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diff --git a/src/ceph/src/mgr/DaemonState.h b/src/ceph/src/mgr/DaemonState.h
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+// -*- 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) 2016 John Spray <john.spray@redhat.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 DAEMON_STATE_H_
+#define DAEMON_STATE_H_
+
+#include <map>
+#include <string>
+#include <memory>
+#include <set>
+#include <boost/circular_buffer.hpp>
+
+#include "common/RWLock.h"
+
+#include "msg/msg_types.h"
+
+// For PerfCounterType
+#include "messages/MMgrReport.h"
+
+
+// Unique reference to a daemon within a cluster
+typedef std::pair<std::string, std::string> DaemonKey;
+
+// An instance of a performance counter type, within
+// a particular daemon.
+class PerfCounterInstance
+{
+  class DataPoint
+  {
+    public:
+    utime_t t;
+    uint64_t v;
+    DataPoint(utime_t t_, uint64_t v_)
+      : t(t_), v(v_)
+    {}
+  };
+
+  boost::circular_buffer<DataPoint> buffer;
+  uint64_t get_current() const;
+
+  public:
+  const boost::circular_buffer<DataPoint> & get_data() const
+  {
+    return buffer;
+  }
+  void push(utime_t t, uint64_t const &v);
+  PerfCounterInstance()
+    : buffer(20) {}
+};
+
+
+typedef std::map<std::string, PerfCounterType> PerfCounterTypes;
+
+// Performance counters for one daemon
+class DaemonPerfCounters
+{
+  public:
+  // The record of perf stat types, shared between daemons
+  PerfCounterTypes &types;
+
+  DaemonPerfCounters(PerfCounterTypes &types_)
+    : types(types_)
+  {}
+
+  std::map<std::string, PerfCounterInstance> instances;
+
+  void update(MMgrReport *report);
+
+  void clear()
+  {
+    instances.clear();
+  }
+};
+
+// The state that we store about one daemon
+class DaemonState
+{
+  public:
+  Mutex lock = {"DaemonState::lock"};
+
+  DaemonKey key;
+
+  // The hostname where daemon was last seen running (extracted
+  // from the metadata)
+  std::string hostname;
+
+  // The metadata (hostname, version, etc) sent from the daemon
+  std::map<std::string, std::string> metadata;
+
+  // Ephemeral state
+  bool service_daemon = false;
+  utime_t service_status_stamp;
+  std::map<std::string, std::string> service_status;
+  utime_t last_service_beacon;
+
+  // The perf counters received in MMgrReport messages
+  DaemonPerfCounters perf_counters;
+
+  DaemonState(PerfCounterTypes &types_)
+    : perf_counters(types_)
+  {
+  }
+};
+
+typedef std::shared_ptr<DaemonState> DaemonStatePtr;
+typedef std::map<DaemonKey, DaemonStatePtr> DaemonStateCollection;
+
+
+
+
+/**
+ * Fuse the collection of per-daemon metadata from Ceph into
+ * a view that can be queried by service type, ID or also
+ * by server (aka fqdn).
+ */
+class DaemonStateIndex
+{
+  private:
+  mutable RWLock lock = {"DaemonStateIndex", true, true, true};
+
+  std::map<std::string, DaemonStateCollection> by_server;
+  DaemonStateCollection all;
+  std::set<DaemonKey> updating;
+
+  void _erase(const DaemonKey& dmk);
+
+  public:
+  DaemonStateIndex() {}
+
+  // FIXME: shouldn't really be public, maybe construct DaemonState
+  // objects internally to avoid this.
+  PerfCounterTypes types;
+
+  void insert(DaemonStatePtr dm);
+  bool exists(const DaemonKey &key) const;
+  DaemonStatePtr get(const DaemonKey &key);
+
+  // Note that these return by value rather than reference to avoid
+  // callers needing to stay in lock while using result.  Callers must
+  // still take the individual DaemonState::lock on each entry though.
+  DaemonStateCollection get_by_server(const std::string &hostname) const;
+  DaemonStateCollection get_by_service(const std::string &svc_name) const;
+  DaemonStateCollection get_all() const {return all;}
+
+  template<typename Callback, typename...Args>
+  auto with_daemons_by_server(Callback&& cb, Args&&... args) const ->
+    decltype(cb(by_server, std::forward<Args>(args)...)) {
+    RWLock::RLocker l(lock);
+    
+    return std::forward<Callback>(cb)(by_server, std::forward<Args>(args)...);
+  }
+
+  void notify_updating(const DaemonKey &k) {
+    RWLock::WLocker l(lock);
+    updating.insert(k);
+  }
+  void clear_updating(const DaemonKey &k) {
+    RWLock::WLocker l(lock);
+    updating.erase(k);
+  }
+  bool is_updating(const DaemonKey &k) {
+    RWLock::RLocker l(lock);
+    return updating.count(k) > 0;
+  }
+
+  /**
+   * Remove state for all daemons of this type whose names are
+   * not present in `names_exist`.  Use this function when you have
+   * a cluster map and want to ensure that anything absent in the map
+   * is also absent in this class.
+   */
+  void cull(const std::string& svc_name,
+	    const std::set<std::string>& names_exist);
+};
+
+#endif
+