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/version.h> 30 #include <linux/string.h> 31 #include <linux/parser.h> 32 #include <linux/timer.h> 33 #include <linux/blkdev.h> 34 #include <linux/slab.h> 35 #include <linux/spinlock.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 #if 1 46 #define DEBUG_FD_CACHE(x...) printk(x) 47 #else 48 #define DEBUG_FD_CACHE(x...) 49 #endif 50 51 #if 1 52 #define DEBUG_FD_FUA(x...) printk(x) 53 #else 54 #define DEBUG_FD_FUA(x...) 55 #endif 56 57 static struct se_subsystem_api fileio_template; 58 59 /* fd_attach_hba(): (Part of se_subsystem_api_t template) 60 * 61 * 62 */ 63 static int fd_attach_hba(struct se_hba *hba, u32 host_id) 64 { 65 struct fd_host *fd_host; 66 67 fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); 68 if (!(fd_host)) { 69 printk(KERN_ERR "Unable to allocate memory for struct fd_host\n"); 70 return -1; 71 } 72 73 fd_host->fd_host_id = host_id; 74 75 atomic_set(&hba->left_queue_depth, FD_HBA_QUEUE_DEPTH); 76 atomic_set(&hba->max_queue_depth, FD_HBA_QUEUE_DEPTH); 77 hba->hba_ptr = (void *) fd_host; 78 79 printk(KERN_INFO "CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" 80 " Target Core Stack %s\n", hba->hba_id, FD_VERSION, 81 TARGET_CORE_MOD_VERSION); 82 printk(KERN_INFO "CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" 83 " Target Core with TCQ Depth: %d MaxSectors: %u\n", 84 hba->hba_id, fd_host->fd_host_id, 85 atomic_read(&hba->max_queue_depth), FD_MAX_SECTORS); 86 87 return 0; 88 } 89 90 static void fd_detach_hba(struct se_hba *hba) 91 { 92 struct fd_host *fd_host = hba->hba_ptr; 93 94 printk(KERN_INFO "CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" 95 " Target Core\n", hba->hba_id, fd_host->fd_host_id); 96 97 kfree(fd_host); 98 hba->hba_ptr = NULL; 99 } 100 101 static void *fd_allocate_virtdevice(struct se_hba *hba, const char *name) 102 { 103 struct fd_dev *fd_dev; 104 struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr; 105 106 fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); 107 if (!(fd_dev)) { 108 printk(KERN_ERR "Unable to allocate memory for struct fd_dev\n"); 109 return NULL; 110 } 111 112 fd_dev->fd_host = fd_host; 113 114 printk(KERN_INFO "FILEIO: Allocated fd_dev for %p\n", name); 115 116 return fd_dev; 117 } 118 119 /* fd_create_virtdevice(): (Part of se_subsystem_api_t template) 120 * 121 * 122 */ 123 static struct se_device *fd_create_virtdevice( 124 struct se_hba *hba, 125 struct se_subsystem_dev *se_dev, 126 void *p) 127 { 128 char *dev_p = NULL; 129 struct se_device *dev; 130 struct se_dev_limits dev_limits; 131 struct queue_limits *limits; 132 struct fd_dev *fd_dev = (struct fd_dev *) p; 133 struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr; 134 mm_segment_t old_fs; 135 struct file *file; 136 struct inode *inode = NULL; 137 int dev_flags = 0, flags, ret = -EINVAL; 138 139 memset(&dev_limits, 0, sizeof(struct se_dev_limits)); 140 141 old_fs = get_fs(); 142 set_fs(get_ds()); 143 dev_p = getname(fd_dev->fd_dev_name); 144 set_fs(old_fs); 145 146 if (IS_ERR(dev_p)) { 147 printk(KERN_ERR "getname(%s) failed: %lu\n", 148 fd_dev->fd_dev_name, IS_ERR(dev_p)); 149 ret = PTR_ERR(dev_p); 150 goto fail; 151 } 152 #if 0 153 if (di->no_create_file) 154 flags = O_RDWR | O_LARGEFILE; 155 else 156 flags = O_RDWR | O_CREAT | O_LARGEFILE; 157 #else 158 flags = O_RDWR | O_CREAT | O_LARGEFILE; 159 #endif 160 /* flags |= O_DIRECT; */ 161 /* 162 * If fd_buffered_io=1 has not been set explicitly (the default), 163 * use O_SYNC to force FILEIO writes to disk. 164 */ 165 if (!(fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO)) 166 flags |= O_SYNC; 167 168 file = filp_open(dev_p, flags, 0600); 169 if (IS_ERR(file)) { 170 printk(KERN_ERR "filp_open(%s) failed\n", dev_p); 171 ret = PTR_ERR(file); 172 goto fail; 173 } 174 if (!file || !file->f_dentry) { 175 printk(KERN_ERR "filp_open(%s) failed\n", dev_p); 176 goto fail; 177 } 178 fd_dev->fd_file = file; 179 /* 180 * If using a block backend with this struct file, we extract 181 * fd_dev->fd_[block,dev]_size from struct block_device. 182 * 183 * Otherwise, we use the passed fd_size= from configfs 184 */ 185 inode = file->f_mapping->host; 186 if (S_ISBLK(inode->i_mode)) { 187 struct request_queue *q; 188 /* 189 * Setup the local scope queue_limits from struct request_queue->limits 190 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. 191 */ 192 q = bdev_get_queue(inode->i_bdev); 193 limits = &dev_limits.limits; 194 limits->logical_block_size = bdev_logical_block_size(inode->i_bdev); 195 limits->max_hw_sectors = queue_max_hw_sectors(q); 196 limits->max_sectors = queue_max_sectors(q); 197 /* 198 * Determine the number of bytes from i_size_read() minus 199 * one (1) logical sector from underlying struct block_device 200 */ 201 fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); 202 fd_dev->fd_dev_size = (i_size_read(file->f_mapping->host) - 203 fd_dev->fd_block_size); 204 205 printk(KERN_INFO "FILEIO: Using size: %llu bytes from struct" 206 " block_device blocks: %llu logical_block_size: %d\n", 207 fd_dev->fd_dev_size, 208 div_u64(fd_dev->fd_dev_size, fd_dev->fd_block_size), 209 fd_dev->fd_block_size); 210 } else { 211 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { 212 printk(KERN_ERR "FILEIO: Missing fd_dev_size=" 213 " parameter, and no backing struct" 214 " block_device\n"); 215 goto fail; 216 } 217 218 limits = &dev_limits.limits; 219 limits->logical_block_size = FD_BLOCKSIZE; 220 limits->max_hw_sectors = FD_MAX_SECTORS; 221 limits->max_sectors = FD_MAX_SECTORS; 222 fd_dev->fd_block_size = FD_BLOCKSIZE; 223 } 224 225 dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 226 dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH; 227 228 dev = transport_add_device_to_core_hba(hba, &fileio_template, 229 se_dev, dev_flags, (void *)fd_dev, 230 &dev_limits, "FILEIO", FD_VERSION); 231 if (!(dev)) 232 goto fail; 233 234 fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 235 fd_dev->fd_queue_depth = dev->queue_depth; 236 237 printk(KERN_INFO "CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 238 " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 239 fd_dev->fd_dev_name, fd_dev->fd_dev_size); 240 241 putname(dev_p); 242 return dev; 243 fail: 244 if (fd_dev->fd_file) { 245 filp_close(fd_dev->fd_file, NULL); 246 fd_dev->fd_file = NULL; 247 } 248 putname(dev_p); 249 return ERR_PTR(ret); 250 } 251 252 /* fd_free_device(): (Part of se_subsystem_api_t template) 253 * 254 * 255 */ 256 static void fd_free_device(void *p) 257 { 258 struct fd_dev *fd_dev = (struct fd_dev *) p; 259 260 if (fd_dev->fd_file) { 261 filp_close(fd_dev->fd_file, NULL); 262 fd_dev->fd_file = NULL; 263 } 264 265 kfree(fd_dev); 266 } 267 268 static inline struct fd_request *FILE_REQ(struct se_task *task) 269 { 270 return container_of(task, struct fd_request, fd_task); 271 } 272 273 274 static struct se_task * 275 fd_alloc_task(struct se_cmd *cmd) 276 { 277 struct fd_request *fd_req; 278 279 fd_req = kzalloc(sizeof(struct fd_request), GFP_KERNEL); 280 if (!