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  * (c) Copyright 2005-2012 RisingTide Systems LLC.
   7  *
   8  * Nicholas A. Bellinger <nab@kernel.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  ******************************************************************************/
  25
  26 #include <linux/string.h>
  27 #include <linux/parser.h>
  28 #include <linux/timer.h>
  29 #include <linux/blkdev.h>
  30 #include <linux/slab.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/module.h>
  33 #include <scsi/scsi.h>
  34 #include <scsi/scsi_host.h>
  35
  36 #include <target/target_core_base.h>
  37 #include <target/target_core_backend.h>
  38
  39 #include "target_core_file.h"
  40
  41 static inline struct fd_dev *FD_DEV(struct se_device *dev)
  42 {
  43         return container_of(dev, struct fd_dev, dev);
  44 }
  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 struct se_device *fd_alloc_device(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->dev;
 101 }
 102
 103 static int fd_configure_device(struct se_device *dev)
 104 {
 105         struct fd_dev *fd_dev = FD_DEV(dev);
 106         struct fd_host *fd_host = dev->se_hba->hba_ptr;
 107         struct file *file;
 108         struct inode *inode = NULL;
 109         int flags, ret = -EINVAL;
 110
 111         if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
 112                 pr_err("Missing fd_dev_name=\n");
 113                 return -EINVAL;
 114         }
 115
 116         /*
 117          * Use O_DSYNC by default instead of O_SYNC to forgo syncing
 118          * of pure timestamp updates.
 119          */
 120         flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
 121
 122         /*
 123          * Optionally allow fd_buffered_io=1 to be enabled for people
 124          * who want use the fs buffer cache as an WriteCache mechanism.
 125          *
 126          * This means that in event of a hard failure, there is a risk
 127          * of silent data-loss if the SCSI client has *not* performed a
 128          * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE
 129          * to write-out the entire device cache.
 130          */
 131         if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
 132                 pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n");
 133                 flags &= ~O_DSYNC;
 134         }
 135
 136         file = filp_open(fd_dev->fd_dev_name, flags, 0600);
 137         if (IS_ERR(file)) {
 138                 pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name);
 139                 ret = PTR_ERR(file);
 140                 goto fail;
 141         }
 142         fd_dev->fd_file = file;
 143         /*
 144          * If using a block backend with this struct file, we extract
 145          * fd_dev->fd_[block,dev]_size from struct block_device.
 146          *
 147          * Otherwise, we use the passed fd_size= from configfs
 148          */
 149         inode = file->f_mapping->host;
 150         if (S_ISBLK(inode->i_mode)) {
 151                 struct request_queue *q = bdev_get_queue(inode->i_bdev);
 152                 unsigned long long dev_size;
 153
 154                 dev->dev_attrib.hw_block_size =
 155                         bdev_logical_block_size(inode->i_bdev);
 156                 dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q);
 157
 158                 /*
 159                  * Determine the number of bytes from i_size_read() minus
 160                  * one (1) logical sector from underlying struct block_device
 161                  */
 162                 dev_size = (i_size_read(file->f_mapping->host) -
 163                                        fd_dev->fd_block_size);
 164
 165                 pr_debug("FILEIO: Using size: %llu bytes from struct"
 166                         " block_device blocks: %llu logical_block_size: %d\n",
 167                         dev_size, div_u64(dev_size, fd_dev->fd_block_size),
 168                         fd_dev->fd_block_size);
 169         } else {
 170                 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
 171                         pr_err("FILEIO: Missing fd_dev_size="
 172                                 " parameter, and no backing struct"
 173                                 " block_device\n");
 174                         goto fail;
 175                 }
 176
 177                 dev->dev_attrib.hw_block_size = FD_BLOCKSIZE;
 178                 dev->dev_attrib.hw_max_sectors = FD_MAX_SECTORS;
 179         }
 180
 181         fd_dev->fd_block_size = dev->dev_attrib.hw_block_size;
 182
 183         dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
 184
