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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> |
187f1882 | 17 | #include <linux/bug.h> |
0eeca283 | 18 | |
c28f7e56 | 19 | /* Notify this dentry's parent about a child's events. */ |
52420392 | 20 | static inline int fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask) |
c28f7e56 | 21 | { |
72acc854 | 22 | if (!dentry) |
2069601b | 23 | dentry = path->dentry; |
28c60e37 | 24 | |
52420392 | 25 | return __fsnotify_parent(path, dentry, mask); |
c28f7e56 EP |
26 | } |
27 | ||
c4ec54b4 EP |
28 | /* simple call site for access decisions */ |
29 | static inline int fsnotify_perm(struct file *file, int mask) | |
30 | { | |
2069601b | 31 | struct path *path = &file->f_path; |
f3fbbb07 AZ |
32 | /* |
33 | * Do not use file_inode() here or anywhere in this file to get the | |
34 | * inode. That would break *notity on overlayfs. | |
35 | */ | |
36 | struct inode *inode = path->dentry->d_inode; | |
fb1cfb88 | 37 | __u32 fsnotify_mask = 0; |
52420392 | 38 | int ret; |
c4ec54b4 EP |
39 | |
40 | if (file->f_mode & FMODE_NONOTIFY) | |
41 | return 0; | |
42 | if (!(mask & (MAY_READ | MAY_OPEN))) | |
43 | return 0; | |
c4ec54b4 EP |
44 | if (mask & MAY_OPEN) |
45 | fsnotify_mask = FS_OPEN_PERM; | |
fb1cfb88 EP |
46 | else if (mask & MAY_READ) |
47 | fsnotify_mask = FS_ACCESS_PERM; | |
48 | else | |
49 | BUG(); | |
c4ec54b4 | 50 | |
52420392 EP |
51 | ret = fsnotify_parent(path, NULL, fsnotify_mask); |
52 | if (ret) | |
53 | return ret; | |
54 | ||
2069601b | 55 | return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); |
c4ec54b4 EP |
56 | } |
57 | ||
90586523 EP |
58 | /* |
59 | * fsnotify_link_count - inode's link count changed | |
60 | */ | |
61 | static inline void fsnotify_link_count(struct inode *inode) | |
62 | { | |
47882c6f | 63 | fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
90586523 EP |
64 | } |
65 | ||
0eeca283 RL |
66 | /* |
67 | * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir | |
68 | */ | |
69 | static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir, | |
59b0df21 | 70 | const unsigned char *old_name, |
5a190ae6 | 71 | int isdir, struct inode *target, struct dentry *moved) |
0eeca283 | 72 | { |
5a190ae6 | 73 | struct inode *source = moved->d_inode; |
47882c6f | 74 | u32 fs_cookie = fsnotify_get_cookie(); |
ff52cc21 EP |
75 | __u32 old_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_FROM); |
76 | __u32 new_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_TO); | |
59b0df21 | 77 | const unsigned char *new_name = moved->d_name.name; |
0eeca283 | 78 | |
ff52cc21 EP |
79 | if (old_dir == new_dir) |
80 | old_dir_mask |= FS_DN_RENAME; | |
0eeca283 | 81 | |
90586523 | 82 | if (isdir) { |
b29866aa EP |
83 | old_dir_mask |= FS_ISDIR; |
84 | new_dir_mask |= FS_ISDIR; | |
90586523 EP |
85 | } |
86 | ||
6ee8e25f JK |
87 | fsnotify(old_dir, old_dir_mask, source, FSNOTIFY_EVENT_INODE, old_name, |
88 | fs_cookie); | |
89 | fsnotify(new_dir, new_dir_mask, source, FSNOTIFY_EVENT_INODE, new_name, | |
90 | fs_cookie); | |
90586523 | 91 | |
2dfc1cae | 92 | if (target) |
90586523 | 93 | fsnotify_link_count(target); |
89204c40 | 94 | |
2dfc1cae | 95 | if (source) |
47882c6f | 96 | fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
4fa6b5ec | 97 | audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE); |
0eeca283 RL |
98 | } |
99 | ||
3be25f49 EP |
100 | /* |
101 | * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed | |
102 | */ | |
103 | static inline void fsnotify_inode_delete(struct inode *inode) | |
104 | { | |
105 | __fsnotify_inode_delete(inode); | |
106 | } | |
107 | ||
ca9c726e AG |
108 | /* |
109 | * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed | |
110 | */ | |
111 | static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt) | |
112 | { | |
113 | __fsnotify_vfsmount_delete(mnt); | |
114 | } | |
115 | ||
7a91bf7f JM |
116 | /* |
