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