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 | ||
c66ac9db NB |
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> | |
827509e3 | 35 | #include <linux/module.h> |
c66ac9db NB |
36 | #include <scsi/scsi.h> |
37 | #include <scsi/scsi_host.h> | |
38 | ||
39 | #include <target/target_core_base.h> | |
c4795fb2 | 40 | #include <target/target_core_backend.h> |
c66ac9db NB |
41 | |
42 | #include "target_core_file.h" | |
43 | ||
c66ac9db NB |
44 | static struct se_subsystem_api fileio_template; |
45 | ||
46 | /* fd_attach_hba(): (Part of se_subsystem_api_t template) | |
47 | * | |
48 | * | |
49 | */ | |
50 | static int fd_attach_hba(struct se_hba *hba, u32 host_id) | |
51 | { | |
52 | struct fd_host *fd_host; | |
53 | ||
54 | fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); | |
6708bb27 AG |
55 | if (!fd_host) { |
56 | pr_err("Unable to allocate memory for struct fd_host\n"); | |
e3d6f909 | 57 | return -ENOMEM; |
c66ac9db NB |
58 | } |
59 | ||
60 | fd_host->fd_host_id = host_id; | |
61 | ||
e3d6f909 | 62 | hba->hba_ptr = fd_host; |
c66ac9db | 63 | |
6708bb27 | 64 | pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" |
c66ac9db NB |
65 | " Target Core Stack %s\n", hba->hba_id, FD_VERSION, |
66 | TARGET_CORE_MOD_VERSION); | |
6708bb27 | 67 | pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" |
e3d6f909 AG |
68 | " MaxSectors: %u\n", |
69 | hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS); | |
c66ac9db NB |
70 | |
71 | return 0; | |
72 | } | |
73 | ||
74 | static void fd_detach_hba(struct se_hba *hba) | |
75 | { | |
76 | struct fd_host *fd_host = hba->hba_ptr; | |
77 | ||
6708bb27 | 78 | pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" |
c66ac9db NB |
79 | " Target Core\n", hba->hba_id, fd_host->fd_host_id); |
80 | ||
81 | kfree(fd_host); | |
82 | hba->hba_ptr = NULL; | |
83 | } | |
84 | ||
85 | static void *fd_allocate_virtdevice(struct se_hba *hba, const char *name) | |
86 | { | |
87 | struct fd_dev *fd_dev; | |
8359cf43 | 88 | struct fd_host *fd_host = hba->hba_ptr; |
c66ac9db NB |
89 | |
90 | fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); | |
6708bb27 AG |
91 | if (!fd_dev) { |
92 | pr_err("Unable to allocate memory for struct fd_dev\n"); | |
c66ac9db NB |
93 | return NULL; |
94 | } | |
95 | ||
96 | fd_dev->fd_host = fd_host; | |
97 | ||
6708bb27 | 98 | pr_debug("FILEIO: Allocated fd_dev for %p\n", name); |
c66ac9db NB |
99 | |
100 | return fd_dev; | |
101 | } | |
102 | ||
103 | /* fd_create_virtdevice(): (Part of se_subsystem_api_t template) | |
104 | * | |
105 | * | |
106 | */ | |
107 | static struct se_device *fd_create_virtdevice( | |
108 | struct se_hba *hba, | |
109 | struct se_subsystem_dev *se_dev, | |
110 | void *p) | |
111 | { | |
112 | char *dev_p = NULL; | |
113 | struct se_device *dev; | |
114 | struct se_dev_limits dev_limits; | |
115 | struct queue_limits *limits; | |
8359cf43 JE |
116 | struct fd_dev *fd_dev = p; |
117 | struct fd_host *fd_host = hba->hba_ptr; | |
c66ac9db NB |
118 | mm_segment_t old_fs; |
119 | struct file *file; | |
120 | struct inode *inode = NULL; | |
613640e4 | 121 | int dev_flags = 0, flags, ret = -EINVAL; |
