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/audit.h>
17
18 /*
19 * fsnotify_d_instantiate - instantiate a dentry for inode
20 * Called with dcache_lock held.
21 */
fsnotify_d_instantiate(struct dentry * entry,struct inode * inode)22 static inline void fsnotify_d_instantiate(struct dentry *entry,
23 struct inode *inode)
24 {
25 inotify_d_instantiate(entry, inode);
26 }
27
28 /*
29 * fsnotify_d_move - entry has been moved
30 * Called with dcache_lock and entry->d_lock held.
31 */
fsnotify_d_move(struct dentry * entry)32 static inline void fsnotify_d_move(struct dentry *entry)
33 {
34 inotify_d_move(entry);
35 }
36
37 /*
38 * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
39 */
fsnotify_move(struct inode * old_dir,struct inode * new_dir,const char * old_name,const char * new_name,int isdir,struct inode * target,struct dentry * moved)40 static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
41 const char *old_name, const char *new_name,
42 int isdir, struct inode *target, struct dentry *moved)
43 {
44 struct inode *source = moved->d_inode;
45 u32 cookie = inotify_get_cookie();
46
47 if (old_dir == new_dir)
48 inode_dir_notify(old_dir, DN_RENAME);
49 else {
50 inode_dir_notify(old_dir, DN_DELETE);
51 inode_dir_notify(new_dir, DN_CREATE);
52 }
53
54 if (isdir)
55 isdir = IN_ISDIR;
56 inotify_inode_queue_event(old_dir, IN_MOVED_FROM|isdir,cookie,old_name,
57 source);
58 inotify_inode_queue_event(new_dir, IN_MOVED_TO|isdir, cookie, new_name,
59 source);
60
61 if (target) {
62 inotify_inode_queue_event(target, IN_DELETE_SELF, 0, NULL, NULL);
63 inotify_inode_is_dead(target);
64 }
65
66 if (source) {
67 inotify_inode_queue_event(source, IN_MOVE_SELF, 0, NULL, NULL);
68 }
69 audit_inode_child(new_name, moved, new_dir);
70 }
71
72 /*
73 * fsnotify_nameremove - a filename was removed from a directory
74 */
fsnotify_nameremove(struct dentry * dentry,int isdir)75 static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
76 {
77 if (isdir)
78 isdir = IN_ISDIR;
79 dnotify_parent(dentry, DN_DELETE);
80 inotify_dentry_parent_queue_event(dentry, IN_DELETE|isdir, 0, dentry->d_name.name);
81 }
82
83 /*
84 * fsnotify_inoderemove - an inode is going away
85 */
fsnotify_inoderemove(struct inode * inode)86 static inline void fsnotify_inoderemove(struct inode *inode)
87 {
88 inotify_inode_queue_event(inode, IN_DELETE_SELF, 0, NULL, NULL);
89 inotify_inode_is_dead(inode);
90 }
91
92 /*
93 * fsnotify_link_count - inode's link count changed
94 */
fsnotify_link_count(struct inode * inode)95 static inline void fsnotify_link_count(struct inode *inode)
96 {
97 inotify_inode_queue_event(inode, IN_ATTRIB, 0, NULL, NULL);
98 }
99
100 /*
101 * fsnotify_create - 'name' was linked in
102 */
fsnotify_create(struct inode * inode,struct dentry * dentry)103 static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
104 {
105 inode_dir_notify(inode, DN_CREATE);
106 inotify_inode_queue_event(inode, IN_CREATE, 0, dentry->d_name.name,
107 dentry->d_inode);
108 audit_inode_child(dentry->d_name.name, dentry, inode);
109 }
110
111 /*
112 * fsnotify_link - new hardlink in 'inode' directory
113 * Note: We have to pass also the linked inode ptr as some filesystems leave
114 * new_dentry->d_inode NULL and instantiate inode pointer later
115 */
fsnotify_link(struct inode * dir,struct inode * inode,struct dentry * new_dentry)116 static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
117 {
118 inode_dir_notify(dir, DN_CREATE);
119 inotify_inode_queue_event(dir, IN_CREATE, 0, new_dentry->d_name.name,
120 inode);
121 fsnotify_link_count(inode);
122 audit_inode_child(new_dentry->d_name.name, new_dentry, dir);
123 }
124
125 /*
126 * fsnotify_mkdir - directory 'name' was created
127 */
fsnotify_mkdir(struct inode * inode,struct dentry * dentry)128 static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
129 {
130 inode_dir_notify(inode, DN_CREATE);
131 inotify_inode_queue_event(inode, IN_CREATE | IN_ISDIR, 0,
132 dentry->d_name.name, dentry->d_inode);
133 audit_inode_child(dentry->d_name.name, dentry, inode);
134 }
135
136 /*
137 * fsnotify_access - file was read
138 */
fsnotify_access(struct dentry * dentry)139 static inline void fsnotify_access(struct dentry *dentry)
140 {
141 struct inode *inode = dentry->d_inode;
142 u32 mask = IN_ACCESS;
143
144 if (S_ISDIR(inode->i_mode))
