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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 | ||
6ee8e25f JK |
104 | fsnotify(old_dir, old_dir_mask, source, FSNOTIFY_EVENT_INODE, old_name, |
105 | fs_cookie); | |
106 | fsnotify(new_dir, new_dir_mask, source, FSNOTIFY_EVENT_INODE, new_name, | |
107 | fs_cookie); | |
90586523 | 108 | |
2dfc1cae | 109 | if (target) |
90586523 | 110 | fsnotify_link_count(target); |
89204c40 | 111 | |
2dfc1cae | 112 | if (source) |
47882c6f | 113 | fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
4fa6b5ec | 114 | audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE); |
0eeca283 RL |
115 | } |
116 | ||
3be25f49 EP |
117 | /* |
118 | * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed | |
119 | */ | |
120 | static inline void fsnotify_inode_delete(struct inode *inode) | |
121 | { | |
122 | __fsnotify_inode_delete(inode); | |
123 | } | |
124 | ||
ca9c726e AG |
125 | /* |
126 | * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed | |
127 | */ | |
128 | static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt) | |
129 | { | |
130 | __fsnotify_vfsmount_delete(mnt); | |
131 | } | |
132 | ||
7a91bf7f JM |
133 | /* |
134 | * fsnotify_nameremove - a filename was removed from a directory | |
135 | */ | |
136 | static inline void fsnotify_nameremove(struct dentry *dentry, int isdir) | |
137 | { | |
90586523 EP |
138 | __u32 mask = FS_DELETE; |
139 | ||
7a91bf7f | 140 | if (isdir) |
b29866aa | 141 | mask |= FS_ISDIR; |
c28f7e56 | 142 | |
28c60e37 | 143 | fsnotify_parent(NULL, dentry, mask); |
7a91bf7f JM |
144 | } |
145 | ||
146 | /* | |
147 | * fsnotify_inoderemove - an inode is going away | |
148 | */ | |
149 | static inline void fsnotify_inoderemove(struct inode *inode) | |
150 | { | |
47882c6f | 151 | fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
3be25f49 | 152 | __fsnotify_inode_delete(inode); |
ece95912 JK |
153 | } |
154 | ||
0eeca283 RL |
155 | /* |
156 | * fsnotify_create - 'name' was linked in | |
157 | */ | |
f38aa942 | 158 | static inline void fsnotify_create(struct inode *inode, struct dentry *dentry) |
0eeca283 | 159 | { |
4fa6b5ec | 160 | audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE); |
90586523 | 161 | |
47882c6f | 162 | fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); |
0eeca283 RL |
163 | } |
164 | ||
ece95912 JK |
165 | /* |
166 | * fsnotify_link - new hardlink in 'inode' directory | |
167 | * Note: We have to pass also the linked inode ptr as some filesystems leave | |
168 | * new_dentry->d_inode NULL and instantiate inode pointer later | |
169 | */ | |
170 | static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry) | |
171 | { | |
ece95912 | 172 | fsnotify_link_count(inode); |
4fa6b5ec | 173 | audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE); |
90586523 | 174 | |
47882c6f | 175 | fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0); |
ece95912 JK |
176 | } |
177 | ||
0eeca283 RL |
178 | /* |
179 | * fsnotify_mkdir - directory 'name' was created | |
180 | */ | |
f38aa942 | 181 | static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry) |
0eeca283 | 182 | { |
b29866aa | 183 | __u32 mask = (FS_CREATE | FS_ISDIR); |
90586523 EP |
184 | struct inode *d_inode = dentry->d_inode; |
185 | ||
4fa6b5ec | 186 | audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE); |
90586523 | 187 | |
47882c6f | 188 | fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); |
0eeca283 RL |
189 | } |
190 | ||
191 | /* | |
192 | * fsnotify_access - file was read | |
193 | */ | |
2a12a9d7 | 194 | static inline void fsnotify_access(struct file *file) |
0eeca283 | 195 | { |
2069601b | 196 | struct path *path = &file->f_path; |
c77cecee | 197 | struct inode *inode = file_inode(file); |
90586523 | 198 | __u32 mask = FS_ACCESS; |
0eeca283 RL |
199 | |
200 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 201 | mask |= FS_ISDIR; |
0eeca283 | 202 | |
ecf081d1 | 203 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
204 | fsnotify_parent(path, NULL, mask); |
205 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 206 | } |
0eeca283 RL |
207 | } |
208 | ||
209 | /* | |
210 | * fsnotify_modify - file was modified | |
211 | */ | |
2a12a9d7 | 212 | static inline void fsnotify_modify(struct file *file) |
0eeca283 | 213 | { |
2069601b | 214 | struct path *path = &file->f_path; |
c77cecee | 215 | struct inode *inode = file_inode(file); |
90586523 | 216 | __u32 mask = FS_MODIFY; |
0eeca283 RL |
217 | |
