linux/drivers/scsi/sd.c
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   1/*
   2 *      sd.c Copyright (C) 1992 Drew Eckhardt
   3 *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   4 *
   5 *      Linux scsi disk driver
   6 *              Initial versions: Drew Eckhardt
   7 *              Subsequent revisions: Eric Youngdale
   8 *      Modification history:
   9 *       - Drew Eckhardt <drew@colorado.edu> original
  10 *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 
  11 *         outstanding request, and other enhancements.
  12 *         Support loadable low-level scsi drivers.
  13 *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 
  14 *         eight major numbers.
  15 *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
  16 *       - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 
  17 *         sd_init and cleanups.
  18 *       - Alex Davis <letmein@erols.com> Fix problem where partition info
  19 *         not being read in sd_open. Fix problem where removable media 
  20 *         could be ejected after sd_open.
  21 *       - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
  22 *       - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 
  23 *         <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 
  24 *         Support 32k/1M disks.
  25 *
  26 *      Logging policy (needs CONFIG_SCSI_LOGGING defined):
  27 *       - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  28 *       - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  29 *       - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  30 *       - entering other commands: SCSI_LOG_HLQUEUE level 3
  31 *      Note: when the logging level is set by the user, it must be greater
  32 *      than the level indicated above to trigger output.       
  33 */
  34
  35#include <linux/module.h>
  36#include <linux/fs.h>
  37#include <linux/kernel.h>
  38#include <linux/mm.h>
  39#include <linux/bio.h>
  40#include <linux/genhd.h>
  41#include <linux/hdreg.h>
  42#include <linux/errno.h>
  43#include <linux/idr.h>
  44#include <linux/interrupt.h>
  45#include <linux/init.h>
  46#include <linux/blkdev.h>
  47#include <linux/blkpg.h>
  48#include <linux/delay.h>
  49#include <linux/mutex.h>
  50#include <linux/string_helpers.h>
  51#include <linux/async.h>
  52#include <linux/slab.h>
  53#include <linux/pm_runtime.h>
  54#include <asm/uaccess.h>
  55#include <asm/unaligned.h>
  56
  57#include <scsi/scsi.h>
  58#include <scsi/scsi_cmnd.h>
  59#include <scsi/scsi_dbg.h>
  60#include <scsi/scsi_device.h>
  61#include <scsi/scsi_driver.h>
  62#include <scsi/scsi_eh.h>
  63#include <scsi/scsi_host.h>
  64#include <scsi/scsi_ioctl.h>
  65#include <scsi/scsicam.h>
  66
  67#include "sd.h"
  68#include "scsi_priv.h"
  69#include "scsi_logging.h"
  70
  71MODULE_AUTHOR("Eric Youngdale");
  72MODULE_DESCRIPTION("SCSI disk (sd) driver");
  73MODULE_LICENSE("GPL");
  74
  75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  91MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  92MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  93MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  94
  95#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
  96#define SD_MINORS       16
  97#else
  98#define SD_MINORS       0
  99#endif
 100
 101static void sd_config_discard(struct scsi_disk *, unsigned int);
 102static void sd_config_write_same(struct scsi_disk *);
 103static int  sd_revalidate_disk(struct gendisk *);
 104static void sd_unlock_native_capacity(struct gendisk *disk);
 105static int  sd_probe(struct device *);
 106static int  sd_remove(struct device *);
 107static void sd_shutdown(struct device *);
 108static int sd_suspend(struct device *);
 109static int sd_resume(struct device *);
 110static void sd_rescan(struct device *);
 111static int sd_done(struct scsi_cmnd *);
 112static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
 113static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 114static void scsi_disk_release(struct device *cdev);
 115static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 116static void sd_print_result(struct scsi_disk *, int);
 117
 118static DEFINE_SPINLOCK(sd_index_lock);
 119static DEFINE_IDA(sd_index_ida);
 120
 121/* This semaphore is used to mediate the 0->1 reference get in the
 122 * face of object destruction (i.e. we can't allow a get on an
 123 * object after last put) */
 124static DEFINE_MUTEX(sd_ref_mutex);
 125
 126static struct kmem_cache *sd_cdb_cache;
 127static mempool_t *sd_cdb_pool;
 128
 129static const char *sd_cache_types[] = {
 130        "write through", "none", "write back",
 131        "write back, no read (daft)"
 132};
 133
 134static ssize_t
 135sd_store_cache_type(struct device *dev, struct device_attribute *attr,
 136                    const char *buf, size_t count)
 137{
 138        int i, ct = -1, rcd, wce, sp;
 139        struct scsi_disk *sdkp = to_scsi_disk(dev);
 140        struct scsi_device *sdp = sdkp->device;
 141        char buffer[64];
 142        char *buffer_data;
 143        struct scsi_mode_data data;
 144        struct scsi_sense_hdr sshdr;
 145        static const char temp[] = "temporary ";
 146        int len;
 147
 148        if (sdp->type != TYPE_DISK)
 149                /* no cache control on RBC devices; theoretically they
 150                 * can do it, but there's probably so many exceptions
 151                 * it's not worth the risk */
 152                return -EINVAL;
 153
 154        if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 155                buf += sizeof(temp) - 1;
 156                sdkp->cache_override = 1;
 157        } else {
 158                sdkp->cache_override = 0;
 159        }
 160
 161        for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
 162                len = strlen(sd_cache_types[i]);
 163                if (strncmp(sd_cache_types[i], buf, len) == 0 &&
 164                    buf[len] == '\n') {
 165                        ct = i;
 166                        break;
 167                }
 168        }
 169        if (ct < 0)
 170                return -EINVAL;
 171        rcd = ct & 0x01 ? 1 : 0;
 172        wce = ct & 0x02 ? 1 : 0;
 173
 174        if (sdkp->cache_override) {
 175                sdkp->WCE = wce;
 176                sdkp->RCD = rcd;
 177                return count;
 178        }
 179
 180        if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 181                            SD_MAX_RETRIES, &data, NULL))
 182                return -EINVAL;
 183        len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 184                  data.block_descriptor_length);
 185        buffer_data = buffer + data.header_length +
 186                data.block_descriptor_length;
 187        buffer_data[2] &= ~0x05;
 188        buffer_data[2] |= wce << 2 | rcd;
 189        sp = buffer_data[0] & 0x80 ? 1 : 0;
 190
 191        if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 192                             SD_MAX_RETRIES, &data, &sshdr)) {
 193                if (scsi_sense_valid(&sshdr))
 194                        sd_print_sense_hdr(sdkp, &sshdr);
 195                return -EINVAL;
 196        }
 197        revalidate_disk(sdkp->disk);
 198        return count;
 199}
 200
 201static ssize_t
 202sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
 203                           const char *buf, size_t count)
 204{
 205        struct scsi_disk *sdkp = to_scsi_disk(dev);
 206        struct scsi_device *sdp = sdkp->device;
 207
 208        if (!capable(CAP_SYS_ADMIN))
 209                return -EACCES;
 210
 211        sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
 212
 213        return count;
 214}
 215
 216static ssize_t
 217sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
 218                       const char *buf, size_t count)
 219{
 220        struct scsi_disk *sdkp = to_scsi_disk(dev);
 221        struct scsi_device *sdp = sdkp->device;
 222
 223        if (!capable(CAP_SYS_ADMIN))
 224                return -EACCES;
 225
 226        if (sdp->type != TYPE_DISK)
 227                return -EINVAL;
 228
 229        sdp->allow_restart = simple_strtoul(buf, NULL, 10);
 230
 231        return count;
 232}
 233
 234static ssize_t
 235sd_show_cache_type(struct device *dev, struct device_attribute *attr,
 236                   char *buf)
 237{
 238        struct scsi_disk *sdkp = to_scsi_disk(dev);
 239        int ct = sdkp->RCD + 2*sdkp->WCE;
 240
 241        return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
 242}
 243
 244static ssize_t
 245sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
 246{
 247        struct scsi_disk *sdkp = to_scsi_disk(dev);
 248
 249        return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
 250}
 251
 252static ssize_t
 253sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
 254                          char *buf)
 255{
 256        struct scsi_disk *sdkp = to_scsi_disk(dev);
 257        struct scsi_device *sdp = sdkp->device;
 258
 259        return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
 260}
 261
 262static ssize_t
 263sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
 264                      char *buf)
 265{
 266        struct scsi_disk *sdkp = to_scsi_disk(dev);
 267
 268        return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
 269}
 270
 271static ssize_t
 272sd_show_protection_type(struct device *dev, struct device_attribute *attr,
 273                        char *buf)
 274{
 275        struct scsi_disk *sdkp = to_scsi_disk(dev);
 276
 277        return snprintf(buf, 20, "%u\n", sdkp->protection_type);
 278}
 279
 280static ssize_t
 281sd_store_protection_type(struct device *dev, struct device_attribute *attr,
 282                         const char *buf, size_t count)
 283{
 284        struct scsi_disk *sdkp = to_scsi_disk(dev);
 285        unsigned int val;
 286        int err;
 287
 288        if (!capable(CAP_SYS_ADMIN))
 289                return -EACCES;
 290
 291        err = kstrtouint(buf, 10, &val);
 292
 293        if (err)
 294                return err;
 295
 296        if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
 297                sdkp->protection_type = val;
 298
 299        return count;
 300}
 301
 302static ssize_t
 303sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
 304                        char *buf)
 305{
 306        struct scsi_disk *sdkp = to_scsi_disk(dev);
 307        struct scsi_device *sdp = sdkp->device;
 308        unsigned int dif, dix;
 309
 310        dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 311        dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 312
 313        if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
 314                dif = 0;
 315                dix = 1;
 316        }
 317
 318        if (!dif && !dix)
 319                return snprintf(buf, 20, "none\n");
 320
 321        return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
 322}
 323
 324static ssize_t
 325sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
 326                    char *buf)
 327{
 328        struct scsi_disk *sdkp = to_scsi_disk(dev);
 329
 330        return snprintf(buf, 20, "%u\n", sdkp->ATO);
 331}
 332
 333static ssize_t
 334sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
 335                          char *buf)
 336{
 337        struct scsi_disk *sdkp = to_scsi_disk(dev);
 338
 339        return snprintf(buf, 20, "%u\n", sdkp->lbpme);
 340}
 341
 342static const char *lbp_mode[] = {
 343        [SD_LBP_FULL]           = "full",
 344        [SD_LBP_UNMAP]          = "unmap",
 345        [SD_LBP_WS16]           = "writesame_16",
 346        [SD_LBP_WS10]           = "writesame_10",
 347        [SD_LBP_ZERO]           = "writesame_zero",
 348        [SD_LBP_DISABLE]        = "disabled",
 349};
 350
 351static ssize_t
 352sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
 353                          char *buf)
 354{
 355        struct scsi_disk *sdkp = to_scsi_disk(dev);
 356
 357        return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 358}
 359
 360static ssize_t
 361sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
 362                           const char *buf, size_t count)
 363{
 364        struct scsi_disk *sdkp = to_scsi_disk(dev);
 365        struct scsi_device *sdp = sdkp->device;
 366
 367        if (!capable(CAP_SYS_ADMIN))
 368                return -EACCES;
 369
 370        if (sdp->type != TYPE_DISK)
 371                return -EINVAL;
 372
 373        if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
 374                sd_config_discard(sdkp, SD_LBP_UNMAP);
 375        else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
 376                sd_config_discard(sdkp, SD_LBP_WS16);
 377        else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
 378                sd_config_discard(sdkp, SD_LBP_WS10);
 379        else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
 380                sd_config_discard(sdkp, SD_LBP_ZERO);
 381        else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
 382                sd_config_discard(sdkp, SD_LBP_DISABLE);
 383        else
 384                return -EINVAL;
 385
 386        return count;
 387}
 388
 389static ssize_t
 390sd_show_max_medium_access_timeouts(struct device *dev,
 391                                   struct device_attribute *attr, char *buf)
 392{
 393        struct scsi_disk *sdkp = to_scsi_disk(dev);
 394
 395        return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
 396}
 397
 398static ssize_t
 399sd_store_max_medium_access_timeouts(struct device *dev,
 400                                    struct device_attribute *attr,
 401                                    const char *buf, size_t count)
 402{
 403        struct scsi_disk *sdkp = to_scsi_disk(dev);
 404        int err;
 405
 406        if (!capable(CAP_SYS_ADMIN))
 407                return -EACCES;
 408
 409        err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 410
 411        return err ? err : count;
 412}
 413
 414static ssize_t
 415sd_show_write_same_blocks(struct device *dev, struct device_attribute *attr,
 416                          char *buf)
 417{
 418        struct scsi_disk *sdkp = to_scsi_disk(dev);
 419
 420        return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
 421}
 422
 423static ssize_t
 424sd_store_write_same_blocks(struct device *dev, struct device_attribute *attr,
 425                           const char *buf, size_t count)
 426{
 427        struct scsi_disk *sdkp = to_scsi_disk(dev);
 428        struct scsi_device *sdp = sdkp->device;
 429        unsigned long max;
 430        int err;
 431
 432        if (!capable(CAP_SYS_ADMIN))
 433                return -EACCES;
 434
 435        if (sdp->type != TYPE_DISK)
 436                return -EINVAL;
 437
 438        err = kstrtoul(buf, 10, &max);
 439
 440        if (err)
 441                return err;
 442
 443        if (max == 0)
 444                sdp->no_write_same = 1;
 445        else if (max <= SD_MAX_WS16_BLOCKS) {
 446                sdp->no_write_same = 0;
 447                sdkp->max_ws_blocks = max;
 448        }
 449
 450        sd_config_write_same(sdkp);
 451
 452        return count;
 453}
 454
 455static struct device_attribute sd_disk_attrs[] = {
 456        __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
 457               sd_store_cache_type),
 458        __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
 459        __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
 460               sd_store_allow_restart),
 461        __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
 462               sd_store_manage_start_stop),
 463        __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
 464               sd_store_protection_type),
 465        __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
 466        __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
 467        __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
 468        __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
 469               sd_store_provisioning_mode),
 470        __ATTR(max_write_same_blocks, S_IRUGO|S_IWUSR,
 471               sd_show_write_same_blocks, sd_store_write_same_blocks),
 472        __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
 473               sd_show_max_medium_access_timeouts,
 474               sd_store_max_medium_access_timeouts),
 475        __ATTR_NULL,
 476};
 477
 478static struct class sd_disk_class = {
 479        .name           = "scsi_disk",
 480        .owner          = THIS_MODULE,
 481        .dev_release    = scsi_disk_release,
 482        .dev_attrs      = sd_disk_attrs,
 483};
 484
 485static const struct dev_pm_ops sd_pm_ops = {
 486        .suspend                = sd_suspend,
 487        .resume                 = sd_resume,
 488        .poweroff               = sd_suspend,
 489        .restore                = sd_resume,
 490        .runtime_suspend        = sd_suspend,
 491        .runtime_resume         = sd_resume,
 492};
 493
 494static struct scsi_driver sd_template = {
 495        .owner                  = THIS_MODULE,
 496        .gendrv = {
 497                .name           = "sd",
 498                .probe          = sd_probe,
 499                .remove         = sd_remove,
 500                .shutdown       = sd_shutdown,
 501                .pm             = &sd_pm_ops,
 502        },
 503        .rescan                 = sd_rescan,
 504        .done                   = sd_done,
 505        .eh_action              = sd_eh_action,
 506};
 507
 508/*
 509 * Dummy kobj_map->probe function.
