drivers/target/target_core_file.c

   1 /*******************************************************************************
   2  * Filename:  target_core_file.c
   3  *
   4  * This file contains the Storage Engine <-> FILEIO transport specific functions
   5  *
   6  * Copyright (c) 2005 PyX Technologies, Inc.
   7  * Copyright (c) 2005-2006 SBE, Inc.  All Rights Reserved.
   8  * Copyright (c) 2007-2010 Rising Tide Systems
   9  * Copyright (c) 2008-2010 Linux-iSCSI.org
  10  *
  11  * Nicholas A. Bellinger <nab@kernel.org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  *
  27  ******************************************************************************/
  28
  29 #include <linux/string.h>
  30 #include <linux/parser.h>
  31 #include <linux/timer.h>
  32 #include <linux/blkdev.h>
  33 #include <linux/slab.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/module.h>
  36 #include <scsi/scsi.h>
  37 #include <scsi/scsi_host.h>
  38
  39 #include <target/target_core_base.h>
  40 #include <target/target_core_backend.h>
  41
  42 #include "target_core_file.h"
  43
  44 static struct se_subsystem_api fileio_template;
  45
  46 /*      fd_attach_hba(): (Part of se_subsystem_api_t template)
  47  *
  48  *
  49  */
  50 static int fd_attach_hba(struct se_hba *hba, u32 host_id)
  51 {
  52         struct fd_host *fd_host;
  53
  54         fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL);
  55         if (!fd_host) {
  56                 pr_err("Unable to allocate memory for struct fd_host\n");
  57                 return -ENOMEM;
  58         }
  59
  60         fd_host->fd_host_id = host_id;
  61
  62         hba->hba_ptr = fd_host;
  63
  64         pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic"
  65                 " Target Core Stack %s\n", hba->hba_id, FD_VERSION,
  66                 TARGET_CORE_MOD_VERSION);
  67         pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic"
  68                 " MaxSectors: %u\n",
  69                 hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS);
  70
  71         return 0;
  72 }
  73
  74 static void fd_detach_hba(struct se_hba *hba)
  75 {
  76         struct fd_host *fd_host = hba->hba_ptr;
  77
  78         pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic"
  79                 " Target Core\n", hba->hba_id, fd_host->fd_host_id);
  80
  81         kfree(fd_host);
  82         hba->hba_ptr = NULL;
  83 }
  84
  85 static void *fd_allocate_virtdevice(struct se_hba *hba, const char *name)
  86 {
  87         struct fd_dev *fd_dev;
  88         struct fd_host *fd_host = hba->hba_ptr;
  89
  90         fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL);
  91         if (!fd_dev) {
  92                 pr_err("Unable to allocate memory for struct fd_dev\n");
  93                 return NULL;
  94         }
  95
  96         fd_dev->fd_host = fd_host;
  97
  98         pr_debug("FILEIO: Allocated fd_dev for %p\n", name);
  99
 100         return fd_dev;
 101 }
 102
 103 /*      fd_create_virtdevice(): (Part of se_subsystem_api_t template)
 104  *
 105  *
 106  */
 107 static struct se_device *fd_create_virtdevice(
 108         struct se_hba *hba,
 109         struct se_subsystem_dev *se_dev,
 110         void *p)
 111 {
 112         char *dev_p = NULL;
 113         struct se_device *dev;
 114         struct se_dev_limits dev_limits;
 115         struct queue_limits *limits;
 116         struct fd_dev *fd_dev = p;
 117         struct fd_host *fd_host = hba->hba_ptr;
 118         mm_segment_t old_fs;
 119         struct file *file;
 120         struct inode *inode = NULL;
 121         int dev_flags = 0, flags, ret = -EINVAL;
 122
 123         memset(&dev_limits, 0, sizeof(struct se_dev_limits));
 124
 125         old_fs = get_fs();
 126         set_fs(get_ds());
 127         dev_p = getname(fd_dev->fd_dev_name);
 128         set_fs(old_fs);
 129
 130         if (IS_ERR(dev_p)) {
 131                 pr_err("getname(%s) failed: %lu\n",
 132                         fd_dev->fd_dev_name, IS_ERR(dev_p));
 133                 ret = PTR_ERR(dev_p);
 134                 goto fail;
 135         }
 136 #if 0
 137         if (di->no_create_file)
 138                 flags = O_RDWR | O_LARGEFILE;
 139         else
 140                 flags = O_RDWR | O_CREAT | O_LARGEFILE;
 141 #else
 142         flags = O_RDWR | O_CREAT | O_LARGEFILE;
 143 #endif
 144 /*      flags |= O_DIRECT; */
 145         /*
 146          * If fd_buffered_io=1 has not been set explicitly (the default),
 147          * use O_SYNC to force FILEIO writes to disk.
