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/string.h>
  30 #include <linux/parser.h>
  31 #include <linux/timer.h>
  32 #include <linux/blkdev.h>
  33 #include <linux/slab.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/module.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         /*
 138          * Use O_DSYNC by default instead of O_SYNC to forgo syncing
 139          * of pure timestamp updates.
 140          */
 141         flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
 142         /*
 143          * Optionally allow fd_buffered_io=1 to be enabled for people
 144          * who want use the fs buffer cache as an WriteCache mechanism.
 145          *
 146          * This means that in event of a hard failure, there is a risk
 147          * of silent data-loss if the SCSI client has *not* performed a
 148          * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE
 149          * to write-out the entire device cache.
 150          */
 151         if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
 152                 pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n");
 153                 flags &= ~O_DSYNC;
 154         }
 155
 156         file = filp_open(dev_p, flags, 0600);
 157         if (IS_ERR(file)) {
 158                 pr_err("filp_open(%s) failed\n", dev_p);
 159                 ret = PTR_ERR(file);
 160                 goto fail;
 161         }
 162         if (!file || !file->f_dentry) {
 163                 pr_err("filp_open(%s) failed\n", dev_p);
 164                 goto fail;
 165         }
 166         fd_dev->fd_file = file;
 167         /*
 168          * If using a block backend with this struct file, we extract
 169          * fd_dev->fd_[block,dev]_size from struct block_device.
 170          *
 171          * Otherwise, we use the passed fd_size= from configfs
 172          */
 173         inode = file->f_mapping->host;
 174         if (S_ISBLK(inode->i_mode)) {
 175                 struct request_queue *q;
 176                 unsigned long long dev_size;
 177                 /*
 178                  * Setup the local scope queue_limits from struct request_queue->limits
 179                  * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
 180                  */
 181                 q = bdev_get_queue(inode->i_bdev);
 182                 limits = &dev_limits.limits;
 183                 limits->logical_block_size = bdev_logical_block_size(inode->i_bdev);
 184                 limits->max_hw_sectors = queue_max_hw_sectors(q);
 185                 limits->max_sectors = queue_max_sectors(q);
 186                 /*
 187                  * Determine the number of bytes from i_size_read() minus
 188                  * one (1) logical sector from underlying struct block_device
 189                  */
 190                 fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
 191                 dev_size = (i_size_read(file->f_mapping->host) -
 192                                        fd_dev->fd_block_size);
 193
 194                 pr_debug("FILEIO: Using size: %llu bytes from struct"
 195                         " block_device blocks: %llu logical_block_size: %d\n",
 196                         dev_size, div_u64(dev_size, fd_dev->fd_block_size),
 197                         fd_dev->fd_block_size);
 198         } else {
 199                 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
 200                         pr_err("FILEIO: Missing fd_dev_size="
 201                                 " parameter, and no backing struct"
 202                                 " block_device\n");
 203                         goto fail;
 204                 }
 205
 206                 limits = &dev_limits.limits;
 207                 limits->logical_block_size = FD_BLOCKSIZE;
 208                 limits->max_hw_sectors = FD_MAX_SECTORS;
 209                 limits->max_sectors = FD_MAX_SECTORS;
 210                 fd_dev->fd_block_size = FD_BLOCKSIZE;
 211         }
 212
 213         dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
 214         dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH;
 215
 216         dev = transport_add_device_to_core_hba(hba, &fileio_template,
 217                                 se_dev, dev_flags, fd_dev,
 218                                 &dev_limits, "FILEIO", FD_VERSION);
 219         if (!dev)
 220                 goto fail;
 221
 222         if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
 223                 pr_debug("FILEIO: Forcing setting of emulate_write_cache=1"
 224                         " with FDBD_HAS_BUFFERED_IO_WCE\n");
 225                 dev->se_sub_dev->se_dev_attrib.emulate_write_cache = 1;
 226         }
 227
 228         fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
 229         fd_dev->fd_queue_depth = dev->queue_depth;
 230
 231         pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
 232                 " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
 233                         fd_dev->fd_dev_name, fd_dev->fd_dev_size);
 234
 235         putname(dev_p);
 236         return dev;
 237 fail:
 238         if (fd_dev->fd_file) {
 239                 filp_close(fd_dev->fd_file, NULL);
 240                 fd_dev->fd_file = NULL;
 241         }
 242         putname(dev_p);
 243         return ERR_PTR(ret);
 244 }
