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>
19 * fsnotify_d_instantiate - instantiate a dentry for inode
20 * Called with dcache_lock held.
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
65 * Called with dcache_lock and dentry->d_lock held.
67 static inline void fsnotify_d_move(struct dentry
*dentry
)
70 * On move we need to update dentry->d_flags to indicate if the new parent
71 * cares about events from this dentry.
73 __fsnotify_update_dcache_flags(dentry
);
77 * fsnotify_link_count - inode's link count changed
79 static inline void fsnotify_link_count(struct inode
*inode
)
81 fsnotify(inode
, FS_ATTRIB
, inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
85 * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
87 static inline void fsnotify_move(struct inode
*old_dir
, struct inode
*new_dir
,
88 const unsigned char *old_name
,
89 int isdir
, struct inode
*target
, struct dentry
*moved
)
91 struct inode
*source
= moved
->d_inode
;
92 u32 fs_cookie
= fsnotify_get_cookie();
93 __u32 old_dir_mask
= (FS_EVENT_ON_CHILD
| FS_MOVED_FROM
);
94 __u32 new_dir_mask
= (FS_EVENT_ON_CHILD
| FS_MOVED_TO
);
95 const unsigned char *new_name
= moved
->d_name
.name
;
97 if (old_dir
== new_dir
)
98 old_dir_mask
|= FS_DN_RENAME
;
101 old_dir_mask
|= FS_ISDIR
;
102 new_dir_mask
|= FS_ISDIR
;
105 fsnotify(old_dir
, old_dir_mask
, old_dir
, FSNOTIFY_EVENT_INODE
, old_name
, fs_cookie
);
106 fsnotify(new_dir
, new_dir_mask
, new_dir
, FSNOTIFY_EVENT_INODE
, new_name
, fs_cookie
);
109 fsnotify_link_count(target
);
112 fsnotify(source
, FS_MOVE_SELF
, moved
->d_inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
113 audit_inode_child(moved
, new_dir
);
117 * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed
119 static inline void fsnotify_inode_delete(struct inode
*inode
)
121 __fsnotify_inode_delete(inode
);
125 * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed
127 static inline void fsnotify_vfsmount_delete(struct vfsmount
*mnt
)
129 __fsnotify_vfsmount_delete(mnt
);
133 * fsnotify_nameremove - a filename was removed from a directory
135 static inline void fsnotify_nameremove(struct dentry
*dentry
, int isdir
)
137 __u32 mask
= FS_DELETE
;
142 fsnotify_parent(NULL
, dentry
, mask
);
146 * fsnotify_inoderemove - an inode is going away
148 static inline void fsnotify_inoderemove(struct inode
*inode
)
150 fsnotify(inode
, FS_DELETE_SELF
, inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
151 __fsnotify_inode_delete(inode
);
155 * fsnotify_create - 'name' was linked in
157 static inline void fsnotify_create(struct inode
*inode
, struct dentry
*dentry
)
159 audit_inode_child(dentry
, inode
);
161 fsnotify(inode
, FS_CREATE
, dentry
->d_inode
, FSNOTIFY_EVENT_INODE
, dentry
->d_name
.name
, 0);
165 * fsnotify_link - new hardlink in 'inode' directory
166 * Note: We have to pass also the linked inode ptr as some filesystems leave
167 * new_dentry->d_inode NULL and instantiate inode pointer later
169 static inline void fsnotify_link(struct inode
*dir
, struct inode
*inode
, struct dentry
*new_dentry
)
171 fsnotify_link_count(inode
);
172 audit_inode_child(new_dentry
, dir
);
174 fsnotify(dir
, FS_CREATE
, inode
, FSNOTIFY_EVENT_INODE
, new_dentry
->d_name
.name
, 0);
178 * fsnotify_mkdir - directory 'name' was created
180 static inline void fsnotify_mkdir(struct inode
*inode
, struct dentry
*dentry
)
182 __u32 mask
= (FS_CREATE
| FS_ISDIR
);
183 struct inode
*d_inode
= dentry
->d_inode
;
185 audit_inode_child(dentry
, inode
);
187 fsnotify(inode
, mask