 148          */
 149         if (!(fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO))
 150                 flags |= O_SYNC;
 151
 152         file = filp_open(dev_p, flags, 0600);
 153         if (IS_ERR(file)) {
 154                 pr_err("filp_open(%s) failed\n", dev_p);
 155                 ret = PTR_ERR(file);
 156                 goto fail;
 157         }
 158         if (!file || !file->f_dentry) {
 159                 pr_err("filp_open(%s) failed\n", dev_p);
 160                 goto fail;
 161         }
 162         fd_dev->fd_file = file;
 163         /*
 164          * If using a block backend with this struct file, we extract
 165          * fd_dev->fd_[block,dev]_size from struct block_device.
 166          *
 167          * Otherwise, we use the passed fd_size= from configfs
 168          */
 169         inode = file->f_mapping->host;
 170         if (S_ISBLK(inode->i_mode)) {
 171                 struct request_queue *q;
 172                 unsigned long long dev_size;
 173                 /*
 174                  * Setup the local scope queue_limits from struct request_queue->limits
 175                  * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
 176                  */
 177                 q = bdev_get_queue(inode->i_bdev);
 178                 limits = &dev_limits.limits;
 179                 limits->logical_block_size = bdev_logical_block_size(inode->i_bdev);
 180                 limits->max_hw_sectors = queue_max_hw_sectors(q);
 181                 limits->max_sectors = queue_max_sectors(q);
 182                 /*
 183                  * Determine the number of bytes from i_size_read() minus
 184                  * one (1) logical sector from underlying struct block_device
 185                  */
 186                 fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
 187                 dev_size = (i_size_read(file->f_mapping->host) -
 188                                        fd_dev->fd_block_size);
 189
 190                 pr_debug("FILEIO: Using size: %llu bytes from struct"
 191                         " block_device blocks: %llu logical_block_size: %d\n",
 192                         dev_size, div_u64(dev_size, fd_dev->fd_block_size),
 193                         fd_dev->fd_block_size);
 194         } else {
 195                 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
 196                         pr_err("FILEIO: Missing fd_dev_size="
 197                                 " parameter, and no backing struct"
 198                                 " block_device\n");
 199                         goto fail;
 200                 }
 201
 202                 limits = &dev_limits.limits;
 203                 limits->logical_block_size = FD_BLOCKSIZE;
 204                 limits->max_hw_sectors = FD_MAX_SECTORS;
 205                 limits->max_sectors = FD_MAX_SECTORS;
 206                 fd_dev->fd_block_size = FD_BLOCKSIZE;
 207         }
 208
 209         dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
 210         dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH;
 211
 212         dev = transport_add_device_to_core_hba(hba, &fileio_template,
