extern void lock_file(struct thread_data *, struct fio_file *, enum fio_ddir);
extern void unlock_file(struct thread_data *, struct fio_file *);
extern void unlock_file_all(struct thread_data *, struct fio_file *);
extern void lock_file(struct thread_data *, struct fio_file *, enum fio_ddir);
extern void unlock_file(struct thread_data *, struct fio_file *);
extern void unlock_file_all(struct thread_data *, struct fio_file *);