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diff --git a/src/ceph/src/mds/FSMap.h b/src/ceph/src/mds/FSMap.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) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * 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_FSMAP_H
+#define CEPH_FSMAP_H
+
+#include <errno.h>
+
+#include "include/types.h"
+#include "common/Clock.h"
+#include "msg/Message.h"
+#include "mds/MDSMap.h"
+
+#include <set>
+#include <map>
+#include <string>
+
+#include "common/config.h"
+
+#include "include/CompatSet.h"
+#include "include/ceph_features.h"
+#include "common/Formatter.h"
+#include "mds/mdstypes.h"
+
+class CephContext;
+class health_check_map_t;
+
+#define MDS_FEATURE_INCOMPAT_BASE CompatSet::Feature(1, "base v0.20")
+#define MDS_FEATURE_INCOMPAT_CLIENTRANGES CompatSet::Feature(2, "client writeable ranges")
+#define MDS_FEATURE_INCOMPAT_FILELAYOUT CompatSet::Feature(3, "default file layouts on dirs")
+#define MDS_FEATURE_INCOMPAT_DIRINODE CompatSet::Feature(4, "dir inode in separate object")
+#define MDS_FEATURE_INCOMPAT_ENCODING CompatSet::Feature(5, "mds uses versioned encoding")
+#define MDS_FEATURE_INCOMPAT_OMAPDIRFRAG CompatSet::Feature(6, "dirfrag is stored in omap")
+#define MDS_FEATURE_INCOMPAT_INLINE CompatSet::Feature(7, "mds uses inline data")
+#define MDS_FEATURE_INCOMPAT_NOANCHOR CompatSet::Feature(8, "no anchor table")
+
+#define MDS_FS_NAME_DEFAULT "cephfs"
+
+/**
+ * The MDSMap and any additional fields describing a particular
+ * filesystem (a unique fs_cluster_id_t).
+ */
+class Filesystem
+{
+  public:
+  fs_cluster_id_t fscid;
+  MDSMap mds_map;
+
+  void encode(bufferlist& bl, uint64_t features) const;
+  void decode(bufferlist::iterator& p);
+
+  Filesystem()
+    :
+      fscid(FS_CLUSTER_ID_NONE)
+  {
+  }
+
+  void dump(Formatter *f) const;
+  void print(std::ostream& out) const;
+
+  /**
+   * Return true if a daemon is already assigned as
+   * STANDBY_REPLAY for the gid `who`
+   */
+  bool has_standby_replay(mds_gid_t who) const
+  {
+    for (const auto &i : mds_map.mds_info) {
+      const auto &info = i.second;
+      if (info.state == MDSMap::STATE_STANDBY_REPLAY
+          && info.rank == mds_map.mds_info.at(who).rank) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+};
+WRITE_CLASS_ENCODER_FEATURES(Filesystem)
+
+class FSMap {
+protected:
+  epoch_t epoch;
+  uint64_t next_filesystem_id;
+  fs_cluster_id_t legacy_client_fscid;
+  CompatSet compat;
+  bool enable_multiple;
+  bool ever_enabled_multiple; // < the cluster had multiple MDSes enabled once
+
+  std::map<fs_cluster_id_t, std::shared_ptr<Filesystem> > filesystems;
+
+  // Remember which Filesystem an MDS daemon's info is stored in
+  // (or in standby_daemons for FS_CLUSTER_ID_NONE)
+  std::map<mds_gid_t, fs_cluster_id_t> mds_roles;
+
+  // For MDS daemons not yet assigned to a Filesystem
+  std::map<mds_gid_t, MDSMap::mds_info_t> standby_daemons;
+  std::map<mds_gid_t, epoch_t> standby_epochs;
+
+public:
+
+  friend class MDSMonitor;
+
+  FSMap() 
+    : epoch(0),
+      next_filesystem_id(FS_CLUSTER_ID_ANONYMOUS + 1),
+      legacy_client_fscid(FS_CLUSTER_ID_NONE),
+      compat(get_mdsmap_compat_set_default()),
+      enable_multiple(false), ever_enabled_multiple(false)
+  { }
+