 510 * The default ->probe function will call modprobe, which is
 511 * pointless as this module is already loaded.
 512 */
 513static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
 514{
 515        return NULL;
 516}
 517
 518/*
 519 * Device no to disk mapping:
 520 * 
 521 *       major         disc2     disc  p1
 522 *   |............|.............|....|....| <- dev_t
 523 *    31        20 19          8 7  4 3  0
 524 * 
 525 * Inside a major, we have 16k disks, however mapped non-
 526 * contiguously. The first 16 disks are for major0, the next
 527 * ones with major1, ... Disk 256 is for major0 again, disk 272 
 528 * for major1, ... 
 529 * As we stay compatible with our numbering scheme, we can reuse 
 530 * the well-know SCSI majors 8, 65--71, 136--143.
 531 */
 532static int sd_major(int major_idx)
 533{
 534        switch (major_idx) {
 535        case 0:
 536                return SCSI_DISK0_MAJOR;
 537        case 1 ... 7:
 538                return SCSI_DISK1_MAJOR + major_idx - 1;
 539        case 8 ... 15:
 540                return SCSI_DISK8_MAJOR + major_idx - 8;
 541        default:
 542                BUG();
 543                return 0;       /* shut up gcc */
 544        }
 545}
 546
 547static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
 548{
 549        struct scsi_disk *sdkp = NULL;
 550
 551        if (disk->private_data) {
 552                sdkp = scsi_disk(disk);
 553                if (scsi_device_get(sdkp->device) == 0)
 554                        get_device(&sdkp->dev);
 555                else
 556                        sdkp = NULL;
 557        }
 558        return sdkp;
 559}
 560
 561static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 562{
 563        struct scsi_disk *sdkp;
 564
 565        mutex_lock(&sd_ref_mutex);
 566        sdkp = __scsi_disk_get(disk);
 567        mutex_unlock(&sd_ref_mutex);
 568        return sdkp;
 569}
 570
 571static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
 572{
 573        struct scsi_disk *sdkp;
 574
 575        mutex_lock(&sd_ref_mutex);
 576        sdkp = dev_get_drvdata(dev);
 577        if (sdkp)
 578                sdkp = __scsi_disk_get(sdkp->disk);
 579        mutex_unlock(&sd_ref_mutex);
 580        return sdkp;
 581}
 582
 583static void scsi_disk_put(struct scsi_disk *sdkp)
 584{
 585        struct scsi_device *sdev = sdkp->device;
 586
 587        mutex_lock(&sd_ref_mutex);
 588        put_device(&sdkp->dev);
 589        scsi_device_put(sdev);
 590        mutex_unlock(&sd_ref_mutex);
 591}
 592
 593static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
 594{
 595        unsigned int prot_op = SCSI_PROT_NORMAL;
 596        unsigned int dix = scsi_prot_sg_count(scmd);
 597
 598        if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
 599                if (dif && dix)
 600                        prot_op = SCSI_PROT_READ_PASS;
 601                else if (dif && !dix)
 602                        prot_op = SCSI_PROT_READ_STRIP;
 603                else if (!dif && dix)
 604                        prot_op = SCSI_PROT_READ_INSERT;
 605        } else {
 606                if (dif && dix)
 607                        prot_op = SCSI_PROT_WRITE_PASS;
 608                else if (dif && !dix)
 609                        prot_op = SCSI_PROT_WRITE_INSERT;
 610                else if (!dif && dix)
 611                        prot_op = SCSI_PROT_WRITE_STRIP;
 612        }
 613
 614        scsi_set_prot_op(scmd, prot_op);
 615        scsi_set_prot_type(scmd, dif);
 616}
 617
 618static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 619{
 620        struct request_queue *q = sdkp->disk->queue;
 621        unsigned int logical_block_size = sdkp->device->sector_size;
 622        unsigned int max_blocks = 0;
 623
 624        q->limits.discard_zeroes_data = sdkp->lbprz;
 625        q->limits.discard_alignment = sdkp->unmap_alignment *
 626                logical_block_size;
 627        q->limits.discard_granularity =
 628                max(sdkp->physical_block_size,
 629                    sdkp->unmap_granularity * logical_block_size);
 630
 631        sdkp->provisioning_mode = mode;
 632
 633        switch (mode) {
 634
 635        case SD_LBP_DISABLE:
 636                q->limits.max_discard_sectors = 0;
 637                queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
 638                return;
 639
 640        case SD_LBP_UNMAP:
 641                max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 642                                          (u32)SD_MAX_WS16_BLOCKS);
 643                break;
 644
 645        case SD_LBP_WS16:
 646                max_blocks = min_not_zero(sdkp->max_ws_blocks,
 647                                          (u32)SD_MAX_WS16_BLOCKS);
 648                break;
 649
 650        case SD_LBP_WS10:
 651                max_blocks = min_not_zero(sdkp->max_ws_blocks,
 652                                          (u32)SD_MAX_WS10_BLOCKS);
 653                break;
 654
 655        case SD_LBP_ZERO:
 656                max_blocks = min_not_zero(sdkp->max_ws_blocks,
 657                                          (u32)SD_MAX_WS10_BLOCKS);
 658                q->limits.discard_zeroes_data = 1;
 659                break;
 660        }
 661
 662        q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
 663        queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
 664}
 665
 666/**
 667 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
 668 * @sdp: scsi device to operate one
 669 * @rq: Request to prepare
 670 *
 671 * Will issue either UNMAP or WRITE SAME(16) depending on preference
 672 * indicated by target device.
 673 **/
 674static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
 675{
 676        struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 677        sector_t sector = blk_rq_pos(rq);
 678        unsigned int nr_sectors = blk_rq_sectors(rq);
 679        unsigned int nr_bytes = blk_rq_bytes(rq);
 680        unsigned int len;
 681        int ret;
 682        char *buf;
 683        struct page *page;
 684
 685        sector >>= ilog2(sdp->sector_size) - 9;
 686        nr_sectors >>= ilog2(sdp->sector_size) - 9;
 687        rq->timeout = SD_TIMEOUT;
 688
 689        memset(rq->cmd, 0, rq->cmd_len);
 690
 691        page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 692        if (!page)
 693                return BLKPREP_DEFER;
 694
 695        switch (sdkp->provisioning_mode) {
 696        case SD_LBP_UNMAP:
 697                buf = page_address(page);
 698
 699                rq->cmd_len = 10;
 700                rq->cmd[0] = UNMAP;
 701                rq->cmd[8] = 24;
 702
 703                put_unaligned_be16(6 + 16, &buf[0]);
 704                put_unaligned_be16(16, &buf[2]);
 705                put_unaligned_be64(sector, &buf[8]);
 706                put_unaligned_be32(nr_sectors, &buf[16]);
 707
 708                len = 24;
 709                break;
 710
 711        case SD_LBP_WS16:
 712                rq->cmd_len = 16;
 713                rq->cmd[0] = WRITE_SAME_16;
 714                rq->cmd[1] = 0x8; /* UNMAP */
 715                put_unaligned_be64(sector, &rq->cmd[2]);
 716                put_unaligned_be32(nr_sectors, &rq->cmd[10]);
 717
 718                len = sdkp->device->sector_size;
 719                break;
 720
 721        case SD_LBP_WS10:
 722        case SD_LBP_ZERO:
 723                rq->cmd_len = 10;
 724                rq->cmd[0] = WRITE_SAME;
 725                if (sdkp->provisioning_mode == SD_LBP_WS10)
 726                        rq->cmd[1] = 0x8; /* UNMAP */
 727                put_unaligned_be32(sector, &rq->cmd[2]);
 728                put_unaligned_be16(nr_sectors, &rq->cmd[7]);
 729
 730                len = sdkp->device->sector_size;
 731                break;
 732
 733        default:
 734                ret = BLKPREP_KILL;
 735                goto out;
 736        }
 737
 738        blk_add_request_payload(rq, page, len);
 739        ret = scsi_setup_blk_pc_cmnd(sdp, rq);
 740        rq->buffer = page_address(page);
 741        rq->__data_len = nr_bytes;
 742
 743out:
 744        if (ret != BLKPREP_OK) {
 745                __free_page(page);
 746                rq->buffer = NULL;
 747        }
 748        return ret;
 749}
 750
 751static void sd_config_write_same(struct scsi_disk *sdkp)
 752{
 753        struct request_queue *q = sdkp->disk->queue;
 754        unsigned int logical_block_size = sdkp->device->sector_size;
 755
 756        if (sdkp->device->no_write_same) {
 757                sdkp->max_ws_blocks = 0;
 758                goto out;
 759        }
 760
 761        /* Some devices can not handle block counts above 0xffff despite
 762         * supporting WRITE SAME(16). Consequently we default to 64k
 763         * blocks per I/O unless the device explicitly advertises a
 764         * bigger limit.
 765         */
 766        if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 767                sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 768                                                   (u32)SD_MAX_WS16_BLOCKS);
 769        else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 770                sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 771                                                   (u32)SD_MAX_WS10_BLOCKS);
 772        else {
 773                sdkp->device->no_write_same = 1;
 774                sdkp->max_ws_blocks = 0;
 775        }
 776
 777out:
 778        blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
 779                                         (logical_block_size >> 9));
 780}
 781
 782/**
 783 * sd_setup_write_same_cmnd - write the same data to multiple blocks
 784 * @sdp: scsi device to operate one
 785 * @rq: Request to prepare
 786 *
 787 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
 788 * preference indicated by target device.
