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Commit | Line | Data |
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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> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
1da177e4 | 31 | |
1da177e4 LT |
32 | static struct vfsmount *debugfs_mount; |
33 | static int debugfs_mount_count; | |
c0f92ba9 | 34 | static bool debugfs_registered; |
1da177e4 | 35 | |
d3a3b0ad MD |
36 | static struct inode *debugfs_get_inode(struct super_block *sb, int mode, dev_t dev, |
37 | void *data, const struct file_operations *fops) | |
38 | ||
1da177e4 LT |
39 | { |
40 | struct inode *inode = new_inode(sb); | |
41 | ||
42 | if (inode) { | |
43 | inode->i_mode = mode; | |
1da177e4 LT |
44 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
45 | switch (mode & S_IFMT) { | |
46 | default: | |
47 | init_special_inode(inode, mode, dev); | |
48 | break; | |
49 | case S_IFREG: | |
d3a3b0ad MD |
50 | inode->i_fop = fops ? fops : &debugfs_file_operations; |
51 | inode->i_private = data; | |
1da177e4 | 52 | break; |
66f54963 PO |
53 | case S_IFLNK: |
54 | inode->i_op = &debugfs_link_operations; | |
d3a3b0ad MD |
55 | inode->i_fop = fops; |
56 | inode->i_private = data; | |
66f54963 | 57 | break; |
1da177e4 LT |
58 | case S_IFDIR: |
59 | inode->i_op = &simple_dir_inode_operations; | |
d3a3b0ad MD |
60 | inode->i_fop = fops ? fops : &simple_dir_operations; |
61 | inode->i_private = data; | |
1da177e4 | 62 | |
bafb232e MD |
63 | /* directory inodes start off with i_nlink == 2 |
64 | * (for "." entry) */ | |
d8c76e6f | 65 | inc_nlink(inode); |
1da177e4 LT |
66 | break; |
67 | } | |
68 | } | |
69 | return inode; | |
70 | } | |
71 | ||
72 | /* SMP-safe */ | |
73 | static int debugfs_mknod(struct inode *dir, struct dentry *dentry, | |
d3a3b0ad MD |
74 | int mode, dev_t dev, void *data, |
75 | const struct file_operations *fops) | |
1da177e4 | 76 | { |
71601e2b | 77 | struct inode *inode; |
1da177e4 LT |
78 | int error = -EPERM; |
79 | ||
80 | if (dentry->d_inode) | |
81 | return -EEXIST; | |
82 | ||
d3a3b0ad | 83 | inode = debugfs_get_inode(dir->i_sb, mode, dev, data, fops); |
1da177e4 LT |
84 | if (inode) { |
85 | d_instantiate(dentry, inode); | |
86 | dget(dentry); | |
87 | error = 0; | |
88 | } | |
89 | return error; | |
90 | } | |
91 | ||
d3a3b0ad MD |
92 | static int debugfs_mkdir(struct inode *dir, struct dentry *dentry, int mode, |
93 | void *data, const struct file_operations *fops) | |
1da177e4 LT |
94 | { |
95 | int res; | |
96 | ||
97 | mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR; | |
d3a3b0ad | 98 | res = debugfs_mknod(dir, dentry, mode, 0, data, fops); |
4f36557f | 99 | if (!res) { |
d8c76e6f | 100 | inc_nlink(dir); |
4f36557f MD |
101 | fsnotify_mkdir(dir, dentry); |
102 | } | |
1da177e4 LT |
103 | return res; |
104 | } | |
105 | ||
d3a3b0ad MD |
106 | static int debugfs_link(struct inode *dir, struct dentry *dentry, int mode, |
107 | void *data, const struct file_operations *fops) | |
66f54963 PO |
108 | { |
109 | mode = (mode & S_IALLUGO) | S_IFLNK; | |
d3a3b0ad | 110 | return debugfs_mknod(dir, dentry, mode, 0, data, fops); |
66f54963 PO |
111 | } |
112 | ||
d3a3b0ad MD |
113 | static int debugfs_create(struct inode *dir, struct dentry *dentry, int mode, |
114 | void *data, const struct file_operations *fops) | |
1da177e4 | 115 | { |
4f36557f MD |
116 | int res; |
117 | ||
1da177e4 | 118 | mode = (mode & S_IALLUGO) | S_IFREG; |
