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
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
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
55 static inline void dec_inotify_instances(struct ucounts *ucounts)
56 {
57 dec_ucount(ucounts, UCOUNT_INOTIFY_INSTANCES);
58 }
59
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
65 static inline void dec_inotify_watches(struct ucounts *ucounts)
66 {
67 dec_ucount(ucounts, UCOUNT_INOTIFY_WATCHES);
68 }
69 #endif
70
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