 789 **/
 790static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
 791{
 792        struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 793        struct bio *bio = rq->bio;
 794        sector_t sector = blk_rq_pos(rq);
 795        unsigned int nr_sectors = blk_rq_sectors(rq);
 796        unsigned int nr_bytes = blk_rq_bytes(rq);
 797        int ret;
 798
 799        if (sdkp->device->no_write_same)
 800                return BLKPREP_KILL;
 801
 802        BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size);
 803
 804        sector >>= ilog2(sdp->sector_size) - 9;
 805        nr_sectors >>= ilog2(sdp->sector_size) - 9;
 806
 807        rq->__data_len = sdp->sector_size;
 808        rq->timeout = SD_WRITE_SAME_TIMEOUT;
 809        memset(rq->cmd, 0, rq->cmd_len);
 810
 811        if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
 812                rq->cmd_len = 16;
 813                rq->cmd[0] = WRITE_SAME_16;
 814                put_unaligned_be64(sector, &rq->cmd[2]);
 815                put_unaligned_be32(nr_sectors, &rq->cmd[10]);
 816        } else {
 817                rq->cmd_len = 10;
 818                rq->cmd[0] = WRITE_SAME;
 819                put_unaligned_be32(sector, &rq->cmd[2]);
 820                put_unaligned_be16(nr_sectors, &rq->cmd[7]);
 821        }
 822
 823        ret = scsi_setup_blk_pc_cmnd(sdp, rq);
 824        rq->__data_len = nr_bytes;
 825
 826        return ret;
 827}
 828
 829static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
 830{
 831        rq->timeout = SD_FLUSH_TIMEOUT;
 832        rq->retries = SD_MAX_RETRIES;
 833        rq->cmd[0] = SYNCHRONIZE_CACHE;
 834        rq->cmd_len = 10;
 835
 836        return scsi_setup_blk_pc_cmnd(sdp, rq);
 837}
 838
 839static void sd_unprep_fn(struct request_queue *q, struct request *rq)
 840{
 841        struct scsi_cmnd *SCpnt = rq->special;
 842
 843        if (rq->cmd_flags & REQ_DISCARD) {
 844                free_page((unsigned long)rq->buffer);
 845                rq->buffer = NULL;
 846        }
 847        if (SCpnt->cmnd != rq->cmd) {
 848                mempool_free(SCpnt->cmnd, sd_cdb_pool);
 849                SCpnt->cmnd = NULL;
 850                SCpnt->cmd_len = 0;
 851        }
 852}
 853
 854/**
 855 *      sd_prep_fn - build a scsi (read or write) command from
 856 *      information in the request structure.
 857 *      @SCpnt: pointer to mid-level's per scsi command structure that
 858 *      contains request and into which the scsi command is written
 859 *
 860 *      Returns 1 if successful and 0 if error (or cannot be done now).
 861 **/
 862static int sd_prep_fn(struct request_queue *q, struct request *rq)
 863{
 864        struct scsi_cmnd *SCpnt;
 865        struct scsi_device *sdp = q->queuedata;
 866        struct gendisk *disk = rq->rq_disk;
 867        struct scsi_disk *sdkp;
 868        sector_t block = blk_rq_pos(rq);
 869        sector_t threshold;
 870        unsigned int this_count = blk_rq_sectors(rq);
 871        int ret, host_dif;
 872        unsigned char protect;
 873
 874        /*
 875         * Discard request come in as REQ_TYPE_FS but we turn them into
 876         * block PC requests to make life easier.
 877         */
 878        if (rq->cmd_flags & REQ_DISCARD) {
 879                ret = sd_setup_discard_cmnd(sdp, rq);
 880                goto out;
 881        } else if (rq->cmd_flags & REQ_WRITE_SAME) {
 882                ret = sd_setup_write_same_cmnd(sdp, rq);
 883                goto out;
 884        } else if (rq->cmd_flags & REQ_FLUSH) {
 885                ret = scsi_setup_flush_cmnd(sdp, rq);
 886                goto out;
 887        } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
 888                ret = scsi_setup_blk_pc_cmnd(sdp, rq);
 889                goto out;
 890        } else if (rq->cmd_type != REQ_TYPE_FS) {
 891                ret = BLKPREP_KILL;
 892                goto out;
 893        }
 894        ret = scsi_setup_fs_cmnd(sdp, rq);
 895        if (ret != BLKPREP_OK)
 896                goto out;
 897        SCpnt = rq->special;
 898        sdkp = scsi_disk(disk);
 899
 900        /* from here on until we're complete, any goto out
 901         * is used for a killable error condition */
 902        ret = BLKPREP_KILL;
 903
 904        SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
 905                                        "sd_prep_fn: block=%llu, "
 906                                        "count=%d\n",
 907                                        (unsigned long long)block,
 908                                        this_count));
 909
 910        if (!sdp || !scsi_device_online(sdp) ||
 911            block + blk_rq_sectors(rq) > get_capacity(disk)) {
 912                SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
 913                                                "Finishing %u sectors\n",
 914                                                blk_rq_sectors(rq)));
 915                SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
 916                                                "Retry with 0x%p\n", SCpnt));
 917                goto out;
 918        }
 919
 920        if (sdp->changed) {
 921                /*
 922                 * quietly refuse to do anything to a changed disc until 
 923                 * the changed bit has been reset
 924                 */
 925                /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
 926                goto out;
 927        }
 928
 929        /*
 930         * Some SD card readers can't handle multi-sector accesses which touch
 931         * the last one or two hardware sectors.  Split accesses as needed.
 932         */
 933        threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
 934                (sdp->sector_size / 512);
 935
 936        if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
 937                if (block < threshold) {
 938                        /* Access up to the threshold but not beyond */
 939                        this_count = threshold - block;
 940                } else {
 941                        /* Access only a single hardware sector */
 942                        this_count = sdp->sector_size / 512;
 943                }
 944        }
 945
 946        SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
 947                                        (unsigned long long)block));
 948
 949        /*
 950         * If we have a 1K hardware sectorsize, prevent access to single
 951         * 512 byte sectors.  In theory we could handle this - in fact
 952         * the scsi cdrom driver must be able to handle this because
 953         * we typically use 1K blocksizes, and cdroms typically have
 954         * 2K hardware sectorsizes.  Of course, things are simpler
 955         * with the cdrom, since it is read-only.  For performance
 956         * reasons, the filesystems should be able to handle this
 957         * and not force the scsi disk driver to use bounce buffers
 958         * for this.
 959         */
 960        if (sdp->sector_size == 1024) {
 961                if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
 962                        scmd_printk(KERN_ERR, SCpnt,
 963                                    "Bad block number requested\n");
 964                        goto out;
 965                } else {
 966                        block = block >> 1;
 967                        this_count = this_count >> 1;
 968                }
 969        }
 970        if (sdp->sector_size == 2048) {
 971                if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
 972                        scmd_printk(KERN_ERR, SCpnt,
 973                                    "Bad block number requested\n");
 974                        goto out;
 975                } else {
 976                        block = block >> 2;
 977                        this_count = this_count >> 2;
 978                }
 979        }
 980        if (sdp->sector_size == 4096) {
 981                if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
 982                        scmd_printk(KERN_ERR, SCpnt,
 983                                    "Bad block number requested\n");
 984                        goto out;
 985                } else {
 986                        block = block >> 3;
 987                        this_count = this_count >> 3;
 988                }
 989        }
 990        if (rq_data_dir(rq) == WRITE) {
 991                if (!sdp->writeable) {
 992                        goto out;
 993                }
 994                SCpnt->cmnd[0] = WRITE_6;
 995                SCpnt->sc_data_direction = DMA_TO_DEVICE;
 996
 997                if (blk_integrity_rq(rq))
 998                        sd_dif_prepare(rq, block, sdp->sector_size);
 999
1000        } else if (rq_data_dir(rq) == READ) {
1001                SCpnt->cmnd[0] = READ_6;
1002                SCpnt->sc_data_direction = DMA_FROM_DEVICE;
1003        } else {
1004                scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
1005                goto out;
1006        }
1007
1008        SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1009                                        "%s %d/%u 512 byte blocks.\n",
1010                                        (rq_data_dir(rq) == WRITE) ?
1011                                        "writing" : "reading", this_count,
1012                                        blk_rq_sectors(rq)));
1013
1014        /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
1015        host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
1016        if (host_dif)
1017                protect = 1 << 5;
1018        else
1019                protect = 0;
1020
1021        if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1022                SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1023
1024                if (unlikely(SCpnt->cmnd == NULL)) {
1025                        ret = BLKPREP_DEFER;
1026                        goto out;
1027                }
1028
1029                SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1030                memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1031                SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1032                SCpnt->cmnd[7] = 0x18;
1033                SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1034                SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1035
1036                /* LBA */
1037                SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1038                SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1039                SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1040                SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1041                SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1042                SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1043                SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1044                SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1045
1046                /* Expected Indirect LBA */
1047                SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1048                SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1049                SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1050                SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1051
1052                /* Transfer length */
1053                SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1054                SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1055                SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1056                SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1057        } else if (sdp->use_16_for_rw) {
1058                SCpnt->cmnd[0] += READ_16 - READ_6;
1059                SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1060                SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1061                SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1062                SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1063                SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1064                SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1065                SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1066                SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1067                SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1068                SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1069                SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1070                SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1071                SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1072                SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1073        } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1074                   scsi_device_protection(SCpnt->device) ||
1075                   SCpnt->device->use_10_for_rw) {
1076                if (this_count > 0xffff)
1077                        this_count = 0xffff;
1078
1079                SCpnt->cmnd[0] += READ_10 - READ_6;
1080                SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1081                SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1082                SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1083                SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1084                SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1085                SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1086                SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1087                SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1088        } else {
1089                if (unlikely(rq->cmd_flags & REQ_FUA)) {
1090                        /*
1091                         * This happens only if this drive failed
1092                         * 10byte rw command with ILLEGAL_REQUEST
1093                         * during operation and thus turned off
1094                         * use_10_for_rw.
1095                         */
1096                        scmd_printk(KERN_ERR, SCpnt,
1097                                    "FUA write on READ/WRITE(6) drive\n");
1098                        goto out;
1099                }
1100
1101                SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1102                SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1103                SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1104                SCpnt->cmnd[4] = (unsigned char) this_count;
1105                SCpnt->cmnd[5] = 0;
1106        }
1107        SCpnt->sdb.length = this_count * sdp->sector_size;
1108
1109        /* If DIF or DIX is enabled, tell HBA how to handle request */
1110        if (host_dif || scsi_prot_sg_count(SCpnt))
1111                sd_prot_op(SCpnt, host_dif);
1112
1113        /*
1114         * We shouldn't disconnect in the middle of a sector, so with a dumb
1115         * host adapter, it's safe to assume that we can at least transfer
1116         * this many bytes between each connect / disconnect.
1117         */
1118        SCpnt->transfersize = sdp->sector_size;
1119        SCpnt->underflow = this_count << 9;
1120        SCpnt->allowed = SD_MAX_RETRIES;
1121
1122        /*
1123         * This indicates that the command is ready from our end to be
1124         * queued.
1125         */
1126        ret = BLKPREP_OK;
1127 out:
1128        return scsi_prep_return(q, rq, ret);
1129}
1130
1131/**
1132 *      sd_open - open a scsi disk device
1133 *      @inode: only i_rdev member may be used
1134 *      @filp: only f_mode and f_flags may be used
1135 *
1136 *      Returns 0 if successful. Returns a negated errno value in case 
1137 *      of error.
1138 *
1139 *      Note: This can be called from a user context (e.g. fsck(1) )
1140 *      or from within the kernel (e.g. as a result of a mount(1) ).
1141 *      In the latter case @inode and @filp carry an abridged amount
1142 *      of information as noted above.
1143 *
1144 *      Locking: called with bdev->bd_mutex held.
1145 **/
1146static int sd_open(struct block_device *bdev, fmode_t mode)
1147{
1148        struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1149        struct scsi_device *sdev;
1150        int retval;
1151
1152        if (!sdkp)
1153                return -ENXIO;
1154
1155        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1156
1157        sdev = sdkp->device;
1158
1159        /*
1160         * If the device is in error recovery, wait until it is done.
1161         * If the device is offline, then disallow any access to it.
1162         */
1163        retval = -ENXIO;
1164        if (!scsi_block_when_processing_errors(sdev))
1165                goto error_out;
1166
1167        if (sdev->removable || sdkp->write_prot)
1168                check_disk_change(bdev);
1169
1170        /*
1171         * If the drive is empty, just let the open fail.
1172         */
1173        retval = -ENOMEDIUM;
1174        if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1175                goto error_out;
1176
1177        /*
1178         * If the device has the write protect tab set, have the open fail
1179         * if the user expects to be able to write to the thing.
1180         */
1181        retval = -EROFS;
1182        if (sdkp->write_prot && (mode & FMODE_WRITE))
1183                goto error_out;
1184
1185        /*
1186         * It is possible that the disk changing stuff resulted in
1187         * the device being taken offline.  If this is the case,
1188         * report this to the user, and don't pretend that the
1189         * open actually succeeded.
1190         */
1191        retval = -ENXIO;
1192        if (!scsi_device_online(sdev))
1193                goto error_out;
1194
1195        if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1196                if (scsi_block_when_processing_errors(sdev))
1197                        scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1198        }
1199
1200        return 0;
1201
1202error_out:
1203        scsi_disk_put(sdkp);
1204        return retval;  
1205}
1206
1207/**
1208 *      sd_release - invoked when the (last) close(2) is called on this
1209 *      scsi disk.
