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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 | |
c32ccd87 NP |
19 | /* |
20 | * fsnotify_d_instantiate - instantiate a dentry for inode | |
c32ccd87 | 21 | */ |
e61ce867 EP |
22 | static inline void fsnotify_d_instantiate(struct dentry *dentry, |
23 | struct inode *inode) | |
c32ccd87 | 24 | { |
e61ce867 | 25 | __fsnotify_d_instantiate(dentry, inode); |
c32ccd87 NP |
26 | } |
27 | ||
c28f7e56 | 28 | /* Notify this dentry's parent about a child's events. */ |
52420392 | 29 | static inline int fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask) |
c28f7e56 | 30 | { |
72acc854 | 31 | if (!dentry) |
2069601b | 32 | dentry = path->dentry; |
28c60e37 | 33 | |
52420392 | 34 | return __fsnotify_parent(path, dentry, mask); |
c28f7e56 EP |
35 | } |
36 | ||
c4ec54b4 EP |
37 | /* simple call site for access decisions */ |
38 | static inline int fsnotify_perm(struct file *file, int mask) | |
39 | { | |
2069601b | 40 | struct path *path = &file->f_path; |
c77cecee | 41 | struct inode *inode = file_inode(file); |
fb1cfb88 | 42 | __u32 fsnotify_mask = 0; |
52420392 | 43 | int ret; |
c4ec54b4 EP |
44 | |
45 | if (file->f_mode & FMODE_NONOTIFY) | |
46 | return 0; | |
47 | if (!(mask & (MAY_READ | MAY_OPEN))) | |
48 | return 0; | |
c4ec54b4 EP |
49 | if (mask & MAY_OPEN) |
50 | fsnotify_mask = FS_OPEN_PERM; | |
fb1cfb88 EP |
51 | else if (mask & MAY_READ) |
52 | fsnotify_mask = FS_ACCESS_PERM; | |
53 | else | |
54 | BUG(); | |
c4ec54b4 | 55 | |
52420392 EP |
56 | ret = fsnotify_parent(path, NULL, fsnotify_mask); |
57 | if (ret) | |
58 | return ret; | |
59 | ||
2069601b | 60 | return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); |
c4ec54b4 EP |
61 | } |
62 | ||
c32ccd87 | 63 | /* |
e61ce867 | 64 | * fsnotify_d_move - dentry has been moved |
c32ccd87 | 65 | */ |
e61ce867 | 66 | static inline void fsnotify_d_move(struct dentry *dentry) |
c32ccd87 | 67 | { |
c28f7e56 | 68 | /* |
e61ce867 EP |
69 | * On move we need to update dentry->d_flags to indicate if the new parent |
70 | * cares about events from this dentry. | |
c28f7e56 | 71 | */ |
e61ce867 | 72 | __fsnotify_update_dcache_flags(dentry); |
c32ccd87 NP |
73 | } |
74 | ||
90586523 EP |
75 | /* |
76 | * fsnotify_link_count - inode's link count changed | |
77 | */ | |
78 | static inline void fsnotify_link_count(struct inode *inode) | |
79 | { | |
47882c6f | 80 | fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
90586523 EP |
81 | } |
82 | ||
0eeca283 RL |
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, | |
59b0df21 | 87 | const unsigned char *old_name, |
5a190ae6 | 88 | int isdir, struct inode *target, struct dentry *moved) |
0eeca283 | 89 | { |
5a190ae6 | 90 | struct inode *source = moved->d_inode; |
47882c6f | 91 | u32 fs_cookie = fsnotify_get_cookie(); |
ff52cc21 EP |
92 | __u32 old_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_FROM); |
93 | __u32 new_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_TO); | |
59b0df21 | 94 | const unsigned char *new_name = moved->d_name.name; |
0eeca283 | 95 | |
ff52cc21 EP |
96 | if (old_dir == new_dir) |
97 | old_dir_mask |= FS_DN_RENAME; | |
0eeca283 | 98 | |
90586523 | 99 | if (isdir) { |
b29866aa EP |
100 | old_dir_mask |= FS_ISDIR; |
101 | new_dir_mask |= FS_ISDIR; | |
90586523 EP |
102 | } |
103 | ||
47882c6f EP |
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); | |
90586523 | 106 | |
2dfc1cae | 107 | if (target) |
90586523 | 108 | fsnotify_link_count(target); |
89204c40 | 109 | |
2dfc1cae | 110 | if (source) |
