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>
19 /* Notify this dentry's parent about a child's events. */
20 static inline int fsnotify_parent(struct path
*path
, struct dentry
*dentry
, __u32 mask
)
23 dentry
= path
->dentry
;
25 return __fsnotify_parent(path
, dentry
, mask
);
28 /* simple call site for access decisions */
29 static inline int fsnotify_perm(struct file
*file
, int mask
)
31 struct path
*path
= &file
->f_path
;
32 struct inode
*inode
= file_inode(file
);
33 __u32 fsnotify_mask
= 0;
36 if (file
->f_mode
& FMODE_NONOTIFY
)
38 if (!(mask
& (MAY_READ
| MAY_OPEN
)))
41 fsnotify_mask
= FS_OPEN_PERM
;
42 else if (mask
& MAY_READ
)
43 fsnotify_mask
= FS_ACCESS_PERM
;
47 ret
= fsnotify_parent(path
, NULL
, fsnotify_mask
);
51 return fsnotify(inode
, fsnotify_mask
, path
, FSNOTIFY_EVENT_PATH
, NULL
, 0);
55 * fsnotify_d_move - dentry has been moved
57 static inline void fsnotify_d_move(struct dentry
*dentry
)
60 * On move we need to update dentry->d_flags to indicate if the new parent
61 * cares about events from this dentry.
63 __fsnotify_update_dcache_flags(dentry
);
67 * fsnotify_link_count - inode's link count changed
69 static inline void fsnotify_link_count(struct inode
*inode
)
71 fsnotify(inode
, FS_ATTRIB
, inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
75 * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
77 static inline void fsnotify_move(struct inode
*old_dir
, struct inode
*new_dir
,
78 const unsigned char *old_name
,
79 int isdir
, struct inode
*target
, struct dentry
*moved
)
81 struct inode
*source
= moved
->d_inode
;
82 u32 fs_cookie
= fsnotify_get_cookie();
83 __u32 old_dir_mask
= (FS_EVENT_ON_CHILD
| FS_MOVED_FROM
);
84 __u32 new_dir_mask
= (FS_EVENT_ON_CHILD
| FS_MOVED_TO
);
85 const unsigned char *new_name
= moved
->d_name
.name
;
87 if (old_dir
== new_dir
)
88 old_dir_mask
|= FS_DN_RENAME
;
91 old_dir_mask
|= FS_ISDIR
;
92 new_dir_mask
|= FS_ISDIR
;
95 fsnotify(old_dir
, old_dir_mask
, source
, FSNOTIFY_EVENT_INODE
, old_name
,
97 fsnotify(new_dir
, new_dir_mask
, source
, FSNOTIFY_EVENT_INODE
, new_name
,
101 fsnotify_link_count(target
);
104 fsnotify(source
, FS_MOVE_SELF
, moved
->d_inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
105 audit_inode_child(new_dir
, moved
, AUDIT_TYPE_CHILD_CREATE
);
109 * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed
111 static inline void fsnotify_inode_delete(struct inode
*inode
)
113 __fsnotify_inode_delete(inode
);
117 * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed
119 static inline void fsnotify_vfsmount_delete(struct vfsmount
*mnt
)
121 __fsnotify_vfsmount_delete(mnt
);
125 * fsnotify_nameremove - a filename was removed from a directory
127 static inline void fsnotify_nameremove(struct dentry
*dentry
, int isdir
)
129 __u32 mask
= FS_DELETE
;
134 fsnotify_parent(NULL
, dentry
, mask
);
138 * fsnotify_inoderemove - an inode is going away
140 static inline void fsnotify_inoderemove(struct inode
*inode
)
142 fsnotify(inode
, FS_DELETE_SELF
, inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
143 __fsnotify_inode_delete(inode
);
147 * fsnotify_create - 'name' was linked in
149 static inline void fsnotify_create(struct inode
*inode
, struct dentry
*dentry
)
151 audit_inode_child(inode
, dentry
, AUDIT_TYPE_CHILD_CREATE
);
153 fsnotify(inode
, FS_CREATE
, dentry
->d_inode
, FSNOTIFY_EVENT_INODE
, dentry
->d_name
.name
, 0);
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
161 static inline void fsnotify_link(struct inode
*dir
, struct inode
*inode
, struct dentry
*new_dentry
)
163 fsnotify_link_count(inode
);
164 audit_inode_child(dir
, new_dentry
, AUDIT_TYPE_CHILD_CREATE
);
166 fsnotify(dir
, FS_CREATE
, inode
, FSNOTIFY_EVENT_INODE
, new_dentry
->d_name
.name
, 0);
