[SCSI] target: Convert backend ->create_virtdevice() call to return ERR_PTR
[linux-3.10.git] / 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_id=%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);