47882c6f | 111 | fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
4fa6b5ec | 112 | audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE); |
0eeca283 RL |
113 | } |
114 | ||
3be25f49 EP |
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 | ||
ca9c726e AG |
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 | ||
7a91bf7f JM |
131 | /* |
132 | * fsnotify_nameremove - a filename was removed from a directory | |
133 | */ | |
134 | static inline void fsnotify_nameremove(struct dentry *dentry, int isdir) | |
135 | { | |
90586523 EP |
136 | __u32 mask = FS_DELETE; |
137 | ||
7a91bf7f | 138 | if (isdir) |
b29866aa | 139 | mask |= FS_ISDIR; |
c28f7e56 | 140 | |
28c60e37 | 141 | fsnotify_parent(NULL, dentry, mask); |
7a91bf7f JM |
142 | } |
143 | ||
144 | /* | |
145 | * fsnotify_inoderemove - an inode is going away | |
146 | */ | |
147 | static inline void fsnotify_inoderemove(struct inode *inode) | |
148 | { | |
47882c6f | 149 | fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
3be25f49 | 150 | __fsnotify_inode_delete(inode); |
ece95912 JK |
151 | } |
152 | ||
0eeca283 RL |
153 | /* |
154 | * fsnotify_create - 'name' was linked in | |
155 | */ | |
f38aa942 | 156 | static inline void fsnotify_create(struct inode *inode, struct dentry *dentry) |
0eeca283 | 157 | { |
4fa6b5ec | 158 | audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE); |
90586523 | 159 | |
47882c6f | 160 | fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); |
0eeca283 RL |
161 | } |
162 | ||
ece95912 JK |
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 | { | |
ece95912 | 170 | fsnotify_link_count(inode); |
4fa6b5ec | 171 | audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE); |
90586523 | 172 | |
47882c6f | 173 | fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0); |
ece95912 JK |
174 | } |
175 | ||
0eeca283 RL |
176 | /* |
177 | * fsnotify_mkdir - directory 'name' was created | |
178 | */ | |
f38aa942 | 179 | static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry) |
0eeca283 | 180 | { |
b29866aa | 181 | __u32 mask = (FS_CREATE | FS_ISDIR); |
90586523 EP |
182 | struct inode *d_inode = dentry->d_inode; |
183 | ||
4fa6b5ec | 184 | audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE); |
90586523 | 185 | |
47882c6f | 186 | fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); |
0eeca283 RL |
187 | } |
188 | ||
189 | /* | |
190 | * fsnotify_access - file was read | |
191 | */ | |
2a12a9d7 | 192 | static inline void fsnotify_access(struct file *file) |
0eeca283 | 193 | { |
2069601b | 194 | struct path *path = &file->f_path; |
c77cecee | 195 | struct inode *inode = file_inode(file); |
90586523 | 196 | __u32 mask = FS_ACCESS; |
0eeca283 RL |
197 | |
198 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 199 | mask |= FS_ISDIR; |
0eeca283 | 200 | |
ecf081d1 | 201 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
202 | fsnotify_parent(path, NULL, mask); |
203 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 204 | } |
0eeca283 RL |
205 | } |
206 | ||
207 | /* | |
208 | * fsnotify_modify - file was modified | |
209 | */ | |
2a12a9d7 | 210 | static inline void fsnotify_modify(struct file *file) |
0eeca283 | 211 | { |
2069601b | 212 | struct path *path = &file->f_path; |
c77cecee | 213 | struct inode *inode = file_inode(file); |
90586523 | 214 | __u32 mask = FS_MODIFY; |
0eeca283 RL |
215 | |
216 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 217 | mask |= FS_ISDIR; |
0eeca283 | 218 | |
ecf081d1 | 219 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
220 | fsnotify_parent(path, NULL, mask); |
