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