linux/drivers/target/target_core_sbc.c
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   1/*
   2 * SCSI Block Commands (SBC) parsing and emulation.
   3 *
   4 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   5 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   6 * Copyright (c) 2007-2010 Rising Tide Systems
   7 * Copyright (c) 2008-2010 Linux-iSCSI.org
   8 *
   9 * Nicholas A. Bellinger <nab@kernel.org>
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License as published by
  13 * the Free Software Foundation; either version 2 of the License, or
  14 * (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with this program; if not, write to the Free Software
  23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24 */
  25
  26#include <linux/kernel.h>
  27#include <linux/module.h>
  28#include <linux/ratelimit.h>
  29#include <asm/unaligned.h>
  30#include <scsi/scsi.h>
  31
  32#include <target/target_core_base.h>
  33#include <target/target_core_backend.h>
  34#include <target/target_core_fabric.h>
  35
  36#include "target_core_internal.h"
  37#include "target_core_ua.h"
  38
  39
  40static int sbc_emulate_readcapacity(struct se_cmd *cmd)
  41{
  42        struct se_device *dev = cmd->se_dev;
  43        unsigned char *buf;
  44        unsigned long long blocks_long = dev->transport->get_blocks(dev);
  45        u32 blocks;
  46
  47        if (blocks_long >= 0x00000000ffffffff)
  48                blocks = 0xffffffff;
  49        else
  50                blocks = (u32)blocks_long;
  51
  52        buf = transport_kmap_data_sg(cmd);
  53
  54        buf[0] = (blocks >> 24) & 0xff;
  55        buf[1] = (blocks >> 16) & 0xff;
  56        buf[2] = (blocks >> 8) & 0xff;
  57        buf[3] = blocks & 0xff;
  58        buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
  59        buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
  60        buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
  61        buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
  62
  63        transport_kunmap_data_sg(cmd);
  64
  65        target_complete_cmd(cmd, GOOD);
  66        return 0;
  67}
  68
  69static int sbc_emulate_readcapacity_16(struct se_cmd *cmd)
  70{
  71        struct se_device *dev = cmd->se_dev;
  72        unsigned char *buf;
  73        unsigned long long blocks = dev->transport->get_blocks(dev);
  74
  75        buf = transport_kmap_data_sg(cmd);
  76
  77        buf[0] = (blocks >> 56) & 0xff;
  78        buf[1] = (blocks >> 48) & 0xff;
  79        buf[2] = (blocks >> 40) & 0xff;
  80        buf[3] = (blocks >> 32) & 0xff;
  81        buf[4] = (blocks >> 24) & 0xff;
  82        buf[5] = (blocks >> 16) & 0xff;
  83        buf[6] = (blocks >> 8) & 0xff;
  84        buf[7] = blocks & 0xff;
  85        buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
  86        buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
  87        buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
  88        buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
  89        /*
  90         * Set Thin Provisioning Enable bit following sbc3r22 in section
  91         * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
  92         */
  93        if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
  94                buf[14] = 0x80;
  95
  96        transport_kunmap_data_sg(cmd);
  97
  98        target_complete_cmd(cmd, GOOD);
  99        return 0;
 100}
 101
 102int spc_get_write_same_sectors(struct se_cmd *cmd)
 103{
 104        u32 num_blocks;
 105
 106        if (cmd->t_task_cdb[0] == WRITE_SAME)
 107                num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
 108        else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
 109                num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
 110        else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
 111                num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
 112
 113        /*
 114         * Use the explicit range when non zero is supplied, otherwise calculate
 115         * the remaining range based on ->get_blocks() - starting LBA.
