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