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        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        retval = scsi_autopm_get_device(sdev);
1140        if (retval)
1141                goto error_autopm;
1142
1143        /*
1144         * If the device is in error recovery, wait until it is done.
1145         * If the device is offline, then disallow any access to it.
1146         */
1147        retval = -ENXIO;
1148        if (!scsi_block_when_processing_errors(sdev))
1149                goto error_out;
1150
1151        if (sdev->removable || sdkp->write_prot)
1152                check_disk_change(bdev);
1153
1154        /*
1155         * If the drive is empty, just let the open fail.
1156         */
1157        retval = -ENOMEDIUM;
1158        if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1159                goto error_out;
1160
1161        /*
1162         * If the device has the write protect tab set, have the open fail
1163         * if the user expects to be able to write to the thing.
1164         */
1165        retval = -EROFS;
1166        if (sdkp->write_prot && (mode & FMODE_WRITE))
1167                goto error_out;
1168
1169        /*
1170         * It is possible that the disk changing stuff resulted in
1171         * the device being taken offline.  If this is the case,
1172         * report this to the user, and don't pretend that the
1173         * open actually succeeded.
1174         */
1175        retval = -ENXIO;
1176        if (!scsi_device_online(sdev))
1177                goto error_out;
1178
1179        if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1180                if (scsi_block_when_processing_errors(sdev))
1181                        scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1182        }
1183
1184        return 0;
1185
1186error_out:
1187        scsi_autopm_put_device(sdev);
1188error_autopm:
1189        scsi_disk_put(sdkp);
1190        return retval;  
1191}
1192
1193/**
1194 *      sd_release - invoked when the (last) close(2) is called on this
1195 *      scsi disk.
1196 *      @inode: only i_rdev member may be used
1197 *      @filp: only f_mode and f_flags may be used
1198 *
1199 *      Returns 0. 
1200 *
1201 *      Note: may block (uninterruptible) if error recovery is underway
1202 *      on this disk.
1203 *
1204 *      Locking: called with bdev->bd_mutex held.
1205 **/
1206static int sd_release(struct gendisk *disk, fmode_t mode)
1207{
1208        struct scsi_disk *sdkp = scsi_disk(disk);
1209        struct scsi_device *sdev = sdkp->device;
1210
1211        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1212
1213        if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1214                if (scsi_block_when_processing_errors(sdev))
1215                        scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1216        }
1217
1218        /*
1219         * XXX and what if there are packets in flight and this close()
1220         * XXX is followed by a "rmmod sd_mod"?
1221         */
1222
1223        scsi_autopm_put_device(sdev);
1224        scsi_disk_put(sdkp);
1225        return 0;
1226}
1227
1228static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1229{
1230        struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1231        struct scsi_device *sdp = sdkp->device;
1232        struct Scsi_Host *host = sdp->host;
1233        int diskinfo[4];
1234
1235        /* default to most commonly used values */
1236        diskinfo[0] = 0x40;     /* 1 << 6 */
1237        diskinfo[1] = 0x20;     /* 1 << 5 */
1238        diskinfo[2] = sdkp->capacity >> 11;
1239        
1240        /* override with calculated, extended default, or driver values */
1241        if (host->hostt->bios_param)
1242                host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1243        else
1244                scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1245
1246        geo->heads = diskinfo[0];
1247        geo->sectors = diskinfo[1];
1248        geo->cylinders = diskinfo[2];
1249        return 0;
1250}
1251
1252/**
1253 *      sd_ioctl - process an ioctl
1254 *      @inode: only i_rdev/i_bdev members may be used
1255 *      @filp: only f_mode and f_flags may be used
1256 *      @cmd: ioctl command number
1257 *      @arg: this is third argument given to ioctl(2) system call.
1258 *      Often contains a pointer.
1259 *
1260 *      Returns 0 if successful (some ioctls return positive numbers on
1261 *      success as well). Returns a negated errno value in case of error.
1262 *
1263 *      Note: most ioctls are forward onto the block subsystem or further
1264 *      down in the scsi subsystem.
1265 **/
1266static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1267                    unsigned int cmd, unsigned long arg)
1268{
1269        struct gendisk *disk = bdev->bd_disk;
1270        struct scsi_disk *sdkp = scsi_disk(disk);
1271        struct scsi_device *sdp = sdkp->device;
1272        void __user *p = (void __user *)arg;
1273        int error;
1274    
1275        SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1276                                    "cmd=0x%x\n", disk->disk_name, cmd));
1277
1278        error = scsi_verify_blk_ioctl(bdev, cmd);
1279        if (error < 0)
1280                return error;
1281
1282        /*
1283         * If we are in the middle of error recovery, don't let anyone
1284         * else try and use this device.  Also, if error recovery fails, it
1285         * may try and take the device offline, in which case all further
1286         * access to the device is prohibited.
1287         */
1288        error = scsi_nonblockable_ioctl(sdp, cmd, p,
1289                                        (mode & FMODE_NDELAY) != 0);
1290        if (!scsi_block_when_processing_errors(sdp) || !error)
1291                goto out;
1292
1293        /*
1294         * Send SCSI addressing ioctls directly to mid level, send other
1295         * ioctls to block level and then onto mid level if they can't be
1296         * resolved.
1297         */
1298        switch (cmd) {
1299                case SCSI_IOCTL_GET_IDLUN:
1300                case SCSI_IOCTL_GET_BUS_NUMBER:
1301                        error = scsi_ioctl(sdp, cmd, p);
1302                        break;
1303                default:
1304                        error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1305                        if (error != -ENOTTY)
1306                                break;
1307                        error = scsi_ioctl(sdp, cmd, p);
1308                        break;
1309        }
1310out:
1311        return error;
1312}
1313
1314static void set_media_not_present(struct scsi_disk *sdkp)
1315{
1316        if (sdkp->media_present)
1317                sdkp->device->changed = 1;
1318
1319        if (sdkp->device->removable) {
1320                sdkp->media_present = 0;
1321                sdkp->capacity = 0;
1322        }
1323}
1324
1325static int media_not_present(struct scsi_disk *sdkp,
1326                             struct scsi_sense_hdr *sshdr)
1327{
1328        if (!scsi_sense_valid(sshdr))
1329                return 0;
1330
1331        /* not invoked for commands that could return deferred errors */
1332        switch (sshdr->sense_key) {
1333        case UNIT_ATTENTION:
1334        case NOT_READY:
1335                /* medium not present */
1336                if (sshdr->asc == 0x3A) {
1337                        set_media_not_present(sdkp);
1338                        return 1;
1339                }
1340        }
1341        return 0;
1342}
1343
1344/**
1345 *      sd_check_events - check media events
1346 *      @disk: kernel device descriptor
1347 *      @clearing: disk events currently being cleared
1348 *
1349 *      Returns mask of DISK_EVENT_*.
1350 *
1351 *      Note: this function is invoked from the block subsystem.
1352 **/
1353static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1354{
1355        struct scsi_disk *sdkp = scsi_disk(disk);
1356        struct scsi_device *sdp = sdkp->device;
1357        struct scsi_sense_hdr *sshdr = NULL;
1358        int retval;
1359
1360        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1361
1362        /*
1363         * If the device is offline, don't send any commands - just pretend as
1364         * if the command failed.  If the device ever comes back online, we
1365         * can deal with it then.  It is only because of unrecoverable errors
1366         * that we would ever take a device offline in the first place.
1367         */
1368        if (!scsi_device_online(sdp)) {
1369                set_media_not_present(sdkp);
1370                goto out;
1371        }
1372
1373        /*
1374         * Using TEST_UNIT_READY enables differentiation between drive with
1375         * no cartridge loaded - NOT READY, drive with changed cartridge -
1376         * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1377         *
1378         * Drives that auto spin down. eg iomega jaz 1G, will be started
1379         * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1380         * sd_revalidate() is called.
1381         */
1382        retval = -ENODEV;
1383
1384        if (scsi_block_when_processing_errors(sdp)) {
1385                retval = scsi_autopm_get_device(sdp);
1386                if (retval)
1387                        goto out;
1388
1389                sshdr  = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1390                retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1391                                              sshdr);
1392                scsi_autopm_put_device(sdp);
1393        }
1394
1395        /* failed to execute TUR, assume media not present */
1396        if (host_byte(retval)) {
1397                set_media_not_present(sdkp);
1398                goto out;
1399        }
1400
1401        if (media_not_present(sdkp, sshdr))
1402                goto out;
1403
1404        /*
1405         * For removable scsi disk we have to recognise the presence
1406         * of a disk in the drive.
