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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; |
c77cecee | 32 | struct inode *inode = file_inode(file); |
fb1cfb88 | 33 | __u32 fsnotify_mask = 0; |
52420392 | 34 | int ret; |
c4ec54b4 EP |
35 | |
36 | if (file->f_mode & FMODE_NONOTIFY) | |
37 | return 0; | |
38 | if (!(mask & (MAY_READ | MAY_OPEN))) | |
39 | return 0; | |
c4ec54b4 EP |
40 | if (mask & MAY_OPEN) |
41 | fsnotify_mask = FS_OPEN_PERM; | |
fb1cfb88 EP |
42 | else if (mask & MAY_READ) |
43 | fsnotify_mask = FS_ACCESS_PERM; | |
44 | else | |
45 | BUG(); | |
c4ec54b4 | 46 | |
52420392 EP |
47 | ret = fsnotify_parent(path, NULL, fsnotify_mask); |
48 | if (ret) | |
49 | return ret; | |
50 | ||
2069601b | 51 | return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); |
c4ec54b4 EP |
52 | } |
53 | ||
c32ccd87 | 54 | /* |
e61ce867 | 55 | * fsnotify_d_move - dentry has been moved |
c32ccd87 | 56 | */ |
e61ce867 | 57 | static inline void fsnotify_d_move(struct dentry *dentry) |
c32ccd87 | 58 | { |
c28f7e56 | 59 | /* |
e61ce867 EP |
60 | * On move we need to update dentry->d_flags to indicate if the new parent |
61 | * cares about events from this dentry. | |
c28f7e56 | 62 | */ |
e61ce867 | 63 | __fsnotify_update_dcache_flags(dentry); |
c32ccd87 NP |
64 | } |
65 | ||
90586523 EP |
66 | /* |
67 | * fsnotify_link_count - inode's link count changed | |
68 | */ | |
69 | static inline void fsnotify_link_count(struct inode *inode) | |
70 | { | |
47882c6f | 71 | fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
90586523 EP |
72 | } |
73 | ||
0eeca283 RL |
74 | /* |
75 | * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir | |
76 | */ | |
77 | static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir, | |
59b0df21 | 78 | const unsigned char *old_name, |
5a190ae6 | 79 | int isdir, struct inode *target, struct dentry *moved) |
0eeca283 | 80 | { |
5a190ae6 | 81 | struct inode *source = moved->d_inode; |
47882c6f | 82 | u32 fs_cookie = fsnotify_get_cookie(); |
ff52cc21 EP |
83 | __u32 old_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_FROM); |
84 | __u32 new_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_TO); | |
59b0df21 | 85 | const unsigned char *new_name = moved->d_name.name; |
0eeca283 | 86 | |
ff52cc21 EP |
87 | if (old_dir == new_dir) |
88 | old_dir_mask |= FS_DN_RENAME; | |
0eeca283 | 89 | |
90586523 | 90 | if (isdir) { |
b29866aa EP |
91 | old_dir_mask |= FS_ISDIR; |
92 | new_dir_mask |= FS_ISDIR; | |
90586523 EP |
93 | } |
94 | ||
6ee8e25f JK |
95 | fsnotify(old_dir, old_dir_mask, source, FSNOTIFY_EVENT_INODE, old_name, |
96 | fs_cookie); | |
97 | fsnotify(new_dir, new_dir_mask, source, FSNOTIFY_EVENT_INODE, new_name, | |
98 | fs_cookie); | |
90586523 | 99 | |
2dfc1cae | 100 | if (target) |
90586523 | 101 | fsnotify_link_count(target); |
89204c40 | 102 | |
2dfc1cae | 103 | if (source) |
47882c6f | 104 | fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
4fa6b5ec | 105 | audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE); |
0eeca283 RL |
106 | } |
107 | ||
3be25f49 EP |
108 | /* |
109 | * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed | |
110 | */ | |
111 | static inline void fsnotify_inode_delete(struct inode *inode) | |
112 | { | |
113 | __fsnotify_inode_delete(inode); | |
114 | } | |
115 | ||
ca9c726e AG |
116 | /* |
117 | * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed | |
118 | */ | |
119 | static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt) | |
120 | { | |
121 | __fsnotify_vfsmount_delete(mnt); | |
122 | } | |
123 | ||
7a91bf7f JM |
124 | /* |
125 | * fsnotify_nameremove - a filename was removed from a directory | |
126 | */ | |
127 | static inline void fsnotify_nameremove(struct dentry *dentry, int isdir) | |