 213                                 se_dev, dev_flags, fd_dev,
 214                                 &dev_limits, "FILEIO", FD_VERSION);
 215         if (!dev)
 216                 goto fail;
 217
 218         fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
 219         fd_dev->fd_queue_depth = dev->queue_depth;
 220
 221         pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
 222                 " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
 223                         fd_dev->fd_dev_name, fd_dev->fd_dev_size);
 224
 225         putname(dev_p);
 226         return dev;
 227 fail:
 228         if (fd_dev->fd_file) {
 229                 filp_close(fd_dev->fd_file, NULL);
 230                 fd_dev->fd_file = NULL;
 231         }
 232         putname(dev_p);
 233         return ERR_PTR(ret);
 234 }
 235
 236 /*      fd_free_device(): (Part of se_subsystem_api_t template)
 237  *
 238  *
 239  */
 240 static void fd_free_device(void *p)
 241 {
 242         struct fd_dev *fd_dev = p;
 243
 244         if (fd_dev->fd_file) {
 245                 filp_close(fd_dev->fd_file, NULL);
 246                 fd_dev->fd_file = NULL;
 247         }
 248
 249         kfree(fd_dev);
 250 }
 251
 252 static inline struct fd_request *FILE_REQ(struct se_task *task)
 253 {
 254         return container_of(task, struct fd_request, fd_task);
 255 }
 256
 257
 258 static struct se_task *
 259 fd_alloc_task(unsigned char *cdb)
 260 {
 261         struct fd_request *fd_req;
 262
 263         fd_req = kzalloc(sizeof(struct fd_request), GFP_KERNEL);
 264         if (!fd_req) {
 265                 pr_err("Unable to allocate struct fd_request\n");
 266                 return NULL;
 267         }
 268
 269         return &fd_req->fd_task;
 270 }
 271
 272 static int fd_do_readv(struct se_task *task)
 273 {
 274         struct fd_request *req = FILE_REQ(task);
 275         struct se_device *se_dev = req->fd_task.task_se_cmd->se_dev;
 276         struct fd_dev *dev = se_dev->dev_ptr;
 277         struct file *fd = dev->fd_file;
 278         struct scatterlist *sg = task->task_sg;
 279         struct iovec *iov;
 280         mm_segment_t old_fs;
 281         loff_t pos = (task->task_lba *
 282                       se_dev->se_sub_dev->se_dev_attrib.block_size);
 283         int ret = 0, i;
 284
 285         iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL);
 286         if (!iov) {
 287                 pr_err("Unable to allocate fd_do_readv iov[]\n");
 288                 return -ENOMEM;
 289         }
 290
 291         for_each_sg(task->task_sg, sg, task->task_sg_nents, i) {
 292                 iov[i].iov_len = sg->length;
 293                 iov[i].iov_base = sg_virt(sg);
 294         }
 295
 296         old_fs = get_fs();
 297         set_fs(get_ds());
 298         ret = vfs_readv(fd, &iov[0], task->task_sg_nents, &pos);
 299         set_fs(old_fs);
 300
 301         kfree(iov);
 302         /*
 303          * Return zeros and GOOD status even if the READ did not return
 304          * the expected virt_size for struct file w/o a backing struct
 305          * block_device.
