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 long long blocks_long = dev->transport->get_blocks(dev);
  44        unsigned char *rbuf;
  45        unsigned char buf[8];
  46        u32 blocks;
  47
  48        if (blocks_long >= 0x00000000ffffffff)
  49                blocks = 0xffffffff;
  50        else
  51                blocks = (u32)blocks_long;
  52
  53        buf[0] = (blocks >> 24) & 0xff;
  54        buf[1] = (blocks >> 16) & 0xff;
  55        buf[2] = (blocks >> 8) & 0xff;
  56        buf[3] = blocks & 0xff;
  57        buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
  58        buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
  59        buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
  60        buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
  61
  62        rbuf = transport_kmap_data_sg(cmd);
  63        if (rbuf) {
  64                memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
  65                transport_kunmap_data_sg(cmd);
  66        }
  67
  68        target_complete_cmd(cmd, GOOD);
  69        return 0;
  70}
  71
  72static int sbc_emulate_readcapacity_16(struct se_cmd *cmd)
  73{
  74        struct se_device *dev = cmd->se_dev;
  75        unsigned char *rbuf;
  76        unsigned char buf[32];
  77        unsigned long long blocks = dev->transport->get_blocks(dev);
  78
  79        memset(buf, 0, sizeof(buf));
  80        buf[0] = (blocks >> 56) & 0xff;
  81        buf[1] = (blocks >> 48) & 0xff;
  82        buf[2] = (blocks >> 40) & 0xff;
  83        buf[3] = (blocks >> 32) & 0xff;
  84        buf[4] = (blocks >> 24) & 0xff;
  85        buf[5] = (blocks >> 16) & 0xff;
  86        buf[6] = (blocks >> 8) & 0xff;
  87        buf[7] = blocks & 0xff;
  88        buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
  89        buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
  90        buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
  91        buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
  92        /*
  93         * Set Thin Provisioning Enable bit following sbc3r22 in section
  94         * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
  95         */
  96        if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
  97                buf[14] = 0x80;
  98
  99        rbuf = transport_kmap_data_sg(cmd);
 100        if (rbuf) {
 101                memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
 102                transport_kunmap_data_sg(cmd);
 103        }
 104
 105        target_complete_cmd(cmd, GOOD);
 106        return 0;
 107}
 108
 109int spc_get_write_same_sectors(struct se_cmd *cmd)
 110{
 111        u32 num_blocks;
 112
 113        if (cmd->t_task_cdb[0] == WRITE_SAME)
 114                num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
 115        else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
 116                num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
 117        else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
 118                num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
 119
 120        /*
 121         * Use the explicit range when non zero is supplied, otherwise calculate
 122         * the remaining range based on ->get_blocks() - starting LBA.
 123         */
 124        if (num_blocks)
 125                return num_blocks;
 126
 127        return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
 128                cmd->t_task_lba + 1;
 129}
 130EXPORT_SYMBOL(spc_get_write_same_sectors);
 131
 132static int sbc_emulate_verify(struct se_cmd *cmd)
 133{
 134        target_complete_cmd(cmd, GOOD);
 135        return 0;
 136}
 137
 138static int sbc_emulate_noop(struct se_cmd *cmd)
 139{
 140        target_complete_cmd(cmd, GOOD);
 141        return 0;
 142}
 143
 144static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
 145{
 146        return cmd->se_dev->se_sub_dev->se_dev_attrib.block_size * sectors;
 147}
 148
 149static int sbc_check_valid_sectors(struct se_cmd *cmd)
 150{
 151        struct se_device *dev = cmd->se_dev;
 152        unsigned long long end_lba;
 153        u32 sectors;
 154
 155        sectors = cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size;
 156        end_lba = dev->transport->get_blocks(dev) + 1;
 157
 158        if (cmd->t_task_lba + sectors > end_lba) {
 159                pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n",
 160                        cmd->t_task_lba, sectors, end_lba);
 161                return -EINVAL;
 162        }
 163
 164        return 0;
 165}
 166
 167static inline u32 transport_get_sectors_6(unsigned char *cdb)
 168{
 169        /*
 170         * Use 8-bit sector value.  SBC-3 says:
 171         *
 172         *   A TRANSFER LENGTH field set to zero specifies that 256
 173         *   logical blocks shall be written.  Any other value
 174         *   specifies the number of logical blocks that shall be
 175         *   written.
