linux/drivers/scsi/sd.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *      sd.c Copyright (C) 1992 Drew Eckhardt
   4 *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   5 *
   6 *      Linux scsi disk driver
   7 *              Initial versions: Drew Eckhardt
   8 *              Subsequent revisions: Eric Youngdale
   9 *      Modification history:
  10 *       - Drew Eckhardt <drew@colorado.edu> original
  11 *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 
  12 *         outstanding request, and other enhancements.
  13 *         Support loadable low-level scsi drivers.
  14 *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 
  15 *         eight major numbers.
  16 *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
  17 *       - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 
  18 *         sd_init and cleanups.
  19 *       - Alex Davis <letmein@erols.com> Fix problem where partition info
  20 *         not being read in sd_open. Fix problem where removable media 
  21 *         could be ejected after sd_open.
  22 *       - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
  23 *       - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 
  24 *         <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 
  25 *         Support 32k/1M disks.
  26 *
  27 *      Logging policy (needs CONFIG_SCSI_LOGGING defined):
  28 *       - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  29 *       - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  30 *       - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  31 *       - entering other commands: SCSI_LOG_HLQUEUE level 3
  32 *      Note: when the logging level is set by the user, it must be greater
  33 *      than the level indicated above to trigger output.       
  34 */
  35
  36#include <linux/module.h>
  37#include <linux/fs.h>
  38#include <linux/kernel.h>
  39#include <linux/mm.h>
  40#include <linux/bio.h>
  41#include <linux/genhd.h>
  42#include <linux/hdreg.h>
  43#include <linux/errno.h>
  44#include <linux/idr.h>
  45#include <linux/interrupt.h>
  46#include <linux/init.h>
  47#include <linux/blkdev.h>
  48#include <linux/blkpg.h>
  49#include <linux/blk-pm.h>
  50#include <linux/delay.h>
  51#include <linux/mutex.h>
  52#include <linux/string_helpers.h>
  53#include <linux/async.h>
  54#include <linux/slab.h>
  55#include <linux/sed-opal.h>
  56#include <linux/pm_runtime.h>
  57#include <linux/pr.h>
  58#include <linux/t10-pi.h>
  59#include <linux/uaccess.h>
  60#include <asm/unaligned.h>
  61
  62#include <scsi/scsi.h>
  63#include <scsi/scsi_cmnd.h>
  64#include <scsi/scsi_dbg.h>
  65#include <scsi/scsi_device.h>
  66#include <scsi/scsi_driver.h>
  67#include <scsi/scsi_eh.h>
  68#include <scsi/scsi_host.h>
  69#include <scsi/scsi_ioctl.h>
  70#include <scsi/scsicam.h>
  71
  72#include "sd.h"
  73#include "scsi_priv.h"
  74#include "scsi_logging.h"
  75
  76MODULE_AUTHOR("Eric Youngdale");
  77MODULE_DESCRIPTION("SCSI disk (sd) driver");
  78MODULE_LICENSE("GPL");
  79
  80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  91MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  92MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  93MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  94MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  95MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  96MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  97MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  98MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  99MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
 100
 101#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
 102#define SD_MINORS       16
 103#else
 104#define SD_MINORS       0
 105#endif
 106
 107static void sd_config_discard(struct scsi_disk *, unsigned int);
 108static void sd_config_write_same(struct scsi_disk *);
 109static int  sd_revalidate_disk(struct gendisk *);
 110static void sd_unlock_native_capacity(struct gendisk *disk);
 111static int  sd_probe(struct device *);
 112static int  sd_remove(struct device *);
 113static void sd_shutdown(struct device *);
 114static int sd_suspend_system(struct device *);
 115static int sd_suspend_runtime(struct device *);
 116static int sd_resume(struct device *);
 117static void sd_rescan(struct device *);
 118static blk_status_t sd_init_command(struct scsi_cmnd *SCpnt);
 119static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 120static int sd_done(struct scsi_cmnd *);
 121static void sd_eh_reset(struct scsi_cmnd *);
 122static int sd_eh_action(struct scsi_cmnd *, int);
 123static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 124static void scsi_disk_release(struct device *cdev);
 125static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 126static void sd_print_result(const struct scsi_disk *, const char *, int);
 127
 128static DEFINE_IDA(sd_index_ida);
 129
 130/* This semaphore is used to mediate the 0->1 reference get in the
 131 * face of object destruction (i.e. we can't allow a get on an
 132 * object after last put) */
 133static DEFINE_MUTEX(sd_ref_mutex);
 134
 135static struct kmem_cache *sd_cdb_cache;
 136static mempool_t *sd_cdb_pool;
 137static mempool_t *sd_page_pool;
 138
 139static const char *sd_cache_types[] = {
 140        "write through", "none", "write back",
 141        "write back, no read (daft)"
 142};
 143
 144static void sd_set_flush_flag(struct scsi_disk *sdkp)
 145{
 146        bool wc = false, fua = false;
 147
 148        if (sdkp->WCE) {
 149                wc = true;
 150                if (sdkp->DPOFUA)
 151                        fua = true;
 152        }
 153
 154        blk_queue_write_cache(sdkp->disk->queue, wc, fua);
 155}
 156
 157static ssize_t
 158cache_type_store(struct device *dev, struct device_attribute *attr,
 159                 const char *buf, size_t count)
 160{
 161        int ct, rcd, wce, sp;
 162        struct scsi_disk *sdkp = to_scsi_disk(dev);
 163        struct scsi_device *sdp = sdkp->device;
 164        char buffer[64];
 165        char *buffer_data;
 166        struct scsi_mode_data data;
 167        struct scsi_sense_hdr sshdr;
 168        static const char temp[] = "temporary ";
 169        int len;
 170
 171        if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 172                /* no cache control on RBC devices; theoretically they
 173                 * can do it, but there's probably so many exceptions
 174                 * it's not worth the risk */
 175                return -EINVAL;
 176
 177        if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 178                buf += sizeof(temp) - 1;
 179                sdkp->cache_override = 1;
 180        } else {
 181                sdkp->cache_override = 0;
 182        }
 183
 184        ct = sysfs_match_string(sd_cache_types, buf);
 185        if (ct < 0)
 186                return -EINVAL;
 187
 188        rcd = ct & 0x01 ? 1 : 0;
 189        wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 190
 191        if (sdkp->cache_override) {
 192                sdkp->WCE = wce;
 193                sdkp->RCD = rcd;
 194                sd_set_flush_flag(sdkp);
 195                return count;
 196        }
 197
 198        if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 199                            SD_MAX_RETRIES, &data, NULL))
 200                return -EINVAL;
 201        len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 202                  data.block_descriptor_length);
 203        buffer_data = buffer + data.header_length +
 204                data.block_descriptor_length;
 205        buffer_data[2] &= ~0x05;
 206        buffer_data[2] |= wce << 2 | rcd;
 207        sp = buffer_data[0] & 0x80 ? 1 : 0;
 208        buffer_data[0] &= ~0x80;
 209
 210        /*
 211         * Ensure WP, DPOFUA, and RESERVED fields are cleared in
 212         * received mode parameter buffer before doing MODE SELECT.
 213         */
 214        data.device_specific = 0;
 215
 216        if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 217                             SD_MAX_RETRIES, &data, &sshdr)) {
 218                if (scsi_sense_valid(&sshdr))
 219                        sd_print_sense_hdr(sdkp, &sshdr);
 220                return -EINVAL;
 221        }
 222        revalidate_disk(sdkp->disk);
 223        return count;
 224}
 225
 226static ssize_t
 227manage_start_stop_show(struct device *dev, struct device_attribute *attr,
 228                       char *buf)
 229{
 230        struct scsi_disk *sdkp = to_scsi_disk(dev);
 231        struct scsi_device *sdp = sdkp->device;
 232
 233        return sprintf(buf, "%u\n", sdp->manage_start_stop);
 234}
 235
 236static ssize_t
 237manage_start_stop_store(struct device *dev, struct device_attribute *attr,
 238                        const char *buf, size_t count)
 239{
 240        struct scsi_disk *sdkp = to_scsi_disk(dev);
 241        struct scsi_device *sdp = sdkp->device;
 242        bool v;
 243
 244        if (!capable(CAP_SYS_ADMIN))
 245                return -EACCES;
 246
 247        if (kstrtobool(buf, &v))
 248                return -EINVAL;
 249
 250        sdp->manage_start_stop = v;
 251
 252        return count;
 253}
 254static DEVICE_ATTR_RW(manage_start_stop);
 255
 256static ssize_t
 257allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 258{
 259        struct scsi_disk *sdkp = to_scsi_disk(dev);
 260
 261        return sprintf(buf, "%u\n", sdkp->device->allow_restart);
 262}
 263
 264static ssize_t
 265allow_restart_store(struct device *dev, struct device_attribute *attr,
 266                    const char *buf, size_t count)
 267{
 268        bool v;
 269        struct scsi_disk *sdkp = to_scsi_disk(dev);
 270        struct scsi_device *sdp = sdkp->device;
 271
 272        if (!capable(CAP_SYS_ADMIN))
 273                return -EACCES;
 274
 275        if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 276                return -EINVAL;
 277
 278        if (kstrtobool(buf, &v))
 279                return -EINVAL;
 280
 281        sdp->allow_restart = v;
 282
 283        return count;
 284}
 285static DEVICE_ATTR_RW(allow_restart);
 286
 287static ssize_t
 288cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 289{
 290        struct scsi_disk *sdkp = to_scsi_disk(dev);
 291        int ct = sdkp->RCD + 2*sdkp->WCE;
 292
 293        return sprintf(buf, "%s\n", sd_cache_types[ct]);
 294}
 295static DEVICE_ATTR_RW(cache_type);
 296
 297static ssize_t
 298FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 299{
 300        struct scsi_disk *sdkp = to_scsi_disk(dev);
 301
 302        return sprintf(buf, "%u\n", sdkp->DPOFUA);
 303}
 304static DEVICE_ATTR_RO(FUA);
 305
 306static ssize_t
 307protection_type_show(struct device *dev, struct device_attribute *attr,
 308                     char *buf)
 309{
 310        struct scsi_disk *sdkp = to_scsi_disk(dev);
 311
 312        return sprintf(buf, "%u\n", sdkp->protection_type);
 313}
 314
 315static ssize_t
 316protection_type_store(struct device *dev, struct device_attribute *attr,
 317                      const char *buf, size_t count)
 318{
 319        struct scsi_disk *sdkp = to_scsi_disk(dev);
 320        unsigned int val;
 321        int err;
 322
 323        if (!capable(CAP_SYS_ADMIN))
 324                return -EACCES;
 325
 326        err = kstrtouint(buf, 10, &val);
 327
 328        if (err)
 329                return err;
 330
 331        if (val <= T10_PI_TYPE3_PROTECTION)
 332                sdkp->protection_type = val;
 333
 334        return count;
 335}
 336static DEVICE_ATTR_RW(protection_type);
 337
 338static ssize_t
 339protection_mode_show(struct device *dev, struct device_attribute *attr,
 340                     char *buf)
 341{
 342        struct scsi_disk *sdkp = to_scsi_disk(dev);
 343        struct scsi_device *sdp = sdkp->device;
 344        unsigned int dif, dix;
 345
 346        dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 347        dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 348
 349        if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
 350                dif = 0;
 351                dix = 1;
 352        }
 353
 354        if (!dif && !dix)
 355                return sprintf(buf, "none\n");
 356
 357        return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
 358}
 359static DEVICE_ATTR_RO(protection_mode);
 360
 361static ssize_t
 362app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 363{
 364        struct scsi_disk *sdkp = to_scsi_disk(dev);
 365
 366        return sprintf(buf, "%u\n", sdkp->ATO);
 367}
 368static DEVICE_ATTR_RO(app_tag_own);
 369
 370static ssize_t
 371thin_provisioning_show(struct device *dev, struct device_attribute *attr,
 372                       char *buf)
 373{
 374        struct scsi_disk *sdkp = to_scsi_disk(dev);
 375
 376        return sprintf(buf, "%u\n", sdkp->lbpme);
 377}
 378static DEVICE_ATTR_RO(thin_provisioning);
 379
 380/* sysfs_match_string() requires dense arrays */
 381static const char *lbp_mode[] = {
 382        [SD_LBP_FULL]           = "full",
 383        [SD_LBP_UNMAP]          = "unmap",
 384        [SD_LBP_WS16]           = "writesame_16",
 385        [SD_LBP_WS10]           = "writesame_10",
 386        [SD_LBP_ZERO]           = "writesame_zero",
 387        [SD_LBP_DISABLE]        = "disabled",
 388};
 389
 390static ssize_t
 391provisioning_mode_show(struct device *dev, struct device_attribute *attr,
 392                       char *buf)
 393{
 394        struct scsi_disk *sdkp = to_scsi_disk(dev);
 395
 396        return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 397}
 398
 399static ssize_t
 400provisioning_mode_store(struct device *dev, struct device_attribute *attr,
 401                        const char *buf, size_t count)
 402{
 403        struct scsi_disk *sdkp = to_scsi_disk(dev);
 404        struct scsi_device *sdp = sdkp->device;
 405        int mode;
 406
 407        if (!capable(CAP_SYS_ADMIN))
 408                return -EACCES;
 409
 410        if (sd_is_zoned(sdkp)) {
 411                sd_config_discard(sdkp, SD_LBP_DISABLE);
 412                return count;
 413        }
 414
 415        if (sdp->type != TYPE_DISK)
 416                return -EINVAL;
 417
 418        mode = sysfs_match_string(lbp_mode, buf);
 419        if (mode < 0)
 420                return -EINVAL;
 421
 422        sd_config_discard(sdkp, mode);
 423
 424        return count;
 425}
 426static DEVICE_ATTR_RW(provisioning_mode);
 427
 428/* sysfs_match_string() requires dense arrays */
 429static const char *zeroing_mode[] = {
 430        [SD_ZERO_WRITE]         = "write",
 431        [SD_ZERO_WS]            = "writesame",
 432        [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
 433        [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
 434};
 435
 436static ssize_t
 437zeroing_mode_show(struct device *dev, struct device_attribute *attr,
 438                  char *buf)
 439{
 440        struct scsi_disk *sdkp = to_scsi_disk(dev);
 441
 442        return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
 443}
 444
 445static ssize_t
 446zeroing_mode_store(struct device *dev, struct device_attribute *attr,
 447                   const char *buf, size_t count)
 448{
 449        struct scsi_disk *sdkp = to_scsi_disk(dev);
 450        int mode;
 451
 452        if (!capable(CAP_SYS_ADMIN))
 453                return -EACCES;
 454
 455        mode = sysfs_match_string(zeroing_mode, buf);
 456        if (mode < 0)
 457                return -EINVAL;
 458
 459        sdkp->zeroing_mode = mode;
 460
 461        return count;
 462}
 463static DEVICE_ATTR_RW(zeroing_mode);
 464
 465static ssize_t
 466max_medium_access_timeouts_show(struct device *dev,
 467                                struct device_attribute *attr, char *buf)
 468{
 469        struct scsi_disk *sdkp = to_scsi_disk(dev);
 470
 471        return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
 472}
 473
 474static ssize_t
 475max_medium_access_timeouts_store(struct device *dev,
 476                                 struct device_attribute *attr, const char *buf,
 477                                 size_t count)
 478{
 479        struct scsi_disk *sdkp = to_scsi_disk(dev);
 480        int err;
 481
 482        if (!capable(CAP_SYS_ADMIN))
 483                return -EACCES;
 484
 485        err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 486
 487        return err ? err : count;
 488}
 489static DEVICE_ATTR_RW(max_medium_access_timeouts);
 490
 491static ssize_t
 492max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
 493                           char *buf)
 494{
 495        struct scsi_disk *sdkp = to_scsi_disk(dev);
 496
 497        return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
 498}
 499
 500static ssize_t
 501max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
 502                            const char *buf, size_t count)
 503{
 504        struct scsi_disk *sdkp = to_scsi_disk(dev);
 505        struct scsi_device *sdp = sdkp->device;
 506        unsigned long max;
 507        int err;
 508
 509        if (!capable(CAP_SYS_ADMIN))
 510                return -EACCES;
 511
 512        if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 513                return -EINVAL;
 514
 515        err = kstrtoul(buf, 10, &max);
 516
 517        if (err)
 518                return err;
 519
 520        if (max == 0)
 521                sdp->no_write_same = 1;
 522        else if (max <= SD_MAX_WS16_BLOCKS) {
 523                sdp->no_write_same = 0;
 524                sdkp->max_ws_blocks = max;
 525        }
 526
 527        sd_config_write_same(sdkp);
 528
 529        return count;
 530}
 531static DEVICE_ATTR_RW(max_write_same_blocks);
 532
 533static struct attribute *sd_disk_attrs[] = {
 534        &dev_attr_cache_type.attr,
 535        &dev_attr_FUA.attr,
 536        &dev_attr_allow_restart.attr,
 537        &dev_attr_manage_start_stop.attr,
 538        &dev_attr_protection_type.attr,
 539        &dev_attr_protection_mode.attr,
 540        &dev_attr_app_tag_own.attr,
 541        &dev_attr_thin_provisioning.attr,
 542        &dev_attr_provisioning_mode.attr,
 543        &dev_attr_zeroing_mode.attr,
 544        &dev_attr_max_write_same_blocks.attr,
 545        &dev_attr_max_medium_access_timeouts.attr,
 546        NULL,
 547};
 548ATTRIBUTE_GROUPS(sd_disk);
 549
 550static struct class sd_disk_class = {
 551        .name           = "scsi_disk",
 552        .owner          = THIS_MODULE,
 553        .dev_release    = scsi_disk_release,
 554        .dev_groups     = sd_disk_groups,
 555};
 556
 557static const struct dev_pm_ops sd_pm_ops = {
 558        .suspend                = sd_suspend_system,
 559        .resume                 = sd_resume,
 560        .poweroff               = sd_suspend_system,
 561        .restore                = sd_resume,
 562        .runtime_suspend        = sd_suspend_runtime,
 563        .runtime_resume         = sd_resume,
 564};
 565
 566static struct scsi_driver sd_template = {
 567        .gendrv = {
 568                .name           = "sd",
 569                .owner          = THIS_MODULE,
 570                .probe          = sd_probe,
 571                .probe_type     = PROBE_PREFER_ASYNCHRONOUS,
 572                .remove         = sd_remove,
 573                .shutdown       = sd_shutdown,
 574                .pm             = &sd_pm_ops,
 575        },
 576        .rescan                 = sd_rescan,
 577        .init_command           = sd_init_command,
 578        .uninit_command         = sd_uninit_command,
 579        .done                   = sd_done,
 580        .eh_action              = sd_eh_action,
 581        .eh_reset               = sd_eh_reset,
 582};
 583
 584/*
 585 * Dummy kobj_map->probe function.