1210 *      @inode: only i_rdev member may be used
1211 *      @filp: only f_mode and f_flags may be used
1212 *
1213 *      Returns 0. 
1214 *
1215 *      Note: may block (uninterruptible) if error recovery is underway
1216 *      on this disk.
1217 *
1218 *      Locking: called with bdev->bd_mutex held.
1219 **/
1220static void sd_release(struct gendisk *disk, fmode_t mode)
1221{
1222        struct scsi_disk *sdkp = scsi_disk(disk);
1223        struct scsi_device *sdev = sdkp->device;
1224
1225        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1226
1227        if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1228                if (scsi_block_when_processing_errors(sdev))
1229                        scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1230        }
1231
1232        /*
1233         * XXX and what if there are packets in flight and this close()
1234         * XXX is followed by a "rmmod sd_mod"?
1235         */
1236
1237        scsi_disk_put(sdkp);
1238}
1239
1240static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1241{
1242        struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1243        struct scsi_device *sdp = sdkp->device;
1244        struct Scsi_Host *host = sdp->host;
1245        int diskinfo[4];
1246
1247        /* default to most commonly used values */
1248        diskinfo[0] = 0x40;     /* 1 << 6 */
1249        diskinfo[1] = 0x20;     /* 1 << 5 */
1250        diskinfo[2] = sdkp->capacity >> 11;
1251        
1252        /* override with calculated, extended default, or driver values */
1253        if (host->hostt->bios_param)
1254                host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1255        else
1256                scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1257
1258        geo->heads = diskinfo[0];
1259        geo->sectors = diskinfo[1];
1260        geo->cylinders = diskinfo[2];
1261        return 0;
1262}
1263
1264/**
1265 *      sd_ioctl - process an ioctl
1266 *      @inode: only i_rdev/i_bdev members may be used
1267 *      @filp: only f_mode and f_flags may be used
1268 *      @cmd: ioctl command number
1269 *      @arg: this is third argument given to ioctl(2) system call.
1270 *      Often contains a pointer.
1271 *
1272 *      Returns 0 if successful (some ioctls return positive numbers on
1273 *      success as well). Returns a negated errno value in case of error.
1274 *
1275 *      Note: most ioctls are forward onto the block subsystem or further
1276 *      down in the scsi subsystem.
1277 **/
1278static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1279                    unsigned int cmd, unsigned long arg)
1280{
1281        struct gendisk *disk = bdev->bd_disk;
1282        struct scsi_disk *sdkp = scsi_disk(disk);
1283        struct scsi_device *sdp = sdkp->device;
1284        void __user *p = (void __user *)arg;
1285        int error;
1286    
1287        SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1288                                    "cmd=0x%x\n", disk->disk_name, cmd));
1289
1290        error = scsi_verify_blk_ioctl(bdev, cmd);
1291        if (error < 0)
1292                return error;
1293
1294        /*
1295         * If we are in the middle of error recovery, don't let anyone
1296         * else try and use this device.  Also, if error recovery fails, it
1297         * may try and take the device offline, in which case all further
1298         * access to the device is prohibited.
1299         */
1300        error = scsi_nonblockable_ioctl(sdp, cmd, p,
1301                                        (mode & FMODE_NDELAY) != 0);
1302        if (!scsi_block_when_processing_errors(sdp) || !error)
1303                goto out;
1304
1305        /*
1306         * Send SCSI addressing ioctls directly to mid level, send other
1307         * ioctls to block level and then onto mid level if they can't be
1308         * resolved.
1309         */
1310        switch (cmd) {
1311                case SCSI_IOCTL_GET_IDLUN:
1312                case SCSI_IOCTL_GET_BUS_NUMBER:
1313                        error = scsi_ioctl(sdp, cmd, p);
1314                        break;
1315                default:
1316                        error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1317                        if (error != -ENOTTY)
1318                                break;
1319                        error = scsi_ioctl(sdp, cmd, p);
1320                        break;
1321        }
1322out:
1323        return error;
1324}
1325
1326static void set_media_not_present(struct scsi_disk *sdkp)
1327{
1328        if (sdkp->media_present)
1329                sdkp->device->changed = 1;
1330
1331        if (sdkp->device->removable) {
1332                sdkp->media_present = 0;
1333                sdkp->capacity = 0;
1334        }
1335}
1336
1337static int media_not_present(struct scsi_disk *sdkp,
1338                             struct scsi_sense_hdr *sshdr)
1339{
1340        if (!scsi_sense_valid(sshdr))
1341                return 0;
1342
1343        /* not invoked for commands that could return deferred errors */
1344        switch (sshdr->sense_key) {
1345        case UNIT_ATTENTION:
1346        case NOT_READY:
1347                /* medium not present */
1348                if (sshdr->asc == 0x3A) {
1349                        set_media_not_present(sdkp);
1350                        return 1;
1351                }
1352        }
1353        return 0;
1354}
1355
1356/**
1357 *      sd_check_events - check media events
1358 *      @disk: kernel device descriptor
1359 *      @clearing: disk events currently being cleared
1360 *
1361 *      Returns mask of DISK_EVENT_*.
1362 *
1363 *      Note: this function is invoked from the block subsystem.
1364 **/
1365static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1366{
1367        struct scsi_disk *sdkp = scsi_disk(disk);
1368        struct scsi_device *sdp = sdkp->device;
1369        struct scsi_sense_hdr *sshdr = NULL;
1370        int retval;
1371
1372        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1373
1374        /*
1375         * If the device is offline, don't send any commands - just pretend as
1376         * if the command failed.  If the device ever comes back online, we
1377         * can deal with it then.  It is only because of unrecoverable errors
1378         * that we would ever take a device offline in the first place.
1379         */
1380        if (!scsi_device_online(sdp)) {
1381                set_media_not_present(sdkp);
1382                goto out;
1383        }
1384
1385        /*
1386         * Using TEST_UNIT_READY enables differentiation between drive with
1387         * no cartridge loaded - NOT READY, drive with changed cartridge -
1388         * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1389         *
1390         * Drives that auto spin down. eg iomega jaz 1G, will be started
1391         * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1392         * sd_revalidate() is called.
1393         */
1394        retval = -ENODEV;
1395
1396        if (scsi_block_when_processing_errors(sdp)) {
1397                sshdr  = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1398                retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1399                                              sshdr);
1400        }
1401
1402        /* failed to execute TUR, assume media not present */
1403        if (host_byte(retval)) {
1404                set_media_not_present(sdkp);
1405                goto out;
1406        }
1407
1408        if (media_not_present(sdkp, sshdr))
1409                goto out;
1410
1411        /*
1412         * For removable scsi disk we have to recognise the presence
1413         * of a disk in the drive.
1414         */
1415        if (!sdkp->media_present)
1416                sdp->changed = 1;
1417        sdkp->media_present = 1;
1418out:
1419        /*
1420         * sdp->changed is set under the following conditions:
1421         *
1422         *      Medium present state has changed in either direction.
1423         *      Device has indicated UNIT_ATTENTION.
1424         */
1425        kfree(sshdr);
1426        retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1427        sdp->changed = 0;
1428        return retval;
1429}
1430
1431static int sd_sync_cache(struct scsi_disk *sdkp)
1432{
1433        int retries, res;
1434        struct scsi_device *sdp = sdkp->device;
1435        struct scsi_sense_hdr sshdr;
1436
1437        if (!scsi_device_online(sdp))
1438                return -ENODEV;
1439
1440
1441        for (retries = 3; retries > 0; --retries) {
1442                unsigned char cmd[10] = { 0 };
1443
1444                cmd[0] = SYNCHRONIZE_CACHE;
1445                /*
1446                 * Leave the rest of the command zero to indicate
1447                 * flush everything.
1448                 */
1449                res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1450                                             &sshdr, SD_FLUSH_TIMEOUT,
1451                                             SD_MAX_RETRIES, NULL, REQ_PM);
1452                if (res == 0)
1453                        break;
1454        }
1455
1456        if (res) {
1457                sd_print_result(sdkp, res);
1458                if (driver_byte(res) & DRIVER_SENSE)
1459                        sd_print_sense_hdr(sdkp, &sshdr);
1460        }
1461
1462        if (res)
1463                return -EIO;
1464        return 0;
1465}
1466
1467static void sd_rescan(struct device *dev)
1468{
1469        struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1470
1471        if (sdkp) {
1472                revalidate_disk(sdkp->disk);
1473                scsi_disk_put(sdkp);
1474        }
1475}
1476
1477
1478#ifdef CONFIG_COMPAT
1479/* 
1480 * This gets directly called from VFS. When the ioctl 
1481 * is not recognized we go back to the other translation paths. 
1482 */
1483static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1484                           unsigned int cmd, unsigned long arg)
1485{
1486        struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1487        int ret;
1488
1489        ret = scsi_verify_blk_ioctl(bdev, cmd);
1490        if (ret < 0)
1491                return ret;
1492
1493        /*
1494         * If we are in the middle of error recovery, don't let anyone
1495         * else try and use this device.  Also, if error recovery fails, it
1496         * may try and take the device offline, in which case all further
1497         * access to the device is prohibited.
1498         */
1499        if (!scsi_block_when_processing_errors(sdev))
1500                return -ENODEV;
1501               
1502        if (sdev->host->hostt->compat_ioctl) {
1503                ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1504
1505                return ret;
1506        }
1507
1508        /* 
1509         * Let the static ioctl translation table take care of it.
1510         */
1511        return -ENOIOCTLCMD; 
1512}
1513#endif
1514
1515static const struct block_device_operations sd_fops = {
1516        .owner                  = THIS_MODULE,
1517        .open                   = sd_open,
1518        .release                = sd_release,
1519        .ioctl                  = sd_ioctl,
1520        .getgeo                 = sd_getgeo,
1521#ifdef CONFIG_COMPAT
1522        .compat_ioctl           = sd_compat_ioctl,
1523#endif
1524        .check_events           = sd_check_events,
1525        .revalidate_disk        = sd_revalidate_disk,
1526        .unlock_native_capacity = sd_unlock_native_capacity,
1527};
1528
1529/**
1530 *      sd_eh_action - error handling callback
1531 *      @scmd:          sd-issued command that has failed
1532 *      @eh_cmnd:       The command that was sent during error handling
1533 *      @eh_cmnd_len:   Length of eh_cmnd in bytes
1534 *      @eh_disp:       The recovery disposition suggested by the midlayer
1535 *
1536 *      This function is called by the SCSI midlayer upon completion of
1537 *      an error handling command (TEST UNIT READY, START STOP UNIT,
1538 *      etc.) The command sent to the device by the error handler is
1539 *      stored in eh_cmnd. The result of sending the eh command is
1540 *      passed in eh_disp.
1541 **/
1542static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1543                        int eh_cmnd_len, int eh_disp)
1544{
1545        struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1546
1547        if (!scsi_device_online(scmd->device) ||
1548            !scsi_medium_access_command(scmd))
1549                return eh_disp;
1550
1551        /*
1552         * The device has timed out executing a medium access command.
1553         * However, the TEST UNIT READY command sent during error
1554         * handling completed successfully. Either the device is in the
1555         * process of recovering or has it suffered an internal failure
1556         * that prevents access to the storage medium.
1557         */
1558        if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1559            eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1560                sdkp->medium_access_timed_out++;
1561
1562        /*
1563         * If the device keeps failing read/write commands but TEST UNIT
1564         * READY always completes successfully we assume that medium
1565         * access is no longer possible and take the device offline.
1566         */
1567        if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1568                scmd_printk(KERN_ERR, scmd,
1569                            "Medium access timeout failure. Offlining disk!\n");
1570                scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1571
1572                return FAILED;
1573        }
1574
1575        return eh_disp;
1576}
1577
1578static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1579{
1580        u64 start_lba = blk_rq_pos(scmd->request);
1581        u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1582        u64 bad_lba;
1583        int info_valid;
1584        /*
1585         * resid is optional but mostly filled in.  When it's unused,
1586         * its value is zero, so we assume the whole buffer transferred
1587         */
1588        unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1589        unsigned int good_bytes;
1590
1591        if (scmd->request->cmd_type != REQ_TYPE_FS)
1592                return 0;
1593
1594        info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1595                                             SCSI_SENSE_BUFFERSIZE,
1596                                             &bad_lba);
1597        if (!info_valid)
1598                return 0;
1599
1600        if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1601                return 0;
1602
1603        if (scmd->device->sector_size < 512) {
1604                /* only legitimate sector_size here is 256 */
1605                start_lba <<= 1;
1606                end_lba <<= 1;
1607        } else {
1608                /* be careful ... don't want any overflows */
1609                u64 factor = scmd->device->sector_size / 512;
1610                do_div(start_lba, factor);
1611                do_div(end_lba, factor);
1612        }
1613
1614        /* The bad lba was reported incorrectly, we have no idea where
1615         * the error is.