221 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 222 | } |
0eeca283 RL |
223 | } |
224 | ||
225 | /* | |
226 | * fsnotify_open - file was opened | |
227 | */ | |
2a12a9d7 | 228 | static inline void fsnotify_open(struct file *file) |
0eeca283 | 229 | { |
2069601b | 230 | struct path *path = &file->f_path; |
c77cecee | 231 | struct inode *inode = file_inode(file); |
90586523 | 232 | __u32 mask = FS_OPEN; |
0eeca283 RL |
233 | |
234 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 235 | mask |= FS_ISDIR; |
0eeca283 | 236 | |
6bff7ecc LS |
237 | fsnotify_parent(path, NULL, mask); |
238 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
0eeca283 RL |
239 | } |
240 | ||
241 | /* | |
242 | * fsnotify_close - file was closed | |
243 | */ | |
244 | static inline void fsnotify_close(struct file *file) | |
245 | { | |
2069601b | 246 | struct path *path = &file->f_path; |
496ad9aa | 247 | struct inode *inode = file_inode(file); |
aeb5d727 | 248 | fmode_t mode = file->f_mode; |
90586523 | 249 | __u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE; |
0eeca283 RL |
250 | |
251 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 252 | mask |= FS_ISDIR; |
0eeca283 | 253 | |
ecf081d1 | 254 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
255 | fsnotify_parent(path, NULL, mask); |
256 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 257 | } |
0eeca283 RL |
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; | |
90586523 | 266 | __u32 mask = FS_ATTRIB; |
0eeca283 RL |
267 | |
268 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 269 | mask |= FS_ISDIR; |
0eeca283 | 270 | |
28c60e37 | 271 | fsnotify_parent(NULL, dentry, mask); |
47882c6f | 272 | fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
0eeca283 RL |
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; | |
3c5119c0 EP |
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; | |
0eeca283 | 290 | |
0eeca283 RL |
291 | /* both times implies a utime(s) call */ |
292 | if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) | |
3c5119c0 EP |
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; | |
0eeca283 | 301 | |
3c5119c0 | 302 | if (mask) { |
0eeca283 | 303 | if (S_ISDIR(inode->i_mode)) |
b29866aa | 304 | mask |= FS_ISDIR; |
28c60e37 EP |
305 | |
306 | fsnotify_parent(NULL, dentry, mask); | |
47882c6f | 307 | fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
0eeca283 RL |
308 | } |
309 | } | |
310 | ||
2dfc1cae | 311 | #if defined(CONFIG_FSNOTIFY) /* notify helpers */ |
0eeca283 RL |
312 | |
313 | /* | |
314 | * fsnotify_oldname_init - save off the old filename before we change it | |
315 | */ | |
59b0df21 | 316 | static inline const unsigned char *fsnotify_oldname_init(const unsigned char *name) |
0eeca283 RL |
317 | { |
318 | return kstrdup(name, GFP_KERNEL); | |
319 | } | |
320 | ||
321 | /* | |
322 | * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init | |
323 | */ | |
59b0df21 | 324 | static inline void fsnotify_oldname_free(const unsigned char *old_name) |
0eeca283 RL |
325 | { |
326 | kfree(old_name); | |
327 | } | |
328 | ||
28c60e37 | 329 | #else /* CONFIG_FSNOTIFY */ |
0eeca283 | 330 | |
59b0df21 | 331 | static inline const char *fsnotify_oldname_init(const unsigned char *name) |
0eeca283 RL |
332 | { |
333 | return NULL; | |
334 | } | |
335 | ||
59b0df21 | 336 | static inline void fsnotify_oldname_free(const unsigned char *old_name) |
0eeca283 RL |
337 | { |
338 | } | |
339 | ||
28c60e37 | 340 | #endif /* CONFIG_FSNOTIFY */ |
0eeca283 | 341 | |
0eeca283 | 342 | #endif /* _LINUX_FS_NOTIFY_H */ |