1407         */
1408        if (!sdkp->media_present)
1409                sdp->changed = 1;
1410        sdkp->media_present = 1;
1411out:
1412        /*
1413         * sdp->changed is set under the following conditions:
1414         *
1415         *      Medium present state has changed in either direction.
1416         *      Device has indicated UNIT_ATTENTION.
1417         */
1418        kfree(sshdr);
1419        retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1420        sdp->changed = 0;
1421        return retval;
1422}
1423
1424static int sd_sync_cache(struct scsi_disk *sdkp)
1425{
1426        int retries, res;
1427        struct scsi_device *sdp = sdkp->device;
1428        struct scsi_sense_hdr sshdr;
1429
1430        if (!scsi_device_online(sdp))
1431                return -ENODEV;
1432
1433
1434        for (retries = 3; retries > 0; --retries) {
1435                unsigned char cmd[10] = { 0 };
1436
1437                cmd[0] = SYNCHRONIZE_CACHE;
1438                /*
1439                 * Leave the rest of the command zero to indicate
1440                 * flush everything.
1441                 */
1442                res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1443                                       SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1444                if (res == 0)
1445                        break;
1446        }
1447
1448        if (res) {
1449                sd_print_result(sdkp, res);
1450                if (driver_byte(res) & DRIVER_SENSE)
1451                        sd_print_sense_hdr(sdkp, &sshdr);
1452        }
1453
1454        if (res)
1455                return -EIO;
1456        return 0;
1457}
1458
1459static void sd_rescan(struct device *dev)
1460{
1461        struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1462
1463        if (sdkp) {
1464                revalidate_disk(sdkp->disk);
1465                scsi_disk_put(sdkp);
1466        }
1467}
1468
1469
1470#ifdef CONFIG_COMPAT
1471/* 
1472 * This gets directly called from VFS. When the ioctl 
1473 * is not recognized we go back to the other translation paths. 
1474 */
1475static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1476                           unsigned int cmd, unsigned long arg)
1477{
1478        struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1479        int ret;
1480
1481        ret = scsi_verify_blk_ioctl(bdev, cmd);
1482        if (ret < 0)
1483                return ret;
1484
1485        /*
1486         * If we are in the middle of error recovery, don't let anyone
1487         * else try and use this device.  Also, if error recovery fails, it
1488         * may try and take the device offline, in which case all further
1489         * access to the device is prohibited.
1490         */
1491        if (!scsi_block_when_processing_errors(sdev))
1492                return -ENODEV;
1493               
1494        if (sdev->host->hostt->compat_ioctl) {
1495                ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1496
1497                return ret;
1498        }
1499
1500        /* 
1501         * Let the static ioctl translation table take care of it.
1502         */
1503        return -ENOIOCTLCMD; 
1504}
1505#endif
1506
1507static const struct block_device_operations sd_fops = {
1508        .owner                  = THIS_MODULE,
1509        .open                   = sd_open,
1510        .release                = sd_release,
1511        .ioctl                  = sd_ioctl,
1512        .getgeo                 = sd_getgeo,
1513#ifdef CONFIG_COMPAT
1514        .compat_ioctl           = sd_compat_ioctl,
1515#endif
1516        .check_events           = sd_check_events,
1517        .revalidate_disk        = sd_revalidate_disk,
1518        .unlock_native_capacity = sd_unlock_native_capacity,
1519};
1520
1521/**
1522 *      sd_eh_action - error handling callback
1523 *      @scmd:          sd-issued command that has failed
1524 *      @eh_cmnd:       The command that was sent during error handling
1525 *      @eh_cmnd_len:   Length of eh_cmnd in bytes
1526 *      @eh_disp:       The recovery disposition suggested by the midlayer
1527 *
1528 *      This function is called by the SCSI midlayer upon completion of
1529 *      an error handling command (TEST UNIT READY, START STOP UNIT,
1530 *      etc.) The command sent to the device by the error handler is
1531 *      stored in eh_cmnd. The result of sending the eh command is
1532 *      passed in eh_disp.
1533 **/
1534static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1535                        int eh_cmnd_len, int eh_disp)
1536{
1537        struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1538
1539        if (!scsi_device_online(scmd->device) ||
1540            !scsi_medium_access_command(scmd))
1541                return eh_disp;
1542
1543        /*
1544         * The device has timed out executing a medium access command.
1545         * However, the TEST UNIT READY command sent during error
1546         * handling completed successfully. Either the device is in the
1547         * process of recovering or has it suffered an internal failure
1548         * that prevents access to the storage medium.
1549         */
1550        if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1551            eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1552                sdkp->medium_access_timed_out++;
1553
1554        /*
1555         * If the device keeps failing read/write commands but TEST UNIT
1556         * READY always completes successfully we assume that medium
1557         * access is no longer possible and take the device offline.
1558         */
1559        if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1560                scmd_printk(KERN_ERR, scmd,
1561                            "Medium access timeout failure. Offlining disk!\n");
1562                scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1563
1564                return FAILED;
1565        }
1566
1567        return eh_disp;
1568}
1569
1570static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1571{
1572        u64 start_lba = blk_rq_pos(scmd->request);
1573        u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1574        u64 bad_lba;
1575        int info_valid;
1576        /*
1577         * resid is optional but mostly filled in.  When it's unused,
1578         * its value is zero, so we assume the whole buffer transferred
1579         */
1580        unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1581        unsigned int good_bytes;
1582
1583        if (scmd->request->cmd_type != REQ_TYPE_FS)
1584                return 0;
1585
1586        info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1587                                             SCSI_SENSE_BUFFERSIZE,
1588                                             &bad_lba);
1589        if (!info_valid)
1590                return 0;
1591
1592        if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1593                return 0;
1594
1595        if (scmd->device->sector_size < 512) {
1596                /* only legitimate sector_size here is 256 */
1597                start_lba <<= 1;
1598                end_lba <<= 1;
1599        } else {
1600                /* be careful ... don't want any overflows */
1601                u64 factor = scmd->device->sector_size / 512;
1602                do_div(start_lba, factor);
1603                do_div(end_lba, factor);
1604        }
1605
1606        /* The bad lba was reported incorrectly, we have no idea where
1607         * the error is.
1608         */
1609        if (bad_lba < start_lba  || bad_lba >= end_lba)
1610                return 0;
1611
1612        /* This computation should always be done in terms of
1613         * the resolution of the device's medium.
1614         */
1615        good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1616        return min(good_bytes, transferred);
1617}
1618
1619/**
1620 *      sd_done - bottom half handler: called when the lower level
1621 *      driver has completed (successfully or otherwise) a scsi command.
1622 *      @SCpnt: mid-level's per command structure.
1623 *
1624 *      Note: potentially run from within an ISR. Must not block.
1625 **/
1626static int sd_done(struct scsi_cmnd *SCpnt)
1627{
1628        int result = SCpnt->result;
1629        unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1630        struct scsi_sense_hdr sshdr;
1631        struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1632        struct request *req = SCpnt->request;
1633        int sense_valid = 0;
1634        int sense_deferred = 0;
1635        unsigned char op = SCpnt->cmnd[0];
1636        unsigned char unmap = SCpnt->cmnd[1] & 8;
1637
1638        if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1639                if (!result) {
1640                        good_bytes = blk_rq_bytes(req);
1641                        scsi_set_resid(SCpnt, 0);
1642                } else {
1643                        good_bytes = 0;
1644                        scsi_set_resid(SCpnt, blk_rq_bytes(req));
1645                }
1646        }
1647
1648        if (result) {
1649                sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1650                if (sense_valid)
1651                        sense_deferred = scsi_sense_is_deferred(&sshdr);
1652        }
1653#ifdef CONFIG_SCSI_LOGGING
1654        SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1655        if (sense_valid) {
1656                SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1657                                                   "sd_done: sb[respc,sk,asc,"
1658                                                   "ascq]=%x,%x,%x,%x\n",
1659                                                   sshdr.response_code,
1660                                                   sshdr.sense_key, sshdr.asc,
1661                                                   sshdr.ascq));
1662        }
1663#endif
1664        if (driver_byte(result) != DRIVER_SENSE &&
1665            (!sense_valid || sense_deferred))
1666                goto out;
1667
1668        sdkp->medium_access_timed_out = 0;
1669
1670        switch (sshdr.sense_key) {
1671        case HARDWARE_ERROR:
1672        case MEDIUM_ERROR:
1673                good_bytes = sd_completed_bytes(SCpnt);
1674                break;
1675        case RECOVERED_ERROR:
1676                good_bytes = scsi_bufflen(SCpnt);
1677                break;
1678        case NO_SENSE:
1679                /* This indicates a false check condition, so ignore it.  An
1680                 * unknown amount of data was transferred so treat it as an
1681                 * error.
