1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <linux/fsnotify_backend.h>
3 #include <linux/inotify.h>
4 #include <linux/slab.h> /* struct kmem_cache */
5 
6 struct inotify_event_info {
7 	struct fsnotify_event fse;
8 	u32 mask;
9 	int wd;
10 	u32 sync_cookie;
11 	int name_len;
12 	char name[];
13 };
14 
15 struct inotify_inode_mark {
16 	struct fsnotify_mark fsn_mark;
17 	int wd;
18 };
19 
INOTIFY_E(struct fsnotify_event * fse)20 static inline struct inotify_event_info *INOTIFY_E(struct fsnotify_event *fse)
21 {
22 	return container_of(fse, struct inotify_event_info, fse);
23 }
24 
25 /*
26  * INOTIFY_USER_FLAGS represents all of the mask bits that we expose to
27  * userspace.  There is at least one bit (FS_EVENT_ON_CHILD) which is
28  * used only internally to the kernel.
29  */
30 #define INOTIFY_USER_MASK (IN_ALL_EVENTS)
31 
inotify_mark_user_mask(struct fsnotify_mark * fsn_mark)32 static inline __u32 inotify_mark_user_mask(struct fsnotify_mark *fsn_mark)
33 {
34 	__u32 mask = fsn_mark->mask & INOTIFY_USER_MASK;
35 
36 	if (fsn_mark->flags & FSNOTIFY_MARK_FLAG_EXCL_UNLINK)
37 		mask |= IN_EXCL_UNLINK;
38 	if (fsn_mark->flags & FSNOTIFY_MARK_FLAG_IN_ONESHOT)
39 		mask |= IN_ONESHOT;
40 
41 	return mask;
42 }
43 
44 extern void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark,
45 					   struct fsnotify_group *group);
46 extern int inotify_handle_inode_event(struct fsnotify_mark *inode_mark,
47 				      u32 mask, struct inode *inode,
48 				      struct inode *dir,
49 				      const struct qstr *name, u32 cookie);
50 
51 extern const struct fsnotify_ops inotify_fsnotify_ops;
52 extern struct kmem_cache *inotify_inode_mark_cachep;
53 
54 #ifdef CONFIG_INOTIFY_USER
dec_inotify_instances(struct ucounts * ucounts)55 static inline void dec_inotify_instances(struct ucounts *ucounts)
56 {
57 	dec_ucount(ucounts, UCOUNT_INOTIFY_INSTANCES);
58 }
59 
inc_inotify_watches(struct ucounts * ucounts)60 static inline struct ucounts *inc_inotify_watches(struct ucounts *ucounts)
61 {
62 	return inc_ucount(ucounts->ns, ucounts->uid, UCOUNT_INOTIFY_WATCHES);
63 }
64 
dec_inotify_watches(struct ucounts * ucounts)65 static inline void dec_inotify_watches(struct ucounts *ucounts)
66 {
67 	dec_ucount(ucounts, UCOUNT_INOTIFY_WATCHES);
68 }
69 #endif
70