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 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 fd_dev *dev = req->fd_task.se_dev->dev_ptr;
 277         struct file *fd = dev->fd_file;
 278         struct scatterlist *sg = task->task_sg;
 279         struct iovec *iov;
 280         mm_segment_t old_fs;
 281         loff_t pos = (task->task_lba *
 282                       task->se_dev->se_sub_dev->se_dev_attrib.block_size);
 283         int ret = 0, i;
 284
 285         iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL);
 286         if (!iov) {
 287                 pr_err("Unable to allocate fd_do_readv iov[]\n");
 288                 return -ENOMEM;
 289         }
 290
 291         for (i = 0; i < task->task_sg_nents; i++) {
 292                 iov[i].iov_len = sg[i].length;
 293                 iov[i].iov_base = sg_virt(&sg[i]);
 294         }
 295
 296         old_fs = get_fs();
 297         set_fs(get_ds());
 298         ret = vfs_readv(fd, &iov[0], task->task_sg_nents, &pos);
 299         set_fs(old_fs);
 300
 301         kfree(iov);
 302         /*
 303          * Return zeros and GOOD status even if the READ did not return
 304          * the expected virt_size for struct file w/o a backing struct
 305          * block_device.
 306          */
 307         if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) {
 308                 if (ret < 0 || ret != task->task_size) {
 309                         pr_err("vfs_readv() returned %d,"
 310                                 " expecting %d for S_ISBLK\n", ret,
 311                                 (int)task->task_size);
 312                         return (ret < 0 ? ret : -EINVAL);
 313                 }
 314         } else {
 315                 if (ret < 0) {
 316                         pr_err("vfs_readv() returned %d for non"
 317                                 " S_ISBLK\n", ret);
 318                         return ret;
 319                 }
 320         }
 321
 322         return 1;
 323 }
 324
 325 static int fd_do_writev(struct se_task *task)
 326 {
 327         struct fd_request *req = FILE_REQ(task);
 328         struct fd_dev *dev = req->fd_task.se_dev->dev_ptr;
 329         struct file *fd = dev->fd_file;
 330         struct scatterlist *sg = task->task_sg;
 331         struct iovec *iov;
 332         mm_segment_t old_fs;
 333         loff_t pos = (task->task_lba *
 334                       task->se_dev->se_sub_dev->se_dev_attrib.block_size);
 335         int ret, i = 0;
 336
 337         iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL);
 338         if (!iov) {
 339                 pr_err("Unable to allocate fd_do_writev iov[]\n");
 340                 return -ENOMEM;
 341         }
 342
 343         for (i = 0; i < task->task_sg_nents; i++) {
 344                 iov[i].iov_len = sg[i].length;
 345                 iov[i].iov_base = sg_virt(&sg[i]);
 346         }
 347
 348         old_fs = get_fs();
 349         set_fs(get_ds());
 350         ret = vfs_writev(fd, &iov[0], task->task_sg_nents, &pos);
 351         set_fs(old_fs);
 352
 353         kfree(iov);
 354
 355         if (ret < 0 || ret != task->task_size) {
 356                 pr_err("vfs_writev() returned %d\n", ret);
 357                 return (ret < 0 ? ret : -EINVAL);
 358         }
 359
 360         return 1;
 361 }
 362
 363 static void fd_emulate_sync_cache(struct se_task *task)
 364 {
 365         struct se_cmd *cmd = task->task_se_cmd;
 366         struct se_device *dev = cmd->se_dev;
 367         struct fd_dev *fd_dev = dev->dev_ptr;
 368         int immed = (cmd->t_task_cdb[1] & 0x2);
 369         loff_t start, end;
 370         int ret;
 371
 372         /*
 373          * If the Immediate bit is set, queue up the GOOD response
 374          * for this SYNCHRONIZE_CACHE op
 375          */
 376         if (immed)
 377                 transport_complete_sync_cache(cmd, 1);
 378
 379         /*
 380          * Determine if we will be flushing the entire device.
 381          */
 382         if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
 383                 start = 0;
 384                 end = LLONG_MAX;
 385         } else {
 386                 start = cmd->t_task_lba * dev->se_sub_dev->se_dev_attrib.block_size;
 387                 if (cmd->data_length)
 388                         end = start + cmd->data_length;
 389                 else
 390                         end = LLONG_MAX;
 391         }
 392
 393         ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
 394         if (ret != 0)
 395                 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
 396
 397         if (!immed)
 398                 transport_complete_sync_cache(cmd, ret == 0);
 399 }
 400
 401 /*
 402  * Tell TCM Core that we are capable of WriteCache emulation for
 403  * an underlying struct se_device.
 404  */
 405 static int fd_emulated_write_cache(struct se_device *dev)
 406 {
 407         return 1;
 408 }
 409
 410 static int fd_emulated_dpo(struct se_device *dev)
 411 {
 412         return 0;
 413 }
 414 /*
 415  * Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs
 416  * for TYPE_DISK.