 176         */
 177        return cdb[4] ? : 256;
 178}
 179
 180static inline u32 transport_get_sectors_10(unsigned char *cdb)
 181{
 182        return (u32)(cdb[7] << 8) + cdb[8];
 183}
 184
 185static inline u32 transport_get_sectors_12(unsigned char *cdb)
 186{
 187        return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
 188}
 189
 190static inline u32 transport_get_sectors_16(unsigned char *cdb)
 191{
 192        return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
 193                    (cdb[12] << 8) + cdb[13];
 194}
 195
 196/*
 197 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
 198 */
 199static inline u32 transport_get_sectors_32(unsigned char *cdb)
 200{
 201        return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
 202                    (cdb[30] << 8) + cdb[31];
 203
 204}
 205
 206static inline u32 transport_lba_21(unsigned char *cdb)
 207{
 208        return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
 209}
 210
 211static inline u32 transport_lba_32(unsigned char *cdb)
 212{
 213        return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
 214}
 215
 216static inline unsigned long long transport_lba_64(unsigned char *cdb)
 217{
 218        unsigned int __v1, __v2;
 219
 220        __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
 221        __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
 222
 223        return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
 224}
 225
 226/*
 227 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
 228 */
 229static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
 230{
 231        unsigned int __v1, __v2;
 232
 233        __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
 234        __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
 235
 236        return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
 237}
 238
 239static int sbc_write_same_supported(struct se_device *dev,
 240                unsigned char *flags)
 241{
 242        if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
 243                pr_err("WRITE_SAME PBDATA and LBDATA"
 244                        " bits not supported for Block Discard"
 245                        " Emulation\n");
 246                return -ENOSYS;
 247        }
 248
 249        /*
 250         * Currently for the emulated case we only accept
 251         * tpws with the UNMAP=1 bit set.
 252         */
 253        if (!(flags[0] & 0x08)) {
 254                pr_err("WRITE_SAME w/o UNMAP bit not"
 255                        " supported for Block Discard Emulation\n");
 256                return -ENOSYS;
 257        }
 258
 259        return 0;
 260}
 261
 262static void xdreadwrite_callback(struct se_cmd *cmd)
 263{
 264        unsigned char *buf, *addr;
 265        struct scatterlist *sg;
 266        unsigned int offset;
 267        int i;
 268        int count;
 269        /*
 270         * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
 271         *
 272         * 1) read the specified logical block(s);
 273         * 2) transfer logical blocks from the data-out buffer;
 274         * 3) XOR the logical blocks transferred from the data-out buffer with
 275         *    the logical blocks read, storing the resulting XOR data in a buffer;
 276         * 4) if the DISABLE WRITE bit is set to zero, then write the logical
 277         *    blocks transferred from the data-out buffer; and
 278         * 5) transfer the resulting XOR data to the data-in buffer.
 279         */
 280        buf = kmalloc(cmd->data_length, GFP_KERNEL);
 281        if (!buf) {
 282                pr_err("Unable to allocate xor_callback buf\n");
 283                return;
 284        }
 285        /*
 286         * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
 287         * into the locally allocated *buf
 288         */
 289        sg_copy_to_buffer(cmd->t_data_sg,
 290                          cmd->t_data_nents,
 291                          buf,
 292                          cmd->data_length);
 293
 294        /*
 295         * Now perform the XOR against the BIDI read memory located at
 296         * cmd->t_mem_bidi_list
 297         */
 298
 299        offset = 0;
 300        for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
 301                addr = kmap_atomic(sg_page(sg));
 302                if (!addr)
 303                        goto out;
 304
 305                for (i = 0; i < sg->length; i++)
 306                        *(addr + sg->offset + i) ^= *(buf + offset + i);
 307
 308                offset += sg->length;
 309                kunmap_atomic(addr);
 310        }
 311
 312out:
 313        kfree(buf);
 314}
 315
 316int sbc_parse_cdb(struct se_cmd *cmd, struct spc_ops *ops)
 317{
 318        struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
 319        struct se_device *dev = cmd->se_dev;
 320        unsigned char *cdb = cmd->t_task_cdb;
 321        unsigned int size;
 322        u32 sectors = 0;
 323        int ret;
 324
 325        switch (cdb[0]) {
 326        case READ_6:
 327                sectors = transport_get_sectors_6(cdb);
 328                cmd->t_task_lba = transport_lba_21(cdb);
 329                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 330                cmd->execute_cmd = ops->execute_rw;
 331                break;
 332        case READ_10:
 333                sectors = transport_get_sectors_10(cdb);
 334                cmd->t_task_lba = transport_lba_32(cdb);
 335                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 336                cmd->execute_cmd = ops->execute_rw;
 337                break;
 338        case READ_12:
 339                sectors = transport_get_sectors_12(cdb);
 340                cmd->t_task_lba = transport_lba_32(cdb);
 341                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 342                cmd->execute_cmd = ops->execute_rw;
 343                break;
 344        case READ_16:
 345                sectors = transport_get_sectors_16(cdb);