+  FSMap(const FSMap &rhs)
+    :
+      epoch(rhs.epoch),
+      next_filesystem_id(rhs.next_filesystem_id),
+      legacy_client_fscid(rhs.legacy_client_fscid),
+      compat(rhs.compat),
+      enable_multiple(rhs.enable_multiple),
+      ever_enabled_multiple(rhs.ever_enabled_multiple),
+      mds_roles(rhs.mds_roles),
+      standby_daemons(rhs.standby_daemons),
+      standby_epochs(rhs.standby_epochs)
+  {
+    for (const auto &i : rhs.filesystems) {
+      const auto &fs = i.second;
+      filesystems[fs->fscid] = std::make_shared<Filesystem>(*fs);
+    }
+  }
+
+  FSMap &operator=(const FSMap &rhs)
+  {
+    epoch = rhs.epoch;
+    next_filesystem_id = rhs.next_filesystem_id;
+    legacy_client_fscid = rhs.legacy_client_fscid;
+    compat = rhs.compat;
+    enable_multiple = rhs.enable_multiple;
+    mds_roles = rhs.mds_roles;
+    standby_daemons = rhs.standby_daemons;
+    standby_epochs = rhs.standby_epochs;
+
+    for (const auto &i : rhs.filesystems) {
+      const auto &fs = i.second;
+      filesystems[fs->fscid] = std::make_shared<Filesystem>(*fs);
+    }
+
+    return *this;
+  }
+
+  const CompatSet &get_compat() const {return compat;}
+
+  void set_enable_multiple(const bool v)
+  {
+    enable_multiple = v;
+    if (true == v) {
+      ever_enabled_multiple = true;
+    }
+  }
+
+  bool get_enable_multiple() const
+  {
+    return enable_multiple;
+  }
+
+  void set_legacy_client_fscid(fs_cluster_id_t fscid)
+  {
+    assert(fscid == FS_CLUSTER_ID_NONE || filesystems.count(fscid));
+    legacy_client_fscid = fscid;
+  }
+
+  fs_cluster_id_t get_legacy_client_fscid() const
+  {
+    return legacy_client_fscid;
+  }
+
+  /**
+   * Get state of all daemons (for all filesystems, including all standbys)
+   */
+  std::map<mds_gid_t, MDSMap::mds_info_t> get_mds_info() const
+  {
+    std::map<mds_gid_t, MDSMap::mds_info_t> result;
+    for (const auto &i : standby_daemons) {
+      result[i.first] = i.second;
+    }
+
+    for (const auto &i : filesystems) {
+      const auto &fs_info = i.second->mds_map.get_mds_info();
+      for (const auto &j : fs_info) {
+        result[j.first] = j.second;
+      }
+    }
+
+    return result;
+  }
+
+  /**
+   * Resolve daemon name to GID
+   */
+  mds_gid_t find_mds_gid_by_name(const std::string& s) const
+  {
+    const auto info = get_mds_info();
+    for (const auto &p : info) {
+      if (p.second.name == s) {
+	return p.first;
+      }
+    }
+    return MDS_GID_NONE;
+  }
+
+  /**
+   * Resolve daemon name to status
+   */
+  const MDSMap::mds_info_t* find_by_name(const std::string& name) const
+  {
+    std::map<mds_gid_t, MDSMap::mds_info_t> result;
+    for (const auto &i : standby_daemons) {
+      if (i.second.name == name) {
+        return &(i.second);
+      }
+    }
+
+    for (const auto &i : filesystems) {
+      const auto &fs_info = i.second->mds_map.get_mds_info();
+      for (const auto &j : fs_info) {
+        if (j.second.name == name) {
+          return &(j.second);
+        }
+      }
+    }
+
+    return nullptr;
+  }
+
+  /**
+   * Does a daemon exist with this GID?
+   */
+  bool gid_exists(mds_gid_t gid) const
+  {
+    return mds_roles.count(gid) > 0;
+  }
+
+  /**
+   * Does a daemon with this GID exist, *and* have an MDS rank assigned?