d3a3b0ad | 119 | res = debugfs_mknod(dir, dentry, mode, 0, data, fops); |
4f36557f MD |
120 | if (!res) |
121 | fsnotify_create(dir, dentry); | |
122 | return res; | |
1da177e4 LT |
123 | } |
124 | ||
125 | static inline int debugfs_positive(struct dentry *dentry) | |
126 | { | |
127 | return dentry->d_inode && !d_unhashed(dentry); | |
128 | } | |
129 | ||
130 | static int debug_fill_super(struct super_block *sb, void *data, int silent) | |
131 | { | |
132 | static struct tree_descr debug_files[] = {{""}}; | |
133 | ||
134 | return simple_fill_super(sb, DEBUGFS_MAGIC, debug_files); | |
135 | } | |
136 | ||
454e2398 DH |
137 | static int debug_get_sb(struct file_system_type *fs_type, |
138 | int flags, const char *dev_name, | |
139 | void *data, struct vfsmount *mnt) | |
1da177e4 | 140 | { |
454e2398 | 141 | return get_sb_single(fs_type, flags, data, debug_fill_super, mnt); |
1da177e4 LT |
142 | } |
143 | ||
144 | static struct file_system_type debug_fs_type = { | |
145 | .owner = THIS_MODULE, | |
146 | .name = "debugfs", | |
147 | .get_sb = debug_get_sb, | |
148 | .kill_sb = kill_litter_super, | |
149 | }; | |
150 | ||
151 | static int debugfs_create_by_name(const char *name, mode_t mode, | |
152 | struct dentry *parent, | |
d3a3b0ad MD |
153 | struct dentry **dentry, |
154 | void *data, | |
155 | const struct file_operations *fops) | |
1da177e4 LT |
156 | { |
157 | int error = 0; | |
158 | ||
159 | /* If the parent is not specified, we create it in the root. | |
160 | * We need the root dentry to do this, which is in the super | |
161 | * block. A pointer to that is in the struct vfsmount that we | |
162 | * have around. | |
163 | */ | |
ef52c75e AV |
164 | if (!parent) |
165 | parent = debugfs_mount->mnt_sb->s_root; | |
1da177e4 LT |
166 | |
167 | *dentry = NULL; | |
1b1dcc1b | 168 | mutex_lock(&parent->d_inode->i_mutex); |
5f45f1a7 | 169 | *dentry = lookup_one_len(name, parent, strlen(name)); |
7bb0386f | 170 | if (!IS_ERR(*dentry)) { |
66f54963 PO |
171 | switch (mode & S_IFMT) { |
172 | case S_IFDIR: | |
d3a3b0ad MD |
173 | error = debugfs_mkdir(parent->d_inode, *dentry, mode, |
174 | data, fops); | |
66f54963 PO |
175 | break; |
176 | case S_IFLNK: | |
d3a3b0ad MD |
177 | error = debugfs_link(parent->d_inode, *dentry, mode, |
178 | data, fops); | |
66f54963 PO |
179 | break; |
180 | default: | |
d3a3b0ad MD |
181 | error = debugfs_create(parent->d_inode, *dentry, mode, |
182 | data, fops); | |
66f54963 PO |
183 | break; |
184 | } | |
65c33336 | 185 | dput(*dentry); |
1da177e4 | 186 | } else |
7bb0386f | 187 | error = PTR_ERR(*dentry); |
1b1dcc1b | 188 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 LT |
189 | |
190 | return error; | |
191 | } | |
192 | ||
193 | /** | |
194 | * debugfs_create_file - create a file in the debugfs filesystem | |
1da177e4 | 195 | * @name: a pointer to a string containing the name of the file to create. |
be030e65 | 196 | * @mode: the permission that the file should have. |
1da177e4 LT |
197 | * @parent: a pointer to the parent dentry for this file. This should be a |
198 | * directory dentry if set. If this paramater is NULL, then the | |
199 | * file will be created in the root of the debugfs filesystem. | |
200 | * @data: a pointer to something that the caller will want to get to later | |
8e18e294 | 201 | * on. The inode.i_private pointer will point to this value on |
1da177e4 LT |
202 | * the open() call. |
