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> | |
40 | #include <target/target_core_device.h> | |
41 | #include <target/target_core_transport.h> | |
42 | ||
43 | #include "target_core_file.h" | |
44 | ||
c66ac9db NB |
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); | |
6708bb27 AG |
56 | if (!fd_host) { |
57 | pr_err("Unable to allocate memory for struct fd_host\n"); | |
e3d6f909 | 58 | return -ENOMEM; |
c66ac9db NB |
59 | } |
60 | ||
61 | fd_host->fd_host_id = host_id; | |
62 | ||
e3d6f909 | 63 | hba->hba_ptr = fd_host; |
c66ac9db | 64 | |
6708bb27 | 65 | pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" |
c66ac9db NB |
66 | " Target Core Stack %s\n", hba->hba_id, FD_VERSION, |
67 | TARGET_CORE_MOD_VERSION); | |
6708bb27 | 68 | pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" |
e3d6f909 AG |
69 | " MaxSectors: %u\n", |
70 | hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS); | |
c66ac9db NB |
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 | ||
6708bb27 | 79 | pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" |
c66ac9db NB |
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); | |
6708bb27 AG |
92 | if (!fd_dev) { |
93 | pr_err("Unable to allocate memory for struct fd_dev\n"); | |
c66ac9db NB |
94 | return NULL; |
95 | } | |
96 | ||
97 | fd_dev->fd_host = fd_host; | |
98 | ||
6708bb27 | 99 | pr_debug("FILEIO: Allocated fd_dev for %p\n", name); |
c66ac9db NB |
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; | |
613640e4 | 122 | int dev_flags = 0, flags, ret = -EINVAL; |
c66ac9db NB |
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)) { | |
6708bb27 | 132 | pr_err("getname(%s) failed: %lu\n", |
c66ac9db | 133 | fd_dev->fd_dev_name, IS_ERR(dev_p)); |
613640e4 | 134 | ret = PTR_ERR(dev_p); |
c66ac9db NB |
135 | goto fail; |
136 | } | |
137 | #if 0 | |
138 | if (di->no_create_file) | |
139 | flags = O_RDWR | O_LARGEFILE; | |
140 | else | |
141 | flags = O_RDWR | O_CREAT | O_LARGEFILE; | |
142 | #else | |
143 | flags = O_RDWR | O_CREAT | O_LARGEFILE; | |
144 | #endif | |
145 | /* flags |= O_DIRECT; */ | |
146 | /* | |
25985edc | 147 | * If fd_buffered_io=1 has not been set explicitly (the default), |
c66ac9db NB |
148 | * use O_SYNC to force FILEIO writes to disk. |
149 | */ | |
150 | if (!(fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO)) | |
151 | flags |= O_SYNC; | |
152 | ||
153 | file = filp_open(dev_p, flags, 0600); | |
613640e4 | 154 | if (IS_ERR(file)) { |
6708bb27 | 155 | pr_err("filp_open(%s) failed\n", dev_p); |
613640e4 NB |
156 | ret = PTR_ERR(file); |
157 | goto fail; | |
158 | } | |
159 | if (!file || !file->f_dentry) { | |
6708bb27 | 160 | pr_err("filp_open(%s) failed\n", dev_p); |
c66ac9db NB |
161 | goto fail; |
162 | } | |
163 | fd_dev->fd_file = file; | |
164 | /* | |
165 | * If using a block backend with this struct file, we extract | |
166 | * fd_dev->fd_[block,dev]_size from struct block_device. | |
167 | * | |
168 | * Otherwise, we use the passed fd_size= from configfs | |
169 | */ | |
170 | inode = file->f_mapping->host; | |
171 | if (S_ISBLK(inode->i_mode)) { | |
172 | struct request_queue *q; | |
173 | /* | |
174 | * Setup the local scope queue_limits from struct request_queue->limits | |
175 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. | |
176 | */ | |
177 | q = bdev_get_queue(inode->i_bdev); | |
