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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_MDSTABLECLIENT_H
#define CEPH_MDSTABLECLIENT_H
#include "include/types.h"
#include "MDSContext.h"
#include "mds_table_types.h"
#include "messages/MMDSTableRequest.h"
class MDSRank;
class LogSegment;
class MDSTableClient {
protected:
MDSRank *mds;
int table;
uint64_t last_reqid;
bool server_ready;
// prepares
struct _pending_prepare {
MDSContext *onfinish;
version_t *ptid;
bufferlist *pbl;
bufferlist mutation;
_pending_prepare() : onfinish(0), ptid(0), pbl(0) {}
_pending_prepare(MDSContext *c, version_t *pt, bufferlist *pb, bufferlist& m) :
onfinish(c), ptid(pt), pbl(pb), mutation(m) {}
};
map<uint64_t, _pending_prepare> pending_prepare;
map<version_t, uint64_t> prepared_update;
list<_pending_prepare> waiting_for_reqid;
// pending commits
map<version_t, LogSegment*> pending_commit;
map<version_t, MDSContext::vec > ack_waiters;
void handle_reply(class MMDSTableQuery *m);
void _logged_ack(version_t tid);
friend class C_LoggedAck;
public:
MDSTableClient(MDSRank *m, int tab) :
mds(m), table(tab), last_reqid(~0ULL), server_ready(false) {}
virtual ~MDSTableClient() {}
void handle_request(const MMDSTableRequest::const_ref &m);
void _prepare(bufferlist& mutation, version_t *ptid, bufferlist *pbl, MDSContext *onfinish);
void commit(version_t tid, LogSegment *ls);
void resend_commits();
void resend_prepares();
// for recovery (by me)
void got_journaled_agree(version_t tid, LogSegment *ls);
void got_journaled_ack(version_t tid);
bool has_committed(version_t tid) const {
return pending_commit.count(tid) == 0;
}
void wait_for_ack(version_t tid, MDSContext *c) {
ack_waiters[tid].push_back(c);
}
set<version_t> get_journaled_tids() const {
set<version_t> tids;
for (auto p : pending_commit)
tids.insert(p.first);
return tids;
}
void handle_mds_failure(mds_rank_t mds);
// child must implement
virtual void resend_queries() = 0;
virtual void handle_query_result(const MMDSTableRequest::const_ref &m) = 0;
virtual void handle_notify_prep(const MMDSTableRequest::const_ref &m) = 0;
virtual void notify_commit(version_t tid) = 0;
// and friendly front-end for _prepare.
};
#endif
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