117 | * fsnotify_nameremove - a filename was removed from a directory | |
118 | */ | |
119 | static inline void fsnotify_nameremove(struct dentry *dentry, int isdir) | |
120 | { | |
90586523 EP |
121 | __u32 mask = FS_DELETE; |
122 | ||
7a91bf7f | 123 | if (isdir) |
b29866aa | 124 | mask |= FS_ISDIR; |
c28f7e56 | 125 | |
28c60e37 | 126 | fsnotify_parent(NULL, dentry, mask); |
7a91bf7f JM |
127 | } |
128 | ||
129 | /* | |
130 | * fsnotify_inoderemove - an inode is going away | |
131 | */ | |
132 | static inline void fsnotify_inoderemove(struct inode *inode) | |
133 | { | |
47882c6f | 134 | fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
3be25f49 | 135 | __fsnotify_inode_delete(inode); |
ece95912 JK |
136 | } |
137 | ||
0eeca283 RL |
138 | /* |
139 | * fsnotify_create - 'name' was linked in | |
140 | */ | |
f38aa942 | 141 | static inline void fsnotify_create(struct inode *inode, struct dentry *dentry) |
0eeca283 | 142 | { |
4fa6b5ec | 143 | audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE); |
90586523 | 144 | |
47882c6f | 145 | fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); |
0eeca283 RL |
146 | } |
147 | ||
ece95912 JK |
148 | /* |
149 | * fsnotify_link - new hardlink in 'inode' directory | |
150 | * Note: We have to pass also the linked inode ptr as some filesystems leave | |
151 | * new_dentry->d_inode NULL and instantiate inode pointer later | |
152 | */ | |
153 | static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry) | |
154 | { | |
ece95912 | 155 | fsnotify_link_count(inode); |
4fa6b5ec | 156 | audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE); |
90586523 | 157 | |
47882c6f | 158 | fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0); |
ece95912 JK |
159 | } |
160 | ||
0eeca283 RL |
161 | /* |
162 | * fsnotify_mkdir - directory 'name' was created | |
163 | */ | |
f38aa942 | 164 | static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry) |
0eeca283 | 165 | { |
b29866aa | 166 | __u32 mask = (FS_CREATE | FS_ISDIR); |
90586523 EP |
167 | struct inode *d_inode = dentry->d_inode; |
168 | ||
4fa6b5ec | 169 | audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE); |
90586523 | 170 | |
47882c6f | 171 | fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); |
0eeca283 RL |
172 | } |
173 | ||
174 | /* | |
175 | * fsnotify_access - file was read | |
176 | */ | |
2a12a9d7 | 177 | static inline void fsnotify_access(struct file *file) |
0eeca283 | 178 | { |
2069601b | 179 | struct path *path = &file->f_path; |
f3fbbb07 | 180 | struct inode *inode = path->dentry->d_inode; |
90586523 | 181 | __u32 mask = FS_ACCESS; |
0eeca283 RL |
182 | |
183 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 184 | mask |= FS_ISDIR; |
0eeca283 | 185 | |
ecf081d1 | 186 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
187 | fsnotify_parent(path, NULL, mask); |
188 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 189 | } |
0eeca283 RL |
190 | } |
191 | ||
192 | /* | |
193 | * fsnotify_modify - file was modified | |
194 | */ | |
2a12a9d7 | 195 | static inline void fsnotify_modify(struct file *file) |
0eeca283 | 196 | { |
2069601b | 197 | struct path *path = &file->f_path; |
f3fbbb07 | 198 | struct inode *inode = path->dentry->d_inode; |
90586523 | 199 | __u32 mask = FS_MODIFY; |
0eeca283 RL |
200 | |
201 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 202 | mask |= FS_ISDIR; |
0eeca283 | 203 | |
ecf081d1 | 204 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
205 | fsnotify_parent(path, NULL, mask); |
206 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 207 | } |
0eeca283 RL |
208 | } |
209 | ||
210 | /* | |
211 | * fsnotify_open - file was opened | |
212 | */ | |
2a12a9d7 | 213 | static inline void fsnotify_open(struct file *file) |
0eeca283 | 214 | { |
2069601b | 215 | struct path *path = &file->f_path; |
f3fbbb07 | 216 | struct inode *inode = path->dentry->d_inode; |
90586523 | 217 | __u32 mask = FS_OPEN; |
