Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * file.c - part of debugfs, a tiny little debug file system | |
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 | ||
16 | /* uncomment to get debug messages from the debug filesystem, ah the irony. */ | |
17 | /* #define DEBUG */ | |
18 | ||
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/mount.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/init.h> | |
4d8ebddc | 24 | #include <linux/kobject.h> |
1da177e4 LT |
25 | #include <linux/namei.h> |
26 | #include <linux/debugfs.h> | |
4f36557f | 27 | #include <linux/fsnotify.h> |
66f54963 | 28 | #include <linux/string.h> |
92562927 | 29 | #include <linux/magic.h> |
1da177e4 | 30 | |
1da177e4 LT |
31 | static struct vfsmount *debugfs_mount; |
32 | static int debugfs_mount_count; | |
c0f92ba9 | 33 | static bool debugfs_registered; |
1da177e4 | 34 | |
d3a3b0ad MD |
35 | static struct inode *debugfs_get_inode(struct super_block *sb, int mode, dev_t dev, |
36 | void *data, const struct file_operations *fops) | |
37 | ||
1da177e4 LT |
38 | { |
39 | struct inode *inode = new_inode(sb); | |
40 | ||
41 | if (inode) { | |
42 | inode->i_mode = mode; | |
1da177e4 LT |
43 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
44 | switch (mode & S_IFMT) { | |
45 | default: | |
46 | init_special_inode(inode, mode, dev); | |
47 | break; | |
48 | case S_IFREG: | |
d3a3b0ad MD |
49 | inode->i_fop = fops ? fops : &debugfs_file_operations; |
50 | inode->i_private = data; | |
1da177e4 | 51 | break; |
66f54963 PO |
52 | case S_IFLNK: |
53 | inode->i_op = &debugfs_link_operations; | |
d3a3b0ad MD |
54 | inode->i_fop = fops; |
55 | inode->i_private = data; | |
66f54963 | 56 | break; |
1da177e4 LT |
57 | case S_IFDIR: |
58 | inode->i_op = &simple_dir_inode_operations; | |
d3a3b0ad MD |
59 | inode->i_fop = fops ? fops : &simple_dir_operations; |
60 | inode->i_private = data; | |
1da177e4 | 61 | |
bafb232e MD |
62 | /* directory inodes start off with i_nlink == 2 |
63 | * (for "." entry) */ | |
d8c76e6f | 64 | inc_nlink(inode); |
1da177e4 LT |
65 | break; |
66 | } | |
67 | } | |
68 | return inode; | |
69 | } | |
70 | ||
71 | /* SMP-safe */ | |
72 | static int debugfs_mknod(struct inode *dir, struct dentry *dentry, | |
d3a3b0ad MD |
73 | int mode, dev_t dev, void *data, |
74 | const struct file_operations *fops) | |
1da177e4 | 75 | { |
71601e2b | 76 | struct inode *inode; |
1da177e4 LT |
77 | int error = -EPERM; |
78 | ||
79 | if (dentry->d_inode) | |
80 | return -EEXIST; | |
81 | ||
d3a3b0ad | 82 | inode = debugfs_get_inode(dir->i_sb, mode, dev, data, fops); |
1da177e4 LT |
83 | if (inode) { |
84 | d_instantiate(dentry, inode); | |
85 | dget(dentry); | |
86 | error = 0; | |
87 | } | |
88 | return error; | |
89 | } | |
90 | ||
d3a3b0ad MD |
91 | static int debugfs_mkdir(struct inode *dir, struct dentry *dentry, int mode, |
92 | void *data, const struct file_operations *fops) | |
1da177e4 LT |
93 | { |
94 | int res; | |
95 | ||
96 | mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR; | |
d3a3b0ad | 97 | res = debugfs_mknod(dir, dentry, mode, 0, data, fops); |
4f36557f | 98 | if (!res) { |
d8c76e6f | 99 | inc_nlink(dir); |
4f36557f MD |
100 | fsnotify_mkdir(dir, dentry); |
101 | } | |
1da177e4 LT |
102 | return res; |
103 | } | |
104 | ||
d3a3b0ad MD |
105 | static int debugfs_link(struct inode *dir, struct dentry *dentry, int mode, |
