi_disk *sdkp = data;
2799        struct scsi_device *sdp;
2800        struct gendisk *gd;
2801        u32 index;
2802        struct device *dev;
2803
2804        sdp = sdkp->device;
2805        gd = sdkp->disk;
2806        index = sdkp->index;
2807        dev = &sdp->sdev_gendev;
2808
2809        gd->major = sd_major((index & 0xf0) >> 4);
2810        gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2811        gd->minors = SD_MINORS;
2812
2813        gd->fops = &sd_fops;
2814        gd->private_data = &sdkp->driver;
2815        gd->queue = sdkp->device->request_queue;
2816
2817        /* defaults, until the device tells us otherwise */
2818        sdp->sector_size = 512;
2819        sdkp->capacity = 0;
2820        sdkp->media_present = 1;
2821        sdkp->write_prot = 0;
2822        sdkp->cache_override = 0;
2823        sdkp->WCE = 0;
2824        sdkp->RCD = 0;
2825        sdkp->ATO = 0;
2826        sdkp->first_scan = 1;
2827        sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2828
2829        sd_revalidate_disk(gd);
2830
2831        blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2832        blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2833
2834        gd->driverfs_dev = &sdp->sdev_gendev;
2835        gd->flags = GENHD_FL_EXT_DEVT;
2836        if (sdp->removable) {
2837                gd->flags |= GENHD_FL_REMOVABLE;
2838                gd->events |= DISK_EVENT_MEDIA_CHANGE;
2839        }
2840
2841        add_disk(gd);
2842        if (sdkp->capacity)
2843                sd_dif_config_host(sdkp);
2844
2845        sd_revalidate_disk(gd);
2846
2847        sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2848                  sdp->removable ? "removable " : "");
2849        blk_pm_runtime_init(sdp->request_queue, dev);
2850        scsi_autopm_put_device(sdp);
2851        put_device(&sdkp->dev);
2852}
2853
2854/**
2855 *      sd_probe - called during driver initialization and whenever a
2856 *      new scsi device is attached to the system. It is called once
2857 *      for each scsi device (not just disks) present.
2858 *      @dev: pointer to device object
2859 *
2860 *      Returns 0 if successful (or not interested in this scsi device 
2861 *      (e.g. scanner)); 1 when there is an error.
2862 *
2863 *      Note: this function is invoked from the scsi mid-level.
2864 *      This function sets up the mapping between a given 
2865 *      <host,channel,id,lun> (found in sdp) and new device name 
2866 *      (e.g. /dev/sda). More precisely it is the block device major 
2867 *      and minor number that is chosen here.
2868 *
2869 *      Assume sd_probe is not re-entrant (for time being)
2870 *      Also think about sd_probe() and sd_remove() running coincidentally.
2871 **/
2872static int sd_probe(struct device *dev)
2873{
2874        struct scsi_device *sdp = to_scsi_device(dev);
2875        struct scsi_disk *sdkp;
2876        struct gendisk *gd;
2877        int index;
2878        int error;
2879
2880        error = -ENODEV;
2881        if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2882                goto out;
2883
2884        SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2885                                        "sd_probe\n"));
2886
2887        error = -ENOMEM;
2888        sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2889        if (!sdkp)
2890                goto out;
2891
2892        gd = alloc_disk(SD_MINORS);
2893        if (!gd)
2894                goto out_free;
2895
2896        do {
2897                if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2898                        goto out_put;
2899
2900                spin_lock(&sd_index_lock);
2901                error = ida_get_new(&sd_index_ida, &index);
2902                spin_unlock(&sd_index_lock);
2903        } while (error == -EAGAIN);
2904
2905        if (error) {
2906                sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2907                goto out_put;
2908        }
2909
2910        error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2911        if (error) {
2912                sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2913                goto out_free_index;
2914        }
2915
2916        sdkp->device = sdp;
2917        sdkp->driver = &sd_template;
2918        sdkp->disk = gd;
2919        sdkp->index = index;
2920        atomic_set(&sdkp->openers, 0);
2921        atomic_set(&sdkp->device->ioerr_cnt, 0);
2922
2923        if (!sdp->request_queue->rq_timeout) {
2924                if (sdp->type != TYPE_MOD)
2925                        blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2926                else
2927                        blk_queue_rq_timeout(sdp->request_queue,
2928                                             SD_MOD_TIMEOUT);
2929        }
2930
2931        device_initialize(&sdkp->dev);
2932        sdkp->dev.parent = dev;
2933        sdkp->dev.class = &sd_disk_class;
2934        dev_set_name(&sdkp->dev, dev_name(dev));
2935
2936        if (device_add(&sdkp->dev))
2937                goto out_free_index;
2938
2939        get_device(dev);
2940        dev_set_drvdata(dev, sdkp);
2941
2942        get_device(&sdkp->dev); /* prevent release before async_schedule */
2943        async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
2944
2945        return 0;
2946
2947 out_free_index:
2948        spin_lock(&sd_index_lock);
2949        ida_remove(&sd_index_ida, index);
2950        spin_unlock(&sd_index_lock);
2951 out_put:
2952        put_disk(gd);
2953 out_free:
2954        kfree(sdkp);
2955 out:
2956        return error;
2957}
2958
2959/**
2960 *      sd_remove - called whenever a scsi disk (previously recognized by
2961 *      sd_probe) is detached from the system. It is called (potentially
2962 *      multiple times) during sd module unload.