1682                 */
1683                scsi_print_sense("sd", SCpnt);
1684                SCpnt->result = 0;
1685                memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1686                break;
1687        case ABORTED_COMMAND:
1688                if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
1689                        good_bytes = sd_completed_bytes(SCpnt);
1690                break;
1691        case ILLEGAL_REQUEST:
1692                if (sshdr.asc == 0x10)  /* DIX: Host detected corruption */
1693                        good_bytes = sd_completed_bytes(SCpnt);
1694                /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1695                if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1696                        switch (op) {
1697                        case UNMAP:
1698                                sd_config_discard(sdkp, SD_LBP_DISABLE);
1699                                break;
1700                        case WRITE_SAME_16:
1701                        case WRITE_SAME:
1702                                if (unmap)
1703                                        sd_config_discard(sdkp, SD_LBP_DISABLE);
1704                                else {
1705                                        sdkp->device->no_write_same = 1;
1706                                        sd_config_write_same(sdkp);
1707
1708                                        good_bytes = 0;
1709                                        req->__data_len = blk_rq_bytes(req);
1710                                        req->cmd_flags |= REQ_QUIET;
1711                                }
1712                        }
1713                }
1714                break;
1715        default:
1716                break;
1717        }
1718 out:
1719        if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1720                sd_dif_complete(SCpnt, good_bytes);
1721
1722        if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1723            == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1724
1725                /* We have to print a failed command here as the
1726                 * extended CDB gets freed before scsi_io_completion()
1727                 * is called.
1728                 */
1729                if (result)
1730                        scsi_print_command(SCpnt);
1731
1732                mempool_free(SCpnt->cmnd, sd_cdb_pool);
1733                SCpnt->cmnd = NULL;
1734                SCpnt->cmd_len = 0;
1735        }
1736
1737        return good_bytes;
1738}
1739
1740/*
1741 * spinup disk - called only in sd_revalidate_disk()
1742 */
1743static void
1744sd_spinup_disk(struct scsi_disk *sdkp)
1745{
1746        unsigned char cmd[10];
1747        unsigned long spintime_expire = 0;
1748        int retries, spintime;
1749        unsigned int the_result;
1750        struct scsi_sense_hdr sshdr;
1751        int sense_valid = 0;
1752
1753        spintime = 0;
1754
1755        /* Spin up drives, as required.  Only do this at boot time */
1756        /* Spinup needs to be done for module loads too. */
1757        do {
1758                retries = 0;
1759
1760                do {
1761                        cmd[0] = TEST_UNIT_READY;
1762                        memset((void *) &cmd[1], 0, 9);
1763
1764                        the_result = scsi_execute_req(sdkp->device, cmd,
1765                                                      DMA_NONE, NULL, 0,
1766                                                      &sshdr, SD_TIMEOUT,
1767                                                      SD_MAX_RETRIES, NULL);
1768
1769                        /*
1770                         * If the drive has indicated to us that it
1771                         * doesn't have any media in it, don't bother
1772                         * with any more polling.
1773                         */
1774                        if (media_not_present(sdkp, &sshdr))
1775                                return;
1776
1777                        if (the_result)
1778                                sense_valid = scsi_sense_valid(&sshdr);
1779                        retries++;
1780                } while (retries < 3 && 
1781                         (!scsi_status_is_good(the_result) ||
1782                          ((driver_byte(the_result) & DRIVER_SENSE) &&
1783                          sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1784
1785                if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1786                        /* no sense, TUR either succeeded or failed
1787                         * with a status error */
1788                        if(!spintime && !scsi_status_is_good(the_result)) {
1789                                sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1790                                sd_print_result(sdkp, the_result);
1791                        }
1792                        break;
1793                }
1794                                        
1795                /*
1796                 * The device does not want the automatic start to be issued.
1797                 */
1798                if (sdkp->device->no_start_on_add)
1799                        break;
1800
1801                if (sense_valid && sshdr.sense_key == NOT_READY) {
1802                        if (sshdr.asc == 4 && sshdr.ascq == 3)
1803                                break;  /* manual intervention required */
1804                        if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1805                                break;  /* standby */
1806                        if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1807                                break;  /* unavailable */
1808                        /*
1809                         * Issue command to spin up drive when not ready
1810                         */
1811                        if (!spintime) {
1812                                sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1813                                cmd[0] = START_STOP;
1814                                cmd[1] = 1;     /* Return immediately */
1815                                memset((void *) &cmd[2], 0, 8);
1816                                cmd[4] = 1;     /* Start spin cycle */
1817                                if (sdkp->device->start_stop_pwr_cond)
1818                                        cmd[4] |= 1 << 4;
1819                                scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1820                                                 NULL, 0, &sshdr,
1821                                                 SD_TIMEOUT, SD_MAX_RETRIES,
1822                                                 NULL);
1823                                spintime_expire = jiffies + 100 * HZ;
1824                                spintime = 1;
1825                        }
1826                        /* Wait 1 second for next try */
1827                        msleep(1000);
1828                        printk(".");
1829
1830                /*
1831                 * Wait for USB flash devices with slow firmware.
1832                 * Yes, this sense key/ASC combination shouldn't
1833                 * occur here.  It's characteristic of these devices.
1834                 */
1835                } else if (sense_valid &&
1836                                sshdr.sense_key == UNIT_ATTENTION &&
1837                                sshdr.asc == 0x28) {
1838                        if (!spintime) {
1839                                spintime_expire = jiffies + 5 * HZ;
1840                                spintime = 1;
1841                        }
1842                        /* Wait 1 second for next try */
1843                        msleep(1000);
1844                } else {
1845                        /* we don't understand the sense code, so it's
1846                         * probably pointless to loop */
1847                        if(!spintime) {
1848                                sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1849                                sd_print_sense_hdr(sdkp, &sshdr);
1850                        }
1851                        break;
1852                }
1853                                
1854        } while (spintime && time_before_eq(jiffies, spintime_expire));
1855
1856        if (spintime) {
1857                if (scsi_status_is_good(the_result))
1858                        printk("ready\n");
1859                else
1860                        printk("not responding...\n");
1861        }
1862}
1863
1864
1865/*
1866 * Determine whether disk supports Data Integrity Field.
1867 */
1868static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1869{
1870        struct scsi_device *sdp = sdkp->device;
1871        u8 type;
1872        int ret = 0;
1873
1874        if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1875                return ret;
1876
1877        type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1878
1879        if (type > SD_DIF_TYPE3_PROTECTION)
1880                ret = -ENODEV;
1881        else if (scsi_host_dif_capable(sdp->host, type))
1882                ret = 1;
1883
1884        if (sdkp->first_scan || type != sdkp->protection_type)
1885                switch (ret) {
1886                case -ENODEV:
1887                        sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1888                                  " protection type %u. Disabling disk!\n",
1889                                  type);
1890                        break;
1891                case 1:
1892                        sd_printk(KERN_NOTICE, sdkp,
1893                                  "Enabling DIF Type %u protection\n", type);
1894                        break;
1895                case 0:
1896                        sd_printk(KERN_NOTICE, sdkp,
1897                                  "Disabling DIF Type %u protection\n", type);
1898                        break;
1899                }
1900
1901        sdkp->protection_type = type;
1902
1903        return ret;
1904}
1905
1906static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1907                        struct scsi_sense_hdr *sshdr, int sense_valid,
1908                        int the_result)
1909{
1910        sd_print_result(sdkp, the_result);
1911        if (driver_byte(the_result) & DRIVER_SENSE)
1912                sd_print_sense_hdr(sdkp, sshdr);
1913        else
1914                sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1915
1916        /*
1917         * Set dirty bit for removable devices if not ready -
1918         * sometimes drives will not report this properly.
