1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_FS_NOTIFY_H
3 #define _LINUX_FS_NOTIFY_H
6 * include/linux/fsnotify.h - generic hooks for filesystem notification, to
7 * reduce in-source duplication from both dnotify and inotify.
9 * We don't compile any of this away in some complicated menagerie of ifdefs.
10 * Instead, we rely on the code inside to optimize away as needed.
12 * (C) Copyright 2005 Robert Love
15 #include <linux/fsnotify_backend.h>
16 #include <linux/audit.h>
17 #include <linux/slab.h>
18 #include <linux/bug.h>
21 * Notify this @dir inode about a change in a child directory entry.
22 * The directory entry may have turned positive or negative or its inode may
23 * have changed (i.e. renamed over).
25 * Unlike fsnotify_parent(), the event will be reported regardless of the
26 * FS_EVENT_ON_CHILD mask on the parent inode.
28 static inline void fsnotify_name(struct inode *dir, __u32 mask,
30 const struct qstr *name, u32 cookie)
32 fsnotify(dir, mask, child, FSNOTIFY_EVENT_INODE, name, cookie);
34 * Send another flavor of the event without child inode data and
35 * without the specific event type (e.g. FS_CREATE|FS_IS_DIR).
36 * The name is relative to the dir inode the event is reported to.
38 fsnotify(dir, FS_DIR_MODIFY, dir, FSNOTIFY_EVENT_INODE, name, 0);
41 static inline void fsnotify_dirent(struct inode *dir, struct dentry *dentry,
44 fsnotify_name(dir, mask, d_inode(dentry), &dentry->d_name, 0);
47 /* Notify this dentry's parent about a child's events. */
48 static inline int fsnotify_parent(struct dentry *dentry, __u32 mask,
49 const void *data, int data_type)
51 struct inode *inode = d_inode(dentry);
53 if (S_ISDIR(inode->i_mode))
56 if (!(dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED))
59 return __fsnotify_parent(dentry, mask, data, data_type);
62 return fsnotify(inode, mask, data, data_type, NULL, 0);
66 * Simple wrappers to consolidate calls to fsnotify_parent() when an event
67 * is on a file/dentry.
69 static inline void fsnotify_dentry(struct dentry *dentry, __u32 mask)
71 fsnotify_parent(dentry, mask, d_inode(dentry), FSNOTIFY_EVENT_INODE);
74 static inline int fsnotify_file(struct file *file, __u32 mask)
76 const struct path *path = &file->f_path;
78 if (file->f_mode & FMODE_NONOTIFY)
81 return fsnotify_parent(path->dentry, mask, path, FSNOTIFY_EVENT_PATH);
84 /* Simple call site for access decisions */
85 static inline int fsnotify_perm(struct file *file, int mask)
88 __u32 fsnotify_mask = 0;
90 if (!(mask & (MAY_READ | MAY_OPEN)))
93 if (mask & MAY_OPEN) {
94 fsnotify_mask = FS_OPEN_PERM;
96 if (file->f_flags & __FMODE_EXEC) {
97 ret = fsnotify_file(file, FS_OPEN_EXEC_PERM);
102 } else if (mask & MAY_READ) {
103 fsnotify_mask = FS_ACCESS_PERM;
106 return fsnotify_file(file, fsnotify_mask);
110 * fsnotify_link_count - inode's link count changed
112 static inline void fsnotify_link_count(struct inode *inode)
114 __u32 mask = FS_ATTRIB;
116 if (S_ISDIR(inode->i_mode))
119 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
123 * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
125 static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
126 const struct qstr *old_name,
127 int isdir, struct inode *target,
128 struct dentry *moved)
130 struct inode *source = moved->d_inode;
131 u32 fs_cookie = fsnotify_get_cookie();
132 __u32 old_dir_mask = FS_MOVED_FROM;
133 __u32 new_dir_mask = FS_MOVED_TO;
134 __u32 mask = FS_MOVE_SELF;
135 const struct qstr *new_name = &moved->d_name;
137 if (old_dir == new_dir)
138 old_dir_mask |= FS_DN_RENAME;
141 old_dir_mask |= FS_ISDIR;
142 new_dir_mask |= FS_ISDIR;
146 fsnotify_name(old_dir, old_dir_mask, source, old_name, fs_cookie);
147 fsnotify_name(new_dir, new_dir_mask, source, new_name, fs_cookie);
