linux/drivers/target/target_core_rd.c
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   1/*******************************************************************************
   2 * Filename:  target_core_rd.c
   3 *
   4 * This file contains the Storage Engine <-> Ramdisk transport
   5 * specific functions.
   6 *
   7 * (c) Copyright 2003-2013 Datera, Inc.
   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
  27#include <linux/string.h>
  28#include <linux/parser.h>
  29#include <linux/highmem.h>
  30#include <linux/timer.h>
  31#include <linux/scatterlist.h>
  32#include <linux/slab.h>
  33#include <linux/spinlock.h>
  34#include <scsi/scsi_proto.h>
  35
  36#include <target/target_core_base.h>
  37#include <target/target_core_backend.h>
  38
  39#include "target_core_rd.h"
  40
  41static inline struct rd_dev *RD_DEV(struct se_device *dev)
  42{
  43        return container_of(dev, struct rd_dev, dev);
  44}
  45
  46static int rd_attach_hba(struct se_hba *hba, u32 host_id)
  47{
  48        struct rd_host *rd_host;
  49
  50        rd_host = kzalloc(sizeof(*rd_host), GFP_KERNEL);
  51        if (!rd_host)
  52                return -ENOMEM;
  53
  54        rd_host->rd_host_id = host_id;
  55
  56        hba->hba_ptr = rd_host;
  57
  58        pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on"
  59                " Generic Target Core Stack %s\n", hba->hba_id,
  60                RD_HBA_VERSION, TARGET_CORE_VERSION);
  61
  62        return 0;
  63}
  64
  65static void rd_detach_hba(struct se_hba *hba)
  66{
  67        struct rd_host *rd_host = hba->hba_ptr;
  68
  69        pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from"
  70                " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id);
  71
  72        kfree(rd_host);
  73        hba->hba_ptr = NULL;
  74}
  75
  76static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table,
  77                                 u32 sg_table_count)
  78{
  79        struct page *pg;
  80        struct scatterlist *sg;
  81        u32 i, j, page_count = 0, sg_per_table;
  82
  83        for (i = 0; i < sg_table_count; i++) {
  84                sg = sg_table[i].sg_table;
  85                sg_per_table = sg_table[i].rd_sg_count;
  86
  87                for (j = 0; j < sg_per_table; j++) {
  88                        pg = sg_page(&sg[j]);
  89                        if (pg) {
  90                                __free_page(pg);
  91                                page_count++;
  92                        }
  93                }
  94                kfree(sg);
  95        }
  96
  97        kfree(sg_table);
  98        return page_count;
  99}
 100
 101static void rd_release_device_space(struct rd_dev *rd_dev)
 102{
 103        u32 page_count;
 104
 105        if (!rd_dev->sg_table_array || !rd_dev->sg_table_count)
 106                return;
 107
 108        page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array,
 109                                          rd_dev->sg_table_count);
 110
 111        pr_debug("CORE_RD[%u] - Released device space for Ramdisk"
 112                " Device ID: %u, pages %u in %u tables total bytes %lu\n",
 113                rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count,
 114                rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE);
 115
 116        rd_dev->sg_table_array = NULL;
 117        rd_dev->sg_table_count = 0;
 118}
 119
 120
 121/*      rd_build_device_space():
 122 *
 123 *
 124 */
 125static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table,
 126                                 u32 total_sg_needed, unsigned char init_payload)
 127{
 128        u32 i = 0, j, page_offset = 0, sg_per_table;
 129        u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
 130                                sizeof(struct scatterlist));
 131        struct page *pg;
 132        struct scatterlist *sg;
 133        unsigned char *p;
 134
 135        while (total_sg_needed) {
 136                unsigned int chain_entry = 0;
 137
 138                sg_per_table = (total_sg_needed > max_sg_per_table) ?