+   */
+  bool gid_has_rank(mds_gid_t gid) const
+  {
+    return gid_exists(gid) && mds_roles.at(gid) != FS_CLUSTER_ID_NONE;
+  }
+
+  /**
+   * Insert a new MDS daemon, as a standby
+   */
+  void insert(const MDSMap::mds_info_t &new_info);
+
+  /**
+   * Assign an MDS cluster standby replay rank to a standby daemon
+   */
+  void assign_standby_replay(
+      const mds_gid_t standby_gid,
+      const fs_cluster_id_t leader_ns,
+      const mds_rank_t leader_rank);
+
+  /**
+   * Assign an MDS cluster rank to a standby daemon
+   */
+  void promote(
+      mds_gid_t standby_gid,
+      const std::shared_ptr<Filesystem> &filesystem,
+      mds_rank_t assigned_rank);
+
+  /**
+   * A daemon reports that it is STATE_STOPPED: remove it,
+   * and the rank it held.
+   *
+   * @returns a list of any additional GIDs that were removed from the map
+   * as a side effect (like standby replays)
+   */
+  std::list<mds_gid_t> stop(mds_gid_t who);
+
+  /**
+   * The rank held by 'who', if any, is to be relinquished, and
+   * the state for the daemon GID is to be forgotten.
+   */
+  void erase(mds_gid_t who, epoch_t blacklist_epoch);
+
+  /**
+   * Update to indicate that the rank held by 'who' is damaged
+   */
+  void damaged(mds_gid_t who, epoch_t blacklist_epoch);
+
+  /**
+   * Update to indicate that the rank `rank` is to be removed
+   * from the damaged list of the filesystem `fscid`
+   */
+  bool undamaged(const fs_cluster_id_t fscid, const mds_rank_t rank);
+
+  /**
+   * Initialize a Filesystem and assign a fscid.  Update legacy_client_fscid
+   * to point to the new filesystem if it's the only one.
+   *
+   * Caller must already have validated all arguments vs. the existing
+   * FSMap and OSDMap contents.
+   */
+  void create_filesystem(const std::string &name,
+                         int64_t metadata_pool, int64_t data_pool,
+                         uint64_t features);
+
+  /**
+   * Remove the filesystem (it must exist).  Caller should already
+   * have failed out any MDSs that were assigned to the filesystem.
+   */
+  void erase_filesystem(fs_cluster_id_t fscid)
+  {
+    filesystems.erase(fscid);
+  }
+
+  /**
+   * Reset all the state information (not configuration information)
+   * in a particular filesystem.  Caller must have verified that
+   * the filesystem already exists.
+   */
+  void reset_filesystem(fs_cluster_id_t fscid);
+
+  /**
+   * Mutator helper for Filesystem objects: expose a non-const
+   * Filesystem pointer to `fn` and update epochs appropriately.
+   */
+  void modify_filesystem(
+      const fs_cluster_id_t fscid,
+      std::function<void(std::shared_ptr<Filesystem> )> fn)
+  {
+    auto fs = filesystems.at(fscid);
+    fn(fs);
+    fs->mds_map.epoch = epoch;
+  }
+
+  /**
+   * Apply a mutation to the mds_info_t structure for a particular
+   * daemon (identified by GID), and make appropriate updates to epochs.
+   */
+  void modify_daemon(
+      mds_gid_t who,
+      std::function<void(MDSMap::mds_info_t *info)> fn)
+  {
+    if (mds_roles.at(who) == FS_CLUSTER_ID_NONE) {
+      auto &info = standby_daemons.at(who);
+      fn(&info);
+      assert(info.state == MDSMap::STATE_STANDBY);
+      standby_epochs[who] = epoch;
+    } else {
+      const auto &fs = filesystems[mds_roles.at(who)];
+      auto &info = fs->mds_map.mds_info.at(who);
+      fn(&info);
+
+      fs->mds_map.epoch = epoch;
+    }
+  }
+
+  /**
+   * Given that gid exists in a filesystem or as a standby, return
+   * a reference to its info.
+   */
+  const MDSMap::mds_info_t& get_info_gid(mds_gid_t gid) const
+  {
+    auto fscid = mds_roles.at(gid);
+    if (fscid == FS_CLUSTER_ID_NONE) {
+      return standby_daemons.at(gid);
+    } else {
+      return filesystems.at(fscid)->mds_map.mds_info.at(gid);
+    }
+  }
+
+  /**
+   * A daemon has told us it's compat, and it's too new
+   * for the one we had previously.  Impose the new one
+   * on all filesystems.
+   */
+  void update_compat(const CompatSet &c)
+  {
+    // We could do something more complicated here to enable
+    // different filesystems to be served by different MDS versions,
+    // but this is a lot simpler because it doesn't require us to
+    // track the compat versions for standby daemons.