1616         */
1617        if (bad_lba < start_lba  || bad_lba >= end_lba)
1618                return 0;
1619
1620        /* This computation should always be done in terms of
1621         * the resolution of the device's medium.
1622         */
1623        good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1624        return min(good_bytes, transferred);
1625}
1626
1627/**
1628 *      sd_done - bottom half handler: called when the lower level
1629 *      driver has completed (successfully or otherwise) a scsi command.
1630 *      @SCpnt: mid-level's per command structure.
1631 *
1632 *      Note: potentially run from within an ISR. Must not block.
1633 **/
1634static int sd_done(struct scsi_cmnd *SCpnt)
1635{
1636        int result = SCpnt->result;
1637        unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1638        struct scsi_sense_hdr sshdr;
1639        struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1640        struct request *req = SCpnt->request;
1641        int sense_valid = 0;
1642        int sense_deferred = 0;
1643        unsigned char op = SCpnt->cmnd[0];
1644        unsigned char unmap = SCpnt->cmnd[1] & 8;
1645
1646        if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1647                if (!result) {
1648                        good_bytes = blk_rq_bytes(req);
1649                        scsi_set_resid(SCpnt, 0);
1650                } else {
1651                        good_bytes = 0;
1652                        scsi_set_resid(SCpnt, blk_rq_bytes(req));
1653                }
1654        }
1655
1656        if (result) {
1657                sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1658                if (sense_valid)
1659                        sense_deferred = scsi_sense_is_deferred(&sshdr);
1660        }
1661#ifdef CONFIG_SCSI_LOGGING
1662        SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1663        if (sense_valid) {
1664                SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1665                                                   "sd_done: sb[respc,sk,asc,"
1666                                                   "ascq]=%x,%x,%x,%x\n",
1667                                                   sshdr.response_code,
1668                                                   sshdr.sense_key, sshdr.asc,
1669                                                   sshdr.ascq));
1670        }
1671#endif
1672        if (driver_byte(result) != DRIVER_SENSE &&
1673            (!sense_valid || sense_deferred))
1674                goto out;
1675
1676        sdkp->medium_access_timed_out = 0;
1677
1678        switch (sshdr.sense_key) {
1679        case HARDWARE_ERROR:
1680        case MEDIUM_ERROR:
1681                good_bytes = sd_completed_bytes(SCpnt);
1682                break;
1683        case RECOVERED_ERROR:
1684                good_bytes = scsi_bufflen(SCpnt);
1685                break;
1686        case NO_SENSE:
1687                /* This indicates a false check condition, so ignore it.  An
1688                 * unknown amount of data was transferred so treat it as an
1689                 * error.
1690                 */
1691                scsi_print_sense("sd", SCpnt);
1692                SCpnt->result = 0;
1693                memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1694                break;
1695        case ABORTED_COMMAND:
1696                if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
1697                        good_bytes = sd_completed_bytes(SCpnt);
1698                break;
1699        case ILLEGAL_REQUEST:
1700                if (sshdr.asc == 0x10)  /* DIX: Host detected corruption */
1701                        good_bytes = sd_completed_bytes(SCpnt);
1702                /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1703                if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1704                        switch (op) {
1705                        case UNMAP:
1706                                sd_config_discard(sdkp, SD_LBP_DISABLE);
1707                                break;
1708                        case WRITE_SAME_16:
1709                        case WRITE_SAME:
1710                                if (unmap)
1711                                        sd_config_discard(sdkp, SD_LBP_DISABLE);
1712                                else {
1713                                        sdkp->device->no_write_same = 1;
1714                                        sd_config_write_same(sdkp);
1715
1716                                        good_bytes = 0;
1717                                        req->__data_len = blk_rq_bytes(req);
1718                                        req->cmd_flags |= REQ_QUIET;
1719                                }
1720                        }
1721                }
1722                break;
1723        default:
1724                break;
1725        }
1726 out:
1727        if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1728                sd_dif_complete(SCpnt, good_bytes);
1729
1730        return good_bytes;
1731}
1732
1733/*
1734 * spinup disk - called only in sd_revalidate_disk()
1735 */
1736static void
1737sd_spinup_disk(struct scsi_disk *sdkp)
1738{
1739        unsigned char cmd[10];
1740        unsigned long spintime_expire = 0;
1741        int retries, spintime;
1742        unsigned int the_result;
1743        struct scsi_sense_hdr sshdr;
1744        int sense_valid = 0;
1745
1746        spintime = 0;
1747
1748        /* Spin up drives, as required.  Only do this at boot time */
1749        /* Spinup needs to be done for module loads too. */
1750        do {
1751                retries = 0;
1752
1753                do {
1754                        cmd[0] = TEST_UNIT_READY;
1755                        memset((void *) &cmd[1], 0, 9);
1756
1757                        the_result = scsi_execute_req(sdkp->device, cmd,
1758                                                      DMA_NONE, NULL, 0,
1759                                                      &sshdr, SD_TIMEOUT,
1760                                                      SD_MAX_RETRIES, NULL);
1761
1762                        /*
1763                         * If the drive has indicated to us that it
1764                         * doesn't have any media in it, don't bother
1765                         * with any more polling.
1766                         */
1767                        if (media_not_present(sdkp, &sshdr))
1768                                return;
1769
1770                        if (the_result)
1771                                sense_valid = scsi_sense_valid(&sshdr);
1772                        retries++;
1773                } while (retries < 3 && 
1774                         (!scsi_status_is_good(the_result) ||
1775                          ((driver_byte(the_result) & DRIVER_SENSE) &&
1776                          sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1777
1778                if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1779                        /* no sense, TUR either succeeded or failed
1780                         * with a status error */
1781                        if(!spintime && !scsi_status_is_good(the_result)) {
1782                                sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1783                                sd_print_result(sdkp, the_result);
1784                        }
1785                        break;
1786                }
1787                                        
1788                /*
1789                 * The device does not want the automatic start to be issued.
1790                 */
1791                if (sdkp->device->no_start_on_add)
1792                        break;
1793
1794                if (sense_valid && sshdr.sense_key == NOT_READY) {
1795                        if (sshdr.asc == 4 && sshdr.ascq == 3)
1796                                break;  /* manual intervention required */
1797                        if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1798                                break;  /* standby */
1799                        if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1800                                break;  /* unavailable */
1801                        /*
1802                         * Issue command to spin up drive when not ready
1803                         */
1804                        if (!spintime) {
1805                                sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1806                                cmd[0] = START_STOP;
1807                                cmd[1] = 1;     /* Return immediately */
1808                                memset((void *) &cmd[2], 0, 8);
1809                                cmd[4] = 1;     /* Start spin cycle */
1810                                if (sdkp->device->start_stop_pwr_cond)
1811                                        cmd[4] |= 1 << 4;
1812                                scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1813                                                 NULL, 0, &sshdr,
1814                                                 SD_TIMEOUT, SD_MAX_RETRIES,
1815                                                 NULL);
1816                                spintime_expire = jiffies + 100 * HZ;
1817                                spintime = 1;
1818                        }
1819                        /* Wait 1 second for next try */
1820                        msleep(1000);
1821                        printk(".");
1822
1823                /*
1824                 * Wait for USB flash devices with slow firmware.
1825                 * Yes, this sense key/ASC combination shouldn't
1826                 * occur here.  It's characteristic of these devices.
1827                 */
1828                } else if (sense_valid &&
1829                                sshdr.sense_key == UNIT_ATTENTION &&
1830                                sshdr.asc == 0x28) {
1831                        if (!spintime) {
1832                                spintime_expire = jiffies + 5 * HZ;
1833                                spintime = 1;
1834                        }
1835                        /* Wait 1 second for next try */
1836                        msleep(1000);
1837                } else {
1838                        /* we don't understand the sense code, so it's
1839                         * probably pointless to loop */
1840                        if(!spintime) {
1841                                sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1842                                sd_print_sense_hdr(sdkp, &sshdr);
1843                        }
1844                        break;
1845                }
1846                                
1847        } while (spintime && time_before_eq(jiffies, spintime_expire));
1848
1849        if (spintime) {
1850                if (scsi_status_is_good(the_result))
1851                        printk("ready\n");
1852                else
1853                        printk("not responding...\n");
1854        }
1855}
1856
1857
1858/*
1859 * Determine whether disk supports Data Integrity Field.
1860 */
1861static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1862{
1863        struct scsi_device *sdp = sdkp->device;
1864        u8 type;
1865        int ret = 0;
1866
1867        if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1868                return ret;
1869
1870        type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1871
1872        if (type > SD_DIF_TYPE3_PROTECTION)
1873                ret = -ENODEV;
1874        else if (scsi_host_dif_capable(sdp->host, type))
1875                ret = 1;
1876
1877        if (sdkp->first_scan || type != sdkp->protection_type)
1878                switch (ret) {
1879                case -ENODEV:
1880                        sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1881                                  " protection type %u. Disabling disk!\n",
1882                                  type);
1883                        break;
1884                case 1:
1885                        sd_printk(KERN_NOTICE, sdkp,
1886                                  "Enabling DIF Type %u protection\n", type);
1887                        break;
1888                case 0:
1889                        sd_printk(KERN_NOTICE, sdkp,
1890                                  "Disabling DIF Type %u protection\n", type);
1891                        break;
1892                }
1893
1894        sdkp->protection_type = type;
1895
1896        return ret;
1897}
1898
1899static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1900                        struct scsi_sense_hdr *sshdr, int sense_valid,
1901                        int the_result)
1902{
1903        sd_print_result(sdkp, the_result);
1904        if (driver_byte(the_result) & DRIVER_SENSE)
1905                sd_print_sense_hdr(sdkp, sshdr);
1906        else
1907                sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1908
1909        /*
1910         * Set dirty bit for removable devices if not ready -
1911         * sometimes drives will not report this properly.
1912         */
1913        if (sdp->removable &&
1914            sense_valid && sshdr->sense_key == NOT_READY)
1915                set_media_not_present(sdkp);
1916
1917        /*
1918         * We used to set media_present to 0 here to indicate no media
1919         * in the drive, but some drives fail read capacity even with
1920         * media present, so we can't do that.
