]>
Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
bd33d12f | 2 | * inode.c - part of debugfs, a tiny little debug file system |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com> | |
5 | * Copyright (C) 2004 IBM Inc. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License version | |
9 | * 2 as published by the Free Software Foundation. | |
10 | * | |
11 | * debugfs is for people to use instead of /proc or /sys. | |
12 | * See Documentation/DocBook/kernel-api for more details. | |
13 | * | |
14 | */ | |
15 | ||
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/fs.h> | |
18 | #include <linux/mount.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/init.h> | |
4d8ebddc | 21 | #include <linux/kobject.h> |
1da177e4 LT |
22 | #include <linux/namei.h> |
23 | #include <linux/debugfs.h> | |
4f36557f | 24 | #include <linux/fsnotify.h> |
66f54963 | 25 | #include <linux/string.h> |
92562927 | 26 | #include <linux/magic.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
1da177e4 | 28 | |
1da177e4 LT |
29 | static struct vfsmount *debugfs_mount; |
30 | static int debugfs_mount_count; | |
c0f92ba9 | 31 | static bool debugfs_registered; |
1da177e4 | 32 | |
f4ae40a6 | 33 | static struct inode *debugfs_get_inode(struct super_block *sb, umode_t mode, dev_t dev, |
d3a3b0ad MD |
34 | void *data, const struct file_operations *fops) |
35 | ||
1da177e4 LT |
36 | { |
37 | struct inode *inode = new_inode(sb); | |
38 | ||
39 | if (inode) { | |
85fe4025 | 40 | inode->i_ino = get_next_ino(); |
1da177e4 | 41 | inode->i_mode = mode; |
1da177e4 LT |
42 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
43 | switch (mode & S_IFMT) { | |
44 | default: | |
45 | init_special_inode(inode, mode, dev); | |
46 | break; | |
47 | case S_IFREG: | |
d3a3b0ad MD |
48 | inode->i_fop = fops ? fops : &debugfs_file_operations; |
49 | inode->i_private = data; | |
1da177e4 | 50 | break; |
66f54963 PO |
51 | case S_IFLNK: |
52 | inode->i_op = &debugfs_link_operations; | |
d3a3b0ad MD |
53 | inode->i_fop = fops; |
54 | inode->i_private = data; | |
66f54963 | 55 | break; |
1da177e4 LT |
56 | case S_IFDIR: |
57 | inode->i_op = &simple_dir_inode_operations; | |
d3a3b0ad MD |
58 | inode->i_fop = fops ? fops : &simple_dir_operations; |
59 | inode->i_private = data; | |
1da177e4 | 60 | |
bafb232e MD |
61 | /* directory inodes start off with i_nlink == 2 |
62 | * (for "." entry) */ | |
d8c76e6f | 63 | inc_nlink(inode); |
1da177e4 LT |
64 | break; |
65 | } | |
66 | } | |
67 | return inode; | |
68 | } | |
69 | ||
70 | /* SMP-safe */ | |
71 | static int debugfs_mknod(struct inode *dir, struct dentry *dentry, | |
f4ae40a6 | 72 | umode_t mode, dev_t dev, void *data, |
d3a3b0ad | 73 | const struct file_operations *fops) |
1da177e4 | 74 | { |
71601e2b | 75 | struct inode *inode; |
1da177e4 LT |
76 | int error = -EPERM; |
77 | ||
78 | if (dentry->d_inode) | |
79 | return -EEXIST; | |
80 | ||
d3a3b0ad | 81 | inode = debugfs_get_inode(dir->i_sb, mode, dev, data, fops); |
1da177e4 LT |
82 | if (inode) { |
83 | d_instantiate(dentry, inode); | |
84 | dget(dentry); | |
85 | error = 0; | |
86 | } | |
87 | return error; | |
88 | } | |
89 | ||
f4ae40a6 | 90 | static int debugfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, |
d3a3b0ad | 91 | void *data, const struct file_operations *fops) |
1da177e4 LT |
92 | { |
93 | int res; | |
94 | ||
95 | mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR; | |
d3a3b0ad | 96 | res = debugfs_mknod(dir, dentry, mode, 0, data, fops); |
4f36557f | 97 | if (!res) { |
d8c76e6f | 98 | inc_nlink(dir); |
4f36557f MD |