106 | void *data, const struct file_operations *fops) | |
66f54963 PO |
107 | { |
108 | mode = (mode & S_IALLUGO) | S_IFLNK; | |
d3a3b0ad | 109 | return debugfs_mknod(dir, dentry, mode, 0, data, fops); |
66f54963 PO |
110 | } |
111 | ||
d3a3b0ad MD |
112 | static int debugfs_create(struct inode *dir, struct dentry *dentry, int mode, |
113 | void *data, const struct file_operations *fops) | |
1da177e4 | 114 | { |
4f36557f MD |
115 | int res; |
116 | ||
1da177e4 | 117 | mode = (mode & S_IALLUGO) | S_IFREG; |
d3a3b0ad | 118 | res = debugfs_mknod(dir, dentry, mode, 0, data, fops); |
4f36557f MD |
119 | if (!res) |
120 | fsnotify_create(dir, dentry); | |
121 | return res; | |
1da177e4 LT |
122 | } |
123 | ||
124 | static inline int debugfs_positive(struct dentry *dentry) | |
125 | { | |
126 | return dentry->d_inode && !d_unhashed(dentry); | |
127 | } | |
128 | ||
129 | static int debug_fill_super(struct super_block *sb, void *data, int silent) | |
130 | { | |
131 | static struct tree_descr debug_files[] = {{""}}; | |
132 | ||
133 | return simple_fill_super(sb, DEBUGFS_MAGIC, debug_files); | |
134 | } | |
135 | ||
454e2398 DH |
136 | static int debug_get_sb(struct file_system_type *fs_type, |
137 | int flags, const char *dev_name, | |
138 | void *data, struct vfsmount *mnt) | |
1da177e4 | 139 | { |
454e2398 | 140 | return get_sb_single(fs_type, flags, data, debug_fill_super, mnt); |
1da177e4 LT |
141 | } |
142 | ||
143 | static struct file_system_type debug_fs_type = { | |
144 | .owner = THIS_MODULE, | |
145 | .name = "debugfs", | |
146 | .get_sb = debug_get_sb, | |
147 | .kill_sb = kill_litter_super, | |
148 | }; | |
149 | ||
150 | static int debugfs_create_by_name(const char *name, mode_t mode, | |
151 | struct dentry *parent, | |
d3a3b0ad MD |
152 | struct dentry **dentry, |
153 | void *data, | |
154 | const struct file_operations *fops) | |
1da177e4 LT |
155 | { |
156 | int error = 0; | |
157 | ||
158 | /* If the parent is not specified, we create it in the root. | |
159 | * We need the root dentry to do this, which is in the super | |
160 | * block. A pointer to that is in the struct vfsmount that we | |
161 | * have around. | |
162 | */ | |
ef52c75e AV |
163 | if (!parent) |
164 | parent = debugfs_mount->mnt_sb->s_root; | |
1da177e4 LT |
165 | |
166 | *dentry = NULL; | |
1b1dcc1b | 167 | mutex_lock(&parent->d_inode->i_mutex); |
5f45f1a7 | 168 | *dentry = lookup_one_len(name, parent, strlen(name)); |
7bb0386f | 169 | if (!IS_ERR(*dentry)) { |
66f54963 PO |
170 | switch (mode & S_IFMT) { |
171 | case S_IFDIR: | |
d3a3b0ad MD |
172 | error = debugfs_mkdir(parent->d_inode, *dentry, mode, |
173 | data, fops); | |
66f54963 PO |
174 | break; |
175 | case S_IFLNK: | |
d3a3b0ad MD |
176 | error = debugfs_link(parent->d_inode, *dentry, mode, |
177 | data, fops); | |
66f54963 PO |
178 | break; |
179 | default: | |
d3a3b0ad MD |
180 | error = debugfs_create(parent->d_inode, *dentry, mode, |
181 | data, fops); | |
66f54963 PO |
182 | break; |
183 | } | |
65c33336 | 184 | dput(*dentry); |
1da177e4 | 185 | } else |
7bb0386f | 186 | error = PTR_ERR(*dentry); |
1b1dcc1b | 187 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 LT |
188 | |
189 | return error; | |
190 | } | |
191 | ||
192 | /** | |
193 | * debugfs_create_file - create a file in the debugfs filesystem | |
1da177e4 | 194 | * @name: a pointer to a string containing the name of the file to create. |
