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328970de | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7063fbf2 JB |
2 | /* -*- mode: c; c-basic-offset: 8; -*- |
3 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
4 | * | |
5 | * file.c - operations for regular (text) files. | |
6 | * | |
7063fbf2 JB |
7 | * Based on sysfs: |
8 | * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel | |
9 | * | |
10 | * configfs Copyright (C) 2005 Oracle. All rights reserved. | |
11 | */ | |
12 | ||
13 | #include <linux/fs.h> | |
14 | #include <linux/module.h> | |
7063fbf2 | 15 | #include <linux/slab.h> |
6d748924 | 16 | #include <linux/mutex.h> |
03607ace | 17 | #include <linux/vmalloc.h> |
7c0f6ba6 | 18 | #include <linux/uaccess.h> |
7063fbf2 JB |
19 | |
20 | #include <linux/configfs.h> | |
21 | #include "configfs_internal.h" | |
22 | ||
b23cdde4 JB |
23 | /* |
24 | * A simple attribute can only be 4096 characters. Why 4k? Because the | |
25 | * original code limited it to PAGE_SIZE. That's a bad idea, though, | |
26 | * because an attribute of 16k on ia64 won't work on x86. So we limit to | |
27 | * 4k, our minimum common page size. | |
28 | */ | |
29 | #define SIMPLE_ATTR_SIZE 4096 | |
7063fbf2 JB |
30 | |
31 | struct configfs_buffer { | |
32 | size_t count; | |
33 | loff_t pos; | |
34 | char * page; | |
35 | struct configfs_item_operations * ops; | |
6d748924 | 36 | struct mutex mutex; |
7063fbf2 | 37 | int needs_read_fill; |
03607ace PA |
38 | bool read_in_progress; |
39 | bool write_in_progress; | |
40 | char *bin_buffer; | |
41 | int bin_buffer_size; | |
7063fbf2 JB |
42 | }; |
43 | ||
44 | ||
45 | /** | |
46 | * fill_read_buffer - allocate and fill buffer from item. | |
47 | * @dentry: dentry pointer. | |
48 | * @buffer: data buffer for file. | |
49 | * | |
50 | * Allocate @buffer->page, if it hasn't been already, then call the | |
51 | * config_item's show() method to fill the buffer with this attribute's | |
52 | * data. | |
53 | * This is called only once, on the file's first read. | |
54 | */ | |
55 | static int fill_read_buffer(struct dentry * dentry, struct configfs_buffer * buffer) | |
56 | { | |
57 | struct configfs_attribute * attr = to_attr(dentry); | |
58 | struct config_item * item = to_item(dentry->d_parent); | |
7063fbf2 JB |
59 | int ret = 0; |
60 | ssize_t count; | |
61 | ||
62 | if (!buffer->page) | |
63 | buffer->page = (char *) get_zeroed_page(GFP_KERNEL); | |
64 | if (!buffer->page) | |
65 | return -ENOMEM; | |
66 | ||
51798222 | 67 | count = attr->show(item, buffer->page); |
870823e6 | 68 | |
b23cdde4 | 69 | BUG_ON(count > (ssize_t)SIMPLE_ATTR_SIZE); |
3dc3afad TS |
70 | if (count >= 0) { |
71 | buffer->needs_read_fill = 0; | |
7063fbf2 | 72 | buffer->count = count; |
3dc3afad | 73 | } else |
7063fbf2 JB |
74 | ret = count; |
75 | return ret; | |
76 | } | |
77 | ||
7063fbf2 JB |
78 | /** |
79 | * configfs_read_file - read an attribute. | |
80 | * @file: file pointer. | |
81 | * @buf: buffer to fill. | |
82 | * @count: number of bytes to read. | |
83 | * @ppos: starting offset in file. | |
84 | * | |
85 | * Userspace wants to read an attribute file. The attribute descriptor | |
86 | * is in the file's ->d_fsdata. The target item is in the directory's | |
87 | * ->d_fsdata. | |
88 | * | |
89 | * We call fill_read_buffer() to allocate and fill the buffer from the | |
90 | * item's show() method exactly once (if the read is happening from | |
91 | * the beginning of the file). That should fill the entire buffer with | |