 185         if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
 186                 pr_debug("FILEIO: Forcing setting of emulate_write_cache=1"
 187                         " with FDBD_HAS_BUFFERED_IO_WCE\n");
 188                 dev->dev_attrib.emulate_write_cache = 1;
 189         }
 190
 191         fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
 192         fd_dev->fd_queue_depth = dev->queue_depth;
 193         /*
 194          * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB)
 195          * based upon struct iovec limit for vfs_writev()
 196          */
 197         dev->dev_attrib.max_write_same_len = 0x1000;
 198
 199         pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
 200                 " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
 201                         fd_dev->fd_dev_name, fd_dev->fd_dev_size);
 202
 203         return 0;
 204 fail:
 205         if (fd_dev->fd_file) {
 206                 filp_close(fd_dev->fd_file, NULL);
 207                 fd_dev->fd_file = NULL;
 208         }
 209         return ret;
 210 }
 211
 212 static void fd_free_device(struct se_device *dev)
 213 {
 214         struct fd_dev *fd_dev = FD_DEV(dev);
 215
 216         if (fd_dev->fd_file) {
 217                 filp_close(fd_dev->fd_file, NULL);
 218                 fd_dev->fd_file = NULL;
 219         }
 220
 221         kfree(fd_dev);
 222 }
 223
 224 static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl,
 225                 u32 sgl_nents, int is_write)
 226 {
 227         struct se_device *se_dev = cmd->se_dev;
 228         struct fd_dev *dev = FD_DEV(se_dev);
 229         struct file *fd = dev->fd_file;
 230         struct scatterlist *sg;
 231         struct iovec *iov;
 232         mm_segment_t old_fs;
 233         loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size);
 234         int ret = 0, i;
 235
 236         iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL);
 237         if (!iov) {
 238                 pr_err("Unable to allocate fd_do_readv iov[]\n");
 239                 return -ENOMEM;
 240         }
 241
 242         for_each_sg(sgl, sg, sgl_nents, i) {
 243                 iov[i].iov_len = sg->length;
 244                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset;
 245         }
 246
 247         old_fs = get_fs();
 248         set_fs(get_ds());
 249
 250         if (is_write)
 251                 ret = vfs_writev(fd, &iov[0], sgl_nents, &pos);
 252         else
 253                 ret = vfs_readv(fd, &iov[0], sgl_nents, &pos);
 254
 255         set_fs(old_fs);
 256
 257         for_each_sg(sgl, sg, sgl_nents, i)
 258                 kunmap(sg_page(sg));
 259
 260         kfree(iov);
 261
 262         if (is_write) {
 263                 if (ret < 0 || ret != cmd->data_length) {
 264                         pr_err("%s() write returned %d\n", __func__, ret);
 265                         return (ret < 0 ? ret : -EINVAL);
 266                 }
 267         } else {
 268                 /*
 269                  * Return zeros and GOOD status even if the READ did not return
 270                  * the expected virt_size for struct file w/o a backing struct
 271                  * block_device.
 272                  */
 273                 if (S_ISBLK(file_inode(fd)->i_mode)) {
 274                         if (ret < 0 || ret != cmd->data_length) {
 275                                 pr_err("%s() returned %d, expecting %u for "
 276                                                 "S_ISBLK\n", __func__, ret,
 277                                                 cmd->data_length);
 278                                 return (ret < 0 ? ret : -EINVAL);
 279                         }
 280                 } else {
 281                         if (ret < 0) {
 282                                 pr_err("%s() returned %d for non S_ISBLK\n",
 283                                                 __func__, ret);
 284                                 return ret;
 285                         }
 286                 }
 287         }
 288         return 1;
 289 }
 290
 291 static sense_reason_t
 292 fd_execute_sync_cache(struct se_cmd *cmd)
 293 {
 294         struct se_device *dev = cmd->se_dev;
 295         struct fd_dev *fd_dev = FD_DEV(dev);
 296         int immed = (cmd->t_task_cdb[1] & 0x2);
 297         loff_t start, end;
 298         int ret;
 299
 300         /*
 301          * If the Immediate bit is set, queue up the GOOD response
 302          * for this SYNCHRONIZE_CACHE op
 303          */
 304         if (immed)
 305                 target_complete_cmd(cmd, SAM_STAT_GOOD);
 306
 307         /*
 308          * Determine if we will be flushing the entire device.