 139                        max_sg_per_table : total_sg_needed;
 140
 141                /*
 142                 * Reserve extra element for chain entry
 143                 */
 144                if (sg_per_table < total_sg_needed)
 145                        chain_entry = 1;
 146
 147                sg = kmalloc_array(sg_per_table + chain_entry, sizeof(*sg),
 148                                GFP_KERNEL);
 149                if (!sg)
 150                        return -ENOMEM;
 151
 152                sg_init_table(sg, sg_per_table + chain_entry);
 153
 154                if (i > 0) {
 155                        sg_chain(sg_table[i - 1].sg_table,
 156                                 max_sg_per_table + 1, sg);
 157                }
 158
 159                sg_table[i].sg_table = sg;
 160                sg_table[i].rd_sg_count = sg_per_table;
 161                sg_table[i].page_start_offset = page_offset;
 162                sg_table[i++].page_end_offset = (page_offset + sg_per_table)
 163                                                - 1;
 164
 165                for (j = 0; j < sg_per_table; j++) {
 166                        pg = alloc_pages(GFP_KERNEL, 0);
 167                        if (!pg) {
 168                                pr_err("Unable to allocate scatterlist"
 169                                        " pages for struct rd_dev_sg_table\n");
 170                                return -ENOMEM;
 171                        }
 172                        sg_assign_page(&sg[j], pg);
 173                        sg[j].length = PAGE_SIZE;
 174
 175                        p = kmap(pg);
 176                        memset(p, init_payload, PAGE_SIZE);
 177                        kunmap(pg);
 178                }
 179
 180                page_offset += sg_per_table;
 181                total_sg_needed -= sg_per_table;
 182        }
 183
 184        return 0;
 185}
 186
 187static int rd_build_device_space(struct rd_dev *rd_dev)
 188{
 189        struct rd_dev_sg_table *sg_table;
 190        u32 sg_tables, total_sg_needed;
 191        u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
 192                                sizeof(struct scatterlist));
 193        int rc;
 194
 195        if (rd_dev->rd_page_count <= 0) {
 196                pr_err("Illegal page count: %u for Ramdisk device\n",
 197                       rd_dev->rd_page_count);
 198                return -EINVAL;
 199        }
 200
 201        /* Don't need backing pages for NULLIO */
 202        if (rd_dev->rd_flags & RDF_NULLIO)
 203                return 0;
 204
 205        total_sg_needed = rd_dev->rd_page_count;
 206
 207        sg_tables = (total_sg_needed / max_sg_per_table) + 1;
 208        sg_table = kcalloc(sg_tables, sizeof(*sg_table), GFP_KERNEL);
 209        if (!sg_table)
 210                return -ENOMEM;
 211
 212        rd_dev->sg_table_array = sg_table;
 213        rd_dev->sg_table_count = sg_tables;
 214
 215        rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00);
 216        if (rc)
 217                return rc;
 218
 219        pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of"
 220                 " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
 221                 rd_dev->rd_dev_id, rd_dev->rd_page_count,
 222                 rd_dev->sg_table_count);
 223
 224        return 0;
 225}
 226
 227static void rd_release_prot_space(struct rd_dev *rd_dev)
 228{
 229        u32 page_count;
 230
 231        if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count)
 232                return;
 233
 234        page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array,
 235                                          rd_dev->sg_prot_count);
 236
 237        pr_debug("CORE_RD[%u] - Released protection space for Ramdisk"
 238                 " Device ID: %u, pages %u in %u tables total bytes %lu\n",
 239                 rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count,
 240                 rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE);
 241
 242        rd_dev->sg_prot_array = NULL;
 243        rd_dev->sg_prot_count = 0;
 244}
 245
 246static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size)
 247{
 248        struct rd_dev_sg_table *sg_table;
 249        u32 total_sg_needed, sg_tables;
 250        u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
 251                                sizeof(struct scatterlist));
 252        int rc;
 253
 254        if (rd_dev->rd_flags & RDF_NULLIO)
 255                return 0;
 256        /*
 257         * prot_length=8byte dif data
 258         * tot sg needed = rd_page_count * (PGSZ/block_size) *
 259         *                 (prot_length/block_size) + pad
 260         * PGSZ canceled each other.