 306          */
 307         if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) {
 308                 if (ret < 0 || ret != task->task_size) {
 309                         pr_err("vfs_readv() returned %d,"
 310                                 " expecting %d for S_ISBLK\n", ret,
 311                                 (int)task->task_size);
 312                         return (ret < 0 ? ret : -EINVAL);
 313                 }
 314         } else {
 315                 if (ret < 0) {
 316                         pr_err("vfs_readv() returned %d for non"
 317                                 " S_ISBLK\n", ret);
 318                         return ret;
 319                 }
 320         }
 321
 322         return 1;
 323 }
 324
 325 static int fd_do_writev(struct se_task *task)
 326 {
 327         struct fd_request *req = FILE_REQ(task);
 328         struct se_device *se_dev = req->fd_task.task_se_cmd->se_dev;
 329         struct fd_dev *dev = se_dev->dev_ptr;
 330         struct file *fd = dev->fd_file;
 331         struct scatterlist *sg = task->task_sg;
 332         struct iovec *iov;
 333         mm_segment_t old_fs;
 334         loff_t pos = (task->task_lba *
 335                       se_dev->se_sub_dev->se_dev_attrib.block_size);
 336         int ret, i = 0;
 337
 338         iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL);
 339         if (!iov) {
 340                 pr_err("Unable to allocate fd_do_writev iov[]\n");
 341                 return -ENOMEM;
 342         }
 343
 344         for_each_sg(task->task_sg, sg, task->task_sg_nents, i) {
 345                 iov[i].iov_len = sg->length;
 346                 iov[i].iov_base = sg_virt(sg);
 347         }
 348
 349         old_fs = get_fs();
 350         set_fs(get_ds());
 351         ret = vfs_writev(fd, &iov[0], task->task_sg_nents, &pos);
 352         set_fs(old_fs);
 353
 354         kfree(iov);
 355
 356         if (ret < 0 || ret != task->task_size) {
 357                 pr_err("vfs_writev() returned %d\n", ret);
 358                 return (ret < 0 ? ret : -EINVAL);
 359         }
 360
 361         return 1;
 362 }
 363
 364 static void fd_emulate_sync_cache(struct se_task *task)
 365 {
 366         struct se_cmd *cmd = task->task_se_cmd;
 367         struct se_device *dev = cmd->se_dev;
 368         struct fd_dev *fd_dev = dev->dev_ptr;
 369         int immed = (cmd->t_task_cdb[1] & 0x2);
 370         loff_t start, end;
 371         int ret;
 372
 373         /*
 374          * If the Immediate bit is set, queue up the GOOD response
 375          * for this SYNCHRONIZE_CACHE op
 376          */
 377         if (immed)
 378                 transport_complete_sync_cache(cmd, 1);
 379
 380         /*
 381          * Determine if we will be flushing the entire device.
 382          */
 383         if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
 384                 start = 0;
 385                 end = LLONG_MAX;
 386         } else {
 387                 start = cmd->t_task_lba * dev->se_sub_dev->se_dev_attrib.block_size;
 388                 if (cmd->data_length)
 389                         end = start + cmd->data_length;
 390                 else
 391                         end = LLONG_MAX;
 392         }
 393
 394         ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
 395         if (ret != 0)
 396                 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
 397
 398         if (!immed)
 399                 transport_complete_sync_cache(cmd, ret == 0);
 400 }
 401
 402 /*
 403  * WRITE Force Unit Access (FUA) emulation on a per struct se_task
 404  * LBA range basis..
 405  */
 406 static void fd_emulate_write_fua(struct se_cmd *cmd, struct se_task *task)
 407 {
 408         struct se_device *dev = cmd->se_dev;
 409         struct fd_dev *fd_dev = dev->dev_ptr;
 410         loff_t start = task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size;
 411         loff_t end = start + task->task_size;
 412         int ret;
 413
 414         pr_debug("FILEIO: FUA WRITE LBA: %llu, bytes: %u\n",
 415                         task->task_lba, task->task_size);
 416
 417         ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
 418         if (ret != 0)
 419                 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
 420 }
 421
 422 static int fd_do_task(struct se_task *task)
 423 {
 424         struct se_cmd *cmd = task->task_se_cmd;
 425         struct se_device *dev = cmd->se_dev;
 426         int ret = 0;
 427
 428         /*
 429          * Call vectorized fileio functions to map struct scatterlist
 430          * physical memory addresses to struct iovec virtual memory.
 431          */
 432         if (task->task_data_direction == DMA_FROM_DEVICE) {
 433                 ret = fd_do_readv(task);
 434         } else {
 435                 ret = fd_do_writev(task);
 436
 437                 if (ret > 0 &&
 438                     dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0 &&
 439                     dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 &&
 440                     (cmd->se_cmd_flags & SCF_FUA)) {
 441                         /*
 442                          * We might need to be a bit smarter here
 443                          * and return some sense data to let the initiator
 444                          * know the FUA WRITE cache sync failed..?
