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