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0eeca283 RL |
1 | #ifndef _LINUX_FS_NOTIFY_H |
2 | #define _LINUX_FS_NOTIFY_H | |
3 | ||
4 | /* | |
5 | * include/linux/fsnotify.h - generic hooks for filesystem notification, to | |
6 | * reduce in-source duplication from both dnotify and inotify. | |
7 | * | |
8 | * We don't compile any of this away in some complicated menagerie of ifdefs. | |
9 | * Instead, we rely on the code inside to optimize away as needed. | |
10 | * | |
11 | * (C) Copyright 2005 Robert Love | |
12 | */ | |
13 | ||
90586523 | 14 | #include <linux/fsnotify_backend.h> |
73241ccc | 15 | #include <linux/audit.h> |
5a0e3ad6 | 16 | #include <linux/slab.h> |
0eeca283 | 17 | |
c32ccd87 NP |
18 | /* |
19 | * fsnotify_d_instantiate - instantiate a dentry for inode | |
20 | * Called with dcache_lock held. | |
21 | */ | |
e61ce867 EP |
22 | static inline void fsnotify_d_instantiate(struct dentry *dentry, |
23 | struct inode *inode) | |
c32ccd87 | 24 | { |
e61ce867 | 25 | __fsnotify_d_instantiate(dentry, inode); |
c32ccd87 NP |
26 | } |
27 | ||
c28f7e56 | 28 | /* Notify this dentry's parent about a child's events. */ |
52420392 | 29 | static inline int fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask) |
c28f7e56 | 30 | { |
72acc854 | 31 | if (!dentry) |
2069601b | 32 | dentry = path->dentry; |
28c60e37 | 33 | |
52420392 | 34 | return __fsnotify_parent(path, dentry, mask); |
c28f7e56 EP |
35 | } |
36 | ||
c4ec54b4 EP |
37 | /* simple call site for access decisions */ |
38 | static inline int fsnotify_perm(struct file *file, int mask) | |
39 | { | |
2069601b LT |
40 | struct path *path = &file->f_path; |
41 | struct inode *inode = path->dentry->d_inode; | |
fb1cfb88 | 42 | __u32 fsnotify_mask = 0; |
52420392 | 43 | int ret; |
c4ec54b4 EP |
44 | |
45 | if (file->f_mode & FMODE_NONOTIFY) | |
46 | return 0; | |
47 | if (!(mask & (MAY_READ | MAY_OPEN))) | |
48 | return 0; | |
c4ec54b4 EP |
49 | if (mask & MAY_OPEN) |
50 | fsnotify_mask = FS_OPEN_PERM; | |
fb1cfb88 EP |
51 | else if (mask & MAY_READ) |
52 | fsnotify_mask = FS_ACCESS_PERM; | |
53 | else | |
54 | BUG(); | |
c4ec54b4 | 55 | |
52420392 EP |
56 | ret = fsnotify_parent(path, NULL, fsnotify_mask); |
57 | if (ret) | |
58 | return ret; | |
59 | ||
2069601b | 60 | return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); |
c4ec54b4 EP |
61 | } |
62 | ||
c32ccd87 | 63 | /* |
e61ce867 EP |
64 | * fsnotify_d_move - dentry has been moved |
65 | * Called with dcache_lock and dentry->d_lock held. | |
c32ccd87 | 66 | */ |
e61ce867 | 67 | static inline void fsnotify_d_move(struct dentry *dentry) |
c32ccd87 | 68 | { |
c28f7e56 | 69 | /* |
e61ce867 EP |
70 | * On move we need to update dentry->d_flags to indicate if the new parent |
71 | * cares about events from this dentry. | |
c28f7e56 | 72 | */ |
e61ce867 | 73 | __fsnotify_update_dcache_flags(dentry); |
c32ccd87 NP |
74 | } |
75 | ||
90586523 EP |
76 | /* |
77 | * fsnotify_link_count - inode's link count changed | |
78 | */ | |
79 | static inline void fsnotify_link_count(struct inode *inode) | |
80 | { | |
47882c6f | 81 | fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
90586523 EP |
82 | } |
83 | ||
0eeca283 RL |
84 | /* |
85 | * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir | |
86 | */ | |
87 | static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir, | |
59b0df21 | 88 | const unsigned char *old_name, |
5a190ae6 | 89 | int isdir, struct inode *target, struct dentry *moved) |
0eeca283 | 90 | { |
5a190ae6 | 91 | struct inode *source = moved->d_inode; |
47882c6f | 92 | u32 fs_cookie = fsnotify_get_cookie(); |
ff52cc21 EP |
93 | __u32 old_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_FROM); |
94 | __u32 new_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_TO); | |
59b0df21 | 95 | const unsigned char *new_name = moved->d_name.name; |
0eeca283 | 96 | |
ff52cc21 EP |
97 | if (old_dir == new_dir) |
98 | old_dir_mask |= FS_DN_RENAME; | |
0eeca283 | 99 | |
90586523 | 100 | if (isdir) { |
b29866aa EP |
101 | old_dir_mask |= FS_ISDIR; |
102 | new_dir_mask |= FS_ISDIR; | |
90586523 EP |
103 | } |
104 | ||
47882c6f EP |
105 | fsnotify(old_dir, old_dir_mask, old_dir, FSNOTIFY_EVENT_INODE, old_name, fs_cookie); |
106 | fsnotify(new_dir, new_dir_mask, new_dir, FSNOTIFY_EVENT_INODE, new_name, fs_cookie); | |
90586523 | 107 | |
2dfc1cae | 108 | if (target) |
90586523 | 109 | fsnotify_link_count(target); |
89204c40 | 110 | |
2dfc1cae | 111 | if (source) |
47882c6f | 112 | fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
cccc6bba | 113 | audit_inode_child(moved, new_dir); |
0eeca283 RL |
114 | } |
115 | ||
3be25f49 EP |
116 | /* |
117 | * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed | |
118 | */ | |
119 | static inline void fsnotify_inode_delete(struct inode *inode) | |
120 | { | |
121 | __fsnotify_inode_delete(inode); | |
122 | } | |
123 | ||
ca9c726e AG |
124 | /* |
125 | * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed | |
126 | */ | |
127 | static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt) | |
128 | { | |
129 | __fsnotify_vfsmount_delete(mnt); | |
130 | } | |
131 | ||
7a91bf7f JM |
132 | /* |
133 | * fsnotify_nameremove - a filename was removed from a directory | |
134 | */ | |
135 | static inline void fsnotify_nameremove(struct dentry *dentry, int isdir) | |
136 | { | |
90586523 EP |
137 | __u32 mask = FS_DELETE; |
138 | ||
7a91bf7f | 139 | if (isdir) |
b29866aa | 140 | mask |= FS_ISDIR; |
c28f7e56 | 141 | |
28c60e37 | 142 | fsnotify_parent(NULL, dentry, mask); |
7a91bf7f JM |
143 | } |
144 | ||
145 | /* | |
146 | * fsnotify_inoderemove - an inode is going away | |
147 | */ | |
148 | static inline void fsnotify_inoderemove(struct inode *inode) | |
149 | { | |
47882c6f | 150 | fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
3be25f49 | 151 | __fsnotify_inode_delete(inode); |
ece95912 JK |
152 | } |
153 | ||
0eeca283 RL |
154 | /* |
155 | * fsnotify_create - 'name' was linked in | |
156 | */ | |
f38aa942 | 157 | static inline void fsnotify_create(struct inode *inode, struct dentry *dentry) |
0eeca283 | 158 | { |
cccc6bba | 159 | audit_inode_child(dentry, inode); |
90586523 | 160 | |
47882c6f | 161 | fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); |
0eeca283 RL |
162 | } |
163 | ||
ece95912 JK |
164 | /* |
165 | * fsnotify_link - new hardlink in 'inode' directory | |
166 | * Note: We have to pass also the linked inode ptr as some filesystems leave | |
