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Commit | Line | Data |
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c66ac9db NB |
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> | |
c66ac9db NB |
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"); | |
e3d6f909 | 70 | return -ENOMEM; |
c66ac9db NB |
71 | } |
72 | ||
73 | fd_host->fd_host_id = host_id; | |
74 | ||
e3d6f909 | 75 | hba->hba_ptr = fd_host; |
c66ac9db NB |
76 | |
77 | printk(KERN_INFO "CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" | |
78 | " Target Core Stack %s\n", hba->hba_id, FD_VERSION, | |
79 | TARGET_CORE_MOD_VERSION); | |
80 | printk(KERN_INFO "CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" | |
e3d6f909 AG |
81 | " MaxSectors: %u\n", |
82 | hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS); | |
c66ac9db NB |
83 | |
84 | return 0; | |
85 | } | |
86 | ||
87 | static void fd_detach_hba(struct se_hba *hba) | |
88 | { | |
89 | struct fd_host *fd_host = hba->hba_ptr; | |
90 | ||
91 | printk(KERN_INFO "CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" | |
92 | " Target Core\n", hba->hba_id, fd_host->fd_host_id); | |
93 | ||
94 | kfree(fd_host); | |
95 | hba->hba_ptr = NULL; | |
96 | } | |
97 | ||
98 | static void *fd_allocate_virtdevice(struct se_hba *hba, const char *name) | |
99 | { | |
100 | struct fd_dev *fd_dev; | |
101 | struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr; | |
102 | ||
103 | fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); | |
104 | if (!(fd_dev)) { | |
105 | printk(KERN_ERR "Unable to allocate memory for struct fd_dev\n"); | |
106 | return NULL; | |
107 | } | |
108 | ||
109 | fd_dev->fd_host = fd_host; | |
110 | ||
111 | printk(KERN_INFO "FILEIO: Allocated fd_dev for %p\n", name); | |
112 | ||
113 | return fd_dev; | |
114 | } | |
115 | ||
116 | /* fd_create_virtdevice(): (Part of se_subsystem_api_t template) | |
117 | * | |
118 | * | |
119 | */ | |
120 | static struct se_device *fd_create_virtdevice( | |
121 | struct se_hba *hba, | |
122 | struct se_subsystem_dev *se_dev, | |
123 | void *p) | |
124 | { | |
125 | char *dev_p = NULL; | |
126 | struct se_device *dev; | |
127 | struct se_dev_limits dev_limits; | |
128 | struct queue_limits *limits; | |
129 | struct fd_dev *fd_dev = (struct fd_dev *) p; | |
130 | struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr; | |
131 | mm_segment_t old_fs; | |
132 | struct file *file; | |
133 | struct inode *inode = NULL; | |
613640e4 | 134 | int dev_flags = 0, flags, ret = -EINVAL; |
c66ac9db NB |
135 | |
136 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
137 | ||
138 | old_fs = get_fs(); | |
139 | set_fs(get_ds()); | |
140 | dev_p = getname(fd_dev->fd_dev_name); | |
141 | set_fs(old_fs); | |
142 | ||
143 | if (IS_ERR(dev_p)) { | |
144 | printk(KERN_ERR "getname(%s) failed: %lu\n", | |
145 | fd_dev->fd_dev_name, IS_ERR(dev_p)); | |
613640e4 | 146 | ret = PTR_ERR(dev_p); |
c66ac9db NB |
147 | goto fail; |
148 | } | |
149 | #if 0 | |
150 | if (di->no_create_file) | |
151 | flags = O_RDWR | O_LARGEFILE; | |
152 | else | |
153 | flags = O_RDWR | O_CREAT | O_LARGEFILE; | |