 417  */
 418 static int fd_emulated_fua_write(struct se_device *dev)
 419 {
 420         return 1;
 421 }
 422
 423 static int fd_emulated_fua_read(struct se_device *dev)
 424 {
 425         return 0;
 426 }
 427
 428 /*
 429  * WRITE Force Unit Access (FUA) emulation on a per struct se_task
 430  * LBA range basis..
 431  */
 432 static void fd_emulate_write_fua(struct se_cmd *cmd, struct se_task *task)
 433 {
 434         struct se_device *dev = cmd->se_dev;
 435         struct fd_dev *fd_dev = dev->dev_ptr;
 436         loff_t start = task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size;
 437         loff_t end = start + task->task_size;
 438         int ret;
 439
 440         pr_debug("FILEIO: FUA WRITE LBA: %llu, bytes: %u\n",
 441                         task->task_lba, task->task_size);
 442
 443         ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
 444         if (ret != 0)
 445                 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
 446 }
 447
 448 static int fd_do_task(struct se_task *task)
 449 {
 450         struct se_cmd *cmd = task->task_se_cmd;
 451         struct se_device *dev = cmd->se_dev;
 452         int ret = 0;
 453
 454         /*
 455          * Call vectorized fileio functions to map struct scatterlist
 456          * physical memory addresses to struct iovec virtual memory.
 457          */
 458         if (task->task_data_direction == DMA_FROM_DEVICE) {
 459                 ret = fd_do_readv(task);
 460         } else {
 461                 ret = fd_do_writev(task);
 462
 463                 if (ret > 0 &&
 464                     dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0 &&
 465                     dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 &&
 466                     cmd->t_tasks_fua) {
 467                         /*
 468                          * We might need to be a bit smarter here
 469                          * and return some sense data to let the initiator
 470                          * know the FUA WRITE cache sync failed..?
 471                          */
 472                         fd_emulate_write_fua(cmd, task);
 473                 }
 474
 475         }
 476
 477         if (ret < 0)
 478                 return ret;
 479         if (ret) {
 480                 task->task_scsi_status = GOOD;
 481                 transport_complete_task(task, 1);
 482         }
 483         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
 484 }
 485
 486 /*      fd_free_task(): (Part of se_subsystem_api_t template)
 487  *
 488  *
 489  */
 490 static void fd_free_task(struct se_task *task)
 491 {
 492         struct fd_request *req = FILE_REQ(task);
 493
 494         kfree(req);
 495 }
 496
 497 enum {
 498         Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
 499 };
 500
 501 static match_table_t tokens = {
 502         {Opt_fd_dev_name, "fd_dev_name=%s"},
 503         {Opt_fd_dev_size, "fd_dev_size=%s"},
 504         {Opt_fd_buffered_io, "fd_buffered_io=%d"},
 505         {Opt_err, NULL}
 506 };
 507
 508 static ssize_t fd_set_configfs_dev_params(
 509         struct se_hba *hba,
 510         struct se_subsystem_dev *se_dev,
 511         const char *page, ssize_t count)
 512 {
 513         struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
 514         char *orig, *ptr, *arg_p, *opts;
 515         substring_t args[MAX_OPT_ARGS];
 516         int ret = 0, arg, token;
 517
 518         opts = kstrdup(page, GFP_KERNEL);
 519         if (!opts)
 520                 return -ENOMEM;
 521
 522         orig = opts;
 523
 524         while ((ptr = strsep(&opts, ",")) != NULL) {
 525                 if (!*ptr)
 526                         continue;
 527
 528                 token = match_token(ptr, tokens, args);
 529                 switch (token) {
 530                 case Opt_fd_dev_name:
 531                         arg_p = match_strdup(&args[0]);
 532                         if (!arg_p) {
 533                                 ret = -ENOMEM;
 534                                 break;
 535                         }
 536                         snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME,
 537                                         "%s", arg_p);
 538                         kfree(arg_p);
 539                         pr_debug("FILEIO: Referencing Path: %s\n",
 540                                         fd_dev->fd_dev_name);
 541                         fd_dev->fbd_flags |= FBDF_HAS_PATH;
 542                         break;
 543                 case Opt_fd_dev_size:
 544                         arg_p = match_strdup(&args[0]);
 545                         if (!arg_p) {
 546                                 ret = -ENOMEM;
 547                                 break;
 548                         }
 549                         ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size);
 550                         kfree(arg_p);
 551                         if (ret < 0) {
 552                                 pr_err("strict_strtoull() failed for"
 553                                                 " fd_dev_size=\n");