 245
 246 /*      fd_free_device(): (Part of se_subsystem_api_t template)
 247  *
 248  *
 249  */
 250 static void fd_free_device(void *p)
 251 {
 252         struct fd_dev *fd_dev = (struct fd_dev *) p;
 253
 254         if (fd_dev->fd_file) {
 255                 filp_close(fd_dev->fd_file, NULL);
 256                 fd_dev->fd_file = NULL;
 257         }
 258
 259         kfree(fd_dev);
 260 }
 261
 262 static inline struct fd_request *FILE_REQ(struct se_task *task)
 263 {
 264         return container_of(task, struct fd_request, fd_task);
 265 }
 266
 267
 268 static struct se_task *
 269 fd_alloc_task(unsigned char *cdb)
 270 {
 271         struct fd_request *fd_req;
 272
 273         fd_req = kzalloc(sizeof(struct fd_request), GFP_KERNEL);
 274         if (!fd_req) {
 275                 pr_err("Unable to allocate struct fd_request\n");
 276                 return NULL;
 277         }
 278
 279         return &fd_req->fd_task;
 280 }
 281
 282 static int fd_do_readv(struct se_task *task)
 283 {
 284         struct fd_request *req = FILE_REQ(task);
 285         struct se_device *se_dev = req->fd_task.task_se_cmd->se_dev;
 286         struct fd_dev *dev = se_dev->dev_ptr;
 287         struct file *fd = dev->fd_file;
 288         struct scatterlist *sg = task->task_sg;
 289         struct iovec *iov;
 290         mm_segment_t old_fs;
 291         loff_t pos = (task->task_lba *
 292                       se_dev->se_sub_dev->se_dev_attrib.block_size);
 293         int ret = 0, i;
 294
 295         iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL);
 296         if (!iov) {
 297                 pr_err("Unable to allocate fd_do_readv iov[]\n");
 298                 return -ENOMEM;
 299         }
 300
 301         for_each_sg(task->task_sg, sg, task->task_sg_nents, i) {
 302                 iov[i].iov_len = sg->length;
 303                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset;
 304         }
 305
 306         old_fs = get_fs();
 307         set_fs(get_ds());
 308         ret = vfs_readv(fd, &iov[0], task->task_sg_nents, &pos);
 309         set_fs(old_fs);
 310
 311         for_each_sg(task->task_sg, sg, task->task_sg_nents, i)
 312                 kunmap(sg_page(sg));
 313         kfree(iov);
 314         /*
 315          * Return zeros and GOOD status even if the READ did not return
 316          * the expected virt_size for struct file w/o a backing struct
 317          * block_device.
 318          */
 319         if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) {
 320                 if (ret < 0 || ret != task->task_size) {
 321                         pr_err("vfs_readv() returned %d,"
 322                                 " expecting %d for S_ISBLK\n", ret,
 323                                 (int)task->task_size);
 324                         return (ret < 0 ? ret : -EINVAL);
 325                 }
 326         } else {
 327                 if (ret < 0) {
 328                         pr_err("vfs_readv() returned %d for non"
 329                                 " S_ISBLK\n", ret);
 330                         return ret;
 331                 }
 332         }
 333
 334         return 1;
 335 }
 336
 337 static int fd_do_writev(struct se_task *task)
 338 {
 339         struct fd_request *req = FILE_REQ(task);
 340         struct se_device *se_dev = req->fd_task.task_se_cmd->se_dev;
 341         struct fd_dev *dev = se_dev->dev_ptr;
 342         struct file *fd = dev->fd_file;
 343         struct scatterlist *sg = task->task_sg;
 344         struct iovec *iov;
 345         mm_segment_t old_fs;
 346         loff_t pos = (task->task_lba *
 347                       se_dev->se_sub_dev->se_dev_attrib.block_size);
 348         int ret, i = 0;
 349
 350         iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL);
 351         if (!iov) {
 352                 pr_err("Unable to allocate fd_do_writev iov[]\n");
 353                 return -ENOMEM;
 354         }
 355
 356         for_each_sg(task->task_sg, sg, task->task_sg_nents, i) {
 357                 iov[i].iov_len = sg->length;
 358                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset;
 359         }
 360
 361         old_fs = get_fs();
 362         set_fs(get_ds());
 363         ret = vfs_writev(fd, &iov[0], task->task_sg_nents, &pos);
 364         set_fs(old_fs);
 365
 366         for_each_sg(task->task_sg, sg, task->task_sg_nents, i)
 367                 kunmap(sg_page(sg));
 368
 369         kfree(iov);
 370
 371         if (ret < 0 || ret != task->task_size) {
 372                 pr_err("vfs_writev() returned %d\n", ret);
 373                 return (ret < 0 ? ret : -EINVAL);
 374         }
 375
 376         return 1;
 377 }
 378
 379 static void fd_emulate_sync_cache(struct se_task *task)
 380 {
 381         struct se_cmd *cmd = task->task_se_cmd;
 382         struct se_device *dev = cmd->se_dev;
 383         struct fd_dev *fd_dev = dev->dev_ptr;
 384         int immed = (cmd->t_task_cdb[1] & 0x2);
 385         loff_t start, end;
 386         int ret;
 387
 388         /*
 389          * If the Immediate bit is set, queue up the GOOD response
 390          * for this SYNCHRONIZE_CACHE op
 391          */
 392         if (immed)
 393                 transport_complete_sync_cache(cmd, 1);
 394
 395         /*
 396          * Determine if we will be flushing the entire device.