218 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 219 | mask |= FS_ISDIR; |
0eeca283 | 220 | |
ecf081d1 | 221 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
222 | fsnotify_parent(path, NULL, mask); |
223 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 224 | } |
0eeca283 RL |
225 | } |
226 | ||
227 | /* | |
228 | * fsnotify_open - file was opened | |
229 | */ | |
2a12a9d7 | 230 | static inline void fsnotify_open(struct file *file) |
0eeca283 | 231 | { |
2069601b | 232 | struct path *path = &file->f_path; |
c77cecee | 233 | struct inode *inode = file_inode(file); |
90586523 | 234 | __u32 mask = FS_OPEN; |
0eeca283 RL |
235 | |
236 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 237 | mask |= FS_ISDIR; |
0eeca283 | 238 | |
6bff7ecc LS |
239 | fsnotify_parent(path, NULL, mask); |
240 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
0eeca283 RL |
241 | } |
242 | ||
243 | /* | |
244 | * fsnotify_close - file was closed | |
245 | */ | |
246 | static inline void fsnotify_close(struct file *file) | |
247 | { | |
2069601b | 248 | struct path *path = &file->f_path; |
496ad9aa | 249 | struct inode *inode = file_inode(file); |
aeb5d727 | 250 | fmode_t mode = file->f_mode; |
90586523 | 251 | __u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE; |
0eeca283 RL |
252 | |
253 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 254 | mask |= FS_ISDIR; |
0eeca283 | 255 | |
ecf081d1 | 256 | if (!(file->f_mode & FMODE_NONOTIFY)) { |
2069601b LT |
257 | fsnotify_parent(path, NULL, mask); |
258 | fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); | |
ecf081d1 | 259 | } |
0eeca283 RL |
260 | } |
261 | ||
262 | /* | |
263 | * fsnotify_xattr - extended attributes were changed | |
264 | */ | |
265 | static inline void fsnotify_xattr(struct dentry *dentry) | |
266 | { | |
267 | struct inode *inode = dentry->d_inode; | |
90586523 | 268 | __u32 mask = FS_ATTRIB; |
0eeca283 RL |
269 | |
270 | if (S_ISDIR(inode->i_mode)) | |
b29866aa | 271 | mask |= FS_ISDIR; |
0eeca283 | 272 | |
28c60e37 | 273 | fsnotify_parent(NULL, dentry, mask); |
47882c6f | 274 | fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
0eeca283 RL |
275 | } |
276 | ||
277 | /* | |
278 | * fsnotify_change - notify_change event. file was modified and/or metadata | |
279 | * was changed. | |
280 | */ | |
281 | static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid) | |
282 | { | |
283 | struct inode *inode = dentry->d_inode; | |
3c5119c0 EP |
284 | __u32 mask = 0; |
285 | ||
286 | if (ia_valid & ATTR_UID) | |
287 | mask |= FS_ATTRIB; | |
288 | if (ia_valid & ATTR_GID) | |
289 | mask |= FS_ATTRIB; | |
290 | if (ia_valid & ATTR_SIZE) | |
291 | mask |= FS_MODIFY; | |
0eeca283 | 292 | |
0eeca283 RL |
293 | /* both times implies a utime(s) call */ |
294 | if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) | |
3c5119c0 EP |
295 | mask |= FS_ATTRIB; |
296 | else if (ia_valid & ATTR_ATIME) | |
297 | mask |= FS_ACCESS; | |
298 | else if (ia_valid & ATTR_MTIME) | |
299 | mask |= FS_MODIFY; | |
300 | ||
301 | if (ia_valid & ATTR_MODE) | |
302 | mask |= FS_ATTRIB; | |
0eeca283 | 303 | |
3c5119c0 | 304 | if (mask) { |
0eeca283 | 305 | if (S_ISDIR(inode->i_mode)) |
b29866aa | 306 | mask |= FS_ISDIR; |
28c60e37 EP |
307 | |
308 | fsnotify_parent(NULL, dentry, mask); | |
47882c6f | 309 | fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
0eeca283 RL |
310 | } |
311 | } | |
312 | ||
2dfc1cae | 313 | #if defined(CONFIG_FSNOTIFY) /* notify helpers */ |
0eeca283 RL |
314 | |
315 | /* | |
316 | * fsnotify_oldname_init - save off the old filename before we change it | |
317 | */ | |
59b0df21 | 318 | static inline const unsigned char *fsnotify_oldname_init(const unsigned char *name) |
0eeca283 RL |
319 | { |
320 | return kstrdup(name, GFP_KERNEL); | |
321 | } | |
322 | ||
323 | /* | |
324 | * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init | |
325 | */ | |
59b0df21 | 326 | static inline void fsnotify_oldname_free(const unsigned char *old_name) |
0eeca283 RL |
327 | { |
328 | kfree(old_name); | |
329 | } | |
330 | ||
28c60e37 | 331 | #else /* CONFIG_FSNOTIFY */ |
0eeca283 | 332 | |
59b0df21 | 333 | static inline const char *fsnotify_oldname_init(const unsigned char *name) |
0eeca283 RL |
334 | { |
335 | return NULL; | |
336 | } | |
337 | ||
59b0df21 | 338 | static inline void fsnotify_oldname_free(const unsigned char *old_name) |
0eeca283 RL |
339 | { |
340 | } | |
341 | ||
28c60e37 | 342 | #endif /* CONFIG_FSNOTIFY */ |
0eeca283 | 343 | |
0eeca283 | 344 | #endif /* _LINUX_FS_NOTIFY_H */ |