1921         */
1922        sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1923}
1924
1925#define RC16_LEN 32
1926#if RC16_LEN > SD_BUF_SIZE
1927#error RC16_LEN must not be more than SD_BUF_SIZE
1928#endif
1929
1930#define READ_CAPACITY_RETRIES_ON_RESET  10
1931
1932static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1933                                                unsigned char *buffer)
1934{
1935        unsigned char cmd[16];
1936        struct scsi_sense_hdr sshdr;
1937        int sense_valid = 0;
1938        int the_result;
1939        int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1940        unsigned int alignment;
1941        unsigned long long lba;
1942        unsigned sector_size;
1943
1944        if (sdp->no_read_capacity_16)
1945                return -EINVAL;
1946
1947        do {
1948                memset(cmd, 0, 16);
1949                cmd[0] = SERVICE_ACTION_IN;
1950                cmd[1] = SAI_READ_CAPACITY_16;
1951                cmd[13] = RC16_LEN;
1952                memset(buffer, 0, RC16_LEN);
1953
1954                the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1955                                        buffer, RC16_LEN, &sshdr,
1956                                        SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1957
1958                if (media_not_present(sdkp, &sshdr))
1959                        return -ENODEV;
1960
1961                if (the_result) {
1962                        sense_valid = scsi_sense_valid(&sshdr);
1963                        if (sense_valid &&
1964                            sshdr.sense_key == ILLEGAL_REQUEST &&
1965                            (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1966                            sshdr.ascq == 0x00)
1967                                /* Invalid Command Operation Code or
1968                                 * Invalid Field in CDB, just retry
1969                                 * silently with RC10 */
1970                                return -EINVAL;
1971                        if (sense_valid &&
1972                            sshdr.sense_key == UNIT_ATTENTION &&
1973                            sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1974                                /* Device reset might occur several times,
1975                                 * give it one more chance */
1976                                if (--reset_retries > 0)
1977                                        continue;
1978                }
1979                retries--;
1980
1981        } while (the_result && retries);
1982
1983        if (the_result) {
1984                sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1985                read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1986                return -EINVAL;
1987        }
1988
1989        sector_size = get_unaligned_be32(&buffer[8]);
1990        lba = get_unaligned_be64(&buffer[0]);
1991
1992        if (sd_read_protection_type(sdkp, buffer) < 0) {
1993                sdkp->capacity = 0;
1994                return -ENODEV;
1995        }
1996
1997        if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1998                sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1999                        "kernel compiled with support for large block "
2000                        "devices.\n");
2001                sdkp->capacity = 0;
2002                return -EOVERFLOW;
2003        }
2004
2005        /* Logical blocks per physical block exponent */
2006        sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2007
2008        /* Lowest aligned logical block */
2009        alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2010        blk_queue_alignment_offset(sdp->request_queue, alignment);
2011        if (alignment && sdkp->first_scan)
2012                sd_printk(KERN_NOTICE, sdkp,
2013                          "physical block alignment offset: %u\n", alignment);
2014
2015        if (buffer[14] & 0x80) { /* LBPME */
2016                sdkp->lbpme = 1;
2017
2018                if (buffer[14] & 0x40) /* LBPRZ */
2019                        sdkp->lbprz = 1;
2020
2021                sd_config_discard(sdkp, SD_LBP_WS16);
2022        }
2023
2024        sdkp->capacity = lba + 1;
2025        return sector_size;
2026}
2027
2028static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2029                                                unsigned char *buffer)
2030{
2031        unsigned char cmd[16];
2032        struct scsi_sense_hdr sshdr;
2033        int sense_valid = 0;
2034        int the_result;
2035        int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2036        sector_t lba;
2037        unsigned sector_size;
2038
2039        do {
2040                cmd[0] = READ_CAPACITY;
2041                memset(&cmd[1], 0, 9);
2042                memset(buffer, 0, 8);
2043
2044                the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2045                                        buffer, 8, &sshdr,
2046                                        SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2047
2048                if (media_not_present(sdkp, &sshdr))
2049                        return -ENODEV;
2050
2051                if (the_result) {
2052                        sense_valid = scsi_sense_valid(&sshdr);
2053                        if (sense_valid &&
2054                            sshdr.sense_key == UNIT_ATTENTION &&
2055                            sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2056                                /* Device reset might occur several times,
2057                                 * give it one more chance */
2058                                if (--reset_retries > 0)
2059                                        continue;
2060                }
2061                retries--;
2062
2063        } while (the_result && retries);
2064
2065        if (the_result) {
2066                sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2067                read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2068                return -EINVAL;
2069        }
2070
2071        sector_size = get_unaligned_be32(&buffer[4]);
2072        lba = get_unaligned_be32(&buffer[0]);
2073
2074        if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2075                /* Some buggy (usb cardreader) devices return an lba of
2076                   0xffffffff when the want to report a size of 0 (with
2077                   which they really mean no media is present) */
2078                sdkp->capacity = 0;
2079                sdkp->physical_block_size = sector_size;
2080                return sector_size;
2081        }
2082
2083        if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2084                sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2085                        "kernel compiled with support for large block "
2086                        "devices.\n");
2087                sdkp->capacity = 0;
2088                return -EOVERFLOW;
2089        }
2090
2091        sdkp->capacity = lba + 1;
2092        sdkp->physical_block_size = sector_size;
2093        return sector_size;
2094}
2095
2096static int sd_try_rc16_first(struct scsi_device *sdp)
2097{
2098        if (sdp->host->max_cmd_len < 16)
2099                return 0;
2100        if (sdp->try_rc_10_first)
2101                return 0;
2102        if (sdp->scsi_level > SCSI_SPC_2)
2103                return 1;
2104        if (scsi_device_protection(sdp))
2105                return 1;
2106        return 0;
2107}
2108
2109/*
2110 * read disk capacity
2111 */
2112static void
2113sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2114{
2115        int sector_size;
2116        struct scsi_device *sdp = sdkp->device;
2117        sector_t old_capacity = sdkp->capacity;
2118
2119        if (sd_try_rc16_first(sdp)) {
2120                sector_size = read_capacity_16(sdkp, sdp, buffer);
2121                if (sector_size == -EOVERFLOW)
2122                        goto got_data;
2123                if (sector_size == -ENODEV)
2124                        return;
2125                if (sector_size < 0)
2126                        sector_size = read_capacity_10(sdkp, sdp, buffer);
2127                if (sector_size < 0)
2128                        return;
2129        } else {
2130                sector_size = read_capacity_10(sdkp, sdp, buffer);
2131                if (sector_size == -EOVERFLOW)
2132                        goto got_data;
2133                if (sector_size < 0)
2134                        return;
2135                if ((sizeof(sdkp->capacity) > 4) &&
2136                    (sdkp->capacity > 0xffffffffULL)) {
2137                        int old_sector_size = sector_size;
2138                        sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2139                                        "Trying to use READ CAPACITY(16).\n");
2140                        sector_size = read_capacity_16(sdkp, sdp, buffer);
2141                        if (sector_size < 0) {
2142                                sd_printk(KERN_NOTICE, sdkp,
2143                                        "Using 0xffffffff as device size\n");
2144                                sdkp->capacity = 1 + (sector_t) 0xffffffff;
2145                                sector_size = old_sector_size;
2146                                goto got_data;
2147                        }
2148                }
2149        }
2150
2151        /* Some devices are known to return the total number of blocks,
2152         * not the highest block number.  Some devices have versions
2153         * which do this and others which do not.  Some devices we might
2154         * suspect of doing this but we don't know for certain.
2155         *
2156         * If we know the reported capacity is wrong, decrement it.  If
2157         * we can only guess, then assume the number of blocks is even
2158         * (usually true but not always) and err on the side of lowering
2159         * the capacity.
2160         */
2161        if (sdp->fix_capacity ||
2162            (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2163                sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2164                                "from its reported value: %llu\n",
2165                                (unsigned long long) sdkp->capacity);
2166                --sdkp->capacity;
2167        }
2168
2169got_data:
2170        if (sector_size == 0) {
2171                sector_size = 512;
2172                sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2173                          "assuming 512.\n");
2174        }
2175
2176        if (sector_size != 512 &&
2177            sector_size != 1024 &&
2178            sector_size != 2048 &&
2179            sector_size != 4096 &&
2180            sector_size != 256) {
2181                sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2182                          sector_size);
2183                /*
2184                 * The user might want to re-format the drive with
2185                 * a supported sectorsize.  Once this happens, it
2186                 * would be relatively trivial to set the thing up.
2187                 * For this reason, we leave the thing in the table.
2188                 */
2189                sdkp->capacity = 0;
2190                /*
2191                 * set a bogus sector size so the normal read/write
2192                 * logic in the block layer will eventually refuse any
2193                 * request on this device without tripping over power
2194                 * of two sector size assumptions
2195                 */
2196                sector_size = 512;
2197        }
2198        blk_queue_logical_block_size(sdp->request_queue, sector_size);
2199
2200        {
2201                char cap_str_2[10], cap_str_10[10];
2202                u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2203
2204                string_get_size(sz, STRING_UNITS_2, cap_str_2,
2205                                sizeof(cap_str_2));
2206                string_get_size(sz, STRING_UNITS_10, cap_str_10,
2207                                sizeof(cap_str_10));
2208
2209                if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2210                        sd_printk(KERN_NOTICE, sdkp,
2211                                  "%llu %d-byte logical blocks: (%s/%s)\n",
2212                                  (unsigned long long)sdkp->capacity,
2213                                  sector_size, cap_str_10, cap_str_2);
2214
2215                        if (sdkp->physical_block_size != sector_size)
2216                                sd_printk(KERN_NOTICE, sdkp,
2217                                          "%u-byte physical blocks\n",
2218                                          sdkp->physical_block_size);
2219                }
2220        }
2221
2222        sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2223
2224        /* Rescale capacity to 512-byte units */
2225        if (sector_size == 4096)
2226                sdkp->capacity <<= 3;
2227        else if (sector_size == 2048)
2228                sdkp->capacity <<= 2;
2229        else if (sector_size == 1024)
2230                sdkp->capacity <<= 1;
2231        else if (sector_size == 256)
2232                sdkp->capacity >>= 1;
2233
2234        blk_queue_physical_block_size(sdp->request_queue,
2235                                      sdkp->physical_block_size);
2236        sdkp->device->sector_size = sector_size;
2237}
2238
2239/* called with buffer of length 512 */
2240static inline int
2241sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2242                 unsigned char *buffer, int len, struct scsi_mode_data *data,
2243                 struct scsi_sense_hdr *sshdr)
2244{
2245        return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2246                               SD_TIMEOUT, SD_MAX_RETRIES, data,
2247                               sshdr);
2248}
2249
2250/*
2251 * read write protect setting, if possible - called only in sd_revalidate_disk()
2252 * called with buffer of length SD_BUF_SIZE
2253 */
2254static void
2255sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2256{
2257        int res;
2258        struct scsi_device *sdp = sdkp->device;
2259        struct scsi_mode_data data;
2260        int old_wp = sdkp->write_prot;
2261
2262        set_disk_ro(sdkp->disk, 0);
2263        if (sdp->skip_ms_page_3f) {
2264                sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2265                return;
2266        }
2267
2268        if (sdp->use_192_bytes_for_3f) {
2269                res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2270        } else {
2271                /*
2272                 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2273                 * We have to start carefully: some devices hang if we ask
2274                 * for more than is available.
2275                 */
2276                res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2277
2278                /*
2279                 * Second attempt: ask for page 0 When only page 0 is
2280                 * implemented, a request for page 3F may return Sense Key
2281                 * 5: Illegal Request, Sense Code 24: Invalid field in
2282                 * CDB.
2283                 */
2284                if (!scsi_status_is_good(res))
2285                        res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2286
2287                /*
2288                 * Third attempt: ask 255 bytes, as we did earlier.
2289                 */
2290                if (!scsi_status_is_good(res))
2291                        res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2292                                               &data, NULL);
2293        }
2294
2295        if (!scsi_status_is_good(res)) {
2296                sd_printk(KERN_WARNING, sdkp,
2297                          "Test WP failed, assume Write Enabled\n");
2298        } else {
2299                sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2300                set_disk_ro(sdkp->disk, sdkp->write_prot);
2301                if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2302                        sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2303                                  sdkp->write_prot ? "on" : "off");
2304                        sd_printk(KERN_DEBUG, sdkp,
2305                                  "Mode Sense: %02x %02x %02x %02x\n",
2306                                  buffer[0], buffer[1], buffer[2], buffer[3]);
2307                }
2308        }
2309}
2310
2311/*
2312 * sd_read_cache_type - called only from sd_revalidate_disk()
2313 * called with buffer of length SD_BUF_SIZE
2314 */
2315static void
2316sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2317{
2318        int len = 0, res;
2319        struct scsi_device *sdp = sdkp->device;
2320
2321        int dbd;
2322        int modepage;
2323        int first_len;
2324        struct scsi_mode_data data;
2325        struct scsi_sense_hdr sshdr;
2326        int old_wce = sdkp->WCE;
2327        int old_rcd = sdkp->RCD;
2328        int old_dpofua = sdkp->DPOFUA;
2329
2330
2331        if (sdkp->cache_override)
2332                return;
2333
2334        first_len = 4;
2335        if (sdp->skip_ms_page_8) {
2336                if (sdp->type == TYPE_RBC)
2337                        goto defaults;
2338                else {
2339                        if (sdp->skip_ms_page_3f)
2340                                goto defaults;
2341                        modepage = 0x3F;
2342                        if (sdp->use_192_bytes_for_3f)
2343                                first_len = 192;
2344                        dbd = 0;
2345                }
2346        } else if (sdp->type == TYPE_RBC) {
2347                modepage = 6;
2348                dbd = 8;
2349        } else {
2350                modepage = 8;
2351                dbd = 0;
2352        }
2353
2354        /* cautiously ask */
2355        res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2356                        &data, &sshdr);
2357
2358        if (!scsi_status_is_good(res))
2359                goto bad_sense;
2360
2361        if (!data.header_length) {
2362                modepage = 6;
2363                first_len = 0;
2364                sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2365        }
2366
2367        /* that went OK, now ask for the proper length */
2368        len = data.length;
2369
2370        /*
2371         * We're only interested in the first three bytes, actually.
2372         * But the data cache page is defined for the first 20.
2373         */
2374        if (len < 3)
2375                goto bad_sense;
2376        else if (len > SD_BUF_SIZE) {
2377                sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2378                          "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2379                len = SD_BUF_SIZE;
2380        }
2381        if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2382                len = 192;
2383
2384        /* Get the data */
2385        if (len > first_len)
2386                res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2387                                &data, &sshdr);
2388
2389        if (scsi_status_is_good(res)) {
2390                int offset = data.header_length + data.block_descriptor_length;
2391
2392                while (offset < len) {
2393                        u8 page_code = buffer[offset] & 0x3F;
2394                        u8 spf       = buffer[offset] & 0x40;
2395
2396                        if (page_code == 8 || page_code == 6) {
2397                                /* We're interested only in the first 3 bytes.