 586 * The default ->probe function will call modprobe, which is
 587 * pointless as this module is already loaded.
 588 */
 589static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
 590{
 591        return NULL;
 592}
 593
 594/*
 595 * Device no to disk mapping:
 596 * 
 597 *       major         disc2     disc  p1
 598 *   |............|.............|....|....| <- dev_t
 599 *    31        20 19          8 7  4 3  0
 600 * 
 601 * Inside a major, we have 16k disks, however mapped non-
 602 * contiguously. The first 16 disks are for major0, the next
 603 * ones with major1, ... Disk 256 is for major0 again, disk 272 
 604 * for major1, ... 
 605 * As we stay compatible with our numbering scheme, we can reuse 
 606 * the well-know SCSI majors 8, 65--71, 136--143.
 607 */
 608static int sd_major(int major_idx)
 609{
 610        switch (major_idx) {
 611        case 0:
 612                return SCSI_DISK0_MAJOR;
 613        case 1 ... 7:
 614                return SCSI_DISK1_MAJOR + major_idx - 1;
 615        case 8 ... 15:
 616                return SCSI_DISK8_MAJOR + major_idx - 8;
 617        default:
 618                BUG();
 619                return 0;       /* shut up gcc */
 620        }
 621}
 622
 623static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 624{
 625        struct scsi_disk *sdkp = NULL;
 626
 627        mutex_lock(&sd_ref_mutex);
 628
 629        if (disk->private_data) {
 630                sdkp = scsi_disk(disk);
 631                if (scsi_device_get(sdkp->device) == 0)
 632                        get_device(&sdkp->dev);
 633                else
 634                        sdkp = NULL;
 635        }
 636        mutex_unlock(&sd_ref_mutex);
 637        return sdkp;
 638}
 639
 640static void scsi_disk_put(struct scsi_disk *sdkp)
 641{
 642        struct scsi_device *sdev = sdkp->device;
 643
 644        mutex_lock(&sd_ref_mutex);
 645        put_device(&sdkp->dev);
 646        scsi_device_put(sdev);
 647        mutex_unlock(&sd_ref_mutex);
 648}
 649
 650#ifdef CONFIG_BLK_SED_OPAL
 651static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
 652                size_t len, bool send)
 653{
 654        struct scsi_device *sdev = data;
 655        u8 cdb[12] = { 0, };
 656        int ret;
 657
 658        cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
 659        cdb[1] = secp;
 660        put_unaligned_be16(spsp, &cdb[2]);
 661        put_unaligned_be32(len, &cdb[6]);
 662
 663        ret = scsi_execute_req(sdev, cdb,
 664                        send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
 665                        buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
 666        return ret <= 0 ? ret : -EIO;
 667}
 668#endif /* CONFIG_BLK_SED_OPAL */
 669
 670/*
 671 * Look up the DIX operation based on whether the command is read or
 672 * write and whether dix and dif are enabled.
 673 */
 674static unsigned int sd_prot_op(bool write, bool dix, bool dif)
 675{
 676        /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
 677        static const unsigned int ops[] = {     /* wrt dix dif */
 678                SCSI_PROT_NORMAL,               /*  0   0   0  */
 679                SCSI_PROT_READ_STRIP,           /*  0   0   1  */
 680                SCSI_PROT_READ_INSERT,          /*  0   1   0  */
 681                SCSI_PROT_READ_PASS,            /*  0   1   1  */
 682                SCSI_PROT_NORMAL,               /*  1   0   0  */
 683                SCSI_PROT_WRITE_INSERT,         /*  1   0   1  */
 684                SCSI_PROT_WRITE_STRIP,          /*  1   1   0  */
 685                SCSI_PROT_WRITE_PASS,           /*  1   1   1  */
 686        };
 687
 688        return ops[write << 2 | dix << 1 | dif];
 689}
 690
 691/*
 692 * Returns a mask of the protection flags that are valid for a given DIX
 693 * operation.
 694 */
 695static unsigned int sd_prot_flag_mask(unsigned int prot_op)
 696{
 697        static const unsigned int flag_mask[] = {
 698                [SCSI_PROT_NORMAL]              = 0,
 699
 700                [SCSI_PROT_READ_STRIP]          = SCSI_PROT_TRANSFER_PI |
 701                                                  SCSI_PROT_GUARD_CHECK |
 702                                                  SCSI_PROT_REF_CHECK |
 703                                                  SCSI_PROT_REF_INCREMENT,
 704
 705                [SCSI_PROT_READ_INSERT]         = SCSI_PROT_REF_INCREMENT |
 706                                                  SCSI_PROT_IP_CHECKSUM,
 707
 708                [SCSI_PROT_READ_PASS]           = SCSI_PROT_TRANSFER_PI |
 709                                                  SCSI_PROT_GUARD_CHECK |
 710                                                  SCSI_PROT_REF_CHECK |
 711                                                  SCSI_PROT_REF_INCREMENT |
 712                                                  SCSI_PROT_IP_CHECKSUM,
 713
 714                [SCSI_PROT_WRITE_INSERT]        = SCSI_PROT_TRANSFER_PI |
 715                                                  SCSI_PROT_REF_INCREMENT,
 716
 717                [SCSI_PROT_WRITE_STRIP]         = SCSI_PROT_GUARD_CHECK |
 718                                                  SCSI_PROT_REF_CHECK |
 719                                                  SCSI_PROT_REF_INCREMENT |
 720                                                  SCSI_PROT_IP_CHECKSUM,
 721
 722                [SCSI_PROT_WRITE_PASS]          = SCSI_PROT_TRANSFER_PI |
 723                                                  SCSI_PROT_GUARD_CHECK |
 724                                                  SCSI_PROT_REF_CHECK |
 725                                                  SCSI_PROT_REF_INCREMENT |
 726                                                  SCSI_PROT_IP_CHECKSUM,
 727        };
 728
 729        return flag_mask[prot_op];
 730}
 731
 732static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
 733                                           unsigned int dix, unsigned int dif)
 734{
 735        struct bio *bio = scmd->request->bio;
 736        unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
 737        unsigned int protect = 0;
 738
 739        if (dix) {                              /* DIX Type 0, 1, 2, 3 */
 740                if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
 741                        scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
 742
 743                if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 744                        scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
 745        }
 746
 747        if (dif != T10_PI_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
 748                scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
 749
 750                if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 751                        scmd->prot_flags |= SCSI_PROT_REF_CHECK;
 752        }
 753
 754        if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
 755                scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
 756
 757                if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
 758                        protect = 3 << 5;       /* Disable target PI checking */
 759                else
 760                        protect = 1 << 5;       /* Enable target PI checking */
 761        }
 762
 763        scsi_set_prot_op(scmd, prot_op);
 764        scsi_set_prot_type(scmd, dif);
 765        scmd->prot_flags &= sd_prot_flag_mask(prot_op);
 766
 767        return protect;
 768}
 769
 770static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 771{
 772        struct request_queue *q = sdkp->disk->queue;
 773        unsigned int logical_block_size = sdkp->device->sector_size;
 774        unsigned int max_blocks = 0;
 775
 776        q->limits.discard_alignment =
 777                sdkp->unmap_alignment * logical_block_size;
 778        q->limits.discard_granularity =
 779                max(sdkp->physical_block_size,
 780                    sdkp->unmap_granularity * logical_block_size);
 781        sdkp->provisioning_mode = mode;
 782
 783        switch (mode) {
 784
 785        case SD_LBP_FULL:
 786        case SD_LBP_DISABLE:
 787                blk_queue_max_discard_sectors(q, 0);
 788                blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
 789                return;
 790
 791        case SD_LBP_UNMAP:
 792                max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 793                                          (u32)SD_MAX_WS16_BLOCKS);
 794                break;
 795
 796        case SD_LBP_WS16:
 797                if (sdkp->device->unmap_limit_for_ws)
 798                        max_blocks = sdkp->max_unmap_blocks;
 799                else
 800                        max_blocks = sdkp->max_ws_blocks;
 801
 802                max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
 803                break;
 804
 805        case SD_LBP_WS10:
 806                if (sdkp->device->unmap_limit_for_ws)
 807                        max_blocks = sdkp->max_unmap_blocks;
 808                else
 809                        max_blocks = sdkp->max_ws_blocks;
 810
 811                max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
 812                break;
 813
 814        case SD_LBP_ZERO:
 815                max_blocks = min_not_zero(sdkp->max_ws_blocks,
 816                                          (u32)SD_MAX_WS10_BLOCKS);
 817                break;
 818        }
 819
 820        blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
 821        blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 822}
 823
 824static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
 825{
 826        struct scsi_device *sdp = cmd->device;
 827        struct request *rq = cmd->request;
 828        u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 829        u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 830        unsigned int data_len = 24;
 831        char *buf;
 832
 833        rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 834        if (!rq->special_vec.bv_page)
 835                return BLK_STS_RESOURCE;
 836        clear_highpage(rq->special_vec.bv_page);
 837        rq->special_vec.bv_offset = 0;
 838        rq->special_vec.bv_len = data_len;
 839        rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 840
 841        cmd->cmd_len = 10;
 842        cmd->cmnd[0] = UNMAP;
 843        cmd->cmnd[8] = 24;
 844
 845        buf = page_address(rq->special_vec.bv_page);
 846        put_unaligned_be16(6 + 16, &buf[0]);
 847        put_unaligned_be16(16, &buf[2]);
 848        put_unaligned_be64(lba, &buf[8]);
 849        put_unaligned_be32(nr_blocks, &buf[16]);
 850
 851        cmd->allowed = SD_MAX_RETRIES;
 852        cmd->transfersize = data_len;
 853        rq->timeout = SD_TIMEOUT;
 854
 855        return scsi_init_io(cmd);
 856}
 857
 858static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
 859                bool unmap)
 860{
 861        struct scsi_device *sdp = cmd->device;
 862        struct request *rq = cmd->request;
 863        u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 864        u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 865        u32 data_len = sdp->sector_size;
 866
 867        rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 868        if (!rq->special_vec.bv_page)
 869                return BLK_STS_RESOURCE;
 870        clear_highpage(rq->special_vec.bv_page);
 871        rq->special_vec.bv_offset = 0;
 872        rq->special_vec.bv_len = data_len;
 873        rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 874
 875        cmd->cmd_len = 16;
 876        cmd->cmnd[0] = WRITE_SAME_16;
 877        if (unmap)
 878                cmd->cmnd[1] = 0x8; /* UNMAP */
 879        put_unaligned_be64(lba, &cmd->cmnd[2]);
 880        put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
 881
 882        cmd->allowed = SD_MAX_RETRIES;
 883        cmd->transfersize = data_len;
 884        rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 885
 886        return scsi_init_io(cmd);
 887}
 888
 889static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
 890                bool unmap)
 891{
 892        struct scsi_device *sdp = cmd->device;
 893        struct request *rq = cmd->request;
 894        u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 895        u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 896        u32 data_len = sdp->sector_size;
 897
 898        rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 899        if (!rq->special_vec.bv_page)
 900                return BLK_STS_RESOURCE;
 901        clear_highpage(rq->special_vec.bv_page);
 902        rq->special_vec.bv_offset = 0;
 903        rq->special_vec.bv_len = data_len;
 904        rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 905
 906        cmd->cmd_len = 10;
 907        cmd->cmnd[0] = WRITE_SAME;
 908        if (unmap)
 909                cmd->cmnd[1] = 0x8; /* UNMAP */
 910        put_unaligned_be32(lba, &cmd->cmnd[2]);
 911        put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
 912
 913        cmd->allowed = SD_MAX_RETRIES;
 914        cmd->transfersize = data_len;
 915        rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 916
 917        return scsi_init_io(cmd);
 918}
 919
 920static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
 921{
 922        struct request *rq = cmd->request;
 923        struct scsi_device *sdp = cmd->device;
 924        struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 925        u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 926        u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 927
 928        if (!(rq->cmd_flags & REQ_NOUNMAP)) {
 929                switch (sdkp->zeroing_mode) {
 930                case SD_ZERO_WS16_UNMAP:
 931                        return sd_setup_write_same16_cmnd(cmd, true);
 932                case SD_ZERO_WS10_UNMAP:
 933                        return sd_setup_write_same10_cmnd(cmd, true);
 934                }
 935        }
 936
 937        if (sdp->no_write_same)
 938                return BLK_STS_TARGET;
 939
 940        if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff)
 941                return sd_setup_write_same16_cmnd(cmd, false);
 942
 943        return sd_setup_write_same10_cmnd(cmd, false);
 944}
 945
 946static void sd_config_write_same(struct scsi_disk *sdkp)
 947{
 948        struct request_queue *q = sdkp->disk->queue;
 949        unsigned int logical_block_size = sdkp->device->sector_size;
 950
 951        if (sdkp->device->no_write_same) {
 952                sdkp->max_ws_blocks = 0;
 953                goto out;
 954        }
 955
 956        /* Some devices can not handle block counts above 0xffff despite
 957         * supporting WRITE SAME(16). Consequently we default to 64k
 958         * blocks per I/O unless the device explicitly advertises a
 959         * bigger limit.