 261         */
 262        total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1;
 263
 264        sg_tables = (total_sg_needed / max_sg_per_table) + 1;
 265        sg_table = kcalloc(sg_tables, sizeof(*sg_table), GFP_KERNEL);
 266        if (!sg_table)
 267                return -ENOMEM;
 268
 269        rd_dev->sg_prot_array = sg_table;
 270        rd_dev->sg_prot_count = sg_tables;
 271
 272        rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff);
 273        if (rc)
 274                return rc;
 275
 276        pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of"
 277                 " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
 278                 rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count);
 279
 280        return 0;
 281}
 282
 283static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name)
 284{
 285        struct rd_dev *rd_dev;
 286        struct rd_host *rd_host = hba->hba_ptr;
 287
 288        rd_dev = kzalloc(sizeof(*rd_dev), GFP_KERNEL);
 289        if (!rd_dev)
 290                return NULL;
 291
 292        rd_dev->rd_host = rd_host;
 293
 294        return &rd_dev->dev;
 295}
 296
 297static int rd_configure_device(struct se_device *dev)
 298{
 299        struct rd_dev *rd_dev = RD_DEV(dev);
 300        struct rd_host *rd_host = dev->se_hba->hba_ptr;
 301        int ret;
 302
 303        if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) {
 304                pr_debug("Missing rd_pages= parameter\n");
 305                return -EINVAL;
 306        }
 307
 308        ret = rd_build_device_space(rd_dev);
 309        if (ret < 0)
 310                goto fail;
 311
 312        dev->dev_attrib.hw_block_size = RD_BLOCKSIZE;
 313        dev->dev_attrib.hw_max_sectors = UINT_MAX;
 314        dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH;
 315        dev->dev_attrib.is_nonrot = 1;
 316
 317        rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++;
 318
 319        pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of"
 320                " %u pages in %u tables, %lu total bytes\n",
 321                rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count,
 322                rd_dev->sg_table_count,
 323                (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE));
 324
 325        return 0;
 326
 327fail:
 328        rd_release_device_space(rd_dev);
 329        return ret;
 330}
 331
 332static void rd_dev_call_rcu(struct rcu_head *p)
 333{
 334        struct se_device *dev = container_of(p, struct se_device, rcu_head);
 335        struct rd_dev *rd_dev = RD_DEV(dev);
 336
 337        kfree(rd_dev);
 338}
 339
 340static void rd_free_device(struct se_device *dev)
 341{
 342        call_rcu(&dev->rcu_head, rd_dev_call_rcu);
 343}
 344
 345static void rd_destroy_device(struct se_device *dev)
 346{
 347        struct rd_dev *rd_dev = RD_DEV(dev);
 348
 349        rd_release_device_space(rd_dev);
 350}
 351
 352static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page)
 353{
 354        struct rd_dev_sg_table *sg_table;
 355        u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE /
 356                                sizeof(struct scatterlist));
 357
 358        i = page / sg_per_table;
 359        if (i < rd_dev->sg_table_count) {
 360                sg_table = &rd_dev->sg_table_array[i];
 361                if ((sg_table->page_start_offset <= page) &&
 362                    (sg_table->page_end_offset >= page))
 363                        return sg_table;
 364        }
 365
 366        pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n",
 367                        page);
 368
 369        return NULL;
 370}
 371
 372static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page)
 373{
 374        struct rd_dev_sg_table *sg_table;
 375        u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE /
 376                                sizeof(struct scatterlist));
 377
 378        i = page / sg_per_table;
 379        if (i < rd_dev->sg_prot_count) {
 380                sg_table = &rd_dev->sg_prot_array[i];
 381                if ((sg_table->page_start_offset <= page) &&
 382                     (sg_table->page_end_offset >= page))
 383                        return sg_table;
 384        }
 385
 386        pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n",
 387                        page);
 388
 389        return NULL;
 390}
 391
 392static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read)
 393{
 394        struct se_device *se_dev = cmd->se_dev;
 395        struct rd_dev *dev = RD_DEV(se_dev);
 396        struct rd_dev_sg_table *prot_table;
 397        struct scatterlist *prot_sg;
 398        u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size;
 399        u32 prot_offset, prot_page;
 400        u32 prot_npages __maybe_unused;
 401        u64 tmp;
 402        sense_reason_t rc = 0;
 403
 404        tmp = cmd->t_task_lba * se_dev->prot_length;
 405        prot_offset = do_div(tmp, PAGE_SIZE);