c66ac9db NB |
122 | |
123 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
124 | ||
125 | old_fs = get_fs(); | |
126 | set_fs(get_ds()); | |
127 | dev_p = getname(fd_dev->fd_dev_name); | |
128 | set_fs(old_fs); | |
129 | ||
130 | if (IS_ERR(dev_p)) { | |
6708bb27 | 131 | pr_err("getname(%s) failed: %lu\n", |
c66ac9db | 132 | fd_dev->fd_dev_name, IS_ERR(dev_p)); |
613640e4 | 133 | ret = PTR_ERR(dev_p); |
c66ac9db NB |
134 | goto fail; |
135 | } | |
8b1e1244 AG |
136 | |
137 | /* O_DIRECT too? */ | |
c66ac9db | 138 | flags = O_RDWR | O_CREAT | O_LARGEFILE; |
8b1e1244 | 139 | |
c66ac9db | 140 | /* |
25985edc | 141 | * If fd_buffered_io=1 has not been set explicitly (the default), |
c66ac9db NB |
142 | * use O_SYNC to force FILEIO writes to disk. |
143 | */ | |
144 | if (!(fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO)) | |
145 | flags |= O_SYNC; | |
146 | ||
147 | file = filp_open(dev_p, flags, 0600); | |
613640e4 | 148 | if (IS_ERR(file)) { |
6708bb27 | 149 | pr_err("filp_open(%s) failed\n", dev_p); |
613640e4 NB |
150 | ret = PTR_ERR(file); |
151 | goto fail; | |
152 | } | |
153 | if (!file || !file->f_dentry) { | |
6708bb27 | 154 | pr_err("filp_open(%s) failed\n", dev_p); |
c66ac9db NB |
155 | goto fail; |
156 | } | |
157 | fd_dev->fd_file = file; | |
158 | /* | |
159 | * If using a block backend with this struct file, we extract | |
160 | * fd_dev->fd_[block,dev]_size from struct block_device. | |
161 | * | |
162 | * Otherwise, we use the passed fd_size= from configfs | |
163 | */ | |
164 | inode = file->f_mapping->host; | |
165 | if (S_ISBLK(inode->i_mode)) { | |
166 | struct request_queue *q; | |
167 | /* | |
168 | * Setup the local scope queue_limits from struct request_queue->limits | |
169 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. | |
170 | */ | |
171 | q = bdev_get_queue(inode->i_bdev); | |
172 | limits = &dev_limits.limits; | |
173 | limits->logical_block_size = bdev_logical_block_size(inode->i_bdev); | |
174 | limits->max_hw_sectors = queue_max_hw_sectors(q); | |
175 | limits->max_sectors = queue_max_sectors(q); | |
176 | /* | |
177 | * Determine the number of bytes from i_size_read() minus | |
178 | * one (1) logical sector from underlying struct block_device | |
179 | */ | |
180 | fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); | |
181 | fd_dev->fd_dev_size = (i_size_read(file->f_mapping->host) - | |
182 | fd_dev->fd_block_size); | |
183 | ||
6708bb27 | 184 | pr_debug("FILEIO: Using size: %llu bytes from struct" |
c66ac9db NB |
185 | " block_device blocks: %llu logical_block_size: %d\n", |
186 | fd_dev->fd_dev_size, | |
187 | div_u64(fd_dev->fd_dev_size, fd_dev->fd_block_size), | |
188 | fd_dev->fd_block_size); | |
189 | } else { | |
190 | if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { | |
6708bb27 | 191 | pr_err("FILEIO: Missing fd_dev_size=" |
c66ac9db NB |
192 | " parameter, and no backing struct" |
193 | " block_device\n"); | |
194 | goto fail; | |
195 | } | |
196 | ||
197 | limits = &dev_limits.limits; | |
198 | limits->logical_block_size = FD_BLOCKSIZE; | |
199 | limits->max_hw_sectors = FD_MAX_SECTORS; | |
200 | limits->max_sectors = FD_MAX_SECTORS; | |