1919         */
1920        if (sdp->removable &&
1921            sense_valid && sshdr->sense_key == NOT_READY)
1922                set_media_not_present(sdkp);
1923
1924        /*
1925         * We used to set media_present to 0 here to indicate no media
1926         * in the drive, but some drives fail read capacity even with
1927         * media present, so we can't do that.
1928         */
1929        sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1930}
1931
1932#define RC16_LEN 32
1933#if RC16_LEN > SD_BUF_SIZE
1934#error RC16_LEN must not be more than SD_BUF_SIZE
1935#endif
1936
1937#define READ_CAPACITY_RETRIES_ON_RESET  10
1938
1939static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1940                                                unsigned char *buffer)
1941{
1942        unsigned char cmd[16];
1943        struct scsi_sense_hdr sshdr;
1944        int sense_valid = 0;
1945        int the_result;
1946        int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1947        unsigned int alignment;
1948        unsigned long long lba;
1949        unsigned sector_size;
1950
1951        if (sdp->no_read_capacity_16)
1952                return -EINVAL;
1953
1954        do {
1955                memset(cmd, 0, 16);
1956                cmd[0] = SERVICE_ACTION_IN;
1957                cmd[1] = SAI_READ_CAPACITY_16;
1958                cmd[13] = RC16_LEN;
1959                memset(buffer, 0, RC16_LEN);
1960
1961                the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1962                                        buffer, RC16_LEN, &sshdr,
1963                                        SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1964
1965                if (media_not_present(sdkp, &sshdr))
1966                        return -ENODEV;
1967
1968                if (the_result) {
1969                        sense_valid = scsi_sense_valid(&sshdr);
1970                        if (sense_valid &&
1971                            sshdr.sense_key == ILLEGAL_REQUEST &&
1972                            (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1973                            sshdr.ascq == 0x00)
1974                                /* Invalid Command Operation Code or
1975                                 * Invalid Field in CDB, just retry
1976                                 * silently with RC10 */
1977                                return -EINVAL;
1978                        if (sense_valid &&
1979                            sshdr.sense_key == UNIT_ATTENTION &&
1980                            sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1981                                /* Device reset might occur several times,
1982                                 * give it one more chance */
1983                                if (--reset_retries > 0)
1984                                        continue;
1985                }
1986                retries--;
1987
1988        } while (the_result && retries);
1989
1990        if (the_result) {
1991                sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1992                read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1993                return -EINVAL;
1994        }
1995
1996        sector_size = get_unaligned_be32(&buffer[8]);
1997        lba = get_unaligned_be64(&buffer[0]);
1998
1999        if (sd_read_protection_type(sdkp, buffer) < 0) {
2000                sdkp->capacity = 0;
2001                return -ENODEV;
2002        }
2003
2004        if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2005                sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2006                        "kernel compiled with support for large block "
2007                        "devices.\n");
2008                sdkp->capacity = 0;
2009                return -EOVERFLOW;
2010        }
2011
2012        /* Logical blocks per physical block exponent */
2013        sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2014
2015        /* Lowest aligned logical block */
2016        alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2017        blk_queue_alignment_offset(sdp->request_queue, alignment);
2018        if (alignment && sdkp->first_scan)
2019                sd_printk(KERN_NOTICE, sdkp,
2020                          "physical block alignment offset: %u\n", alignment);
2021
2022        if (buffer[14] & 0x80) { /* LBPME */
2023                sdkp->lbpme = 1;
2024
2025                if (buffer[14] & 0x40) /* LBPRZ */
2026                        sdkp->lbprz = 1;
2027
2028                sd_config_discard(sdkp, SD_LBP_WS16);
2029        }
2030
2031        sdkp->capacity = lba + 1;
2032        return sector_size;
2033}
2034
2035static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2036                                                unsigned char *buffer)
2037{
2038        unsigned char cmd[16];
2039        struct scsi_sense_hdr sshdr;
2040        int sense_valid = 0;
2041        int the_result;
2042        int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2043        sector_t lba;
2044        unsigned sector_size;
2045
2046        do {
2047                cmd[0] = READ_CAPACITY;
2048                memset(&cmd[1], 0, 9);
2049                memset(buffer, 0, 8);
2050
2051                the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2052                                        buffer, 8, &sshdr,
2053                                        SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2054
2055                if (media_not_present(sdkp, &sshdr))
2056                        return -ENODEV;
2057
2058                if (the_result) {
2059                        sense_valid = scsi_sense_valid(&sshdr);
2060                        if (sense_valid &&
2061                            sshdr.sense_key == UNIT_ATTENTION &&
2062                            sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2063                                /* Device reset might occur several times,
2064                                 * give it one more chance */
2065                                if (--reset_retries > 0)
2066                                        continue;
2067                }
2068                retries--;
2069
2070        } while (the_result && retries);
2071
2072        if (the_result) {
2073                sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2074                read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2075                return -EINVAL;
2076        }
2077
2078        sector_size = get_unaligned_be32(&buffer[4]);
2079        lba = get_unaligned_be32(&buffer[0]);
2080
2081        if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2082                /* Some buggy (usb cardreader) devices return an lba of
2083                   0xffffffff when the want to report a size of 0 (with
2084                   which they really mean no media is present) */
2085                sdkp->capacity = 0;
2086                sdkp->physical_block_size = sector_size;
2087                return sector_size;
2088        }
2089
2090        if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2091                sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2092                        "kernel compiled with support for large block "
2093                        "devices.\n");
2094                sdkp->capacity = 0;
2095                return -EOVERFLOW;
2096        }
2097
2098        sdkp->capacity = lba + 1;
2099        sdkp->physical_block_size = sector_size;
2100        return sector_size;
2101}
2102
2103static int sd_try_rc16_first(struct scsi_device *sdp)
2104{
2105        if (sdp->host->max_cmd_len < 16)
2106                return 0;
2107        if (sdp->try_rc_10_first)
2108                return 0;
2109        if (sdp->scsi_level > SCSI_SPC_2)
2110                return 1;
2111        if (scsi_device_protection(sdp))
2112                return 1;
2113        return 0;
2114}
2115
2116/*
2117 * read disk capacity
2118 */
2119static void
2120sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2121{
2122        int sector_size;
2123        struct scsi_device *sdp = sdkp->device;
2124        sector_t old_capacity = sdkp->capacity;
2125
2126        if (sd_try_rc16_first(sdp)) {
2127                sector_size = read_capacity_16(sdkp, sdp, buffer);
2128                if (sector_size == -EOVERFLOW)
2129                        goto got_data;
2130                if (sector_size == -ENODEV)
2131                        return;
2132                if (sector_size < 0)
2133                        sector_size = read_capacity_10(sdkp, sdp, buffer);
2134                if (sector_size < 0)
2135                        return;
2136        } else {
2137                sector_size = read_capacity_10(sdkp, sdp, buffer);
2138                if (sector_size == -EOVERFLOW)
2139                        goto got_data;
2140                if (sector_size < 0)
2141                        return;
2142                if ((sizeof(sdkp->capacity) > 4) &&
2143                    (sdkp->capacity > 0xffffffffULL)) {
2144                        int old_sector_size = sector_size;
2145                        sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2146                                        "Trying to use READ CAPACITY(16).\n");
2147                        sector_size = read_capacity_16(sdkp, sdp, buffer);
2148                        if (sector_size < 0) {
2149                                sd_printk(KERN_NOTICE, sdkp,
2150                                        "Using 0xffffffff as device size\n");
2151                                sdkp->capacity = 1 + (sector_t) 0xffffffff;
2152                                sector_size = old_sector_size;
2153                                goto got_data;
2154                        }
2155                }
2156        }
2157
2158        /* Some devices are known to return the total number of blocks,
2159         * not the highest block number.  Some devices have versions
2160         * which do this and others which do not.  Some devices we might
2161         * suspect of doing this but we don't know for certain.
