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 void fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask)
32 dentry = file->f_path.dentry;
34 __fsnotify_parent(file, dentry, mask);
37 /* simple call site for access decisions */
38 static inline int fsnotify_perm(struct file *file, int mask)
40 struct inode *inode = file->f_path.dentry->d_inode;
41 __u32 fsnotify_mask = 0;
43 if (file->f_mode & FMODE_NONOTIFY)
45 if (!(mask & (MAY_READ | MAY_OPEN)))
48 fsnotify_mask = FS_OPEN_PERM;
49 else if (mask & MAY_READ)
50 fsnotify_mask = FS_ACCESS_PERM;
54 return fsnotify(inode, fsnotify_mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
58 * fsnotify_d_move - dentry has been moved
59 * Called with dcache_lock and dentry->d_lock held.
61 static inline void fsnotify_d_move(struct dentry *dentry)
64 * On move we need to update dentry->d_flags to indicate if the new parent
65 * cares about events from this dentry.
67 __fsnotify_update_dcache_flags(dentry);
71 * fsnotify_link_count - inode's link count changed
73 static inline void fsnotify_link_count(struct inode *inode)
75 fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
79 * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
81 static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
82 const unsigned char *old_name,
83 int isdir, struct inode *target, struct dentry *moved)
85 struct inode *source = moved->d_inode;
86 u32 fs_cookie = fsnotify_get_cookie();
87 __u32 old_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_FROM);
88 __u32 new_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_TO);
89 const unsigned char *new_name = moved->d_name.name;
91 if (old_dir == new_dir)
92 old_dir_mask |= FS_DN_RENAME;
95 old_dir_mask |= FS_IN_ISDIR;
96 new_dir_mask |= FS_IN_ISDIR;
99 fsnotify(old_dir, old_dir_mask, old_dir, FSNOTIFY_EVENT_INODE, old_name, fs_cookie);
100 fsnotify(new_dir, new_dir_mask, new_dir, FSNOTIFY_EVENT_INODE, new_name, fs_cookie);
103 fsnotify_link_count(target);
106 fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0);
107 audit_inode_child(moved, new_dir);
111 * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed
113 static inline void fsnotify_inode_delete(struct inode *inode)
115 __fsnotify_inode_delete(inode);
119 * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed
121 static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt)
123 __fsnotify_vfsmount_delete(mnt);
127 * fsnotify_nameremove - a filename was removed from a directory
129 static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
131 __u32 mask = FS_DELETE;
136 fsnotify_parent(NULL, dentry, mask);
140 * fsnotify_inoderemove - an inode is going away
142 static inline void fsnotify_inoderemove(struct inode *inode)
144 fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
145 __fsnotify_inode_delete(inode);
149 * fsnotify_create - 'name' was linked in
151 static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
153 audit_inode_child(dentry, inode);
155 fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
159 * fsnotify_link - new hardlink in 'inode' directory
160 * Note: We have to pass also the linked inode ptr as some filesystems leave
161 * new_dentry->d_inode NULL and instantiate inode pointer later
163 static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
165 fsnotify_link_count(inode);
166 audit_inode_child(new_dentry, dir);
168 fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0);
172 * fsnotify_mkdir - directory 'name' was created
174 static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
176 __u32 mask = (FS_CREATE | FS_IN_ISDIR);
177 struct inode *d_inode = dentry->d_inode;
179 audit_inode_child(dentry, inode);
181 fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
185 * fsnotify_access - file was read
187 static inline void fsnotify_access(struct file *file)
189 struct inode *inode = file->f_path.dentry->d_inode;
190 __u32 mask = FS_ACCESS;
192 if (S_ISDIR(inode->i_mode))
195 if (!(file->f_mode & FMODE_NONOTIFY)) {
196 fsnotify_parent(file, NULL, mask);
197 fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
202 * fsnotify_modify - file was modified
204 static inline void fsnotify_modify(struct file *file)
206 struct inode *inode = file->f_path.dentry->d_inode;
207 __u32 mask = FS_MODIFY;
209 if (S_ISDIR(inode->i_mode))
212 if (!(file->f_mode & FMODE_NONOTIFY)) {
213 fsnotify_parent(file, NULL, mask);
214 fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
219 * fsnotify_open - file was opened
221 static inline void fsnotify_open(struct file *file)
223 struct inode *inode = file->f_path.dentry->d_inode;
224 __u32 mask = FS_OPEN;
226 if (S_ISDIR(inode->i_mode))
229 if (!(file->f_mode & FMODE_NONOTIFY)) {
230 fsnotify_parent(file, NULL, mask);
231 fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
236 * fsnotify_close - file was closed
238 static inline void fsnotify_close(struct file *file)
240 struct inode *inode = file->f_path.dentry->d_inode;
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(file, NULL, mask);
249 fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, 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 */