154 | #else | |
155 | flags = O_RDWR | O_CREAT | O_LARGEFILE; | |
156 | #endif | |
157 | /* flags |= O_DIRECT; */ | |
158 | /* | |
25985edc | 159 | * If fd_buffered_io=1 has not been set explicitly (the default), |
c66ac9db NB |
160 | * use O_SYNC to force FILEIO writes to disk. |
161 | */ | |
162 | if (!(fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO)) | |
163 | flags |= O_SYNC; | |
164 | ||
165 | file = filp_open(dev_p, flags, 0600); | |
613640e4 NB |
166 | if (IS_ERR(file)) { |
167 | printk(KERN_ERR "filp_open(%s) failed\n", dev_p); | |
168 | ret = PTR_ERR(file); | |
169 | goto fail; | |
170 | } | |
171 | if (!file || !file->f_dentry) { | |
c66ac9db NB |
172 | printk(KERN_ERR "filp_open(%s) failed\n", dev_p); |
173 | goto fail; | |
174 | } | |
175 | fd_dev->fd_file = file; | |
176 | /* | |
177 | * If using a block backend with this struct file, we extract | |
178 | * fd_dev->fd_[block,dev]_size from struct block_device. | |
179 | * | |
180 | * Otherwise, we use the passed fd_size= from configfs | |
181 | */ | |
182 | inode = file->f_mapping->host; | |
183 | if (S_ISBLK(inode->i_mode)) { | |
184 | struct request_queue *q; | |
185 | /* | |
186 | * Setup the local scope queue_limits from struct request_queue->limits | |
187 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. | |
188 | */ | |
189 | q = bdev_get_queue(inode->i_bdev); | |
190 | limits = &dev_limits.limits; | |
191 | limits->logical_block_size = bdev_logical_block_size(inode->i_bdev); | |
192 | limits->max_hw_sectors = queue_max_hw_sectors(q); | |
193 | limits->max_sectors = queue_max_sectors(q); | |
194 | /* | |
195 | * Determine the number of bytes from i_size_read() minus | |
196 | * one (1) logical sector from underlying struct block_device | |
197 | */ | |
198 | fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); | |
199 | fd_dev->fd_dev_size = (i_size_read(file->f_mapping->host) - | |
200 | fd_dev->fd_block_size); | |
201 | ||
202 | printk(KERN_INFO "FILEIO: Using size: %llu bytes from struct" | |
203 | " block_device blocks: %llu logical_block_size: %d\n", | |
204 | fd_dev->fd_dev_size, | |
205 | div_u64(fd_dev->fd_dev_size, fd_dev->fd_block_size), | |
206 | fd_dev->fd_block_size); | |
207 | } else { | |
208 | if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { | |
209 | printk(KERN_ERR "FILEIO: Missing fd_dev_size=" | |
210 | " parameter, and no backing struct" | |
211 | " block_device\n"); | |
212 | goto fail; | |
213 | } | |
214 | ||
215 | limits = &dev_limits.limits; | |
216 | limits->logical_block_size = FD_BLOCKSIZE; | |
217 | limits->max_hw_sectors = FD_MAX_SECTORS; | |
218 | limits->max_sectors = FD_MAX_SECTORS; | |
219 | fd_dev->fd_block_size = FD_BLOCKSIZE; | |
220 | } | |
221 | ||
222 | dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; | |
223 | dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH; | |
224 | ||
225 | dev = transport_add_device_to_core_hba(hba, &fileio_template, | |
5951146d | 226 | se_dev, dev_flags, fd_dev, |
c66ac9db NB |
227 | &dev_limits, "FILEIO", FD_VERSION); |
228 | if (!(dev)) | |
229 | goto fail; | |
230 | ||
231 | fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; | |
