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diff --git a/src/cls/cmpomap/types.h b/src/cls/cmpomap/types.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab ft=cpp
+
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2020 Red Hat, Inc
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include <string>
+#include <boost/container/flat_map.hpp>
+#include "include/rados.h" // CEPH_OSD_CMPXATTR_*
+#include "include/encoding.h"
+
+namespace cls::cmpomap {
+
+/// comparison operand type
+enum class Mode : uint8_t {
+  String = CEPH_OSD_CMPXATTR_MODE_STRING,
+  U64    = CEPH_OSD_CMPXATTR_MODE_U64,
+};
+
+/// comparison operation, where the left-hand operand is the input value and
+/// the right-hand operand is the stored value (or the optional default)
+enum class Op : uint8_t {
+  EQ  = CEPH_OSD_CMPXATTR_OP_EQ,
+  NE  = CEPH_OSD_CMPXATTR_OP_NE,
+  GT  = CEPH_OSD_CMPXATTR_OP_GT,
+  GTE = CEPH_OSD_CMPXATTR_OP_GTE,
+  LT  = CEPH_OSD_CMPXATTR_OP_LT,
+  LTE = CEPH_OSD_CMPXATTR_OP_LTE,
+};
+
+/// mapping of omap keys to value comparisons
+using ComparisonMap = boost::container::flat_map<std::string, ceph::bufferlist>;
+
+} // namespace cls::cmpomap