 116         */
 117        if (num_blocks)
 118                return num_blocks;
 119
 120        return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
 121                cmd->t_task_lba + 1;
 122}
 123EXPORT_SYMBOL(spc_get_write_same_sectors);
 124
 125static int sbc_emulate_verify(struct se_cmd *cmd)
 126{
 127        target_complete_cmd(cmd, GOOD);
 128        return 0;
 129}
 130
 131static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
 132{
 133        return cmd->se_dev->se_sub_dev->se_dev_attrib.block_size * sectors;
 134}
 135
 136static int sbc_check_valid_sectors(struct se_cmd *cmd)
 137{
 138        struct se_device *dev = cmd->se_dev;
 139        unsigned long long end_lba;
 140        u32 sectors;
 141
 142        sectors = cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size;
 143        end_lba = dev->transport->get_blocks(dev) + 1;
 144
 145        if (cmd->t_task_lba + sectors > end_lba) {
 146                pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n",
 147                        cmd->t_task_lba, sectors, end_lba);
 148                return -EINVAL;
 149        }
 150
 151        return 0;
 152}
 153
 154static inline u32 transport_get_sectors_6(unsigned char *cdb)
 155{
 156        /*
 157         * Use 8-bit sector value.  SBC-3 says:
 158         *
 159         *   A TRANSFER LENGTH field set to zero specifies that 256
 160         *   logical blocks shall be written.  Any other value
 161         *   specifies the number of logical blocks that shall be
 162         *   written.
 163         */
 164        return cdb[4] ? : 256;
 165}
 166
 167static inline u32 transport_get_sectors_10(unsigned char *cdb)
 168{
 169        return (u32)(cdb[7] << 8) + cdb[8];
 170}
 171
 172static inline u32 transport_get_sectors_12(unsigned char *cdb)
 173{
 174        return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
 175}
 176
 177static inline u32 transport_get_sectors_16(unsigned char *cdb)
 178{
 179        return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
 180                    (cdb[12] << 8) + cdb[13];
 181}
 182
 183/*
 184 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
 185 */
 186static inline u32 transport_get_sectors_32(unsigned char *cdb)
 187{
 188        return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
 189                    (cdb[30] << 8) + cdb[31];
 190
 191}
 192
 193static inline u32 transport_lba_21(unsigned char *cdb)
 194{
 195        return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
 196}
 197
 198static inline u32 transport_lba_32(unsigned char *cdb)
 199{
 200        return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
 201}
 202
 203static inline unsigned long long transport_lba_64(unsigned char *cdb)
 204{
 205        unsigned int __v1, __v2;
 206
 207        __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
 208        __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
 209
 210        return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
 211}
 212
 213/*
 214 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
 215 */
 216static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
 217{
 218        unsigned int __v1, __v2;
 219
 220        __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
 221        __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
 222
 223        return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
 224}
 225
 226static int sbc_write_same_supported(struct se_device *dev,
 227                unsigned char *flags)
 228{
 229        if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
 230                pr_err("WRITE_SAME PBDATA and LBDATA"
 231                        " bits not supported for Block Discard"
 232                        " Emulation\n");
 233                return -ENOSYS;
 234        }
 235
 236        /*
 237         * Currently for the emulated case we only accept
 238         * tpws with the UNMAP=1 bit set.
 239         */
 240        if (!(flags[0] & 0x08)) {
 241                pr_err("WRITE_SAME w/o UNMAP bit not"
 242                        " supported for Block Discard Emulation\n");
 243                return -ENOSYS;
 244        }
 245
 246        return 0;
 247}
 248
 249static void xdreadwrite_callback(struct se_cmd *cmd)
 250{
 251        unsigned char *buf, *addr;
 252        struct scatterlist *sg;
 253        unsigned int offset;
 254        int i;
 255        int count;
 256        /*
 257         * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
 258         *
 259         * 1) read the specified logical block(s);
 260         * 2) transfer logical blocks from the data-out buffer;
 261         * 3) XOR the logical blocks transferred from the data-out buffer with
 262         *    the logical blocks read, storing the resulting XOR data in a buffer;
 263         * 4) if the DISABLE WRITE bit is set to zero, then write the logical
 264         *    blocks transferred from the data-out buffer; and
 265         * 5) transfer the resulting XOR data to the data-in buffer.