232 | fd_dev->fd_queue_depth = dev->queue_depth; | |
233 | ||
234 | printk(KERN_INFO "CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," | |
235 | " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, | |
236 | fd_dev->fd_dev_name, fd_dev->fd_dev_size); | |
237 | ||
238 | putname(dev_p); | |
239 | return dev; | |
240 | fail: | |
241 | if (fd_dev->fd_file) { | |
242 | filp_close(fd_dev->fd_file, NULL); | |
243 | fd_dev->fd_file = NULL; | |
244 | } | |
245 | putname(dev_p); | |
613640e4 | 246 | return ERR_PTR(ret); |
c66ac9db NB |
247 | } |
248 | ||
249 | /* fd_free_device(): (Part of se_subsystem_api_t template) | |
250 | * | |
251 | * | |
252 | */ | |
253 | static void fd_free_device(void *p) | |
254 | { | |
255 | struct fd_dev *fd_dev = (struct fd_dev *) p; | |
256 | ||
257 | if (fd_dev->fd_file) { | |
258 | filp_close(fd_dev->fd_file, NULL); | |
259 | fd_dev->fd_file = NULL; | |
260 | } | |
261 | ||
262 | kfree(fd_dev); | |
263 | } | |
264 | ||
265 | static inline struct fd_request *FILE_REQ(struct se_task *task) | |
266 | { | |
267 | return container_of(task, struct fd_request, fd_task); | |
268 | } | |
269 | ||
270 | ||
271 | static struct se_task * | |
272 | fd_alloc_task(struct se_cmd *cmd) | |
273 | { | |
274 | struct fd_request *fd_req; | |
275 | ||
276 | fd_req = kzalloc(sizeof(struct fd_request), GFP_KERNEL); | |
277 | if (!(fd_req)) { | |
278 | printk(KERN_ERR "Unable to allocate struct fd_request\n"); | |
279 | return NULL; | |
280 | } | |
281 | ||
5951146d | 282 | fd_req->fd_dev = cmd->se_dev->dev_ptr; |
c66ac9db NB |
283 | |
284 | return &fd_req->fd_task; | |
285 | } | |
286 | ||
287 | static int fd_do_readv(struct se_task *task) | |
288 | { | |
289 | struct fd_request *req = FILE_REQ(task); | |
290 | struct file *fd = req->fd_dev->fd_file; | |
291 | struct scatterlist *sg = task->task_sg; | |
292 | struct iovec *iov; | |
293 | mm_segment_t old_fs; | |
e3d6f909 AG |
294 | loff_t pos = (task->task_lba * |
295 | task->se_dev->se_sub_dev->se_dev_attrib.block_size); | |
c66ac9db NB |
296 | int ret = 0, i; |
297 | ||
298 | iov = kzalloc(sizeof(struct iovec) * task->task_sg_num, GFP_KERNEL); | |
299 | if (!(iov)) { | |
300 | printk(KERN_ERR "Unable to allocate fd_do_readv iov[]\n"); | |
e3d6f909 | 301 | return -ENOMEM; |
c66ac9db NB |
302 | } |
303 | ||
304 | for (i = 0; i < task->task_sg_num; i++) { | |
305 | iov[i].iov_len = sg[i].length; | |
306 | iov[i].iov_base = sg_virt(&sg[i]); | |
307 | } | |
308 | ||
309 | old_fs = get_fs(); | |
310 | set_fs(get_ds()); | |
311 | ret = vfs_readv(fd, &iov[0], task->task_sg_num, &pos); | |
312 | set_fs(old_fs); | |
313 | ||
314 | kfree(iov); | |
315 | /* | |
316 | * Return zeros and GOOD status even if the READ did not return | |
317 | * the expected virt_size for struct file w/o a backing struct | |
318 | * block_device. | |
319 | */ | |
320 | if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { | |
321 | if (ret < 0 || ret != task->task_size) { | |
322 | printk(KERN_ERR "vfs_readv() returned %d," | |
323 | " expecting %d for S_ISBLK\n", ret, | |
324 | (int)task->task_size); | |
