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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 JOURNAL_POINTER_H
#define JOURNAL_POINTER_H
#include "include/encoding.h"
#include "mdstypes.h"
class Objecter;
// This always lives in the same location for a given MDS
// instance, it tells the daemon where to look for the journal.
class JournalPointer {
public:
JournalPointer(int node_id_, int64_t pool_id_) : node_id(node_id_), pool_id(pool_id_) {}
JournalPointer() {}
void encode(bufferlist &bl) const {
ENCODE_START(1, 1, bl);
encode(front, bl);
encode(back, bl);
ENCODE_FINISH(bl);
}
void decode(bufferlist::const_iterator &bl) {
DECODE_START(1, bl);
decode(front, bl);
decode(back, bl);
DECODE_FINISH(bl);
}
int load(Objecter *objecter);
int save(Objecter *objecter) const;
void save(Objecter *objecter, Context *completion) const;
bool is_null() const {
return front == 0 && back == 0;
}
void dump(Formatter *f) const {
f->open_object_section("journal_pointer");
{
f->dump_unsigned("front", front);
f->dump_unsigned("back", back);
}
f->close_section(); // journal_header
}
static void generate_test_instances(std::list<JournalPointer*> &ls)
{
ls.push_back(new JournalPointer());
ls.push_back(new JournalPointer());
ls.back()->front = 0xdeadbeef;
ls.back()->back = 0xfeedbead;
}
// The currently active journal
inodeno_t front = 0;
// The backup journal, if any (may be 0)
inodeno_t back = 0;
private:
// MDS rank
int node_id = -1;
// Metadata pool ID
int64_t pool_id = -1;
std::string get_object_id() const;
};
WRITE_CLASS_ENCODER(JournalPointer)
#endif // JOURNAL_POINTER_H
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