be030e65 | 195 | * @mode: the permission that the file should have. |
1da177e4 LT |
196 | * @parent: a pointer to the parent dentry for this file. This should be a |
197 | * directory dentry if set. If this paramater is NULL, then the | |
198 | * file will be created in the root of the debugfs filesystem. | |
199 | * @data: a pointer to something that the caller will want to get to later | |
8e18e294 | 200 | * on. The inode.i_private pointer will point to this value on |
1da177e4 LT |
201 | * the open() call. |
202 | * @fops: a pointer to a struct file_operations that should be used for | |
203 | * this file. | |
204 | * | |
205 | * This is the basic "create a file" function for debugfs. It allows for a | |
be030e65 AB |
206 | * wide range of flexibility in creating a file, or a directory (if you want |
207 | * to create a directory, the debugfs_create_dir() function is | |
1da177e4 LT |
208 | * recommended to be used instead.) |
209 | * | |
210 | * This function will return a pointer to a dentry if it succeeds. This | |
211 | * pointer must be passed to the debugfs_remove() function when the file is | |
212 | * to be removed (no automatic cleanup happens if your module is unloaded, | |
6468b3af | 213 | * you are responsible here.) If an error occurs, %NULL will be returned. |
1da177e4 | 214 | * |
6468b3af | 215 | * If debugfs is not enabled in the kernel, the value -%ENODEV will be |
873760fb | 216 | * returned. |
1da177e4 LT |
217 | */ |
218 | struct dentry *debugfs_create_file(const char *name, mode_t mode, | |
219 | struct dentry *parent, void *data, | |
99ac48f5 | 220 | const struct file_operations *fops) |
1da177e4 LT |
221 | { |
222 | struct dentry *dentry = NULL; | |
223 | int error; | |
224 | ||
225 | pr_debug("debugfs: creating file '%s'\n",name); | |
226 | ||
63223a06 MD |
227 | error = simple_pin_fs(&debug_fs_type, &debugfs_mount, |
228 | &debugfs_mount_count); | |
1da177e4 LT |
229 | if (error) |
230 | goto exit; | |
231 | ||
d3a3b0ad MD |
232 | error = debugfs_create_by_name(name, mode, parent, &dentry, |
233 | data, fops); | |
1da177e4 LT |
234 | if (error) { |
235 | dentry = NULL; | |
63223a06 | 236 | simple_release_fs(&debugfs_mount, &debugfs_mount_count); |
1da177e4 LT |
237 | goto exit; |
238 | } | |
1da177e4 LT |
239 | exit: |
240 | return dentry; | |
241 | } | |
242 | EXPORT_SYMBOL_GPL(debugfs_create_file); | |
243 | ||
244 | /** | |
245 | * debugfs_create_dir - create a directory in the debugfs filesystem | |
1da177e4 LT |
246 | * @name: a pointer to a string containing the name of the directory to |
247 | * create. | |
248 | * @parent: a pointer to the parent dentry for this file. This should be a | |
249 | * directory dentry if set. If this paramater is NULL, then the | |
250 | * directory will be created in the root of the debugfs filesystem. | |
251 | * | |
252 | * This function creates a directory in debugfs with the given name. | |
253 | * | |
254 | * This function will return a pointer to a dentry if it succeeds. This | |
255 | * pointer must be passed to the debugfs_remove() function when the file is | |
256 | * to be removed (no automatic cleanup happens if your module is unloaded, | |
6468b3af | 257 | * you are responsible here.) If an error occurs, %NULL will be returned. |
1da177e4 | 258 | * |
6468b3af | 259 | * If debugfs is not enabled in the kernel, the value -%ENODEV will be |
873760fb | 260 | * returned. |
1da177e4 LT |
261 | */ |