 960         */
 961        if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 962                sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 963                                                   (u32)SD_MAX_WS16_BLOCKS);
 964        else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 965                sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 966                                                   (u32)SD_MAX_WS10_BLOCKS);
 967        else {
 968                sdkp->device->no_write_same = 1;
 969                sdkp->max_ws_blocks = 0;
 970        }
 971
 972        if (sdkp->lbprz && sdkp->lbpws)
 973                sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
 974        else if (sdkp->lbprz && sdkp->lbpws10)
 975                sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
 976        else if (sdkp->max_ws_blocks)
 977                sdkp->zeroing_mode = SD_ZERO_WS;
 978        else
 979                sdkp->zeroing_mode = SD_ZERO_WRITE;
 980
 981        if (sdkp->max_ws_blocks &&
 982            sdkp->physical_block_size > logical_block_size) {
 983                /*
 984                 * Reporting a maximum number of blocks that is not aligned
 985                 * on the device physical size would cause a large write same
 986                 * request to be split into physically unaligned chunks by
 987                 * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same()
 988                 * even if the caller of these functions took care to align the
 989                 * large request. So make sure the maximum reported is aligned
 990                 * to the device physical block size. This is only an optional
 991                 * optimization for regular disks, but this is mandatory to
 992                 * avoid failure of large write same requests directed at
 993                 * sequential write required zones of host-managed ZBC disks.
 994                 */
 995                sdkp->max_ws_blocks =
 996                        round_down(sdkp->max_ws_blocks,
 997                                   bytes_to_logical(sdkp->device,
 998                                                    sdkp->physical_block_size));
 999        }
1000
1001out:
1002        blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
1003                                         (logical_block_size >> 9));
1004        blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
1005                                         (logical_block_size >> 9));
1006}
1007
1008/**
1009 * sd_setup_write_same_cmnd - write the same data to multiple blocks
1010 * @cmd: command to prepare
1011 *
1012 * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
1013 * the preference indicated by the target device.
1014 **/
1015static blk_status_t sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
1016{
1017        struct request *rq = cmd->request;
1018        struct scsi_device *sdp = cmd->device;
1019        struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
1020        struct bio *bio = rq->bio;
1021        u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1022        u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1023        blk_status_t ret;
1024
1025        if (sdkp->device->no_write_same)
1026                return BLK_STS_TARGET;
1027
1028        BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
1029
1030        rq->timeout = SD_WRITE_SAME_TIMEOUT;
1031
1032        if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff) {
1033                cmd->cmd_len = 16;
1034                cmd->cmnd[0] = WRITE_SAME_16;
1035                put_unaligned_be64(lba, &cmd->cmnd[2]);
1036                put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1037        } else {
1038                cmd->cmd_len = 10;
1039                cmd->cmnd[0] = WRITE_SAME;
1040                put_unaligned_be32(lba, &cmd->cmnd[2]);
1041                put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1042        }
1043
1044        cmd->transfersize = sdp->sector_size;
1045        cmd->allowed = SD_MAX_RETRIES;
1046
1047        /*
1048         * For WRITE SAME the data transferred via the DATA OUT buffer is
1049         * different from the amount of data actually written to the target.
1050         *
1051         * We set up __data_len to the amount of data transferred via the
1052         * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
1053         * to transfer a single sector of data first, but then reset it to
1054         * the amount of data to be written right after so that the I/O path
1055         * knows how much to actually write.
1056         */
1057        rq->__data_len = sdp->sector_size;
1058        ret = scsi_init_io(cmd);
1059        rq->__data_len = blk_rq_bytes(rq);
1060
1061        return ret;
1062}
1063
1064static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
1065{
1066        struct request *rq = cmd->request;
1067
1068        /* flush requests don't perform I/O, zero the S/G table */
1069        memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1070
1071        cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1072        cmd->cmd_len = 10;
1073        cmd->transfersize = 0;
1074        cmd->allowed = SD_MAX_RETRIES;
1075
1076        rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1077        return BLK_STS_OK;
1078}
1079
1080static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
1081                                       sector_t lba, unsigned int nr_blocks,
1082                                       unsigned char flags)
1083{
1084        cmd->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1085        if (unlikely(cmd->cmnd == NULL))
1086                return BLK_STS_RESOURCE;
1087
1088        cmd->cmd_len = SD_EXT_CDB_SIZE;
1089        memset(cmd->cmnd, 0, cmd->cmd_len);
1090
1091        cmd->cmnd[0]  = VARIABLE_LENGTH_CMD;
1092        cmd->cmnd[7]  = 0x18; /* Additional CDB len */
1093        cmd->cmnd[9]  = write ? WRITE_32 : READ_32;
1094        cmd->cmnd[10] = flags;
1095        put_unaligned_be64(lba, &cmd->cmnd[12]);
1096        put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */
1097        put_unaligned_be32(nr_blocks, &cmd->cmnd[28]);
1098
1099        return BLK_STS_OK;
1100}
1101
1102static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
1103                                       sector_t lba, unsigned int nr_blocks,
1104                                       unsigned char flags)
1105{
1106        cmd->cmd_len  = 16;
1107        cmd->cmnd[0]  = write ? WRITE_16 : READ_16;
1108        cmd->cmnd[1]  = flags;
1109        cmd->cmnd[14] = 0;
1110        cmd->cmnd[15] = 0;
1111        put_unaligned_be64(lba, &cmd->cmnd[2]);
1112        put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1113
1114        return BLK_STS_OK;
1115}
1116
1117static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
1118                                       sector_t lba, unsigned int nr_blocks,
1119                                       unsigned char flags)
1120{
1121        cmd->cmd_len = 10;
1122        cmd->cmnd[0] = write ? WRITE_10 : READ_10;
1123        cmd->cmnd[1] = flags;
1124        cmd->cmnd[6] = 0;
1125        cmd->cmnd[9] = 0;
1126        put_unaligned_be32(lba, &cmd->cmnd[2]);
1127        put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1128
1129        return BLK_STS_OK;
1130}
1131
1132static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
1133                                      sector_t lba, unsigned int nr_blocks,
1134                                      unsigned char flags)
1135{
1136        /* Avoid that 0 blocks gets translated into 256 blocks. */
1137        if (WARN_ON_ONCE(nr_blocks == 0))
1138                return BLK_STS_IOERR;
1139
1140        if (unlikely(flags & 0x8)) {
1141                /*
1142                 * This happens only if this drive failed 10byte rw
1143                 * command with ILLEGAL_REQUEST during operation and
1144                 * thus turned off use_10_for_rw.
1145                 */
1146                scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
1147                return BLK_STS_IOERR;
1148        }
1149
1150        cmd->cmd_len = 6;
1151        cmd->cmnd[0] = write ? WRITE_6 : READ_6;
1152        cmd->cmnd[1] = (lba >> 16) & 0x1f;
1153        cmd->cmnd[2] = (lba >> 8) & 0xff;
1154        cmd->cmnd[3] = lba & 0xff;
1155        cmd->cmnd[4] = nr_blocks;
1156        cmd->cmnd[5] = 0;
1157
1158        return BLK_STS_OK;
1159}
1160
1161static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
1162{
1163        struct request *rq = cmd->request;
1164        struct scsi_device *sdp = cmd->device;
1165        struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
1166        sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1167        sector_t threshold;
1168        unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1169        unsigned int mask = logical_to_sectors(sdp, 1) - 1;
1170        bool write = rq_data_dir(rq) == WRITE;
1171        unsigned char protect, fua;
1172        blk_status_t ret;
1173        unsigned int dif;
1174        bool dix;
1175
1176        ret = scsi_init_io(cmd);
1177        if (ret != BLK_STS_OK)
1178                return ret;
1179
1180        if (!scsi_device_online(sdp) || sdp->changed) {
1181                scmd_printk(KERN_ERR, cmd, "device offline or changed\n");
1182                return BLK_STS_IOERR;
1183        }
1184
1185        if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->rq_disk)) {
1186                scmd_printk(KERN_ERR, cmd, "access beyond end of device\n");
1187                return BLK_STS_IOERR;
1188        }
1189
1190        if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) {
1191                scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n");
1192                return BLK_STS_IOERR;
1193        }
1194
1195        /*
1196         * Some SD card readers can't handle accesses which touch the
1197         * last one or two logical blocks. Split accesses as needed.
1198         */
1199        threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS;
1200
1201        if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) {
1202                if (lba < threshold) {
1203                        /* Access up to the threshold but not beyond */
1204                        nr_blocks = threshold - lba;
1205                } else {
1206                        /* Access only a single logical block */
1207                        nr_blocks = 1;
1208                }
1209        }
1210
1211        fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
1212        dix = scsi_prot_sg_count(cmd);
1213        dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type);
1214
1215        if (dif || dix)
1216                protect = sd_setup_protect_cmnd(cmd, dix, dif);
1217        else
1218                protect = 0;
1219
1220        if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1221                ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
1222                                         protect | fua);
1223        } else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
1224                ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
1225                                         protect | fua);
1226        } else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
1227                   sdp->use_10_for_rw || protect) {
1228                ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
1229                                         protect | fua);
1230        } else {
1231                ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
1232                                        protect | fua);
1233        }
1234
1235        if (unlikely(ret != BLK_STS_OK))
1236                return ret;
1237
1238        /*
1239         * We shouldn't disconnect in the middle of a sector, so with a dumb
1240         * host adapter, it's safe to assume that we can at least transfer
1241         * this many bytes between each connect / disconnect.
1242         */
1243        cmd->transfersize = sdp->sector_size;
1244        cmd->underflow = nr_blocks << 9;
1245        cmd->allowed = SD_MAX_RETRIES;
1246        cmd->sdb.length = nr_blocks * sdp->sector_size;
1247
1248        SCSI_LOG_HLQUEUE(1,
1249                         scmd_printk(KERN_INFO, cmd,
1250                                     "%s: block=%llu, count=%d\n", __func__,
1251                                     (unsigned long long)blk_rq_pos(rq),
1252                                     blk_rq_sectors(rq)));
1253        SCSI_LOG_HLQUEUE(2,
1254                         scmd_printk(KERN_INFO, cmd,
1255                                     "%s %d/%u 512 byte blocks.\n",
1256                                     write ? "writing" : "reading", nr_blocks,
1257                                     blk_rq_sectors(rq)));
1258
1259        /*
1260         * This indicates that the command is ready from our end to be
1261         * queued.
1262         */
1263        return BLK_STS_OK;
1264}
1265
1266static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
1267{
1268        struct request *rq = cmd->request;
1269
1270        switch (req_op(rq)) {
1271        case REQ_OP_DISCARD:
1272                switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1273                case SD_LBP_UNMAP:
1274                        return sd_setup_unmap_cmnd(cmd);
1275                case SD_LBP_WS16:
1276                        return sd_setup_write_same16_cmnd(cmd, true);
1277                case SD_LBP_WS10:
1278                        return sd_setup_write_same10_cmnd(cmd, true);
1279                case SD_LBP_ZERO:
1280                        return sd_setup_write_same10_cmnd(cmd, false);
1281                default:
1282                        return BLK_STS_TARGET;
1283                }
1284        case REQ_OP_WRITE_ZEROES:
1285                return sd_setup_write_zeroes_cmnd(cmd);
1286        case REQ_OP_WRITE_SAME:
1287                return sd_setup_write_same_cmnd(cmd);
1288        case REQ_OP_FLUSH:
1289                return sd_setup_flush_cmnd(cmd);
1290        case REQ_OP_READ:
1291        case REQ_OP_WRITE:
1292                return sd_setup_read_write_cmnd(cmd);
1293        case REQ_OP_ZONE_RESET:
1294                return sd_zbc_setup_reset_cmnd(cmd, false);
1295        case REQ_OP_ZONE_RESET_ALL:
1296                return sd_zbc_setup_reset_cmnd(cmd, true);
1297        default:
1298                WARN_ON_ONCE(1);
1299                return BLK_STS_NOTSUPP;
1300        }
1301}
1302
1303static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1304{
1305        struct request *rq = SCpnt->request;
1306        u8 *cmnd;
1307
1308        if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1309                mempool_free(rq->special_vec.bv_page, sd_page_pool);
1310
1311        if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1312                cmnd = SCpnt->cmnd;
1313                SCpnt->cmnd = NULL;
1314                SCpnt->cmd_len = 0;
1315                mempool_free(cmnd, sd_cdb_pool);
1316        }
1317}
1318
1319/**
1320 *      sd_open - open a scsi disk device
1321 *      @bdev: Block device of the scsi disk to open
1322 *      @mode: FMODE_* mask
1323 *
1324 *      Returns 0 if successful. Returns a negated errno value in case 
1325 *      of error.
1326 *
1327 *      Note: This can be called from a user context (e.g. fsck(1) )
1328 *      or from within the kernel (e.g. as a result of a mount(1) ).
1329 *      In the latter case @inode and @filp carry an abridged amount
1330 *      of information as noted above.
1331 *
1332 *      Locking: called with bdev->bd_mutex held.
1333 **/
1334static int sd_open(struct block_device *bdev, fmode_t mode)
1335{
1336        struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1337        struct scsi_device *sdev;
1338        int retval;
1339
1340        if (!sdkp)
1341                return -ENXIO;
1342
1343        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1344
1345        sdev = sdkp->device;
1346
1347        /*
1348         * If the device is in error recovery, wait until it is done.
