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 */ 18 struct 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_ONLYDIR 0x01000000 /* only watch the path if it is a directory */ 51 #define IN_DONT_FOLLOW 0x02000000 /* don't follow a sym link */ 52 #define IN_MASK_ADD 0x20000000 /* add to the mask of an already existing watch */ 53 #define IN_ISDIR 0x40000000 /* event occurred against dir */ 54 #define IN_ONESHOT 0x80000000 /* only send event once */ 55 56 /* 57 * All of the events - we build the list by hand so that we can add flags in 58 * the future and not break backward compatibility. Apps will get only the 59 * events that they originally wanted. Be sure to add new events here! 60 */ 61 #define IN_ALL_EVENTS (IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE | \ 62 IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM | \ 63 IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF | \ 64 IN_MOVE_SELF) 65 66 #ifdef __KERNEL__ 67 68 #include <linux/dcache.h> 69 #include <linux/fs.h> 70 #include <linux/config.h> 71 72 #ifdef CONFIG_INOTIFY 73 74 extern void inotify_inode_queue_event(struct inode *, __u32, __u32, 75 const char *); 76 extern void inotify_dentry_parent_queue_event(struct dentry *, __u32, __u32, 77 const char *); 78 extern void inotify_unmount_inodes(struct list_head *); 79 extern void inotify_inode_is_dead(struct inode *); 80 extern u32 inotify_get_cookie(void); 81 82 #else 83 84 static inline void inotify_inode_queue_event(struct inode *inode, 85 __u32 mask, __u32 cookie, 86 const char *filename) 87 { 88 } 89 90 static inline void inotify_dentry_parent_queue_event(struct dentry *dentry, 91 __u32 mask, __u32 cookie, 92 const char *filename) 93 { 94 } 95 96 static inline void inotify_unmount_inodes(struct list_head *list) 97 { 98 } 99 100 static inline void inotify_inode_is_dead(struct inode *inode) 101 { 102 } 103 104 static inline u32 inotify_get_cookie(void) 105 { 106 return 0; 107 } 108 109 #endif /* CONFIG_INOTIFY */ 110 111 #endif /* __KERNEL __ */ 112 113 #endif /* _LINUX_INOTIFY_H */ 114