e3d6f909 | 325 | return (ret < 0 ? ret : -EINVAL); |
c66ac9db NB |
326 | } |
327 | } else { | |
328 | if (ret < 0) { | |
329 | printk(KERN_ERR "vfs_readv() returned %d for non" | |
330 | " S_ISBLK\n", ret); | |
e3d6f909 | 331 | return ret; |
c66ac9db NB |
332 | } |
333 | } | |
334 | ||
335 | return 1; | |
336 | } | |
337 | ||
338 | static int fd_do_writev(struct se_task *task) | |
339 | { | |
340 | struct fd_request *req = FILE_REQ(task); | |
341 | struct file *fd = req->fd_dev->fd_file; | |
342 | struct scatterlist *sg = task->task_sg; | |
343 | struct iovec *iov; | |
344 | mm_segment_t old_fs; | |
e3d6f909 AG |
345 | loff_t pos = (task->task_lba * |
346 | task->se_dev->se_sub_dev->se_dev_attrib.block_size); | |
c66ac9db NB |
347 | int ret, i = 0; |
348 | ||
349 | iov = kzalloc(sizeof(struct iovec) * task->task_sg_num, GFP_KERNEL); | |
350 | if (!(iov)) { | |
351 | printk(KERN_ERR "Unable to allocate fd_do_writev iov[]\n"); | |
e3d6f909 | 352 | return -ENOMEM; |
c66ac9db NB |
353 | } |
354 | ||
355 | for (i = 0; i < task->task_sg_num; i++) { | |
356 | iov[i].iov_len = sg[i].length; | |
357 | iov[i].iov_base = sg_virt(&sg[i]); | |
358 | } | |
359 | ||
360 | old_fs = get_fs(); | |
361 | set_fs(get_ds()); | |
362 | ret = vfs_writev(fd, &iov[0], task->task_sg_num, &pos); | |
363 | set_fs(old_fs); | |
364 | ||
365 | kfree(iov); | |
366 | ||
367 | if (ret < 0 || ret != task->task_size) { | |
368 | printk(KERN_ERR "vfs_writev() returned %d\n", ret); | |
e3d6f909 | 369 | return (ret < 0 ? ret : -EINVAL); |
c66ac9db NB |
370 | } |
371 | ||
372 | return 1; | |
373 | } | |
374 | ||
375 | static void fd_emulate_sync_cache(struct se_task *task) | |
376 | { | |
e3d6f909 | 377 | struct se_cmd *cmd = task->task_se_cmd; |
c66ac9db NB |
378 | struct se_device *dev = cmd->se_dev; |
379 | struct fd_dev *fd_dev = dev->dev_ptr; | |
5951146d | 380 | int immed = (cmd->t_task.t_task_cdb[1] & 0x2); |
c66ac9db NB |
381 | loff_t start, end; |
382 | int ret; | |
383 | ||
384 | /* | |
385 | * If the Immediate bit is set, queue up the GOOD response | |
386 | * for this SYNCHRONIZE_CACHE op | |
387 | */ | |
388 | if (immed) | |
389 | transport_complete_sync_cache(cmd, 1); | |
390 | ||
391 | /* | |
392 | * Determine if we will be flushing the entire device. | |
393 | */ | |
5951146d | 394 | if (cmd->t_task.t_task_lba == 0 && cmd->data_length == 0) { |
c66ac9db NB |
395 | start = 0; |
396 | end = LLONG_MAX; | |
397 | } else { | |
5951146d | 398 | start = cmd->t_task.t_task_lba * dev->se_sub_dev->se_dev_attrib.block_size; |
c66ac9db NB |
399 | if (cmd->data_length) |
400 | end = start + cmd->data_length; | |
401 | else | |
402 | end = LLONG_MAX; | |
403 | } | |
404 | ||
405 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); | |
406 | if (ret != 0) | |
407 | printk(KERN_ERR "FILEIO: vfs_fsync_range() failed: %d\n", ret); | |
408 | ||
409 | if (!immed) | |
410 | transport_complete_sync_cache(cmd, ret == 0); | |
411 | } | |
412 | ||
413 | /* | |
414 | * Tell TCM Core that we are capable of WriteCache emulation for | |
415 | * an underlying struct se_device. | |
416 | */ | |
417 | static int fd_emulated_write_cache(struct se_device *dev) | |
