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1/*
2 * Inode based directory notification for Linux
3 *
4 * Copyright (C) 2005 John McCutchan
5 */
6
7#ifndef _LINUX_INOTIFY_H
8#define _LINUX_INOTIFY_H
9
10#include <linux/types.h>
11
12/*
13 * struct inotify_event - structure read from the inotify device for each event
14 *
15 * When you are watching a directory, you will receive the filename for events
16 * such as IN_CREATE, IN_DELETE, IN_OPEN, IN_CLOSE, ..., relative to the wd.
17 */
18struct inotify_event {
19 __s32 wd; /* watch descriptor */
20 __u32 mask; /* watch mask */
21 __u32 cookie; /* cookie to synchronize two events */
22 __u32 len; /* length (including nulls) of name */
23 char name[0]; /* stub for possible name */
24};
25
26/* the following are legal, implemented events that user-space can watch for */
27#define IN_ACCESS 0x00000001 /* File was accessed */
28#define IN_MODIFY 0x00000002 /* File was modified */
29#define IN_ATTRIB 0x00000004 /* Metadata changed */
30#define IN_CLOSE_WRITE 0x00000008 /* Writtable file was closed */
31#define IN_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
32#define IN_OPEN 0x00000020 /* File was opened */
33#define IN_MOVED_FROM 0x00000040 /* File was moved from X */
34#define IN_MOVED_TO 0x00000080 /* File was moved to Y */
35#define IN_CREATE 0x00000100 /* Subfile was created */
36#define IN_DELETE 0x00000200 /* Subfile was deleted */
37#define IN_DELETE_SELF 0x00000400 /* Self was deleted */
38#define IN_MOVE_SELF 0x00000800 /* Self was moved */
39
40/* the following are legal events. they are sent as needed to any watch */
41#define IN_UNMOUNT 0x00002000 /* Backing fs was unmounted */
42#define IN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
43#define IN_IGNORED 0x00008000 /* File was ignored */
44
45/* helper events */
46#define IN_CLOSE (IN_CLOSE_WRITE | IN_CLOSE_NOWRITE) /* close */
47#define IN_MOVE (IN_MOVED_FROM | IN_MOVED_TO) /* moves */
48
49/* special flags */
50#define IN_ISDIR 0x40000000 /* event occurred against dir */
51#define IN_ONESHOT 0x80000000 /* only send event once */
52
53/*
54 * All of the events - we build the list by hand so that we can add flags in
55 * the future and not break backward compatibility. Apps will get only the
56 * events that they originally wanted. Be sure to add new events here!
57 */
58#define IN_ALL_EVENTS (IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE | \
59 IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM | \
60 IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF | \
61 IN_MOVE_SELF)
62
63#ifdef __KERNEL__
64
65#include <linux/dcache.h>
66#include <linux/fs.h>
67#include <linux/config.h>
68
69#ifdef CONFIG_INOTIFY
70
71extern void inotify_inode_queue_event(struct inode *, __u32, __u32,
72 const char *);
73extern void inotify_dentry_parent_queue_event(struct dentry *, __u32, __u32,
74 const char *);
75extern void inotify_unmount_inodes(struct list_head *);
76extern void inotify_inode_is_dead(struct inode *);
77extern u32 inotify_get_cookie(void);
78
79#else
80
81static inline void inotify_inode_queue_event(struct inode *inode,
82 __u32 mask, __u32 cookie,
83 const char *filename)
84{
85}
86
87static inline void inotify_dentry_parent_queue_event(struct dentry *dentry,
88 __u32 mask, __u32 cookie,
89 const char *filename)
90{
91}
92
93static inline void inotify_unmount_inodes(struct list_head *list)
94{
95}
96
97static inline void inotify_inode_is_dead(struct inode *inode)
98{
99}
100
101static inline u32 inotify_get_cookie(void)
102{
103 return 0;
104}
105
106#endif /* CONFIG_INOTIFY */
107
108#endif /* __KERNEL __ */
109
110#endif /* _LINUX_INOTIFY_H */