92 | * all the data the item has to offer for that attribute. | |
93 | * We then call flush_read_buffer() to copy the buffer to userspace | |
94 | * in the increments specified. | |
95 | */ | |
96 | ||
97 | static ssize_t | |
98 | configfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
99 | { | |
100 | struct configfs_buffer * buffer = file->private_data; | |
101 | ssize_t retval = 0; | |
102 | ||
6d748924 | 103 | mutex_lock(&buffer->mutex); |
7063fbf2 | 104 | if (buffer->needs_read_fill) { |
867fa491 | 105 | if ((retval = fill_read_buffer(file->f_path.dentry,buffer))) |
7063fbf2 JB |
106 | goto out; |
107 | } | |
4779efca | 108 | pr_debug("%s: count = %zd, ppos = %lld, buf = %s\n", |
8e24eea7 | 109 | __func__, count, *ppos, buffer->page); |
92f4c701 AM |
110 | retval = simple_read_from_buffer(buf, count, ppos, buffer->page, |
111 | buffer->count); | |
7063fbf2 | 112 | out: |
6d748924 | 113 | mutex_unlock(&buffer->mutex); |
7063fbf2 JB |
114 | return retval; |
115 | } | |
116 | ||
03607ace PA |
117 | /** |
118 | * configfs_read_bin_file - read a binary attribute. | |
119 | * @file: file pointer. | |
120 | * @buf: buffer to fill. | |
121 | * @count: number of bytes to read. | |
122 | * @ppos: starting offset in file. | |
123 | * | |
124 | * Userspace wants to read a binary attribute file. The attribute | |
125 | * descriptor is in the file's ->d_fsdata. The target item is in the | |
126 | * directory's ->d_fsdata. | |
127 | * | |
128 | * We check whether we need to refill the buffer. If so we will | |
129 | * call the attributes' attr->read() twice. The first time we | |
130 | * will pass a NULL as a buffer pointer, which the attributes' method | |
131 | * will use to return the size of the buffer required. If no error | |
132 | * occurs we will allocate the buffer using vmalloc and call | |
133 | * attr->read() again passing that buffer as an argument. | |
134 | * Then we just copy to user-space using simple_read_from_buffer. | |
135 | */ | |
136 | ||
137 | static ssize_t | |
138 | configfs_read_bin_file(struct file *file, char __user *buf, | |
139 | size_t count, loff_t *ppos) | |
140 | { | |
141 | struct configfs_buffer *buffer = file->private_data; | |
142 | struct dentry *dentry = file->f_path.dentry; | |
143 | struct config_item *item = to_item(dentry->d_parent); | |
144 | struct configfs_bin_attribute *bin_attr = to_bin_attr(dentry); | |
145 | ssize_t retval = 0; | |
146 | ssize_t len = min_t(size_t, count, PAGE_SIZE); | |
147 | ||
148 | mutex_lock(&buffer->mutex); | |
149 | ||
150 | /* we don't support switching read/write modes */ | |
151 | if (buffer->write_in_progress) { | |
152 | retval = -ETXTBSY; | |
153 | goto out; | |
154 | } | |
3f6928c3 | 155 | buffer->read_in_progress = true; |
03607ace PA |
156 | |
157 | if (buffer->needs_read_fill) { | |
158 | /* perform first read with buf == NULL to get extent */ | |
159 | len = bin_attr->read(item, NULL, 0); | |
160 | if (len <= 0) { | |
161 | retval = len; | |
162 | goto out; | |
163 | } | |
164 | ||
165 | /* do not exceed the maximum value */ | |
166 | if (bin_attr->cb_max_size && len > bin_attr->cb_max_size) { | |
167 | retval = -EFBIG; | |
168 | goto out; | |
169 | } | |
170 | ||
171 | buffer->bin_buffer = vmalloc(len); | |
172 | if (buffer->bin_buffer == NULL) { | |
173 | retval = -ENOMEM; | |
174 | goto out; | |
175 | } | |
176 | buffer->bin_buffer_size = len; | |
177 | ||
178 | /* perform second read to fill buffer */ | |
