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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"
#include "MDSContext.h"
class MDSRank;
class MDSTable {
public:
friend class C_IO_MT_Load;
friend class C_IO_MT_Save;
MDSTable(MDSRank *m, std::string_view n, bool is_per_mds) :
mds(m), table_name(n), per_mds(is_per_mds) {}
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(MDSContext *onfinish=0, version_t need=0);
void save_2(int r, version_t v);
void shutdown() {
if (is_active()) save(0);
}
object_t get_object_name() const;
void load(MDSContext *onfinish);
void load_2(int, bufferlist&, Context *onfinish);
// child must overload these
virtual void reset_state() = 0;
virtual void decode_state(bufferlist::const_iterator& p) = 0;
virtual void encode_state(bufferlist& bl) const = 0;
MDSRank *mds;
protected:
static const int STATE_UNDEF = 0;
static const int STATE_OPENING = 1;
static const int STATE_ACTIVE = 2;
//static const int STATE_COMMITTING = 3;
std::string table_name;
bool per_mds;
mds_rank_t rank = MDS_RANK_NONE;
int state = STATE_UNDEF;
version_t version = 0, committing_version = 0, committed_version = 0, projected_version = 0;
map<version_t, MDSContext::vec > waitfor_save;
};
#endif
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