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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_MDSTABLESERVER_H
#define CEPH_MDSTABLESERVER_H
#include "MDSTable.h"
#include "MDSContext.h"
#include "messages/MMDSTableRequest.h"
class MDSTableServer : public MDSTable {
protected:
int table;
bool recovered;
set<mds_rank_t> active_clients;
private:
map<version_t,mds_table_pending_t> pending_for_mds; // ** child should encode this! **
set<version_t> committing_tids;
struct notify_info_t {
set<mds_rank_t> notify_ack_gather;
mds_rank_t mds;
MMDSTableRequest::ref reply;
MDSContext *onfinish;
notify_info_t() : reply(NULL), onfinish(NULL) {}
};
map<version_t, notify_info_t> pending_notifies;
void handle_prepare(const MMDSTableRequest::const_ref &m);
void _prepare_logged(const MMDSTableRequest::const_ref &m, version_t tid);
friend class C_Prepare;
void handle_commit(const MMDSTableRequest::const_ref &m);
void _commit_logged(const MMDSTableRequest::const_ref &m);
friend class C_Commit;
void handle_rollback(const MMDSTableRequest::const_ref &m);
void _rollback_logged(const MMDSTableRequest::const_ref &m);
friend class C_Rollback;
void _server_update_logged(bufferlist& bl);
friend class C_ServerUpdate;
void handle_notify_ack(const MMDSTableRequest::const_ref &m);
public:
virtual void handle_query(const MMDSTableRequest::const_ref &m) = 0;
virtual void _prepare(const bufferlist &bl, uint64_t reqid, mds_rank_t bymds, bufferlist& out) = 0;
virtual void _get_reply_buffer(version_t tid, bufferlist *pbl) const = 0;
virtual void _commit(version_t tid, MMDSTableRequest::const_ref req) = 0;
virtual void _rollback(version_t tid) = 0;
virtual void _server_update(bufferlist& bl) { ceph_abort(); }
virtual bool _notify_prep(version_t tid) { return false; };
void _note_prepare(mds_rank_t mds, uint64_t reqid, bool replay=false) {
version++;
if (replay)
projected_version = version;
pending_for_mds[version].mds = mds;
pending_for_mds[version].reqid = reqid;
pending_for_mds[version].tid = version;
}
void _note_commit(uint64_t tid, bool replay=false) {
version++;
if (replay)
projected_version = version;
pending_for_mds.erase(tid);
}
void _note_rollback(uint64_t tid, bool replay=false) {
version++;
if (replay)
projected_version = version;
pending_for_mds.erase(tid);
}
void _note_server_update(bufferlist& bl, bool replay=false) {
version++;
if (replay)
projected_version = version;
}
MDSTableServer(MDSRank *m, int tab) :
MDSTable(m, get_mdstable_name(tab), false), table(tab), recovered(false) {}
~MDSTableServer() override {}
void reset_state() override {
pending_for_mds.clear();
++version;
}
void handle_request(const MMDSTableRequest::const_ref &m);
void do_server_update(bufferlist& bl);
virtual void encode_server_state(bufferlist& bl) const = 0;
virtual void decode_server_state(bufferlist::const_iterator& bl) = 0;
void encode_state(bufferlist& bl) const override {
encode_server_state(bl);
encode(pending_for_mds, bl);
}
void decode_state(bufferlist::const_iterator& bl) override {
decode_server_state(bl);
decode(pending_for_mds, bl);
}
// recovery
void finish_recovery(set<mds_rank_t>& active);
void _do_server_recovery();
friend class C_ServerRecovery;
void handle_mds_recovery(mds_rank_t who);
void handle_mds_failure_or_stop(mds_rank_t who);
};
#endif
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