418 | { | |
419 | return 1; | |
420 | } | |
421 | ||
422 | static int fd_emulated_dpo(struct se_device *dev) | |
423 | { | |
424 | return 0; | |
425 | } | |
426 | /* | |
427 | * Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs | |
428 | * for TYPE_DISK. | |
429 | */ | |
430 | static int fd_emulated_fua_write(struct se_device *dev) | |
431 | { | |
432 | return 1; | |
433 | } | |
434 | ||
435 | static int fd_emulated_fua_read(struct se_device *dev) | |
436 | { | |
437 | return 0; | |
438 | } | |
439 | ||
440 | /* | |
441 | * WRITE Force Unit Access (FUA) emulation on a per struct se_task | |
442 | * LBA range basis.. | |
443 | */ | |
444 | static void fd_emulate_write_fua(struct se_cmd *cmd, struct se_task *task) | |
445 | { | |
446 | struct se_device *dev = cmd->se_dev; | |
447 | struct fd_dev *fd_dev = dev->dev_ptr; | |
e3d6f909 | 448 | loff_t start = task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size; |
c66ac9db NB |
449 | loff_t end = start + task->task_size; |
450 | int ret; | |
451 | ||
452 | DEBUG_FD_CACHE("FILEIO: FUA WRITE LBA: %llu, bytes: %u\n", | |
453 | task->task_lba, task->task_size); | |
454 | ||
455 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); | |
456 | if (ret != 0) | |
457 | printk(KERN_ERR "FILEIO: vfs_fsync_range() failed: %d\n", ret); | |
458 | } | |
459 | ||
460 | static int fd_do_task(struct se_task *task) | |
461 | { | |
462 | struct se_cmd *cmd = task->task_se_cmd; | |
463 | struct se_device *dev = cmd->se_dev; | |
464 | int ret = 0; | |
465 | ||
466 | /* | |
467 | * Call vectorized fileio functions to map struct scatterlist | |
468 | * physical memory addresses to struct iovec virtual memory. | |
469 | */ | |
470 | if (task->task_data_direction == DMA_FROM_DEVICE) { | |
471 | ret = fd_do_readv(task); | |
472 | } else { | |
473 | ret = fd_do_writev(task); | |
474 | ||
475 | if (ret > 0 && | |
e3d6f909 AG |
476 | dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0 && |
477 | dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && | |
5951146d | 478 | cmd->t_task.t_tasks_fua) { |
c66ac9db NB |
479 | /* |
480 | * We might need to be a bit smarter here | |
481 | * and return some sense data to let the initiator | |
482 | * know the FUA WRITE cache sync failed..? | |
483 | */ | |
484 | fd_emulate_write_fua(cmd, task); | |
485 | } | |
486 | ||
487 | } | |
488 | ||
489 | if (ret < 0) | |
490 | return ret; | |
491 | if (ret) { | |
492 | task->task_scsi_status = GOOD; | |
493 | transport_complete_task(task, 1); | |
494 | } | |
495 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; | |
496 | } | |
497 | ||
498 | /* fd_free_task(): (Part of se_subsystem_api_t template) | |
499 | * | |
500 | * | |
501 | */ | |
502 | static void fd_free_task(struct se_task *task) | |
503 | { | |
504 | struct fd_request *req = FILE_REQ(task); | |
505 | ||
506 | kfree(req); | |
507 | } | |
508 | ||
509 | enum { | |
510 | Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err | |
511 | }; | |
512 | ||
513 | static match_table_t tokens = { | |
514 | {Opt_fd_dev_name, "fd_dev_name=%s"}, | |
515 | {Opt_fd_dev_size, "fd_dev_size=%s"}, | |
