extern long __must_check io_u_sync_complete(struct thread_data *, struct io_u *, endio_handler *);
extern long __must_check io_u_queued_complete(struct thread_data *, int, endio_handler *);
extern void io_u_queued(struct thread_data *, struct io_u *);
extern long __must_check io_u_sync_complete(struct thread_data *, struct io_u *, endio_handler *);
extern long __must_check io_u_queued_complete(struct thread_data *, int, endio_handler *);
extern void io_u_queued(struct thread_data *, struct io_u *);