+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);
+
+/*
+ * Async verify offload
+ */
+extern int verify_async_init(struct thread_data *);
+extern void verify_async_exit(struct thread_data *);