 266         */
 267        buf = kmalloc(cmd->data_length, GFP_KERNEL);
 268        if (!buf) {
 269                pr_err("Unable to allocate xor_callback buf\n");
 270                return;
 271        }
 272        /*
 273         * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
 274         * into the locally allocated *buf
 275         */
 276        sg_copy_to_buffer(cmd->t_data_sg,
 277                          cmd->t_data_nents,
 278                          buf,
 279                          cmd->data_length);
 280
 281        /*
 282         * Now perform the XOR against the BIDI read memory located at
 283         * cmd->t_mem_bidi_list
 284         */
 285
 286        offset = 0;
 287        for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
 288                addr = kmap_atomic(sg_page(sg));
 289                if (!addr)
 290                        goto out;
 291
 292                for (i = 0; i < sg->length; i++)
 293                        *(addr + sg->offset + i) ^= *(buf + offset + i);
 294
 295                offset += sg->length;
 296                kunmap_atomic(addr);
 297        }
 298
 299out:
 300        kfree(buf);
 301}
 302
 303int sbc_parse_cdb(struct se_cmd *cmd, struct spc_ops *ops)
 304{
 305        struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
 306        struct se_device *dev = cmd->se_dev;
 307        unsigned char *cdb = cmd->t_task_cdb;
 308        unsigned int size;
 309        u32 sectors = 0;
 310        int ret;
 311
 312        switch (cdb[0]) {
 313        case READ_6:
 314                sectors = transport_get_sectors_6(cdb);
 315                cmd->t_task_lba = transport_lba_21(cdb);
 316                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 317                cmd->execute_cmd = ops->execute_rw;
 318                break;
 319        case READ_10:
 320                sectors = transport_get_sectors_10(cdb);
 321                cmd->t_task_lba = transport_lba_32(cdb);
 322                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 323                cmd->execute_cmd = ops->execute_rw;
 324                break;
 325        case READ_12:
 326                sectors = transport_get_sectors_12(cdb);
 327                cmd->t_task_lba = transport_lba_32(cdb);
 328                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 329                cmd->execute_cmd = ops->execute_rw;
 330                break;
 331        case READ_16:
 332                sectors = transport_get_sectors_16(cdb);
 333                cmd->t_task_lba = transport_lba_64(cdb);
 334                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 335                cmd->execute_cmd = ops->execute_rw;
 336                break;
 337        case WRITE_6:
 338                sectors = transport_get_sectors_6(cdb);
 339                cmd->t_task_lba = transport_lba_21(cdb);
 340                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 341                cmd->execute_cmd = ops->execute_rw;
 342                break;
 343        case WRITE_10:
 344        case WRITE_VERIFY:
 345                sectors = transport_get_sectors_10(cdb);
 346                cmd->t_task_lba = transport_lba_32(cdb);
 347                if (cdb[1] & 0x8)
 348                        cmd->se_cmd_flags |= SCF_FUA;
 349                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 350                cmd->execute_cmd = ops->execute_rw;
 351                break;
 352        case WRITE_12:
 353                sectors = transport_get_sectors_12(cdb);
 354                cmd->t_task_lba = transport_lba_32(cdb);
 355                if (cdb[1] & 0x8)
 356                        cmd->se_cmd_flags |= SCF_FUA;
 357                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 358                cmd->execute_cmd = ops->execute_rw;
 359                break;
 360        case WRITE_16:
 361                sectors = transport_get_sectors_16(cdb);
 362                cmd->t_task_lba = transport_lba_64(cdb);
 363                if (cdb[1] & 0x8)
 364                        cmd->se_cmd_flags |= SCF_FUA;
 365                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 366                cmd->execute_cmd = ops->execute_rw;
 367                break;
 368        case XDWRITEREAD_10:
 369                if ((cmd->data_direction != DMA_TO_DEVICE) ||
 370                    !(cmd->se_cmd_flags & SCF_BIDI))
 371                        goto out_invalid_cdb_field;
 372                sectors = transport_get_sectors_10(cdb);
 373
 374                cmd->t_task_lba = transport_lba_32(cdb);
 375                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 376
 377                /*
 378                 * Setup BIDI XOR callback to be run after I/O completion.