2963 *      @sdp: pointer to mid level scsi device object
2964 *
2965 *      Note: this function is invoked from the scsi mid-level.
2966 *      This function potentially frees up a device name (e.g. /dev/sdc)
2967 *      that could be re-used by a subsequent sd_probe().
2968 *      This function is not called when the built-in sd driver is "exit-ed".
2969 **/
2970static int sd_remove(struct device *dev)
2971{
2972        struct scsi_disk *sdkp;
2973
2974        sdkp = dev_get_drvdata(dev);
2975        scsi_autopm_get_device(sdkp->device);
2976
2977        async_synchronize_full_domain(&scsi_sd_probe_domain);
2978        blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2979        blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2980        device_del(&sdkp->dev);
2981        del_gendisk(sdkp->disk);
2982        sd_shutdown(dev);
2983
2984        mutex_lock(&sd_ref_mutex);
2985        dev_set_drvdata(dev, NULL);
2986        put_device(&sdkp->dev);
2987        mutex_unlock(&sd_ref_mutex);
2988
2989        return 0;
2990}
2991
2992/**
2993 *      scsi_disk_release - Called to free the scsi_disk structure
2994 *      @dev: pointer to embedded class device
2995 *
2996 *      sd_ref_mutex must be held entering this routine.  Because it is
2997 *      called on last put, you should always use the scsi_disk_get()
2998 *      scsi_disk_put() helpers which manipulate the semaphore directly
2999 *      and never do a direct put_device.
3000 **/
3001static void scsi_disk_release(struct device *dev)
3002{
3003        struct scsi_disk *sdkp = to_scsi_disk(dev);
3004        struct gendisk *disk = sdkp->disk;
3005        
3006        spin_lock(&sd_index_lock);
3007        ida_remove(&sd_index_ida, sdkp->index);
3008        spin_unlock(&sd_index_lock);
3009
3010        disk->private_data = NULL;
3011        put_disk(disk);
3012        put_device(&sdkp->device->sdev_gendev);
3013
3014        kfree(sdkp);
3015}
3016
3017static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3018{
3019        unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3020        struct scsi_sense_hdr sshdr;
3021        struct scsi_device *sdp = sdkp->device;
3022        int res;
3023
3024        if (start)
3025                cmd[4] |= 1;    /* START */
3026
3027        if (sdp->start_stop_pwr_cond)
3028                cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3029
3030        if (!scsi_device_online(sdp))
3031                return -ENODEV;
3032
3033        res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3034                               SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3035        if (res) {
3036                sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3037                sd_print_result(sdkp, res);
3038                if (driver_byte(res) & DRIVER_SENSE)
3039                        sd_print_sense_hdr(sdkp, &sshdr);
3040        }
3041
3042        return res;
3043}
3044
3045/*
3046 * Send a SYNCHRONIZE CACHE instruction down to the device through
3047 * the normal SCSI command structure.  Wait for the command to
3048 * complete.
