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)
31
32static 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
44extern void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark,
45 struct fsnotify_group *group);
46extern 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
51extern const struct fsnotify_ops inotify_fsnotify_ops;
52extern struct kmem_cache *inotify_inode_mark_cachep;
53
54#ifdef CONFIG_INOTIFY_USER
55static inline void dec_inotify_instances(struct ucounts *ucounts)
56{
57 dec_ucount(ucounts, type: UCOUNT_INOTIFY_INSTANCES);
58}
59
60static inline struct ucounts *inc_inotify_watches(struct ucounts *ucounts)
61{
62 return inc_ucount(ns: ucounts->ns, uid: ucounts->uid, type: UCOUNT_INOTIFY_WATCHES);
63}
64
65static inline void dec_inotify_watches(struct ucounts *ucounts)
66{
67 dec_ucount(ucounts, type: UCOUNT_INOTIFY_WATCHES);
68}
69#endif
70