179 | len = bin_attr->read(item, buffer->bin_buffer, len); | |
180 | if (len < 0) { | |
181 | retval = len; | |
182 | vfree(buffer->bin_buffer); | |
183 | buffer->bin_buffer_size = 0; | |
184 | buffer->bin_buffer = NULL; | |
185 | goto out; | |
186 | } | |
187 | ||
188 | buffer->needs_read_fill = 0; | |
189 | } | |
190 | ||
191 | retval = simple_read_from_buffer(buf, count, ppos, buffer->bin_buffer, | |
192 | buffer->bin_buffer_size); | |
193 | out: | |
194 | mutex_unlock(&buffer->mutex); | |
195 | return retval; | |
196 | } | |
197 | ||
7063fbf2 JB |
198 | |
199 | /** | |
200 | * fill_write_buffer - copy buffer from userspace. | |
201 | * @buffer: data buffer for file. | |
3d0f89bb | 202 | * @buf: data from user. |
7063fbf2 JB |
203 | * @count: number of bytes in @userbuf. |
204 | * | |
205 | * Allocate @buffer->page if it hasn't been already, then | |
206 | * copy the user-supplied buffer into it. | |
207 | */ | |
208 | ||
209 | static int | |
210 | fill_write_buffer(struct configfs_buffer * buffer, const char __user * buf, size_t count) | |
211 | { | |
212 | int error; | |
213 | ||
214 | if (!buffer->page) | |
ff05d1c4 | 215 | buffer->page = (char *)__get_free_pages(GFP_KERNEL, 0); |
7063fbf2 JB |
216 | if (!buffer->page) |
217 | return -ENOMEM; | |
218 | ||
b23cdde4 JB |
219 | if (count >= SIMPLE_ATTR_SIZE) |
220 | count = SIMPLE_ATTR_SIZE - 1; | |
7063fbf2 JB |
221 | error = copy_from_user(buffer->page,buf,count); |
222 | buffer->needs_read_fill = 1; | |
ff05d1c4 JB |
223 | /* if buf is assumed to contain a string, terminate it by \0, |
224 | * so e.g. sscanf() can scan the string easily */ | |
225 | buffer->page[count] = 0; | |
7063fbf2 JB |
226 | return error ? -EFAULT : count; |
227 | } | |
228 | ||
229 | ||
230 | /** | |
231 | * flush_write_buffer - push buffer to config_item. | |
3d0f89bb | 232 | * @dentry: dentry to the attribute |
7063fbf2 | 233 | * @buffer: data buffer for file. |
3d0f89bb | 234 | * @count: number of bytes |
7063fbf2 JB |
235 | * |
236 | * Get the correct pointers for the config_item and the attribute we're | |
237 | * dealing with, then call the store() method for the attribute, | |
238 | * passing the buffer that we acquired in fill_write_buffer(). | |
239 | */ | |
240 | ||
241 | static int | |
242 | flush_write_buffer(struct dentry * dentry, struct configfs_buffer * buffer, size_t count) | |
243 | { | |
244 | struct configfs_attribute * attr = to_attr(dentry); | |
245 | struct config_item * item = to_item(dentry->d_parent); | |
7063fbf2 | 246 | |
870823e6 | 247 | return attr->store(item, buffer->page, count); |
7063fbf2 JB |
248 | } |
249 | ||
250 | ||
251 | /** | |
252 | * configfs_write_file - write an attribute. | |
253 | * @file: file pointer | |
254 | * @buf: data to write | |
255 | * @count: number of bytes | |
256 | * @ppos: starting offset | |
257 | * | |
258 | * Similar to configfs_read_file(), though working in the opposite direction. | |
259 | * We allocate and fill the data from the user in fill_write_buffer(), | |
260 | * then push it to the config_item in flush_write_buffer(). | |
261 | * There is no easy way for us to know if userspace is only doing a partial | |
262 | * write, so we don't support them. We expect the entire buffer to come | |
263 | * on the first write. | |
264 | * Hint: if you're writing a value, first read the file, modify only the | |
265 | * the value you're changing, then write entire buffer back. | |
266 | */ | |
267 | ||
268 | static ssize_t | |