203 | * @fops: a pointer to a struct file_operations that should be used for | |
204 | * this file. | |
205 | * | |
206 | * This is the basic "create a file" function for debugfs. It allows for a | |
be030e65 AB |
207 | * wide range of flexibility in creating a file, or a directory (if you want |
208 | * to create a directory, the debugfs_create_dir() function is | |
1da177e4 LT |
209 | * recommended to be used instead.) |
210 | * | |
211 | * This function will return a pointer to a dentry if it succeeds. This | |
212 | * pointer must be passed to the debugfs_remove() function when the file is | |
213 | * to be removed (no automatic cleanup happens if your module is unloaded, | |
6468b3af | 214 | * you are responsible here.) If an error occurs, %NULL will be returned. |
1da177e4 | 215 | * |
6468b3af | 216 | * If debugfs is not enabled in the kernel, the value -%ENODEV will be |
873760fb | 217 | * returned. |
1da177e4 LT |
218 | */ |
219 | struct dentry *debugfs_create_file(const char *name, mode_t mode, | |
220 | struct dentry *parent, void *data, | |
99ac48f5 | 221 | const struct file_operations *fops) |
1da177e4 LT |
222 | { |
223 | struct dentry *dentry = NULL; | |
224 | int error; | |
225 | ||
226 | pr_debug("debugfs: creating file '%s'\n",name); | |
227 | ||
63223a06 MD |
228 | error = simple_pin_fs(&debug_fs_type, &debugfs_mount, |
229 | &debugfs_mount_count); | |
1da177e4 LT |
230 | if (error) |
231 | goto exit; | |
232 | ||
d3a3b0ad MD |
233 | error = debugfs_create_by_name(name, mode, parent, &dentry, |
234 | data, fops); | |
1da177e4 LT |
235 | if (error) { |
236 | dentry = NULL; | |
63223a06 | 237 | simple_release_fs(&debugfs_mount, &debugfs_mount_count); |
1da177e4 LT |
238 | goto exit; |
239 | } | |
1da177e4 LT |
240 | exit: |
241 | return dentry; | |
242 | } | |
243 | EXPORT_SYMBOL_GPL(debugfs_create_file); | |
244 | ||
245 | /** | |
246 | * debugfs_create_dir - create a directory in the debugfs filesystem | |
1da177e4 LT |
247 | * @name: a pointer to a string containing the name of the directory to |
248 | * create. | |
249 | * @parent: a pointer to the parent dentry for this file. This should be a | |
250 | * directory dentry if set. If this paramater is NULL, then the | |
251 | * directory will be created in the root of the debugfs filesystem. | |
252 | * | |
253 | * This function creates a directory in debugfs with the given name. | |
254 | * | |
255 | * This function will return a pointer to a dentry if it succeeds. This | |
256 | * pointer must be passed to the debugfs_remove() function when the file is | |
257 | * to be removed (no automatic cleanup happens if your module is unloaded, | |
6468b3af | 258 | * you are responsible here.) If an error occurs, %NULL will be returned. |
1da177e4 | 259 | * |
6468b3af | 260 | * If debugfs is not enabled in the kernel, the value -%ENODEV will be |
873760fb | 261 | * returned. |
1da177e4 LT |
262 | */ |
263 | struct dentry *debugfs_create_dir(const char *name, struct dentry *parent) | |
264 | { | |
265 | return debugfs_create_file(name, | |
266 | S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO, | |
267 | parent, NULL, NULL); | |
268 | } | |
269 | EXPORT_SYMBOL_GPL(debugfs_create_dir); | |
270 | ||
66f54963 PO |
271 | /** |
272 | * debugfs_create_symlink- create a symbolic link in the debugfs filesystem | |
273 | * @name: a pointer to a string containing the name of the symbolic link to | |
274 | * create. | |
