1POSIX_FADV_NORMAL 0 2POSIX_FADV_RANDOM 1 3POSIX_FADV_SEQUENTIAL 2 4POSIX_FADV_WILLNEED 3 5#if defined __s390x__ 6POSIX_FADV_DONTNEED 6 7POSIX_FADV_NOREUSE 7 8#else 9POSIX_FADV_DONTNEED 4 10POSIX_FADV_NOREUSE 5 11#endif 12