178 | limits = &dev_limits.limits; | |
179 | limits->logical_block_size = bdev_logical_block_size(inode->i_bdev); | |
180 | limits->max_hw_sectors = queue_max_hw_sectors(q); | |
181 | limits->max_sectors = queue_max_sectors(q); | |
182 | /* | |
183 | * Determine the number of bytes from i_size_read() minus | |
184 | * one (1) logical sector from underlying struct block_device | |
185 | */ | |
186 | fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); | |
187 | fd_dev->fd_dev_size = (i_size_read(file->f_mapping->host) - | |
188 | fd_dev->fd_block_size); | |
189 | ||
6708bb27 | 190 | pr_debug("FILEIO: Using size: %llu bytes from struct" |
c66ac9db NB |
191 | " block_device blocks: %llu logical_block_size: %d\n", |
192 | fd_dev->fd_dev_size, | |
193 | div_u64(fd_dev->fd_dev_size, fd_dev->fd_block_size), | |
194 | fd_dev->fd_block_size); | |
195 | } else { | |
196 | if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { | |
6708bb27 | 197 | pr_err("FILEIO: Missing fd_dev_size=" |
c66ac9db NB |
198 | " parameter, and no backing struct" |
199 | " block_device\n"); | |
200 | goto fail; | |
201 | } | |
202 | ||
203 | limits = &dev_limits.limits; | |
204 | limits->logical_block_size = FD_BLOCKSIZE; | |
205 | limits->max_hw_sectors = FD_MAX_SECTORS; | |
206 | limits->max_sectors = FD_MAX_SECTORS; | |
207 | fd_dev->fd_block_size = FD_BLOCKSIZE; | |
208 | } | |
209 | ||
210 | dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; | |
211 | dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH; | |
212 | ||
213 | dev = transport_add_device_to_core_hba(hba, &fileio_template, | |
5951146d | 214 | se_dev, dev_flags, fd_dev, |
c66ac9db | 215 | &dev_limits, "FILEIO", FD_VERSION); |
6708bb27 | 216 | if (!dev) |
c66ac9db NB |
217 | goto fail; |
218 | ||
219 | fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; | |
220 | fd_dev->fd_queue_depth = dev->queue_depth; | |
221 | ||
6708bb27 | 222 | pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," |
c66ac9db NB |
223 | " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, |
224 | fd_dev->fd_dev_name, fd_dev->fd_dev_size); | |
225 | ||
226 | putname(dev_p); | |
227 | return dev; | |
228 | fail: | |
229 | if (fd_dev->fd_file) { | |
230 | filp_close(fd_dev->fd_file, NULL); | |
231 | fd_dev->fd_file = NULL; | |
232 | } | |
233 | putname(dev_p); | |
613640e4 | 234 | return ERR_PTR(ret); |
c66ac9db NB |
235 | } |
236 | ||
237 | /* fd_free_device(): (Part of se_subsystem_api_t template) | |
238 | * | |
239 | * | |
240 | */ | |
241 | static void fd_free_device(void *p) | |
242 | { | |
243 | struct fd_dev *fd_dev = (struct fd_dev *) p; | |
244 | ||
245 | if (fd_dev->fd_file) { | |
246 | filp_close(fd_dev->fd_file, NULL); | |
247 | fd_dev->fd_file = NULL; | |
248 | } | |
249 | ||
250 | kfree(fd_dev); | |
251 | } | |
252 | ||
253 | static inline struct fd_request *FILE_REQ(struct se_task *task) | |
254 | { | |
255 | return container_of(task, struct fd_request, fd_task); | |
256 | } | |
257 | ||
258 | ||
259 | static struct se_task * | |
6708bb27 | 260 | fd_alloc_task(unsigned char *cdb) |
c66ac9db NB |
261 | { |
262 | struct fd_request *fd_req; | |
263 | ||
264 | fd_req = kzalloc(sizeof(struct fd_request), GFP_KERNEL); | |
6708bb27 AG |
265 | if (!fd_req) { |
266 | pr_err("Unable to allocate struct fd_request\n"); | |
c66ac9db NB |
267 | return NULL; |
268 | } | |
269 | ||
c66ac9db NB |
