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 path *path, struct dentry *dentry, __u32 mask)
32 dentry = path->dentry;
34 __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;
44 if (file->f_mode & FMODE_NONOTIFY)
46 if (!(mask & (MAY_READ | MAY_OPEN)))
49 fsnotify_mask = FS_ACCESS_PERM;
51 fsnotify_mask = FS_OPEN_PERM;
53 return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
57 * fsnotify_d_move - dentry has been moved
58 * Called with dcache_lock and dentry->d_lock held.
60 static inline void fsnotify_d_move(struct dentry *dentry)
63 * On move we need to update dentry->d_flags to indicate if the new parent
64 * cares about events from this dentry.
66 __fsnotify_update_dcache_flags(dentry);
70 * fsnotify_link_count - inode's link count changed
72 static inline void fsnotify_link_count(struct inode *inode)
74 fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
78 * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
80 static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
81 const unsigned char *old_name,
82 int isdir, struct inode *target, struct dentry *moved)
84 struct inode *source = moved->d_inode;
85 u32 fs_cookie = fsnotify_get_cookie();
86 __u32 old_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_FROM);
87 __u32 new_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_TO);
88 const unsigned char *new_name = moved->d_name.name;
90 if (old_dir == new_dir)
91 old_dir_mask |= FS_DN_RENAME;
94 old_dir_mask |= FS_IN_ISDIR;
95 new_dir_mask |= FS_IN_ISDIR;
98 fsnotify(old_dir, old_dir_mask, old_dir, FSNOTIFY_EVENT_INODE, old_name, fs_cookie);
99 fsnotify(new_dir, new_dir_mask, new_dir, FSNOTIFY_EVENT_INODE, new_name, fs_cookie);
102 fsnotify_link_count(target);
105 fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0);
106 audit_inode_child(moved, new_dir);
110 * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed
112 static inline void fsnotify_inode_delete(struct inode *inode)
114 __fsnotify_inode_delete(inode);
118 * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed
120 static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt)
122 __fsnotify_vfsmount_delete(mnt);
126 * fsnotify_nameremove - a filename was removed from a directory
128 static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
130 __u32 mask = FS_DELETE;
135 fsnotify_parent(NULL, dentry, mask);
139 * fsnotify_inoderemove - an inode is going away
141 static inline void fsnotify_inoderemove(struct inode *inode)
143 fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
144 __fsnotify_inode_delete(inode);
148 * fsnotify_create - 'name' was linked in
150 static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
152 audit_inode_child(dentry, inode);
154 fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
158 * fsnotify_link - new hardlink in 'inode' directory
159 * Note: We have to pass also the linked inode ptr as some filesystems leave
160 * new_dentry->d_inode NULL and instantiate inode pointer later
162 static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
164 fsnotify_link_count(inode);
165 audit_inode_child(new_dentry, dir);
167 fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0);
171 * fsnotify_mkdir - directory 'name' was created
173 static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
175 __u32 mask = (FS_CREATE | FS_IN_ISDIR);
176 struct inode *d_inode = dentry->d_inode;
178 audit_inode_child(dentry, inode);
180 fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
184 * fsnotify_access - file was read
186 static inline void fsnotify_access(struct file *file)
188 struct path *path = &file->f_path;
189 struct inode *inode = 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(path, NULL, mask);
197 fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
202 * fsnotify_modify - file was modified
204 static inline void fsnotify_modify(struct file *file)
206 struct path *path = &file->f_path;
207 struct inode *inode = path->dentry->d_inode;
208 __u32 mask = FS_MODIFY;
210 if (S_ISDIR(inode->i_mode))
213 if (!(file->f_mode & FMODE_NONOTIFY)) {
214 fsnotify_parent(path, NULL, mask);
215 fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
220 * fsnotify_open - file was opened
222 static inline void fsnotify_open(struct file *file)
224 struct path *path = &file->f_path;
225 struct inode *inode = path->dentry->d_inode;
226 __u32 mask = FS_OPEN;
228 if (S_ISDIR(inode->i_mode))
231 if (!(file->f_mode & FMODE_NONOTIFY)) {
232 fsnotify_parent(path, NULL, mask);
233 fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
238 * fsnotify_close - file was closed
240 static inline void fsnotify_close(struct file *file)
242 struct path *path = &file->f_path;
243 struct inode *inode = file->f_path.dentry->d_inode;
244 fmode_t mode = file->f_mode;
245 __u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;
247 if (S_ISDIR(inode->i_mode))
250 if (!(file->f_mode & FMODE_NONOTIFY)) {
251 fsnotify_parent(path, NULL, mask);
252 fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
257 * fsnotify_xattr - extended attributes were changed
259 static inline void fsnotify_xattr(struct dentry *dentry)
261 struct inode *inode = dentry->d_inode;
262 __u32 mask = FS_ATTRIB;
264 if (S_ISDIR(inode->i_mode))
267 fsnotify_parent(NULL, dentry, mask);
268 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
272 * fsnotify_change - notify_change event. file was modified and/or metadata
275 static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
277 struct inode *inode = dentry->d_inode;
280 if (ia_valid & ATTR_UID)
282 if (ia_valid & ATTR_GID)
284 if (ia_valid & ATTR_SIZE)
287 /* both times implies a utime(s) call */
288 if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
290 else if (ia_valid & ATTR_ATIME)
292 else if (ia_valid & ATTR_MTIME)
295 if (ia_valid & ATTR_MODE)
299 if (S_ISDIR(inode->i_mode))
302 fsnotify_parent(NULL, dentry, mask);
303 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
307 #if defined(CONFIG_FSNOTIFY) /* notify helpers */
310 * fsnotify_oldname_init - save off the old filename before we change it
312 static inline const unsigned char *fsnotify_oldname_init(const unsigned char *name)
314 return kstrdup(name, GFP_KERNEL);
318 * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init
320 static inline void fsnotify_oldname_free(const unsigned char *old_name)
325 #else /* CONFIG_FSNOTIFY */
327 static inline const char *fsnotify_oldname_init(const unsigned char *name)
332 static inline void fsnotify_oldname_free(const unsigned char *old_name)
336 #endif /* CONFIG_FSNOTIFY */
338 #endif /* _LINUX_FS_NOTIFY_H */