Line data Source code
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 2 : __fsnotify_parent(dentry, mask);
35 :
36 2 : inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
37 2 : }
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 4 : struct inode *inode = dentry->d_inode;
277 4 : __u32 mask = 0;
278 :
279 4 : if (ia_valid & ATTR_UID)
280 2 : mask |= FS_ATTRIB;
281 4 : if (ia_valid & ATTR_GID)
282 2 : mask |= FS_ATTRIB;
283 4 : if (ia_valid & ATTR_SIZE)
284 2 : mask |= FS_MODIFY;
285 :
286 : /* both times implies a utime(s) call */
287 4 : if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
288 2 : mask |= FS_ATTRIB;
289 4 : else if (ia_valid & ATTR_ATIME)
290 2 : mask |= FS_ACCESS;
291 4 : else if (ia_valid & ATTR_MTIME)
292 2 : mask |= FS_MODIFY;
293 :
294 4 : if (ia_valid & ATTR_MODE)
295 2 : mask |= FS_ATTRIB;
296 :
297 4 : if (mask) {
298 6 : if (S_ISDIR(inode->i_mode))
299 2 : mask |= FS_IN_ISDIR;
300 2 : inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
301 :
302 4 : fsnotify_parent(dentry, mask);
303 2 : fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
304 : }
305 4 : }
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 1 :
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 */
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