forked from mirrors/linux
8140a5005b
The below patch lets userspace have more control over the inodes that
inotify will watch. It introduces two new flags.
IN_ONLYDIR -- only watch the inode if it is a directory.
This is needed to avoid the race that can occur when we want to be
sure that we are watching a directory.
IN_DONT_FOLLOW -- don't follow a symlink. In combination
with IN_ONLYDIR we can make sure that we don't watch the target of
symlinks.
The issues the flags fix came up when writing the gnome-vfs inotify
backend. Default behaviour is unchanged.
Signed-off-by: John McCutchan <ttb@tentacle.dhs.org>
Acked-by: Robert Love <rml@novell.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
113 lines
3.6 KiB
C
113 lines
3.6 KiB
C
/*
|
|
* Inode based directory notification for Linux
|
|
*
|
|
* Copyright (C) 2005 John McCutchan
|
|
*/
|
|
|
|
#ifndef _LINUX_INOTIFY_H
|
|
#define _LINUX_INOTIFY_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
/*
|
|
* struct inotify_event - structure read from the inotify device for each event
|
|
*
|
|
* When you are watching a directory, you will receive the filename for events
|
|
* such as IN_CREATE, IN_DELETE, IN_OPEN, IN_CLOSE, ..., relative to the wd.
|
|
*/
|
|
struct inotify_event {
|
|
__s32 wd; /* watch descriptor */
|
|
__u32 mask; /* watch mask */
|
|
__u32 cookie; /* cookie to synchronize two events */
|
|
__u32 len; /* length (including nulls) of name */
|
|
char name[0]; /* stub for possible name */
|
|
};
|
|
|
|
/* the following are legal, implemented events that user-space can watch for */
|
|
#define IN_ACCESS 0x00000001 /* File was accessed */
|
|
#define IN_MODIFY 0x00000002 /* File was modified */
|
|
#define IN_ATTRIB 0x00000004 /* Metadata changed */
|
|
#define IN_CLOSE_WRITE 0x00000008 /* Writtable file was closed */
|
|
#define IN_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
|
|
#define IN_OPEN 0x00000020 /* File was opened */
|
|
#define IN_MOVED_FROM 0x00000040 /* File was moved from X */
|
|
#define IN_MOVED_TO 0x00000080 /* File was moved to Y */
|
|
#define IN_CREATE 0x00000100 /* Subfile was created */
|
|
#define IN_DELETE 0x00000200 /* Subfile was deleted */
|
|
#define IN_DELETE_SELF 0x00000400 /* Self was deleted */
|
|
#define IN_MOVE_SELF 0x00000800 /* Self was moved */
|
|
|
|
/* the following are legal events. they are sent as needed to any watch */
|
|
#define IN_UNMOUNT 0x00002000 /* Backing fs was unmounted */
|
|
#define IN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
|
|
#define IN_IGNORED 0x00008000 /* File was ignored */
|
|
|
|
/* helper events */
|
|
#define IN_CLOSE (IN_CLOSE_WRITE | IN_CLOSE_NOWRITE) /* close */
|
|
#define IN_MOVE (IN_MOVED_FROM | IN_MOVED_TO) /* moves */
|
|
|
|
/* special flags */
|
|
#define IN_ONLYDIR 0x01000000 /* only watch the path if it is a directory */
|
|
#define IN_DONT_FOLLOW 0x02000000 /* don't follow a sym link */
|
|
#define IN_MASK_ADD 0x20000000 /* add to the mask of an already existing watch */
|
|
#define IN_ISDIR 0x40000000 /* event occurred against dir */
|
|
#define IN_ONESHOT 0x80000000 /* only send event once */
|
|
|
|
/*
|
|
* All of the events - we build the list by hand so that we can add flags in
|
|
* the future and not break backward compatibility. Apps will get only the
|
|
* events that they originally wanted. Be sure to add new events here!
|
|
*/
|
|
#define IN_ALL_EVENTS (IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE | \
|
|
IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM | \
|
|
IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF | \
|
|
IN_MOVE_SELF)
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/dcache.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/config.h>
|
|
|
|
#ifdef CONFIG_INOTIFY
|
|
|
|
extern void inotify_inode_queue_event(struct inode *, __u32, __u32,
|
|
const char *);
|
|
extern void inotify_dentry_parent_queue_event(struct dentry *, __u32, __u32,
|
|
const char *);
|
|
extern void inotify_unmount_inodes(struct list_head *);
|
|
extern void inotify_inode_is_dead(struct inode *);
|
|
extern u32 inotify_get_cookie(void);
|
|
|
|
#else
|
|
|
|
static inline void inotify_inode_queue_event(struct inode *inode,
|
|
__u32 mask, __u32 cookie,
|
|
const char *filename)
|
|
{
|
|
}
|
|
|
|
static inline void inotify_dentry_parent_queue_event(struct dentry *dentry,
|
|
__u32 mask, __u32 cookie,
|
|
const char *filename)
|
|
{
|
|
}
|
|
|
|
static inline void inotify_unmount_inodes(struct list_head *list)
|
|
{
|
|
}
|
|
|
|
static inline void inotify_inode_is_dead(struct inode *inode)
|
|
{
|
|
}
|
|
|
|
static inline u32 inotify_get_cookie(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_INOTIFY */
|
|
|
|
#endif /* __KERNEL __ */
|
|
|
|
#endif /* _LINUX_INOTIFY_H */
|