 554                                 goto out;
 555                         }
 556                         pr_debug("FILEIO: Referencing Size: %llu"
 557                                         " bytes\n", fd_dev->fd_dev_size);
 558                         fd_dev->fbd_flags |= FBDF_HAS_SIZE;
 559                         break;
 560                 case Opt_fd_buffered_io:
 561                         match_int(args, &arg);
 562                         if (arg != 1) {
 563                                 pr_err("bogus fd_buffered_io=%d value\n", arg);
 564                                 ret = -EINVAL;
 565                                 goto out;
 566                         }
 567
 568                         pr_debug("FILEIO: Using buffered I/O"
 569                                 " operations for struct fd_dev\n");
 570
 571                         fd_dev->fbd_flags |= FDBD_USE_BUFFERED_IO;
 572                         break;
 573                 default:
 574                         break;
 575                 }
 576         }
 577
 578 out:
 579         kfree(orig);
 580         return (!ret) ? count : ret;
 581 }
 582
 583 static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev)
 584 {
 585         struct fd_dev *fd_dev = (struct fd_dev *) se_dev->se_dev_su_ptr;
 586
 587         if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
 588                 pr_err("Missing fd_dev_name=\n");
 589                 return -EINVAL;
 590         }
 591
 592         return 0;
 593 }
 594
 595 static ssize_t fd_show_configfs_dev_params(
 596         struct se_hba *hba,
 597         struct se_subsystem_dev *se_dev,
 598         char *b)
 599 {
 600         struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
 601         ssize_t bl = 0;
 602
 603         bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
 604         bl += sprintf(b + bl, "        File: %s  Size: %llu  Mode: %s\n",
 605                 fd_dev->fd_dev_name, fd_dev->fd_dev_size,
 606                 (fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO) ?
 607                 "Buffered" : "Synchronous");
 608         return bl;
 609 }
 610
 611 /*      fd_get_cdb(): (Part of se_subsystem_api_t template)
 612  *
 613  *
 614  */
 615 static unsigned char *fd_get_cdb(struct se_task *task)
 616 {
 617         struct fd_request *req = FILE_REQ(task);
 618
 619         return req->fd_scsi_cdb;
 620 }
 621
 622 /*      fd_get_device_rev(): (Part of se_subsystem_api_t template)
 623  *
 624  *
 625  */
 626 static u32 fd_get_device_rev(struct se_device *dev)
 627 {
 628         return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
 629 }
 630
 631 /*      fd_get_device_type(): (Part of se_subsystem_api_t template)
 632  *
 633  *
 634  */
 635 static u32 fd_get_device_type(struct se_device *dev)
 636 {
 637         return TYPE_DISK;
 638 }
 639
 640 static sector_t fd_get_blocks(struct se_device *dev)
 641 {
 642         struct fd_dev *fd_dev = dev->dev_ptr;
 643         unsigned long long blocks_long = div_u64(fd_dev->fd_dev_size,
 644                         dev->se_sub_dev->se_dev_attrib.block_size);
 645
 646         return blocks_long;
 647 }
 648
 649 static struct se_subsystem_api fileio_template = {
 650         .name                   = "fileio",
 651         .owner                  = THIS_MODULE,
 652         .transport_type         = TRANSPORT_PLUGIN_VHBA_PDEV,
 653         .attach_hba             = fd_attach_hba,
 654         .detach_hba             = fd_detach_hba,
 655         .allocate_virtdevice    = fd_allocate_virtdevice,
 656         .create_virtdevice      = fd_create_virtdevice,
 657         .free_device            = fd_free_device,
 658         .dpo_emulated           = fd_emulated_dpo,
 659         .fua_write_emulated     = fd_emulated_fua_write,
 660         .fua_read_emulated      = fd_emulated_fua_read,
 661         .write_cache_emulated   = fd_emulated_write_cache,
 662         .alloc_task             = fd_alloc_task,
 663         .do_task                = fd_do_task,
 664         .do_sync_cache          = fd_emulate_sync_cache,
 665         .free_task              = fd_free_task,
 666         .check_configfs_dev_params = fd_check_configfs_dev_params,
 667         .set_configfs_dev_params = fd_set_configfs_dev_params,
 668         .show_configfs_dev_params = fd_show_configfs_dev_params,
 669         .get_cdb                = fd_get_cdb,
 670         .get_device_rev         = fd_get_device_rev,
 671         .get_device_type        = fd_get_device_type,
 672         .get_blocks             = fd_get_blocks,
 673 };
 674
 675 static int __init fileio_module_init(void)
 676 {
 677         return transport_subsystem_register(&fileio_template);
 678 }
 679
 680 static void fileio_module_exit(void)
 681 {
 682         transport_subsystem_release(&fileio_template);
 683 }
 684
 685 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
 686 MODULE_AUTHOR("nab@Linux-iSCSI.org");
 687 MODULE_LICENSE("GPL");
 688
 689 module_init(fileio_module_init);
 690 module_exit(fileio_module_exit);