 379                 */
 380                cmd->execute_cmd = ops->execute_rw;
 381                cmd->transport_complete_callback = &xdreadwrite_callback;
 382                if (cdb[1] & 0x8)
 383                        cmd->se_cmd_flags |= SCF_FUA;
 384                break;
 385        case VARIABLE_LENGTH_CMD:
 386        {
 387                u16 service_action = get_unaligned_be16(&cdb[8]);
 388                switch (service_action) {
 389                case XDWRITEREAD_32:
 390                        sectors = transport_get_sectors_32(cdb);
 391
 392                        /*
 393                         * Use WRITE_32 and READ_32 opcodes for the emulated
 394                         * XDWRITE_READ_32 logic.
 395                         */
 396                        cmd->t_task_lba = transport_lba_64_ext(cdb);
 397                        cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 398
 399                        /*
 400                         * Setup BIDI XOR callback to be run during after I/O
 401                         * completion.
 402                         */
 403                        cmd->execute_cmd = ops->execute_rw;
 404                        cmd->transport_complete_callback = &xdreadwrite_callback;
 405                        if (cdb[1] & 0x8)
 406                                cmd->se_cmd_flags |= SCF_FUA;
 407                        break;
 408                case WRITE_SAME_32:
 409                        if (!ops->execute_write_same)
 410                                goto out_unsupported_cdb;
 411
 412                        sectors = transport_get_sectors_32(cdb);
 413                        if (!sectors) {
 414                                pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
 415                                       " supported\n");
 416                                goto out_invalid_cdb_field;
 417                        }
 418
 419                        size = sbc_get_size(cmd, 1);
 420                        cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
 421
 422                        if (sbc_write_same_supported(dev, &cdb[10]) < 0)
 423                                goto out_unsupported_cdb;
 424                        cmd->execute_cmd = ops->execute_write_same;
 425                        break;
 426                default:
 427                        pr_err("VARIABLE_LENGTH_CMD service action"
 428                                " 0x%04x not supported\n", service_action);
 429                        goto out_unsupported_cdb;
 430                }
 431                break;
 432        }
 433        case READ_CAPACITY:
 434                size = READ_CAP_LEN;
 435                cmd->execute_cmd = sbc_emulate_readcapacity;
 436                break;
 437        case SERVICE_ACTION_IN:
 438                switch (cmd->t_task_cdb[1] & 0x1f) {
 439                case SAI_READ_CAPACITY_16:
 440                        cmd->execute_cmd = sbc_emulate_readcapacity_16;
 441                        break;
 442                default:
 443                        pr_err("Unsupported SA: 0x%02x\n",
 444                                cmd->t_task_cdb[1] & 0x1f);
 445                        goto out_invalid_cdb_field;
 446                }
 447                size = (cdb[10] << 24) | (cdb[11] << 16) |
 448                       (cdb[12] << 8) | cdb[13];
 449                break;
 450        case SYNCHRONIZE_CACHE:
 451        case SYNCHRONIZE_CACHE_16:
 452                if (!ops->execute_sync_cache)
 453                        goto out_unsupported_cdb;
 454
 455                /*
 456                 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
 457                 */
 458                if (cdb[0] == SYNCHRONIZE_CACHE) {
 459                        sectors = transport_get_sectors_10(cdb);
 460                        cmd->t_task_lba = transport_lba_32(cdb);
 461                } else {
 462                        sectors = transport_get_sectors_16(cdb);
 463                        cmd->t_task_lba = transport_lba_64(cdb);
 464                }
 465
 466                size = sbc_get_size(cmd, sectors);
 467
 468                /*
 469                 * Check to ensure that LBA + Range does not exceed past end of
 470                 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
 471                 */
 472                if (cmd->t_task_lba || sectors) {
 473                        if (sbc_check_valid_sectors(cmd) < 0)
 474                                goto out_invalid_cdb_field;
 475                }
 476                cmd->execute_cmd = ops->execute_sync_cache;