58c3e647 | 516 | {Opt_fd_buffered_io, "fd_buffered_io=%d"}, |
c66ac9db NB |
517 | {Opt_err, NULL} |
518 | }; | |
519 | ||
520 | static ssize_t fd_set_configfs_dev_params( | |
521 | struct se_hba *hba, | |
522 | struct se_subsystem_dev *se_dev, | |
523 | const char *page, ssize_t count) | |
524 | { | |
525 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; | |
526 | char *orig, *ptr, *arg_p, *opts; | |
527 | substring_t args[MAX_OPT_ARGS]; | |
528 | int ret = 0, arg, token; | |
529 | ||
530 | opts = kstrdup(page, GFP_KERNEL); | |
531 | if (!opts) | |
532 | return -ENOMEM; | |
533 | ||
534 | orig = opts; | |
535 | ||
536 | while ((ptr = strsep(&opts, ",")) != NULL) { | |
537 | if (!*ptr) | |
538 | continue; | |
539 | ||
540 | token = match_token(ptr, tokens, args); | |
541 | switch (token) { | |
542 | case Opt_fd_dev_name: | |
6d180253 JJ |
543 | arg_p = match_strdup(&args[0]); |
544 | if (!arg_p) { | |
545 | ret = -ENOMEM; | |
546 | break; | |
547 | } | |
c66ac9db | 548 | snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME, |
6d180253 JJ |
549 | "%s", arg_p); |
550 | kfree(arg_p); | |
c66ac9db NB |
551 | printk(KERN_INFO "FILEIO: Referencing Path: %s\n", |
552 | fd_dev->fd_dev_name); | |
553 | fd_dev->fbd_flags |= FBDF_HAS_PATH; | |
554 | break; | |
555 | case Opt_fd_dev_size: | |
556 | arg_p = match_strdup(&args[0]); | |
6d180253 JJ |
557 | if (!arg_p) { |
558 | ret = -ENOMEM; | |
559 | break; | |
560 | } | |
c66ac9db | 561 | ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); |
6d180253 | 562 | kfree(arg_p); |
c66ac9db NB |
563 | if (ret < 0) { |
564 | printk(KERN_ERR "strict_strtoull() failed for" | |
565 | " fd_dev_size=\n"); | |
566 | goto out; | |
567 | } | |
568 | printk(KERN_INFO "FILEIO: Referencing Size: %llu" | |
569 | " bytes\n", fd_dev->fd_dev_size); | |
570 | fd_dev->fbd_flags |= FBDF_HAS_SIZE; | |
571 | break; | |
572 | case Opt_fd_buffered_io: | |
573 | match_int(args, &arg); | |
574 | if (arg != 1) { | |
575 | printk(KERN_ERR "bogus fd_buffered_io=%d value\n", arg); | |
576 | ret = -EINVAL; | |
577 | goto out; | |
578 | } | |
579 | ||
580 | printk(KERN_INFO "FILEIO: Using buffered I/O" | |
581 | " operations for struct fd_dev\n"); | |
582 | ||
583 | fd_dev->fbd_flags |= FDBD_USE_BUFFERED_IO; | |
584 | break; | |
585 | default: | |
586 | break; | |
587 | } | |
588 | } | |
589 | ||
590 | out: | |
591 | kfree(orig); | |
592 | return (!ret) ? count : ret; | |
593 | } | |
594 | ||
595 | static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) | |
596 | { | |
597 | struct fd_dev *fd_dev = (struct fd_dev *) se_dev->se_dev_su_ptr; | |
598 | ||
599 | if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { | |
600 | printk(KERN_ERR "Missing fd_dev_name=\n"); | |
e3d6f909 | 601 | return -EINVAL; |
c66ac9db NB |
602 | } |
603 | ||
604 | return 0; | |
605 | } | |
606 | ||
607 | static ssize_t fd_show_configfs_dev_params( | |
608 | struct se_hba *hba, | |
609 | struct se_subsystem_dev *se_dev, | |
610 | char *b) | |
611 | { | |
612 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; | |
613 | ssize_t bl = 0; | |
614 | ||
