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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) 2010 Greg Farnum <gregf@hq.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 "mds/Resetter.h"
#include "osdc/Journaler.h"
#include "mds/mdstypes.h"
#include "mon/MonClient.h"
#include "mds/events/EResetJournal.h"
Resetter::~Resetter()
{
}
bool Resetter::ms_get_authorizer(int dest_type, AuthAuthorizer **authorizer,
bool force_new)
{
if (dest_type == CEPH_ENTITY_TYPE_MON)
return true;
if (force_new) {
if (monc->wait_auth_rotating(10) < 0)
return false;
}
*authorizer = monc->auth->build_authorizer(dest_type);
return *authorizer != NULL;
}
bool Resetter::ms_dispatch(Message *m)
{
Mutex::Locker l(lock);
switch (m->get_type()) {
case CEPH_MSG_OSD_OPREPLY:
objecter->handle_osd_op_reply((MOSDOpReply *)m);
break;
case CEPH_MSG_OSD_MAP:
objecter->handle_osd_map((MOSDMap*)m);
break;
default:
return false;
}
return true;
}
void Resetter::init(int rank)
{
inodeno_t ino = MDS_INO_LOG_OFFSET + rank;
unsigned pg_pool = CEPH_METADATA_RULE;
osdmap = new OSDMap();
objecter = new Objecter(g_ceph_context, messenger, monc, osdmap, lock, timer);
journaler = new Journaler(ino, pg_pool, CEPH_FS_ONDISK_MAGIC,
objecter, 0, 0, &timer);
objecter->set_client_incarnation(0);
messenger->add_dispatcher_head(this);
messenger->start_with_nonce(getpid());
monc->set_want_keys(CEPH_ENTITY_TYPE_MON|CEPH_ENTITY_TYPE_OSD|CEPH_ENTITY_TYPE_MDS);
monc->set_messenger(messenger);
monc->init();
monc->authenticate();
client_t whoami = monc->get_global_id();
messenger->set_myname(entity_name_t::CLIENT(whoami.v));
lock.Lock();
objecter->init();
objecter->wait_for_osd_map();
timer.init();
lock.Unlock();
}
void Resetter::shutdown()
{
lock.Lock();
timer.shutdown();
lock.Unlock();
messenger->shutdown();
messenger->wait();
}
void Resetter::reset()
{
Mutex mylock("Resetter::reset::lock");
Cond cond;
bool done;
int r;
lock.Lock();
journaler->recover(new C_SafeCond(&mylock, &cond, &done, &r));
lock.Unlock();
mylock.Lock();
while (!done)
cond.Wait(mylock);
mylock.Unlock();
if (r != 0) {
if (r == -ENOENT) {
cerr << "journal does not exist on-disk. Did you set a bad rank?"
<< std::endl;
shutdown();
return;
} else {
cerr << "got error " << r << "from Journaler, failling" << std::endl;
shutdown();
return;
}
}
lock.Lock();
uint64_t old_start = journaler->get_read_pos();
uint64_t old_end = journaler->get_write_pos();
uint64_t old_len = old_end - old_start;
cout << "old journal was " << old_start << "~" << old_len << std::endl;
uint64_t new_start = ROUND_UP_TO(old_end+1, journaler->get_layout_period());
cout << "new journal start will be " << new_start
<< " (" << (new_start - old_end) << " bytes past old end)" << std::endl;
journaler->set_read_pos(new_start);
journaler->set_write_pos(new_start);
journaler->set_expire_pos(new_start);
journaler->set_trimmed_pos(new_start);
journaler->set_writeable();
cout << "writing journal head" << std::endl;
journaler->write_head(new C_SafeCond(&mylock, &cond, &done, &r));
lock.Unlock();
mylock.Lock();
while (!done)
cond.Wait(mylock);
mylock.Unlock();
lock.Lock();
assert(r == 0);
LogEvent *le = new EResetJournal;
bufferlist bl;
le->encode_with_header(bl);
cout << "writing EResetJournal entry" << std::endl;
journaler->append_entry(bl);
journaler->flush(new C_SafeCond(&mylock, &cond, &done,&r));
lock.Unlock();
mylock.Lock();
while (!done)
cond.Wait(mylock);
mylock.Unlock();
assert(r == 0);
cout << "done" << std::endl;
shutdown();
}
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