fanotify_encode_fh_len
fanotify_encode_fh(&ffe->object_fh, id, fanotify_encode_fh_len(id),
unsigned int dir_fh_len = fanotify_encode_fh_len(dir);
unsigned int dir2_fh_len = fanotify_encode_fh_len(dir2);
unsigned int child_fh_len = fanotify_encode_fh_len(child);
fh_len = fanotify_encode_fh_len(inode);