 309          */
 310         if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
 311                 start = 0;
 312                 end = LLONG_MAX;
 313         } else {
 314                 start = cmd->t_task_lba * dev->dev_attrib.block_size;
 315                 if (cmd->data_length)
 316                         end = start + cmd->data_length;
 317                 else
 318                         end = LLONG_MAX;
 319         }
 320
 321         ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
 322         if (ret != 0)
 323                 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
 324
 325         if (immed)
 326                 return 0;
 327
 328         if (ret)
 329                 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
 330         else
 331                 target_complete_cmd(cmd, SAM_STAT_GOOD);
 332
 333         return 0;
 334 }
 335
 336 static unsigned char *
 337 fd_setup_write_same_buf(struct se_cmd *cmd, struct scatterlist *sg,
 338                     unsigned int len)
 339 {
 340         struct se_device *se_dev = cmd->se_dev;
 341         unsigned int block_size = se_dev->dev_attrib.block_size;
 342         unsigned int i = 0, end;
 343         unsigned char *buf, *p, *kmap_buf;
 344
 345         buf = kzalloc(min_t(unsigned int, len, PAGE_SIZE), GFP_KERNEL);
 346         if (!buf) {
 347                 pr_err("Unable to allocate fd_execute_write_same buf\n");
 348                 return NULL;
 349         }
 350
 351         kmap_buf = kmap(sg_page(sg)) + sg->offset;
 352         if (!kmap_buf) {
 353                 pr_err("kmap() failed in fd_setup_write_same\n");
 354                 kfree(buf);
 355                 return NULL;
 356         }
 357         /*
 358          * Fill local *buf to contain multiple WRITE_SAME blocks up to
 359          * min(len, PAGE_SIZE)
 360          */
 361         p = buf;
 362         end = min_t(unsigned int, len, PAGE_SIZE);
 363
 364         while (i < end) {
 365                 memcpy(p, kmap_buf, block_size);
 366
 367                 i += block_size;
 368                 p += block_size;
 369         }
 370         kunmap(sg_page(sg));
 371
 372         return buf;
 373 }
 374
 375 static sense_reason_t
 376 fd_execute_write_same(struct se_cmd *cmd)
 377 {
 378         struct se_device *se_dev = cmd->se_dev;
 379         struct fd_dev *fd_dev = FD_DEV(se_dev);
 380         struct file *f = fd_dev->fd_file;
 381         struct scatterlist *sg;
 382         struct iovec *iov;
 383         mm_segment_t old_fs;
 384         sector_t nolb = sbc_get_write_same_sectors(cmd);
 385         loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
 386         unsigned int len, len_tmp, iov_num;
 387         int i, rc;
 388         unsigned char *buf;
 389
 390         if (!nolb) {
 391                 target_complete_cmd(cmd, SAM_STAT_GOOD);
 392                 return 0;
 393         }
 394         sg = &cmd->t_data_sg[0];
 395
 396         if (cmd->t_data_nents > 1 ||
 397             sg->length != cmd->se_dev->dev_attrib.block_size) {
 398                 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
 399                         " block_size: %u\n", cmd->t_data_nents, sg->length,
 400                         cmd->se_dev->dev_attrib.block_size);
 401                 return TCM_INVALID_CDB_FIELD;
 402         }
 403
 404         len = len_tmp = nolb * se_dev->dev_attrib.block_size;
 405         iov_num = DIV_ROUND_UP(len, PAGE_SIZE);
 406
 407         buf = fd_setup_write_same_buf(cmd, sg, len);
 408         if (!buf)
 409                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 410
 411         iov = vzalloc(sizeof(struct iovec) * iov_num);
 412         if (!iov) {
 413                 pr_err("Unable to allocate fd_execute_write_same iovecs\n");
 414                 kfree(buf);
 415                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 416         }
 417         /*
 418          * Map the single fabric received scatterlist block now populated
 419          * in *buf into each iovec for I/O submission.