275 | * @parent: a pointer to the parent dentry for this symbolic link. This | |
276 | * should be a directory dentry if set. If this paramater is NULL, | |
277 | * then the symbolic link will be created in the root of the debugfs | |
278 | * filesystem. | |
279 | * @target: a pointer to a string containing the path to the target of the | |
280 | * symbolic link. | |
281 | * | |
282 | * This function creates a symbolic link with the given name in debugfs that | |
283 | * links to the given target path. | |
284 | * | |
285 | * This function will return a pointer to a dentry if it succeeds. This | |
286 | * pointer must be passed to the debugfs_remove() function when the symbolic | |
287 | * link is to be removed (no automatic cleanup happens if your module is | |
288 | * unloaded, you are responsible here.) If an error occurs, %NULL will be | |
289 | * returned. | |
290 | * | |
291 | * If debugfs is not enabled in the kernel, the value -%ENODEV will be | |
873760fb | 292 | * returned. |
66f54963 PO |
293 | */ |
294 | struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent, | |
295 | const char *target) | |
296 | { | |
297 | struct dentry *result; | |
298 | char *link; | |
299 | ||
300 | link = kstrdup(target, GFP_KERNEL); | |
301 | if (!link) | |
302 | return NULL; | |
303 | ||
304 | result = debugfs_create_file(name, S_IFLNK | S_IRWXUGO, parent, link, | |
305 | NULL); | |
306 | if (!result) | |
307 | kfree(link); | |
308 | return result; | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(debugfs_create_symlink); | |
311 | ||
9505e637 HS |
312 | static void __debugfs_remove(struct dentry *dentry, struct dentry *parent) |
313 | { | |
314 | int ret = 0; | |
315 | ||
316 | if (debugfs_positive(dentry)) { | |
317 | if (dentry->d_inode) { | |
318 | dget(dentry); | |
319 | switch (dentry->d_inode->i_mode & S_IFMT) { | |
320 | case S_IFDIR: | |
321 | ret = simple_rmdir(parent->d_inode, dentry); | |
322 | break; | |
323 | case S_IFLNK: | |
324 | kfree(dentry->d_inode->i_private); | |
325 | /* fall through */ | |
326 | default: | |
327 | simple_unlink(parent->d_inode, dentry); | |
328 | break; | |
329 | } | |
330 | if (!ret) | |
331 | d_delete(dentry); | |
332 | dput(dentry); | |
333 | } | |
334 | } | |
335 | } | |
336 | ||
1da177e4 LT |
337 | /** |
338 | * debugfs_remove - removes a file or directory from the debugfs filesystem | |
1da177e4 LT |
339 | * @dentry: a pointer to a the dentry of the file or directory to be |
340 | * removed. | |
341 | * | |
342 | * This function removes a file or directory in debugfs that was previously | |
343 | * created with a call to another debugfs function (like | |
5a65980e | 344 | * debugfs_create_file() or variants thereof.) |
1da177e4 LT |
345 | * |
346 | * This function is required to be called in order for the file to be | |
347 | * removed, no automatic cleanup of files will happen when a module is | |
348 | * removed, you are responsible here. | |
349 | */ | |
350 | void debugfs_remove(struct dentry *dentry) | |
351 | { | |
352 | struct dentry *parent; | |
353 | ||
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); |
9505e637 HS |
362 | __debugfs_remove(dentry, parent); |
363 | mutex_unlock(&parent->d_inode->i_mutex); | |
364 | simple_release_fs(&debugfs_mount, &debugfs_mount_count); | |
365 | } | |
366 | EXPORT_SYMBOL_GPL(debugfs_remove); | |
367 | ||
368 | /** | |
369 | * debugfs_remove_recursive - recursively removes a directory | |
