linux/drivers/target/target_core_sbc.c
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   1/*
   2 * SCSI Block Commands (SBC) parsing and emulation.
   3 *
   4 * (c) Copyright 2002-2012 RisingTide Systems LLC.
   5 *
   6 * Nicholas A. Bellinger <nab@kernel.org>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21 */
  22
  23#include <linux/kernel.h>
  24#include <linux/module.h>
  25#include <linux/ratelimit.h>
  26#include <asm/unaligned.h>
  27#include <scsi/scsi.h>
  28
  29#include <target/target_core_base.h>
  30#include <target/target_core_backend.h>
  31#include <target/target_core_fabric.h>
  32
  33#include "target_core_internal.h"
  34#include "target_core_ua.h"
  35
  36
  37static sense_reason_t
  38sbc_emulate_readcapacity(struct se_cmd *cmd)
  39{
  40        struct se_device *dev = cmd->se_dev;
  41        unsigned long long blocks_long = dev->transport->get_blocks(dev);
  42        unsigned char *rbuf;
  43        unsigned char buf[8];
  44        u32 blocks;
  45
  46        if (blocks_long >= 0x00000000ffffffff)
  47                blocks = 0xffffffff;
  48        else
  49                blocks = (u32)blocks_long;
  50
  51        buf[0] = (blocks >> 24) & 0xff;
  52        buf[1] = (blocks >> 16) & 0xff;
  53        buf[2] = (blocks >> 8) & 0xff;
  54        buf[3] = blocks & 0xff;
  55        buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
  56        buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
  57        buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
  58        buf[7] = dev->dev_attrib.block_size & 0xff;
  59
  60        rbuf = transport_kmap_data_sg(cmd);
  61        if (rbuf) {
  62                memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
  63                transport_kunmap_data_sg(cmd);
  64        }
  65
  66        target_complete_cmd(cmd, GOOD);
  67        return 0;
  68}
  69
  70static sense_reason_t
  71sbc_emulate_readcapacity_16(struct se_cmd *cmd)
  72{
  73        struct se_device *dev = cmd->se_dev;
  74        unsigned char *rbuf;
  75        unsigned char buf[32];
  76        unsigned long long blocks = dev->transport->get_blocks(dev);
  77
  78        memset(buf, 0, sizeof(buf));
  79        buf[0] = (blocks >> 56) & 0xff;
  80        buf[1] = (blocks >> 48) & 0xff;
  81        buf[2] = (blocks >> 40) & 0xff;
  82        buf[3] = (blocks >> 32) & 0xff;
  83        buf[4] = (blocks >> 24) & 0xff;
  84        buf[5] = (blocks >> 16) & 0xff;
  85        buf[6] = (blocks >> 8) & 0xff;
  86        buf[7] = blocks & 0xff;
  87        buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
  88        buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
  89        buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
  90        buf[11] = dev->dev_attrib.block_size & 0xff;
  91        /*
  92         * Set Thin Provisioning Enable bit following sbc3r22 in section
  93         * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
  94         */
  95        if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
  96                buf[14] = 0x80;
  97
  98        rbuf = transport_kmap_data_sg(cmd);
  99        if (rbuf) {
 100                memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
 101                transport_kunmap_data_sg(cmd);
 102        }
 103
 104        target_complete_cmd(cmd, GOOD);
 105        return 0;
 106}
 107
 108sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
 109{
 110        u32 num_blocks;
 111
 112        if (cmd->t_task_cdb[0] == WRITE_SAME)
 113                num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
 114        else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
 115                num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
 116        else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
 117                num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
 118
 119        /*
 120         * Use the explicit range when non zero is supplied, otherwise calculate
 121         * the remaining range based on ->get_blocks() - starting LBA.