 397          */
 398         if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
 399                 start = 0;
 400                 end = LLONG_MAX;
 401         } else {
 402                 start = cmd->t_task_lba * dev->se_sub_dev->se_dev_attrib.block_size;
 403                 if (cmd->data_length)
 404                         end = start + cmd->data_length;
 405                 else
 406                         end = LLONG_MAX;
 407         }
 408
 409         ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
 410         if (ret != 0)
 411                 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
 412
 413         if (!immed)
 414                 transport_complete_sync_cache(cmd, ret == 0);
 415 }
 416
 417 static int fd_do_task(struct se_task *task)
 418 {
 419         struct se_cmd *cmd = task->task_se_cmd;
 420         struct se_device *dev = cmd->se_dev;
 421         int ret = 0;
 422
 423         /*
 424          * Call vectorized fileio functions to map struct scatterlist
 425          * physical memory addresses to struct iovec virtual memory.
 426          */
 427         if (task->task_data_direction == DMA_FROM_DEVICE) {
 428                 ret = fd_do_readv(task);
 429         } else {
 430                 ret = fd_do_writev(task);
 431                 /*
 432                  * Perform implict vfs_fsync_range() for fd_do_writev() ops
 433                  * for SCSI WRITEs with Forced Unit Access (FUA) set.
 434                  * Allow this to happen independent of WCE=0 setting.
 435                  */
 436                 if (ret > 0 &&
 437                     dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 &&
 438                     (cmd->se_cmd_flags & SCF_FUA)) {
 439                         struct fd_dev *fd_dev = dev->dev_ptr;
 440                         loff_t start = task->task_lba *
 441                                 dev->se_sub_dev->se_dev_attrib.block_size;
 442                         loff_t end = start + task->task_size;
 443
 444                         vfs_fsync_range(fd_dev->fd_file, start, end, 1);
 445                 }
 446         }
 447
 448         if (ret < 0) {
 449                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 450                 return ret;
 451         }
 452         if (ret) {
 453                 task->task_scsi_status = GOOD;
 454                 transport_complete_task(task, 1);
 455         }
 456         return 0;
 457 }
 458
 459 /*      fd_free_task(): (Part of se_subsystem_api_t template)
 460  *
 461  *
 462  */
 463 static void fd_free_task(struct se_task *task)
 464 {
 465         struct fd_request *req = FILE_REQ(task);
 466
 467         kfree(req);
 468 }
 469
 470 enum {
 471         Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
 472 };
 473
 474 static match_table_t tokens = {
 475         {Opt_fd_dev_name, "fd_dev_name=%s"},
 476         {Opt_fd_dev_size, "fd_dev_size=%s"},
 477         {Opt_fd_buffered_io, "fd_buffered_io=%d"},
 478         {Opt_err, NULL}
 479 };
 480
 481 static ssize_t fd_set_configfs_dev_params(
 482         struct se_hba *hba,
 483         struct se_subsystem_dev *se_dev,
 484         const char *page, ssize_t count)
 485 {
 486         struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
 487         char *orig, *ptr, *arg_p, *opts;
 488         substring_t args[MAX_OPT_ARGS];
 489         int ret = 0, arg, token;
 490
 491         opts = kstrdup(page, GFP_KERNEL);
 492         if (!opts)
 493                 return -ENOMEM;
 494
 495         orig = opts;
 496
 497         while ((ptr = strsep(&opts, ",")) != NULL) {
 498                 if (!*ptr)
 499                         continue;
 500
 501                 token = match_token(ptr, tokens, args);
 502                 switch (token) {
 503                 case Opt_fd_dev_name:
 504                         arg_p = match_strdup(&args[0]);
 505                         if (!arg_p) {
 506                                 ret = -ENOMEM;
 507                                 break;
 508                         }
 509                         snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME,
 510                                         "%s", arg_p);
 511                         kfree(arg_p);
 512                         pr_debug("FILEIO: Referencing Path: %s\n",
 513                                         fd_dev->fd_dev_name);
 514                         fd_dev->fbd_flags |= FBDF_HAS_PATH;
 515                         break;
 516                 case Opt_fd_dev_size:
 517                         arg_p = match_strdup(&args[0]);
 518                         if (!arg_p) {
 519                                 ret = -ENOMEM;
 520                                 break;
 521                         }
 522                         ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size);
 523                         kfree(arg_p);
 524                         if (ret < 0) {
 525                                 pr_err("strict_strtoull() failed for"
 526                                                 " fd_dev_size=\n");
