-extern int __must_check verify_io_u(struct thread_data *, struct io_u *);
-extern int verify_io_u_async(struct thread_data *, struct io_u *);
+extern int __must_check verify_io_u(struct thread_data *, struct io_u **);
+extern int verify_io_u_async(struct thread_data *, struct io_u **);
+extern void fill_verify_pattern(struct thread_data *td, void *p, unsigned int len, struct io_u *io_u, unsigned long seed, int use_seed);
+extern void fill_buffer_pattern(struct thread_data *td, void *p, unsigned int len);
+extern void fio_verify_init(struct thread_data *td);