 346                cmd->t_task_lba = transport_lba_64(cdb);
 347                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 348                cmd->execute_cmd = ops->execute_rw;
 349                break;
 350        case WRITE_6:
 351                sectors = transport_get_sectors_6(cdb);
 352                cmd->t_task_lba = transport_lba_21(cdb);
 353                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 354                cmd->execute_cmd = ops->execute_rw;
 355                break;
 356        case WRITE_10:
 357        case WRITE_VERIFY:
 358                sectors = transport_get_sectors_10(cdb);
 359                cmd->t_task_lba = transport_lba_32(cdb);
 360                if (cdb[1] & 0x8)
 361                        cmd->se_cmd_flags |= SCF_FUA;
 362                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 363                cmd->execute_cmd = ops->execute_rw;
 364                break;
 365        case WRITE_12:
 366                sectors = transport_get_sectors_12(cdb);
 367                cmd->t_task_lba = transport_lba_32(cdb);
 368                if (cdb[1] & 0x8)
 369                        cmd->se_cmd_flags |= SCF_FUA;
 370                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 371                cmd->execute_cmd = ops->execute_rw;
 372                break;
 373        case WRITE_16:
 374                sectors = transport_get_sectors_16(cdb);
 375                cmd->t_task_lba = transport_lba_64(cdb);
 376                if (cdb[1] & 0x8)
 377                        cmd->se_cmd_flags |= SCF_FUA;
 378                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 379                cmd->execute_cmd = ops->execute_rw;
 380                break;
 381        case XDWRITEREAD_10:
 382                if ((cmd->data_direction != DMA_TO_DEVICE) ||
 383                    !(cmd->se_cmd_flags & SCF_BIDI))
 384                        goto out_invalid_cdb_field;
 385                sectors = transport_get_sectors_10(cdb);
 386
 387                cmd->t_task_lba = transport_lba_32(cdb);
 388                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 389
 390                /*
 391                 * Setup BIDI XOR callback to be run after I/O completion.
 392                 */
 393                cmd->execute_cmd = ops->execute_rw;
 394                cmd->transport_complete_callback = &xdreadwrite_callback;
 395                if (cdb[1] & 0x8)
 396                        cmd->se_cmd_flags |= SCF_FUA;
 397                break;
 398        case VARIABLE_LENGTH_CMD:
 399        {
 400                u16 service_action = get_unaligned_be16(&cdb[8]);
 401                switch (service_action) {
 402                case XDWRITEREAD_32:
 403                        sectors = transport_get_sectors_32(cdb);
 404
 405                        /*
 406                         * Use WRITE_32 and READ_32 opcodes for the emulated
 407                         * XDWRITE_READ_32 logic.
 408                         */
 409                        cmd->t_task_lba = transport_lba_64_ext(cdb);
 410                        cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 411
 412                        /*
 413                         * Setup BIDI XOR callback to be run during after I/O
 414                         * completion.
 415                         */
 416                        cmd->execute_cmd = ops->execute_rw;
 417                        cmd->transport_complete_callback = &xdreadwrite_callback;
 418                        if (cdb[1] & 0x8)
 419                                cmd->se_cmd_flags |= SCF_FUA;
 420                        break;
 421                case WRITE_SAME_32:
 422                        if (!ops->execute_write_same)
 423                                goto out_unsupported_cdb;
 424
 425                        sectors = transport_get_sectors_32(cdb);
 426                        if (!sectors) {
 427                                pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
 428                                       " supported\n");
 429                                goto out_invalid_cdb_field;
 430                        }
 431
 432                        size = sbc_get_size(cmd, 1);
 433                        cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
 434
 435                        if (sbc_write_same_supported(dev, &cdb[10]) < 0)
 436                                goto out_unsupported_cdb;
 437                        cmd->execute_cmd = ops->execute_write_same;
 438                        break;
 439                default:
 440                        pr_err("VARIABLE_LENGTH_CMD service action"
 441                                " 0x%04x not supported\n", service_action);
 442                        goto out_unsupported_cdb;
 443                }
 444                break;
 445        }
 446        case READ_CAPACITY:
 447                size = READ_CAP_LEN;
 448                cmd->execute_cmd = sbc_emulate_readcapacity;
 449                break;
 450        case SERVICE_ACTION_IN:
 451                switch (cmd->t_task_cdb[1] & 0x1f) {
 452                case SAI_READ_CAPACITY_16:
 453                        cmd->execute_cmd = sbc_emulate_readcapacity_16;
 454                        break;
 455                default:
 456                        pr_err("Unsupported SA: 0x%02x\n",
 457                                cmd->t_task_cdb[1] & 0x1f);
 458                        goto out_invalid_cdb_field;
 459                }
 460                size = (cdb[10] << 24) | (cdb[11] << 16) |
 461                       (cdb[12] << 8) | cdb[13];
 462                break;
 463        case SYNCHRONIZE_CACHE:
 464        case SYNCHRONIZE_CACHE_16:
 465                if (!ops->execute_sync_cache)
 466                        goto out_unsupported_cdb;
 467
 468                /*
 469                 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
 470                 */
 471                if (cdb[0] == SYNCHRONIZE_CACHE) {