2162         *
2163         * If we know the reported capacity is wrong, decrement it.  If
2164         * we can only guess, then assume the number of blocks is even
2165         * (usually true but not always) and err on the side of lowering
2166         * the capacity.
2167         */
2168        if (sdp->fix_capacity ||
2169            (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2170                sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2171                                "from its reported value: %llu\n",
2172                                (unsigned long long) sdkp->capacity);
2173                --sdkp->capacity;
2174        }
2175
2176got_data:
2177        if (sector_size == 0) {
2178                sector_size = 512;
2179                sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2180                          "assuming 512.\n");
2181        }
2182
2183        if (sector_size != 512 &&
2184            sector_size != 1024 &&
2185            sector_size != 2048 &&
2186            sector_size != 4096 &&
2187            sector_size != 256) {
2188                sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2189                          sector_size);
2190                /*
2191                 * The user might want to re-format the drive with
2192                 * a supported sectorsize.  Once this happens, it
2193                 * would be relatively trivial to set the thing up.
2194                 * For this reason, we leave the thing in the table.
2195                 */
2196                sdkp->capacity = 0;
2197                /*
2198                 * set a bogus sector size so the normal read/write
2199                 * logic in the block layer will eventually refuse any
2200                 * request on this device without tripping over power
2201                 * of two sector size assumptions
2202                 */
2203                sector_size = 512;
2204        }
2205        blk_queue_logical_block_size(sdp->request_queue, sector_size);
2206
2207        {
2208                char cap_str_2[10], cap_str_10[10];
2209                u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2210
2211                string_get_size(sz, STRING_UNITS_2, cap_str_2,
2212                                sizeof(cap_str_2));
2213                string_get_size(sz, STRING_UNITS_10, cap_str_10,
2214                                sizeof(cap_str_10));
2215
2216                if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2217                        sd_printk(KERN_NOTICE, sdkp,
2218                                  "%llu %d-byte logical blocks: (%s/%s)\n",
2219                                  (unsigned long long)sdkp->capacity,
2220                                  sector_size, cap_str_10, cap_str_2);
2221
2222                        if (sdkp->physical_block_size != sector_size)
2223                                sd_printk(KERN_NOTICE, sdkp,
2224                                          "%u-byte physical blocks\n",
2225                                          sdkp->physical_block_size);
2226                }
2227        }
2228
2229        sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2230
2231        /* Rescale capacity to 512-byte units */
2232        if (sector_size == 4096)
2233                sdkp->capacity <<= 3;
2234        else if (sector_size == 2048)
2235                sdkp->capacity <<= 2;
2236        else if (sector_size == 1024)
2237                sdkp->capacity <<= 1;
2238        else if (sector_size == 256)
2239                sdkp->capacity >>= 1;
2240
2241        blk_queue_physical_block_size(sdp->request_queue,
2242                                      sdkp->physical_block_size);
2243        sdkp->device->sector_size = sector_size;
2244}
2245
2246/* called with buffer of length 512 */
2247static inline int
2248sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2249                 unsigned char *buffer, int len, struct scsi_mode_data *data,
2250                 struct scsi_sense_hdr *sshdr)
2251{
2252        return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2253                               SD_TIMEOUT, SD_MAX_RETRIES, data,
2254                               sshdr);
2255}
2256
2257/*
2258 * read write protect setting, if possible - called only in sd_revalidate_disk()
2259 * called with buffer of length SD_BUF_SIZE
2260 */
2261static void
2262sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2263{
2264        int res;
2265        struct scsi_device *sdp = sdkp->device;
2266        struct scsi_mode_data data;
2267        int old_wp = sdkp->write_prot;
2268
2269        set_disk_ro(sdkp->disk, 0);
2270        if (sdp->skip_ms_page_3f) {
2271                sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2272                return;
2273        }
2274
2275        if (sdp->use_192_bytes_for_3f) {
2276                res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2277        } else {
2278                /*
2279                 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2280                 * We have to start carefully: some devices hang if we ask
2281                 * for more than is available.
2282                 */
2283                res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2284
2285                /*
2286                 * Second attempt: ask for page 0 When only page 0 is
2287                 * implemented, a request for page 3F may return Sense Key
2288                 * 5: Illegal Request, Sense Code 24: Invalid field in
2289                 * CDB.
2290                 */
2291                if (!scsi_status_is_good(res))
2292                        res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2293
2294                /*
2295                 * Third attempt: ask 255 bytes, as we did earlier.
2296                 */
2297                if (!scsi_status_is_good(res))
2298                        res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2299                                               &data, NULL);
2300        }
2301
2302        if (!scsi_status_is_good(res)) {
2303                sd_printk(KERN_WARNING, sdkp,
2304                          "Test WP failed, assume Write Enabled\n");
2305        } else {
2306                sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2307                set_disk_ro(sdkp->disk, sdkp->write_prot);
2308                if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2309                        sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2310                                  sdkp->write_prot ? "on" : "off");
2311                        sd_printk(KERN_DEBUG, sdkp,
2312                                  "Mode Sense: %02x %02x %02x %02x\n",
2313                                  buffer[0], buffer[1], buffer[2], buffer[3]);
2314                }
2315        }
2316}
2317
2318/*
2319 * sd_read_cache_type - called only from sd_revalidate_disk()
2320 * called with buffer of length SD_BUF_SIZE
2321 */
2322static void
2323sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2324{
2325        int len = 0, res;
2326        struct scsi_device *sdp = sdkp->device;
2327
2328        int dbd;
2329        int modepage;
2330        int first_len;
2331        struct scsi_mode_data data;
2332        struct scsi_sense_hdr sshdr;
2333        int old_wce = sdkp->WCE;
2334        int old_rcd = sdkp->RCD;
2335        int old_dpofua = sdkp->DPOFUA;
2336
2337
2338        if (sdkp->cache_override)
2339                return;
2340
2341        first_len = 4;
2342        if (sdp->skip_ms_page_8) {
2343                if (sdp->type == TYPE_RBC)
2344                        goto defaults;
2345                else {
2346                        if (sdp->skip_ms_page_3f)
2347                                goto defaults;
2348                        modepage = 0x3F;
2349                        if (sdp->use_192_bytes_for_3f)
2350                                first_len = 192;
2351                        dbd = 0;
2352                }
2353        } else if (sdp->type == TYPE_RBC) {
2354                modepage = 6;
2355                dbd = 8;
2356        } else {
2357                modepage = 8;
2358                dbd = 0;
2359        }
2360
2361        /* cautiously ask */
2362        res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2363                        &data, &sshdr);
2364
2365        if (!scsi_status_is_good(res))
2366                goto bad_sense;
2367
2368        if (!data.header_length) {
2369                modepage = 6;
2370                first_len = 0;
2371                sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2372        }
2373
2374        /* that went OK, now ask for the proper length */
2375        len = data.length;
2376
2377        /*
2378         * We're only interested in the first three bytes, actually.
2379         * But the data cache page is defined for the first 20.
2380         */
2381        if (len < 3)
2382                goto bad_sense;
2383        else if (len > SD_BUF_SIZE) {
2384                sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2385                          "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2386                len = SD_BUF_SIZE;
2387        }
2388        if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2389                len = 192;
2390
2391        /* Get the data */
2392        if (len > first_len)
2393                res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2394                                &data, &sshdr);
2395
2396        if (scsi_status_is_good(res)) {
2397                int offset = data.header_length + data.block_descriptor_length;
2398
2399                while (offset < len) {
2400                        u8 page_code = buffer[offset] & 0x3F;
2401                        u8 spf       = buffer[offset] & 0x40;
2402
2403                        if (page_code == 8 || page_code == 6) {
2404                                /* We're interested only in the first 3 bytes.