615 | bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); | |
616 | bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", | |
617 | fd_dev->fd_dev_name, fd_dev->fd_dev_size, | |
618 | (fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO) ? | |
619 | "Buffered" : "Synchronous"); | |
620 | return bl; | |
621 | } | |
622 | ||
623 | /* fd_get_cdb(): (Part of se_subsystem_api_t template) | |
624 | * | |
625 | * | |
626 | */ | |
627 | static unsigned char *fd_get_cdb(struct se_task *task) | |
628 | { | |
629 | struct fd_request *req = FILE_REQ(task); | |
630 | ||
631 | return req->fd_scsi_cdb; | |
632 | } | |
633 | ||
634 | /* fd_get_device_rev(): (Part of se_subsystem_api_t template) | |
635 | * | |
636 | * | |
637 | */ | |
638 | static u32 fd_get_device_rev(struct se_device *dev) | |
639 | { | |
640 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
641 | } | |
642 | ||
643 | /* fd_get_device_type(): (Part of se_subsystem_api_t template) | |
644 | * | |
645 | * | |
646 | */ | |
647 | static u32 fd_get_device_type(struct se_device *dev) | |
648 | { | |
649 | return TYPE_DISK; | |
650 | } | |
651 | ||
652 | static sector_t fd_get_blocks(struct se_device *dev) | |
653 | { | |
654 | struct fd_dev *fd_dev = dev->dev_ptr; | |
655 | unsigned long long blocks_long = div_u64(fd_dev->fd_dev_size, | |
e3d6f909 | 656 | dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
657 | |
658 | return blocks_long; | |
659 | } | |
660 | ||
661 | static struct se_subsystem_api fileio_template = { | |
662 | .name = "fileio", | |
663 | .owner = THIS_MODULE, | |
664 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
665 | .attach_hba = fd_attach_hba, | |
666 | .detach_hba = fd_detach_hba, | |
667 | .allocate_virtdevice = fd_allocate_virtdevice, | |
668 | .create_virtdevice = fd_create_virtdevice, | |
669 | .free_device = fd_free_device, | |
670 | .dpo_emulated = fd_emulated_dpo, | |
671 | .fua_write_emulated = fd_emulated_fua_write, | |
672 | .fua_read_emulated = fd_emulated_fua_read, | |
673 | .write_cache_emulated = fd_emulated_write_cache, | |
674 | .alloc_task = fd_alloc_task, | |
675 | .do_task = fd_do_task, | |
676 | .do_sync_cache = fd_emulate_sync_cache, | |
677 | .free_task = fd_free_task, | |
678 | .check_configfs_dev_params = fd_check_configfs_dev_params, | |
679 | .set_configfs_dev_params = fd_set_configfs_dev_params, | |
680 | .show_configfs_dev_params = fd_show_configfs_dev_params, | |
681 | .get_cdb = fd_get_cdb, | |
682 | .get_device_rev = fd_get_device_rev, | |
683 | .get_device_type = fd_get_device_type, | |
684 | .get_blocks = fd_get_blocks, | |
685 | }; | |
686 | ||
687 | static int __init fileio_module_init(void) | |
688 | { | |
689 | return transport_subsystem_register(&fileio_template); | |
690 | } | |
691 | ||
692 | static void fileio_module_exit(void) | |
693 | { | |
694 | transport_subsystem_release(&fileio_template); | |
695 | } | |
696 | ||
697 | MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); | |
698 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
699 | MODULE_LICENSE("GPL"); | |
700 | ||
701 | module_init(fileio_module_init); | |
702 | module_exit(fileio_module_exit); |