 420          */
 421         for (i = 0; i < iov_num; i++) {
 422                 iov[i].iov_base = buf;
 423                 iov[i].iov_len = min_t(unsigned int, len_tmp, PAGE_SIZE);
 424                 len_tmp -= iov[i].iov_len;
 425         }
 426
 427         old_fs = get_fs();
 428         set_fs(get_ds());
 429         rc = vfs_writev(f, &iov[0], iov_num, &pos);
 430         set_fs(old_fs);
 431
 432         vfree(iov);
 433         kfree(buf);
 434
 435         if (rc < 0 || rc != len) {
 436                 pr_err("vfs_writev() returned %d for write same\n", rc);
 437                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 438         }
 439
 440         target_complete_cmd(cmd, SAM_STAT_GOOD);
 441         return 0;
 442 }
 443
 444 static sense_reason_t
 445 fd_execute_rw(struct se_cmd *cmd)
 446 {
 447         struct scatterlist *sgl = cmd->t_data_sg;
 448         u32 sgl_nents = cmd->t_data_nents;
 449         enum dma_data_direction data_direction = cmd->data_direction;
 450         struct se_device *dev = cmd->se_dev;
 451         int ret = 0;
 452
 453         /*
 454          * Call vectorized fileio functions to map struct scatterlist
 455          * physical memory addresses to struct iovec virtual memory.
 456          */
 457         if (data_direction == DMA_FROM_DEVICE) {
 458                 ret = fd_do_rw(cmd, sgl, sgl_nents, 0);
 459         } else {
 460                 ret = fd_do_rw(cmd, sgl, sgl_nents, 1);
 461                 /*
 462                  * Perform implict vfs_fsync_range() for fd_do_writev() ops
 463                  * for SCSI WRITEs with Forced Unit Access (FUA) set.
 464                  * Allow this to happen independent of WCE=0 setting.
 465                  */
 466                 if (ret > 0 &&
 467                     dev->dev_attrib.emulate_fua_write > 0 &&
 468                     (cmd->se_cmd_flags & SCF_FUA)) {
 469                         struct fd_dev *fd_dev = FD_DEV(dev);
 470                         loff_t start = cmd->t_task_lba *
 471                                 dev->dev_attrib.block_size;
 472                         loff_t end = start + cmd->data_length;
 473
 474                         vfs_fsync_range(fd_dev->fd_file, start, end, 1);
 475                 }
 476         }
 477
 478         if (ret < 0)
 479                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 480
 481         if (ret)
 482                 target_complete_cmd(cmd, SAM_STAT_GOOD);
 483         return 0;
 484 }
 485
 486 enum {
 487         Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
 488 };
 489
 490 static match_table_t tokens = {
 491         {Opt_fd_dev_name, "fd_dev_name=%s"},
 492         {Opt_fd_dev_size, "fd_dev_size=%s"},
 493         {Opt_fd_buffered_io, "fd_buffered_io=%d"},
 494         {Opt_err, NULL}
 495 };
 496
 497 static ssize_t fd_set_configfs_dev_params(struct se_device *dev,
 498                 const char *page, ssize_t count)
 499 {
 500         struct fd_dev *fd_dev = FD_DEV(dev);
 501         char *orig, *ptr, *arg_p, *opts;
 502         substring_t args[MAX_OPT_ARGS];
 503         int ret = 0, arg, token;
 504
 505         opts = kstrdup(page, GFP_KERNEL);
 506         if (!opts)
 507                 return -ENOMEM;
 508
 509         orig = opts;
 510
 511         while ((ptr = strsep(&opts, ",\n")) != NULL) {
 512                 if (!*ptr)
 513                         continue;
 514
 515                 token = match_token(ptr, tokens, args);
 516                 switch (token) {
 517                 case Opt_fd_dev_name:
 518                         if (match_strlcpy(fd_dev->fd_dev_name, &args[0],
 519                                 FD_MAX_DEV_NAME) == 0) {
 520                                 ret = -EINVAL;
 521                                 break;
 522                         }
 523                         pr_debug("FILEIO: Referencing Path: %s\n",
 524                                         fd_dev->fd_dev_name);
 525                         fd_dev->fbd_flags |= FBDF_HAS_PATH;
 526                         break;
 527                 case Opt_fd_dev_size:
 528                         arg_p = match_strdup(&args[0]);
 529                         if (!arg_p) {
 530                                 ret = -ENOMEM;
 531                                 break;
 532                         }
 533                         ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size);
