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1 #ifndef _LINUX_FS_NOTIFY_H
2 #define _LINUX_FS_NOTIFY_H
5 * include/linux/fsnotify.h - generic hooks for filesystem notification, to
6 * reduce in-source duplication from both dnotify and inotify.
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.
11 * (C) Copyright 2005 Robert Love
14 #include <linux/fsnotify_backend.h>
15 #include <linux/audit.h>
16 #include <linux/slab.h>
17 #include <linux/bug.h>
20 * fsnotify_d_instantiate - instantiate a dentry for inode
22 static inline void fsnotify_d_instantiate(struct dentry
*dentry
,
25 __fsnotify_d_instantiate(dentry
, inode
);
28 /* Notify this dentry's parent about a child's events. */
29 static inline int fsnotify_parent(struct path
*path
, struct dentry
*dentry
, __u32 mask
)
32 dentry
= path
->dentry
;
34 return __fsnotify_parent(path
, dentry
, mask
);
37 /* simple call site for access decisions */
38 static inline int fsnotify_perm(struct file
*file
, int mask
)
40 struct path
*path
= &file
->f_path
;
41 struct inode
*inode
= path
->dentry
->d_inode
;
42 __u32 fsnotify_mask
= 0;
45 if (file
->f_mode
& FMODE_NONOTIFY
)
47 if (!(mask
& (MAY_READ
| MAY_OPEN
)))
50 fsnotify_mask
= FS_OPEN_PERM
;
51 else if (mask
& MAY_READ
)
52 fsnotify_mask
= FS_ACCESS_PERM
;
56 ret
= fsnotify_parent(path
, NULL
, fsnotify_mask
);
60 return fsnotify(inode
, fsnotify_mask
, path
, FSNOTIFY_EVENT_PATH
, NULL
, 0);
64 * fsnotify_d_move - dentry has been moved
66 static inline void fsnotify_d_move(struct dentry
*dentry
)
69 * On move we need to update dentry->d_flags to indicate if the new parent
70 * cares about events from this dentry.
72 __fsnotify_update_dcache_flags(dentry
);
76 * fsnotify_link_count - inode's link count changed
78 static inline void fsnotify_link_count(struct inode
*inode
)
80 fsnotify(inode
, FS_ATTRIB
, inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
84 * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
86 static inline void fsnotify_move(struct inode
*old_dir
, struct inode
*new_dir
,
87 const unsigned char *old_name
,
88 int isdir
, struct inode
*target
, struct dentry
*moved
)
90 struct inode
*source
= moved
->d_inode
;
91 u32 fs_cookie
= fsnotify_get_cookie();
92 __u32 old_dir_mask
= (FS_EVENT_ON_CHILD
| FS_MOVED_FROM
);
93 __u32 new_dir_mask
= (FS_EVENT_ON_CHILD
| FS_MOVED_TO
);
94 const unsigned char *new_name
= moved
->d_name
.name
;
96 if (old_dir
== new_dir
)
97 old_dir_mask
|= FS_DN_RENAME
;
100 old_dir_mask
|= FS_ISDIR
;
101 new_dir_mask
|= FS_ISDIR
;
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
);
108 fsnotify_link_count(target
);
111 fsnotify(source
, FS_MOVE_SELF
, moved
->d_inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
112 audit_inode_child(new_dir
, moved
, AUDIT_TYPE_CHILD_CREATE
);
116 * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed
118 static inline void fsnotify_inode_delete(struct inode
*inode
)
120 __fsnotify_inode_delete(inode
);
124 * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed
126 static inline void fsnotify_vfsmount_delete(struct vfsmount
*mnt
)
128 __fsnotify_vfsmount_delete(mnt
);
132 * fsnotify_nameremove - a filename was removed from a directory
134 static inline void fsnotify_nameremove(struct dentry
*dentry
, int isdir
)
136 __u32 mask
= FS_DELETE
;
141 fsnotify_parent(NULL
, dentry
, mask
);
145 * fsnotify_inoderemove - an inode is going away
147 static inline void fsnotify_inoderemove(struct inode
*inode
)
149 fsnotify(inode
, FS_DELETE_SELF
, inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
150 __fsnotify_inode_delete(inode
);
154 * fsnotify_create - 'name' was linked in
156 static inline void fsnotify_create(struct inode
*inode
, struct dentry
*dentry
)
158 audit_inode_child(inode
, dentry
, AUDIT_TYPE_CHILD_CREATE
);
160 fsnotify(inode
, FS_CREATE
, dentry
->d_inode
, FSNOTIFY_EVENT_INODE
, dentry
->d_name
.name
, 0);
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
168 static inline void fsnotify_link(struct inode
*dir