(fd_req)) { 281 printk(KERN_ERR "Unable to allocate struct fd_request\n"); 282 return NULL; 283 } 284 285 fd_req->fd_dev = SE_DEV(cmd)->dev_ptr; 286 287 return &fd_req->fd_task; 288 } 289 290 static int fd_do_readv(struct se_task *task) 291 { 292 struct fd_request *req = FILE_REQ(task); 293 struct file *fd = req->fd_dev->fd_file; 294 struct scatterlist *sg = task->task_sg; 295 struct iovec *iov; 296 mm_segment_t old_fs; 297 loff_t pos = (task->task_lba * DEV_ATTRIB(task->se_dev)->block_size); 298 int ret = 0, i; 299 300 iov = kzalloc(sizeof(struct iovec) * task->task_sg_num, GFP_KERNEL); 301 if (!(iov)) { 302 printk(KERN_ERR "Unable to allocate fd_do_readv iov[]\n"); 303 return -1; 304 } 305 306 for (i = 0; i < task->task_sg_num; i++) { 307 iov[i].iov_len = sg[i].length; 308 iov[i].iov_base = sg_virt(&sg[i]); 309 } 310 311 old_fs = get_fs(); 312 set_fs(get_ds()); 313 ret = vfs_readv(fd, &iov[0], task->task_sg_num, &pos); 314 set_fs(old_fs); 315 316 kfree(iov); 317 /* 318 * Return zeros and GOOD status even if the READ did not return 319 * the expected virt_size for struct file w/o a backing struct 320 * block_device. 321 */ 322 if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { 323 if (ret < 0 || ret != task->task_size) { 324 printk(KERN_ERR "vfs_readv() returned %d," 325 " expecting %d for S_ISBLK\n", ret, 326 (int)task->task_size); 327 return -1; 328 } 329 } else { 330 if (ret < 0) { 331 printk(KERN_ERR "vfs_readv() returned %d for non" 332 " S_ISBLK\n", ret); 333 return -1; 334 } 335 } 336 337 return 1; 338 } 339 340 static int fd_do_writev(struct se_task *task) 341 { 342 struct fd_request *req = FILE_REQ(task); 343 struct file *fd = req->fd_dev->fd_file; 344 struct scatterlist *sg = task->task_sg; 345 struct iovec *iov; 346 mm_segment_t old_fs; 347 loff_t pos = (task->task_lba * DEV_ATTRIB(task->se_dev)->block_size); 348 int ret, i = 0; 349 350 iov = kzalloc(sizeof(struct iovec) * task->task_sg_num, GFP_KERNEL); 351 if (!(iov)) { 352 printk(KERN_ERR "Unable to allocate fd_do_writev iov[]\n"); 353 return -1; 354 } 355 356 for (i = 0; i < task->task_sg_num; i++) { 357 iov[i].iov_len = sg[i].length; 358 iov[i].iov_base = sg_virt(&sg[i]); 359 } 360 361 old_fs = get_fs(); 362 set_fs(get_ds()); 363 ret = vfs_writev(fd, &iov[0], task->task_sg_num, &pos); 364 set_fs(old_fs); 365 366 kfree(iov); 367 368 if (ret < 0 || ret != task->task_size) { 369 printk(KERN_ERR "vfs_writev() returned %d\n", ret); 370 return -1; 371 } 372 373 return 1; 374 } 375 376 static void fd_emulate_sync_cache(struct se_task *task) 377 { 378 struct se_cmd *cmd = TASK_CMD(task); 379 struct se_device *dev = cmd->se_dev; 380 struct fd_dev *fd_dev = dev->dev_ptr; 381 int immed = (cmd->t_task->t_task_cdb[1] & 0x2); 382 loff_t start, end; 383 int ret; 384 385 /* 386 * If the Immediate bit is set, queue up the GOOD response 387 * for this SYNCHRONIZE_CACHE op 388 */ 389 if (immed) 390 transport_complete_sync_cache(cmd, 1); 391 392 /* 393 * Determine if we will be flushing the entire device. 394 */ 395 if (cmd->t_task->t_task_lba == 0 && cmd->data_length == 0) { 396 start = 0; 397 end = LLONG_MAX; 398 } else { 399 start = cmd->t_task->t_task_lba * DEV_ATTRIB(dev)->block_size; 400 if (cmd->data_length) 401 end = start + cmd->data_length; 402 else 403 end = LLONG_MAX; 404 } 405 406 ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 407 if (ret != 0) 408 printk(KERN_ERR "FILEIO: vfs_fsync_range() failed: %d\n", ret); 409 410 if (!immed) 411 transport_complete_sync_cache(cmd, ret == 0); 412 } 413 414 /* 415 * Tell TCM Core that we are capable of WriteCache emulation for 416 * an underlying struct se_device. 