 122         */
 123        if (num_blocks)
 124                return num_blocks;
 125
 126        return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
 127                cmd->t_task_lba + 1;
 128}
 129EXPORT_SYMBOL(sbc_get_write_same_sectors);
 130
 131static sense_reason_t
 132sbc_emulate_noop(struct se_cmd *cmd)
 133{
 134        target_complete_cmd(cmd, GOOD);
 135        return 0;
 136}
 137
 138static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
 139{
 140        return cmd->se_dev->dev_attrib.block_size * sectors;
 141}
 142
 143static int sbc_check_valid_sectors(struct se_cmd *cmd)
 144{
 145        struct se_device *dev = cmd->se_dev;
 146        unsigned long long end_lba;
 147        u32 sectors;
 148
 149        sectors = cmd->data_length / dev->dev_attrib.block_size;
 150        end_lba = dev->transport->get_blocks(dev) + 1;
 151
 152        if (cmd->t_task_lba + sectors > end_lba) {
 153                pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n",
 154                        cmd->t_task_lba, sectors, end_lba);
 155                return -EINVAL;
 156        }
 157
 158        return 0;
 159}
 160
 161static inline u32 transport_get_sectors_6(unsigned char *cdb)
 162{
 163        /*
 164         * Use 8-bit sector value.  SBC-3 says:
 165         *
 166         *   A TRANSFER LENGTH field set to zero specifies that 256
 167         *   logical blocks shall be written.  Any other value
 168         *   specifies the number of logical blocks that shall be
 169         *   written.
 170         */
 171        return cdb[4] ? : 256;
 172}
 173
 174static inline u32 transport_get_sectors_10(unsigned char *cdb)
 175{
 176        return (u32)(cdb[7] << 8) + cdb[8];
 177}
 178
 179static inline u32 transport_get_sectors_12(unsigned char *cdb)
 180{
 181        return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
 182}
 183
 184static inline u32 transport_get_sectors_16(unsigned char *cdb)
 185{
 186        return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
 187                    (cdb[12] << 8) + cdb[13];
 188}
 189
 190/*
 191 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
 192 */
 193static inline u32 transport_get_sectors_32(unsigned char *cdb)
 194{
 195        return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
 196                    (cdb[30] << 8) + cdb[31];
 197
 198}
 199
 200static inline u32 transport_lba_21(unsigned char *cdb)
 201{
 202        return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
 203}
 204
 205static inline u32 transport_lba_32(unsigned char *cdb)
 206{
 207        return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
 208}
 209
 210static inline unsigned long long transport_lba_64(unsigned char *cdb)
 211{
 212        unsigned int __v1, __v2;
 213
 214        __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
 215        __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
 216
 217        return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
 218}
 219
 220/*
 221 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
 222 */
 223static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
 224{
 225        unsigned int __v1, __v2;
 226
 227        __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
 228        __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
 229
 230        return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
 231}
 232
 233static sense_reason_t
 234sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
 235{
 236        unsigned int sectors = sbc_get_write_same_sectors(cmd);
 237
 238        if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
 239                pr_err("WRITE_SAME PBDATA and LBDATA"
 240                        " bits not supported for Block Discard"
 241                        " Emulation\n");
 242                return TCM_UNSUPPORTED_SCSI_OPCODE;
 243        }
 244        if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
 245                pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
 246                        sectors, cmd->se_dev->dev_attrib.max_write_same_len);
 247                return TCM_INVALID_CDB_FIELD;
 248        }
 249        /*
 250         * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
 251         * translated into block discard requests within backend code.
 252         */
 253        if (flags[0] & 0x08) {
 254                if (!ops->execute_write_same_unmap)
 255                        return TCM_UNSUPPORTED_SCSI_OPCODE;
 256
 257                cmd->execute_cmd = ops->execute_write_same_unmap;
 258                return 0;
 259        }
 260        if (!ops->execute_write_same)
 261                return TCM_UNSUPPORTED_SCSI_OPCODE;
 262
 263        cmd->execute_cmd = ops->execute_write_same;
 264        return 0;
 265}
 266
 267static void xdreadwrite_callback(struct se_cmd *cmd)
 268{
 269        unsigned char *buf, *addr;
 270        struct scatterlist *sg;
 271        unsigned int offset;
 272        int i;
 273        int count;
 274        /*
 275         * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
 276         *
 277         * 1) read the specified logical block(s);
 278         * 2) transfer logical blocks from the data-out buffer;
 279         * 3) XOR the logical blocks transferred from the data-out buffer with
 280         *    the logical blocks read, storing the resulting XOR data in a buffer;
 281         * 4) if the DISABLE WRITE bit is set to zero, then write the logical
 282         *    blocks transferred from the data-out buffer; and
 283         * 5) transfer the resulting XOR data to the data-in buffer.
