initial code repo

[stor4nfv.git] / src / ceph / src / mds / MDSTable.h

diff --git a/src/ceph/src/mds/MDSTable.h b/src/ceph/src/mds/MDSTable.h
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+++ b/src/ceph/src/mds/MDSTable.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_MDSTABLE_H
+#define CEPH_MDSTABLE_H
+
+#include "mdstypes.h"
+#include "mds_table_types.h"
+#include "include/buffer_fwd.h"
+
+class MDSRank;
+class Context;
+class MDSInternalContextBase;
+
+class MDSTable {
+public:
+  MDSRank *mds;
+protected:
+  const char *table_name;
+  bool per_mds;
+  mds_rank_t rank;
+
+  object_t get_object_name() const;
+  
+  static const int STATE_UNDEF   = 0;
+  static const int STATE_OPENING = 1;
+  static const int STATE_ACTIVE  = 2;
+  //static const int STATE_COMMITTING = 3;
+  int state;
+  
+  version_t version, committing_version, committed_version, projected_version;
+  
+  map<version_t, list<MDSInternalContextBase*> > waitfor_save;
+  
+public:
+  MDSTable(MDSRank *m, const char *n, bool is_per_mds) :
+    mds(m), table_name(n), per_mds(is_per_mds), rank(MDS_RANK_NONE),
+    state(STATE_UNDEF),
+    version(0), committing_version(0), committed_version(0), projected_version(0) {}
+  virtual ~MDSTable() {}
+
+  void set_rank(mds_rank_t r)
+  {
+    rank = r;
+  }
+
+  version_t get_version() const { return version; }
+  version_t get_committed_version() const { return committed_version; }
+  version_t get_committing_version() const { return committing_version; }
+  version_t get_projected_version() const { return projected_version; }
+  
+  void force_replay_version(version_t v) {
+    version = projected_version = v;
+  }
+
+  //version_t project_version() { return ++projected_version; }
+  //version_t inc_version() { return ++version; }
+
+  // load/save from disk (hack)
+  bool is_undef() const { return state == STATE_UNDEF; }
+  bool is_active() const { return state == STATE_ACTIVE; }
+  bool is_opening() const { return state == STATE_OPENING; }
+
+  void reset();
+  void save(MDSInternalContextBase *onfinish=0, version_t need=0);
+  void save_2(int r, version_t v);
+
+  void shutdown() {
+    if (is_active()) save(0);
+  }
+
+  void load(MDSInternalContextBase *onfinish);
+  void load_2(int, bufferlist&, Context *onfinish);
+
+  // child must overload these
+  virtual void reset_state() = 0;
+  virtual void decode_state(bufferlist::iterator& p) = 0;
+  virtual void encode_state(bufferlist& bl) const = 0;
+};
+
+#endif