--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2015 XSky <haomai@xsky.com>
+ *
+ * Author: Haomai Wang <haomaiwang@gmail.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#ifndef CEPH_COMMON_ALIGN_H
+#define CEPH_COMMON_ALIGN_H
+
+template <typename T>
+inline constexpr T align_up(T v, T align) {
+ return (v + align - 1) & ~(align - 1);
+}
+
+template <typename T>
+inline constexpr T align_down(T v, T align) {
+ return v & ~(align - 1);
+}
+
+#endif /* CEPH_COMMON_ALIGN_H */