201 | fd_dev->fd_block_size = FD_BLOCKSIZE; | |
202 | } | |
203 | ||
204 | dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; | |
205 | dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH; | |
206 | ||
207 | dev = transport_add_device_to_core_hba(hba, &fileio_template, | |
5951146d | 208 | se_dev, dev_flags, fd_dev, |
c66ac9db | 209 | &dev_limits, "FILEIO", FD_VERSION); |
6708bb27 | 210 | if (!dev) |
c66ac9db NB |
211 | goto fail; |
212 | ||
213 | fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; | |
214 | fd_dev->fd_queue_depth = dev->queue_depth; | |
215 | ||
6708bb27 | 216 | pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," |
c66ac9db NB |
217 | " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, |
218 | fd_dev->fd_dev_name, fd_dev->fd_dev_size); | |
219 | ||
220 | putname(dev_p); | |
221 | return dev; | |
222 | fail: | |
223 | if (fd_dev->fd_file) { | |
224 | filp_close(fd_dev->fd_file, NULL); | |
225 | fd_dev->fd_file = NULL; | |
226 | } | |
227 | putname(dev_p); | |
613640e4 | 228 | return ERR_PTR(ret); |
c66ac9db NB |
229 | } |
230 | ||
231 | /* fd_free_device(): (Part of se_subsystem_api_t template) | |
232 | * | |
233 | * | |
234 | */ | |
235 | static void fd_free_device(void *p) | |
236 | { | |
8359cf43 | 237 | struct fd_dev *fd_dev = p; |
c66ac9db NB |
238 | |
239 | if (fd_dev->fd_file) { | |
240 | filp_close(fd_dev->fd_file, NULL); | |
241 | fd_dev->fd_file = NULL; | |
242 | } | |
243 | ||
244 | kfree(fd_dev); | |
245 | } | |
246 | ||
247 | static inline struct fd_request *FILE_REQ(struct se_task *task) | |
248 | { | |
249 | return container_of(task, struct fd_request, fd_task); | |
250 | } | |
251 | ||
252 | ||
253 | static struct se_task * | |
6708bb27 | 254 | fd_alloc_task(unsigned char *cdb) |
c66ac9db NB |
255 | { |
256 | struct fd_request *fd_req; | |
257 | ||
258 | fd_req = kzalloc(sizeof(struct fd_request), GFP_KERNEL); | |
6708bb27 AG |
259 | if (!fd_req) { |
260 | pr_err("Unable to allocate struct fd_request\n"); | |
c66ac9db NB |
261 | return NULL; |
262 | } | |
263 | ||
c66ac9db NB |
264 | return &fd_req->fd_task; |
265 | } | |
266 | ||
267 | static int fd_do_readv(struct se_task *task) | |
268 | { | |
269 | struct fd_request *req = FILE_REQ(task); | |
42bf829e CH |
270 | struct se_device *se_dev = req->fd_task.task_se_cmd->se_dev; |
271 | struct fd_dev *dev = se_dev->dev_ptr; | |
6708bb27 | 272 | struct file *fd = dev->fd_file; |
c66ac9db NB |
273 | struct scatterlist *sg = task->task_sg; |
274 | struct iovec *iov; | |
275 | mm_segment_t old_fs; | |
72a0e5e2 | 276 | loff_t pos = (task->task_se_cmd->t_task_lba * |
42bf829e | 277 | se_dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
278 | int ret = 0, i; |
279 | ||
6708bb27 AG |
280 | iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL); |
281 | if (!iov) { | |
282 | pr_err("Unable to allocate fd_do_readv iov[]\n"); | |
e3d6f909 | 283 | return -ENOMEM; |
c66ac9db NB |
284 | } |
285 | ||
9649fa1b SAS |
286 | for_each_sg(task->task_sg, sg, task->task_sg_nents, i) { |
287 | iov[i].iov_len = sg->length; | |
288 | iov[i].iov_base = sg_virt(sg); | |
c66ac9db NB |
289 | } |
290 | ||