1349         * If the device is offline, then disallow any access to it.
1350         */
1351        retval = -ENXIO;
1352        if (!scsi_block_when_processing_errors(sdev))
1353                goto error_out;
1354
1355        if (sdev->removable || sdkp->write_prot)
1356                check_disk_change(bdev);
1357
1358        /*
1359         * If the drive is empty, just let the open fail.
1360         */
1361        retval = -ENOMEDIUM;
1362        if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1363                goto error_out;
1364
1365        /*
1366         * If the device has the write protect tab set, have the open fail
1367         * if the user expects to be able to write to the thing.
1368         */
1369        retval = -EROFS;
1370        if (sdkp->write_prot && (mode & FMODE_WRITE))
1371                goto error_out;
1372
1373        /*
1374         * It is possible that the disk changing stuff resulted in
1375         * the device being taken offline.  If this is the case,
1376         * report this to the user, and don't pretend that the
1377         * open actually succeeded.
1378         */
1379        retval = -ENXIO;
1380        if (!scsi_device_online(sdev))
1381                goto error_out;
1382
1383        if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1384                if (scsi_block_when_processing_errors(sdev))
1385                        scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1386        }
1387
1388        return 0;
1389
1390error_out:
1391        scsi_disk_put(sdkp);
1392        return retval;  
1393}
1394
1395/**
1396 *      sd_release - invoked when the (last) close(2) is called on this
1397 *      scsi disk.
1398 *      @disk: disk to release
1399 *      @mode: FMODE_* mask
1400 *
1401 *      Returns 0. 
1402 *
1403 *      Note: may block (uninterruptible) if error recovery is underway
1404 *      on this disk.
1405 *
1406 *      Locking: called with bdev->bd_mutex held.
1407 **/
1408static void sd_release(struct gendisk *disk, fmode_t mode)
1409{
1410        struct scsi_disk *sdkp = scsi_disk(disk);
1411        struct scsi_device *sdev = sdkp->device;
1412
1413        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1414
1415        if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1416                if (scsi_block_when_processing_errors(sdev))
1417                        scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1418        }
1419
1420        scsi_disk_put(sdkp);
1421}
1422
1423static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1424{
1425        struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1426        struct scsi_device *sdp = sdkp->device;
1427        struct Scsi_Host *host = sdp->host;
1428        sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1429        int diskinfo[4];
1430
1431        /* default to most commonly used values */
1432        diskinfo[0] = 0x40;     /* 1 << 6 */
1433        diskinfo[1] = 0x20;     /* 1 << 5 */
1434        diskinfo[2] = capacity >> 11;
1435
1436        /* override with calculated, extended default, or driver values */
1437        if (host->hostt->bios_param)
1438                host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1439        else
1440                scsicam_bios_param(bdev, capacity, diskinfo);
1441
1442        geo->heads = diskinfo[0];
1443        geo->sectors = diskinfo[1];
1444        geo->cylinders = diskinfo[2];
1445        return 0;
1446}
1447
1448/**
1449 *      sd_ioctl - process an ioctl
1450 *      @bdev: target block device
1451 *      @mode: FMODE_* mask
1452 *      @cmd: ioctl command number
1453 *      @arg: this is third argument given to ioctl(2) system call.
1454 *      Often contains a pointer.
1455 *
1456 *      Returns 0 if successful (some ioctls return positive numbers on
1457 *      success as well). Returns a negated errno value in case of error.
1458 *
1459 *      Note: most ioctls are forward onto the block subsystem or further
1460 *      down in the scsi subsystem.
1461 **/
1462static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1463                    unsigned int cmd, unsigned long arg)
1464{
1465        struct gendisk *disk = bdev->bd_disk;
1466        struct scsi_disk *sdkp = scsi_disk(disk);
1467        struct scsi_device *sdp = sdkp->device;
1468        void __user *p = (void __user *)arg;
1469        int error;
1470    
1471        SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1472                                    "cmd=0x%x\n", disk->disk_name, cmd));
1473
1474        error = scsi_verify_blk_ioctl(bdev, cmd);
1475        if (error < 0)
1476                return error;
1477
1478        /*
1479         * If we are in the middle of error recovery, don't let anyone
1480         * else try and use this device.  Also, if error recovery fails, it
1481         * may try and take the device offline, in which case all further
1482         * access to the device is prohibited.
1483         */
1484        error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1485                        (mode & FMODE_NDELAY) != 0);
1486        if (error)
1487                goto out;
1488
1489        if (is_sed_ioctl(cmd))
1490                return sed_ioctl(sdkp->opal_dev, cmd, p);
1491
1492        /*
1493         * Send SCSI addressing ioctls directly to mid level, send other
1494         * ioctls to block level and then onto mid level if they can't be
1495         * resolved.
1496         */
1497        switch (cmd) {
1498                case SCSI_IOCTL_GET_IDLUN:
1499                case SCSI_IOCTL_GET_BUS_NUMBER:
1500                        error = scsi_ioctl(sdp, cmd, p);
1501                        break;
1502                default:
1503                        error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1504                        if (error != -ENOTTY)
1505                                break;
1506                        error = scsi_ioctl(sdp, cmd, p);
1507                        break;
1508        }
1509out:
1510        return error;
1511}
1512
1513static void set_media_not_present(struct scsi_disk *sdkp)
1514{
1515        if (sdkp->media_present)
1516                sdkp->device->changed = 1;
1517
1518        if (sdkp->device->removable) {
1519                sdkp->media_present = 0;
1520                sdkp->capacity = 0;
1521        }
1522}
1523
1524static int media_not_present(struct scsi_disk *sdkp,
1525                             struct scsi_sense_hdr *sshdr)
1526{
1527        if (!scsi_sense_valid(sshdr))
1528                return 0;
1529
1530        /* not invoked for commands that could return deferred errors */
1531        switch (sshdr->sense_key) {
1532        case UNIT_ATTENTION:
1533        case NOT_READY:
1534                /* medium not present */
1535                if (sshdr->asc == 0x3A) {
1536                        set_media_not_present(sdkp);
1537                        return 1;
1538                }
1539        }
1540        return 0;
1541}
1542
1543/**
1544 *      sd_check_events - check media events
1545 *      @disk: kernel device descriptor
1546 *      @clearing: disk events currently being cleared
1547 *
1548 *      Returns mask of DISK_EVENT_*.
1549 *
1550 *      Note: this function is invoked from the block subsystem.
1551 **/
1552static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1553{
1554        struct scsi_disk *sdkp = scsi_disk_get(disk);
1555        struct scsi_device *sdp;
1556        int retval;
1557
1558        if (!sdkp)
1559                return 0;
1560
1561        sdp = sdkp->device;
1562        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1563
1564        /*
1565         * If the device is offline, don't send any commands - just pretend as
1566         * if the command failed.  If the device ever comes back online, we
1567         * can deal with it then.  It is only because of unrecoverable errors
1568         * that we would ever take a device offline in the first place.
1569         */
1570        if (!scsi_device_online(sdp)) {
1571                set_media_not_present(sdkp);
1572                goto out;
1573        }
1574
1575        /*
1576         * Using TEST_UNIT_READY enables differentiation between drive with
1577         * no cartridge loaded - NOT READY, drive with changed cartridge -
1578         * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1579         *
1580         * Drives that auto spin down. eg iomega jaz 1G, will be started
1581         * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1582         * sd_revalidate() is called.
1583         */
1584        if (scsi_block_when_processing_errors(sdp)) {
1585                struct scsi_sense_hdr sshdr = { 0, };
1586
1587                retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1588                                              &sshdr);
1589
1590                /* failed to execute TUR, assume media not present */
1591                if (host_byte(retval)) {
1592                        set_media_not_present(sdkp);
1593                        goto out;
1594                }
1595
1596                if (media_not_present(sdkp, &sshdr))
1597                        goto out;
1598        }
1599
1600        /*
1601         * For removable scsi disk we have to recognise the presence
1602         * of a disk in the drive.
1603         */
1604        if (!sdkp->media_present)
1605                sdp->changed = 1;
1606        sdkp->media_present = 1;
1607out:
1608        /*
1609         * sdp->changed is set under the following conditions:
1610         *
1611         *      Medium present state has changed in either direction.
1612         *      Device has indicated UNIT_ATTENTION.
1613         */
1614        retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1615        sdp->changed = 0;
1616        scsi_disk_put(sdkp);
1617        return retval;
1618}
1619
1620static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1621{
1622        int retries, res;
1623        struct scsi_device *sdp = sdkp->device;
1624        const int timeout = sdp->request_queue->rq_timeout
1625                * SD_FLUSH_TIMEOUT_MULTIPLIER;
1626        struct scsi_sense_hdr my_sshdr;
1627
1628        if (!scsi_device_online(sdp))
1629                return -ENODEV;
1630
1631        /* caller might not be interested in sense, but we need it */
1632        if (!sshdr)
1633                sshdr = &my_sshdr;
1634
1635        for (retries = 3; retries > 0; --retries) {
1636                unsigned char cmd[10] = { 0 };
1637
1638                cmd[0] = SYNCHRONIZE_CACHE;
1639                /*
1640                 * Leave the rest of the command zero to indicate
1641                 * flush everything.
1642                 */
1643                res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1644                                timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1645                if (res == 0)
1646                        break;
1647        }
1648
1649        if (res) {
1650                sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1651
1652                if (driver_byte(res) == DRIVER_SENSE)
1653                        sd_print_sense_hdr(sdkp, sshdr);
1654
1655                /* we need to evaluate the error return  */
1656                if (scsi_sense_valid(sshdr) &&
1657                        (sshdr->asc == 0x3a ||  /* medium not present */
1658                         sshdr->asc == 0x20 ||  /* invalid command */
1659                         (sshdr->asc == 0x74 && sshdr->ascq == 0x71)))  /* drive is password locked */
1660                                /* this is no error here */
1661                                return 0;
1662
1663                switch (host_byte(res)) {
1664                /* ignore errors due to racing a disconnection */
1665                case DID_BAD_TARGET:
1666                case DID_NO_CONNECT:
1667                        return 0;
1668                /* signal the upper layer it might try again */
1669                case DID_BUS_BUSY:
1670                case DID_IMM_RETRY:
1671                case DID_REQUEUE:
1672                case DID_SOFT_ERROR:
1673                        return -EBUSY;
1674                default:
1675                        return -EIO;
1676                }
1677        }
1678        return 0;
1679}
1680
1681static void sd_rescan(struct device *dev)
1682{
1683        struct scsi_disk *sdkp = dev_get_drvdata(dev);
1684
1685        revalidate_disk(sdkp->disk);
1686}
1687
1688
1689#ifdef CONFIG_COMPAT
1690/* 
1691 * This gets directly called from VFS. When the ioctl 
1692 * is not recognized we go back to the other translation paths. 
1693 */
1694static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1695                           unsigned int cmd, unsigned long arg)
1696{
1697        struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1698        int error;
1699
1700        error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1701                        (mode & FMODE_NDELAY) != 0);
1702        if (error)
1703                return error;
1704               
1705        /* 
1706         * Let the static ioctl translation table take care of it.
1707         */
1708        if (!sdev->host->hostt->compat_ioctl)
1709                return -ENOIOCTLCMD; 
1710        return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1711}
1712#endif
1713
1714static char sd_pr_type(enum pr_type type)
1715{
1716        switch (type) {
1717        case PR_WRITE_EXCLUSIVE:
1718                return 0x01;
1719        case PR_EXCLUSIVE_ACCESS:
1720                return 0x03;
1721        case PR_WRITE_EXCLUSIVE_REG_ONLY:
1722                return 0x05;
1723        case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1724                return 0x06;
1725        case PR_WRITE_EXCLUSIVE_ALL_REGS:
1726                return 0x07;
1727        case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1728                return 0x08;
1729        default:
1730                return 0;
1731        }
1732};
1733
1734static int sd_pr_command(struct block_device *bdev, u8 sa,
1735                u64 key, u64 sa_key, u8 type, u8 flags)
1736{
1737        struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1738        struct scsi_sense_hdr sshdr;
1739        int result;
1740        u8 cmd[16] = { 0, };
1741        u8 data[24] = { 0, };
1742
1743        cmd[0] = PERSISTENT_RESERVE_OUT;
1744        cmd[1] = sa;
1745        cmd[2] = type;
1746        put_unaligned_be32(sizeof(data), &cmd[5]);
1747
1748        put_unaligned_be64(key, &data[0]);
1749        put_unaligned_be64(sa_key, &data[8]);
1750        data[20] = flags;
1751
1752        result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1753                        &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1754
1755        if (driver_byte(result) == DRIVER_SENSE &&
1756            scsi_sense_valid(&sshdr)) {
1757                sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1758                scsi_print_sense_hdr(sdev, NULL, &sshdr);
1759        }
1760
1761        return result;
1762}
1763
1764static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1765                u32 flags)
1766{
1767        if (flags & ~PR_FL_IGNORE_KEY)
1768                return -EOPNOTSUPP;
1769        return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1770                        old_key, new_key, 0,
1771                        (1 << 0) /* APTPL */);
1772}
1773
1774static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1775                u32 flags)
1776{
1777        if (flags)
1778                return -EOPNOTSUPP;
1779        return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1780}
1781
1782static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1783{
1784        return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1785}
1786
1787static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1788                enum pr_type type, bool abort)
1789{
1790        return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1791                             sd_pr_type(type), 0);
1792}
1793
1794static int sd_pr_clear(struct block_device *bdev, u64 key)
1795{
1796        return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1797}
1798
1799static const struct pr_ops sd_pr_ops = {
1800        .pr_register    = sd_pr_register,
1801        .pr_reserve     = sd_pr_reserve,
1802        .pr_release     = sd_pr_release,
1803        .pr_preempt     = sd_pr_preempt,
1804        .pr_clear       = sd_pr_clear,
1805};
1806
1807static const struct block_device_operations sd_fops = {
1808        .owner                  = THIS_MODULE,
1809        .open                   = sd_open,
1810        .release                = sd_release,
1811        .ioctl                  = sd_ioctl,
1812        .getgeo                 = sd_getgeo,
1813#ifdef CONFIG_COMPAT
1814        .compat_ioctl           = sd_compat_ioctl,
1815#endif
1816        .check_events           = sd_check_events,
1817        .revalidate_disk        = sd_revalidate_disk,
1818        .unlock_native_capacity = sd_unlock_native_capacity,
1819        .report_zones           = sd_zbc_report_zones,
1820        .pr_ops                 = &sd_pr_ops,
1821};
1822
1823/**
1824 *      sd_eh_reset - reset error handling callback
1825 *      @scmd:          sd-issued command that has failed
1826 *
1827 *      This function is called by the SCSI midlayer before starting
1828 *      SCSI EH. When counting medium access failures we have to be
1829 *      careful to register it only only once per device and SCSI EH run;
1830 *      there might be several timed out commands which will cause the
1831 *      'max_medium_access_timeouts' counter to trigger after the first
1832 *      SCSI EH run already and set the device to offline.
1833 *      So this function resets the internal counter before starting SCSI EH.