 284         */
 285        buf = kmalloc(cmd->data_length, GFP_KERNEL);
 286        if (!buf) {
 287                pr_err("Unable to allocate xor_callback buf\n");
 288                return;
 289        }
 290        /*
 291         * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
 292         * into the locally allocated *buf
 293         */
 294        sg_copy_to_buffer(cmd->t_data_sg,
 295                          cmd->t_data_nents,
 296                          buf,
 297                          cmd->data_length);
 298
 299        /*
 300         * Now perform the XOR against the BIDI read memory located at
 301         * cmd->t_mem_bidi_list
 302         */
 303
 304        offset = 0;
 305        for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
 306                addr = kmap_atomic(sg_page(sg));
 307                if (!addr)
 308                        goto out;
 309
 310                for (i = 0; i < sg->length; i++)
 311                        *(addr + sg->offset + i) ^= *(buf + offset + i);
 312
 313                offset += sg->length;
 314                kunmap_atomic(addr);
 315        }
 316
 317out:
 318        kfree(buf);
 319}
 320
 321sense_reason_t
 322sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
 323{
 324        struct se_device *dev = cmd->se_dev;
 325        unsigned char *cdb = cmd->t_task_cdb;
 326        unsigned int size;
 327        u32 sectors = 0;
 328        sense_reason_t ret;
 329
 330        switch (cdb[0]) {
 331        case READ_6:
 332                sectors = transport_get_sectors_6(cdb);
 333                cmd->t_task_lba = transport_lba_21(cdb);
 334                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 335                cmd->execute_cmd = ops->execute_rw;
 336                break;
 337        case READ_10:
 338                sectors = transport_get_sectors_10(cdb);
 339                cmd->t_task_lba = transport_lba_32(cdb);
 340                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 341                cmd->execute_cmd = ops->execute_rw;
 342                break;
 343        case READ_12:
 344                sectors = transport_get_sectors_12(cdb);
 345                cmd->t_task_lba = transport_lba_32(cdb);
 346                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 347                cmd->execute_cmd = ops->execute_rw;
 348                break;
 349        case READ_16:
 350                sectors = transport_get_sectors_16(cdb);
 351                cmd->t_task_lba = transport_lba_64(cdb);
 352                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 353                cmd->execute_cmd = ops->execute_rw;
 354                break;
 355        case WRITE_6:
 356                sectors = transport_get_sectors_6(cdb);
 357                cmd->t_task_lba = transport_lba_21(cdb);
 358                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 359                cmd->execute_cmd = ops->execute_rw;
 360                break;
 361        case WRITE_10:
 362        case WRITE_VERIFY:
 363                sectors = transport_get_sectors_10(cdb);
 364                cmd->t_task_lba = transport_lba_32(cdb);
 365                if (cdb[1] & 0x8)
 366                        cmd->se_cmd_flags |= SCF_FUA;
 367                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 368                cmd->execute_cmd = ops->execute_rw;
 369                break;
 370        case WRITE_12:
 371                sectors = transport_get_sectors_12(cdb);
 372                cmd->t_task_lba = transport_lba_32(cdb);
 373                if (cdb[1] & 0x8)
 374                        cmd->se_cmd_flags |= SCF_FUA;
 375                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 376                cmd->execute_cmd = ops->execute_rw;
 377                break;
 378        case WRITE_16:
 379                sectors = transport_get_sectors_16(cdb);
 380                cmd->t_task_lba = transport_lba_64(cdb);
 381                if (cdb[1] & 0x8)
 382                        cmd->se_cmd_flags |= SCF_FUA;
 383                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 384                cmd->execute_cmd = ops->execute_rw;
 385                break;
 386        case XDWRITEREAD_10:
 387                if (cmd->data_direction != DMA_TO_DEVICE ||
 388                    !(cmd->se_cmd_flags & SCF_BIDI))
 389                        return TCM_INVALID_CDB_FIELD;
 390                sectors = transport_get_sectors_10(cdb);
 391
 392                cmd->t_task_lba = transport_lba_32(cdb);
 393                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 394
 395                /*
 396                 * Setup BIDI XOR callback to be run after I/O completion.