270 | return &fd_req->fd_task; |
271 | } | |
272 | ||
273 | static int fd_do_readv(struct se_task *task) | |
274 | { | |
275 | struct fd_request *req = FILE_REQ(task); | |
42bf829e CH |
276 | struct se_device *se_dev = req->fd_task.task_se_cmd->se_dev; |
277 | struct fd_dev *dev = se_dev->dev_ptr; | |
6708bb27 | 278 | struct file *fd = dev->fd_file; |
c66ac9db NB |
279 | struct scatterlist *sg = task->task_sg; |
280 | struct iovec *iov; | |
281 | mm_segment_t old_fs; | |
e3d6f909 | 282 | loff_t pos = (task->task_lba * |
42bf829e | 283 | se_dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
284 | int ret = 0, i; |
285 | ||
6708bb27 AG |
286 | iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL); |
287 | if (!iov) { | |
288 | pr_err("Unable to allocate fd_do_readv iov[]\n"); | |
e3d6f909 | 289 | return -ENOMEM; |
c66ac9db NB |
290 | } |
291 | ||
6708bb27 | 292 | for (i = 0; i < task->task_sg_nents; i++) { |
c66ac9db NB |
293 | iov[i].iov_len = sg[i].length; |
294 | iov[i].iov_base = sg_virt(&sg[i]); | |
295 | } | |
296 | ||
297 | old_fs = get_fs(); | |
298 | set_fs(get_ds()); | |
6708bb27 | 299 | ret = vfs_readv(fd, &iov[0], task->task_sg_nents, &pos); |
c66ac9db NB |
300 | set_fs(old_fs); |
301 | ||
302 | kfree(iov); | |
303 | /* | |
304 | * Return zeros and GOOD status even if the READ did not return | |
305 | * the expected virt_size for struct file w/o a backing struct | |
306 | * block_device. | |
307 | */ | |
308 | if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { | |
309 | if (ret < 0 || ret != task->task_size) { | |
6708bb27 | 310 | pr_err("vfs_readv() returned %d," |
c66ac9db NB |
311 | " expecting %d for S_ISBLK\n", ret, |
312 | (int)task->task_size); | |
e3d6f909 | 313 | return (ret < 0 ? ret : -EINVAL); |
c66ac9db NB |
314 | } |
315 | } else { | |
316 | if (ret < 0) { | |
6708bb27 | 317 | pr_err("vfs_readv() returned %d for non" |
c66ac9db | 318 | " S_ISBLK\n", ret); |
e3d6f909 | 319 | return ret; |
c66ac9db NB |
320 | } |
321 | } | |
322 | ||
323 | return 1; | |
324 | } | |
325 | ||
326 | static int fd_do_writev(struct se_task *task) | |
327 | { | |
328 | struct fd_request *req = FILE_REQ(task); | |
42bf829e CH |
329 | struct se_device *se_dev = req->fd_task.task_se_cmd->se_dev; |
330 | struct fd_dev *dev = se_dev->dev_ptr; | |
6708bb27 | 331 | struct file *fd = dev->fd_file; |
c66ac9db NB |
332 | struct scatterlist *sg = task->task_sg; |
333 | struct iovec *iov; | |
334 | mm_segment_t old_fs; | |
e3d6f909 | 335 | loff_t pos = (task->task_lba * |
42bf829e | 336 | se_dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
337 | int ret, i = 0; |
338 | ||
6708bb27 AG |
339 | iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL); |
340 | if (!iov) { | |
341 | pr_err("Unable to allocate fd_do_writev iov[]\n"); | |
e3d6f909 | 342 | return -ENOMEM; |
c66ac9db NB |
343 | } |
344 | ||
6708bb27 | 345 | for (i = 0; i < task->task_sg_nents; i++) { |
c66ac9db NB |
346 | iov[i].iov_len = sg[i].length; |
347 | iov[i].iov_base = sg_virt(&sg[i]); | |
348 | } | |
349 | ||
350 | old_fs = get_fs(); | |
351 | set_fs(get_ds()); | |
6708bb27 | 352 | ret = vfs_writev(fd, &iov[0], task->task_sg_nents, &pos); |
c66ac9db NB |
353 | set_fs(old_fs); |
354 | ||
355 | kfree(iov); | |
356 | ||
357 | if (ret < 0 || ret != task->task_size) { | |
6708bb27 | 358 | pr_err("vfs_writev() returned %d\n", ret); |
