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// @file dur_journal.h
* Copyright (C) 2010 10gen Inc.
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <>.
#pragma once
namespace mongo {
class AlignedBuilder;
namespace dur {
/** true if ok to cleanup journal files at termination. otherwise, files journal will be retained.
extern bool okToCleanUp;
/** at termination after db files closed & fsynced */
void journalCleanup();
/** assure journal/ dir exists. throws */
void journalMakeDir();
/** check if time to rotate files; assure a file is open.
done separately from the journal() call as we can do this part
outside of lock.
only called by durThread.
void journalRotate();
/** write/append to journal file *
@param buf - a buffer that will be written to the journal.
will not return until on disk
void journal(const AlignedBuilder& buf);
/** flag that something has gone wrong during writing to the journal
(not for recovery mode)
void journalingFailure(const char *msg);
/** read lsn from disk from the last run before doing recovery */
unsigned long long journalReadLSN();
unsigned long long getLastDataFileFlushTime();
/** never throws.
@return true if there are any journal files in the journal dir.
bool haveJournalFiles();
// in case disk controller buffers writes
const long long ExtraKeepTimeMs = 10000;
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