1834 **/
1835static void sd_eh_reset(struct scsi_cmnd *scmd)
1836{
1837        struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1838
1839        /* New SCSI EH run, reset gate variable */
1840        sdkp->ignore_medium_access_errors = false;
1841}
1842
1843/**
1844 *      sd_eh_action - error handling callback
1845 *      @scmd:          sd-issued command that has failed
1846 *      @eh_disp:       The recovery disposition suggested by the midlayer
1847 *
1848 *      This function is called by the SCSI midlayer upon completion of an
1849 *      error test command (currently TEST UNIT READY). The result of sending
1850 *      the eh command is passed in eh_disp.  We're looking for devices that
1851 *      fail medium access commands but are OK with non access commands like
1852 *      test unit ready (so wrongly see the device as having a successful
1853 *      recovery)
1854 **/
1855static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1856{
1857        struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1858        struct scsi_device *sdev = scmd->device;
1859
1860        if (!scsi_device_online(sdev) ||
1861            !scsi_medium_access_command(scmd) ||
1862            host_byte(scmd->result) != DID_TIME_OUT ||
1863            eh_disp != SUCCESS)
1864                return eh_disp;
1865
1866        /*
1867         * The device has timed out executing a medium access command.
1868         * However, the TEST UNIT READY command sent during error
1869         * handling completed successfully. Either the device is in the
1870         * process of recovering or has it suffered an internal failure
1871         * that prevents access to the storage medium.
1872         */
1873        if (!sdkp->ignore_medium_access_errors) {
1874                sdkp->medium_access_timed_out++;
1875                sdkp->ignore_medium_access_errors = true;
1876        }
1877
1878        /*
1879         * If the device keeps failing read/write commands but TEST UNIT
1880         * READY always completes successfully we assume that medium
1881         * access is no longer possible and take the device offline.
1882         */
1883        if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1884                scmd_printk(KERN_ERR, scmd,
1885                            "Medium access timeout failure. Offlining disk!\n");
1886                mutex_lock(&sdev->state_mutex);
1887                scsi_device_set_state(sdev, SDEV_OFFLINE);
1888                mutex_unlock(&sdev->state_mutex);
1889
1890                return SUCCESS;
1891        }
1892
1893        return eh_disp;
1894}
1895
1896static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1897{
1898        struct request *req = scmd->request;
1899        struct scsi_device *sdev = scmd->device;
1900        unsigned int transferred, good_bytes;
1901        u64 start_lba, end_lba, bad_lba;
1902
1903        /*
1904         * Some commands have a payload smaller than the device logical
1905         * block size (e.g. INQUIRY on a 4K disk).
1906         */
1907        if (scsi_bufflen(scmd) <= sdev->sector_size)
1908                return 0;
1909
1910        /* Check if we have a 'bad_lba' information */
1911        if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1912                                     SCSI_SENSE_BUFFERSIZE,
1913                                     &bad_lba))
1914                return 0;
1915
1916        /*
1917         * If the bad lba was reported incorrectly, we have no idea where
1918         * the error is.
1919         */
1920        start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1921        end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1922        if (bad_lba < start_lba || bad_lba >= end_lba)
1923                return 0;
1924
1925        /*
1926         * resid is optional but mostly filled in.  When it's unused,
1927         * its value is zero, so we assume the whole buffer transferred
1928         */
1929        transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1930
1931        /* This computation should always be done in terms of the
1932         * resolution of the device's medium.
1933         */
1934        good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1935
1936        return min(good_bytes, transferred);
1937}
1938
1939/**
1940 *      sd_done - bottom half handler: called when the lower level
1941 *      driver has completed (successfully or otherwise) a scsi command.
1942 *      @SCpnt: mid-level's per command structure.
1943 *
1944 *      Note: potentially run from within an ISR. Must not block.
1945 **/
1946static int sd_done(struct scsi_cmnd *SCpnt)
1947{
1948        int result = SCpnt->result;
1949        unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1950        unsigned int sector_size = SCpnt->device->sector_size;
1951        unsigned int resid;
1952        struct scsi_sense_hdr sshdr;
1953        struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1954        struct request *req = SCpnt->request;
1955        int sense_valid = 0;
1956        int sense_deferred = 0;
1957
1958        switch (req_op(req)) {
1959        case REQ_OP_DISCARD:
1960        case REQ_OP_WRITE_ZEROES:
1961        case REQ_OP_WRITE_SAME:
1962        case REQ_OP_ZONE_RESET:
1963        case REQ_OP_ZONE_RESET_ALL:
1964                if (!result) {
1965                        good_bytes = blk_rq_bytes(req);
1966                        scsi_set_resid(SCpnt, 0);
1967                } else {
1968                        good_bytes = 0;
1969                        scsi_set_resid(SCpnt, blk_rq_bytes(req));
1970                }
1971                break;
1972        default:
1973                /*
1974                 * In case of bogus fw or device, we could end up having
1975                 * an unaligned partial completion. Check this here and force
1976                 * alignment.
1977                 */
1978                resid = scsi_get_resid(SCpnt);
1979                if (resid & (sector_size - 1)) {
1980                        sd_printk(KERN_INFO, sdkp,
1981                                "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1982                                resid, sector_size);
1983                        scsi_print_command(SCpnt);
1984                        resid = min(scsi_bufflen(SCpnt),
1985                                    round_up(resid, sector_size));
1986                        scsi_set_resid(SCpnt, resid);
1987                }
1988        }
1989
1990        if (result) {
1991                sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1992                if (sense_valid)
1993                        sense_deferred = scsi_sense_is_deferred(&sshdr);
1994        }
1995        sdkp->medium_access_timed_out = 0;
1996
1997        if (driver_byte(result) != DRIVER_SENSE &&
1998            (!sense_valid || sense_deferred))
1999                goto out;
2000
2001        switch (sshdr.sense_key) {
2002        case HARDWARE_ERROR:
2003        case MEDIUM_ERROR:
2004                good_bytes = sd_completed_bytes(SCpnt);
2005                break;
2006        case RECOVERED_ERROR:
2007                good_bytes = scsi_bufflen(SCpnt);
2008                break;
2009        case NO_SENSE:
2010                /* This indicates a false check condition, so ignore it.  An
2011                 * unknown amount of data was transferred so treat it as an
2012                 * error.
2013                 */
2014                SCpnt->result = 0;
2015                memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2016                break;
2017        case ABORTED_COMMAND:
2018                if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
2019                        good_bytes = sd_completed_bytes(SCpnt);
2020                break;
2021        case ILLEGAL_REQUEST:
2022                switch (sshdr.asc) {
2023                case 0x10:      /* DIX: Host detected corruption */
2024                        good_bytes = sd_completed_bytes(SCpnt);
2025                        break;
2026                case 0x20:      /* INVALID COMMAND OPCODE */
2027                case 0x24:      /* INVALID FIELD IN CDB */
2028                        switch (SCpnt->cmnd[0]) {
2029                        case UNMAP:
2030                                sd_config_discard(sdkp, SD_LBP_DISABLE);
2031                                break;
2032                        case WRITE_SAME_16:
2033                        case WRITE_SAME:
2034                                if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2035                                        sd_config_discard(sdkp, SD_LBP_DISABLE);
2036                                } else {
2037                                        sdkp->device->no_write_same = 1;
2038                                        sd_config_write_same(sdkp);
2039                                        req->rq_flags |= RQF_QUIET;
2040                                }
2041                                break;
2042                        }
2043                }
2044                break;
2045        default:
2046                break;
2047        }
2048
2049 out:
2050        if (sd_is_zoned(sdkp))
2051                sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2052
2053        SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2054                                           "sd_done: completed %d of %d bytes\n",
2055                                           good_bytes, scsi_bufflen(SCpnt)));
2056
2057        return good_bytes;
2058}
2059
2060/*
2061 * spinup disk - called only in sd_revalidate_disk()
2062 */
2063static void
2064sd_spinup_disk(struct scsi_disk *sdkp)
2065{
2066        unsigned char cmd[10];
2067        unsigned long spintime_expire = 0;
2068        int retries, spintime;
2069        unsigned int the_result;
2070        struct scsi_sense_hdr sshdr;
2071        int sense_valid = 0;
2072
2073        spintime = 0;
2074
2075        /* Spin up drives, as required.  Only do this at boot time */
2076        /* Spinup needs to be done for module loads too. */
2077        do {
2078                retries = 0;
2079
2080                do {
2081                        cmd[0] = TEST_UNIT_READY;
2082                        memset((void *) &cmd[1], 0, 9);
2083
2084                        the_result = scsi_execute_req(sdkp->device, cmd,
2085                                                      DMA_NONE, NULL, 0,
2086                                                      &sshdr, SD_TIMEOUT,
2087                                                      SD_MAX_RETRIES, NULL);
2088
2089                        /*
2090                         * If the drive has indicated to us that it
2091                         * doesn't have any media in it, don't bother
2092                         * with any more polling.
2093                         */
2094                        if (media_not_present(sdkp, &sshdr))
2095                                return;
2096
2097                        if (the_result)
2098                                sense_valid = scsi_sense_valid(&sshdr);
2099                        retries++;
2100                } while (retries < 3 && 
2101                         (!scsi_status_is_good(the_result) ||
2102                          ((driver_byte(the_result) == DRIVER_SENSE) &&
2103                          sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2104
2105                if (driver_byte(the_result) != DRIVER_SENSE) {
2106                        /* no sense, TUR either succeeded or failed
2107                         * with a status error */
2108                        if(!spintime && !scsi_status_is_good(the_result)) {
2109                                sd_print_result(sdkp, "Test Unit Ready failed",
2110                                                the_result);
2111                        }
2112                        break;
2113                }
2114
2115                /*
2116                 * The device does not want the automatic start to be issued.
2117                 */
2118                if (sdkp->device->no_start_on_add)
2119                        break;
2120
2121                if (sense_valid && sshdr.sense_key == NOT_READY) {
2122                        if (sshdr.asc == 4 && sshdr.ascq == 3)
2123                                break;  /* manual intervention required */
2124                        if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2125                                break;  /* standby */
2126                        if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2127                                break;  /* unavailable */
2128                        if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2129                                break;  /* sanitize in progress */
2130                        /*
2131                         * Issue command to spin up drive when not ready
2132                         */
2133                        if (!spintime) {
2134                                sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2135                                cmd[0] = START_STOP;
2136                                cmd[1] = 1;     /* Return immediately */
2137                                memset((void *) &cmd[2], 0, 8);
2138                                cmd[4] = 1;     /* Start spin cycle */
2139                                if (sdkp->device->start_stop_pwr_cond)
2140                                        cmd[4] |= 1 << 4;
2141                                scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2142                                                 NULL, 0, &sshdr,
2143                                                 SD_TIMEOUT, SD_MAX_RETRIES,
2144                                                 NULL);
2145                                spintime_expire = jiffies + 100 * HZ;
2146                                spintime = 1;
2147                        }
2148                        /* Wait 1 second for next try */
2149                        msleep(1000);
2150                        printk(KERN_CONT ".");
2151
2152                /*
2153                 * Wait for USB flash devices with slow firmware.
2154                 * Yes, this sense key/ASC combination shouldn't
2155                 * occur here.  It's characteristic of these devices.
2156                 */
2157                } else if (sense_valid &&
2158                                sshdr.sense_key == UNIT_ATTENTION &&
2159                                sshdr.asc == 0x28) {
2160                        if (!spintime) {
2161                                spintime_expire = jiffies + 5 * HZ;
2162                                spintime = 1;
2163                        }
2164                        /* Wait 1 second for next try */
2165                        msleep(1000);
2166                } else {
2167                        /* we don't understand the sense code, so it's
2168                         * probably pointless to loop */
2169                        if(!spintime) {
2170                                sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2171                                sd_print_sense_hdr(sdkp, &sshdr);
2172                        }
2173                        break;
2174                }
2175                                
2176        } while (spintime && time_before_eq(jiffies, spintime_expire));
2177
2178        if (spintime) {
2179                if (scsi_status_is_good(the_result))
2180                        printk(KERN_CONT "ready\n");
2181                else
2182                        printk(KERN_CONT "not responding...\n");
2183        }
2184}
2185
2186/*
2187 * Determine whether disk supports Data Integrity Field.
2188 */
2189static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2190{
2191        struct scsi_device *sdp = sdkp->device;
2192        u8 type;
2193        int ret = 0;
2194
2195        if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2196                return ret;
2197
2198        type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2199
2200        if (type > T10_PI_TYPE3_PROTECTION)
2201                ret = -ENODEV;
2202        else if (scsi_host_dif_capable(sdp->host, type))
2203                ret = 1;
2204
2205        if (sdkp->first_scan || type != sdkp->protection_type)
2206                switch (ret) {
2207                case -ENODEV:
2208                        sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2209                                  " protection type %u. Disabling disk!\n",
2210                                  type);
2211                        break;
2212                case 1:
2213                        sd_printk(KERN_NOTICE, sdkp,
2214                                  "Enabling DIF Type %u protection\n", type);
2215                        break;
2216                case 0:
2217                        sd_printk(KERN_NOTICE, sdkp,
2218                                  "Disabling DIF Type %u protection\n", type);
2219                        break;
2220                }
2221
2222        sdkp->protection_type = type;
2223
2224        return ret;
2225}
2226
2227static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2228                        struct scsi_sense_hdr *sshdr, int sense_valid,
2229                        int the_result)
2230{
2231        if (driver_byte(the_result) == DRIVER_SENSE)
2232                sd_print_sense_hdr(sdkp, sshdr);
2233        else
2234                sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2235
2236        /*
2237         * Set dirty bit for removable devices if not ready -
2238         * sometimes drives will not report this properly.
2239         */
2240        if (sdp->removable &&
2241            sense_valid && sshdr->sense_key == NOT_READY)
2242                set_media_not_present(sdkp);
2243
2244        /*
2245         * We used to set media_present to 0 here to indicate no media
2246         * in the drive, but some drives fail read capacity even with
2247         * media present, so we can't do that.