269 | configfs_write_file(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
270 | { | |
271 | struct configfs_buffer * buffer = file->private_data; | |
3d0f89bb | 272 | ssize_t len; |
7063fbf2 | 273 | |
6d748924 | 274 | mutex_lock(&buffer->mutex); |
3d0f89bb JB |
275 | len = fill_write_buffer(buffer, buf, count); |
276 | if (len > 0) | |
7121064b | 277 | len = flush_write_buffer(file->f_path.dentry, buffer, len); |
3d0f89bb JB |
278 | if (len > 0) |
279 | *ppos += len; | |
6d748924 | 280 | mutex_unlock(&buffer->mutex); |
3d0f89bb | 281 | return len; |
7063fbf2 JB |
282 | } |
283 | ||
03607ace PA |
284 | /** |
285 | * configfs_write_bin_file - write a binary attribute. | |
286 | * @file: file pointer | |
287 | * @buf: data to write | |
288 | * @count: number of bytes | |
289 | * @ppos: starting offset | |
290 | * | |
291 | * Writing to a binary attribute file is similar to a normal read. | |
292 | * We buffer the consecutive writes (binary attribute files do not | |
293 | * support lseek) in a continuously growing buffer, but we don't | |
294 | * commit until the close of the file. | |
295 | */ | |
296 | ||
297 | static ssize_t | |
298 | configfs_write_bin_file(struct file *file, const char __user *buf, | |
299 | size_t count, loff_t *ppos) | |
300 | { | |
301 | struct configfs_buffer *buffer = file->private_data; | |
302 | struct dentry *dentry = file->f_path.dentry; | |
303 | struct configfs_bin_attribute *bin_attr = to_bin_attr(dentry); | |
304 | void *tbuf = NULL; | |
305 | ssize_t len; | |
306 | ||
307 | mutex_lock(&buffer->mutex); | |
308 | ||
309 | /* we don't support switching read/write modes */ | |
310 | if (buffer->read_in_progress) { | |
311 | len = -ETXTBSY; | |
312 | goto out; | |
313 | } | |
3f6928c3 | 314 | buffer->write_in_progress = true; |
03607ace PA |
315 | |
316 | /* buffer grows? */ | |
317 | if (*ppos + count > buffer->bin_buffer_size) { | |
318 | ||
319 | if (bin_attr->cb_max_size && | |
320 | *ppos + count > bin_attr->cb_max_size) { | |
321 | len = -EFBIG; | |
42857cf5 | 322 | goto out; |
03607ace PA |
323 | } |
324 | ||
325 | tbuf = vmalloc(*ppos + count); | |
326 | if (tbuf == NULL) { | |
327 | len = -ENOMEM; | |
328 | goto out; | |
329 | } | |
330 | ||
331 | /* copy old contents */ | |
332 | if (buffer->bin_buffer) { | |
333 | memcpy(tbuf, buffer->bin_buffer, | |
334 | buffer->bin_buffer_size); | |
335 | vfree(buffer->bin_buffer); | |
336 | } | |
337 | ||
338 | /* clear the new area */ | |
339 | memset(tbuf + buffer->bin_buffer_size, 0, | |
340 | *ppos + count - buffer->bin_buffer_size); | |
341 | buffer->bin_buffer = tbuf; | |
342 | buffer->bin_buffer_size = *ppos + count; | |
343 | } | |
344 | ||
345 | len = simple_write_to_buffer(buffer->bin_buffer, | |
346 | buffer->bin_buffer_size, ppos, buf, count); | |
03607ace PA |
347 | out: |
348 | mutex_unlock(&buffer->mutex); | |
349 | return len; | |
350 | } | |
351 | ||
352 | static int check_perm(struct inode * inode, struct file * file, int type) | |
7063fbf2 | 353 | { |
867fa491 JJS |
354 | struct config_item *item = configfs_get_config_item(file->f_path.dentry->d_parent); |
355 | struct configfs_attribute * attr = to_attr(file->f_path.dentry); | |
03607ace | 356 | struct configfs_bin_attribute *bin_attr = NULL; |
7063fbf2 JB |
357 | struct configfs_buffer * buffer; |
358 | struct configfs_item_operations * ops = NULL; | |
359 | int error = 0; | |
360 | ||
361 | if (!item || !attr) | |
362 | goto Einval; | |
363 | ||
03607ace PA |
364 | if (type & CONFIGFS_ITEM_BIN_ATTR) |