99 | fsnotify_mkdir(dir, dentry); |
100 | } | |
1da177e4 LT |
101 | return res; |
102 | } | |
103 | ||
f4ae40a6 | 104 | static int debugfs_link(struct inode *dir, struct dentry *dentry, umode_t mode, |
d3a3b0ad | 105 | void *data, const struct file_operations *fops) |
66f54963 PO |
106 | { |
107 | mode = (mode & S_IALLUGO) | S_IFLNK; | |
d3a3b0ad | 108 | return debugfs_mknod(dir, dentry, mode, 0, data, fops); |
66f54963 PO |
109 | } |
110 | ||
f4ae40a6 | 111 | static int debugfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
d3a3b0ad | 112 | void *data, const struct file_operations *fops) |
1da177e4 | 113 | { |
4f36557f MD |
114 | int res; |
115 | ||
1da177e4 | 116 | mode = (mode & S_IALLUGO) | S_IFREG; |
d3a3b0ad | 117 | res = debugfs_mknod(dir, dentry, mode, 0, data, fops); |
4f36557f MD |
118 | if (!res) |
119 | fsnotify_create(dir, dentry); | |
120 | return res; | |
1da177e4 LT |
121 | } |
122 | ||
123 | static inline int debugfs_positive(struct dentry *dentry) | |
124 | { | |
125 | return dentry->d_inode && !d_unhashed(dentry); | |
126 | } | |
127 | ||
128 | static int debug_fill_super(struct super_block *sb, void *data, int silent) | |
129 | { | |
130 | static struct tree_descr debug_files[] = {{""}}; | |
131 | ||
132 | return simple_fill_super(sb, DEBUGFS_MAGIC, debug_files); | |
133 | } | |
134 | ||
fc14f2fe | 135 | static struct dentry *debug_mount(struct file_system_type *fs_type, |
454e2398 | 136 | int flags, const char *dev_name, |
fc14f2fe | 137 | void *data) |
1da177e4 | 138 | { |
fc14f2fe | 139 | return mount_single(fs_type, flags, data, debug_fill_super); |
1da177e4 LT |
140 | } |
141 | ||
142 | static struct file_system_type debug_fs_type = { | |
143 | .owner = THIS_MODULE, | |
144 | .name = "debugfs", | |
fc14f2fe | 145 | .mount = debug_mount, |
1da177e4 LT |
146 | .kill_sb = kill_litter_super, |
147 | }; | |
148 | ||
f4ae40a6 | 149 | static int debugfs_create_by_name(const char *name, umode_t mode, |
1da177e4 | 150 | struct dentry *parent, |
d3a3b0ad MD |
151 | struct dentry **dentry, |
152 | void *data, | |
153 | const struct file_operations *fops) | |
1da177e4 LT |
154 | { |
155 | int error = 0; | |
156 | ||
157 | /* If the parent is not specified, we create it in the root. | |
158 | * We need the root dentry to do this, which is in the super | |
159 | * block. A pointer to that is in the struct vfsmount that we | |
160 | * have around. | |
161 | */ | |
ef52c75e | 162 | if (!parent) |
4c1d5a64 | 163 | parent = debugfs_mount->mnt_root; |
1da177e4 LT |
164 | |
165 | *dentry = NULL; | |
1b1dcc1b | 166 | mutex_lock(&parent->d_inode->i_mutex); |
5f45f1a7 | 167 | *dentry = lookup_one_len(name, parent, strlen(name)); |
7bb0386f | 168 | if (!IS_ERR(*dentry)) { |
66f54963 PO |
169 | switch (mode & S_IFMT) { |
170 | case S_IFDIR: | |
d3a3b0ad MD |
171 | error = debugfs_mkdir(parent->d_inode, *dentry, mode, |
172 | data, fops); | |
66f54963 PO |
173 | break; |
174 | case S_IFLNK: | |
d3a3b0ad MD |
175 | error = debugfs_link(parent->d_inode, *dentry, mode, |
176 | data, fops); | |
66f54963 PO |
177 | break; |
178 | default: | |
d3a3b0ad MD |
179 | error = debugfs_create(parent->d_inode, *dentry, mode, |
180 | data, fops); | |
66f54963 PO |
181 | break; |
182 | } | |
65c33336 | 183 | dput(*dentry); |
1da177e4 | 184 | } else |
7bb0386f | 185 | error = PTR_ERR(*dentry); |
1b1dcc1b | 186 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 LT |
187 | |
188 | return error; | |
189 | } | |
190 | ||
191 | /** | |
192 | * debugfs_create_file - create a file in the debugfs filesystem | |
