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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 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 */
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