e3d6f909 | 359 | return (ret < 0 ? ret : -EINVAL); |
c66ac9db NB |
360 | } |
361 | ||
362 | return 1; | |
363 | } | |
364 | ||
365 | static void fd_emulate_sync_cache(struct se_task *task) | |
366 | { | |
e3d6f909 | 367 | struct se_cmd *cmd = task->task_se_cmd; |
c66ac9db NB |
368 | struct se_device *dev = cmd->se_dev; |
369 | struct fd_dev *fd_dev = dev->dev_ptr; | |
a1d8b49a | 370 | int immed = (cmd->t_task_cdb[1] & 0x2); |
c66ac9db NB |
371 | loff_t start, end; |
372 | int ret; | |
373 | ||
374 | /* | |
375 | * If the Immediate bit is set, queue up the GOOD response | |
376 | * for this SYNCHRONIZE_CACHE op | |
377 | */ | |
378 | if (immed) | |
379 | transport_complete_sync_cache(cmd, 1); | |
380 | ||
381 | /* | |
382 | * Determine if we will be flushing the entire device. | |
383 | */ | |
a1d8b49a | 384 | if (cmd->t_task_lba == 0 && cmd->data_length == 0) { |
c66ac9db NB |
385 | start = 0; |
386 | end = LLONG_MAX; | |
387 | } else { | |
a1d8b49a | 388 | start = cmd->t_task_lba * dev->se_sub_dev->se_dev_attrib.block_size; |
c66ac9db NB |
389 | if (cmd->data_length) |
390 | end = start + cmd->data_length; | |
391 | else | |
392 | end = LLONG_MAX; | |
393 | } | |
394 | ||
395 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); | |
396 | if (ret != 0) | |
6708bb27 | 397 | pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); |
c66ac9db NB |
398 | |
399 | if (!immed) | |
400 | transport_complete_sync_cache(cmd, ret == 0); | |
401 | } | |
402 | ||
c66ac9db NB |
403 | /* |
404 | * WRITE Force Unit Access (FUA) emulation on a per struct se_task | |
405 | * LBA range basis.. | |
406 | */ | |
407 | static void fd_emulate_write_fua(struct se_cmd *cmd, struct se_task *task) | |
408 | { | |
409 | struct se_device *dev = cmd->se_dev; | |
410 | struct fd_dev *fd_dev = dev->dev_ptr; | |
e3d6f909 | 411 | loff_t start = task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size; |
c66ac9db NB |
412 | loff_t end = start + task->task_size; |
413 | int ret; | |
414 | ||
6708bb27 | 415 | pr_debug("FILEIO: FUA WRITE LBA: %llu, bytes: %u\n", |
c66ac9db NB |
416 | task->task_lba, task->task_size); |
417 | ||
418 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); | |
419 | if (ret != 0) | |
6708bb27 | 420 | pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); |
c66ac9db NB |
421 | } |
422 | ||
423 | static int fd_do_task(struct se_task *task) | |
424 | { | |
425 | struct se_cmd *cmd = task->task_se_cmd; | |
426 | struct se_device *dev = cmd->se_dev; | |
427 | int ret = 0; | |
428 | ||
429 | /* | |
430 | * Call vectorized fileio functions to map struct scatterlist | |
431 | * physical memory addresses to struct iovec virtual memory. | |
432 | */ | |
433 | if (task->task_data_direction == DMA_FROM_DEVICE) { | |
434 | ret = fd_do_readv(task); | |
435 | } else { | |
436 | ret = fd_do_writev(task); | |
437 | ||
438 | if (ret > 0 && | |
e3d6f909 AG |
439 | dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0 && |
440 | dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && | |
2d3a4b51 | 441 | (cmd->se_cmd_flags & SCF_FUA)) { |
c66ac9db NB |
442 | /* |
443 | * We might need to be a bit smarter here | |
444 | * and return some sense data to let the initiator | |
445 | * know the FUA WRITE cache sync failed..? | |
446 | */ | |
447 | fd_emulate_write_fua(cmd, task); | |
448 | } | |
449 | ||
450 | } | |
451 | ||
03e98c9e NB |