365 | bin_attr = to_bin_attr(file->f_path.dentry); | |
366 | ||
7063fbf2 JB |
367 | /* Grab the module reference for this attribute if we have one */ |
368 | if (!try_module_get(attr->ca_owner)) { | |
369 | error = -ENODEV; | |
370 | goto Done; | |
371 | } | |
372 | ||
373 | if (item->ci_type) | |
374 | ops = item->ci_type->ct_item_ops; | |
375 | else | |
376 | goto Eaccess; | |
377 | ||
378 | /* File needs write support. | |
379 | * The inode's perms must say it's ok, | |
380 | * and we must have a store method. | |
381 | */ | |
382 | if (file->f_mode & FMODE_WRITE) { | |
03607ace PA |
383 | if (!(inode->i_mode & S_IWUGO)) |
384 | goto Eaccess; | |
385 | ||
386 | if ((type & CONFIGFS_ITEM_ATTR) && !attr->store) | |
7063fbf2 JB |
387 | goto Eaccess; |
388 | ||
03607ace PA |
389 | if ((type & CONFIGFS_ITEM_BIN_ATTR) && !bin_attr->write) |
390 | goto Eaccess; | |
7063fbf2 JB |
391 | } |
392 | ||
393 | /* File needs read support. | |
394 | * The inode's perms must say it's ok, and we there | |
395 | * must be a show method for it. | |
396 | */ | |
397 | if (file->f_mode & FMODE_READ) { | |
03607ace PA |
398 | if (!(inode->i_mode & S_IRUGO)) |
399 | goto Eaccess; | |
400 | ||
401 | if ((type & CONFIGFS_ITEM_ATTR) && !attr->show) | |
402 | goto Eaccess; | |
403 | ||
404 | if ((type & CONFIGFS_ITEM_BIN_ATTR) && !bin_attr->read) | |
7063fbf2 JB |
405 | goto Eaccess; |
406 | } | |
407 | ||
408 | /* No error? Great, allocate a buffer for the file, and store it | |
409 | * it in file->private_data for easy access. | |
410 | */ | |
f8314dc6 | 411 | buffer = kzalloc(sizeof(struct configfs_buffer),GFP_KERNEL); |
559c9ac3 | 412 | if (!buffer) { |
7063fbf2 | 413 | error = -ENOMEM; |
559c9ac3 CS |
414 | goto Enomem; |
415 | } | |
6d748924 | 416 | mutex_init(&buffer->mutex); |
559c9ac3 | 417 | buffer->needs_read_fill = 1; |
3f6928c3 TM |
418 | buffer->read_in_progress = false; |
419 | buffer->write_in_progress = false; | |
559c9ac3 CS |
420 | buffer->ops = ops; |
421 | file->private_data = buffer; | |
7063fbf2 JB |
422 | goto Done; |
423 | ||
424 | Einval: | |
425 | error = -EINVAL; | |
426 | goto Done; | |
427 | Eaccess: | |
428 | error = -EACCES; | |
559c9ac3 | 429 | Enomem: |
7063fbf2 JB |
430 | module_put(attr->ca_owner); |
431 | Done: | |
432 | if (error && item) | |
433 | config_item_put(item); | |
434 | return error; | |
435 | } | |
436 | ||
03607ace | 437 | static int configfs_release(struct inode *inode, struct file *filp) |
7063fbf2 | 438 | { |
867fa491 JJS |
439 | struct config_item * item = to_item(filp->f_path.dentry->d_parent); |
440 | struct configfs_attribute * attr = to_attr(filp->f_path.dentry); | |
7063fbf2 JB |
441 | struct module * owner = attr->ca_owner; |
442 | struct configfs_buffer * buffer = filp->private_data; | |
443 | ||
444 | if (item) | |
445 | config_item_put(item); | |
446 | /* After this point, attr should not be accessed. */ | |
447 | module_put(owner); | |
448 | ||
449 | if (buffer) { | |
450 | if (buffer->page) | |
451 | free_page((unsigned long)buffer->page); | |
6d748924 | 452 | mutex_destroy(&buffer->mutex); |
7063fbf2 JB |
453 | kfree(buffer); |
454 | } | |
455 | return 0; | |
456 | } | |
457 | ||
03607ace PA |
458 | static int configfs_open_file(struct inode *inode, struct file *filp) |
459 | { | |
460 | return check_perm(inode, filp, CONFIGFS_ITEM_ATTR); | |
461 | } | |
462 | ||
463 | static int configfs_open_bin_file(struct inode *inode, struct file *filp) | |
464 | { | |
