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