170 * fsnotify_mkdir - directory 'name' was created
172 static inline void fsnotify_mkdir(struct inode
*inode
, struct dentry
*dentry
)
174 __u32 mask
= (FS_CREATE
| FS_ISDIR
);
175 struct inode
*d_inode
= dentry
->d_inode
;
177 audit_inode_child(inode
, dentry
, AUDIT_TYPE_CHILD_CREATE
);
179 fsnotify(inode
, mask
, d_inode
, FSNOTIFY_EVENT_INODE
, dentry
->d_name
.name
, 0);
183 * fsnotify_access - file was read
185 static inline void fsnotify_access(struct file
*file
)
187 struct path
*path
= &file
->f_path
;
188 struct inode
*inode
= file_inode(file
);
189 __u32 mask
= FS_ACCESS
;
191 if (S_ISDIR(inode
->i_mode
))
194 if (!(file
->f_mode
& FMODE_NONOTIFY
)) {
195 fsnotify_parent(path
, NULL
, mask
);
196 fsnotify(inode
, mask
, path
, FSNOTIFY_EVENT_PATH
, NULL
, 0);
201 * fsnotify_modify - file was modified
203 static inline void fsnotify_modify(struct file
*file
)
205 struct path
*path
= &file
->f_path
;
206 struct inode
*inode
= file_inode(file
);
207 __u32 mask
= FS_MODIFY
;
209 if (S_ISDIR(inode
->i_mode
))
212 if (!(file
->f_mode
& FMODE_NONOTIFY
)) {
213 fsnotify_parent(path
, NULL
, mask
);
214 fsnotify(inode
, mask
, path
, FSNOTIFY_EVENT_PATH
, NULL
, 0);
219 * fsnotify_open - file was opened
221 static inline void fsnotify_open(struct file
*file
)
223 struct path
*path
= &file
->f_path
;
224 struct inode
*inode
= file_inode(file
);
225 __u32 mask
= FS_OPEN
;
227 if (S_ISDIR(inode
->i_mode
))
230 fsnotify_parent(path
, NULL
, mask
);
231 fsnotify(inode
, mask
, path
, FSNOTIFY_EVENT_PATH
, NULL
, 0);
235 * fsnotify_close - file was closed
237 static inline void fsnotify_close(struct file
*file
)
239 struct path
*path
= &file
->f_path
;
240 struct inode
*inode
= file_inode(file
);
241 fmode_t mode
= file
->f_mode
;
242 __u32 mask
= (mode
& FMODE_WRITE
) ? FS_CLOSE_WRITE
: FS_CLOSE_NOWRITE
;
244 if (S_ISDIR(inode
->i_mode
))
247 if (!(file
->f_mode
& FMODE_NONOTIFY
)) {
248 fsnotify_parent(path
, NULL
, mask
);
249 fsnotify(inode
, mask
, path
, FSNOTIFY_EVENT_PATH
, NULL
, 0);
254 * fsnotify_xattr - extended attributes were changed
256 static inline void fsnotify_xattr(struct dentry
*dentry
)
258 struct inode
*inode
= dentry
->d_inode
;
259 __u32 mask
= FS_ATTRIB
;
261 if (S_ISDIR(inode
->i_mode
))
264 fsnotify_parent(NULL
, dentry
, mask
);
265 fsnotify(inode
, mask
, inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
269 * fsnotify_change - notify_change event. file was modified and/or metadata
272 static inline void fsnotify_change(struct dentry
*dentry
, unsigned int ia_valid
)
274 struct inode
*inode
= dentry
->d_inode
;
277 if (ia_valid
& ATTR_UID
)
279 if (ia_valid
& ATTR_GID
)
281 if (ia_valid
& ATTR_SIZE
)
284 /* both times implies a utime(s) call */
285 if ((ia_valid
& (ATTR_ATIME
| ATTR_MTIME
)) == (ATTR_ATIME
| ATTR_MTIME
))
287 else if (ia_valid
& ATTR_ATIME
)
289 else if (ia_valid
& ATTR_MTIME
)
292 if (ia_valid
& ATTR_MODE
)
296 if (S_ISDIR(inode
->i_mode
))
299 fsnotify_parent(NULL
, dentry
, mask
);
300 fsnotify(inode
, mask
, inode
, FSNOTIFY_EVENT_INODE
, NULL
, 0);
304 #if defined(CONFIG_FSNOTIFY) /* notify helpers */
307 * fsnotify_oldname_init - save off the old filename before we change it
309 static inline const unsigned char *fsnotify_oldname_init(const unsigned char *name
)
311 return kstrdup(name
, GFP_KERNEL
);
315 * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init
317 static inline void fsnotify_oldname_free(const unsigned char *old_name
)
322 #else /* CONFIG_FSNOTIFY */
324 static inline const char *fsnotify_oldname_init(const unsigned char *name
)
329 static inline void fsnotify_oldname_free(const unsigned char *old_name
)
333 #endif /* CONFIG_FSNOTIFY */
335 #endif /* _LINUX_FS_NOTIFY_H */
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