ret = fadvise(f->fd, off, len, POSIX_FADV_DONTNEED);
} else if (f->filetype == FIO_TYPE_BD) {
ret = blockdev_invalidate_cache(f->fd);
ret = fadvise(f->fd, off, len, POSIX_FADV_DONTNEED);
} else if (f->filetype == FIO_TYPE_BD) {
ret = blockdev_invalidate_cache(f->fd);