452 | if (ret < 0) { |
453 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
c66ac9db | 454 | return ret; |
03e98c9e | 455 | } |
c66ac9db NB |
456 | if (ret) { |
457 | task->task_scsi_status = GOOD; | |
458 | transport_complete_task(task, 1); | |
459 | } | |
03e98c9e | 460 | return 0; |
c66ac9db NB |
461 | } |
462 | ||
463 | /* fd_free_task(): (Part of se_subsystem_api_t template) | |
464 | * | |
465 | * | |
466 | */ | |
467 | static void fd_free_task(struct se_task *task) | |
468 | { | |
469 | struct fd_request *req = FILE_REQ(task); | |
470 | ||
471 | kfree(req); | |
472 | } | |
473 | ||
474 | enum { | |
475 | Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err | |
476 | }; | |
477 | ||
478 | static match_table_t tokens = { | |
479 | {Opt_fd_dev_name, "fd_dev_name=%s"}, | |
480 | {Opt_fd_dev_size, "fd_dev_size=%s"}, | |
58c3e647 | 481 | {Opt_fd_buffered_io, "fd_buffered_io=%d"}, |
c66ac9db NB |
482 | {Opt_err, NULL} |
483 | }; | |
484 | ||
485 | static ssize_t fd_set_configfs_dev_params( | |
486 | struct se_hba *hba, | |
487 | struct se_subsystem_dev *se_dev, | |
488 | const char *page, ssize_t count) | |
489 | { | |
490 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; | |
491 | char *orig, *ptr, *arg_p, *opts; | |
492 | substring_t args[MAX_OPT_ARGS]; | |
493 | int ret = 0, arg, token; | |
494 | ||
495 | opts = kstrdup(page, GFP_KERNEL); | |
496 | if (!opts) | |
497 | return -ENOMEM; | |
498 | ||
499 | orig = opts; | |
500 | ||
501 | while ((ptr = strsep(&opts, ",")) != NULL) { | |
502 | if (!*ptr) | |
503 | continue; | |
504 | ||
505 | token = match_token(ptr, tokens, args); | |
506 | switch (token) { | |
507 | case Opt_fd_dev_name: | |
6d180253 JJ |
508 | arg_p = match_strdup(&args[0]); |
509 | if (!arg_p) { | |
510 | ret = -ENOMEM; | |
511 | break; | |
512 | } | |
c66ac9db | 513 | snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME, |
6d180253 JJ |
514 | "%s", arg_p); |
515 | kfree(arg_p); | |
6708bb27 | 516 | pr_debug("FILEIO: Referencing Path: %s\n", |
c66ac9db NB |
517 | fd_dev->fd_dev_name); |
518 | fd_dev->fbd_flags |= FBDF_HAS_PATH; | |
519 | break; | |
520 | case Opt_fd_dev_size: | |
521 | arg_p = match_strdup(&args[0]); | |
6d180253 JJ |
522 | if (!arg_p) { |
523 | ret = -ENOMEM; | |
524 | break; | |
525 | } | |
c66ac9db | 526 | ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); |
6d180253 | 527 | kfree(arg_p); |
c66ac9db | 528 | if (ret < 0) { |
6708bb27 | 529 | pr_err("strict_strtoull() failed for" |
c66ac9db NB |
530 | " fd_dev_size=\n"); |
531 | goto out; | |
532 | } | |
6708bb27 | 533 | pr_debug("FILEIO: Referencing Size: %llu" |
c66ac9db NB |
534 | " bytes\n", fd_dev->fd_dev_size); |
535 | fd_dev->fbd_flags |= FBDF_HAS_SIZE; | |
536 | break; | |
537 | case Opt_fd_buffered_io: | |
538 | match_int(args, &arg); | |
539 | if (arg != 1) { | |
6708bb27 | 540 | pr_err("bogus fd_buffered_io=%d value\n", arg); |
c66ac9db NB |
541 | ret = -EINVAL; |
542 | goto out; | |
543 | } | |
544 | ||
6708bb27 | 545 | pr_debug("FILEIO: Using buffered I/O" |
c66ac9db NB |
546 | " operations for struct fd_dev\n"); |
547 | ||
548 | fd_dev->fbd_flags |= FDBD_USE_BUFFERED_IO; | |
549 | break; | |
550 | default: | |
551 | break; | |
552 | } | |
553 | } | |
554 | ||
555 | out: | |
556 | kfree(orig); | |
557 | return (!ret) ? count : ret; | |
558 | } | |
559 | ||