1da177e4 | 193 | * @name: a pointer to a string containing the name of the file to create. |
be030e65 | 194 | * @mode: the permission that the file should have. |
1da177e4 LT |
195 | * @parent: a pointer to the parent dentry for this file. This should be a |
196 | * directory dentry if set. If this paramater is NULL, then the | |
197 | * file will be created in the root of the debugfs filesystem. | |
198 | * @data: a pointer to something that the caller will want to get to later | |
8e18e294 | 199 | * on. The inode.i_private pointer will point to this value on |
1da177e4 LT |
200 | * the open() call. |
201 | * @fops: a pointer to a struct file_operations that should be used for | |
202 | * this file. | |
203 | * | |
204 | * This is the basic "create a file" function for debugfs. It allows for a | |
be030e65 AB |
205 | * wide range of flexibility in creating a file, or a directory (if you want |
206 | * to create a directory, the debugfs_create_dir() function is | |
1da177e4 LT |
207 | * recommended to be used instead.) |
208 | * | |
209 | * This function will return a pointer to a dentry if it succeeds. This | |
210 | * pointer must be passed to the debugfs_remove() function when the file is | |
211 | * to be removed (no automatic cleanup happens if your module is unloaded, | |
6468b3af | 212 | * you are responsible here.) If an error occurs, %NULL will be returned. |
1da177e4 | 213 | * |
6468b3af | 214 | * If debugfs is not enabled in the kernel, the value -%ENODEV will be |
873760fb | 215 | * returned. |
1da177e4 | 216 | */ |
f4ae40a6 | 217 | struct dentry *debugfs_create_file(const char *name, umode_t mode, |
1da177e4 | 218 | struct dentry *parent, void *data, |
99ac48f5 | 219 | const struct file_operations *fops) |
1da177e4 LT |
220 | { |
221 | struct dentry *dentry = NULL; | |
222 | int error; | |
223 | ||
224 | pr_debug("debugfs: creating file '%s'\n",name); | |
225 | ||
63223a06 MD |
226 | error = simple_pin_fs(&debug_fs_type, &debugfs_mount, |
227 | &debugfs_mount_count); | |
1da177e4 LT |
228 | if (error) |
229 | goto exit; | |
230 | ||
d3a3b0ad MD |
231 | error = debugfs_create_by_name(name, mode, parent, &dentry, |
232 | data, fops); | |
1da177e4 LT |
233 | if (error) { |
234 | dentry = NULL; | |
63223a06 | 235 | simple_release_fs(&debugfs_mount, &debugfs_mount_count); |
1da177e4 LT |
236 | goto exit; |
237 | } | |
1da177e4 LT |
238 | exit: |
239 | return dentry; | |
240 | } | |
241 | EXPORT_SYMBOL_GPL(debugfs_create_file); | |
242 | ||
243 | /** | |
244 | * debugfs_create_dir - create a directory in the debugfs filesystem | |
1da177e4 LT |
245 | * @name: a pointer to a string containing the name of the directory to |
246 | * create. | |
247 | * @parent: a pointer to the parent dentry for this file. This should be a | |
248 | * directory dentry if set. If this paramater is NULL, then the | |
249 | * directory will be created in the root of the debugfs filesystem. | |
250 | * | |
251 | * This function creates a directory in debugfs with the given name. | |
252 | * | |
253 | * This function will return a pointer to a dentry if it succeeds. This | |
254 | * pointer must be passed to the debugfs_remove() function when the file is | |
255 | * to be removed (no automatic cleanup happens if your module is unloaded, | |
6468b3af | 256 | * you are responsible here.) If an error occurs, %NULL will be returned. |
1da177e4 | 257 | * |
6468b3af | 258 | * If debugfs is not enabled in the kernel, the value -%ENODEV will be |
873760fb | 259 | * returned. |
1da177e4 LT |
260 | */ |
261 | struct dentry *debugfs_create_dir(const char *name, struct dentry *parent) | |