2248         */
2249        sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2250}
2251
2252#define RC16_LEN 32
2253#if RC16_LEN > SD_BUF_SIZE
2254#error RC16_LEN must not be more than SD_BUF_SIZE
2255#endif
2256
2257#define READ_CAPACITY_RETRIES_ON_RESET  10
2258
2259static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2260                                                unsigned char *buffer)
2261{
2262        unsigned char cmd[16];
2263        struct scsi_sense_hdr sshdr;
2264        int sense_valid = 0;
2265        int the_result;
2266        int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2267        unsigned int alignment;
2268        unsigned long long lba;
2269        unsigned sector_size;
2270
2271        if (sdp->no_read_capacity_16)
2272                return -EINVAL;
2273
2274        do {
2275                memset(cmd, 0, 16);
2276                cmd[0] = SERVICE_ACTION_IN_16;
2277                cmd[1] = SAI_READ_CAPACITY_16;
2278                cmd[13] = RC16_LEN;
2279                memset(buffer, 0, RC16_LEN);
2280
2281                the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2282                                        buffer, RC16_LEN, &sshdr,
2283                                        SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2284
2285                if (media_not_present(sdkp, &sshdr))
2286                        return -ENODEV;
2287
2288                if (the_result) {
2289                        sense_valid = scsi_sense_valid(&sshdr);
2290                        if (sense_valid &&
2291                            sshdr.sense_key == ILLEGAL_REQUEST &&
2292                            (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2293                            sshdr.ascq == 0x00)
2294                                /* Invalid Command Operation Code or
2295                                 * Invalid Field in CDB, just retry
2296                                 * silently with RC10 */
2297                                return -EINVAL;
2298                        if (sense_valid &&
2299                            sshdr.sense_key == UNIT_ATTENTION &&
2300                            sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2301                                /* Device reset might occur several times,
2302                                 * give it one more chance */
2303                                if (--reset_retries > 0)
2304                                        continue;
2305                }
2306                retries--;
2307
2308        } while (the_result && retries);
2309
2310        if (the_result) {
2311                sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2312                read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2313                return -EINVAL;
2314        }
2315
2316        sector_size = get_unaligned_be32(&buffer[8]);
2317        lba = get_unaligned_be64(&buffer[0]);
2318
2319        if (sd_read_protection_type(sdkp, buffer) < 0) {
2320                sdkp->capacity = 0;
2321                return -ENODEV;
2322        }
2323
2324        /* Logical blocks per physical block exponent */
2325        sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2326
2327        /* RC basis */
2328        sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2329
2330        /* Lowest aligned logical block */
2331        alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2332        blk_queue_alignment_offset(sdp->request_queue, alignment);
2333        if (alignment && sdkp->first_scan)
2334                sd_printk(KERN_NOTICE, sdkp,
2335                          "physical block alignment offset: %u\n", alignment);
2336
2337        if (buffer[14] & 0x80) { /* LBPME */
2338                sdkp->lbpme = 1;
2339
2340                if (buffer[14] & 0x40) /* LBPRZ */
2341                        sdkp->lbprz = 1;
2342
2343                sd_config_discard(sdkp, SD_LBP_WS16);
2344        }
2345
2346        sdkp->capacity = lba + 1;
2347        return sector_size;
2348}
2349
2350static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2351                                                unsigned char *buffer)
2352{
2353        unsigned char cmd[16];
2354        struct scsi_sense_hdr sshdr;
2355        int sense_valid = 0;
2356        int the_result;
2357        int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2358        sector_t lba;
2359        unsigned sector_size;
2360
2361        do {
2362                cmd[0] = READ_CAPACITY;
2363                memset(&cmd[1], 0, 9);
2364                memset(buffer, 0, 8);
2365
2366                the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2367                                        buffer, 8, &sshdr,
2368                                        SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2369
2370                if (media_not_present(sdkp, &sshdr))
2371                        return -ENODEV;
2372
2373                if (the_result) {
2374                        sense_valid = scsi_sense_valid(&sshdr);
2375                        if (sense_valid &&
2376                            sshdr.sense_key == UNIT_ATTENTION &&
2377                            sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2378                                /* Device reset might occur several times,
2379                                 * give it one more chance */
2380                                if (--reset_retries > 0)
2381                                        continue;
2382                }
2383                retries--;
2384
2385        } while (the_result && retries);
2386
2387        if (the_result) {
2388                sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2389                read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2390                return -EINVAL;
2391        }
2392
2393        sector_size = get_unaligned_be32(&buffer[4]);
2394        lba = get_unaligned_be32(&buffer[0]);
2395
2396        if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2397                /* Some buggy (usb cardreader) devices return an lba of
2398                   0xffffffff when the want to report a size of 0 (with
2399                   which they really mean no media is present) */
2400                sdkp->capacity = 0;
2401                sdkp->physical_block_size = sector_size;
2402                return sector_size;
2403        }
2404
2405        sdkp->capacity = lba + 1;
2406        sdkp->physical_block_size = sector_size;
2407        return sector_size;
2408}
2409
2410static int sd_try_rc16_first(struct scsi_device *sdp)
2411{
2412        if (sdp->host->max_cmd_len < 16)
2413                return 0;
2414        if (sdp->try_rc_10_first)
2415                return 0;
2416        if (sdp->scsi_level > SCSI_SPC_2)
2417                return 1;
2418        if (scsi_device_protection(sdp))
2419                return 1;
2420        return 0;
2421}
2422
2423/*
2424 * read disk capacity
2425 */
2426static void
2427sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2428{
2429        int sector_size;
2430        struct scsi_device *sdp = sdkp->device;
2431
2432        if (sd_try_rc16_first(sdp)) {
2433                sector_size = read_capacity_16(sdkp, sdp, buffer);
2434                if (sector_size == -EOVERFLOW)
2435                        goto got_data;
2436                if (sector_size == -ENODEV)
2437                        return;
2438                if (sector_size < 0)
2439                        sector_size = read_capacity_10(sdkp, sdp, buffer);
2440                if (sector_size < 0)
2441                        return;
2442        } else {
2443                sector_size = read_capacity_10(sdkp, sdp, buffer);
2444                if (sector_size == -EOVERFLOW)
2445                        goto got_data;
2446                if (sector_size < 0)
2447                        return;
2448                if ((sizeof(sdkp->capacity) > 4) &&
2449                    (sdkp->capacity > 0xffffffffULL)) {
2450                        int old_sector_size = sector_size;
2451                        sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2452                                        "Trying to use READ CAPACITY(16).\n");
2453                        sector_size = read_capacity_16(sdkp, sdp, buffer);
2454                        if (sector_size < 0) {
2455                                sd_printk(KERN_NOTICE, sdkp,
2456                                        "Using 0xffffffff as device size\n");
2457                                sdkp->capacity = 1 + (sector_t) 0xffffffff;
2458                                sector_size = old_sector_size;
2459                                goto got_data;
2460                        }
2461                        /* Remember that READ CAPACITY(16) succeeded */
2462                        sdp->try_rc_10_first = 0;
2463                }
2464        }
2465
2466        /* Some devices are known to return the total number of blocks,
2467         * not the highest block number.  Some devices have versions
2468         * which do this and others which do not.  Some devices we might
2469         * suspect of doing this but we don't know for certain.
2470         *
2471         * If we know the reported capacity is wrong, decrement it.  If
2472         * we can only guess, then assume the number of blocks is even
2473         * (usually true but not always) and err on the side of lowering
2474         * the capacity.
2475         */
2476        if (sdp->fix_capacity ||
2477            (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2478                sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2479                                "from its reported value: %llu\n",
2480                                (unsigned long long) sdkp->capacity);
2481                --sdkp->capacity;
2482        }
2483
2484got_data:
2485        if (sector_size == 0) {
2486                sector_size = 512;
2487                sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2488                          "assuming 512.\n");
2489        }
2490
2491        if (sector_size != 512 &&
2492            sector_size != 1024 &&
2493            sector_size != 2048 &&
2494            sector_size != 4096) {
2495                sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2496                          sector_size);
2497                /*
2498                 * The user might want to re-format the drive with
2499                 * a supported sectorsize.  Once this happens, it
2500                 * would be relatively trivial to set the thing up.
2501                 * For this reason, we leave the thing in the table.
2502                 */
2503                sdkp->capacity = 0;
2504                /*
2505                 * set a bogus sector size so the normal read/write
2506                 * logic in the block layer will eventually refuse any
2507                 * request on this device without tripping over power
2508                 * of two sector size assumptions
2509                 */
2510                sector_size = 512;
2511        }
2512        blk_queue_logical_block_size(sdp->request_queue, sector_size);
2513        blk_queue_physical_block_size(sdp->request_queue,
2514                                      sdkp->physical_block_size);
2515        sdkp->device->sector_size = sector_size;
2516
2517        if (sdkp->capacity > 0xffffffff)
2518                sdp->use_16_for_rw = 1;
2519
2520}
2521
2522/*
2523 * Print disk capacity
2524 */
2525static void
2526sd_print_capacity(struct scsi_disk *sdkp,
2527                  sector_t old_capacity)
2528{
2529        int sector_size = sdkp->device->sector_size;
2530        char cap_str_2[10], cap_str_10[10];
2531
2532        if (!sdkp->first_scan && old_capacity == sdkp->capacity)
2533                return;
2534
2535        string_get_size(sdkp->capacity, sector_size,
2536                        STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2537        string_get_size(sdkp->capacity, sector_size,
2538                        STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
2539
2540        sd_printk(KERN_NOTICE, sdkp,
2541                  "%llu %d-byte logical blocks: (%s/%s)\n",
2542                  (unsigned long long)sdkp->capacity,
2543                  sector_size, cap_str_10, cap_str_2);
2544
2545        if (sdkp->physical_block_size != sector_size)
2546                sd_printk(KERN_NOTICE, sdkp,
2547                          "%u-byte physical blocks\n",
2548                          sdkp->physical_block_size);
2549
2550        sd_zbc_print_zones(sdkp);
2551}
2552
2553/* called with buffer of length 512 */
2554static inline int
2555sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2556                 unsigned char *buffer, int len, struct scsi_mode_data *data,
2557                 struct scsi_sense_hdr *sshdr)
2558{
2559        return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2560                               SD_TIMEOUT, SD_MAX_RETRIES, data,
2561                               sshdr);
2562}
2563
2564/*
2565 * read write protect setting, if possible - called only in sd_revalidate_disk()
2566 * called with buffer of length SD_BUF_SIZE
2567 */
2568static void
2569sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2570{
2571        int res;
2572        struct scsi_device *sdp = sdkp->device;
2573        struct scsi_mode_data data;
2574        int old_wp = sdkp->write_prot;
2575
2576        set_disk_ro(sdkp->disk, 0);
2577        if (sdp->skip_ms_page_3f) {
2578                sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2579                return;
2580        }
2581
2582        if (sdp->use_192_bytes_for_3f) {
2583                res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2584        } else {
2585                /*
2586                 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2587                 * We have to start carefully: some devices hang if we ask
2588                 * for more than is available.
2589                 */
2590                res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2591
2592                /*
2593                 * Second attempt: ask for page 0 When only page 0 is
2594                 * implemented, a request for page 3F may return Sense Key
2595                 * 5: Illegal Request, Sense Code 24: Invalid field in
2596                 * CDB.
2597                 */
2598                if (!scsi_status_is_good(res))
2599                        res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2600
2601                /*
2602                 * Third attempt: ask 255 bytes, as we did earlier.
2603                 */
2604                if (!scsi_status_is_good(res))
2605                        res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2606                                               &data, NULL);
2607        }
2608
2609        if (!scsi_status_is_good(res)) {
2610                sd_first_printk(KERN_WARNING, sdkp,
2611                          "Test WP failed, assume Write Enabled\n");
2612        } else {
2613                sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2614                set_disk_ro(sdkp->disk, sdkp->write_prot);
2615                if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2616                        sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2617                                  sdkp->write_prot ? "on" : "off");
2618                        sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2619                }
2620        }
2621}
2622
2623/*
2624 * sd_read_cache_type - called only from sd_revalidate_disk()
2625 * called with buffer of length SD_BUF_SIZE
2626 */
2627static void
2628sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2629{
2630        int len = 0, res;
2631        struct scsi_device *sdp = sdkp->device;
2632
2633        int dbd;
2634        int modepage;
2635        int first_len;
2636        struct scsi_mode_data data;
2637        struct scsi_sense_hdr sshdr;
2638        int old_wce = sdkp->WCE;
2639        int old_rcd = sdkp->RCD;
2640        int old_dpofua = sdkp->DPOFUA;
2641
2642
2643        if (sdkp->cache_override)
2644                return;
2645
2646        first_len = 4;
2647        if (sdp->skip_ms_page_8) {
2648                if (sdp->type == TYPE_RBC)
2649                        goto defaults;
2650                else {
2651                        if (sdp->skip_ms_page_3f)
2652                                goto defaults;
2653                        modepage = 0x3F;
2654                        if (sdp->use_192_bytes_for_3f)
2655                                first_len = 192;
2656                        dbd = 0;
2657                }
2658        } else if (sdp->type == TYPE_RBC) {
2659                modepage = 6;
2660                dbd = 8;
2661        } else {
2662                modepage = 8;
2663                dbd = 0;
2664        }
2665
2666        /* cautiously ask */
2667        res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2668                        &data, &sshdr);
2669
2670        if (!scsi_status_is_good(res))
2671                goto bad_sense;
2672
2673        if (!data.header_length) {
2674                modepage = 6;
2675                first_len = 0;
2676                sd_first_printk(KERN_ERR, sdkp,
2677                                "Missing header in MODE_SENSE response\n");
2678        }
2679
2680        /* that went OK, now ask for the proper length */
2681        len = data.length;
2682
2683        /*
2684         * We're only interested in the first three bytes, actually.
2685         * But the data cache page is defined for the first 20.
2686         */
2687        if (len < 3)
2688                goto bad_sense;
2689        else if (len > SD_BUF_SIZE) {
2690                sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2691                          "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2692                len = SD_BUF_SIZE;
2693        }
2694        if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2695                len = 192;
2696
2697        /* Get the data */
2698        if (len > first_len)
2699                res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2700                                &data, &sshdr);
2701
2702        if (scsi_status_is_good(res)) {
2703                int offset = data.header_length + data.block_descriptor_length;
2704
2705                while (offset < len) {
2706                        u8 page_code = buffer[offset] & 0x3F;
2707                        u8 spf       = buffer[offset] & 0x40;
2708
2709                        if (page_code == 8 || page_code == 6) {
2710                                /* We're interested only in the first 3 bytes.
2711                                 */
2712                                if (len - offset <= 2) {
2713                                        sd_first_printk(KERN_ERR, sdkp,
2714                                                "Incomplete mode parameter "
2715                                                        "data\n");
2716                                        goto defaults;
2717                                } else {
2718                                        modepage = page_code;
2719                                        goto Page_found;
2720                                }
2721                        } else {
2722                                /* Go to the next page */
2723                                if (spf && len - offset > 3)
2724                                        offset += 4 + (buffer[offset+2] << 8) +
2725                                                buffer[offset+3];
2726                                else if (!spf && len - offset > 1)
2727                                        offset += 2 + buffer[offset+1];
2728                                else {
2729                                        sd_first_printk(KERN_ERR, sdkp,
2730                                                        "Incomplete mode "
2731                                                        "parameter data\n");
2732                                        goto defaults;
2733                                }
2734                        }
2735                }
2736
2737                sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2738                goto defaults;
2739
2740        Page_found:
2741                if (modepage == 8) {
2742                        sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2743                        sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2744                } else {
2745                        sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2746                        sdkp->RCD = 0;
2747                }
2748
2749                sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2750                if (sdp->broken_fua) {
2751                        sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2752                        sdkp->DPOFUA = 0;
2753                } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2754                           !sdkp->device->use_16_for_rw) {
2755                        sd_first_printk(KERN_NOTICE, sdkp,
2756                                  "Uses READ/WRITE(6), disabling FUA\n");
2757                        sdkp->DPOFUA = 0;
2758                }
2759
2760                /* No cache flush allowed for write protected devices */
2761                if (sdkp->WCE && sdkp->write_prot)
2762                        sdkp->WCE = 0;
2763
2764                if (sdkp->first_scan || old_wce != sdkp->WCE ||
2765                    old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2766                        sd_printk(KERN_NOTICE, sdkp,
2767                                  "Write cache: %s, read cache: %s, %s\n",
2768                                  sdkp->WCE ? "enabled" : "disabled",
2769                                  sdkp->RCD ? "disabled" : "enabled",
2770                                  sdkp->DPOFUA ? "supports DPO and FUA"
2771                                  : "doesn't support DPO or FUA");
2772
2773                return;
2774        }
2775
2776bad_sense:
2777        if (scsi_sense_valid(&sshdr) &&
2778            sshdr.sense_key == ILLEGAL_REQUEST &&
2779            sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2780                /* Invalid field in CDB */
2781                sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2782        else
2783                sd_first_printk(KERN_ERR, sdkp,
2784                                "Asking for cache data failed\n");
2785
2786defaults:
2787        if (sdp->wce_default_on) {
2788                sd_first_printk(KERN_NOTICE, sdkp,
2789                                "Assuming drive cache: write back\n");
2790                sdkp->WCE = 1;
2791        } else {
2792                sd_first_printk(KERN_ERR, sdkp,
2793                                "Assuming drive cache: write through\n");
2794                sdkp->WCE = 0;
2795        }
2796        sdkp->RCD = 0;
2797        sdkp->DPOFUA = 0;
2798}
2799
2800/*
2801 * The ATO bit indicates whether the DIF application tag is available
2802 * for use by the operating system.