+    compat = c;
+    for (const auto &i : filesystems) {
+      MDSMap &mds_map = i.second->mds_map;
+      mds_map.compat = c;
+      mds_map.epoch = epoch;
+    }
+  }
+
+  std::shared_ptr<const Filesystem> get_legacy_filesystem()
+  {
+    if (legacy_client_fscid == FS_CLUSTER_ID_NONE) {
+      return nullptr;
+    } else {
+      return filesystems.at(legacy_client_fscid);
+    }
+  }
+
+  /**
+   * A daemon has informed us of its offload targets
+   */
+  void update_export_targets(mds_gid_t who, const std::set<mds_rank_t> targets)
+  {
+    auto fscid = mds_roles.at(who);
+    modify_filesystem(fscid, [who, &targets](std::shared_ptr<Filesystem> fs) {
+      fs->mds_map.mds_info.at(who).export_targets = targets;
+    });
+  }
+
+  epoch_t get_epoch() const { return epoch; }
+  void inc_epoch() { epoch++; }
+
+  size_t filesystem_count() const {return filesystems.size();}
+  bool filesystem_exists(fs_cluster_id_t fscid) const {return filesystems.count(fscid) > 0;}
+  std::shared_ptr<const Filesystem> get_filesystem(fs_cluster_id_t fscid) const {return std::const_pointer_cast<const Filesystem>(filesystems.at(fscid));}
+  std::shared_ptr<const Filesystem> get_filesystem(void) const {return std::const_pointer_cast<const Filesystem>(filesystems.begin()->second);}
+  std::shared_ptr<const Filesystem> get_filesystem(const std::string &name) const
+  {
+    for (const auto &i : filesystems) {
+      if (i.second->mds_map.fs_name == name) {
+        return std::const_pointer_cast<const Filesystem>(i.second);
+      }
+    }
+    return nullptr;
+  }
+  std::list<std::shared_ptr<const Filesystem> > get_filesystems(void) const
+    {
+      std::list<std::shared_ptr<const Filesystem> > ret;
+      for (const auto &i : filesystems) {
+	ret.push_back(std::const_pointer_cast<const Filesystem>(i.second));
+      }
+      return ret;
+    }
+
+  int parse_filesystem(
+      std::string const &ns_str,
+      std::shared_ptr<const Filesystem> *result
+      ) const;
+
+  int parse_role(
+      const std::string &role_str,
+      mds_role_t *role,
+      std::ostream &ss) const;
+
+  /**
+   * Return true if this pool is in use by any of the filesystems
+   */
+  bool pool_in_use(int64_t poolid) const {
+    for (auto const &i : filesystems) {
+      if (i.second->mds_map.is_data_pool(poolid)
+          || i.second->mds_map.metadata_pool == poolid) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  mds_gid_t find_standby_for(mds_role_t mds, const std::string& name) const;
+
+  mds_gid_t find_unused_for(mds_role_t mds, bool force_standby_active) const;
+
+  mds_gid_t find_replacement_for(mds_role_t mds, const std::string& name,
+                                 bool force_standby_active) const;
+
+  void get_health(list<pair<health_status_t,std::string> >& summary,
+		  list<pair<health_status_t,std::string> > *detail) const;
+
+  void get_health_checks(health_check_map_t *checks) const;
+
+  bool check_health(void);
+
+  /**
+   * Assert that the FSMap, Filesystem, MDSMap, mds_info_t relations are
+   * all self-consistent.
+   */
+  void sanity() const;
+
+  void encode(bufferlist& bl, uint64_t features) const;
+  void decode(bufferlist::iterator& p);
+  void decode(bufferlist& bl) {
+    bufferlist::iterator p = bl.begin();
+    decode(p);
+  }
+  void sanitize(std::function<bool(int64_t pool)> pool_exists);
+
+  void print(ostream& out) const;
+  void print_summary(Formatter *f, ostream *out) const;
+
+  void dump(Formatter *f) const;
+  static void generate_test_instances(list<FSMap*>& ls);
+};
+WRITE_CLASS_ENCODER_FEATURES(FSMap)
+
+inline ostream& operator<<(ostream& out, const FSMap& m) {
+  m.print_summary(NULL, &out);
+  return out;
+}
+
+#endif