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/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 explictly (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);