2398                                 */
2399                                if (len - offset <= 2) {
2400                                        sd_printk(KERN_ERR, sdkp, "Incomplete "
2401                                                  "mode parameter data\n");
2402                                        goto defaults;
2403                                } else {
2404                                        modepage = page_code;
2405                                        goto Page_found;
2406                                }
2407                        } else {
2408                                /* Go to the next page */
2409                                if (spf && len - offset > 3)
2410                                        offset += 4 + (buffer[offset+2] << 8) +
2411                                                buffer[offset+3];
2412                                else if (!spf && len - offset > 1)
2413                                        offset += 2 + buffer[offset+1];
2414                                else {
2415                                        sd_printk(KERN_ERR, sdkp, "Incomplete "
2416                                                  "mode parameter data\n");
2417                                        goto defaults;
2418                                }
2419                        }
2420                }
2421
2422                if (modepage == 0x3F) {
2423                        sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2424                                  "present\n");
2425                        goto defaults;
2426                } else if ((buffer[offset] & 0x3f) != modepage) {
2427                        sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2428                        goto defaults;
2429                }
2430        Page_found:
2431                if (modepage == 8) {
2432                        sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2433                        sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2434                } else {
2435                        sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2436                        sdkp->RCD = 0;
2437                }
2438
2439                sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2440                if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2441                        sd_printk(KERN_NOTICE, sdkp,
2442                                  "Uses READ/WRITE(6), disabling FUA\n");
2443                        sdkp->DPOFUA = 0;
2444                }
2445
2446                if (sdkp->first_scan || old_wce != sdkp->WCE ||
2447                    old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2448                        sd_printk(KERN_NOTICE, sdkp,
2449                                  "Write cache: %s, read cache: %s, %s\n",
2450                                  sdkp->WCE ? "enabled" : "disabled",
2451                                  sdkp->RCD ? "disabled" : "enabled",
2452                                  sdkp->DPOFUA ? "supports DPO and FUA"
2453                                  : "doesn't support DPO or FUA");
2454
2455                return;
2456        }
2457
2458bad_sense:
2459        if (scsi_sense_valid(&sshdr) &&
2460            sshdr.sense_key == ILLEGAL_REQUEST &&
2461            sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2462                /* Invalid field in CDB */
2463                sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2464        else
2465                sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2466
2467defaults:
2468        if (sdp->wce_default_on) {
2469                sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2470                sdkp->WCE = 1;
2471        } else {
2472                sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2473                sdkp->WCE = 0;
2474        }
2475        sdkp->RCD = 0;
2476        sdkp->DPOFUA = 0;
2477}
2478
2479/*
2480 * The ATO bit indicates whether the DIF application tag is available
2481 * for use by the operating system.
2482 */
2483static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2484{
2485        int res, offset;
2486        struct scsi_device *sdp = sdkp->device;
2487        struct scsi_mode_data data;
2488        struct scsi_sense_hdr sshdr;
2489
2490        if (sdp->type != TYPE_DISK)
2491                return;
2492
2493        if (sdkp->protection_type == 0)
2494                return;
2495
2496        res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2497                              SD_MAX_RETRIES, &data, &sshdr);
2498
2499        if (!scsi_status_is_good(res) || !data.header_length ||
2500            data.length < 6) {
2501                sd_printk(KERN_WARNING, sdkp,
2502                          "getting Control mode page failed, assume no ATO\n");
2503
2504                if (scsi_sense_valid(&sshdr))
2505                        sd_print_sense_hdr(sdkp, &sshdr);
2506
2507                return;
2508        }
2509
2510        offset = data.header_length + data.block_descriptor_length;
2511
2512        if ((buffer[offset] & 0x3f) != 0x0a) {
2513                sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2514                return;
2515        }
2516
2517        if ((buffer[offset + 5] & 0x80) == 0)
2518                return;
2519
2520        sdkp->ATO = 1;
2521
2522        return;
2523}
2524
2525/**
2526 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2527 * @disk: disk to query
2528 */
2529static void sd_read_block_limits(struct scsi_disk *sdkp)
2530{
2531        unsigned int sector_sz = sdkp->device->sector_size;
2532        const int vpd_len = 64;
2533        unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2534
2535        if (!buffer ||
2536            /* Block Limits VPD */
2537            scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2538                goto out;
2539
2540        blk_queue_io_min(sdkp->disk->queue,
2541                         get_unaligned_be16(&buffer[6]) * sector_sz);
2542        blk_queue_io_opt(sdkp->disk->queue,
2543                         get_unaligned_be32(&buffer[12]) * sector_sz);
2544
2545        if (buffer[3] == 0x3c) {
2546                unsigned int lba_count, desc_count;
2547
2548                sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2549
2550                if (!sdkp->lbpme)
2551                        goto out;
2552
2553                lba_count = get_unaligned_be32(&buffer[20]);
2554                desc_count = get_unaligned_be32(&buffer[24]);
2555
2556                if (lba_count && desc_count)
2557                        sdkp->max_unmap_blocks = lba_count;
2558
2559                sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2560
2561                if (buffer[32] & 0x80)
2562                        sdkp->unmap_alignment =
2563                                get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2564
2565                if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2566
2567                        if (sdkp->max_unmap_blocks)
2568                                sd_config_discard(sdkp, SD_LBP_UNMAP);
2569                        else
2570                                sd_config_discard(sdkp, SD_LBP_WS16);
2571
2572                } else {        /* LBP VPD page tells us what to use */
2573
2574                        if (sdkp->lbpu && sdkp->max_unmap_blocks)
2575                                sd_config_discard(sdkp, SD_LBP_UNMAP);
2576                        else if (sdkp->lbpws)
2577                                sd_config_discard(sdkp, SD_LBP_WS16);
2578                        else if (sdkp->lbpws10)
2579                                sd_config_discard(sdkp, SD_LBP_WS10);
2580                        else
2581                                sd_config_discard(sdkp, SD_LBP_DISABLE);
2582                }
2583        }
2584
2585 out:
2586        kfree(buffer);
2587}
2588
2589/**
2590 * sd_read_block_characteristics - Query block dev. characteristics
2591 * @disk: disk to query
2592 */
2593static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2594{
2595        unsigned char *buffer;
2596        u16 rot;
2597        const int vpd_len = 64;
2598
2599        buffer = kmalloc(vpd_len, GFP_KERNEL);
2600
2601        if (!buffer ||
2602            /* Block Device Characteristics VPD */
2603            scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2604                goto out;
2605
2606        rot = get_unaligned_be16(&buffer[4]);
2607
2608        if (rot == 1)
2609                queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2610
2611 out:
2612        kfree(buffer);
2613}
2614
2615/**
2616 * sd_read_block_provisioning - Query provisioning VPD page
2617 * @disk: disk to query
2618 */
2619static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2620{
2621        unsigned char *buffer;
2622        const int vpd_len = 8;
2623
2624        if (sdkp->lbpme == 0)
2625                return;
2626
2627        buffer = kmalloc(vpd_len, GFP_KERNEL);
2628
2629        if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2630                goto out;
2631
2632        sdkp->lbpvpd    = 1;
2633        sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2634        sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2635        sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2636
2637 out:
2638        kfree(buffer);
2639}
2640
2641static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2642{
2643        struct scsi_device *sdev = sdkp->device;
2644
2645        if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2646                sdev->no_report_opcodes = 1;
2647
2648                /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2649                 * CODES is unsupported and the device has an ATA
2650                 * Information VPD page (SAT).
2651                 */
2652                if (!scsi_get_vpd_page(sdev, 0x89, buffer, SD_BUF_SIZE))
2653                        sdev->no_write_same = 1;
2654        }
2655
2656        if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2657                sdkp->ws16 = 1;
2658
2659        if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2660                sdkp->ws10 = 1;
2661}
2662
2663static int sd_try_extended_inquiry(struct scsi_device *sdp)
2664{
2665        /*
2666         * Although VPD inquiries can go to SCSI-2 type devices,
2667         * some USB ones crash on receiving them, and the pages
2668         * we currently ask for are for SPC-3 and beyond
2669         */
2670        if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2671                return 1;
2672        return 0;
2673}
2674
2675/**
2676 *      sd_revalidate_disk - called the first time a new disk is seen,
2677 *      performs disk spin up, read_capacity, etc.
2678 *      @disk: struct gendisk we care about
2679 **/
2680static int sd_revalidate_disk(struct gendisk *disk)
2681{
2682        struct scsi_disk *sdkp = scsi_disk(disk);
2683        struct scsi_device *sdp = sdkp->device;
2684        unsigned char *buffer;
2685        unsigned flush = 0;
2686
2687        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2688                                      "sd_revalidate_disk\n"));
2689
2690        /*
2691         * If the device is offline, don't try and read capacity or any
2692         * of the other niceties.
2693         */
2694        if (!scsi_device_online(sdp))
2695                goto out;
2696
2697        buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2698        if (!buffer) {
2699                sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2700                          "allocation failure.\n");
2701                goto out;
2702        }
2703
2704        sd_spinup_disk(sdkp);
2705
2706        /*
2707         * Without media there is no reason to ask; moreover, some devices
2708         * react badly if we do.
2709         */
2710        if (sdkp->media_present) {
2711                sd_read_capacity(sdkp, buffer);
2712
2713                if (sd_try_extended_inquiry(sdp)) {
2714                        sd_read_block_provisioning(sdkp);
2715                        sd_read_block_limits(sdkp);
2716                        sd_read_block_characteristics(sdkp);
2717                }
2718
2719                sd_read_write_protect_flag(sdkp, buffer);
2720                sd_read_cache_type(sdkp, buffer);
2721                sd_read_app_tag_own(sdkp, buffer);
2722                sd_read_write_same(sdkp, buffer);
2723        }
2724
2725        sdkp->first_scan = 0;
2726
2727        /*
2728         * We now have all cache related info, determine how we deal
2729         * with flush requests.
2730         */
2731        if (sdkp->WCE) {
2732                flush |= REQ_FLUSH;
2733                if (sdkp->DPOFUA)
2734                        flush |= REQ_FUA;
2735        }
2736
2737        blk_queue_flush(sdkp->disk->queue, flush);
2738
2739        set_capacity(disk, sdkp->capacity);
2740        sd_config_write_same(sdkp);
2741        kfree(buffer);
2742
2743 out:
2744        return 0;
2745}
2746
2747/**
2748 *      sd_unlock_native_capacity - unlock native capacity
2749 *      @disk: struct gendisk to set capacity for
2750 *
2751 *      Block layer calls this function if it detects that partitions
2752 *      on @disk reach beyond the end of the device.  If the SCSI host
2753 *      implements ->unlock_native_capacity() method, it's invoked to
2754 *      give it a chance to adjust the device capacity.
2755 *
2756 *      CONTEXT:
2757 *      Defined by block layer.  Might sleep.
2758 */
2759static void sd_unlock_native_capacity(struct gendisk *disk)
2760{
2761        struct scsi_device *sdev = scsi_disk(disk)->device;
2762
2763        if (sdev->host->hostt->unlock_native_capacity)
2764                sdev->host->hostt->unlock_native_capacity(sdev);
2765}
2766
2767/**
2768 *      sd_format_disk_name - format disk name
2769 *      @prefix: name prefix - ie. "sd" for SCSI disks
2770 *      @index: index of the disk to format name for
2771 *      @buf: output buffer
2772 *      @buflen: length of the output buffer
2773 *
2774 *      SCSI disk names starts at sda.  The 26th device is sdz and the
2775 *      27th is sdaa.  The last one for two lettered suffix is sdzz
2776 *      which is followed by sdaaa.
2777 *
2778 *      This is basically 26 base counting with one extra 'nil' entry
2779 *      at the beginning from the second digit on and can be
2780 *      determined using similar method as 26 base conversion with the
2781 *      index shifted -1 after each digit is computed.
2782 *
2783 *      CONTEXT:
2784 *      Don't care.
2785 *
2786 *      RETURNS:
2787 *      0 on success, -errno on failure.