167 | * new_dentry->d_inode NULL and instantiate inode pointer later | |
168 | */ | |
169 | static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry) | |
170 | { | |
ece95912 | 171 | fsnotify_link_count(inode); |
cccc6bba | 172 | audit_inode_child(new_dentry, dir); |
90586523 | 173 | |
47882c6f | 174 | fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0); |
ece95912 JK |
175 | } |
176 | ||
0eeca283 RL |
177 | /* |
178 | * fsnotify_mkdir - directory 'name' was created | |
179 | */ | |
f38aa942 | 180 | static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry) |
0eeca283 | 181 | { |
b29866aa | 182 | __u32 mask = (FS_CREATE | FS_ISDIR); |
90586523 EP |
183 | struct inode *d_inode = dentry->d_inode; |
184 | ||
cccc6bba | 185 | audit_inode_child(dentry, inode); |
90586523 | 186 | |
47882c6f | 187 | fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); |
0eeca283 RL |
188 | } |
189 | ||
190 | /* | |
191 | * fsnotify_access - file was read | |
192 | */ | |
2a12a9d7 | 193 | static inline void fsnotify_access(struct file *file) |
0eeca283 | 194 | { |
2069601b LT |
195 | struct path *path = &file->f_path; |
196 | struct inode *inode = path->dentry->d_inode; | |
90586523 | 197 | __u32 mask = FS_ACCESS; |
0eeca283 RL |
198 | |
199 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 200 | mask |= FS_ISDIR; |
0eeca283 | 201 | |
ecf081d1 | 202 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
203 | fsnotify_parent(path, NULL, mask); |
204 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 205 | } |
0eeca283 RL |
206 | } |
207 | ||
208 | /* | |
209 | * fsnotify_modify - file was modified | |
210 | */ | |
2a12a9d7 | 211 | static inline void fsnotify_modify(struct file *file) |
0eeca283 | 212 | { |
2069601b LT |
213 | struct path *path = &file->f_path; |
214 | struct inode *inode = path->dentry->d_inode; | |
90586523 | 215 | __u32 mask = FS_MODIFY; |
0eeca283 RL |
216 | |
217 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 218 | mask |= FS_ISDIR; |
0eeca283 | 219 | |
ecf081d1 | 220 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
221 | fsnotify_parent(path, NULL, mask); |
222 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 223 | } |
0eeca283 RL |
224 | } |
225 | ||
226 | /* | |
227 | * fsnotify_open - file was opened | |
228 | */ | |
2a12a9d7 | 229 | static inline void fsnotify_open(struct file *file) |
0eeca283 | 230 | { |
2069601b LT |
231 | struct path *path = &file->f_path; |
232 | struct inode *inode = path->dentry->d_inode; | |
90586523 | 233 | __u32 mask = FS_OPEN; |
0eeca283 RL |
234 | |
235 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 236 | mask |= FS_ISDIR; |
0eeca283 | 237 | |
ecf081d1 | 238 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
239 | fsnotify_parent(path, NULL, mask); |
240 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 241 | } |
0eeca283 RL |
242 | } |
243 | ||
244 | /* | |
245 | * fsnotify_close - file was closed | |
246 | */ | |
247 | static inline void fsnotify_close(struct file *file) | |
248 | { | |
2069601b | 249 | struct path *path = &file->f_path; |
28c60e37 | 250 | struct inode *inode = file->f_path.dentry->d_inode; |
aeb5d727 | 251 | fmode_t mode = file->f_mode; |
90586523 | 252 | __u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE; |
