extern bool __must_check get_next_trim(struct thread_data *td, struct io_u *io_u);
extern bool io_u_should_trim(struct thread_data *td, struct io_u *io_u);
extern bool __must_check get_next_trim(struct thread_data *td, struct io_u *io_u);
extern bool io_u_should_trim(struct thread_data *td, struct io_u *io_u);