128 | { | |
90586523 EP |
129 | __u32 mask = FS_DELETE; |
130 | ||
7a91bf7f | 131 | if (isdir) |
b29866aa | 132 | mask |= FS_ISDIR; |
c28f7e56 | 133 | |
28c60e37 | 134 | fsnotify_parent(NULL, dentry, mask); |
7a91bf7f JM |
135 | } |
136 | ||
137 | /* | |
138 | * fsnotify_inoderemove - an inode is going away | |
139 | */ | |
140 | static inline void fsnotify_inoderemove(struct inode *inode) | |
141 | { | |
47882c6f | 142 | fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
3be25f49 | 143 | __fsnotify_inode_delete(inode); |
ece95912 JK |
144 | } |
145 | ||
0eeca283 RL |
146 | /* |
147 | * fsnotify_create - 'name' was linked in | |
148 | */ | |
f38aa942 | 149 | static inline void fsnotify_create(struct inode *inode, struct dentry *dentry) |
0eeca283 | 150 | { |
4fa6b5ec | 151 | audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE); |
90586523 | 152 | |
47882c6f | 153 | fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); |
0eeca283 RL |
154 | } |
155 | ||
ece95912 JK |
156 | /* |
157 | * fsnotify_link - new hardlink in 'inode' directory | |
158 | * Note: We have to pass also the linked inode ptr as some filesystems leave | |
159 | * new_dentry->d_inode NULL and instantiate inode pointer later | |
160 | */ | |
161 | static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry) | |
162 | { | |
ece95912 | 163 | fsnotify_link_count(inode); |
4fa6b5ec | 164 | audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE); |
90586523 | 165 | |
47882c6f | 166 | fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0); |
ece95912 JK |
167 | } |
168 | ||
0eeca283 RL |
169 | /* |
170 | * fsnotify_mkdir - directory 'name' was created | |
171 | */ | |
f38aa942 | 172 | static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry) |
0eeca283 | 173 | { |
b29866aa | 174 | __u32 mask = (FS_CREATE | FS_ISDIR); |
90586523 EP |
175 | struct inode *d_inode = dentry->d_inode; |
176 | ||
4fa6b5ec | 177 | audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE); |
90586523 | 178 | |
47882c6f | 179 | fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); |
0eeca283 RL |
180 | } |
181 | ||
182 | /* | |
183 | * fsnotify_access - file was read | |
184 | */ | |
2a12a9d7 | 185 | static inline void fsnotify_access(struct file *file) |
0eeca283 | 186 | { |
2069601b | 187 | struct path *path = &file->f_path; |
c77cecee | 188 | struct inode *inode = file_inode(file); |
90586523 | 189 | __u32 mask = FS_ACCESS; |
0eeca283 RL |
190 | |
191 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 192 | mask |= FS_ISDIR; |
0eeca283 | 193 | |
ecf081d1 | 194 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
195 | fsnotify_parent(path, NULL, mask); |
196 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 197 | } |
0eeca283 RL |
198 | } |
199 | ||
200 | /* | |
201 | * fsnotify_modify - file was modified | |
202 | */ | |
2a12a9d7 | 203 | static inline void fsnotify_modify(struct file *file) |
0eeca283 | 204 | { |
2069601b | 205 | struct path *path = &file->f_path; |
c77cecee | 206 | struct inode *inode = file_inode(file); |
90586523 | 207 | __u32 mask = FS_MODIFY; |
0eeca283 RL |
208 | |
209 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 210 | mask |= FS_ISDIR; |
0eeca283 | 211 | |
ecf081d1 | 212 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
213 | fsnotify_parent(path, NULL, mask); |
214 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 215 | } |
0eeca283 RL |
216 | } |
217 | ||
218 | /* | |
219 | * fsnotify_open - file was opened | |
220 | */ | |
2a12a9d7 | 221 | static inline void fsnotify_open(struct file *file) |
0eeca283 | 222 | { |
2069601b | 223 | struct path *path = &file->f_path; |
c77cecee | 224 | struct inode *inode = file_inode(file); |
90586523 | 225 | __u32 mask = FS_OPEN; |