370 | * @dentry: a pointer to a the dentry of the directory to be removed. | |
371 | * | |
372 | * This function recursively removes a directory tree in debugfs that | |
373 | * was previously created with a call to another debugfs function | |
374 | * (like debugfs_create_file() or variants thereof.) | |
375 | * | |
376 | * This function is required to be called in order for the file to be | |
377 | * removed, no automatic cleanup of files will happen when a module is | |
378 | * removed, you are responsible here. | |
379 | */ | |
380 | void debugfs_remove_recursive(struct dentry *dentry) | |
381 | { | |
382 | struct dentry *child; | |
383 | struct dentry *parent; | |
384 | ||
385 | if (!dentry) | |
386 | return; | |
387 | ||
388 | parent = dentry->d_parent; | |
389 | if (!parent || !parent->d_inode) | |
390 | return; | |
391 | ||
392 | parent = dentry; | |
393 | mutex_lock(&parent->d_inode->i_mutex); | |
394 | ||
395 | while (1) { | |
396 | /* | |
397 | * When all dentries under "parent" has been removed, | |
398 | * walk up the tree until we reach our starting point. | |
399 | */ | |
400 | if (list_empty(&parent->d_subdirs)) { | |
401 | mutex_unlock(&parent->d_inode->i_mutex); | |
402 | if (parent == dentry) | |
66f54963 | 403 | break; |
9505e637 HS |
404 | parent = parent->d_parent; |
405 | mutex_lock(&parent->d_inode->i_mutex); | |
406 | } | |
407 | child = list_entry(parent->d_subdirs.next, struct dentry, | |
408 | d_u.d_child); | |
56a83cc9 | 409 | next_sibling: |
9505e637 HS |
410 | |
411 | /* | |
412 | * If "child" isn't empty, walk down the tree and | |
413 | * remove all its descendants first. | |
414 | */ | |
415 | if (!list_empty(&child->d_subdirs)) { | |
416 | mutex_unlock(&parent->d_inode->i_mutex); | |
417 | parent = child; | |
418 | mutex_lock(&parent->d_inode->i_mutex); | |
419 | continue; | |
1da177e4 | 420 | } |
9505e637 HS |
421 | __debugfs_remove(child, parent); |
422 | if (parent->d_subdirs.next == &child->d_u.d_child) { | |
56a83cc9 SR |
423 | /* |
424 | * Try the next sibling. | |
425 | */ | |
426 | if (child->d_u.d_child.next != &parent->d_subdirs) { | |
427 | child = list_entry(child->d_u.d_child.next, | |
428 | struct dentry, | |
429 | d_u.d_child); | |
430 | goto next_sibling; | |
431 | } | |
432 | ||
9505e637 HS |
433 | /* |
434 | * Avoid infinite loop if we fail to remove | |
435 | * one dentry. | |
436 | */ | |
437 | mutex_unlock(&parent->d_inode->i_mutex); | |
438 | break; | |
439 | } | |
440 | simple_release_fs(&debugfs_mount, &debugfs_mount_count); | |
1da177e4 | 441 | } |
9505e637 HS |
442 | |
443 | parent = dentry->d_parent; | |
444 | mutex_lock(&parent->d_inode->i_mutex); | |
445 | __debugfs_remove(dentry, parent); | |
1b1dcc1b | 446 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 LT |
447 | simple_release_fs(&debugfs_mount, &debugfs_mount_count); |
448 | } | |
9505e637 | 449 | EXPORT_SYMBOL_GPL(debugfs_remove_recursive); |
1da177e4 | 450 | |
cfc94cdf JK |
451 | /** |
452 | * debugfs_rename - rename a file/directory in the debugfs filesystem | |
453 | * @old_dir: a pointer to the parent dentry for the renamed object. This | |
454 | * should be a directory dentry. | |
455 | * @old_dentry: dentry of an object to be renamed. | |
456 | * @new_dir: a pointer to the parent dentry where the object should be | |
457 | * moved. This should be a directory dentry. | |
458 | * @new_name: a pointer to a string containing the target name. | |
459 | * | |
