extern void io_u_mark_depth(struct thread_data *, unsigned int);
extern void io_u_fill_buffer(struct thread_data *td, struct io_u *, unsigned int);
void io_u_mark_complete(struct thread_data *, unsigned int);
extern void io_u_mark_depth(struct thread_data *, unsigned int);
extern void io_u_fill_buffer(struct thread_data *td, struct io_u *, unsigned int);
void io_u_mark_complete(struct thread_data *, unsigned int);