2405                                 */
2406                                if (len - offset <= 2) {
2407                                        sd_printk(KERN_ERR, sdkp, "Incomplete "
2408                                                  "mode parameter data\n");
2409                                        goto defaults;
2410                                } else {
2411                                        modepage = page_code;
2412                                        goto Page_found;
2413                                }
2414                        } else {
2415                                /* Go to the next page */
2416                                if (spf && len - offset > 3)
2417                                        offset += 4 + (buffer[offset+2] << 8) +
2418                                                buffer[offset+3];
2419                                else if (!spf && len - offset > 1)
2420                                        offset += 2 + buffer[offset+1];
2421                                else {
2422                                        sd_printk(KERN_ERR, sdkp, "Incomplete "
2423                                                  "mode parameter data\n");
2424                                        goto defaults;
2425                                }
2426                        }
2427                }
2428
2429                if (modepage == 0x3F) {
2430                        sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2431                                  "present\n");
2432                        goto defaults;
2433                } else if ((buffer[offset] & 0x3f) != modepage) {
2434                        sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2435                        goto defaults;
2436                }
2437        Page_found:
2438                if (modepage == 8) {
2439                        sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2440                        sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2441                } else {
2442                        sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2443                        sdkp->RCD = 0;
2444                }
2445
2446                sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2447                if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2448                        sd_printk(KERN_NOTICE, sdkp,
2449                                  "Uses READ/WRITE(6), disabling FUA\n");
2450                        sdkp->DPOFUA = 0;
2451                }
2452
2453                if (sdkp->first_scan || old_wce != sdkp->WCE ||
2454                    old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2455                        sd_printk(KERN_NOTICE, sdkp,
2456                                  "Write cache: %s, read cache: %s, %s\n",
2457                                  sdkp->WCE ? "enabled" : "disabled",
2458                                  sdkp->RCD ? "disabled" : "enabled",
2459                                  sdkp->DPOFUA ? "supports DPO and FUA"
2460                                  : "doesn't support DPO or FUA");
2461
2462                return;
2463        }
2464
2465bad_sense:
2466        if (scsi_sense_valid(&sshdr) &&
2467            sshdr.sense_key == ILLEGAL_REQUEST &&
2468            sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2469                /* Invalid field in CDB */
2470                sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2471        else
2472                sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2473
2474defaults:
2475        if (sdp->wce_default_on) {
2476                sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2477                sdkp->WCE = 1;
2478        } else {
2479                sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2480                sdkp->WCE = 0;
2481        }
2482        sdkp->RCD = 0;
2483        sdkp->DPOFUA = 0;
2484}
2485
2486/*
2487 * The ATO bit indicates whether the DIF application tag is available
2488 * for use by the operating system.
2489 */
2490static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2491{
2492        int res, offset;
2493        struct scsi_device *sdp = sdkp->device;
2494        struct scsi_mode_data data;
2495        struct scsi_sense_hdr sshdr;
2496
2497        if (sdp->type != TYPE_DISK)
2498                return;
2499
2500        if (sdkp->protection_type == 0)
2501                return;
2502
2503        res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2504                              SD_MAX_RETRIES, &data, &sshdr);
2505
2506        if (!scsi_status_is_good(res) || !data.header_length ||
2507            data.length < 6) {
2508                sd_printk(KERN_WARNING, sdkp,
2509                          "getting Control mode page failed, assume no ATO\n");
2510
2511                if (scsi_sense_valid(&sshdr))
2512                        sd_print_sense_hdr(sdkp, &sshdr);
2513
2514                return;
2515        }
2516
2517        offset = data.header_length + data.block_descriptor_length;
2518
2519        if ((buffer[offset] & 0x3f) != 0x0a) {
2520                sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2521                return;
2522        }
2523
2524        if ((buffer[offset + 5] & 0x80) == 0)
2525                return;
2526
2527        sdkp->ATO = 1;
2528
2529        return;
2530}
2531
2532/**
2533 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2534 * @disk: disk to query
2535 */
2536static void sd_read_block_limits(struct scsi_disk *sdkp)
2537{
2538        unsigned int sector_sz = sdkp->device->sector_size;
2539        const int vpd_len = 64;
2540        unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2541
2542        if (!buffer ||
2543            /* Block Limits VPD */
2544            scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2545                goto out;
2546
2547        blk_queue_io_min(sdkp->disk->queue,
2548                         get_unaligned_be16(&buffer[6]) * sector_sz);
2549        blk_queue_io_opt(sdkp->disk->queue,
2550                         get_unaligned_be32(&buffer[12]) * sector_sz);
2551
2552        if (buffer[3] == 0x3c) {
2553                unsigned int lba_count, desc_count;
2554
2555                sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2556
2557                if (!sdkp->lbpme)
2558                        goto out;
2559
2560                lba_count = get_unaligned_be32(&buffer[20]);
2561                desc_count = get_unaligned_be32(&buffer[24]);
2562
2563                if (lba_count && desc_count)
2564                        sdkp->max_unmap_blocks = lba_count;
2565
2566                sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2567
2568                if (buffer[32] & 0x80)
2569                        sdkp->unmap_alignment =
2570                                get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2571
2572                if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2573
2574                        if (sdkp->max_unmap_blocks)
2575                                sd_config_discard(sdkp, SD_LBP_UNMAP);
2576                        else
2577                                sd_config_discard(sdkp, SD_LBP_WS16);
2578
2579                } else {        /* LBP VPD page tells us what to use */
2580
2581                        if (sdkp->lbpu && sdkp->max_unmap_blocks)
2582                                sd_config_discard(sdkp, SD_LBP_UNMAP);
2583                        else if (sdkp->lbpws)
2584                                sd_config_discard(sdkp, SD_LBP_WS16);
2585                        else if (sdkp->lbpws10)
2586                                sd_config_discard(sdkp, SD_LBP_WS10);
2587                        else
2588                                sd_config_discard(sdkp, SD_LBP_DISABLE);
2589                }
2590        }
2591
2592 out:
2593        kfree(buffer);
2594}
2595
2596/**
2597 * sd_read_block_characteristics - Query block dev. characteristics
2598 * @disk: disk to query
2599 */
2600static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2601{
2602        unsigned char *buffer;
2603        u16 rot;
2604        const int vpd_len = 64;
2605
2606        buffer = kmalloc(vpd_len, GFP_KERNEL);
2607
2608        if (!buffer ||
2609            /* Block Device Characteristics VPD */
2610            scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2611                goto out;
2612
2613        rot = get_unaligned_be16(&buffer[4]);
2614
2615        if (rot == 1)
2616                queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2617
2618 out:
2619        kfree(buffer);
2620}
2621
2622/**
2623 * sd_read_block_provisioning - Query provisioning VPD page
2624 * @disk: disk to query
2625 */
2626static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2627{
2628        unsigned char *buffer;
2629        const int vpd_len = 8;
2630
2631        if (sdkp->lbpme == 0)
2632                return;
2633
2634        buffer = kmalloc(vpd_len, GFP_KERNEL);
2635
2636        if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2637                goto out;
2638
2639        sdkp->lbpvpd    = 1;
2640        sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2641        sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2642        sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2643
2644 out:
2645        kfree(buffer);
2646}
2647
2648static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2649{
2650        if (scsi_report_opcode(sdkp->device, buffer, SD_BUF_SIZE,
2651                               WRITE_SAME_16))
2652                sdkp->ws16 = 1;
2653}
2654
2655static int sd_try_extended_inquiry(struct scsi_device *sdp)
2656{
2657        /*
2658         * Although VPD inquiries can go to SCSI-2 type devices,
2659         * some USB ones crash on receiving them, and the pages
2660         * we currently ask for are for SPC-3 and beyond
2661         */
2662        if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2663                return 1;
2664        return 0;
2665}
2666
2667/**
2668 *      sd_revalidate_disk - called the first time a new disk is seen,
2669 *      performs disk spin up, read_capacity, etc.
2670 *      @disk: struct gendisk we care about
2671 **/
2672static int sd_revalidate_disk(struct gendisk *disk)
2673{
2674        struct scsi_disk *sdkp = scsi_disk(disk);
2675        struct scsi_device *sdp = sdkp->device;
2676        unsigned char *buffer;
2677        unsigned flush = 0;
2678
2679        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2680                                      "sd_revalidate_disk\n"));
2681
2682        /*
2683         * If the device is offline, don't try and read capacity or any
2684         * of the other niceties.
2685         */
2686        if (!scsi_device_online(sdp))
2687                goto out;
2688
2689        buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2690        if (!buffer) {
2691                sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2692                          "allocation failure.\n");
2693                goto out;
2694        }
2695
2696        sd_spinup_disk(sdkp);
2697
2698        /*
2699         * Without media there is no reason to ask; moreover, some devices
2700         * react badly if we do.
