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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_PAXOS_FSMAP_H
#define CEPH_PAXOS_FSMAP_H
#include "mds/FSMap.h"
#include "mds/MDSMap.h"
#include "include/ceph_assert.h"
class PaxosFSMap {
public:
virtual ~PaxosFSMap() {}
const FSMap &get_pending_fsmap() const { ceph_assert(is_leader()); return pending_fsmap; }
const FSMap &get_fsmap() const { return fsmap; }
virtual bool is_leader() const = 0;
protected:
FSMap &get_pending_fsmap_writeable() { ceph_assert(is_leader()); return pending_fsmap; }
FSMap &create_pending() {
ceph_assert(is_leader());
pending_fsmap = fsmap;
pending_fsmap.epoch++;
return pending_fsmap;
}
void decode(ceph::buffer::list &bl) {
fsmap.decode(bl);
pending_fsmap = FSMap(); /* nuke it to catch invalid access */
}
private:
/* Keep these PRIVATE to prevent unprotected manipulation. */
FSMap fsmap; /* the current epoch */
FSMap pending_fsmap; /* the next epoch */
};
#endif
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