 445                          */
 446                         fd_emulate_write_fua(cmd, task);
 447                 }
 448
 449         }
 450
 451         if (ret < 0) {
 452                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 453                 return ret;
 454         }
 455         if (ret) {
 456                 task->task_scsi_status = GOOD;
 457                 transport_complete_task(task, 1);
 458         }
 459         return 0;
 460 }
 461
 462 /*      fd_free_task(): (Part of se_subsystem_api_t template)
 463  *
 464  *
 465  */
 466 static void fd_free_task(struct se_task *task)
 467 {
 468         struct fd_request *req = FILE_REQ(task);
 469
 470         kfree(req);
 471 }
 472
 473 enum {
 474         Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
 475 };
 476
 477 static match_table_t tokens = {
 478         {Opt_fd_dev_name, "fd_dev_name=%s"},
 479         {Opt_fd_dev_size, "fd_dev_size=%s"},
 480         {Opt_fd_buffered_io, "fd_buffered_io=%d"},
 481         {Opt_err, NULL}
 482 };
 483
 484 static ssize_t fd_set_configfs_dev_params(
 485         struct se_hba *hba,
 486         struct se_subsystem_dev *se_dev,
 487         const char *page, ssize_t count)
 488 {
 489         struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
 490         char *orig, *ptr, *arg_p, *opts;
 491         substring_t args[MAX_OPT_ARGS];
 492         int ret = 0, arg, token;
 493
 494         opts = kstrdup(page, GFP_KERNEL);
 495         if (!opts)
 496                 return -ENOMEM;
 497
 498         orig = opts;
 499
 500         while ((ptr = strsep(&opts, ",\n")) != NULL) {
 501                 if (!*ptr)
 502                         continue;
 503
 504                 token = match_token(ptr, tokens, args);
 505                 switch (token) {
 506                 case Opt_fd_dev_name:
 507                         arg_p = match_strdup(&args[0]);
 508                         if (!arg_p) {
 509                                 ret = -ENOMEM;
 510                                 break;
 511                         }
 512                         snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME,
 513                                         "%s", arg_p);
 514                         kfree(arg_p);
 515                         pr_debug("FILEIO: Referencing Path: %s\n",
 516                                         fd_dev->fd_dev_name);
 517                         fd_dev->fbd_flags |= FBDF_HAS_PATH;
 518                         break;
 519                 case Opt_fd_dev_size:
 520                         arg_p = match_strdup(&args[0]);
 521                         if (!arg_p) {
 522                                 ret = -ENOMEM;
 523                                 break;
 524                         }
 525                         ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size);
 526                         kfree(arg_p);
 527                         if (ret < 0) {
 528                                 pr_err("strict_strtoull() failed for"
 529                                                 " fd_dev_size=\n");
 530                                 goto out;
 531                         }
 532                         pr_debug("FILEIO: Referencing Size: %llu"
 533                                         " bytes\n", fd_dev->fd_dev_size);
 534                         fd_dev->fbd_flags |= FBDF_HAS_SIZE;
 535                         break;
 536                 case Opt_fd_buffered_io:
 537                         match_int(args, &arg);
 538                         if (arg != 1) {
 539                                 pr_err("bogus fd_buffered_io=%d value\n", arg);
 540                                 ret = -EINVAL;
 541                                 goto out;
 542                         }
 543
 544                         pr_debug("FILEIO: Using buffered I/O"
 545                                 " operations for struct fd_dev\n");
 546
 547                         fd_dev->fbd_flags |= FDBD_USE_BUFFERED_IO;
 548                         break;
 549                 default:
 550                         break;
 551                 }
 552         }
 553
 554 out:
 555         kfree(orig);
 556         return (!ret) ? count : ret;
 557 }
 558
 559 static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev)
 560 {
 561         struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
 562
 563         if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
 564                 pr_err("Missing fd_dev_name=\n");
 565                 return -EINVAL;
 566         }
 567
 568         return 0;
 569 }
 570
 571 static ssize_t fd_show_configfs_dev_params(
 572         struct se_hba *hba,
 573         struct se_subsystem_dev *se_dev,
 574         char *b)
 575 {
 576         struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
 577         ssize_t bl = 0;
 578
 579         bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
 580         bl += sprintf(b + bl, "        File: %s  Size: %llu  Mode: %s\n",
 581                 fd_dev->fd_dev_name, fd_dev->fd_dev_size,
 582                 (fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO) ?