465 | return check_perm(inode, filp, CONFIGFS_ITEM_BIN_ATTR); | |
466 | } | |
467 | ||
468 | static int configfs_release_bin_file(struct inode *inode, struct file *filp) | |
469 | { | |
470 | struct configfs_buffer *buffer = filp->private_data; | |
471 | struct dentry *dentry = filp->f_path.dentry; | |
472 | struct config_item *item = to_item(dentry->d_parent); | |
473 | struct configfs_bin_attribute *bin_attr = to_bin_attr(dentry); | |
474 | ssize_t len = 0; | |
475 | int ret; | |
476 | ||
3f6928c3 | 477 | buffer->read_in_progress = false; |
03607ace PA |
478 | |
479 | if (buffer->write_in_progress) { | |
3f6928c3 | 480 | buffer->write_in_progress = false; |
03607ace PA |
481 | |
482 | len = bin_attr->write(item, buffer->bin_buffer, | |
483 | buffer->bin_buffer_size); | |
484 | ||
485 | /* vfree on NULL is safe */ | |
486 | vfree(buffer->bin_buffer); | |
487 | buffer->bin_buffer = NULL; | |
488 | buffer->bin_buffer_size = 0; | |
489 | buffer->needs_read_fill = 1; | |
490 | } | |
491 | ||
492 | ret = configfs_release(inode, filp); | |
493 | if (len < 0) | |
494 | return len; | |
495 | return ret; | |
496 | } | |
497 | ||
498 | ||
4b6f5d20 | 499 | const struct file_operations configfs_file_operations = { |
7063fbf2 JB |
500 | .read = configfs_read_file, |
501 | .write = configfs_write_file, | |
502 | .llseek = generic_file_llseek, | |
503 | .open = configfs_open_file, | |
504 | .release = configfs_release, | |
505 | }; | |
506 | ||
03607ace PA |
507 | const struct file_operations configfs_bin_file_operations = { |
508 | .read = configfs_read_bin_file, | |
509 | .write = configfs_write_bin_file, | |
510 | .llseek = NULL, /* bin file is not seekable */ | |
511 | .open = configfs_open_bin_file, | |
512 | .release = configfs_release_bin_file, | |
513 | }; | |
514 | ||
7063fbf2 JB |
515 | /** |
516 | * configfs_create_file - create an attribute file for an item. | |
517 | * @item: item we're creating for. | |
518 | * @attr: atrribute descriptor. | |
519 | */ | |
520 | ||
521 | int configfs_create_file(struct config_item * item, const struct configfs_attribute * attr) | |
522 | { | |
28444a2b AV |
523 | struct dentry *dir = item->ci_dentry; |
524 | struct configfs_dirent *parent_sd = dir->d_fsdata; | |
525 | umode_t mode = (attr->ca_mode & S_IALLUGO) | S_IFREG; | |
526 | int error = 0; | |
7063fbf2 | 527 | |
5955102c | 528 | inode_lock_nested(d_inode(dir), I_MUTEX_NORMAL); |
28444a2b AV |
529 | error = configfs_make_dirent(parent_sd, NULL, (void *) attr, mode, |
530 | CONFIGFS_ITEM_ATTR); | |
5955102c | 531 | inode_unlock(d_inode(dir)); |
28444a2b AV |
532 | |
533 | return error; | |
7063fbf2 JB |
534 | } |
535 | ||
03607ace PA |
536 | /** |
537 | * configfs_create_bin_file - create a binary attribute file for an item. | |
538 | * @item: item we're creating for. | |
539 | * @attr: atrribute descriptor. | |
540 | */ | |
541 | ||
542 | int configfs_create_bin_file(struct config_item *item, | |
543 | const struct configfs_bin_attribute *bin_attr) | |
544 | { | |
545 | struct dentry *dir = item->ci_dentry; | |
546 | struct configfs_dirent *parent_sd = dir->d_fsdata; | |
547 | umode_t mode = (bin_attr->cb_attr.ca_mode & S_IALLUGO) | S_IFREG; | |
548 | int error = 0; | |
549 | ||
5955102c | 550 | inode_lock_nested(dir->d_inode, I_MUTEX_NORMAL); |
03607ace PA |
551 | error = configfs_make_dirent(parent_sd, NULL, (void *) bin_attr, mode, |
552 | CONFIGFS_ITEM_BIN_ATTR); | |
5955102c | 553 | inode_unlock(dir->d_inode); |
03607ace PA |
554 | |
555 | return error; | |
556 | } |