291 | old_fs = get_fs(); | |
292 | set_fs(get_ds()); | |
6708bb27 | 293 | ret = vfs_readv(fd, &iov[0], task->task_sg_nents, &pos); |
c66ac9db NB |
294 | set_fs(old_fs); |
295 | ||
296 | kfree(iov); | |
297 | /* | |
298 | * Return zeros and GOOD status even if the READ did not return | |
299 | * the expected virt_size for struct file w/o a backing struct | |
300 | * block_device. | |
301 | */ | |
302 | if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { | |
7a83aa4e | 303 | if (ret < 0 || ret != task->task_se_cmd->data_length) { |
6708bb27 | 304 | pr_err("vfs_readv() returned %d," |
c66ac9db | 305 | " expecting %d for S_ISBLK\n", ret, |
7a83aa4e | 306 | (int)task->task_se_cmd->data_length); |
e3d6f909 | 307 | return (ret < 0 ? ret : -EINVAL); |
c66ac9db NB |
308 | } |
309 | } else { | |
310 | if (ret < 0) { | |
6708bb27 | 311 | pr_err("vfs_readv() returned %d for non" |
c66ac9db | 312 | " S_ISBLK\n", ret); |
e3d6f909 | 313 | return ret; |
c66ac9db NB |
314 | } |
315 | } | |
316 | ||
317 | return 1; | |
318 | } | |
319 | ||
320 | static int fd_do_writev(struct se_task *task) | |
321 | { | |
322 | struct fd_request *req = FILE_REQ(task); | |
42bf829e CH |
323 | struct se_device *se_dev = req->fd_task.task_se_cmd->se_dev; |
324 | struct fd_dev *dev = se_dev->dev_ptr; | |
6708bb27 | 325 | struct file *fd = dev->fd_file; |
c66ac9db NB |
326 | struct scatterlist *sg = task->task_sg; |
327 | struct iovec *iov; | |
328 | mm_segment_t old_fs; | |
72a0e5e2 | 329 | loff_t pos = (task->task_se_cmd->t_task_lba * |
42bf829e | 330 | se_dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
331 | int ret, i = 0; |
332 | ||
6708bb27 AG |
333 | iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL); |
334 | if (!iov) { | |
335 | pr_err("Unable to allocate fd_do_writev iov[]\n"); | |
e3d6f909 | 336 | return -ENOMEM; |
c66ac9db NB |
337 | } |
338 | ||
9649fa1b SAS |
339 | for_each_sg(task->task_sg, sg, task->task_sg_nents, i) { |
340 | iov[i].iov_len = sg->length; | |
341 | iov[i].iov_base = sg_virt(sg); | |
c66ac9db NB |
342 | } |
343 | ||
344 | old_fs = get_fs(); | |
345 | set_fs(get_ds()); | |
6708bb27 | 346 | ret = vfs_writev(fd, &iov[0], task->task_sg_nents, &pos); |
c66ac9db NB |
347 | set_fs(old_fs); |
348 | ||
349 | kfree(iov); | |
350 | ||
7a83aa4e | 351 | if (ret < 0 || ret != task->task_se_cmd->data_length) { |
6708bb27 | 352 | pr_err("vfs_writev() returned %d\n", ret); |
e3d6f909 | 353 | return (ret < 0 ? ret : -EINVAL); |
c66ac9db NB |
354 | } |
355 | ||
356 | return 1; | |
357 | } | |
358 | ||
6bb35e00 | 359 | static void fd_emulate_sync_cache(struct se_cmd *cmd) |
c66ac9db | 360 | { |
c66ac9db NB |
361 | struct se_device *dev = cmd->se_dev; |
362 | struct fd_dev *fd_dev = dev->dev_ptr; | |
a1d8b49a | 363 | int immed = (cmd->t_task_cdb[1] & 0x2); |
c66ac9db NB |
364 | loff_t start, end; |
365 | int ret; | |
366 | ||
367 | /* | |
368 | * If the Immediate bit is set, queue up the GOOD response | |
369 | * for this SYNCHRONIZE_CACHE op | |
370 | */ | |
371 | if (immed) | |
372 | transport_complete_sync_cache(cmd, 1); | |
373 | ||
374 | /* | |
375 | * Determine if we will be flushing the entire device. | |