262 | struct dentry *debugfs_create_dir(const char *name, struct dentry *parent) | |
263 | { | |
264 | return debugfs_create_file(name, | |
265 | S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO, | |
266 | parent, NULL, NULL); | |
267 | } | |
268 | EXPORT_SYMBOL_GPL(debugfs_create_dir); | |
269 | ||
66f54963 PO |
270 | /** |
271 | * debugfs_create_symlink- create a symbolic link in the debugfs filesystem | |
272 | * @name: a pointer to a string containing the name of the symbolic link to | |
273 | * create. | |
274 | * @parent: a pointer to the parent dentry for this symbolic link. This | |
275 | * should be a directory dentry if set. If this paramater is NULL, | |
276 | * then the symbolic link will be created in the root of the debugfs | |
277 | * filesystem. | |
278 | * @target: a pointer to a string containing the path to the target of the | |
279 | * symbolic link. | |
280 | * | |
281 | * This function creates a symbolic link with the given name in debugfs that | |
282 | * links to the given target path. | |
283 | * | |
284 | * This function will return a pointer to a dentry if it succeeds. This | |
285 | * pointer must be passed to the debugfs_remove() function when the symbolic | |
286 | * link is to be removed (no automatic cleanup happens if your module is | |
287 | * unloaded, you are responsible here.) If an error occurs, %NULL will be | |
288 | * returned. | |
289 | * | |
290 | * If debugfs is not enabled in the kernel, the value -%ENODEV will be | |
873760fb | 291 | * returned. |
66f54963 PO |
292 | */ |
293 | struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent, | |
294 | const char *target) | |
295 | { | |
296 | struct dentry *result; | |
297 | char *link; | |
298 | ||
299 | link = kstrdup(target, GFP_KERNEL); | |
300 | if (!link) | |
301 | return NULL; | |
302 | ||
303 | result = debugfs_create_file(name, S_IFLNK | S_IRWXUGO, parent, link, | |
304 | NULL); | |
305 | if (!result) | |
306 | kfree(link); | |
307 | return result; | |
308 | } | |
309 | EXPORT_SYMBOL_GPL(debugfs_create_symlink); | |
310 | ||
9505e637 HS |
311 | static void __debugfs_remove(struct dentry *dentry, struct dentry *parent) |
312 | { | |
313 | int ret = 0; | |
314 | ||
315 | if (debugfs_positive(dentry)) { | |
316 | if (dentry->d_inode) { | |
317 | dget(dentry); | |
318 | switch (dentry->d_inode->i_mode & S_IFMT) { | |
319 | case S_IFDIR: | |
320 | ret = simple_rmdir(parent->d_inode, dentry); | |
321 | break; | |
322 | case S_IFLNK: | |
323 | kfree(dentry->d_inode->i_private); | |
324 | /* fall through */ | |
325 | default: | |
326 | simple_unlink(parent->d_inode, dentry); | |
327 | break; | |
328 | } | |
329 | if (!ret) | |
330 | d_delete(dentry); | |
331 | dput(dentry); | |
332 | } | |
333 | } | |
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; | |
352 | ||
353 | if (!dentry) | |
354 | return; | |
355 | ||
356 | parent = dentry->d_parent; | |
357 | if (!parent || !parent->d_inode) | |
358 | return; | |
359 | ||
1b1dcc1b | 360 | mutex_lock(&parent->d_inode->i_mutex); |
9505e637 HS |
361 | __debugfs_remove(dentry, parent); |
362 | mutex_unlock(&parent->d_inode->i_mutex); | |
363 | simple_release_fs(&debugfs_mount, &debugfs_mount_count); | |
364 | } | |
365 | EXPORT_SYMBOL_GPL(debugfs_remove); | |
366 | ||
367 | /** | |
368 | * debugfs_remove_recursive - recursively removes a directory | |
369 | * @dentry: a pointer to a the dentry of the directory to be removed. | |