 406        prot_page = tmp;
 407
 408        prot_table = rd_get_prot_table(dev, prot_page);
 409        if (!prot_table)
 410                return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 411
 412        prot_sg = &prot_table->sg_table[prot_page -
 413                                        prot_table->page_start_offset];
 414
 415        if (se_dev->dev_attrib.pi_prot_verify) {
 416                if (is_read)
 417                        rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
 418                                            prot_sg, prot_offset);
 419                else
 420                        rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
 421                                            cmd->t_prot_sg, 0);
 422        }
 423        if (!rc)
 424                sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset);
 425
 426        return rc;
 427}
 428
 429static sense_reason_t
 430rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 431              enum dma_data_direction data_direction)
 432{
 433        struct se_device *se_dev = cmd->se_dev;
 434        struct rd_dev *dev = RD_DEV(se_dev);
 435        struct rd_dev_sg_table *table;
 436        struct scatterlist *rd_sg;
 437        struct sg_mapping_iter m;
 438        u32 rd_offset;
 439        u32 rd_size;
 440        u32 rd_page;
 441        u32 src_len;
 442        u64 tmp;
 443        sense_reason_t rc;
 444
 445        if (dev->rd_flags & RDF_NULLIO) {
 446                target_complete_cmd(cmd, SAM_STAT_GOOD);
 447                return 0;
 448        }
 449
 450        tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size;
 451        rd_offset = do_div(tmp, PAGE_SIZE);
 452        rd_page = tmp;
 453        rd_size = cmd->data_length;
 454
 455        table = rd_get_sg_table(dev, rd_page);
 456        if (!table)
 457                return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 458
 459        rd_sg = &table->sg_table[rd_page - table->page_start_offset];
 460
 461        pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n",
 462                        dev->rd_dev_id,
 463                        data_direction == DMA_FROM_DEVICE ? "Read" : "Write",
 464                        cmd->t_task_lba, rd_size, rd_page, rd_offset);
 465
 466        if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type &&
 467            data_direction == DMA_TO_DEVICE) {
 468                rc = rd_do_prot_rw(cmd, false);
 469                if (rc)
 470                        return rc;
 471        }
 472
 473        src_len = PAGE_SIZE - rd_offset;
 474        sg_miter_start(&m, sgl, sgl_nents,
 475                        data_direction == DMA_FROM_DEVICE ?
 476                                SG_MITER_TO_SG : SG_MITER_FROM_SG);
 477        while (rd_size) {
 478                u32 len;
 479                void *rd_addr;
 480
 481                sg_miter_next(&m);
 482                if (!(u32)m.length) {
 483                        pr_debug("RD[%u]: invalid sgl %p len %zu\n",
 484                                 dev->rd_dev_id, m.addr, m.length);
 485                        sg_miter_stop(&m);
 486                        return TCM_INCORRECT_AMOUNT_OF_DATA;
 487                }
 488                len = min((u32)m.length, src_len);
 489                if (len > rd_size) {
 490                        pr_debug("RD[%u]: size underrun page %d offset %d "
 491                                 "size %d\n", dev->rd_dev_id,
 492                                 rd_page, rd_offset, rd_size);
 493                        len = rd_size;
 494                }
 495                m.consumed = len;
 496
 497                rd_addr = sg_virt(rd_sg) + rd_offset;
 498
 499                if (data_direction == DMA_FROM_DEVICE)
 500                        memcpy(m.addr, rd_addr, len);
 501                else
 502                        memcpy(rd_addr, m.addr, len);
 503
 504                rd_size -= len;
 505                if (!rd_size)
 506                        continue;
 507
 508                src_len -= len;
 509                if (src_len) {
 510                        rd_offset += len;
 511                        continue;
 512                }
 513
 514                /* rd page completed, next one please */
 515                rd_page++;
 516                rd_offset = 0;
 517                src_len = PAGE_SIZE;
 518                if (rd_page <= table->page_end_offset) {
 519                        rd_sg++;
 520                        continue;
 521                }
 522
 523                table = rd_get_sg_table(dev, rd_page);
 524                if (!table) {
 525                        sg_miter_stop(&m);
 526                        return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 527                }
 528
 529                /* since we increment, the first sg entry is correct */
 530                rd_sg = table->sg_table;
 531        }
 532        sg_miter_stop(&m);
 533