3049 */
3050static void sd_shutdown(struct device *dev)
3051{
3052        struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3053
3054        if (!sdkp)
3055                return;         /* this can happen */
3056
3057        if (pm_runtime_suspended(dev))
3058                goto exit;
3059
3060        if (sdkp->WCE) {
3061                sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3062                sd_sync_cache(sdkp);
3063        }
3064
3065        if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3066                sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3067                sd_start_stop_device(sdkp, 0);
3068        }
3069
3070exit:
3071        scsi_disk_put(sdkp);
3072}
3073
3074static int sd_suspend(struct device *dev)
3075{
3076        struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3077        int ret = 0;
3078
3079        if (!sdkp)
3080                return 0;       /* this can happen */
3081
3082        if (sdkp->WCE) {
3083                sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3084                ret = sd_sync_cache(sdkp);
3085                if (ret)
3086                        goto done;
3087        }
3088
3089        if (sdkp->device->manage_start_stop) {
3090                sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3091                ret = sd_start_stop_device(sdkp, 0);
3092        }
3093
3094done:
3095        scsi_disk_put(sdkp);
3096        return ret;
3097}
3098
3099static int sd_resume(struct device *dev)
3100{
3101        struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3102        int ret = 0;
3103
3104        if (!sdkp->device->manage_start_stop)
3105                goto done;
3106
3107        sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3108        ret = sd_start_stop_device(sdkp, 1);
3109
3110done:
3111        scsi_disk_put(sdkp);
3112        return ret;
3113}
3114
3115/**
3116 *      init_sd - entry point for this driver (both when built in or when
3117 *      a module).
3118 *
3119 *      Note: this function registers this driver with the scsi mid-level.
3120 **/
3121static int __init init_sd(void)
3122{
3123        int majors = 0, i, err;
3124
3125        SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3126
3127        for (i = 0; i < SD_MAJORS; i++)
3128                if (register_blkdev(sd_major(i), "sd") == 0)
3129                        majors++;
3130
3131        if (!majors)
3132                return -ENODEV;
3133
3134        err = class_register(&sd_disk_class);
3135        if (err)
3136                goto err_out;
3137
3138        sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3139                                         0, 0, NULL);
3140        if (!sd_cdb_cache) {
3141                printk(KERN_ERR "sd: can't init extended cdb cache\n");
3142                goto err_out_class;
3143        }
3144
3145        sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3146        if (!sd_cdb_pool) {
3147                printk(KERN_ERR "sd: can't init extended cdb pool\n");
3148                goto err_out_cache;
3149        }
3150
3151        err = scsi_register_driver(&sd_template.gendrv);
3152        if (err)
3153                goto err_out_driver;
3154
3155        return 0;
3156
3157err_out_driver:
3158        mempool_destroy(sd_cdb_pool);
3159
3160err_out_cache:
3161        kmem_cache_destroy(sd_cdb_cache);
3162
3163err_out_class:
3164        class_unregister(&sd_disk_class);
3165err_out:
3166        for (i = 0; i < SD_MAJORS; i++)
3167                unregister_blkdev(sd_major(i), "sd");
3168        return err;
3169}
3170
3171/**
3172 *      exit_sd - exit point for this driver (when it is a module).
3173 *
3174 *      Note: this function unregisters this driver from the scsi mid-level.
3175 **/
3176static void __exit exit_sd(void)
3177{
3178        int i;
3179
3180        SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3181
3182        scsi_unregister_driver(&sd_template.gendrv);
3183        mempool_destroy(sd_cdb_pool);
3184        kmem_cache_destroy(sd_cdb_cache);
3185
3186        class_unregister(&sd_disk_class);
3187
3188        for (i = 0; i < SD_MAJORS; i++)
3189                unregister_blkdev(sd_major(i), "sd");
3190}
3191
3192module_init(init_sd);
3193module_exit(exit_sd);
3194
3195static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3196                               struct scsi_sense_hdr *sshdr)
3197{
3198        sd_printk(KERN_INFO, sdkp, " ");
3199        scsi_show_sense_hdr(sshdr);
3200        sd_printk(KERN_INFO, sdkp, " ");
3201        scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3202}
3203
3204static void sd_print_result(struct scsi_disk *sdkp, int result)
3205{
3206        sd_printk(KERN_INFO, sdkp, " ");
3207        scsi_show_result(result);
3208}
3209
3210
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