2803 */
2804static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2805{
2806        int res, offset;
2807        struct scsi_device *sdp = sdkp->device;
2808        struct scsi_mode_data data;
2809        struct scsi_sense_hdr sshdr;
2810
2811        if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2812                return;
2813
2814        if (sdkp->protection_type == 0)
2815                return;
2816
2817        res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2818                              SD_MAX_RETRIES, &data, &sshdr);
2819
2820        if (!scsi_status_is_good(res) || !data.header_length ||
2821            data.length < 6) {
2822                sd_first_printk(KERN_WARNING, sdkp,
2823                          "getting Control mode page failed, assume no ATO\n");
2824
2825                if (scsi_sense_valid(&sshdr))
2826                        sd_print_sense_hdr(sdkp, &sshdr);
2827
2828                return;
2829        }
2830
2831        offset = data.header_length + data.block_descriptor_length;
2832
2833        if ((buffer[offset] & 0x3f) != 0x0a) {
2834                sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2835                return;
2836        }
2837
2838        if ((buffer[offset + 5] & 0x80) == 0)
2839                return;
2840
2841        sdkp->ATO = 1;
2842
2843        return;
2844}
2845
2846/**
2847 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2848 * @sdkp: disk to query
2849 */
2850static void sd_read_block_limits(struct scsi_disk *sdkp)
2851{
2852        unsigned int sector_sz = sdkp->device->sector_size;
2853        const int vpd_len = 64;
2854        unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2855
2856        if (!buffer ||
2857            /* Block Limits VPD */
2858            scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2859                goto out;
2860
2861        blk_queue_io_min(sdkp->disk->queue,
2862                         get_unaligned_be16(&buffer[6]) * sector_sz);
2863
2864        sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2865        sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2866
2867        if (buffer[3] == 0x3c) {
2868                unsigned int lba_count, desc_count;
2869
2870                sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2871
2872                if (!sdkp->lbpme)
2873                        goto out;
2874
2875                lba_count = get_unaligned_be32(&buffer[20]);
2876                desc_count = get_unaligned_be32(&buffer[24]);
2877
2878                if (lba_count && desc_count)
2879                        sdkp->max_unmap_blocks = lba_count;
2880
2881                sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2882
2883                if (buffer[32] & 0x80)
2884                        sdkp->unmap_alignment =
2885                                get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2886
2887                if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2888
2889                        if (sdkp->max_unmap_blocks)
2890                                sd_config_discard(sdkp, SD_LBP_UNMAP);
2891                        else
2892                                sd_config_discard(sdkp, SD_LBP_WS16);
2893
2894                } else {        /* LBP VPD page tells us what to use */
2895                        if (sdkp->lbpu && sdkp->max_unmap_blocks)
2896                                sd_config_discard(sdkp, SD_LBP_UNMAP);
2897                        else if (sdkp->lbpws)
2898                                sd_config_discard(sdkp, SD_LBP_WS16);
2899                        else if (sdkp->lbpws10)
2900                                sd_config_discard(sdkp, SD_LBP_WS10);
2901                        else
2902                                sd_config_discard(sdkp, SD_LBP_DISABLE);
2903                }
2904        }
2905
2906 out:
2907        kfree(buffer);
2908}
2909
2910/**
2911 * sd_read_block_characteristics - Query block dev. characteristics
2912 * @sdkp: disk to query
2913 */
2914static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2915{
2916        struct request_queue *q = sdkp->disk->queue;
2917        unsigned char *buffer;
2918        u16 rot;
2919        const int vpd_len = 64;
2920
2921        buffer = kmalloc(vpd_len, GFP_KERNEL);
2922
2923        if (!buffer ||
2924            /* Block Device Characteristics VPD */
2925            scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2926                goto out;
2927
2928        rot = get_unaligned_be16(&buffer[4]);
2929
2930        if (rot == 1) {
2931                blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2932                blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2933        }
2934
2935        if (sdkp->device->type == TYPE_ZBC) {
2936                /* Host-managed */
2937                q->limits.zoned = BLK_ZONED_HM;
2938        } else {
2939                sdkp->zoned = (buffer[8] >> 4) & 3;
2940                if (sdkp->zoned == 1)
2941                        /* Host-aware */
2942                        q->limits.zoned = BLK_ZONED_HA;
2943                else
2944                        /*
2945                         * Treat drive-managed devices as
2946                         * regular block devices.
2947                         */
2948                        q->limits.zoned = BLK_ZONED_NONE;
2949        }
2950        if (blk_queue_is_zoned(q) && sdkp->first_scan)
2951                sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2952                      q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2953
2954 out:
2955        kfree(buffer);
2956}
2957
2958/**
2959 * sd_read_block_provisioning - Query provisioning VPD page
2960 * @sdkp: disk to query
2961 */
2962static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2963{
2964        unsigned char *buffer;
2965        const int vpd_len = 8;
2966
2967        if (sdkp->lbpme == 0)
2968                return;
2969
2970        buffer = kmalloc(vpd_len, GFP_KERNEL);
2971
2972        if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2973                goto out;
2974
2975        sdkp->lbpvpd    = 1;
2976        sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2977        sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2978        sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2979
2980 out:
2981        kfree(buffer);
2982}
2983
2984static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2985{
2986        struct scsi_device *sdev = sdkp->device;
2987
2988        if (sdev->host->no_write_same) {
2989                sdev->no_write_same = 1;
2990
2991                return;
2992        }
2993
2994        if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2995                /* too large values might cause issues with arcmsr */
2996                int vpd_buf_len = 64;
2997
2998                sdev->no_report_opcodes = 1;
2999
3000                /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3001                 * CODES is unsupported and the device has an ATA
3002                 * Information VPD page (SAT).
3003                 */
3004                if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3005                        sdev->no_write_same = 1;
3006        }
3007
3008        if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3009                sdkp->ws16 = 1;
3010
3011        if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3012                sdkp->ws10 = 1;
3013}
3014
3015static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3016{
3017        struct scsi_device *sdev = sdkp->device;
3018
3019        if (!sdev->security_supported)
3020                return;
3021
3022        if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3023                        SECURITY_PROTOCOL_IN) == 1 &&
3024            scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3025                        SECURITY_PROTOCOL_OUT) == 1)
3026                sdkp->security = 1;
3027}
3028
3029/*
3030 * Determine the device's preferred I/O size for reads and writes
3031 * unless the reported value is unreasonably small, large, not a
3032 * multiple of the physical block size, or simply garbage.
3033 */
3034static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
3035                                      unsigned int dev_max)
3036{
3037        struct scsi_device *sdp = sdkp->device;
3038        unsigned int opt_xfer_bytes =
3039                logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3040
3041        if (sdkp->opt_xfer_blocks == 0)
3042                return false;
3043
3044        if (sdkp->opt_xfer_blocks > dev_max) {
3045                sd_first_printk(KERN_WARNING, sdkp,
3046                                "Optimal transfer size %u logical blocks " \
3047                                "> dev_max (%u logical blocks)\n",
3048                                sdkp->opt_xfer_blocks, dev_max);
3049                return false;
3050        }
3051
3052        if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
3053                sd_first_printk(KERN_WARNING, sdkp,
3054                                "Optimal transfer size %u logical blocks " \
3055                                "> sd driver limit (%u logical blocks)\n",
3056                                sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
3057                return false;
3058        }
3059
3060        if (opt_xfer_bytes < PAGE_SIZE) {
3061                sd_first_printk(KERN_WARNING, sdkp,
3062                                "Optimal transfer size %u bytes < " \
3063                                "PAGE_SIZE (%u bytes)\n",
3064                                opt_xfer_bytes, (unsigned int)PAGE_SIZE);
3065                return false;
3066        }
3067
3068        if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
3069                sd_first_printk(KERN_WARNING, sdkp,
3070                                "Optimal transfer size %u bytes not a " \
3071                                "multiple of physical block size (%u bytes)\n",
3072                                opt_xfer_bytes, sdkp->physical_block_size);
3073                return false;
3074        }
3075
3076        sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
3077                        opt_xfer_bytes);
3078        return true;
3079}
3080
3081/**
3082 *      sd_revalidate_disk - called the first time a new disk is seen,
3083 *      performs disk spin up, read_capacity, etc.
3084 *      @disk: struct gendisk we care about
3085 **/
3086static int sd_revalidate_disk(struct gendisk *disk)
3087{
3088        struct scsi_disk *sdkp = scsi_disk(disk);
3089        struct scsi_device *sdp = sdkp->device;
3090        struct request_queue *q = sdkp->disk->queue;
3091        sector_t old_capacity = sdkp->capacity;
3092        unsigned char *buffer;
3093        unsigned int dev_max, rw_max;
3094
3095        SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3096                                      "sd_revalidate_disk\n"));
3097
3098        /*
3099         * If the device is offline, don't try and read capacity or any
3100         * of the other niceties.
3101         */
3102        if (!scsi_device_online(sdp))
3103                goto out;
3104
3105        buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3106        if (!buffer) {
3107                sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3108                          "allocation failure.\n");
3109                goto out;
3110        }
3111
3112        sd_spinup_disk(sdkp);
3113
3114        /*
3115         * Without media there is no reason to ask; moreover, some devices
3116         * react badly if we do.
3117         */
3118        if (sdkp->media_present) {
3119                sd_read_capacity(sdkp, buffer);
3120
3121                /*
3122                 * set the default to rotational.  All non-rotational devices
3123                 * support the block characteristics VPD page, which will
3124                 * cause this to be updated correctly and any device which
3125                 * doesn't support it should be treated as rotational.
3126                 */
3127                blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
3128                blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
3129
3130                if (scsi_device_supports_vpd(sdp)) {
3131                        sd_read_block_provisioning(sdkp);
3132                        sd_read_block_limits(sdkp);
3133                        sd_read_block_characteristics(sdkp);
3134                        sd_zbc_read_zones(sdkp, buffer);
3135                }
3136
3137                sd_print_capacity(sdkp, old_capacity);
3138
3139                sd_read_write_protect_flag(sdkp, buffer);
3140                sd_read_cache_type(sdkp, buffer);
3141                sd_read_app_tag_own(sdkp, buffer);
3142                sd_read_write_same(sdkp, buffer);
3143                sd_read_security(sdkp, buffer);
3144        }
3145
3146        /*
3147         * We now have all cache related info, determine how we deal
3148         * with flush requests.
3149         */
3150        sd_set_flush_flag(sdkp);
3151
3152        /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3153        dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3154
3155        /* Some devices report a maximum block count for READ/WRITE requests. */
3156        dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3157        q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3158
3159        if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
3160                q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3161                rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3162        } else
3163                rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3164                                      (sector_t)BLK_DEF_MAX_SECTORS);
3165
3166        /* Do not exceed controller limit */
3167        rw_max = min(rw_max, queue_max_hw_sectors(q));
3168
3169        /*
3170         * Only update max_sectors if previously unset or if the current value
3171         * exceeds the capabilities of the hardware.
3172         */
3173        if (sdkp->first_scan ||
3174            q->limits.max_sectors > q->limits.max_dev_sectors ||
3175            q->limits.max_sectors > q->limits.max_hw_sectors)
3176                q->limits.max_sectors = rw_max;
3177
3178        sdkp->first_scan = 0;
3179
3180        set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3181        sd_config_write_same(sdkp);
3182        kfree(buffer);
3183
3184 out:
3185        return 0;
3186}
3187
3188/**
3189 *      sd_unlock_native_capacity - unlock native capacity
3190 *      @disk: struct gendisk to set capacity for
3191 *
3192 *      Block layer calls this function if it detects that partitions
3193 *      on @disk reach beyond the end of the device.  If the SCSI host
3194 *      implements ->unlock_native_capacity() method, it's invoked to
3195 *      give it a chance to adjust the device capacity.
3196 *
3197 *      CONTEXT:
3198 *      Defined by block layer.  Might sleep.
3199 */
3200static void sd_unlock_native_capacity(struct gendisk *disk)
3201{
3202        struct scsi_device *sdev = scsi_disk(disk)->device;
3203
3204        if (sdev->host->hostt->unlock_native_capacity)
3205                sdev->host->hostt->unlock_native_capacity(sdev);
3206}
3207
3208/**
3209 *      sd_format_disk_name - format disk name
3210 *      @prefix: name prefix - ie. "sd" for SCSI disks
3211 *      @index: index of the disk to format name for
3212 *      @buf: output buffer
3213 *      @buflen: length of the output buffer
3214 *
3215 *      SCSI disk names starts at sda.  The 26th device is sdz and the
3216 *      27th is sdaa.  The last one for two lettered suffix is sdzz
3217 *      which is followed by sdaaa.
3218 *
3219 *      This is basically 26 base counting with one extra 'nil' entry
3220 *      at the beginning from the second digit on and can be
3221 *      determined using similar method as 26 base conversion with the
3222 *      index shifted -1 after each digit is computed.
3223 *
3224 *      CONTEXT:
3225 *      Don't care.
3226 *
3227 *      RETURNS:
3228 *      0 on success, -errno on failure.
3229 */
3230static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3231{
3232        const int base = 'z' - 'a' + 1;
3233        char *begin = buf + strlen(prefix);
3234        char *end = buf + buflen;
3235        char *p;
3236        int unit;
3237
3238        p = end - 1;
3239        *p = '\0';
3240        unit = base;
3241        do {
3242                if (p == begin)
3243                        return -EINVAL;
3244                *--p = 'a' + (index % unit);
3245                index = (index / unit) - 1;
3246        } while (index >= 0);
3247
3248        memmove(begin, p, end - p);
3249        memcpy(buf, prefix, strlen(prefix));
3250
3251        return 0;
3252}
3253
3254/**
3255 *      sd_probe - called during driver initialization and whenever a
3256 *      new scsi device is attached to the system. It is called once
3257 *      for each scsi device (not just disks) present.