 472                        sectors = transport_get_sectors_10(cdb);
 473                        cmd->t_task_lba = transport_lba_32(cdb);
 474                } else {
 475                        sectors = transport_get_sectors_16(cdb);
 476                        cmd->t_task_lba = transport_lba_64(cdb);
 477                }
 478
 479                size = sbc_get_size(cmd, sectors);
 480
 481                /*
 482                 * Check to ensure that LBA + Range does not exceed past end of
 483                 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
 484                 */
 485                if (cmd->t_task_lba || sectors) {
 486                        if (sbc_check_valid_sectors(cmd) < 0)
 487                                goto out_invalid_cdb_field;
 488                }
 489                cmd->execute_cmd = ops->execute_sync_cache;
 490                break;
 491        case UNMAP:
 492                if (!ops->execute_unmap)
 493                        goto out_unsupported_cdb;
 494
 495                size = get_unaligned_be16(&cdb[7]);
 496                cmd->execute_cmd = ops->execute_unmap;
 497                break;
 498        case WRITE_SAME_16:
 499                if (!ops->execute_write_same)
 500                        goto out_unsupported_cdb;
 501
 502                sectors = transport_get_sectors_16(cdb);
 503                if (!sectors) {
 504                        pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
 505                        goto out_invalid_cdb_field;
 506                }
 507
 508                size = sbc_get_size(cmd, 1);
 509                cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
 510
 511                if (sbc_write_same_supported(dev, &cdb[1]) < 0)
 512                        goto out_unsupported_cdb;
 513                cmd->execute_cmd = ops->execute_write_same;
 514                break;
 515        case WRITE_SAME:
 516                if (!ops->execute_write_same)
 517                        goto out_unsupported_cdb;
 518
 519                sectors = transport_get_sectors_10(cdb);
 520                if (!sectors) {
 521                        pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
 522                        goto out_invalid_cdb_field;
 523                }
 524
 525                size = sbc_get_size(cmd, 1);
 526                cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
 527
 528                /*
 529                 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
 530                 * of byte 1 bit 3 UNMAP instead of original reserved field
 531                 */
 532                if (sbc_write_same_supported(dev, &cdb[1]) < 0)
 533                        goto out_unsupported_cdb;
 534                cmd->execute_cmd = ops->execute_write_same;
 535                break;
 536        case VERIFY:
 537                size = 0;
 538                cmd->execute_cmd = sbc_emulate_verify;
 539                break;
 540        case REZERO_UNIT:
 541        case SEEK_6:
 542        case SEEK_10:
 543                /*
 544                 * There are still clients out there which use these old SCSI-2
 545                 * commands. This mainly happens when running VMs with legacy
 546                 * guest systems, connected via SCSI command pass-through to
 547                 * iSCSI targets. Make them happy and return status GOOD.
 548                 */
 549                size = 0;
 550                cmd->execute_cmd = sbc_emulate_noop;
 551                break;
 552        default:
 553                ret = spc_parse_cdb(cmd, &size);
 554                if (ret)
 555                        return ret;
 556        }
 557
 558        /* reject any command that we don't have a handler for */
 559        if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
 560                goto out_unsupported_cdb;
 561
 562        if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
 563                unsigned long long end_lba;
 564
 565                if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
 566                        printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
 567                                " big sectors %u exceeds fabric_max_sectors:"
 568                                " %u\n", cdb[0], sectors,
 569                                su_dev->se_dev_attrib.fabric_max_sectors);
 570                        goto out_invalid_cdb_field;
 571                }
 572                if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
 573                        printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
 574                                " big sectors %u exceeds backend hw_max_sectors:"
 575                                " %u\n", cdb[0], sectors,
 576                                su_dev->se_dev_attrib.hw_max_sectors);
 577                        goto out_invalid_cdb_field;
 578                }
 579
 580                end_lba = dev->transport->get_blocks(dev) + 1;
 581                if (cmd->t_task_lba + sectors > end_lba) {
 582                        pr_err("cmd exceeds last lba %llu "
 583                                "(lba %llu, sectors %u)\n",
 584                                end_lba, cmd->t_task_lba, sectors);
 585                        goto out_invalid_cdb_field;
 586                }
 587
 588                size = sbc_get_size(cmd, sectors);
 589        }
 590
 591        ret = target_cmd_size_check(cmd, size);
 592        if (ret < 0)
 593                return ret;
 594
 595        return 0;
 596
 597out_unsupported_cdb:
 598        cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 599        cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
 600        return -EINVAL;
 601out_invalid_cdb_field:
 602        cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 603        cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
 604        return -EINVAL;
 605}
 606EXPORT_SYMBOL(sbc_parse_cdb);
 607
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