0eeca283 RL |
218 | |
219 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 220 | mask |= FS_ISDIR; |
0eeca283 | 221 | |
6bff7ecc LS |
222 | fsnotify_parent(path, NULL, mask); |
223 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
0eeca283 RL |
224 | } |
225 | ||
226 | /* | |
227 | * fsnotify_close - file was closed | |
228 | */ | |
229 | static inline void fsnotify_close(struct file *file) | |
230 | { | |
2069601b | 231 | struct path *path = &file->f_path; |
f3fbbb07 | 232 | struct inode *inode = path->dentry->d_inode; |
aeb5d727 | 233 | fmode_t mode = file->f_mode; |
90586523 | 234 | __u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE; |
0eeca283 RL |
235 | |
236 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 237 | mask |= FS_ISDIR; |
0eeca283 | 238 | |
ecf081d1 | 239 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
240 | fsnotify_parent(path, NULL, mask); |
241 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 242 | } |
0eeca283 RL |
243 | } |
244 | ||
245 | /* | |
246 | * fsnotify_xattr - extended attributes were changed | |
247 | */ | |
248 | static inline void fsnotify_xattr(struct dentry *dentry) | |
249 | { | |
250 | struct inode *inode = dentry->d_inode; | |
90586523 | 251 | __u32 mask = FS_ATTRIB; |
0eeca283 RL |
252 | |
253 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 254 | mask |= FS_ISDIR; |
0eeca283 | 255 | |
28c60e37 | 256 | fsnotify_parent(NULL, dentry, mask); |
47882c6f | 257 | fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
0eeca283 RL |
258 | } |
259 | ||
260 | /* | |
261 | * fsnotify_change - notify_change event. file was modified and/or metadata | |
262 | * was changed. | |
263 | */ | |
264 | static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid) | |
265 | { | |
266 | struct inode *inode = dentry->d_inode; | |
3c5119c0 EP |
267 | __u32 mask = 0; |
268 | ||
269 | if (ia_valid & ATTR_UID) | |
270 | mask |= FS_ATTRIB; | |
271 | if (ia_valid & ATTR_GID) | |
272 | mask |= FS_ATTRIB; | |
273 | if (ia_valid & ATTR_SIZE) | |
274 | mask |= FS_MODIFY; | |
0eeca283 | 275 | |
0eeca283 RL |
276 | /* both times implies a utime(s) call */ |
277 | if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) | |
3c5119c0 EP |
278 | mask |= FS_ATTRIB; |
279 | else if (ia_valid & ATTR_ATIME) | |
280 | mask |= FS_ACCESS; | |
281 | else if (ia_valid & ATTR_MTIME) | |
282 | mask |= FS_MODIFY; | |
283 | ||
284 | if (ia_valid & ATTR_MODE) | |
285 | mask |= FS_ATTRIB; | |
0eeca283 | 286 | |
3c5119c0 | 287 | if (mask) { |
0eeca283 | 288 | if (S_ISDIR(inode->i_mode)) |
b29866aa | 289 | mask |= FS_ISDIR; |
28c60e37 EP |
290 | |
291 | fsnotify_parent(NULL, dentry, mask); | |
47882c6f | 292 | fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
0eeca283 RL |
293 | } |
294 | } | |
295 | ||
2dfc1cae | 296 | #if defined(CONFIG_FSNOTIFY) /* notify helpers */ |
0eeca283 RL |
297 | |
298 | /* | |
299 | * fsnotify_oldname_init - save off the old filename before we change it | |
300 | */ | |
59b0df21 | 301 | static inline const unsigned char *fsnotify_oldname_init(const unsigned char *name) |
0eeca283 RL |
302 | { |
303 | return kstrdup(name, GFP_KERNEL); | |
304 | } | |
305 | ||
306 | /* | |
307 | * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init | |
308 | */ | |
59b0df21 | 309 | static inline void fsnotify_oldname_free(const unsigned char *old_name) |
0eeca283 RL |
310 | { |
311 | kfree(old_name); | |
312 | } | |
313 | ||
28c60e37 | 314 | #else /* CONFIG_FSNOTIFY */ |
0eeca283 | 315 | |
59b0df21 | 316 | static inline const char *fsnotify_oldname_init(const unsigned char *name) |
0eeca283 RL |
317 | { |
318 | return NULL; | |
319 | } | |
320 | ||
59b0df21 | 321 | static inline void fsnotify_oldname_free(const unsigned char *old_name) |
0eeca283 RL |
322 | { |
323 | } | |
324 | ||
28c60e37 | 325 | #endif /* CONFIG_FSNOTIFY */ |
0eeca283 | 326 | |
0eeca283 | 327 | #endif /* _LINUX_FS_NOTIFY_H */ |