376 | */ | |
a1d8b49a | 377 | if (cmd->t_task_lba == 0 && cmd->data_length == 0) { |
c66ac9db NB |
378 | start = 0; |
379 | end = LLONG_MAX; | |
380 | } else { | |
a1d8b49a | 381 | start = cmd->t_task_lba * dev->se_sub_dev->se_dev_attrib.block_size; |
c66ac9db NB |
382 | if (cmd->data_length) |
383 | end = start + cmd->data_length; | |
384 | else | |
385 | end = LLONG_MAX; | |
386 | } | |
387 | ||
388 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); | |
389 | if (ret != 0) | |
6708bb27 | 390 | pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); |
c66ac9db NB |
391 | |
392 | if (!immed) | |
393 | transport_complete_sync_cache(cmd, ret == 0); | |
394 | } | |
395 | ||
c66ac9db NB |
396 | /* |
397 | * WRITE Force Unit Access (FUA) emulation on a per struct se_task | |
398 | * LBA range basis.. | |
399 | */ | |
400 | static void fd_emulate_write_fua(struct se_cmd *cmd, struct se_task *task) | |
401 | { | |
402 | struct se_device *dev = cmd->se_dev; | |
403 | struct fd_dev *fd_dev = dev->dev_ptr; | |
72a0e5e2 CH |
404 | loff_t start = task->task_se_cmd->t_task_lba * |
405 | dev->se_sub_dev->se_dev_attrib.block_size; | |
7a83aa4e | 406 | loff_t end = start + task->task_se_cmd->data_length; |
c66ac9db NB |
407 | int ret; |
408 | ||
6708bb27 | 409 | pr_debug("FILEIO: FUA WRITE LBA: %llu, bytes: %u\n", |
7a83aa4e CH |
410 | task->task_se_cmd->t_task_lba, |
411 | task->task_se_cmd->data_length); | |
c66ac9db NB |
412 | |
413 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); | |
414 | if (ret != 0) | |
6708bb27 | 415 | pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); |
c66ac9db NB |
416 | } |
417 | ||
418 | static int fd_do_task(struct se_task *task) | |
419 | { | |
420 | struct se_cmd *cmd = task->task_se_cmd; | |
421 | struct se_device *dev = cmd->se_dev; | |
422 | int ret = 0; | |
423 | ||
424 | /* | |
425 | * Call vectorized fileio functions to map struct scatterlist | |
426 | * physical memory addresses to struct iovec virtual memory. | |
427 | */ | |
428 | if (task->task_data_direction == DMA_FROM_DEVICE) { | |
429 | ret = fd_do_readv(task); | |
430 | } else { | |
431 | ret = fd_do_writev(task); | |
432 | ||
433 | if (ret > 0 && | |
e3d6f909 AG |
434 | dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0 && |
435 | dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && | |
2d3a4b51 | 436 | (cmd->se_cmd_flags & SCF_FUA)) { |
c66ac9db NB |
437 | /* |
438 | * We might need to be a bit smarter here | |
439 | * and return some sense data to let the initiator | |
440 | * know the FUA WRITE cache sync failed..? | |
441 | */ | |
442 | fd_emulate_write_fua(cmd, task); | |
443 | } | |
444 | ||
445 | } | |
446 | ||
03e98c9e NB |
447 | if (ret < 0) { |
448 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
c66ac9db | 449 | return ret; |
03e98c9e | 450 | } |
c66ac9db NB |
451 | if (ret) { |
452 | task->task_scsi_status = GOOD; | |
453 | transport_complete_task(task, 1); | |
454 | } | |
03e98c9e | 455 | return 0; |
c66ac9db NB |
456 | } |
457 | ||
458 | /* fd_free_task(): (Part of se_subsystem_api_t template) | |
459 | * | |
460 | * | |
461 | */ | |