 534                         kfree(arg_p);
 535                         if (ret < 0) {
 536                                 pr_err("strict_strtoull() failed for"
 537                                                 " fd_dev_size=\n");
 538                                 goto out;
 539                         }
 540                         pr_debug("FILEIO: Referencing Size: %llu"
 541                                         " bytes\n", fd_dev->fd_dev_size);
 542                         fd_dev->fbd_flags |= FBDF_HAS_SIZE;
 543                         break;
 544                 case Opt_fd_buffered_io:
 545                         match_int(args, &arg);
 546                         if (arg != 1) {
 547                                 pr_err("bogus fd_buffered_io=%d value\n", arg);
 548                                 ret = -EINVAL;
 549                                 goto out;
 550                         }
 551
 552                         pr_debug("FILEIO: Using buffered I/O"
 553                                 " operations for struct fd_dev\n");
 554
 555                         fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE;
 556                         break;
 557                 default:
 558                         break;
 559                 }
 560         }
 561
 562 out:
 563         kfree(orig);
 564         return (!ret) ? count : ret;
 565 }
 566
 567 static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b)
 568 {
 569         struct fd_dev *fd_dev = FD_DEV(dev);
 570         ssize_t bl = 0;
 571
 572         bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
 573         bl += sprintf(b + bl, "        File: %s  Size: %llu  Mode: %s\n",
 574                 fd_dev->fd_dev_name, fd_dev->fd_dev_size,
 575                 (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ?
 576                 "Buffered-WCE" : "O_DSYNC");
 577         return bl;
 578 }
 579
 580 static sector_t fd_get_blocks(struct se_device *dev)
 581 {
 582         struct fd_dev *fd_dev = FD_DEV(dev);
 583         struct file *f = fd_dev->fd_file;
 584         struct inode *i = f->f_mapping->host;
 585         unsigned long long dev_size;
 586         /*
 587          * When using a file that references an underlying struct block_device,
 588          * ensure dev_size is always based on the current inode size in order
 589          * to handle underlying block_device resize operations.
 590          */
 591         if (S_ISBLK(i->i_mode))
 592                 dev_size = (i_size_read(i) - fd_dev->fd_block_size);
 593         else
 594                 dev_size = fd_dev->fd_dev_size;
 595
 596         return div_u64(dev_size, dev->dev_attrib.block_size);
 597 }
 598
 599 static struct sbc_ops fd_sbc_ops = {
 600         .execute_rw             = fd_execute_rw,
 601         .execute_sync_cache     = fd_execute_sync_cache,
 602         .execute_write_same     = fd_execute_write_same,
 603 };
 604
 605 static sense_reason_t
 606 fd_parse_cdb(struct se_cmd *cmd)
 607 {
 608         return sbc_parse_cdb(cmd, &fd_sbc_ops);
 609 }
 610
 611 static struct se_subsystem_api fileio_template = {
 612         .name                   = "fileio",
 613         .inquiry_prod           = "FILEIO",
 614         .inquiry_rev            = FD_VERSION,
 615         .owner                  = THIS_MODULE,
 616         .transport_type         = TRANSPORT_PLUGIN_VHBA_PDEV,
 617         .attach_hba             = fd_attach_hba,
 618         .detach_hba             = fd_detach_hba,
 619         .alloc_device           = fd_alloc_device,
 620         .configure_device       = fd_configure_device,
 621         .free_device            = fd_free_device,
 622         .parse_cdb              = fd_parse_cdb,
 623         .set_configfs_dev_params = fd_set_configfs_dev_params,
 624         .show_configfs_dev_params = fd_show_configfs_dev_params,
 625         .get_device_type        = sbc_get_device_type,
 626         .get_blocks             = fd_get_blocks,
 627 };
 628
 629 static int __init fileio_module_init(void)
 630 {
 631         return transport_subsystem_register(&fileio_template);
 632 }
 633
 634 static void fileio_module_exit(void)
 635 {
 636         transport_subsystem_release(&fileio_template);
 637 }
 638
 639 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
 640 MODULE_AUTHOR("nab@Linux-iSCSI.org");
 641 MODULE_LICENSE("GPL");
 642
 643 module_init(fileio_module_init);
 644 module_exit(fileio_module_exit);