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