560 | static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) | |
561 | { | |
562 | struct fd_dev *fd_dev = (struct fd_dev *) se_dev->se_dev_su_ptr; | |
563 | ||
564 | if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { | |
6708bb27 | 565 | pr_err("Missing fd_dev_name=\n"); |
e3d6f909 | 566 | return -EINVAL; |
c66ac9db NB |
567 | } |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | static ssize_t fd_show_configfs_dev_params( | |
573 | struct se_hba *hba, | |
574 | struct se_subsystem_dev *se_dev, | |
575 | char *b) | |
576 | { | |
577 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; | |
578 | ssize_t bl = 0; | |
579 | ||
580 | bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); | |
581 | bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", | |
582 | fd_dev->fd_dev_name, fd_dev->fd_dev_size, | |
583 | (fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO) ? | |
584 | "Buffered" : "Synchronous"); | |
585 | return bl; | |
586 | } | |
587 | ||
c66ac9db NB |
588 | /* fd_get_device_rev(): (Part of se_subsystem_api_t template) |
589 | * | |
590 | * | |
591 | */ | |
592 | static u32 fd_get_device_rev(struct se_device *dev) | |
593 | { | |
594 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
595 | } | |
596 | ||
597 | /* fd_get_device_type(): (Part of se_subsystem_api_t template) | |
598 | * | |
599 | * | |
600 | */ | |
601 | static u32 fd_get_device_type(struct se_device *dev) | |
602 | { | |
603 | return TYPE_DISK; | |
604 | } | |
605 | ||
606 | static sector_t fd_get_blocks(struct se_device *dev) | |
607 | { | |
608 | struct fd_dev *fd_dev = dev->dev_ptr; | |
609 | unsigned long long blocks_long = div_u64(fd_dev->fd_dev_size, | |
e3d6f909 | 610 | dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
611 | |
612 | return blocks_long; | |
613 | } | |
614 | ||
615 | static struct se_subsystem_api fileio_template = { | |
616 | .name = "fileio", | |
617 | .owner = THIS_MODULE, | |
618 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
f55918fa CH |
619 | .write_cache_emulated = 1, |
620 | .fua_write_emulated = 1, | |
c66ac9db NB |
621 | .attach_hba = fd_attach_hba, |
622 | .detach_hba = fd_detach_hba, | |
623 | .allocate_virtdevice = fd_allocate_virtdevice, | |
624 | .create_virtdevice = fd_create_virtdevice, | |
625 | .free_device = fd_free_device, | |
c66ac9db NB |
626 | .alloc_task = fd_alloc_task, |
627 | .do_task = fd_do_task, | |
628 | .do_sync_cache = fd_emulate_sync_cache, | |
629 | .free_task = fd_free_task, | |
630 | .check_configfs_dev_params = fd_check_configfs_dev_params, | |
631 | .set_configfs_dev_params = fd_set_configfs_dev_params, | |
632 | .show_configfs_dev_params = fd_show_configfs_dev_params, | |
c66ac9db NB |
633 | .get_device_rev = fd_get_device_rev, |
634 | .get_device_type = fd_get_device_type, | |
635 | .get_blocks = fd_get_blocks, | |
636 | }; | |
637 | ||
638 | static int __init fileio_module_init(void) | |
639 | { | |
640 | return transport_subsystem_register(&fileio_template); | |
641 | } | |
642 | ||
643 | static void fileio_module_exit(void) | |
644 | { | |
645 | transport_subsystem_release(&fileio_template); | |
646 | } | |
647 | ||
648 | MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); | |
649 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
650 | MODULE_LICENSE("GPL"); | |
651 | ||
652 | module_init(fileio_module_init); | |
653 | module_exit(fileio_module_exit); |