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/fsnotify_backend.h>
15 : #include <linux/audit.h>
16 : #include <linux/slab.h>
17 : #include <linux/bug.h>
18 :
19 : /*
20 : * fsnotify_d_instantiate - instantiate a dentry for inode
21 : */
22 : static inline void fsnotify_d_instantiate(struct dentry *dentry,
23 : struct inode *inode)
24 : {
25 : __fsnotify_d_instantiate(dentry, inode);
26 : }
27 :
28 : /* Notify this dentry's parent about a child's events. */
29 : static inline int fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
30 : {
31 : if (!dentry)
32 : dentry = path->dentry;
33 :
34 : return __fsnotify_parent(path, dentry, mask);
35 : }
36 :
37 : /* simple call site for access decisions */
38 : static inline int fsnotify_perm(struct file *file, int mask)
39 : {
40 : struct path *path = &file->f_path;
41 : struct inode *inode = file_inode(file);
42 : __u32 fsnotify_mask = 0;
43 : int ret;
44 :
45 : if (file->f_mode & FMODE_NONOTIFY)
46 : return 0;
47 : if (!(mask & (MAY_READ | MAY_OPEN)))
48 : return 0;
49 : if (mask & MAY_OPEN)
50 : fsnotify_mask = FS_OPEN_PERM;
51 : else if (mask & MAY_READ)
52 : fsnotify_mask = FS_ACCESS_PERM;
53 : else
54 : BUG();
55 :
56 : ret = fsnotify_parent(path, NULL, fsnotify_mask);
57 : if (ret)
58 : return ret;
59 :
60 : return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
61 : }
62 :
63 : /*
64 : * fsnotify_d_move - dentry has been moved
65 : */
66 : static inline void fsnotify_d_move(struct dentry *dentry)
67 : {
68 : /*
69 : * On move we need to update dentry->d_flags to indicate if the new parent
70 : * cares about events from this dentry.
71 : */
72 : __fsnotify_update_dcache_flags(dentry);
73 : }
74 :
75 : /*
76 : * fsnotify_link_count - inode's link count changed
77 : */
78 : static inline void fsnotify_link_count(struct inode *inode)
79 : {
80 : fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
81 : }
82 :
83 : /*
84 : * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
85 : */
86 : static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
87 : const unsigned char *old_name,
88 : int isdir, struct inode *target, struct dentry *moved)
89 : {
90 : struct inode *source = moved->d_inode;
91 : u32 fs_cookie = fsnotify_get_cookie();
92 : __u32 old_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_FROM);
93 : __u32 new_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_TO);
94 : const unsigned char *new_name = moved->d_name.name;
95 :
96 : if (old_dir == new_dir)
97 : old_dir_mask |= FS_DN_RENAME;
98 :
99 : if (isdir) {
100 : old_dir_mask |= FS_ISDIR;
101 : new_dir_mask |= FS_ISDIR;
102 : }
103 :
104 : fsnotify(old_dir, old_dir_mask, old_dir, FSNOTIFY_EVENT_INODE, old_name, fs_cookie);
105 : fsnotify(new_dir, new_dir_mask, new_dir, FSNOTIFY_EVENT_INODE, new_name, fs_cookie);
106 :
107 : if (target)
108 : fsnotify_link_count(target);
109 :
110 : if (source)
111 : fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0);
112 : audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE);
113 : }
114 :
115 : /*
116 : * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed
117 : */
118 : static inline void fsnotify_inode_delete(struct inode *inode)
119 : {
120 : __fsnotify_inode_delete(inode);
121 : }
122 :
123 : /*
124 : * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed
125 : */
126 : static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt)
127 : {
128 : __fsnotify_vfsmount_delete(mnt);
129 : }
130 :
131 : /*
132 : * fsnotify_nameremove - a filename was removed from a directory
133 : */
134 : static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
135 : {
136 : __u32 mask = FS_DELETE;
137 :
138 : if (isdir)
139 : mask |= FS_ISDIR;
140 :
141 : fsnotify_parent(NULL, dentry, mask);
142 : }
143 :
144 : /*
145 : * fsnotify_inoderemove - an inode is going away
146 : */
147 : static inline void fsnotify_inoderemove(struct inode *inode)
148 : {
149 : fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
150 : __fsnotify_inode_delete(inode);
151 : }
152 :
153 : /*
154 : * fsnotify_create - 'name' was linked in
155 : */
156 : static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
157 : {
158 : audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
159 :
160 : fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
161 : }
162 :
163 : /*
164 : * fsnotify_link - new hardlink in 'inode' directory
165 : * Note: We have to pass also the linked inode ptr as some filesystems leave
166 : * new_dentry->d_inode NULL and instantiate inode pointer later
167 : */
168 : static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
169 : {
170 : fsnotify_link_count(inode);
171 : audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE);
172 :