262 | { | |
263 | return debugfs_create_file(name, | |
264 | S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO, | |
265 | parent, NULL, NULL); | |
266 | } | |
267 | EXPORT_SYMBOL_GPL(debugfs_create_dir); | |
268 | ||
66f54963 PO |
269 | /** |
270 | * debugfs_create_symlink- create a symbolic link in the debugfs filesystem | |
271 | * @name: a pointer to a string containing the name of the symbolic link to | |
272 | * create. | |
273 | * @parent: a pointer to the parent dentry for this symbolic link. This | |
274 | * should be a directory dentry if set. If this paramater is NULL, | |
275 | * then the symbolic link will be created in the root of the debugfs | |
276 | * filesystem. | |
277 | * @target: a pointer to a string containing the path to the target of the | |
278 | * symbolic link. | |
279 | * | |
280 | * This function creates a symbolic link with the given name in debugfs that | |
281 | * links to the given target path. | |
282 | * | |
283 | * This function will return a pointer to a dentry if it succeeds. This | |
284 | * pointer must be passed to the debugfs_remove() function when the symbolic | |
285 | * link is to be removed (no automatic cleanup happens if your module is | |
286 | * unloaded, you are responsible here.) If an error occurs, %NULL will be | |
287 | * returned. | |
288 | * | |
289 | * If debugfs is not enabled in the kernel, the value -%ENODEV will be | |
873760fb | 290 | * returned. |
66f54963 PO |
291 | */ |
292 | struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent, | |
293 | const char *target) | |
294 | { | |
295 | struct dentry *result; | |
296 | char *link; | |
297 | ||
298 | link = kstrdup(target, GFP_KERNEL); | |
299 | if (!link) | |
300 | return NULL; | |
301 | ||
302 | result = debugfs_create_file(name, S_IFLNK | S_IRWXUGO, parent, link, | |
303 | NULL); | |
304 | if (!result) | |
305 | kfree(link); | |
306 | return result; | |
307 | } | |
308 | EXPORT_SYMBOL_GPL(debugfs_create_symlink); | |
309 | ||
25d41d84 | 310 | static int __debugfs_remove(struct dentry *dentry, struct dentry *parent) |
9505e637 HS |
311 | { |
312 | int ret = 0; | |
313 | ||
314 | if (debugfs_positive(dentry)) { | |
315 | if (dentry->d_inode) { | |
316 | dget(dentry); | |
317 | switch (dentry->d_inode->i_mode & S_IFMT) { | |
318 | case S_IFDIR: | |
319 | ret = simple_rmdir(parent->d_inode, dentry); | |
320 | break; | |
321 | case S_IFLNK: | |
322 | kfree(dentry->d_inode->i_private); | |
323 | /* fall through */ | |
324 | default: | |
325 | simple_unlink(parent->d_inode, dentry); | |
326 | break; | |
327 | } | |
328 | if (!ret) | |
329 | d_delete(dentry); | |
330 | dput(dentry); | |
331 | } | |
332 | } | |
25d41d84 | 333 | return ret; |
9505e637 HS |
334 | } |
335 | ||
1da177e4 LT |
336 | /** |
337 | * debugfs_remove - removes a file or directory from the debugfs filesystem | |
1da177e4 LT |
338 | * @dentry: a pointer to a the dentry of the file or directory to be |
339 | * removed. | |
340 | * | |
341 | * This function removes a file or directory in debugfs that was previously | |
342 | * created with a call to another debugfs function (like | |
5a65980e | 343 | * debugfs_create_file() or variants thereof.) |
1da177e4 LT |
344 | * |
345 | * This function is required to be called in order for the file to be | |
346 | * removed, no automatic cleanup of files will happen when a module is | |
347 | * removed, you are responsible here. | |
348 | */ | |
349 | void debugfs_remove(struct dentry *dentry) | |
350 | { | |
351 | struct dentry *parent; | |
25d41d84 JK |