 527                                 goto out;
 528                         }
 529                         pr_debug("FILEIO: Referencing Size: %llu"
 530                                         " bytes\n", fd_dev->fd_dev_size);
 531                         fd_dev->fbd_flags |= FBDF_HAS_SIZE;
 532                         break;
 533                 case Opt_fd_buffered_io:
 534                         match_int(args, &arg);
 535                         if (arg != 1) {
 536                                 pr_err("bogus fd_buffered_io=%d value\n", arg);
 537                                 ret = -EINVAL;
 538                                 goto out;
 539                         }
 540
 541                         pr_debug("FILEIO: Using buffered I/O"
 542                                 " operations for struct fd_dev\n");
 543
 544                         fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE;
 545                         break;
 546                 default:
 547                         break;
 548                 }
 549         }
 550
 551 out:
 552         kfree(orig);
 553         return (!ret) ? count : ret;
 554 }
 555
 556 static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev)
 557 {
 558         struct fd_dev *fd_dev = (struct fd_dev *) se_dev->se_dev_su_ptr;
 559
 560         if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
 561                 pr_err("Missing fd_dev_name=\n");
 562                 return -EINVAL;
 563         }
 564
 565         return 0;
 566 }
 567
 568 static ssize_t fd_show_configfs_dev_params(
 569         struct se_hba *hba,
 570         struct se_subsystem_dev *se_dev,
 571         char *b)
 572 {
 573         struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
 574         ssize_t bl = 0;
 575
 576         bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
 577         bl += sprintf(b + bl, "        File: %s  Size: %llu  Mode: %s\n",
 578                 fd_dev->fd_dev_name, fd_dev->fd_dev_size,
 579                 (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ?
 580                 "Buffered-WCE" : "O_DSYNC");
 581         return bl;
 582 }
 583
 584 /*      fd_get_device_rev(): (Part of se_subsystem_api_t template)
 585  *
 586  *
 587  */
 588 static u32 fd_get_device_rev(struct se_device *dev)
 589 {
 590         return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
 591 }
 592
 593 /*      fd_get_device_type(): (Part of se_subsystem_api_t template)
 594  *
 595  *
 596  */
 597 static u32 fd_get_device_type(struct se_device *dev)
 598 {
 599         return TYPE_DISK;
 600 }
 601
 602 static sector_t fd_get_blocks(struct se_device *dev)
 603 {
 604         struct fd_dev *fd_dev = dev->dev_ptr;
 605         struct file *f = fd_dev->fd_file;
 606         struct inode *i = f->f_mapping->host;
 607         unsigned long long dev_size;
 608         /*
 609          * When using a file that references an underlying struct block_device,
 610          * ensure dev_size is always based on the current inode size in order
 611          * to handle underlying block_device resize operations.
 612          */
 613         if (S_ISBLK(i->i_mode))
 614                 dev_size = (i_size_read(i) - fd_dev->fd_block_size);
 615         else
 616                 dev_size = fd_dev->fd_dev_size;
 617
 618         return div_u64(dev_size, dev->se_sub_dev->se_dev_attrib.block_size);
 619 }
 620
 621 static struct se_subsystem_api fileio_template = {
 622         .name                   = "fileio",
 623         .owner                  = THIS_MODULE,
 624         .transport_type         = TRANSPORT_PLUGIN_VHBA_PDEV,
 625         .write_cache_emulated   = 1,
 626         .fua_write_emulated     = 1,
 627         .attach_hba             = fd_attach_hba,
 628         .detach_hba             = fd_detach_hba,
 629         .allocate_virtdevice    = fd_allocate_virtdevice,
 630         .create_virtdevice      = fd_create_virtdevice,
 631         .free_device            = fd_free_device,
 632         .alloc_task             = fd_alloc_task,
 633         .do_task                = fd_do_task,
 634         .do_sync_cache          = fd_emulate_sync_cache,
 635         .free_task              = fd_free_task,
 636         .check_configfs_dev_params = fd_check_configfs_dev_params,
 637         .set_configfs_dev_params = fd_set_configfs_dev_params,
 638         .show_configfs_dev_params = fd_show_configfs_dev_params,
 639         .get_device_rev         = fd_get_device_rev,
 640         .get_device_type        = fd_get_device_type,
 641         .get_blocks             = fd_get_blocks,
 642 };
 643
 644 static int __init fileio_module_init(void)
 645 {
 646         return transport_subsystem_register(&fileio_template);
 647 }
 648
 649 static void fileio_module_exit(void)
 650 {
 651         transport_subsystem_release(&fileio_template);
 652 }
 653
 654 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
 655 MODULE_AUTHOR("nab@Linux-iSCSI.org");
 656 MODULE_LICENSE("GPL");
 657
 658 module_init(fileio_module_init);
 659 module_exit(fileio_module_exit);