173 : fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0);
174 : }
175 :
176 : /*
177 : * fsnotify_mkdir - directory 'name' was created
178 : */
179 195 : static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
180 : {
181 : __u32 mask = (FS_CREATE | FS_ISDIR);
182 195 : struct inode *d_inode = dentry->d_inode;
183 :
184 195 : audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
185 :
186 195 : fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
187 195 : }
188 :
189 : /*
190 : * fsnotify_access - file was read
191 : */
192 : static inline void fsnotify_access(struct file *file)
193 : {
194 : struct path *path = &file->f_path;
195 : struct inode *inode = file_inode(file);
196 : __u32 mask = FS_ACCESS;
197 :
198 : if (S_ISDIR(inode->i_mode))
199 : mask |= FS_ISDIR;
200 :
201 : if (!(file->f_mode & FMODE_NONOTIFY)) {
202 : fsnotify_parent(path, NULL, mask);
203 : fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
204 : }
205 : }
206 :
207 : /*
208 : * fsnotify_modify - file was modified
209 : */
210 : static inline void fsnotify_modify(struct file *file)
211 : {
212 : struct path *path = &file->f_path;
213 : struct inode *inode = file_inode(file);
214 : __u32 mask = FS_MODIFY;
215 :
216 : if (S_ISDIR(inode->i_mode))
217 : mask |= FS_ISDIR;
218 :
219 : if (!(file->f_mode & FMODE_NONOTIFY)) {
220 : fsnotify_parent(path, NULL, mask);
221 : fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
222 : }
223 : }
224 :
225 : /*
226 : * fsnotify_open - file was opened
227 : */
228 : static inline void fsnotify_open(struct file *file)
229 : {
230 : struct path *path = &file->f_path;
231 : struct inode *inode = file_inode(file);
232 : __u32 mask = FS_OPEN;
233 :
234 : if (S_ISDIR(inode->i_mode))
235 : mask |= FS_ISDIR;
236 :
237 : fsnotify_parent(path, NULL, mask);
238 : fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
239 : }
240 :
241 : /*
242 : * fsnotify_close - file was closed
243 : */
244 : static inline void fsnotify_close(struct file *file)
245 : {
246 : struct path *path = &file->f_path;
247 : struct inode *inode = file_inode(file);
248 : fmode_t mode = file->f_mode;
249 : __u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;
250 :
251 : if (S_ISDIR(inode->i_mode))
252 : mask |= FS_ISDIR;
253 :
254 : if (!(file->f_mode & FMODE_NONOTIFY)) {
255 : fsnotify_parent(path, NULL, mask);
256 : fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
257 : }
258 : }
259 :
260 : /*
261 : * fsnotify_xattr - extended attributes were changed
262 : */
263 : static inline void fsnotify_xattr(struct dentry *dentry)
264 : {
265 : struct inode *inode = dentry->d_inode;
266 : __u32 mask = FS_ATTRIB;
267 :
268 : if (S_ISDIR(inode->i_mode))
269 : mask |= FS_ISDIR;
270 :
271 : fsnotify_parent(NULL, dentry, mask);
272 : fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
273 : }
274 :
275 : /*
276 : * fsnotify_change - notify_change event. file was modified and/or metadata
277 : * was changed.
278 : */
279 : static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
280 : {
281 : struct inode *inode = dentry->d_inode;
282 : __u32 mask = 0;
283 :
284 : if (ia_valid & ATTR_UID)
285 : mask |= FS_ATTRIB;
286 : if (ia_valid & ATTR_GID)
287 : mask |= FS_ATTRIB;
288 : if (ia_valid & ATTR_SIZE)
289 : mask |= FS_MODIFY;
290 :
291 : /* both times implies a utime(s) call */
292 : if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
293 : mask |= FS_ATTRIB;
294 : else if (ia_valid & ATTR_ATIME)
295 : mask |= FS_ACCESS;
296 : else if (ia_valid & ATTR_MTIME)
297 : mask |= FS_MODIFY;
298 :
299 : if (ia_valid & ATTR_MODE)
300 : mask |= FS_ATTRIB;
301 :
302 : if (mask) {
303 : if (S_ISDIR(inode->i_mode))
304 : mask |= FS_ISDIR;
305 :
306 : fsnotify_parent(NULL, dentry, mask);
307 : fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
308 : }
309 : }
310 :
311 : #if defined(CONFIG_FSNOTIFY) /* notify helpers */
312 :
313 : /*
314 : * fsnotify_oldname_init - save off the old filename before we change it
315 : */
316 : static inline const unsigned char *fsnotify_oldname_init(const unsigned char *name)
317 : {
318 : return kstrdup(name, GFP_KERNEL);
319 : }
320 :
321 : /*
322 : * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init
323 : */
324 : static inline void fsnotify_oldname_free(const unsigned char *old_name)
325 : {
326 : kfree(old_name);
327 : }
328 :
329 : #else /* CONFIG_FSNOTIFY */
330 :
331 : static inline const char *fsnotify_oldname_init(const unsigned char *name)
332 : {
333 : return NULL;
334 : }
335 :
336 : static inline void fsnotify_oldname_free(const unsigned char *old_name)
337 : {
338 : }
339 :
340 : #endif /* CONFIG_FSNOTIFY */
341 :
342 : #endif /* _LINUX_FS_NOTIFY_H */
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