, d_inode
, FSNOTIFY_EVENT_INODE
, dentry
->d_name
.name
, 0);
191 * fsnotify_access - file was read
193 static inline void fsnotify_access(struct file
*file
)
195 struct path
*path
= &file
->f_path
;
196 struct inode
*inode
= path
->dentry
->d_inode
;
197 __u32 mask
= FS_ACCESS
;
199 if (S_ISDIR(inode
->i_mode
))
202 if (!(file
->f_mode
& FMODE_NONOTIFY
)) {
203 fsnotify_parent(path
, NULL
, mask
);
204 fsnotify(inode
, mask
, path
, FSNOTIFY_EVENT_PATH
, NULL
, 0);
209 * fsnotify_modify - file was modified
211 static inline void fsnotify_modify(struct file
*file
)
213 struct path
*path
= &file
->f_path
;
214 struct inode
*inode
= path
->dentry
->d_inode
;
215 __u32 mask
= FS_MODIFY
;
217 if (S_ISDIR(inode
->i_mode
))
220 if (!(file
->f_mode
& FMODE_NONOTIFY
)) {
221 fsnotify_parent(path
, NULL
, mask
);
222 fsnotify(inode
, mask
, path
, FSNOTIFY_EVENT_PATH
, NULL
, 0);
227 * fsnotify_open - file was opened
229 static inline void fsnotify_open(struct file
*file
)
231 struct path
*path
= &file
->f_path
;
232 struct inode
*inode
= path
->dentry
->d_inode
;
233 __u32 mask
= FS_OPEN
;
235 if (S_ISDIR(inode
->i_mode
))
238 /* FMODE_NONOTIFY must never be set from user */
239 file
->f_mode
&= ~FMODE_NONOTIFY
;
241 fsnotify_parent(path
, NULL
, mask
);
242 fsnotify(inode
, mask
, path
, FSNOTIFY_EVENT_PATH
, NULL
, 0);
246 * fsnotify_close - file was closed
248 static inline void fsnotify_close(struct file
*file
)
250 struct path
*path
= &file
->f_path
;
251 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
252 fmode_t mode
= file
->f_mode
;
253 __u32 mask
= (mode
& FMODE_WRITE
) ? FS_CLOSE_WRITE
: FS_CLOSE_NOWRITE
;
255 if (S_ISDIR(inode
->i_mode
))
258 if (!(file
->f_mode
& FMODE_NONOTIFY
)) {
259 fsnotify_parent(path
, NULL
, mask
);
260 fsnotify(inode
, mask
, path
, FSNOTIFY_EVENT_PATH
, NULL
, 0);
265 * fsnotify_xattr - extended attributes were changed
267 static inline void fsnotify_xattr(struct dentry
*dentry
)
269 struct inode
*inode
= dentry
->d_inode
;
270 __u32 mask
= FS_ATTRIB
;
272 if (S_ISDIR(inode
->i_mode
))
275 fsnotify_parent(NULL
, dentry
, mask
);
276 fsnotify(inode
, mask
, inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
280 * fsnotify_change - notify_change event. file was modified and/or metadata
283 static inline void fsnotify_change(struct dentry
*dentry
, unsigned int ia_valid
)
285 struct inode
*inode
= dentry
->d_inode
;
288 if (ia_valid
& ATTR_UID
)
290 if (ia_valid
& ATTR_GID
)
292 if (ia_valid
& ATTR_SIZE
)
295 /* both times implies a utime(s) call */
296 if ((ia_valid
& (ATTR_ATIME
| ATTR_MTIME
)) == (ATTR_ATIME
| ATTR_MTIME
))
298 else if (ia_valid
& ATTR_ATIME
)
300 else if (ia_valid
& ATTR_MTIME
)
303 if (ia_valid
& ATTR_MODE
)
307 if (S_ISDIR(inode
->i_mode
))
310 fsnotify_parent(NULL
, dentry
, mask
);
311 fsnotify(inode
, mask
, inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
315 #if defined(CONFIG_FSNOTIFY) /* notify helpers */
318 * fsnotify_oldname_init - save off the old filename before we change it
320 static inline const unsigned char *fsnotify_oldname_init(const unsigned char *name
)
322 return kstrdup(name
, GFP_KERNEL
);
326 * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init
328 static inline void fsnotify_oldname_free(const unsigned char *old_name
)
333 #else /* CONFIG_FSNOTIFY */
335 static inline const char *fsnotify_oldname_init(const unsigned char *name
)
340 static inline void fsnotify_oldname_free(const unsigned char *old_name
)
344 #endif /* CONFIG_FSNOTIFY */
346 #endif /* _LINUX_FS_NOTIFY_H */