- int (*fill_io_u_off)(struct thread_data *, struct io_u *);
- int (*fill_io_u_size)(struct thread_data *, struct io_u *);
+ int (*fill_io_u_off)(struct thread_data *, struct io_u *, unsigned int *);
+ int (*fill_io_u_size)(struct thread_data *, struct io_u *, unsigned int);