 397                 */
 398                cmd->execute_cmd = ops->execute_rw;
 399                cmd->transport_complete_callback = &xdreadwrite_callback;
 400                if (cdb[1] & 0x8)
 401                        cmd->se_cmd_flags |= SCF_FUA;
 402                break;
 403        case VARIABLE_LENGTH_CMD:
 404        {
 405                u16 service_action = get_unaligned_be16(&cdb[8]);
 406                switch (service_action) {
 407                case XDWRITEREAD_32:
 408                        sectors = transport_get_sectors_32(cdb);
 409
 410                        /*
 411                         * Use WRITE_32 and READ_32 opcodes for the emulated
 412                         * XDWRITE_READ_32 logic.
 413                         */
 414                        cmd->t_task_lba = transport_lba_64_ext(cdb);
 415                        cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 416
 417                        /*
 418                         * Setup BIDI XOR callback to be run during after I/O
 419                         * completion.
 420                         */
 421                        cmd->execute_cmd = ops->execute_rw;
 422                        cmd->transport_complete_callback = &xdreadwrite_callback;
 423                        if (cdb[1] & 0x8)
 424                                cmd->se_cmd_flags |= SCF_FUA;
 425                        break;
 426                case WRITE_SAME_32:
 427                        sectors = transport_get_sectors_32(cdb);
 428                        if (!sectors) {
 429                                pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
 430                                       " supported\n");
 431                                return TCM_INVALID_CDB_FIELD;
 432                        }
 433
 434                        size = sbc_get_size(cmd, 1);
 435                        cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
 436
 437                        ret = sbc_setup_write_same(cmd, &cdb[10], ops);
 438                        if (ret)
 439                                return ret;
 440                        break;
 441                default:
 442                        pr_err("VARIABLE_LENGTH_CMD service action"
 443                                " 0x%04x not supported\n", service_action);
 444                        return TCM_UNSUPPORTED_SCSI_OPCODE;
 445                }
 446                break;
 447        }
 448        case READ_CAPACITY:
 449                size = READ_CAP_LEN;
 450                cmd->execute_cmd = sbc_emulate_readcapacity;
 451                break;
 452        case SERVICE_ACTION_IN:
 453                switch (cmd->t_task_cdb[1] & 0x1f) {
 454                case SAI_READ_CAPACITY_16:
 455                        cmd->execute_cmd = sbc_emulate_readcapacity_16;
 456                        break;
 457                default:
 458                        pr_err("Unsupported SA: 0x%02x\n",
 459                                cmd->t_task_cdb[1] & 0x1f);
 460                        return TCM_INVALID_CDB_FIELD;
 461                }
 462                size = (cdb[10] << 24) | (cdb[11] << 16) |
 463                       (cdb[12] << 8) | cdb[13];
 464                break;
 465        case SYNCHRONIZE_CACHE:
 466        case SYNCHRONIZE_CACHE_16:
 467                if (!ops->execute_sync_cache) {
 468                        size = 0;
 469                        cmd->execute_cmd = sbc_emulate_noop;
 470                        break;
 471                }
 472
 473                /*
 474                 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
 475                 */
 476                if (cdb[0] == SYNCHRONIZE_CACHE) {
 477                        sectors = transport_get_sectors_10(cdb);
 478                        cmd->t_task_lba = transport_lba_32(cdb);
 479                } else {
 480                        sectors = transport_get_sectors_16(cdb);
 481                        cmd->t_task_lba = transport_lba_64(cdb);
 482                }
 483
 484                size = sbc_get_size(cmd, sectors);
 485
 486                /*
 487                 * Check to ensure that LBA + Range does not exceed past end of
 488                 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
 489                 */
 490                if (cmd->t_task_lba || sectors) {
 491                        if (sbc_check_valid_sectors(cmd) < 0)
 492                                return TCM_ADDRESS_OUT_OF_RANGE;
 493                }
 494                cmd->execute_cmd = ops->execute_sync_cache;