 583                 "Buffered" : "Synchronous");
 584         return bl;
 585 }
 586
 587 /*      fd_get_device_rev(): (Part of se_subsystem_api_t template)
 588  *
 589  *
 590  */
 591 static u32 fd_get_device_rev(struct se_device *dev)
 592 {
 593         return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
 594 }
 595
 596 /*      fd_get_device_type(): (Part of se_subsystem_api_t template)
 597  *
 598  *
 599  */
 600 static u32 fd_get_device_type(struct se_device *dev)
 601 {
 602         return TYPE_DISK;
 603 }
 604
 605 static sector_t fd_get_blocks(struct se_device *dev)
 606 {
 607         struct fd_dev *fd_dev = dev->dev_ptr;
 608         struct file *f = fd_dev->fd_file;
 609         struct inode *i = f->f_mapping->host;
 610         unsigned long long dev_size;
 611         /*
 612          * When using a file that references an underlying struct block_device,
 613          * ensure dev_size is always based on the current inode size in order
 614          * to handle underlying block_device resize operations.
 615          */
 616         if (S_ISBLK(i->i_mode))
 617                 dev_size = (i_size_read(i) - fd_dev->fd_block_size);
 618         else
 619                 dev_size = fd_dev->fd_dev_size;
 620
 621         return div_u64(dev_size, dev->se_sub_dev->se_dev_attrib.block_size);
 622 }
 623
 624 static struct se_subsystem_api fileio_template = {
 625         .name                   = "fileio",
 626         .owner                  = THIS_MODULE,
 627         .transport_type         = TRANSPORT_PLUGIN_VHBA_PDEV,
 628         .write_cache_emulated   = 1,
 629         .fua_write_emulated     = 1,
 630         .attach_hba             = fd_attach_hba,
 631         .detach_hba             = fd_detach_hba,
 632         .allocate_virtdevice    = fd_allocate_virtdevice,
 633         .create_virtdevice      = fd_create_virtdevice,
 634         .free_device            = fd_free_device,
 635         .alloc_task             = fd_alloc_task,
 636         .do_task                = fd_do_task,
 637         .do_sync_cache          = fd_emulate_sync_cache,
 638         .free_task              = fd_free_task,
 639         .check_configfs_dev_params = fd_check_configfs_dev_params,
 640         .set_configfs_dev_params = fd_set_configfs_dev_params,
 641         .show_configfs_dev_params = fd_show_configfs_dev_params,
 642         .get_device_rev         = fd_get_device_rev,
 643         .get_device_type        = fd_get_device_type,
 644         .get_blocks             = fd_get_blocks,
 645 };
 646
 647 static int __init fileio_module_init(void)
 648 {
 649         return transport_subsystem_register(&fileio_template);
 650 }
 651
 652 static void fileio_module_exit(void)
 653 {
 654         transport_subsystem_release(&fileio_template);
 655 }
 656
 657 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
 658 MODULE_AUTHOR("nab@Linux-iSCSI.org");
 659 MODULE_LICENSE("GPL");
 660
 661 module_init(fileio_module_init);
 662 module_exit(fileio_module_exit);