3258 *      @dev: pointer to device object
3259 *
3260 *      Returns 0 if successful (or not interested in this scsi device 
3261 *      (e.g. scanner)); 1 when there is an error.
3262 *
3263 *      Note: this function is invoked from the scsi mid-level.
3264 *      This function sets up the mapping between a given 
3265 *      <host,channel,id,lun> (found in sdp) and new device name 
3266 *      (e.g. /dev/sda). More precisely it is the block device major 
3267 *      and minor number that is chosen here.
3268 *
3269 *      Assume sd_probe is not re-entrant (for time being)
3270 *      Also think about sd_probe() and sd_remove() running coincidentally.
3271 **/
3272static int sd_probe(struct device *dev)
3273{
3274        struct scsi_device *sdp = to_scsi_device(dev);
3275        struct scsi_disk *sdkp;
3276        struct gendisk *gd;
3277        int index;
3278        int error;
3279
3280        scsi_autopm_get_device(sdp);
3281        error = -ENODEV;
3282        if (sdp->type != TYPE_DISK &&
3283            sdp->type != TYPE_ZBC &&
3284            sdp->type != TYPE_MOD &&
3285            sdp->type != TYPE_RBC)
3286                goto out;
3287
3288#ifndef CONFIG_BLK_DEV_ZONED
3289        if (sdp->type == TYPE_ZBC)
3290                goto out;
3291#endif
3292        SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3293                                        "sd_probe\n"));
3294
3295        error = -ENOMEM;
3296        sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3297        if (!sdkp)
3298                goto out;
3299
3300        gd = alloc_disk(SD_MINORS);
3301        if (!gd)
3302                goto out_free;
3303
3304        index = ida_alloc(&sd_index_ida, GFP_KERNEL);
3305        if (index < 0) {
3306                sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3307                goto out_put;
3308        }
3309
3310        error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3311        if (error) {
3312                sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3313                goto out_free_index;
3314        }
3315
3316        sdkp->device = sdp;
3317        sdkp->driver = &sd_template;
3318        sdkp->disk = gd;
3319        sdkp->index = index;
3320        atomic_set(&sdkp->openers, 0);
3321        atomic_set(&sdkp->device->ioerr_cnt, 0);
3322
3323        if (!sdp->request_queue->rq_timeout) {
3324                if (sdp->type != TYPE_MOD)
3325                        blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3326                else
3327                        blk_queue_rq_timeout(sdp->request_queue,
3328                                             SD_MOD_TIMEOUT);
3329        }
3330
3331        device_initialize(&sdkp->dev);
3332        sdkp->dev.parent = dev;
3333        sdkp->dev.class = &sd_disk_class;
3334        dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3335
3336        error = device_add(&sdkp->dev);
3337        if (error)
3338                goto out_free_index;
3339
3340        get_device(dev);
3341        dev_set_drvdata(dev, sdkp);
3342
3343        gd->major = sd_major((index & 0xf0) >> 4);
3344        gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3345
3346        gd->fops = &sd_fops;
3347        gd->private_data = &sdkp->driver;
3348        gd->queue = sdkp->device->request_queue;
3349
3350        /* defaults, until the device tells us otherwise */
3351        sdp->sector_size = 512;
3352        sdkp->capacity = 0;
3353        sdkp->media_present = 1;
3354        sdkp->write_prot = 0;
3355        sdkp->cache_override = 0;
3356        sdkp->WCE = 0;
3357        sdkp->RCD = 0;
3358        sdkp->ATO = 0;
3359        sdkp->first_scan = 1;
3360        sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3361
3362        sd_revalidate_disk(gd);
3363
3364        gd->flags = GENHD_FL_EXT_DEVT;
3365        if (sdp->removable) {
3366                gd->flags |= GENHD_FL_REMOVABLE;
3367                gd->events |= DISK_EVENT_MEDIA_CHANGE;
3368                gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
3369        }
3370
3371        blk_pm_runtime_init(sdp->request_queue, dev);
3372        device_add_disk(dev, gd, NULL);
3373        if (sdkp->capacity)
3374                sd_dif_config_host(sdkp);
3375
3376        sd_revalidate_disk(gd);
3377
3378        if (sdkp->security) {
3379                sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit);
3380                if (sdkp->opal_dev)
3381                        sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
3382        }
3383
3384        sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3385                  sdp->removable ? "removable " : "");
3386        scsi_autopm_put_device(sdp);
3387
3388        return 0;
3389
3390 out_free_index:
3391        ida_free(&sd_index_ida, index);
3392 out_put:
3393        put_disk(gd);
3394 out_free:
3395        kfree(sdkp);
3396 out:
3397        scsi_autopm_put_device(sdp);
3398        return error;
3399}
3400
3401/**
3402 *      sd_remove - called whenever a scsi disk (previously recognized by
3403 *      sd_probe) is detached from the system. It is called (potentially
3404 *      multiple times) during sd module unload.
3405 *      @dev: pointer to device object
3406 *
3407 *      Note: this function is invoked from the scsi mid-level.
3408 *      This function potentially frees up a device name (e.g. /dev/sdc)
3409 *      that could be re-used by a subsequent sd_probe().
3410 *      This function is not called when the built-in sd driver is "exit-ed".
3411 **/
3412static int sd_remove(struct device *dev)
3413{
3414        struct scsi_disk *sdkp;
3415        dev_t devt;
3416
3417        sdkp = dev_get_drvdata(dev);
3418        devt = disk_devt(sdkp->disk);
3419        scsi_autopm_get_device(sdkp->device);
3420
3421        async_synchronize_full_domain(&scsi_sd_pm_domain);
3422        device_del(&sdkp->dev);
3423        del_gendisk(sdkp->disk);
3424        sd_shutdown(dev);
3425
3426        free_opal_dev(sdkp->opal_dev);
3427
3428        blk_register_region(devt, SD_MINORS, NULL,
3429                            sd_default_probe, NULL, NULL);
3430
3431        mutex_lock(&sd_ref_mutex);
3432        dev_set_drvdata(dev, NULL);
3433        put_device(&sdkp->dev);
3434        mutex_unlock(&sd_ref_mutex);
3435
3436        return 0;
3437}
3438
3439/**
3440 *      scsi_disk_release - Called to free the scsi_disk structure
3441 *      @dev: pointer to embedded class device
3442 *
3443 *      sd_ref_mutex must be held entering this routine.  Because it is
3444 *      called on last put, you should always use the scsi_disk_get()
3445 *      scsi_disk_put() helpers which manipulate the semaphore directly
3446 *      and never do a direct put_device.
3447 **/
3448static void scsi_disk_release(struct device *dev)
3449{
3450        struct scsi_disk *sdkp = to_scsi_disk(dev);
3451        struct gendisk *disk = sdkp->disk;
3452        struct request_queue *q = disk->queue;
3453
3454        ida_free(&sd_index_ida, sdkp->index);
3455
3456        /*
3457         * Wait until all requests that are in progress have completed.
3458         * This is necessary to avoid that e.g. scsi_end_request() crashes
3459         * due to clearing the disk->private_data pointer. Wait from inside
3460         * scsi_disk_release() instead of from sd_release() to avoid that
3461         * freezing and unfreezing the request queue affects user space I/O
3462         * in case multiple processes open a /dev/sd... node concurrently.
3463         */
3464        blk_mq_freeze_queue(q);
3465        blk_mq_unfreeze_queue(q);
3466
3467        disk->private_data = NULL;
3468        put_disk(disk);
3469        put_device(&sdkp->device->sdev_gendev);
3470
3471        kfree(sdkp);
3472}
3473
3474static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3475{
3476        unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3477        struct scsi_sense_hdr sshdr;
3478        struct scsi_device *sdp = sdkp->device;
3479        int res;
3480
3481        if (start)
3482                cmd[4] |= 1;    /* START */
3483
3484        if (sdp->start_stop_pwr_cond)
3485                cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3486
3487        if (!scsi_device_online(sdp))
3488                return -ENODEV;
3489
3490        res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3491                        SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
3492        if (res) {
3493                sd_print_result(sdkp, "Start/Stop Unit failed", res);
3494                if (driver_byte(res) == DRIVER_SENSE)
3495                        sd_print_sense_hdr(sdkp, &sshdr);
3496                if (scsi_sense_valid(&sshdr) &&
3497                        /* 0x3a is medium not present */
3498                        sshdr.asc == 0x3a)
3499                        res = 0;
3500        }
3501
3502        /* SCSI error codes must not go to the generic layer */
3503        if (res)
3504                return -EIO;
3505
3506        return 0;
3507}
3508
3509/*
3510 * Send a SYNCHRONIZE CACHE instruction down to the device through
3511 * the normal SCSI command structure.  Wait for the command to
3512 * complete.
3513 */
3514static void sd_shutdown(struct device *dev)
3515{
3516        struct scsi_disk *sdkp = dev_get_drvdata(dev);
3517
3518        if (!sdkp)
3519                return;         /* this can happen */
3520
3521        if (pm_runtime_suspended(dev))
3522                return;
3523
3524        if (sdkp->WCE && sdkp->media_present) {
3525                sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3526                sd_sync_cache(sdkp, NULL);
3527        }
3528
3529        if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3530                sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3531                sd_start_stop_device(sdkp, 0);
3532        }
3533}
3534
3535static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3536{
3537        struct scsi_disk *sdkp = dev_get_drvdata(dev);
3538        struct scsi_sense_hdr sshdr;
3539        int ret = 0;
3540
3541        if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
3542                return 0;
3543
3544        if (sdkp->WCE && sdkp->media_present) {
3545                sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3546                ret = sd_sync_cache(sdkp, &sshdr);
3547
3548                if (ret) {
3549                        /* ignore OFFLINE device */
3550                        if (ret == -ENODEV)
3551                                return 0;
3552
3553                        if (!scsi_sense_valid(&sshdr) ||
3554                            sshdr.sense_key != ILLEGAL_REQUEST)
3555                                return ret;
3556
3557                        /*
3558                         * sshdr.sense_key == ILLEGAL_REQUEST means this drive
3559                         * doesn't support sync. There's not much to do and
3560                         * suspend shouldn't fail.
3561                         */
3562                        ret = 0;
3563                }
3564        }
3565
3566        if (sdkp->device->manage_start_stop) {
3567                sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3568                /* an error is not worth aborting a system sleep */
3569                ret = sd_start_stop_device(sdkp, 0);
3570                if (ignore_stop_errors)
3571                        ret = 0;
3572        }
3573
3574        return ret;
3575}
3576
3577static int sd_suspend_system(struct device *dev)
3578{
3579        return sd_suspend_common(dev, true);
3580}
3581
3582static int sd_suspend_runtime(struct device *dev)
3583{
3584        return sd_suspend_common(dev, false);
3585}
3586
3587static int sd_resume(struct device *dev)
3588{
3589        struct scsi_disk *sdkp = dev_get_drvdata(dev);
3590        int ret;
3591
3592        if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
3593                return 0;
3594
3595        if (!sdkp->device->manage_start_stop)
3596                return 0;
3597
3598        sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3599        ret = sd_start_stop_device(sdkp, 1);
3600        if (!ret)
3601                opal_unlock_from_suspend(sdkp->opal_dev);
3602        return ret;
3603}
3604
3605/**
3606 *      init_sd - entry point for this driver (both when built in or when
3607 *      a module).
3608 *
3609 *      Note: this function registers this driver with the scsi mid-level.
3610 **/
3611static int __init init_sd(void)
3612{
3613        int majors = 0, i, err;
3614
3615        SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3616
3617        for (i = 0; i < SD_MAJORS; i++) {
3618                if (register_blkdev(sd_major(i), "sd") != 0)
3619                        continue;
3620                majors++;
3621                blk_register_region(sd_major(i), SD_MINORS, NULL,
3622                                    sd_default_probe, NULL, NULL);
3623        }
3624
3625        if (!majors)
3626                return -ENODEV;
3627
3628        err = class_register(&sd_disk_class);
3629        if (err)
3630                goto err_out;
3631
3632        sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3633                                         0, 0, NULL);
3634        if (!sd_cdb_cache) {
3635                printk(KERN_ERR "sd: can't init extended cdb cache\n");
3636                err = -ENOMEM;
3637                goto err_out_class;
3638        }
3639
3640        sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3641        if (!sd_cdb_pool) {
3642                printk(KERN_ERR "sd: can't init extended cdb pool\n");
3643                err = -ENOMEM;
3644                goto err_out_cache;
3645        }
3646
3647        sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
3648        if (!sd_page_pool) {
3649                printk(KERN_ERR "sd: can't init discard page pool\n");
3650                err = -ENOMEM;
3651                goto err_out_ppool;
3652        }
3653
3654        err = scsi_register_driver(&sd_template.gendrv);
3655        if (err)
3656                goto err_out_driver;
3657
3658        return 0;
3659
3660err_out_driver:
3661        mempool_destroy(sd_page_pool);
3662
3663err_out_ppool:
3664        mempool_destroy(sd_cdb_pool);
3665
3666err_out_cache:
3667        kmem_cache_destroy(sd_cdb_cache);
3668
3669err_out_class:
3670        class_unregister(&sd_disk_class);
3671err_out:
3672        for (i = 0; i < SD_MAJORS; i++)
3673                unregister_blkdev(sd_major(i), "sd");
3674        return err;
3675}
3676
3677/**
3678 *      exit_sd - exit point for this driver (when it is a module).
3679 *
3680 *      Note: this function unregisters this driver from the scsi mid-level.
3681 **/
3682static void __exit exit_sd(void)
3683{
3684        int i;
3685
3686        SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3687
3688        scsi_unregister_driver(&sd_template.gendrv);
3689        mempool_destroy(sd_cdb_pool);
3690        mempool_destroy(sd_page_pool);
3691        kmem_cache_destroy(sd_cdb_cache);
3692
3693        class_unregister(&sd_disk_class);
3694
3695        for (i = 0; i < SD_MAJORS; i++) {
3696                blk_unregister_region(sd_major(i), SD_MINORS);
3697                unregister_blkdev(sd_major(i), "sd");
3698        }
3699}
3700
3701module_init(init_sd);
3702module_exit(exit_sd);
3703
3704static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3705                               struct scsi_sense_hdr *sshdr)
3706{
3707        scsi_print_sense_hdr(sdkp->device,
3708                             sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3709}
3710
3711static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3712                            int result)
3713{
3714        const char *hb_string = scsi_hostbyte_string(result);
3715        const char *db_string = scsi_driverbyte_string(result);
3716
3717        if (hb_string || db_string)
3718                sd_printk(KERN_INFO, sdkp,
3719                          "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3720                          hb_string ? hb_string : "invalid",
3721                          db_string ? db_string : "invalid");
3722        else
3723                sd_printk(KERN_INFO, sdkp,
3724                          "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3725                          msg, host_byte(result), driver_byte(result));
3726}
3727
3728