1 files changed, 158 insertions, 0 deletions
diff --git a/src/mon/MDSMonitor.h b/src/mon/MDSMonitor.h
new file mode 100644
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+++ b/src/mon/MDSMonitor.h
@@ -0,0 +1,158 @@
+// -*- 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.
+ * 
+ */
+ 
+/* Metadata Server Monitor
+ */
+
+#ifndef CEPH_MDSMONITOR_H
+#define CEPH_MDSMONITOR_H
+
+#include <map>
+#include <set>
+
+#include "include/types.h"
+#include "PaxosFSMap.h"
+#include "PaxosService.h"
+#include "msg/Messenger.h"
+#include "messages/MMDSBeacon.h"
+#include "CommandHandler.h"
+
+class FileSystemCommandHandler;
+
+class MDSMonitor : public PaxosService, public PaxosFSMap, protected CommandHandler {
+ public:
+  using clock = ceph::coarse_mono_clock;
+  using time = ceph::coarse_mono_time;
+
+  MDSMonitor(Monitor &mn, Paxos &p, std::string service_name);
+
+  // service methods
+  void create_initial() override;
+  void get_store_prefixes(std::set<std::string>& s) const override;
+  void update_from_paxos(bool *need_bootstrap) override;
+  void init() override;
+  void create_pending() override;
+  void encode_pending(MonitorDBStore::TransactionRef t) override;
+  // we don't require full versions; don't encode any.
+  void encode_full(MonitorDBStore::TransactionRef t) override { }
+  version_t get_trim_to() const override;
+
+  bool preprocess_query(MonOpRequestRef op) override;  // true if processed.
+  bool prepare_update(MonOpRequestRef op) override;
+  bool should_propose(double& delay) override;
+
+  bool should_print_status() const {
+    auto& fs = get_fsmap();
+    auto fs_count = fs.filesystem_count();
+    auto standby_count = fs.get_num_standby();
+    return fs_count > 0 || standby_count > 0;
+  }
+
+  void on_active() override;
+  void on_restart() override;
+
+  void check_subs();
+  void check_sub(Subscription *sub);
+
+  void dump_info(ceph::Formatter *f);
+  int print_nodes(ceph::Formatter *f);
+
+  /**
+   * Return true if a blocklist was done (i.e. OSD propose needed)
+   */
+  bool fail_mds_gid(FSMap &fsmap, mds_gid_t gid);
+
+  bool is_leader() const override { return mon.is_leader(); }
+
+ protected:
+  using mds_info_t = MDSMap::mds_info_t;
+
+  // my helpers
+  template<int dblV = 7>
+  void print_map(const FSMap &m);
+
+  void _updated(MonOpRequestRef op);
+
+  void _note_beacon(class MMDSBeacon *m);
+  bool preprocess_beacon(MonOpRequestRef op);
+  bool prepare_beacon(MonOpRequestRef op);
+
+  bool preprocess_offload_targets(MonOpRequestRef op);
+  bool prepare_offload_targets(MonOpRequestRef op);
+
+  int fail_mds(FSMap &fsmap, std::ostream &ss,
+      const std::string &arg, mds_info_t *failed_info);
+
+  bool preprocess_command(MonOpRequestRef op);
+  bool prepare_command(MonOpRequestRef op);
+
+  int filesystem_command(
+      FSMap &fsmap,
+      MonOpRequestRef op,
+      std::string const &prefix,
+      const cmdmap_t& cmdmap,
+      std::stringstream &ss);
+
+  // beacons
+  struct beacon_info_t {
+    ceph::mono_time stamp = ceph::mono_clock::zero();
+    uint64_t seq = 0;
+    beacon_info_t() {}
+    beacon_info_t(ceph::mono_time stamp, uint64_t seq) : stamp(stamp), seq(seq) {}
+  };
+  std::map<mds_gid_t, beacon_info_t> last_beacon;
+
+  std::list<std::shared_ptr<FileSystemCommandHandler> > handlers;
+
+  bool maybe_promote_standby(FSMap& fsmap, Filesystem& fs);
+  bool maybe_resize_cluster(FSMap &fsmap, fs_cluster_id_t fscid);
+  bool drop_mds(FSMap &fsmap, mds_gid_t gid, const mds_info_t* rep_info, bool* osd_propose);
+  bool check_health(FSMap &fsmap, bool* osd_propose);
+  void tick() override;     // check state, take actions
+
+  int dump_metadata(const FSMap &fsmap, const std::string &who, ceph::Formatter *f,
+		    std::ostream& err);
+
+  void update_metadata(mds_gid_t gid, const Metadata& metadata);
+  void remove_from_metadata(const FSMap &fsmap, MonitorDBStore::TransactionRef t);
+  int load_metadata(std::map<mds_gid_t, Metadata>& m);
+  void count_metadata(const std::string& field, ceph::Formatter *f);
+
+public:
+  void print_fs_summary(ostream& out) {
+    get_fsmap().print_fs_summary(out);
+  }
+  void count_metadata(const std::string& field, std::map<std::string,int> *out);
+  void get_versions(std::map<std::string, std::list<std::string>> &versions);
+
+protected:
+  // MDS daemon GID to latest health state from that GID
+  std::map<uint64_t, MDSHealth> pending_daemon_health;
+  std::set<uint64_t> pending_daemon_health_rm;
+
+  std::map<mds_gid_t, Metadata> pending_metadata;
+
+  mds_gid_t gid_from_arg(const FSMap &fsmap, const std::string &arg, std::ostream& err);
+
+  // When did the mon last call into our tick() method?  Used for detecting
+  // when the mon was not updating us for some period (e.g. during slow
+  // election) to reset last_beacon timeouts
+  ceph::mono_time last_tick = ceph::mono_clock::zero();
+
+private:
+  time last_fsmap_struct_flush = clock::zero();
+  bool check_fsmap_struct_version = true;
+};
+
+#endif