145 mask |= IN_ISDIR;
146
147 dnotify_parent(dentry, DN_ACCESS);
148 inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
149 inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
150 }
151
152 /*
153 * fsnotify_modify - file was modified
154 */
fsnotify_modify(struct dentry * dentry)155 static inline void fsnotify_modify(struct dentry *dentry)
156 {
157 struct inode *inode = dentry->d_inode;
158 u32 mask = IN_MODIFY;
159
160 if (S_ISDIR(inode->i_mode))
161 mask |= IN_ISDIR;
162
163 dnotify_parent(dentry, DN_MODIFY);
164 inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
165 inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
166 }
167
168 /*
169 * fsnotify_open - file was opened
170 */
fsnotify_open(struct dentry * dentry)171 static inline void fsnotify_open(struct dentry *dentry)
172 {
173 struct inode *inode = dentry->d_inode;
174 u32 mask = IN_OPEN;
175
176 if (S_ISDIR(inode->i_mode))
177 mask |= IN_ISDIR;
178
179 inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
180 inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
181 }
182
183 /*
184 * fsnotify_close - file was closed
185 */
fsnotify_close(struct file * file)186 static inline void fsnotify_close(struct file *file)
187 {
188 struct dentry *dentry = file->f_path.dentry;
189 struct inode *inode = dentry->d_inode;
190 const char *name = dentry->d_name.name;
191 fmode_t mode = file->f_mode;
192 u32 mask = (mode & FMODE_WRITE) ? IN_CLOSE_WRITE : IN_CLOSE_NOWRITE;
193
194 if (S_ISDIR(inode->i_mode))
195 mask |= IN_ISDIR;
196
197 inotify_dentry_parent_queue_event(dentry, mask, 0, name);
198 inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
199 }
200
201 /*
202 * fsnotify_xattr - extended attributes were changed
203 */
fsnotify_xattr(struct dentry * dentry)204 static inline void fsnotify_xattr(struct dentry *dentry)
205 {
206 struct inode *inode = dentry->d_inode;
207 u32 mask = IN_ATTRIB;
208
209 if (S_ISDIR(inode->i_mode))
210 mask |= IN_ISDIR;
211
212 inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
213 inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
214 }
215
216 /*
217 * fsnotify_change - notify_change event. file was modified and/or metadata
218 * was changed.
219 */
fsnotify_change(struct dentry * dentry,unsigned int ia_valid)220 static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
221 {
222 struct inode *inode = dentry->d_inode;
223 int dn_mask = 0;
224 u32 in_mask = 0;
225
226 if (ia_valid & ATTR_UID) {
227 in_mask |= IN_ATTRIB;
228 dn_mask |= DN_ATTRIB;
229 }
230 if (ia_valid & ATTR_GID) {
231 in_mask |= IN_ATTRIB;
232 dn_mask |= DN_ATTRIB;
233 }
234 if (ia_valid & ATTR_SIZE) {
235 in_mask |= IN_MODIFY;
236 dn_mask |= DN_MODIFY;
237 }
238 /* both times implies a utime(s) call */
239 if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
240 {
241 in_mask |= IN_ATTRIB;
242 dn_mask |= DN_ATTRIB;
243 } else if (ia_valid & ATTR_ATIME) {
244 in_mask |= IN_ACCESS;
245 dn_mask |= DN_ACCESS;
246 } else if (ia_valid & ATTR_MTIME) {
247 in_mask |= IN_MODIFY;
248 dn_mask |= DN_MODIFY;
249 }
250 if (ia_valid & ATTR_MODE) {
251 in_mask |= IN_ATTRIB;
252 dn_mask |= DN_ATTRIB;
253 }
254
255 if (dn_mask)
256 dnotify_parent(dentry, dn_mask);
257 if (in_mask) {
258 if (S_ISDIR(inode->i_mode))
259 in_mask |= IN_ISDIR;
260 inotify_inode_queue_event(inode, in_mask, 0, NULL, NULL);
261 inotify_dentry_parent_queue_event(dentry, in_mask, 0,
262 dentry->d_name.name);
263 }
264 }
265
266 #ifdef CONFIG_INOTIFY /* inotify helpers */
267
268 /*
269 * fsnotify_oldname_init - save off the old filename before we change it
270 */
fsnotify_oldname_init(const char * name)271 static inline const char *fsnotify_oldname_init(const char *name)
272 {
273 return kstrdup(name, GFP_KERNEL);
274 }
275
276 /*
277 * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init
278 */
fsnotify_oldname_free(const char * old_name)279 static inline void fsnotify_oldname_free(const char *old_name)
280 {
281 kfree(old_name);
282 }
283
284 #else /* CONFIG_INOTIFY */
285
fsnotify_oldname_init(const char * name)286 static inline const char *fsnotify_oldname_init(const char *name)
287 {
288 return NULL;
289 }
290
fsnotify_oldname_free(const char * old_name)291 static inline void fsnotify_oldname_free(const char *old_name)
292 {
293 }
294
295 #endif /* ! CONFIG_INOTIFY */
296
297 #endif /* _LINUX_FS_NOTIFY_H */
298