#endif
#ifndef FIO_HAVE_ODIRECT
-#define OS_O_DIRECT (0)
+#define OS_O_DIRECT 0
+#else
+#define OS_O_DIRECT O_DIRECT
+#endif
+
+#ifndef FIO_HAVE_HUGETLB
+#define SHM_HUGETLB 0
+#define FIO_HUGE_PAGE 0
+#else
+#define FIO_HUGE_PAGE (4096 * 1024)
#endif
-struct thread_data;
-extern int fio_libaio_init(struct thread_data *);
-extern int fio_posixaio_init(struct thread_data *);
-extern int fio_syncio_init(struct thread_data *);
-extern int fio_mmapio_init(struct thread_data *);
-extern int fio_sgio_init(struct thread_data *);
-extern int fio_spliceio_init(struct thread_data *);
+#if __GNUC__ < 3
+#define __must_check
+#else
+#define __must_check __attribute__((warn_unused_result))
+#endif
#endif