2788 */
2789static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2790{
2791        const int base = 'z' - 'a' + 1;
2792        char *begin = buf + strlen(prefix);
2793        char *end = buf + buflen;
2794        char *p;
2795        int unit;
2796
2797        p = end - 1;
2798        *p = '\0';
2799        unit = base;
2800        do {
2801                if (p == begin)
2802                        return -EINVAL;
2803                *--p = 'a' + (index % unit);
2804                index = (index / unit) - 1;
2805        } while (index >= 0);
2806
2807        memmove(begin, p, end - p);
2808        memcpy(buf, prefix, strlen(prefix));
2809
2810        return 0;
2811}
2812
2813/*
2814 * The asynchronous part of sd_probe
2815 */
2816static void sd_probe_async(void *data, async_cookie_t cookie)
2817{
2818        struct scsi_disk *sdkp = data;
2819        struct scsi_device *sdp;
2820        struct gendisk *gd;
2821        u32 index;
2822        struct device *dev;
2823
2824        sdp = sdkp->device;
2825        gd = sdkp->disk;
2826        index = sdkp->index;
2827        dev = &sdp->sdev_gendev;
2828
2829        gd->major = sd_major((index & 0xf0) >> 4);
2830        gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2831        gd->minors = SD_MINORS;
2832
2833        gd->fops = &sd_fops;
2834        gd->private_data = &sdkp->driver;
2835        gd->queue = sdkp->device->request_queue;
2836
2837        /* defaults, until the device tells us otherwise */
2838        sdp->sector_size = 512;
2839        sdkp->capacity = 0;
2840        sdkp->media_present = 1;
2841        sdkp->write_prot = 0;
2842        sdkp->cache_override = 0;
2843        sdkp->WCE = 0;
2844        sdkp->RCD = 0;
2845        sdkp->ATO = 0;
2846        sdkp->first_scan = 1;
2847        sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2848
2849        sd_revalidate_disk(gd);
2850
2851        blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2852        blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2853
2854        gd->driverfs_dev = &sdp->sdev_gendev;
2855        gd->flags = GENHD_FL_EXT_DEVT;
2856        if (sdp->removable) {
2857                gd->flags |= GENHD_FL_REMOVABLE;
2858                gd->events |= DISK_EVENT_MEDIA_CHANGE;
2859        }
2860
2861        add_disk(gd);
2862        if (sdkp->capacity)
2863                sd_dif_config_host(sdkp);
2864
2865        sd_revalidate_disk(gd);
2866
2867        sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2868                  sdp->removable ? "removable " : "");
2869        blk_pm_runtime_init(sdp->request_queue, dev);
2870        scsi_autopm_put_device(sdp);
2871        put_device(&sdkp->dev);
2872}
2873
2874/**
2875 *      sd_probe - called during driver initialization and whenever a
2876 *      new scsi device is attached to the system. It is called once
2877 *      for each scsi device (not just disks) present.
2878 *      @dev: pointer to device object
2879 *
2880 *      Returns 0 if successful (or not interested in this scsi device 
2881 *      (e.g. scanner)); 1 when there is an error.
2882 *
2883 *      Note: this function is invoked from the scsi mid-level.
2884 *      This function sets up the mapping between a given 
2885 *      <host,channel,id,lun> (found in sdp) and new device name 
2886 *      (e.g. /dev/sda). More precisely it is the block device major 
2887 *      and minor number that is chosen here.
2888 *
2889 *      Assume sd_probe is not re-entrant (for time being)
2890 *      Also think about sd_probe() and sd_remove() running coincidentally.
2891 **/
2892static int sd_probe(struct device *dev)
2893{
2894        struct scsi_device *sdp = to_scsi_device(dev);
2895        struct scsi_disk *sdkp;
2896        struct gendisk *gd;
2897        int index;
2898        int error;
2899
2900        error = -ENODEV;
2901        if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2902                goto out;
2903
2904        SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2905                                        "sd_probe\n"));
2906
2907        error = -ENOMEM;
2908        sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2909        if (!sdkp)
2910                goto out;
2911
2912        gd = alloc_disk(SD_MINORS);
2913        if (!gd)
2914                goto out_free;
2915
2916        do {
2917                if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2918                        goto out_put;
2919
2920                spin_lock(&sd_index_lock);
2921                error = ida_get_new(&sd_index_ida, &index);
2922                spin_unlock(&sd_index_lock);
2923        } while (error == -EAGAIN);
2924
2925        if (error) {
2926                sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2927                goto out_put;
2928        }
2929
2930        error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2931        if (error) {
2932                sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2933                goto out_free_index;
2934        }
2935
2936        sdkp->device = sdp;
2937        sdkp->driver = &sd_template;
2938        sdkp->disk = gd;
2939        sdkp->index = index;
2940        atomic_set(&sdkp->openers, 0);
2941        atomic_set(&sdkp->device->ioerr_cnt, 0);
2942
2943        if (!sdp->request_queue->rq_timeout) {
2944                if (sdp->type != TYPE_MOD)
2945                        blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2946                else
2947                        blk_queue_rq_timeout(sdp->request_queue,
2948                                             SD_MOD_TIMEOUT);
2949        }
2950
2951        device_initialize(&sdkp->dev);
2952        sdkp->dev.parent = dev;
2953        sdkp->dev.class = &sd_disk_class;
2954        dev_set_name(&sdkp->dev, "%s", dev_name(dev));
2955
2956        if (device_add(&sdkp->dev))
2957                goto out_free_index;
2958
2959        get_device(dev);
2960        dev_set_drvdata(dev, sdkp);
2961
2962        get_device(&sdkp->dev); /* prevent release before async_schedule */
2963        async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
2964
2965        return 0;
2966
2967 out_free_index:
2968        spin_lock(&sd_index_lock);
2969        ida_remove(&sd_index_ida, index);
2970        spin_unlock(&sd_index_lock);
2971 out_put:
2972        put_disk(gd);
2973 out_free:
2974        kfree(sdkp);
2975 out:
2976        return error;
2977}
2978
2979/**
2980 *      sd_remove - called whenever a scsi disk (previously recognized by
2981 *      sd_probe) is detached from the system. It is called (potentially
2982 *      multiple times) during sd module unload.
2983 *      @sdp: pointer to mid level scsi device object
2984 *
2985 *      Note: this function is invoked from the scsi mid-level.
2986 *      This function potentially frees up a device name (e.g. /dev/sdc)
2987 *      that could be re-used by a subsequent sd_probe().
2988 *      This function is not called when the built-in sd driver is "exit-ed".
2989 **/
2990static int sd_remove(struct device *dev)
2991{
2992        struct scsi_disk *sdkp;
2993        dev_t devt;
2994
2995        sdkp = dev_get_drvdata(dev);
2996        devt = disk_devt(sdkp->disk);
2997        scsi_autopm_get_device(sdkp->device);
2998
2999        async_synchronize_full_domain(&scsi_sd_probe_domain);
3000        blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
3001        blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
3002        device_del(&sdkp->dev);
3003        del_gendisk(sdkp->disk);
3004        sd_shutdown(dev);
3005
3006        blk_register_region(devt, SD_MINORS, NULL,
3007                            sd_default_probe, NULL, NULL);
3008
3009        mutex_lock(&sd_ref_mutex);
3010        dev_set_drvdata(dev, NULL);
3011        put_device(&sdkp->dev);
3012        mutex_unlock(&sd_ref_mutex);
3013
3014        return 0;
3015}
3016
3017/**
3018 *      scsi_disk_release - Called to free the scsi_disk structure
3019 *      @dev: pointer to embedded class device
3020 *
3021 *      sd_ref_mutex must be held entering this routine.  Because it is
3022 *      called on last put, you should always use the scsi_disk_get()
3023 *      scsi_disk_put() helpers which manipulate the semaphore directly
3024 *      and never do a direct put_device.
3025 **/
3026static void scsi_disk_release(struct device *dev)
3027{
3028        struct scsi_disk *sdkp = to_scsi_disk(dev);
3029        struct gendisk *disk = sdkp->disk;
3030        
3031        spin_lock(&sd_index_lock);
3032        ida_remove(&sd_index_ida, sdkp->index);
3033        spin_unlock(&sd_index_lock);
3034
3035        disk->private_data = NULL;
3036        put_disk(disk);
3037        put_device(&sdkp->device->sdev_gendev);
3038
3039        kfree(sdkp);
3040}
3041
3042static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3043{
3044        unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3045        struct scsi_sense_hdr sshdr;
3046        struct scsi_device *sdp = sdkp->device;
3047        int res;
3048
3049        if (start)
3050                cmd[4] |= 1;    /* START */
3051
3052        if (sdp->start_stop_pwr_cond)
3053                cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3054
3055        if (!scsi_device_online(sdp))
3056                return -ENODEV;
3057
3058        res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3059                               SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3060        if (res) {
3061                sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3062                sd_print_result(sdkp, res);
3063                if (driver_byte(res) & DRIVER_SENSE)
3064                        sd_print_sense_hdr(sdkp, &sshdr);
3065        }
3066
3067        return res;
3068}
3069
3070/*
3071 * Send a SYNCHRONIZE CACHE instruction down to the device through
3072 * the normal SCSI command structure.  Wait for the command to
3073 * complete.
3074 */
3075static void sd_shutdown(struct device *dev)
3076{
3077        struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3078
3079        if (!sdkp)
3080                return;         /* this can happen */
3081
3082        if (pm_runtime_suspended(dev))
3083                goto exit;
3084
3085        if (sdkp->WCE) {
3086                sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3087                sd_sync_cache(sdkp);
3088        }
3089
3090        if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3091                sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3092                sd_start_stop_device(sdkp, 0);
3093        }
3094
3095exit:
3096        scsi_disk_put(sdkp);
3097}
3098
3099static int sd_suspend(struct device *dev)
3100{
3101        struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3102        int ret = 0;
3103
3104        if (!sdkp)
3105                return 0;       /* this can happen */
3106
3107        if (sdkp->WCE) {
3108                sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3109                ret = sd_sync_cache(sdkp);
3110                if (ret)
3111                        goto done;
3112        }
3113
3114        if (sdkp->device->manage_start_stop) {
3115                sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3116                ret = sd_start_stop_device(sdkp, 0);
3117        }
3118
3119done:
3120        scsi_disk_put(sdkp);
3121        return ret;
3122}
3123
3124static int sd_resume(struct device *dev)
3125{
3126        struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3127        int ret = 0;
3128
3129        if (!sdkp->device->manage_start_stop)
3130                goto done;
3131
3132        sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3133        ret = sd_start_stop_device(sdkp, 1);
3134
3135done:
3136        scsi_disk_put(sdkp);
3137        return ret;
3138}
3139
3140/**
3141 *      init_sd - entry point for this driver (both when built in or when
3142 *      a module).
3143 *
3144 *      Note: this function registers this driver with the scsi mid-level.
3145 **/
3146static int __init init_sd(void)
3147{
3148        int majors = 0, i, err;
3149
3150        SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3151
3152        for (i = 0; i < SD_MAJORS; i++) {
3153                if (register_blkdev(sd_major(i), "sd") != 0)
3154                        continue;
3155                majors++;
3156                blk_register_region(sd_major(i), SD_MINORS, NULL,
3157                                    sd_default_probe, NULL, NULL);
3158        }
3159
3160        if (!majors)
3161                return -ENODEV;
3162
3163        err = class_register(&sd_disk_class);
3164        if (err)
3165                goto err_out;
3166
3167        sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3168                                         0, 0, NULL);
3169        if (!sd_cdb_cache) {
3170                printk(KERN_ERR "sd: can't init extended cdb cache\n");
3171                goto err_out_class;
3172        }
3173
3174        sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3175        if (!sd_cdb_pool) {
3176                printk(KERN_ERR "sd: can't init extended cdb pool\n");
3177                goto err_out_cache;
3178        }
3179
3180        err = scsi_register_driver(&sd_template.gendrv);
3181        if (err)
3182                goto err_out_driver;
3183
3184        return 0;
3185
3186err_out_driver:
3187        mempool_destroy(sd_cdb_pool);
3188
3189err_out_cache:
3190        kmem_cache_destroy(sd_cdb_cache);
3191
3192err_out_class:
3193        class_unregister(&sd_disk_class);
3194err_out:
3195        for (i = 0; i < SD_MAJORS; i++)
3196                unregister_blkdev(sd_major(i), "sd");
3197        return err;
3198}
3199
3200/**
3201 *      exit_sd - exit point for this driver (when it is a module).
3202 *
3203 *      Note: this function unregisters this driver from the scsi mid-level.
3204 **/
3205static void __exit exit_sd(void)
3206{
3207        int i;
3208
3209        SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3210
3211        scsi_unregister_driver(&sd_template.gendrv);
3212        mempool_destroy(sd_cdb_pool);
3213        kmem_cache_destroy(sd_cdb_cache);
3214
3215        class_unregister(&sd_disk_class);
3216
3217        for (i = 0; i < SD_MAJORS; i++) {
3218                blk_unregister_region(sd_major(i), SD_MINORS);
3219                unregister_blkdev(sd_major(i), "sd");
3220        }
3221}
3222
3223module_init(init_sd);
3224module_exit(exit_sd);
3225
3226static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3227                               struct scsi_sense_hdr *sshdr)
3228{
3229        sd_printk(KERN_INFO, sdkp, " ");
3230        scsi_show_sense_hdr(sshdr);
3231        sd_printk(KERN_INFO, sdkp, " ");
3232        scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3233}
3234
3235static void sd_print_result(struct scsi_disk *sdkp, int result)
3236{
3237        sd_printk(KERN_INFO, sdkp, " ");
3238        scsi_show_result(result);
3239}
3240
3241
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