 495                break;
 496        case UNMAP:
 497                if (!ops->execute_unmap)
 498                        return TCM_UNSUPPORTED_SCSI_OPCODE;
 499
 500                size = get_unaligned_be16(&cdb[7]);
 501                cmd->execute_cmd = ops->execute_unmap;
 502                break;
 503        case WRITE_SAME_16:
 504                sectors = transport_get_sectors_16(cdb);
 505                if (!sectors) {
 506                        pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
 507                        return TCM_INVALID_CDB_FIELD;
 508                }
 509
 510                size = sbc_get_size(cmd, 1);
 511                cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
 512
 513                ret = sbc_setup_write_same(cmd, &cdb[1], ops);
 514                if (ret)
 515                        return ret;
 516                break;
 517        case WRITE_SAME:
 518                sectors = transport_get_sectors_10(cdb);
 519                if (!sectors) {
 520                        pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
 521                        return TCM_INVALID_CDB_FIELD;
 522                }
 523
 524                size = sbc_get_size(cmd, 1);
 525                cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
 526
 527                /*
 528                 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
 529                 * of byte 1 bit 3 UNMAP instead of original reserved field
 530                 */
 531                ret = sbc_setup_write_same(cmd, &cdb[1], ops);
 532                if (ret)
 533                        return ret;
 534                break;
 535        case VERIFY:
 536                size = 0;
 537                cmd->execute_cmd = sbc_emulate_noop;
 538                break;
 539        case REZERO_UNIT:
 540        case SEEK_6:
 541        case SEEK_10:
 542                /*
 543                 * There are still clients out there which use these old SCSI-2
 544                 * commands. This mainly happens when running VMs with legacy
 545                 * guest systems, connected via SCSI command pass-through to
 546                 * iSCSI targets. Make them happy and return status GOOD.
 547                 */
 548                size = 0;
 549                cmd->execute_cmd = sbc_emulate_noop;
 550                break;
 551        default:
 552                ret = spc_parse_cdb(cmd, &size);
 553                if (ret)
 554                        return ret;
 555        }
 556
 557        /* reject any command that we don't have a handler for */
 558        if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
 559                return TCM_UNSUPPORTED_SCSI_OPCODE;
 560
 561        if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
 562                unsigned long long end_lba;
 563
 564                if (sectors > dev->dev_attrib.fabric_max_sectors) {
 565                        printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
 566                                " big sectors %u exceeds fabric_max_sectors:"
 567                                " %u\n", cdb[0], sectors,
 568                                dev->dev_attrib.fabric_max_sectors);
 569                        return TCM_INVALID_CDB_FIELD;
 570                }
 571                if (sectors > dev->dev_attrib.hw_max_sectors) {
 572                        printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
 573                                " big sectors %u exceeds backend hw_max_sectors:"
 574                                " %u\n", cdb[0], sectors,
 575                                dev->dev_attrib.hw_max_sectors);
 576                        return TCM_INVALID_CDB_FIELD;
 577                }
 578
 579                end_lba = dev->transport->get_blocks(dev) + 1;
 580                if (cmd->t_task_lba + sectors > end_lba) {
 581                        pr_err("cmd exceeds last lba %llu "
 582                                "(lba %llu, sectors %u)\n",
 583                                end_lba, cmd->t_task_lba, sectors);
 584                        return TCM_INVALID_CDB_FIELD;
 585                }
 586
 587                size = sbc_get_size(cmd, sectors);
 588        }
 589
 590        return target_cmd_size_check(cmd, size);
 591}
 592EXPORT_SYMBOL(sbc_parse_cdb);
 593
 594u32 sbc_get_device_type(struct se_device *dev)
 595{
 596        return TYPE_DISK;
 597}
 598EXPORT_SYMBOL(sbc_get_device_type);
 599
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