0eeca283 RL |
253 | |
254 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 255 | mask |= FS_ISDIR; |
0eeca283 | 256 | |
ecf081d1 | 257 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
258 | fsnotify_parent(path, NULL, mask); |
259 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 260 | } |
0eeca283 RL |
261 | } |
262 | ||
263 | /* | |
264 | * fsnotify_xattr - extended attributes were changed | |
265 | */ | |
266 | static inline void fsnotify_xattr(struct dentry *dentry) | |
267 | { | |
268 | struct inode *inode = dentry->d_inode; | |
90586523 | 269 | __u32 mask = FS_ATTRIB; |
0eeca283 RL |
270 | |
271 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 272 | mask |= FS_ISDIR; |
0eeca283 | 273 | |
28c60e37 | 274 | fsnotify_parent(NULL, dentry, mask); |
47882c6f | 275 | fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
0eeca283 RL |
276 | } |
277 | ||
278 | /* | |
279 | * fsnotify_change - notify_change event. file was modified and/or metadata | |
280 | * was changed. | |
281 | */ | |
282 | static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid) | |
283 | { | |
284 | struct inode *inode = dentry->d_inode; | |
3c5119c0 EP |
285 | __u32 mask = 0; |
286 | ||
287 | if (ia_valid & ATTR_UID) | |
288 | mask |= FS_ATTRIB; | |
289 | if (ia_valid & ATTR_GID) | |
290 | mask |= FS_ATTRIB; | |
291 | if (ia_valid & ATTR_SIZE) | |
292 | mask |= FS_MODIFY; | |
0eeca283 | 293 | |
0eeca283 RL |
294 | /* both times implies a utime(s) call */ |
295 | if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) | |
3c5119c0 EP |
296 | mask |= FS_ATTRIB; |
297 | else if (ia_valid & ATTR_ATIME) | |
298 | mask |= FS_ACCESS; | |
299 | else if (ia_valid & ATTR_MTIME) | |
300 | mask |= FS_MODIFY; | |
301 | ||
302 | if (ia_valid & ATTR_MODE) | |
303 | mask |= FS_ATTRIB; | |
0eeca283 | 304 | |
3c5119c0 | 305 | if (mask) { |
0eeca283 | 306 | if (S_ISDIR(inode->i_mode)) |
b29866aa | 307 | mask |= FS_ISDIR; |
28c60e37 EP |
308 | |
309 | fsnotify_parent(NULL, dentry, mask); | |
47882c6f | 310 | fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
0eeca283 RL |
311 | } |
312 | } | |
313 | ||
2dfc1cae | 314 | #if defined(CONFIG_FSNOTIFY) /* notify helpers */ |
0eeca283 RL |
315 | |
316 | /* | |
317 | * fsnotify_oldname_init - save off the old filename before we change it | |
318 | */ | |
59b0df21 | 319 | static inline const unsigned char *fsnotify_oldname_init(const unsigned char *name) |
0eeca283 RL |
320 | { |
321 | return kstrdup(name, GFP_KERNEL); | |
322 | } | |
323 | ||
324 | /* | |
325 | * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init | |
326 | */ | |
59b0df21 | 327 | static inline void fsnotify_oldname_free(const unsigned char *old_name) |
0eeca283 RL |
328 | { |
329 | kfree(old_name); | |
330 | } | |
331 | ||
28c60e37 | 332 | #else /* CONFIG_FSNOTIFY */ |
0eeca283 | 333 | |
59b0df21 | 334 | static inline const char *fsnotify_oldname_init(const unsigned char *name) |
0eeca283 RL |
335 | { |
336 | return NULL; | |
337 | } | |
338 | ||
59b0df21 | 339 | static inline void fsnotify_oldname_free(const unsigned char *old_name) |
0eeca283 RL |
340 | { |
341 | } | |
342 | ||
28c60e37 | 343 | #endif /* CONFIG_FSNOTIFY */ |
0eeca283 | 344 | |
0eeca283 | 345 | #endif /* _LINUX_FS_NOTIFY_H */ |