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 the directory entry @dentry.
23 * Unlike fsnotify_parent(), the event will be reported regardless of the
24 * FS_EVENT_ON_CHILD mask on the parent inode.
26 static inline int fsnotify_dirent(struct inode *dir, struct dentry *dentry,
29 return fsnotify(dir, mask, d_inode(dentry), FSNOTIFY_EVENT_INODE,
33 /* Notify this dentry's parent about a child's events. */
34 static inline int fsnotify_parent(const struct path *path,
35 struct dentry *dentry, __u32 mask)
38 dentry = path->dentry;
40 return __fsnotify_parent(path, dentry, mask);
44 * Simple wrappers to consolidate calls fsnotify_parent()/fsnotify() when
45 * an event is on a file/dentry.
47 static inline void fsnotify_dentry(struct dentry *dentry, __u32 mask)
49 struct inode *inode = d_inode(dentry);
51 if (S_ISDIR(inode->i_mode))
54 fsnotify_parent(NULL, dentry, mask);
55 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
58 static inline int fsnotify_file(struct file *file, __u32 mask)
60 const struct path *path = &file->f_path;
61 struct inode *inode = file_inode(file);
64 if (file->f_mode & FMODE_NONOTIFY)
67 if (S_ISDIR(inode->i_mode))
70 ret = fsnotify_parent(path, NULL, mask);
74 return fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
77 /* Simple call site for access decisions */
78 static inline int fsnotify_perm(struct file *file, int mask)
81 __u32 fsnotify_mask = 0;
83 if (!(mask & (MAY_READ | MAY_OPEN)))
86 if (mask & MAY_OPEN) {
87 fsnotify_mask = FS_OPEN_PERM;
89 if (file->f_flags & __FMODE_EXEC) {
90 ret = fsnotify_file(file, FS_OPEN_EXEC_PERM);
95 } else if (mask & MAY_READ) {
96 fsnotify_mask = FS_ACCESS_PERM;
99 return fsnotify_file(file, fsnotify_mask);
103 * fsnotify_link_count - inode's link count changed
105 static inline void fsnotify_link_count(struct inode *inode)
107 __u32 mask = FS_ATTRIB;
109 if (S_ISDIR(inode->i_mode))
112 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
116 * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
118 static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
119 const struct qstr *old_name,
120 int isdir, struct inode *target,
121 struct dentry *moved)
123 struct inode *source = moved->d_inode;
124 u32 fs_cookie = fsnotify_get_cookie();
125 __u32 old_dir_mask = FS_MOVED_FROM;
126 __u32 new_dir_mask = FS_MOVED_TO;
127 __u32 mask = FS_MOVE_SELF;
128 const struct qstr *new_name = &moved->d_name;
130 if (old_dir == new_dir)
131 old_dir_mask |= FS_DN_RENAME;
134 old_dir_mask |= FS_ISDIR;
135 new_dir_mask |= FS_ISDIR;
139 fsnotify(old_dir, old_dir_mask, source, FSNOTIFY_EVENT_INODE, old_name,
141 fsnotify(new_dir, new_dir_mask, source, FSNOTIFY_EVENT_INODE, new_name,
145 fsnotify_link_count(target);
148 fsnotify(source, mask, source, FSNOTIFY_EVENT_INODE, NULL, 0);
149 audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE);
153 * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed
155 static inline void fsnotify_inode_delete(struct inode *inode)
157 __fsnotify_inode_delete(inode);
161 * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed
163 static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt)
165 __fsnotify_vfsmount_delete(mnt);
169 * fsnotify_inoderemove - an inode is going away
171 static inline void fsnotify_inoderemove(struct inode *inode)
173 __u32 mask = FS_DELETE_SELF;
175 if (S_ISDIR(inode->i_mode))
178 fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
179 __fsnotify_inode_delete(inode);
183 * fsnotify_create - 'name' was linked in
185 static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
187 audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
189 fsnotify_dirent(inode, dentry, FS_CREATE);
193 * fsnotify_link - new hardlink in 'inode' directory
194 * Note: We have to pass also the linked inode ptr as some filesystems leave
195 * new_dentry->d_inode NULL and instantiate inode pointer later
197 static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
199 fsnotify_link_count(inode);
200 audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE);
202 fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, &new_dentry->d_name, 0);
206 * fsnotify_unlink - 'name' was unlinked
208 * Caller must make sure that dentry->d_name is stable.
210 static inline void fsnotify_unlink(struct inode *dir, struct dentry *dentry)
212 /* Expected to be called before d_delete() */
213 WARN_ON_ONCE(d_is_negative(dentry));
215 fsnotify_dirent(dir, dentry, FS_DELETE);
219 * fsnotify_mkdir - directory 'name' was created
221 static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
223 audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
225 fsnotify_dirent(inode, dentry, FS_CREATE | FS_ISDIR);
229 * fsnotify_rmdir - directory 'name' was removed
231 * Caller must make sure that dentry->d_name is stable.
233 static inline void fsnotify_rmdir(struct inode *dir, struct dentry *dentry)
235 /* Expected to be called before d_delete() */
236 WARN_ON_ONCE(d_is_negative(dentry));
238 fsnotify_dirent(dir, dentry, FS_DELETE | FS_ISDIR);
242 * fsnotify_access - file was read
244 static inline void fsnotify_access(struct file *file)
246 fsnotify_file(file, FS_ACCESS);
250 * fsnotify_modify - file was modified
252 static inline void fsnotify_modify(struct file *file)
254 fsnotify_file(file, FS_MODIFY);
258 * fsnotify_open - file was opened
260 static inline void fsnotify_open(struct file *file)
262 __u32 mask = FS_OPEN;
264 if (file->f_flags & __FMODE_EXEC)
265 mask |= FS_OPEN_EXEC;
267 fsnotify_file(file, mask);
271 * fsnotify_close - file was closed
273 static inline void fsnotify_close(struct file *file)
275 __u32 mask = (file->f_mode & FMODE_WRITE) ? FS_CLOSE_WRITE :
278 fsnotify_file(file, mask);
282 * fsnotify_xattr - extended attributes were changed
284 static inline void fsnotify_xattr(struct dentry *dentry)
286 fsnotify_dentry(dentry, FS_ATTRIB);
290 * fsnotify_change - notify_change event. file was modified and/or metadata
293 static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
297 if (ia_valid & ATTR_UID)
299 if (ia_valid & ATTR_GID)
301 if (ia_valid & ATTR_SIZE)
304 /* both times implies a utime(s) call */
305 if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
307 else if (ia_valid & ATTR_ATIME)
309 else if (ia_valid & ATTR_MTIME)
312 if (ia_valid & ATTR_MODE)
316 fsnotify_dentry(dentry, mask);
319 #endif /* _LINUX_FS_NOTIFY_H */