417 */ 418 static int fd_emulated_write_cache(struct se_device *dev) 419 { 420 return 1; 421 } 422 423 static int fd_emulated_dpo(struct se_device *dev) 424 { 425 return 0; 426 } 427 /* 428 * Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs 429 * for TYPE_DISK. 430 */ 431 static int fd_emulated_fua_write(struct se_device *dev) 432 { 433 return 1; 434 } 435 436 static int fd_emulated_fua_read(struct se_device *dev) 437 { 438 return 0; 439 } 440 441 /* 442 * WRITE Force Unit Access (FUA) emulation on a per struct se_task 443 * LBA range basis.. 444 */ 445 static void fd_emulate_write_fua(struct se_cmd *cmd, struct se_task *task) 446 { 447 struct se_device *dev = cmd->se_dev; 448 struct fd_dev *fd_dev = dev->dev_ptr; 449 loff_t start = task->task_lba * DEV_ATTRIB(dev)->block_size; 450 loff_t end = start + task->task_size; 451 int ret; 452 453 DEBUG_FD_CACHE("FILEIO: FUA WRITE LBA: %llu, bytes: %u\n", 454 task->task_lba, task->task_size); 455 456 ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 457 if (ret != 0) 458 printk(KERN_ERR "FILEIO: vfs_fsync_range() failed: %d\n", ret); 459 } 460 461 static int fd_do_task(struct se_task *task) 462 { 463 struct se_cmd *cmd = task->task_se_cmd; 464 struct se_device *dev = cmd->se_dev; 465 int ret = 0; 466 467 /* 468 * Call vectorized fileio functions to map struct scatterlist 469 * physical memory addresses to struct iovec virtual memory. 470 */ 471 if (task->task_data_direction == DMA_FROM_DEVICE) { 472 ret = fd_do_readv(task); 473 } else { 474 ret = fd_do_writev(task); 475 476 if (ret > 0 && 477 DEV_ATTRIB(dev)->emulate_write_cache > 0 && 478 DEV_ATTRIB(dev)->emulate_fua_write > 0 && 479 T_TASK(cmd)->t_tasks_fua) { 480 /* 481 * We might need to be a bit smarter here 482 * and return some sense data to let the initiator 483 * know the FUA WRITE cache sync failed..? 484 */ 485 fd_emulate_write_fua(cmd, task); 486 } 487 488 } 489 490 if (ret < 0) 491 return ret; 492 if (ret) { 493 task->task_scsi_status = GOOD; 494 transport_complete_task(task, 1); 495 } 496 return PYX_TRANSPORT_SENT_TO_TRANSPORT; 497 } 498 499 /* fd_free_task(): (Part of se_subsystem_api_t template) 500 * 501 * 502 */ 503 static void fd_free_task(struct se_task *task) 504 { 505 struct fd_request *req = FILE_REQ(task); 506 507 kfree(req); 508 } 509 510 enum { 511 Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err 512 }; 513 514 static match_table_t tokens = { 515 {Opt_fd_dev_name, "fd_dev_name=%s"}, 516 {Opt_fd_dev_size, "fd_dev_size=%s"}, 517 {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 518 {Opt_err, NULL} 519 }; 520 521 static ssize_t fd_set_configfs_dev_params( 522 struct se_hba *hba, 523 struct se_subsystem_dev *se_dev, 524 const char *page, ssize_t count) 525 { 526 struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; 527 char *orig, *ptr, *arg_p, *opts; 528 substring_t args[MAX_OPT_ARGS]; 529 int ret = 0, arg, token; 530 531 opts = kstrdup(page, GFP_KERNEL); 532 if (!opts) 533 return -ENOMEM; 534 535 orig = opts; 536 537 while ((ptr = strsep(&opts, ",")) != NULL) { 538 if (!*ptr) 539 continue; 540 541 token = match_token(ptr, tokens, args); 542 switch (token) { 543 case Opt_fd_dev_name: 544 arg_p = match_strdup(&args[0]); 545 if (!arg_p) { 546 ret = -ENOMEM; 547 break; 548 } 549 snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME, 550 "%s", arg_p); 551 kfree(arg_p); 552 printk(KERN_INFO "FILEIO: Referencing Path: %s\n", 553 fd_dev->fd_dev_name); 554 fd_dev->fbd_flags |= FBDF_HAS_PATH; 555 break; 556 case Opt_fd_dev_size: 557 arg_p = match_strdup(&args[0]); 558 if (!arg_p) { 559 ret = -ENOMEM; 560 break; 561 } 562 ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); 563 kfree(arg_p); 564 if (ret < 0) { 565 printk(KERN_ERR "strict_strtoull() failed for" 566 " fd_dev_size=\n"); 567 goto out; 568 } 569 printk(KERN_INFO "FILEIO: Referencing Size: %llu" 570 " bytes\n", fd_dev->fd_dev_size); 