, struct inode
*inode
, struct dentry
*new_dentry
)
170 fsnotify_link_count(inode
);
171 audit_inode_child(dir
, new_dentry
, AUDIT_TYPE_CHILD_CREATE
);
173 fsnotify(dir
, FS_CREATE
, inode
, FSNOTIFY_EVENT_INODE
, new_dentry
->d_name
.name
, 0);
177 * fsnotify_mkdir - directory 'name' was created
179 static inline void fsnotify_mkdir(struct inode
*inode
, struct dentry
*dentry
)
181 __u32 mask
= (FS_CREATE
| FS_ISDIR
);
182 struct inode
*d_inode
= dentry
->d_inode
;
184 audit_inode_child(inode
, dentry
, AUDIT_TYPE_CHILD_CREATE
);
186 fsnotify(inode
, mask
, d_inode
, FSNOTIFY_EVENT_INODE
, dentry
->d_name
.name
, 0);
190 * fsnotify_access - file was read
192 static inline void fsnotify_access(struct file
*file
)
194 struct path
*path
= &file
->f_path
;
195 struct inode
*inode
= path
->dentry
->d_inode
;
196 __u32 mask
= FS_ACCESS
;
198 if (S_ISDIR(inode
->i_mode
))
201 if (!(file
->f_mode
& FMODE_NONOTIFY
)) {
202 fsnotify_parent(path
, NULL
, mask
);
203 fsnotify(inode
, mask
, path
, FSNOTIFY_EVENT_PATH
, NULL
, 0);
208 * fsnotify_modify - file was modified
210 static inline void fsnotify_modify(struct file
*file
)
212 struct path
*path
= &file
->f_path
;
213 struct inode
*inode
= path
->dentry
->d_inode
;
214 __u32 mask
= FS_MODIFY
;
216 if (S_ISDIR(inode
->i_mode
))
219 if (!(file
->f_mode
& FMODE_NONOTIFY
)) {
220 fsnotify_parent(path
, NULL
, mask
);
221 fsnotify(inode
, mask
, path
, FSNOTIFY_EVENT_PATH
, NULL
, 0);
226 * fsnotify_open - file was opened
228 static inline void fsnotify_open(struct file
*file
)
230 struct path
*path
= &file
->f_path
;
231 struct inode
*inode
= path
->dentry
->d_inode
;
232 __u32 mask
= FS_OPEN
;
234 if (S_ISDIR(inode
->i_mode
))
237 fsnotify_parent(path
, NULL
, mask
);
238 fsnotify(inode
, mask
, path
, FSNOTIFY_EVENT_PATH
, NULL
, 0);
242 * fsnotify_close - file was closed
244 static inline void fsnotify_close(struct file
*file
)
246 struct path
*path
= &file
->f_path
;
247 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
248 fmode_t mode
= file
->f_mode
;
249 __u32 mask
= (mode
& FMODE_WRITE
) ? FS_CLOSE_WRITE
: FS_CLOSE_NOWRITE
;
251 if (S_ISDIR(inode
->i_mode
))
254 if (!(file
->f_mode
& FMODE_NONOTIFY
)) {
255 fsnotify_parent(path
, NULL
, mask
);
256 fsnotify(inode
, mask
, path
, FSNOTIFY_EVENT_PATH
, NULL
, 0);
261 * fsnotify_xattr - extended attributes were changed
263 static inline void fsnotify_xattr(struct dentry
*dentry
)
265 struct inode
*inode
= dentry
->d_inode
;
266 __u32 mask
= FS_ATTRIB
;
268 if (S_ISDIR(inode
->i_mode
))
271 fsnotify_parent(NULL
, dentry
, mask
);
272 fsnotify(inode
, mask
, inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
276 * fsnotify_change - notify_change event. file was modified and/or metadata
279 static inline void fsnotify_change(struct dentry
*dentry
, unsigned int ia_valid
)
281 struct inode
*inode
= dentry
->d_inode
;
284 if (ia_valid
& ATTR_UID
)
286 if (ia_valid
& ATTR_GID
)
288 if (ia_valid
& ATTR_SIZE
)
291 /* both times implies a utime(s) call */
292 if ((ia_valid
& (ATTR_ATIME
| ATTR_MTIME
)) == (ATTR_ATIME
| ATTR_MTIME
))
294 else if (ia_valid
& ATTR_ATIME
)
296 else if (ia_valid
& ATTR_MTIME
)
299 if (ia_valid
& ATTR_MODE
)
303 if (S_ISDIR(inode
->i_mode
))
306 fsnotify_parent(NULL
, dentry
, mask
);
307 fsnotify(inode
, mask
, inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
311 #if defined(CONFIG_FSNOTIFY) /* notify helpers */
314 * fsnotify_oldname_init - save off the old filename before we change it
316 static inline const unsigned char *fsnotify_oldname_init(const unsigned char *name
)
318 return kstrdup(name
, GFP_KERNEL
);
322 * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init
324 static inline void fsnotify_oldname_free(const unsigned char *old_name
)
329 #else /* CONFIG_FSNOTIFY */
331 static inline const char *fsnotify_oldname_init(const unsigned char *name
)
336 static inline void fsnotify_oldname_free(const unsigned char *old_name
)
340 #endif /* CONFIG_FSNOTIFY */
342 #endif /* _LINUX_FS_NOTIFY_H */