2701         */
2702        if (sdkp->media_present) {
2703                sd_read_capacity(sdkp, buffer);
2704
2705                if (sd_try_extended_inquiry(sdp)) {
2706                        sd_read_block_provisioning(sdkp);
2707                        sd_read_block_limits(sdkp);
2708                        sd_read_block_characteristics(sdkp);
2709                }
2710
2711                sd_read_write_protect_flag(sdkp, buffer);
2712                sd_read_cache_type(sdkp, buffer);
2713                sd_read_app_tag_own(sdkp, buffer);
2714                sd_read_write_same(sdkp, buffer);
2715        }
2716
2717        sdkp->first_scan = 0;
2718
2719        /*
2720         * We now have all cache related info, determine how we deal
2721         * with flush requests.
2722         */
2723        if (sdkp->WCE) {
2724                flush |= REQ_FLUSH;
2725                if (sdkp->DPOFUA)
2726                        flush |= REQ_FUA;
2727        }
2728
2729        blk_queue_flush(sdkp->disk->queue, flush);
2730
2731        set_capacity(disk, sdkp->capacity);
2732        sd_config_write_same(sdkp);
2733        kfree(buffer);
2734
2735 out:
2736        return 0;
2737}
2738
2739/**
2740 *      sd_unlock_native_capacity - unlock native capacity
2741 *      @disk: struct gendisk to set capacity for
2742 *
2743 *      Block layer calls this function if it detects that partitions
2744 *      on @disk reach beyond the end of the device.  If the SCSI host
2745 *      implements ->unlock_native_capacity() method, it's invoked to
2746 *      give it a chance to adjust the device capacity.
2747 *
2748 *      CONTEXT:
2749 *      Defined by block layer.  Might sleep.
2750 */
2751static void sd_unlock_native_capacity(struct gendisk *disk)
2752{
2753        struct scsi_device *sdev = scsi_disk(disk)->device;
2754
2755        if (sdev->host->hostt->unlock_native_capacity)
2756                sdev->host->hostt->unlock_native_capacity(sdev);
2757}
2758
2759/**
2760 *      sd_format_disk_name - format disk name
2761 *      @prefix: name prefix - ie. "sd" for SCSI disks
2762 *      @index: index of the disk to format name for
2763 *      @buf: output buffer
2764 *      @buflen: length of the output buffer
2765 *
2766 *      SCSI disk names starts at sda.  The 26th device is sdz and the
2767 *      27th is sdaa.  The last one for two lettered suffix is sdzz
2768 *      which is followed by sdaaa.
2769 *
2770 *      This is basically 26 base counting with one extra 'nil' entry
2771 *      at the beginning from the second digit on and can be
2772 *      determined using similar method as 26 base conversion with the
2773 *      index shifted -1 after each digit is computed.
2774 *
2775 *      CONTEXT:
2776 *      Don't care.
2777 *
2778 *      RETURNS:
2779 *      0 on success, -errno on failure.
2780 */
2781static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2782{
2783        const int base = 'z' - 'a' + 1;
2784        char *begin = buf + strlen(prefix);
2785        char *end = buf + buflen;
2786        char *p;
2787        int unit;
2788
2789        p = end - 1;
2790        *p = '\0';
2791        unit = base;
2792        do {
2793                if (p == begin)
2794                        return -EINVAL;
2795                *--p = 'a' + (index % unit);
2796                index = (index / unit) - 1;
2797        } while (index >= 0);
2798
2799        memmove(begin, p, end - p);
2800        memcpy(buf, prefix, strlen(prefix));
2801
2802        return 0;
2803}
2804
2805/*
2806 * The asynchronous part of sd_probe
2807 */
2808static void sd_probe_async(void *data, async_cookie_t cookie)
2809{
2810        struct scsi_disk *sdkp = data;
2811        struct scsi_device *sdp;
2812        struct gendisk *gd;
2813        u32 index;
2814        struct device *dev;
2815
2816        sdp = sdkp->device;
2817        gd = sdkp->disk;
2818        index = sdkp->index;
2819        dev = &sdp->sdev_gendev;
2820
2821        gd->major = sd_major((index & 0xf0) >> 4);
2822        gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2823        gd->minors = SD_MINORS;
2824
2825        gd->fops = &sd_fops;
2826        gd->private_data = &sdkp->driver;
2827        gd->queue = sdkp->device->request_queue;
2828
2829        /* defaults, until the device tells us otherwise */
2830        sdp->sector_size = 512;
2831        sdkp->capacity = 0;
2832        sdkp->media_present = 1;
2833        sdkp->write_prot = 0;
2834        sdkp->cache_override = 0;
2835        sdkp->WCE = 0;
2836        sdkp->RCD = 0;
2837        sdkp->ATO = 0;
2838        sdkp->first_scan = 1;
2839        sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2840
2841        sd_revalidate_disk(gd);
2842
2843        blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2844        blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2845
2846        gd->driverfs_dev = &sdp->sdev_gendev;
2847        gd->flags = GENHD_FL_EXT_DEVT;
2848        if (sdp->removable) {
2849                gd->flags |= GENHD_FL_REMOVABLE;
2850                gd->events |= DISK_EVENT_MEDIA_CHANGE;
2851        }
2852
2853        add_disk(gd);
2854        if (sdkp->capacity)
2855                sd_dif_config_host(sdkp);
2856
2857        sd_revalidate_disk(gd);
2858
2859        sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2860                  sdp->removable ? "removable " : "");
2861        scsi_autopm_put_device(sdp);
2862        put_device(&sdkp->dev);
2863}
2864
2865/**
2866 *      sd_probe - called during driver initialization and whenever a
2867 *      new scsi device is attached to the system. It is called once
2868 *      for each scsi device (not just disks) present.
2869 *      @dev: pointer to device object
2870 *
2871 *      Returns 0 if successful (or not interested in this scsi device 
2872 *      (e.g. scanner)); 1 when there is an error.
2873 *
2874 *      Note: this function is invoked from the scsi mid-level.
2875 *      This function sets up the mapping between a given 
2876 *      <host,channel,id,lun> (found in sdp) and new device name 
2877 *      (e.g. /dev/sda). More precisely it is the block device major 
2878 *      and minor number that is chosen here.
2879 *
2880 *      Assume sd_probe is not re-entrant (for time being)
2881 *      Also think about sd_probe() and sd_remove() running coincidentally.
2882 **/
2883static int sd_probe(struct device *dev)
2884{
2885        struct scsi_device *sdp = to_scsi_device(dev);
2886        struct scsi_disk *sdkp;
2887        struct gendisk *gd;
2888        int index;
2889        int error;
2890
2891        error = -ENODEV;
2892        if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2893                goto out;
2894
2895        SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2896                                        "sd_probe\n"));
2897
2898        error = -ENOMEM;
2899        sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2900        if (!sdkp)
2901                goto out;
2902
2903        gd = alloc_disk(SD_MINORS);
2904        if (!gd)
2905                goto out_free;
2906
2907        do {
2908                if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2909                        goto out_put;
2910
2911                spin_lock(&sd_index_lock);
2912                error = ida_get_new(&sd_index_ida, &index);
2913                spin_unlock(&sd_index_lock);
2914        } while (error == -EAGAIN);
2915
2916        if (error) {
2917                sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2918                goto out_put;
2919        }
2920
2921        error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2922        if (error) {
2923                sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2924                goto out_free_index;
2925        }
2926
2927        sdkp->device = sdp;
2928        sdkp->driver = &sd_template;
2929        sdkp->disk = gd;
2930        sdkp->index = index;
2931        atomic_set(&sdkp->openers, 0);
2932        atomic_set(&sdkp->device->ioerr_cnt, 0);
2933
2934        if (!sdp->request_queue->rq_timeout) {
2935                if (sdp->type != TYPE_MOD)
2936                        blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2937                else
2938                        blk_queue_rq_timeout(sdp->request_queue,
2939                                             SD_MOD_TIMEOUT);
2940        }
2941
2942        device_initialize(&sdkp->dev);
2943        sdkp->dev.parent = dev;
2944        sdkp->dev.class = &sd_disk_class;
2945        dev_set_name(&sdkp->dev, dev_name(dev));
2946
2947        if (device_add(&sdkp->dev))
2948                goto out_free_index;
2949
2950        get_device(dev);
2951        dev_set_drvdata(dev, sdkp);
2952
2953        get_device(&sdkp->dev); /* prevent release before async_schedule */
2954        async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
2955
2956        return 0;
2957
2958 out_free_index:
2959        spin_lock(&sd_index_lock);
2960        ida_remove(&sd_index_ida, index);
2961        spin_unlock(&sd_index_lock);
2962 out_put:
2963        put_disk(gd);
2964 out_free:
2965        kfree(sdkp);
2966 out:
2967        return error;
2968}
2969
2970/**
2971 *      sd_remove - called whenever a scsi disk (previously recognized by
2972 *      sd_probe) is detached from the system. It is called (potentially
2973 *      multiple times) during sd module unload.
