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/*

 * 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>

/*

 * struct inotify_watch - represents a watch request on a specific inode

 *

 * h_list is protected by ih->mutex of the associated inotify_handle.

 * i_list, mask are protected by inode->inotify_mutex of the associated inode.

 * ih, inode, and wd are never written to once the watch is created.

 *

 * Callers must use the established inotify interfaces to access inotify_watch

 * contents.  The content of this structure is private to the inotify

 * implementation.

 */

struct inotify_watch {

        struct list_head        h_list; /* entry in inotify_handle's list */

        struct list_head        i_list; /* entry in inode's list */

        atomic_t                count;  /* reference count */

        struct inotify_handle   *ih;    /* associated inotify handle */

        struct inode            *inode; /* associated inode */

        __s32                   wd;     /* watch descriptor */

        __u32                   mask;   /* event mask for this watch */

};

struct inotify_operations {

        void (*handle_event)(struct inotify_watch *, u32, u32, u32,

                             const char *, struct inode *);

        void (*destroy_watch)(struct inotify_watch *);

};

#ifdef CONFIG_INOTIFY

/* Kernel API for producing events */

extern void inotify_d_instantiate(struct dentry *, struct inode *);

extern void inotify_d_move(struct dentry *);

extern void inotify_inode_queue_event(struct inode *, __u32, __u32,

                                      const char *, struct inode *);

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);

/* Kernel Consumer API */

extern struct inotify_handle *inotify_init(const struct inotify_operations *);

extern void inotify_init_watch(struct inotify_watch *);

extern void inotify_destroy(struct inotify_handle *);

extern __s32 inotify_find_watch(struct inotify_handle *, struct inode *,

                                struct inotify_watch **);

extern __s32 inotify_find_update_watch(struct inotify_handle *, struct inode *,

                                       u32);

extern __s32 inotify_add_watch(struct inotify_handle *, struct inotify_watch *,

                               struct inode *, __u32);

extern __s32 inotify_clone_watch(struct inotify_watch *, struct inotify_watch *);

extern void inotify_evict_watch(struct inotify_watch *);

extern int inotify_rm_watch(struct inotify_handle *, struct inotify_watch *);

extern int inotify_rm_wd(struct inotify_handle *, __u32);

extern void inotify_remove_watch_locked(struct inotify_handle *,

                                        struct inotify_watch *);

extern void get_inotify_watch(struct inotify_watch *);

extern void put_inotify_watch(struct inotify_watch *);

#else

static inline void inotify_d_instantiate(struct dentry *dentry,

                                        struct inode *inode)

{

}

static inline void inotify_d_move(struct dentry *dentry)

{

}

static inline void inotify_inode_queue_event(struct inode *inode,

                                             __u32 mask, __u32 cookie,

                                             const char *filename,

                                             struct inode *n_inode)

{

}

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;

}

static inline struct inotify_handle *inotify_init(const struct inotify_operations *ops)

{

        return ERR_PTR(-EOPNOTSUPP);

}

static inline void inotify_init_watch(struct inotify_watch *watch)

{

}

static inline void inotify_destroy(struct inotify_handle *ih)

{

}

static inline __s32 inotify_find_watch(struct inotify_handle *ih, struct inode *inode,

                                       struct inotify_watch **watchp)

{

        return -EOPNOTSUPP;

}

static inline __s32 inotify_find_update_watch(struct inotify_handle *ih,

                                              struct inode *inode, u32 mask)

{

        return -EOPNOTSUPP;

}

static inline __s32 inotify_add_watch(struct inotify_handle *ih,

                                      struct inotify_watch *watch,

                                      struct inode *inode, __u32 mask)

{

        return -EOPNOTSUPP;

}

static inline int inotify_rm_watch(struct inotify_handle *ih,

                                   struct inotify_watch *watch)

{

        return -EOPNOTSUPP;

}

static inline int inotify_rm_wd(struct inotify_handle *ih, __u32 wd)

{

        return -EOPNOTSUPP;

}

static inline void inotify_remove_watch_locked(struct inotify_handle *ih,

                                               struct inotify_watch *watch)

{

}

static inline void get_inotify_watch(struct inotify_watch *watch)

{

}

static inline void put_inotify_watch(struct inotify_watch *watch)

{

}

#endif  /* CONFIG_INOTIFY */

#endif  /* __KERNEL __ */

#endif  /* _LINUX_INOTIFY_H */