352 | int ret; |
353 | ||
1da177e4 LT |
354 | if (!dentry) |
355 | return; | |
356 | ||
357 | parent = dentry->d_parent; | |
358 | if (!parent || !parent->d_inode) | |
359 | return; | |
360 | ||
1b1dcc1b | 361 | mutex_lock(&parent->d_inode->i_mutex); |
25d41d84 | 362 | ret = __debugfs_remove(dentry, parent); |
9505e637 | 363 | mutex_unlock(&parent->d_inode->i_mutex); |
25d41d84 JK |
364 | if (!ret) |
365 | simple_release_fs(&debugfs_mount, &debugfs_mount_count); | |
9505e637 HS |
366 | } |
367 | EXPORT_SYMBOL_GPL(debugfs_remove); | |
368 | ||
369 | /** | |
370 | * debugfs_remove_recursive - recursively removes a directory | |
371 | * @dentry: a pointer to a the dentry of the directory to be removed. | |
372 | * | |
373 | * This function recursively removes a directory tree in debugfs that | |
374 | * was previously created with a call to another debugfs function | |
375 | * (like debugfs_create_file() or variants thereof.) | |
376 | * | |
377 | * This function is required to be called in order for the file to be | |
378 | * removed, no automatic cleanup of files will happen when a module is | |
379 | * removed, you are responsible here. | |
380 | */ | |
381 | void debugfs_remove_recursive(struct dentry *dentry) | |
382 | { | |
383 | struct dentry *child; | |
384 | struct dentry *parent; | |
385 | ||
386 | if (!dentry) | |
387 | return; | |
388 | ||
389 | parent = dentry->d_parent; | |
390 | if (!parent || !parent->d_inode) | |
391 | return; | |
392 | ||
393 | parent = dentry; | |
394 | mutex_lock(&parent->d_inode->i_mutex); | |
395 | ||
396 | while (1) { | |
397 | /* | |
398 | * When all dentries under "parent" has been removed, | |
399 | * walk up the tree until we reach our starting point. | |
400 | */ | |
401 | if (list_empty(&parent->d_subdirs)) { | |
402 | mutex_unlock(&parent->d_inode->i_mutex); | |
403 | if (parent == dentry) | |
66f54963 | 404 | break; |
9505e637 HS |
405 | parent = parent->d_parent; |
406 | mutex_lock(&parent->d_inode->i_mutex); | |
407 | } | |
408 | child = list_entry(parent->d_subdirs.next, struct dentry, | |
409 | d_u.d_child); | |
56a83cc9 | 410 | next_sibling: |
9505e637 HS |
411 | |
412 | /* | |
413 | * If "child" isn't empty, walk down the tree and | |
414 | * remove all its descendants first. | |
415 | */ | |
416 | if (!list_empty(&child->d_subdirs)) { | |
417 | mutex_unlock(&parent->d_inode->i_mutex); | |
418 | parent = child; | |
419 | mutex_lock(&parent->d_inode->i_mutex); | |
420 | continue; | |
1da177e4 | 421 | } |
9505e637 HS |
422 | __debugfs_remove(child, parent); |
423 | if (parent->d_subdirs.next == &child->d_u.d_child) { | |
56a83cc9 SR |
424 | /* |
425 | * Try the next sibling. | |
426 | */ | |
427 | if (child->d_u.d_child.next != &parent->d_subdirs) { | |
428 | child = list_entry(child->d_u.d_child.next, | |
429 | struct dentry, | |
430 | d_u.d_child); | |
431 | goto next_sibling; | |
432 | } | |
433 | ||
9505e637 HS |
434 | /* |
435 | * Avoid infinite loop if we fail to remove | |
436 | * one dentry. | |
437 | */ | |
438 | mutex_unlock(&parent->d_inode->i_mutex); | |
439 | break; | |
440 | } | |
441 | simple_release_fs(&debugfs_mount, &debugfs_mount_count); | |
1da177e4 | 442 | } |
9505e637 HS |
443 | |
444 | parent = dentry->d_parent; | |
445 | mutex_lock(&parent->d_inode->i_mutex); | |
446 | __debugfs_remove(dentry, parent); | |
1b1dcc1b | 447 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 LT |
448 | simple_release_fs(&debugfs_mount, &debugfs_mount_count); |
449 | } | |
9505e637 | 450 | EXPORT_SYMBOL_GPL(debugfs_remove_recursive); |
1da177e4 | 451 | |