2974 *      @sdp: pointer to mid level scsi device object
2975 *
2976 *      Note: this function is invoked from the scsi mid-level.
2977 *      This function potentially frees up a device name (e.g. /dev/sdc)
2978 *      that could be re-used by a subsequent sd_probe().
2979 *      This function is not called when the built-in sd driver is "exit-ed".
2980 **/
2981static int sd_remove(struct device *dev)
2982{
2983        struct scsi_disk *sdkp;
2984
2985        sdkp = dev_get_drvdata(dev);
2986        scsi_autopm_get_device(sdkp->device);
2987
2988        async_synchronize_full_domain(&scsi_sd_probe_domain);
2989        blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2990        blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2991        device_del(&sdkp->dev);
2992        del_gendisk(sdkp->disk);
2993        sd_shutdown(dev);
2994
2995        mutex_lock(&sd_ref_mutex);
2996        dev_set_drvdata(dev, NULL);
2997        put_device(&sdkp->dev);
2998        mutex_unlock(&sd_ref_mutex);
2999
3000        return 0;
3001}
3002
3003/**
3004 *      scsi_disk_release - Called to free the scsi_disk structure
3005 *      @dev: pointer to embedded class device
3006 *
3007 *      sd_ref_mutex must be held entering this routine.  Because it is
3008 *      called on last put, you should always use the scsi_disk_get()
3009 *      scsi_disk_put() helpers which manipulate the semaphore directly
3010 *      and never do a direct put_device.
3011 **/
3012static void scsi_disk_release(struct device *dev)
3013{
3014        struct scsi_disk *sdkp = to_scsi_disk(dev);
3015        struct gendisk *disk = sdkp->disk;
3016        
3017        spin_lock(&sd_index_lock);
3018        ida_remove(&sd_index_ida, sdkp->index);
3019        spin_unlock(&sd_index_lock);
3020
3021        disk->private_data = NULL;
3022        put_disk(disk);
3023        put_device(&sdkp->device->sdev_gendev);
3024
3025        kfree(sdkp);
3026}
3027
3028static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3029{
3030        unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3031        struct scsi_sense_hdr sshdr;
3032        struct scsi_device *sdp = sdkp->device;
3033        int res;
3034
3035        if (start)
3036                cmd[4] |= 1;    /* START */
3037
3038        if (sdp->start_stop_pwr_cond)
3039                cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3040
3041        if (!scsi_device_online(sdp))
3042                return -ENODEV;
3043
3044        res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3045                               SD_TIMEOUT, SD_MAX_RETRIES, NULL);
3046        if (res) {
3047                sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3048                sd_print_result(sdkp, res);
3049                if (driver_byte(res) & DRIVER_SENSE)
3050                        sd_print_sense_hdr(sdkp, &sshdr);
3051        }
3052
3053        return res;
3054}
3055
3056/*
3057 * Send a SYNCHRONIZE CACHE instruction down to the device through
3058 * the normal SCSI command structure.  Wait for the command to
3059 * complete.
3060 */
3061static void sd_shutdown(struct device *dev)
3062{
3063        struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3064
3065        if (!sdkp)
3066                return;         /* this can happen */
3067
3068        if (pm_runtime_suspended(dev))
3069                goto exit;
3070
3071        if (sdkp->WCE) {
3072                sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3073                sd_sync_cache(sdkp);
3074        }
3075
3076        if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3077                sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3078                sd_start_stop_device(sdkp, 0);
3079        }
3080
3081exit:
3082        scsi_disk_put(sdkp);
3083}
3084
3085static int sd_suspend(struct device *dev)
3086{
3087        struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3088        int ret = 0;
3089
3090        if (!sdkp)
3091                return 0;       /* this can happen */
3092
3093        if (sdkp->WCE) {
3094                sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3095                ret = sd_sync_cache(sdkp);
3096                if (ret)
3097                        goto done;
3098        }
3099
3100        if (sdkp->device->manage_start_stop) {
3101                sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3102                ret = sd_start_stop_device(sdkp, 0);
3103        }
3104
3105done:
3106        scsi_disk_put(sdkp);
3107        return ret;
3108}
3109
3110static int sd_resume(struct device *dev)
3111{
3112        struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3113        int ret = 0;
3114
3115        if (!sdkp->device->manage_start_stop)
3116                goto done;
3117
3118        sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3119        ret = sd_start_stop_device(sdkp, 1);
3120
3121done:
3122        scsi_disk_put(sdkp);
3123        return ret;
3124}
3125
3126/**
3127 *      init_sd - entry point for this driver (both when built in or when
3128 *      a module).
3129 *
3130 *      Note: this function registers this driver with the scsi mid-level.
3131 **/
3132static int __init init_sd(void)
3133{
3134        int majors = 0, i, err;
3135
3136        SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3137
3138        for (i = 0; i < SD_MAJORS; i++)
3139                if (register_blkdev(sd_major(i), "sd") == 0)
3140                        majors++;
3141
3142        if (!majors)
3143                return -ENODEV;
3144
3145        err = class_register(&sd_disk_class);
3146        if (err)
3147                goto err_out;
3148
3149        sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3150                                         0, 0, NULL);
3151        if (!sd_cdb_cache) {
3152                printk(KERN_ERR "sd: can't init extended cdb cache\n");
3153                goto err_out_class;
3154        }
3155
3156        sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3157        if (!sd_cdb_pool) {
3158                printk(KERN_ERR "sd: can't init extended cdb pool\n");
3159                goto err_out_cache;
3160        }
3161
3162        err = scsi_register_driver(&sd_template.gendrv);
3163        if (err)
3164                goto err_out_driver;
3165
3166        return 0;
3167
3168err_out_driver:
3169        mempool_destroy(sd_cdb_pool);
3170
3171err_out_cache:
3172        kmem_cache_destroy(sd_cdb_cache);
3173
3174err_out_class:
3175        class_unregister(&sd_disk_class);
3176err_out:
3177        for (i = 0; i < SD_MAJORS; i++)
3178                unregister_blkdev(sd_major(i), "sd");
3179        return err;
3180}
3181
3182/**
3183 *      exit_sd - exit point for this driver (when it is a module).
3184 *
3185 *      Note: this function unregisters this driver from the scsi mid-level.
3186 **/
3187static void __exit exit_sd(void)
3188{
3189        int i;
3190
3191        SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3192
3193        scsi_unregister_driver(&sd_template.gendrv);
3194        mempool_destroy(sd_cdb_pool);
3195        kmem_cache_destroy(sd_cdb_cache);
3196
3197        class_unregister(&sd_disk_class);
3198
3199        for (i = 0; i < SD_MAJORS; i++)
3200                unregister_blkdev(sd_major(i), "sd");
3201}
3202
3203module_init(init_sd);
3204module_exit(exit_sd);
3205
3206static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3207                               struct scsi_sense_hdr *sshdr)
3208{
3209        sd_printk(KERN_INFO, sdkp, " ");
3210        scsi_show_sense_hdr(sshdr);
3211        sd_printk(KERN_INFO, sdkp, " ");
3212        scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3213}
3214
3215static void sd_print_result(struct scsi_disk *sdkp, int result)
3216{
3217        sd_printk(KERN_INFO, sdkp, " ");
3218        scsi_show_result(result);
3219}
3220
3221
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