 534        if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type &&
 535            data_direction == DMA_FROM_DEVICE) {
 536                rc = rd_do_prot_rw(cmd, true);
 537                if (rc)
 538                        return rc;
 539        }
 540
 541        target_complete_cmd(cmd, SAM_STAT_GOOD);
 542        return 0;
 543}
 544
 545enum {
 546        Opt_rd_pages, Opt_rd_nullio, Opt_err
 547};
 548
 549static match_table_t tokens = {
 550        {Opt_rd_pages, "rd_pages=%d"},
 551        {Opt_rd_nullio, "rd_nullio=%d"},
 552        {Opt_err, NULL}
 553};
 554
 555static ssize_t rd_set_configfs_dev_params(struct se_device *dev,
 556                const char *page, ssize_t count)
 557{
 558        struct rd_dev *rd_dev = RD_DEV(dev);
 559        char *orig, *ptr, *opts;
 560        substring_t args[MAX_OPT_ARGS];
 561        int arg, token;
 562
 563        opts = kstrdup(page, GFP_KERNEL);
 564        if (!opts)
 565                return -ENOMEM;
 566
 567        orig = opts;
 568
 569        while ((ptr = strsep(&opts, ",\n")) != NULL) {
 570                if (!*ptr)
 571                        continue;
 572
 573                token = match_token(ptr, tokens, args);
 574                switch (token) {
 575                case Opt_rd_pages:
 576                        match_int(args, &arg);
 577                        rd_dev->rd_page_count = arg;
 578                        pr_debug("RAMDISK: Referencing Page"
 579                                " Count: %u\n", rd_dev->rd_page_count);
 580                        rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT;
 581                        break;
 582                case Opt_rd_nullio:
 583                        match_int(args, &arg);
 584                        if (arg != 1)
 585                                break;
 586
 587                        pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg);
 588                        rd_dev->rd_flags |= RDF_NULLIO;
 589                        break;
 590                default:
 591                        break;
 592                }
 593        }
 594
 595        kfree(orig);
 596        return count;
 597}
 598
 599static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b)
 600{
 601        struct rd_dev *rd_dev = RD_DEV(dev);
 602
 603        ssize_t bl = sprintf(b, "TCM RamDisk ID: %u  RamDisk Makeup: rd_mcp\n",
 604                        rd_dev->rd_dev_id);
 605        bl += sprintf(b + bl, "        PAGES/PAGE_SIZE: %u*%lu"
 606                        "  SG_table_count: %u  nullio: %d\n", rd_dev->rd_page_count,
 607                        PAGE_SIZE, rd_dev->sg_table_count,
 608                        !!(rd_dev->rd_flags & RDF_NULLIO));
 609        return bl;
 610}
 611
 612static sector_t rd_get_blocks(struct se_device *dev)
 613{
 614        struct rd_dev *rd_dev = RD_DEV(dev);
 615
 616        unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) /
 617                        dev->dev_attrib.block_size) - 1;
 618
 619        return blocks_long;
 620}
 621
 622static int rd_init_prot(struct se_device *dev)
 623{
 624        struct rd_dev *rd_dev = RD_DEV(dev);
 625
 626        if (!dev->dev_attrib.pi_prot_type)
 627                return 0;
 628
 629        return rd_build_prot_space(rd_dev, dev->prot_length,
 630                                   dev->dev_attrib.block_size);
 631}
 632
 633static void rd_free_prot(struct se_device *dev)
 634{
 635        struct rd_dev *rd_dev = RD_DEV(dev);
 636
 637        rd_release_prot_space(rd_dev);
 638}
 639
 640static struct sbc_ops rd_sbc_ops = {
 641        .execute_rw             = rd_execute_rw,
 642};
 643
 644static sense_reason_t
 645rd_parse_cdb(struct se_cmd *cmd)
 646{
 647        return sbc_parse_cdb(cmd, &rd_sbc_ops);
 648}
 649
 650static const struct target_backend_ops rd_mcp_ops = {
 651        .name                   = "rd_mcp",
 652        .inquiry_prod           = "RAMDISK-MCP",
 653        .inquiry_rev            = RD_MCP_VERSION,
 654        .attach_hba             = rd_attach_hba,
 655        .detach_hba             = rd_detach_hba,
 656        .alloc_device           = rd_alloc_device,
 657        .configure_device       = rd_configure_device,
 658        .destroy_device         = rd_destroy_device,
 659        .free_device            = rd_free_device,
 660        .parse_cdb              = rd_parse_cdb,
 661        .set_configfs_dev_params = rd_set_configfs_dev_params,
 662        .show_configfs_dev_params = rd_show_configfs_dev_params,
 663        .get_device_type        = sbc_get_device_type,
 664        .get_blocks             = rd_get_blocks,
 665        .init_prot              = rd_init_prot,
 666        .free_prot              = rd_free_prot,
 667        .tb_dev_attrib_attrs    = sbc_attrib_attrs,
 668};
 669
 670int __init rd_module_init(void)
 671{
 672        return transport_backend_register(&rd_mcp_ops);
 673}
 674
 675void rd_module_exit(void)
 676{
 677        target_backend_unregister(&rd_mcp_ops);
 678}
 679