fsnotify: move events should indicate the event was on a child

fsnotify tells its listeners explicitly when an event happened on the given
inode verses on the child of the given inode.  (see __fsnotify_parent)
However, the semantics of fsnotify_move() are such that we deliver events
directly to the two parent directories in question (old_dir and new_dir)
directly without using the __fsnotify_parent() call.  fsnotify should be
adding FS_EVENT_ON_CHILD for the notifications to these parents.
Signed-off-by: NEric Paris <eparis@redhat.com>

include/linux/fsnotify.h

@@ -71,12 +71,11 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
 	struct inode *source = moved->d_inode;
 	u32 in_cookie = inotify_get_cookie();
 	u32 fs_cookie = fsnotify_get_cookie();
-	__u32 old_dir_mask = 0;
-	__u32 new_dir_mask = 0;
+	__u32 old_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_FROM);
+	__u32 new_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_TO);
 
-	if (old_dir == new_dir) {
-		old_dir_mask = FS_DN_RENAME;
-	}
+	if (old_dir == new_dir)
+		old_dir_mask |= FS_DN_RENAME;
 
 	if (isdir) {
 		isdir = IN_ISDIR;
@@ -84,9 +83,6 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
 		new_dir_mask |= FS_IN_ISDIR;
 	}
 
-	old_dir_mask |= FS_MOVED_FROM;
-	new_dir_mask |= FS_MOVED_TO;
-
 	inotify_inode_queue_event(old_dir, IN_MOVED_FROM|isdir, in_cookie, old_name,
 				  source);
 	inotify_inode_queue_event(new_dir, IN_MOVED_TO|isdir, in_cookie, new_name,