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
6struct 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
15struct inotify_inode_mark {
16	struct fsnotify_mark fsn_mark;
17	int wd;
18};
19
20static 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 | IN_ONESHOT | IN_EXCL_UNLINK)
31
32static inline __u32 inotify_mark_user_mask(struct fsnotify_mark *fsn_mark)
33{
34	return fsn_mark->mask & INOTIFY_USER_MASK;
35}
36
37extern void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark,
38					   struct fsnotify_group *group);
39extern int inotify_handle_inode_event(struct fsnotify_mark *inode_mark,
40				      u32 mask, struct inode *inode,
41				      struct inode *dir,
42				      const struct qstr *name, u32 cookie);
43
44extern const struct fsnotify_ops inotify_fsnotify_ops;
45extern struct kmem_cache *inotify_inode_mark_cachep;
46
47#ifdef CONFIG_INOTIFY_USER
48static inline void dec_inotify_instances(struct ucounts *ucounts)
49{
50	dec_ucount(ucounts, UCOUNT_INOTIFY_INSTANCES);
51}
52
53static inline struct ucounts *inc_inotify_watches(struct ucounts *ucounts)
54{
55	return inc_ucount(ucounts->ns, ucounts->uid, UCOUNT_INOTIFY_WATCHES);
56}
57
58static inline void dec_inotify_watches(struct ucounts *ucounts)
59{
60	dec_ucount(ucounts, UCOUNT_INOTIFY_WATCHES);
61}
62#endif
63