150 fsnotify_link_count(target);
153 fsnotify(source, mask, source, FSNOTIFY_EVENT_INODE, NULL, 0);
154 audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE);
158 * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed
160 static inline void fsnotify_inode_delete(struct inode *inode)
162 __fsnotify_inode_delete(inode);
166 * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed
168 static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt)
170 __fsnotify_vfsmount_delete(mnt);
174 * fsnotify_inoderemove - an inode is going away
176 static inline void fsnotify_inoderemove(struct inode *inode)
178 __u32 mask = FS_DELETE_SELF;
180 if (S_ISDIR(inode->i_mode))
183 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
184 __fsnotify_inode_delete(inode);
188 * fsnotify_create - 'name' was linked in
190 static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
192 audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
194 fsnotify_dirent(inode, dentry, FS_CREATE);
198 * fsnotify_link - new hardlink in 'inode' directory
199 * Note: We have to pass also the linked inode ptr as some filesystems leave
200 * new_dentry->d_inode NULL and instantiate inode pointer later
202 static inline void fsnotify_link(struct inode *dir, struct inode *inode,
203 struct dentry *new_dentry)
205 fsnotify_link_count(inode);
206 audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE);
208 fsnotify_name(dir, FS_CREATE, inode, &new_dentry->d_name, 0);
212 * fsnotify_unlink - 'name' was unlinked
214 * Caller must make sure that dentry->d_name is stable.
216 static inline void fsnotify_unlink(struct inode *dir, struct dentry *dentry)
218 /* Expected to be called before d_delete() */
219 WARN_ON_ONCE(d_is_negative(dentry));
221 fsnotify_dirent(dir, dentry, FS_DELETE);
225 * fsnotify_mkdir - directory 'name' was created
227 static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
229 audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
231 fsnotify_dirent(inode, dentry, FS_CREATE | FS_ISDIR);
235 * fsnotify_rmdir - directory 'name' was removed
237 * Caller must make sure that dentry->d_name is stable.
239 static inline void fsnotify_rmdir(struct inode *dir, struct dentry *dentry)
241 /* Expected to be called before d_delete() */
242 WARN_ON_ONCE(d_is_negative(dentry));
244 fsnotify_dirent(dir, dentry, FS_DELETE | FS_ISDIR);
248 * fsnotify_access - file was read
250 static inline void fsnotify_access(struct file *file)
252 fsnotify_file(file, FS_ACCESS);
256 * fsnotify_modify - file was modified
258 static inline void fsnotify_modify(struct file *file)
260 fsnotify_file(file, FS_MODIFY);
264 * fsnotify_open - file was opened
266 static inline void fsnotify_open(struct file *file)
268 __u32 mask = FS_OPEN;
270 if (file->f_flags & __FMODE_EXEC)
271 mask |= FS_OPEN_EXEC;
273 fsnotify_file(file, mask);
277 * fsnotify_close - file was closed
279 static inline void fsnotify_close(struct file *file)
281 __u32 mask = (file->f_mode & FMODE_WRITE) ? FS_CLOSE_WRITE :
284 fsnotify_file(file, mask);
288 * fsnotify_xattr - extended attributes were changed
290 static inline void fsnotify_xattr(struct dentry *dentry)
292 fsnotify_dentry(dentry, FS_ATTRIB);
296 * fsnotify_change - notify_change event. file was modified and/or metadata
299 static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
303 if (ia_valid & ATTR_UID)
305 if (ia_valid & ATTR_GID)
307 if (ia_valid & ATTR_SIZE)
310 /* both times implies a utime(s) call */
311 if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
313 else if (ia_valid & ATTR_ATIME)
315 else if (ia_valid & ATTR_MTIME)
318 if (ia_valid & ATTR_MODE)
322 fsnotify_dentry(dentry, mask);
325 #endif /* _LINUX_FS_NOTIFY_H */