370 | * | |
371 | * This function recursively removes a directory tree in debugfs that | |
372 | * was previously created with a call to another debugfs function | |
373 | * (like debugfs_create_file() or variants thereof.) | |
374 | * | |
375 | * This function is required to be called in order for the file to be | |
376 | * removed, no automatic cleanup of files will happen when a module is | |
377 | * removed, you are responsible here. | |
378 | */ | |
379 | void debugfs_remove_recursive(struct dentry *dentry) | |
380 | { | |
381 | struct dentry *child; | |
382 | struct dentry *parent; | |
383 | ||
384 | if (!dentry) | |
385 | return; | |
386 | ||
387 | parent = dentry->d_parent; | |
388 | if (!parent || !parent->d_inode) | |
389 | return; | |
390 | ||
391 | parent = dentry; | |
392 | mutex_lock(&parent->d_inode->i_mutex); | |
393 | ||
394 | while (1) { | |
395 | /* | |
396 | * When all dentries under "parent" has been removed, | |
397 | * walk up the tree until we reach our starting point. | |
398 | */ | |
399 | if (list_empty(&parent->d_subdirs)) { | |
400 | mutex_unlock(&parent->d_inode->i_mutex); | |
401 | if (parent == dentry) | |
66f54963 | 402 | break; |
9505e637 HS |
403 | parent = parent->d_parent; |
404 | mutex_lock(&parent->d_inode->i_mutex); | |
405 | } | |
406 | child = list_entry(parent->d_subdirs.next, struct dentry, | |
407 | d_u.d_child); | |
56a83cc9 | 408 | next_sibling: |
9505e637 HS |
409 | |
410 | /* | |
411 | * If "child" isn't empty, walk down the tree and | |
412 | * remove all its descendants first. | |
413 | */ | |
414 | if (!list_empty(&child->d_subdirs)) { | |
415 | mutex_unlock(&parent->d_inode->i_mutex); | |
416 | parent = child; | |
417 | mutex_lock(&parent->d_inode->i_mutex); | |
418 | continue; | |
1da177e4 | 419 | } |
9505e637 HS |
420 | __debugfs_remove(child, parent); |
421 | if (parent->d_subdirs.next == &child->d_u.d_child) { | |
56a83cc9 SR |
422 | /* |
423 | * Try the next sibling. | |
424 | */ | |
425 | if (child->d_u.d_child.next != &parent->d_subdirs) { | |
426 | child = list_entry(child->d_u.d_child.next, | |
427 | struct dentry, | |
428 | d_u.d_child); | |
429 | goto next_sibling; | |
430 | } | |
431 | ||
9505e637 HS |
432 | /* |
433 | * Avoid infinite loop if we fail to remove | |
434 | * one dentry. | |
435 | */ | |
436 | mutex_unlock(&parent->d_inode->i_mutex); | |
437 | break; | |
438 | } | |
439 | simple_release_fs(&debugfs_mount, &debugfs_mount_count); | |
1da177e4 | 440 | } |
9505e637 HS |
441 | |
442 | parent = dentry->d_parent; | |
443 | mutex_lock(&parent->d_inode->i_mutex); | |
444 | __debugfs_remove(dentry, parent); | |
1b1dcc1b | 445 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 LT |
446 | simple_release_fs(&debugfs_mount, &debugfs_mount_count); |
447 | } | |
9505e637 | 448 | EXPORT_SYMBOL_GPL(debugfs_remove_recursive); |
1da177e4 | 449 | |
cfc94cdf JK |
450 | /** |
451 | * debugfs_rename - rename a file/directory in the debugfs filesystem | |
452 | * @old_dir: a pointer to the parent dentry for the renamed object. This | |
453 | * should be a directory dentry. | |
454 | * @old_dentry: dentry of an object to be renamed. | |
455 | * @new_dir: a pointer to the parent dentry where the object should be | |
456 | * moved. This should be a directory dentry. | |
457 | * @new_name: a pointer to a string containing the target name. | |
458 | * | |