460 | * This function renames a file/directory in debugfs. The target must not | |
461 | * exist for rename to succeed. | |
462 | * | |
463 | * This function will return a pointer to old_dentry (which is updated to | |
464 | * reflect renaming) if it succeeds. If an error occurs, %NULL will be | |
465 | * returned. | |
466 | * | |
467 | * If debugfs is not enabled in the kernel, the value -%ENODEV will be | |
468 | * returned. | |
469 | */ | |
470 | struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry, | |
471 | struct dentry *new_dir, const char *new_name) | |
472 | { | |
473 | int error; | |
474 | struct dentry *dentry = NULL, *trap; | |
475 | const char *old_name; | |
476 | ||
477 | trap = lock_rename(new_dir, old_dir); | |
478 | /* Source or destination directories don't exist? */ | |
479 | if (!old_dir->d_inode || !new_dir->d_inode) | |
480 | goto exit; | |
481 | /* Source does not exist, cyclic rename, or mountpoint? */ | |
482 | if (!old_dentry->d_inode || old_dentry == trap || | |
483 | d_mountpoint(old_dentry)) | |
484 | goto exit; | |
485 | dentry = lookup_one_len(new_name, new_dir, strlen(new_name)); | |
486 | /* Lookup failed, cyclic rename or target exists? */ | |
487 | if (IS_ERR(dentry) || dentry == trap || dentry->d_inode) | |
488 | goto exit; | |
489 | ||
490 | old_name = fsnotify_oldname_init(old_dentry->d_name.name); | |
491 | ||
492 | error = simple_rename(old_dir->d_inode, old_dentry, new_dir->d_inode, | |
493 | dentry); | |
494 | if (error) { | |
495 | fsnotify_oldname_free(old_name); | |
496 | goto exit; | |
497 | } | |
498 | d_move(old_dentry, dentry); | |
499 | fsnotify_move(old_dir->d_inode, new_dir->d_inode, old_name, | |
123df294 | 500 | S_ISDIR(old_dentry->d_inode->i_mode), |
5a190ae6 | 501 | NULL, old_dentry); |
cfc94cdf JK |
502 | fsnotify_oldname_free(old_name); |
503 | unlock_rename(new_dir, old_dir); | |
504 | dput(dentry); | |
505 | return old_dentry; | |
506 | exit: | |
507 | if (dentry && !IS_ERR(dentry)) | |
508 | dput(dentry); | |
509 | unlock_rename(new_dir, old_dir); | |
510 | return NULL; | |
511 | } | |
512 | EXPORT_SYMBOL_GPL(debugfs_rename); | |
513 | ||
c0f92ba9 FW |
514 | /** |
515 | * debugfs_initialized - Tells whether debugfs has been registered | |
516 | */ | |
517 | bool debugfs_initialized(void) | |
518 | { | |
519 | return debugfs_registered; | |
520 | } | |
521 | EXPORT_SYMBOL_GPL(debugfs_initialized); | |
522 | ||
523 | ||
191e186b | 524 | static struct kobject *debug_kobj; |
1da177e4 LT |
525 | |
526 | static int __init debugfs_init(void) | |
527 | { | |
528 | int retval; | |
529 | ||
0ff21e46 | 530 | debug_kobj = kobject_create_and_add("debug", kernel_kobj); |
191e186b GKH |
531 | if (!debug_kobj) |
532 | return -EINVAL; | |
1da177e4 LT |
533 | |
534 | retval = register_filesystem(&debug_fs_type); | |
535 | if (retval) | |
197b12d6 | 536 | kobject_put(debug_kobj); |
c0f92ba9 FW |
537 | else |
538 | debugfs_registered = true; | |
539 | ||
1da177e4 LT |
540 | return retval; |
541 | } | |
542 | ||
543 | static void __exit debugfs_exit(void) | |
544 | { | |
c0f92ba9 FW |
545 | debugfs_registered = false; |
546 | ||
1da177e4 LT |
547 | simple_release_fs(&debugfs_mount, &debugfs_mount_count); |
548 | unregister_filesystem(&debug_fs_type); | |
197b12d6 | 549 | kobject_put(debug_kobj); |
1da177e4 LT |
550 | } |
551 | ||
552 | core_initcall(debugfs_init); | |
553 | module_exit(debugfs_exit); | |
554 | MODULE_LICENSE("GPL"); | |
555 |