/* * 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 */