459 | * This function renames a file/directory in debugfs. The target must not | |
460 | * exist for rename to succeed. | |
461 | * | |
462 | * This function will return a pointer to old_dentry (which is updated to | |
463 | * reflect renaming) if it succeeds. If an error occurs, %NULL will be | |
464 | * returned. | |
465 | * | |
466 | * If debugfs is not enabled in the kernel, the value -%ENODEV will be | |
467 | * returned. | |
468 | */ | |
469 | struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry, | |
470 | struct dentry *new_dir, const char *new_name) | |
471 | { | |
472 | int error; | |
473 | struct dentry *dentry = NULL, *trap; | |
474 | const char *old_name; | |
475 | ||
476 | trap = lock_rename(new_dir, old_dir); | |
477 | /* Source or destination directories don't exist? */ | |
478 | if (!old_dir->d_inode || !new_dir->d_inode) | |
479 | goto exit; | |
480 | /* Source does not exist, cyclic rename, or mountpoint? */ | |
481 | if (!old_dentry->d_inode || old_dentry == trap || | |
482 | d_mountpoint(old_dentry)) | |
483 | goto exit; | |
484 | dentry = lookup_one_len(new_name, new_dir, strlen(new_name)); | |
485 | /* Lookup failed, cyclic rename or target exists? */ | |
486 | if (IS_ERR(dentry) || dentry == trap || dentry->d_inode) | |
487 | goto exit; | |
488 | ||
489 | old_name = fsnotify_oldname_init(old_dentry->d_name.name); | |
490 | ||
491 | error = simple_rename(old_dir->d_inode, old_dentry, new_dir->d_inode, | |
492 | dentry); | |
493 | if (error) { | |
494 | fsnotify_oldname_free(old_name); | |
495 | goto exit; | |
496 | } | |
497 | d_move(old_dentry, dentry); | |
498 | fsnotify_move(old_dir->d_inode, new_dir->d_inode, old_name, | |
123df294 | 499 | S_ISDIR(old_dentry->d_inode->i_mode), |
5a190ae6 | 500 | NULL, old_dentry); |
cfc94cdf JK |
501 | fsnotify_oldname_free(old_name); |
502 | unlock_rename(new_dir, old_dir); | |
503 | dput(dentry); | |
504 | return old_dentry; | |
505 | exit: | |
506 | if (dentry && !IS_ERR(dentry)) | |
507 | dput(dentry); | |
508 | unlock_rename(new_dir, old_dir); | |
509 | return NULL; | |
510 | } | |
511 | EXPORT_SYMBOL_GPL(debugfs_rename); | |
512 | ||
c0f92ba9 FW |
513 | /** |
514 | * debugfs_initialized - Tells whether debugfs has been registered | |
515 | */ | |
516 | bool debugfs_initialized(void) | |
517 | { | |
518 | return debugfs_registered; | |
519 | } | |
520 | EXPORT_SYMBOL_GPL(debugfs_initialized); | |
521 | ||
522 | ||
191e186b | 523 | static struct kobject *debug_kobj; |
1da177e4 LT |
524 | |
525 | static int __init debugfs_init(void) | |
526 | { | |
527 | int retval; | |
528 | ||
0ff21e46 | 529 | debug_kobj = kobject_create_and_add("debug", kernel_kobj); |
191e186b GKH |
530 | if (!debug_kobj) |
531 | return -EINVAL; | |
1da177e4 LT |
532 | |
533 | retval = register_filesystem(&debug_fs_type); | |
534 | if (retval) | |
197b12d6 | 535 | kobject_put(debug_kobj); |
c0f92ba9 FW |
536 | else |
537 | debugfs_registered = true; | |
538 | ||
1da177e4 LT |
539 | return retval; |
540 | } | |
541 | ||
542 | static void __exit debugfs_exit(void) | |
543 | { | |
c0f92ba9 FW |
544 | debugfs_registered = false; |
545 | ||
1da177e4 LT |
546 | simple_release_fs(&debugfs_mount, &debugfs_mount_count); |
547 | unregister_filesystem(&debug_fs_type); | |
197b12d6 | 548 | kobject_put(debug_kobj); |
1da177e4 LT |
549 | } |
550 | ||
551 | core_initcall(debugfs_init); | |
552 | module_exit(debugfs_exit); | |
553 | MODULE_LICENSE("GPL"); | |
554 |