571 fd_dev->fbd_flags |= FBDF_HAS_SIZE; 572 break; 573 case Opt_fd_buffered_io: 574 match_int(args, &arg); 575 if (arg != 1) { 576 printk(KERN_ERR "bogus fd_buffered_io=%d value\n", arg); 577 ret = -EINVAL; 578 goto out; 579 } 580 581 printk(KERN_INFO "FILEIO: Using buffered I/O" 582 " operations for struct fd_dev\n"); 583 584 fd_dev->fbd_flags |= FDBD_USE_BUFFERED_IO; 585 break; 586 default: 587 break; 588 } 589 } 590 591 out: 592 kfree(orig); 593 return (!ret) ? count : ret; 594 } 595 596 static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) 597 { 598 struct fd_dev *fd_dev = (struct fd_dev *) se_dev->se_dev_su_ptr; 599 600 if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { 601 printk(KERN_ERR "Missing fd_dev_name=\n"); 602 return -1; 603 } 604 605 return 0; 606 } 607 608 static ssize_t fd_show_configfs_dev_params( 609 struct se_hba *hba, 610 struct se_subsystem_dev *se_dev, 611 char *b) 612 { 613 struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; 614 ssize_t bl = 0; 615 616 bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 617 bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", 618 fd_dev->fd_dev_name, fd_dev->fd_dev_size, 619 (fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO) ? 620 "Buffered" : "Synchronous"); 621 return bl; 622 } 623 624 /* fd_get_cdb(): (Part of se_subsystem_api_t template) 625 * 626 * 627 */ 628 static unsigned char *fd_get_cdb(struct se_task *task) 629 { 630 struct fd_request *req = FILE_REQ(task); 631 632 return req->fd_scsi_cdb; 633 } 634 635 /* fd_get_device_rev(): (Part of se_subsystem_api_t template) 636 * 637 * 638 */ 639 static u32 fd_get_device_rev(struct se_device *dev) 640 { 641 return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ 642 } 643 644 /* fd_get_device_type(): (Part of se_subsystem_api_t template) 645 * 646 * 647 */ 648 static u32 fd_get_device_type(struct se_device *dev) 649 { 650 return TYPE_DISK; 651 } 652 653 static sector_t fd_get_blocks(struct se_device *dev) 654 { 655 struct fd_dev *fd_dev = dev->dev_ptr; 656 unsigned long long blocks_long = div_u64(fd_dev->fd_dev_size, 657 DEV_ATTRIB(dev)->block_size); 658 659 return blocks_long; 660 } 661 662 static struct se_subsystem_api fileio_template = { 663 .name = "fileio", 664 .owner = THIS_MODULE, 665 .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, 666 .attach_hba = fd_attach_hba, 667 .detach_hba = fd_detach_hba, 668 .allocate_virtdevice = fd_allocate_virtdevice, 669 .create_virtdevice = fd_create_virtdevice, 670 .free_device = fd_free_device, 671 .dpo_emulated = fd_emulated_dpo, 672 .fua_write_emulated = fd_emulated_fua_write, 673 .fua_read_emulated = fd_emulated_fua_read, 674 .write_cache_emulated = fd_emulated_write_cache, 675 .alloc_task = fd_alloc_task, 676 .do_task = fd_do_task, 677 .do_sync_cache = fd_emulate_sync_cache, 678 .free_task = fd_free_task, 679 .check_configfs_dev_params = fd_check_configfs_dev_params, 680 .set_configfs_dev_params = fd_set_configfs_dev_params, 681 .show_configfs_dev_params = fd_show_configfs_dev_params, 682 .get_cdb = fd_get_cdb, 683 .get_device_rev = fd_get_device_rev, 684 .get_device_type = fd_get_device_type, 685 .get_blocks = fd_get_blocks, 686 }; 687 688 static int __init fileio_module_init(void) 689 { 690 return transport_subsystem_register(&fileio_template); 691 } 692 693 static void fileio_module_exit(void) 694 { 695 transport_subsystem_release(&fileio_template); 696 } 697 698 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 699 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 700 MODULE_LICENSE("GPL"); 701 702 module_init(fileio_module_init); 703 module_exit(fileio_module_exit); 704