0eeca283 RL |
226 | |
227 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 228 | mask |= FS_ISDIR; |
0eeca283 | 229 | |
6bff7ecc LS |
230 | fsnotify_parent(path, NULL, mask); |
231 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
0eeca283 RL |
232 | } |
233 | ||
234 | /* | |
235 | * fsnotify_close - file was closed | |
236 | */ | |
237 | static inline void fsnotify_close(struct file *file) | |
238 | { | |
2069601b | 239 | struct path *path = &file->f_path; |
496ad9aa | 240 | struct inode *inode = file_inode(file); |
aeb5d727 | 241 | fmode_t mode = file->f_mode; |
90586523 | 242 | __u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE; |
0eeca283 RL |
243 | |
244 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 245 | mask |= FS_ISDIR; |
0eeca283 | 246 | |
ecf081d1 | 247 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
248 | fsnotify_parent(path, NULL, mask); |
249 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 250 | } |
0eeca283 RL |
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; | |
90586523 | 259 | __u32 mask = FS_ATTRIB; |
0eeca283 RL |
260 | |
261 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 262 | mask |= FS_ISDIR; |
0eeca283 | 263 | |
28c60e37 | 264 | fsnotify_parent(NULL, dentry, mask); |
47882c6f | 265 | fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
0eeca283 RL |
266 | } |
267 | ||
268 | /* | |
269 | * fsnotify_change - notify_change event. file was modified and/or metadata | |
270 | * was changed. | |
271 | */ | |
272 | static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid) | |
273 | { | |
274 | struct inode *inode = dentry->d_inode; | |
3c5119c0 EP |
275 | __u32 mask = 0; |
276 | ||
277 | if (ia_valid & ATTR_UID) | |
278 | mask |= FS_ATTRIB; | |
279 | if (ia_valid & ATTR_GID) | |
280 | mask |= FS_ATTRIB; | |
281 | if (ia_valid & ATTR_SIZE) | |
282 | mask |= FS_MODIFY; | |
0eeca283 | 283 | |
0eeca283 RL |
284 | /* both times implies a utime(s) call */ |
285 | if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) | |
3c5119c0 EP |
286 | mask |= FS_ATTRIB; |
287 | else if (ia_valid & ATTR_ATIME) | |
288 | mask |= FS_ACCESS; | |
289 | else if (ia_valid & ATTR_MTIME) | |
290 | mask |= FS_MODIFY; | |
291 | ||
292 | if (ia_valid & ATTR_MODE) | |
293 | mask |= FS_ATTRIB; | |
0eeca283 | 294 | |
3c5119c0 | 295 | if (mask) { |
0eeca283 | 296 | if (S_ISDIR(inode->i_mode)) |
b29866aa | 297 | mask |= FS_ISDIR; |
28c60e37 EP |
298 | |
299 | fsnotify_parent(NULL, dentry, mask); | |
47882c6f | 300 | fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
0eeca283 RL |
301 | } |
302 | } | |
303 | ||
2dfc1cae | 304 | #if defined(CONFIG_FSNOTIFY) /* notify helpers */ |
0eeca283 RL |
305 | |
306 | /* | |
307 | * fsnotify_oldname_init - save off the old filename before we change it | |
308 | */ | |
59b0df21 | 309 | static inline const unsigned char *fsnotify_oldname_init(const unsigned char *name) |
0eeca283 RL |
310 | { |
311 | return kstrdup(name, GFP_KERNEL); | |
312 | } | |
313 | ||
314 | /* | |
315 | * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init | |
316 | */ | |
59b0df21 | 317 | static inline void fsnotify_oldname_free(const unsigned char *old_name) |
0eeca283 RL |
318 | { |
319 | kfree(old_name); | |
320 | } | |
321 | ||
28c60e37 | 322 | #else /* CONFIG_FSNOTIFY */ |
0eeca283 | 323 | |
59b0df21 | 324 | static inline const char *fsnotify_oldname_init(const unsigned char *name) |
0eeca283 RL |
325 | { |
326 | return NULL; | |
327 | } | |
328 | ||
59b0df21 | 329 | static inline void fsnotify_oldname_free(const unsigned char *old_name) |
0eeca283 RL |
330 | { |
331 | } | |
332 | ||
28c60e37 | 333 | #endif /* CONFIG_FSNOTIFY */ |
0eeca283 | 334 | |
0eeca283 | 335 | #endif /* _LINUX_FS_NOTIFY_H */ |