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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.
*
*/
#include "MDSTableServer.h"
#include "MDS.h"
#include "MDLog.h"
#include "msg/Messenger.h"
#include "messages/MMDSTableRequest.h"
#include "events/ETableServer.h"
#define dout_subsys ceph_subsys_mds
#undef dout_prefix
#define dout_prefix *_dout << "mds." << mds->get_nodeid() << ".tableserver(" << get_mdstable_name(table) << ") "
/* This function DOES put the passed message before returning */
void MDSTableServer::handle_request(MMDSTableRequest *req)
{
assert(req->op >= 0);
switch (req->op) {
case TABLESERVER_OP_QUERY: return handle_query(req);
case TABLESERVER_OP_PREPARE: return handle_prepare(req);
case TABLESERVER_OP_COMMIT: return handle_commit(req);
case TABLESERVER_OP_ROLLBACK: return handle_rollback(req);
default: assert(0);
}
}
// prepare
/* This function DOES put the passed message before returning */
void MDSTableServer::handle_prepare(MMDSTableRequest *req)
{
dout(7) << "handle_prepare " << *req << dendl;
int from = req->get_source().num();
bufferlist bl = req->bl;
_prepare(req->bl, req->reqid, from);
_note_prepare(from, req->reqid);
assert(g_conf->mds_kill_mdstable_at != 1);
ETableServer *le = new ETableServer(table, TABLESERVER_OP_PREPARE, req->reqid, from, version, version);
mds->mdlog->start_entry(le);
le->mutation = bl; // original request, NOT modified return value coming out of _prepare!
mds->mdlog->submit_entry(le, new C_Prepare(this, req, version));
mds->mdlog->flush();
}
void MDSTableServer::_prepare_logged(MMDSTableRequest *req, version_t tid)
{
dout(7) << "_create_logged " << *req << " tid " << tid << dendl;
assert(g_conf->mds_kill_mdstable_at != 2);
MMDSTableRequest *reply = new MMDSTableRequest(table, TABLESERVER_OP_AGREE, req->reqid, tid);
reply->bl = req->bl;
mds->send_message_mds(reply, req->get_source().num());
req->put();
}
// commit
/* This function DOES put the passed message before returning */
void MDSTableServer::handle_commit(MMDSTableRequest *req)
{
dout(7) << "handle_commit " << *req << dendl;
version_t tid = req->get_tid();
if (pending_for_mds.count(tid)) {
assert(g_conf->mds_kill_mdstable_at != 5);
_commit(tid);
_note_commit(tid);
mds->mdlog->start_submit_entry(new ETableServer(table, TABLESERVER_OP_COMMIT, 0, -1,
tid, version));
mds->mdlog->wait_for_safe(new C_Commit(this, req));
}
else if (tid <= version) {
dout(0) << "got commit for tid " << tid << " <= " << version
<< ", already committed, sending ack."
<< dendl;
_commit_logged(req);
}
else {
// wtf.
dout(0) << "got commit for tid " << tid << " > " << version << dendl;
assert(tid <= version);
}
}
/* This function DOES put the passed message before returning */
void MDSTableServer::_commit_logged(MMDSTableRequest *req)
{
dout(7) << "_commit_logged, sending ACK" << dendl;
assert(g_conf->mds_kill_mdstable_at != 6);
MMDSTableRequest *reply = new MMDSTableRequest(table, TABLESERVER_OP_ACK, req->reqid, req->get_tid());
mds->send_message_mds(reply, req->get_source().num());
req->put();
}
// ROLLBACK
/* This function DOES put the passed message before returning */
void MDSTableServer::handle_rollback(MMDSTableRequest *req)
{
dout(7) << "handle_rollback " << *req << dendl;
_rollback(req->get_tid());
_note_rollback(req->get_tid());
mds->mdlog->start_submit_entry(new ETableServer(table, TABLESERVER_OP_ROLLBACK, 0, -1,
req->get_tid(), version));
req->put();
}
// SERVER UPDATE
void MDSTableServer::do_server_update(bufferlist& bl)
{
dout(10) << "do_server_update len " << bl.length() << dendl;
_server_update(bl);
ETableServer *le = new ETableServer(table, TABLESERVER_OP_SERVER_UPDATE, 0, -1, 0, version);
mds->mdlog->start_entry(le);
le->mutation = bl;
mds->mdlog->submit_entry(le);
}
// recovery
void MDSTableServer::finish_recovery()
{
dout(7) << "finish_recovery" << dendl;
handle_mds_recovery(-1); // resend agrees for everyone.
}
void MDSTableServer::handle_mds_recovery(int who)
{
if (who >= 0)
dout(7) << "handle_mds_recovery mds." << who << dendl;
// resend agrees for recovered mds
for (map<version_t,_pending>::iterator p = pending_for_mds.begin();
p != pending_for_mds.end();
p++) {
if (who >= 0 && p->second.mds != who)
continue;
MMDSTableRequest *reply = new MMDSTableRequest(table, TABLESERVER_OP_AGREE, p->second.reqid, p->second.tid);
mds->send_message_mds(reply, p->second.mds);
}
}
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