462 | static void fd_free_task(struct se_task *task) | |
463 | { | |
464 | struct fd_request *req = FILE_REQ(task); | |
465 | ||
466 | kfree(req); | |
467 | } | |
468 | ||
469 | enum { | |
470 | Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err | |
471 | }; | |
472 | ||
473 | static match_table_t tokens = { | |
474 | {Opt_fd_dev_name, "fd_dev_name=%s"}, | |
475 | {Opt_fd_dev_size, "fd_dev_size=%s"}, | |
58c3e647 | 476 | {Opt_fd_buffered_io, "fd_buffered_io=%d"}, |
c66ac9db NB |
477 | {Opt_err, NULL} |
478 | }; | |
479 | ||
480 | static ssize_t fd_set_configfs_dev_params( | |
481 | struct se_hba *hba, | |
482 | struct se_subsystem_dev *se_dev, | |
483 | const char *page, ssize_t count) | |
484 | { | |
485 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; | |
486 | char *orig, *ptr, *arg_p, *opts; | |
487 | substring_t args[MAX_OPT_ARGS]; | |
488 | int ret = 0, arg, token; | |
489 | ||
490 | opts = kstrdup(page, GFP_KERNEL); | |
491 | if (!opts) | |
492 | return -ENOMEM; | |
493 | ||
494 | orig = opts; | |
495 | ||
90c161b6 | 496 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
497 | if (!*ptr) |
498 | continue; | |
499 | ||
500 | token = match_token(ptr, tokens, args); | |
501 | switch (token) { | |
502 | case Opt_fd_dev_name: | |
6d180253 JJ |
503 | arg_p = match_strdup(&args[0]); |
504 | if (!arg_p) { | |
505 | ret = -ENOMEM; | |
506 | break; | |
507 | } | |
c66ac9db | 508 | snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME, |
6d180253 JJ |
509 | "%s", arg_p); |
510 | kfree(arg_p); | |
6708bb27 | 511 | pr_debug("FILEIO: Referencing Path: %s\n", |
c66ac9db NB |
512 | fd_dev->fd_dev_name); |
513 | fd_dev->fbd_flags |= FBDF_HAS_PATH; | |
514 | break; | |
515 | case Opt_fd_dev_size: | |
516 | arg_p = match_strdup(&args[0]); | |
6d180253 JJ |
517 | if (!arg_p) { |
518 | ret = -ENOMEM; | |
519 | break; | |
520 | } | |
c66ac9db | 521 | ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); |
6d180253 | 522 | kfree(arg_p); |
c66ac9db | 523 | if (ret < 0) { |
6708bb27 | 524 | pr_err("strict_strtoull() failed for" |
c66ac9db NB |
525 | " fd_dev_size=\n"); |
526 | goto out; | |
527 | } | |
6708bb27 | 528 | pr_debug("FILEIO: Referencing Size: %llu" |
c66ac9db NB |
529 | " bytes\n", fd_dev->fd_dev_size); |
530 | fd_dev->fbd_flags |= FBDF_HAS_SIZE; | |
531 | break; | |
532 | case Opt_fd_buffered_io: | |
533 | match_int(args, &arg); | |
534 | if (arg != 1) { | |
6708bb27 | 535 | pr_err("bogus fd_buffered_io=%d value\n", arg); |
c66ac9db NB |
536 | ret = -EINVAL; |
537 | goto out; | |
538 | } | |
539 | ||
6708bb27 | 540 | pr_debug("FILEIO: Using buffered I/O" |
c66ac9db NB |
541 | " operations for struct fd_dev\n"); |
542 | ||
543 | fd_dev->fbd_flags |= FDBD_USE_BUFFERED_IO; | |
544 | break; | |
545 | default: | |
546 | break; | |
547 | } | |
548 | } | |
549 | ||
550 | out: | |
551 | kfree(orig); | |
552 | return (!ret) ? count : ret; | |
553 | } | |
554 | ||
555 | static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) | |
556 | { | |
8359cf43 | 557 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; |
c66ac9db NB |
558 | |
559 | if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { | |
6708bb27 | 560 | pr_err("Missing fd_dev_name=\n"); |
e3d6f909 | 561 | return -EINVAL; |
c66ac9db NB |
562 | } |
563 | ||
564 | return 0; | |
565 | } | |
566 | ||
567 | static ssize_t fd_show_configfs_dev_params( | |
568 | struct se_hba *hba, | |
569 | struct se_subsystem_dev *se_dev, | |
570 | char *b) | |
571 | { | |
572 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; | |
573 | ssize_t bl = 0; | |
574 | ||
575 | bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); | |
576 | bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", | |
577 | fd_dev->fd_dev_name, fd_dev->fd_dev_size, | |
578 | (fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO) ? | |
579 | "Buffered" : "Synchronous"); | |
580 | return bl; | |
581 | } | |
582 | ||
c66ac9db NB |
583 | /* fd_get_device_rev(): (Part of se_subsystem_api_t template) |
584 | * | |
585 | * | |
586 | */ | |
587 | static u32 fd_get_device_rev(struct se_device *dev) | |
588 | { | |
589 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
590 | } | |
591 | ||
592 | /* fd_get_device_type(): (Part of se_subsystem_api_t template) | |
593 | * | |
594 | * | |
595 | */ | |
596 | static u32 fd_get_device_type(struct se_device *dev) | |
597 | { | |
598 | return TYPE_DISK; | |
599 | } | |
600 | ||
601 | static sector_t fd_get_blocks(struct se_device *dev) | |
602 | { | |
603 | struct fd_dev *fd_dev = dev->dev_ptr; | |
604 | unsigned long long blocks_long = div_u64(fd_dev->fd_dev_size, | |
e3d6f909 | 605 | dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
606 | |
607 | return blocks_long; | |
608 | } | |
609 | ||
610 | static struct se_subsystem_api fileio_template = { | |
611 | .name = "fileio", | |
612 | .owner = THIS_MODULE, | |
613 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
f55918fa CH |
614 | .write_cache_emulated = 1, |
615 | .fua_write_emulated = 1, | |
c66ac9db NB |
616 | .attach_hba = fd_attach_hba, |
617 | .detach_hba = fd_detach_hba, | |
618 | .allocate_virtdevice = fd_allocate_virtdevice, | |
619 | .create_virtdevice = fd_create_virtdevice, | |
620 | .free_device = fd_free_device, | |
c66ac9db NB |
621 | .alloc_task = fd_alloc_task, |
622 | .do_task = fd_do_task, | |
623 | .do_sync_cache = fd_emulate_sync_cache, | |
624 | .free_task = fd_free_task, | |
625 | .check_configfs_dev_params = fd_check_configfs_dev_params, | |
626 | .set_configfs_dev_params = fd_set_configfs_dev_params, | |
627 | .show_configfs_dev_params = fd_show_configfs_dev_params, | |
c66ac9db NB |
628 | .get_device_rev = fd_get_device_rev, |
629 | .get_device_type = fd_get_device_type, | |
630 | .get_blocks = fd_get_blocks, | |
631 | }; | |
632 | ||
633 | static int __init fileio_module_init(void) | |
634 | { | |
635 | return transport_subsystem_register(&fileio_template); | |
636 | } | |
637 | ||
638 | static void fileio_module_exit(void) | |
639 | { | |
640 | transport_subsystem_release(&fileio_template); | |
641 | } | |
642 | ||
643 | MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); | |
644 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
645 | MODULE_LICENSE("GPL"); | |
646 | ||
647 | module_init(fileio_module_init); | |
648 | module_exit(fileio_module_exit); |