cfc94cdf JK |
452 | /** |
453 | * debugfs_rename - rename a file/directory in the debugfs filesystem | |
454 | * @old_dir: a pointer to the parent dentry for the renamed object. This | |
455 | * should be a directory dentry. | |
456 | * @old_dentry: dentry of an object to be renamed. | |
457 | * @new_dir: a pointer to the parent dentry where the object should be | |
458 | * moved. This should be a directory dentry. | |
459 | * @new_name: a pointer to a string containing the target name. | |
460 | * | |
461 | * This function renames a file/directory in debugfs. The target must not | |
462 | * exist for rename to succeed. | |
463 | * | |
464 | * This function will return a pointer to old_dentry (which is updated to | |
465 | * reflect renaming) if it succeeds. If an error occurs, %NULL will be | |
466 | * returned. | |
467 | * | |
468 | * If debugfs is not enabled in the kernel, the value -%ENODEV will be | |
469 | * returned. | |
470 | */ | |
471 | struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry, | |
472 | struct dentry *new_dir, const char *new_name) | |
473 | { | |
474 | int error; | |
475 | struct dentry *dentry = NULL, *trap; | |
476 | const char *old_name; | |
477 | ||
478 | trap = lock_rename(new_dir, old_dir); | |
479 | /* Source or destination directories don't exist? */ | |
480 | if (!old_dir->d_inode || !new_dir->d_inode) | |
481 | goto exit; | |
482 | /* Source does not exist, cyclic rename, or mountpoint? */ | |
483 | if (!old_dentry->d_inode || old_dentry == trap || | |
484 | d_mountpoint(old_dentry)) | |
485 | goto exit; | |
486 | dentry = lookup_one_len(new_name, new_dir, strlen(new_name)); | |
487 | /* Lookup failed, cyclic rename or target exists? */ | |
488 | if (IS_ERR(dentry) || dentry == trap || dentry->d_inode) | |
489 | goto exit; | |
490 | ||
491 | old_name = fsnotify_oldname_init(old_dentry->d_name.name); | |
492 | ||
493 | error = simple_rename(old_dir->d_inode, old_dentry, new_dir->d_inode, | |
494 | dentry); | |
495 | if (error) { | |
496 | fsnotify_oldname_free(old_name); | |
497 | goto exit; | |
498 | } | |
499 | d_move(old_dentry, dentry); | |
500 | fsnotify_move(old_dir->d_inode, new_dir->d_inode, old_name, | |
123df294 | 501 | S_ISDIR(old_dentry->d_inode->i_mode), |
5a190ae6 | 502 | NULL, old_dentry); |
cfc94cdf JK |
503 | fsnotify_oldname_free(old_name); |
504 | unlock_rename(new_dir, old_dir); | |
505 | dput(dentry); | |
506 | return old_dentry; | |
507 | exit: | |
508 | if (dentry && !IS_ERR(dentry)) | |
509 | dput(dentry); | |
510 | unlock_rename(new_dir, old_dir); | |
511 | return NULL; | |
512 | } | |
513 | EXPORT_SYMBOL_GPL(debugfs_rename); | |
514 | ||
c0f92ba9 FW |
515 | /** |
516 | * debugfs_initialized - Tells whether debugfs has been registered | |
517 | */ | |
518 | bool debugfs_initialized(void) | |
519 | { | |
520 | return debugfs_registered; | |
521 | } | |
522 | EXPORT_SYMBOL_GPL(debugfs_initialized); | |
523 | ||
524 | ||
191e186b | 525 | static struct kobject *debug_kobj; |
1da177e4 LT |
526 | |
527 | static int __init debugfs_init(void) | |
528 | { | |
529 | int retval; | |
530 | ||
0ff21e46 | 531 | debug_kobj = kobject_create_and_add("debug", kernel_kobj); |
191e186b GKH |
532 | if (!debug_kobj) |
533 | return -EINVAL; | |
1da177e4 LT |
534 | |
535 | retval = register_filesystem(&debug_fs_type); | |
536 | if (retval) | |
197b12d6 | 537 | kobject_put(debug_kobj); |
c0f92ba9 FW |
538 | else |
539 | debugfs_registered = true; | |
540 | ||
1da177e4 LT |
541 | return retval; |
542 | } | |
1da177e4 | 543 | core_initcall(debugfs_init); |
1da177e4 | 544 |