 477                break;
 478        case UNMAP:
 479                if (!ops->execute_unmap)
 480                        goto out_unsupported_cdb;
 481
 482                size = get_unaligned_be16(&cdb[7]);
 483                cmd->execute_cmd = ops->execute_unmap;
 484                break;
 485        case WRITE_SAME_16:
 486                if (!ops->execute_write_same)
 487                        goto out_unsupported_cdb;
 488
 489                sectors = transport_get_sectors_16(cdb);
 490                if (!sectors) {
 491                        pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
 492                        goto out_invalid_cdb_field;
 493                }
 494
 495                size = sbc_get_size(cmd, 1);
 496                cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
 497
 498                if (sbc_write_same_supported(dev, &cdb[1]) < 0)
 499                        goto out_unsupported_cdb;
 500                cmd->execute_cmd = ops->execute_write_same;
 501                break;
 502        case WRITE_SAME:
 503                if (!ops->execute_write_same)
 504                        goto out_unsupported_cdb;
 505
 506                sectors = transport_get_sectors_10(cdb);
 507                if (!sectors) {
 508                        pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
 509                        goto out_invalid_cdb_field;
 510                }
 511
 512                size = sbc_get_size(cmd, 1);
 513                cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
 514
 515                /*
 516                 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
 517                 * of byte 1 bit 3 UNMAP instead of original reserved field
 518                 */
 519                if (sbc_write_same_supported(dev, &cdb[1]) < 0)
 520                        goto out_unsupported_cdb;
 521                cmd->execute_cmd = ops->execute_write_same;
 522                break;
 523        case VERIFY:
 524                size = 0;
 525                cmd->execute_cmd = sbc_emulate_verify;
 526                break;
 527        default:
 528                ret = spc_parse_cdb(cmd, &size);
 529                if (ret)
 530                        return ret;
 531        }
 532
 533        /* reject any command that we don't have a handler for */
 534        if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
 535                goto out_unsupported_cdb;
 536
 537        if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
 538                unsigned long long end_lba;
 539
 540                if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
 541                        printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
 542                                " big sectors %u exceeds fabric_max_sectors:"
 543                                " %u\n", cdb[0], sectors,
 544                                su_dev->se_dev_attrib.fabric_max_sectors);
 545                        goto out_invalid_cdb_field;
 546                }
 547                if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
 548                        printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
 549                                " big sectors %u exceeds backend hw_max_sectors:"
 550                                " %u\n", cdb[0], sectors,
 551                                su_dev->se_dev_attrib.hw_max_sectors);
 552                        goto out_invalid_cdb_field;
 553                }
 554
 555                end_lba = dev->transport->get_blocks(dev) + 1;
 556                if (cmd->t_task_lba + sectors > end_lba) {
 557                        pr_err("cmd exceeds last lba %llu "
 558                                "(lba %llu, sectors %u)\n",
 559                                end_lba, cmd->t_task_lba, sectors);
 560                        goto out_invalid_cdb_field;
 561                }
 562
 563                size = sbc_get_size(cmd, sectors);
 564        }
 565
 566        ret = target_cmd_size_check(cmd, size);
 567        if (ret < 0)
 568                return ret;
 569
 570        return 0;
 571
 572out_unsupported_cdb:
 573        cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 574        cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
 575        return -EINVAL;
 576out_invalid_cdb_field:
 577        cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 578        cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
 579        return -EINVAL;
 580}
 581EXPORT_SYMBOL(sbc_parse_cdb);
 582
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