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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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* 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 <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
namespace mongo {
class AlignedBuilder;
class JSectHeader;
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
also after recovery
closes and removes journal files
@param log report in log that we are cleaning up if we actually do any work
*/
void journalCleanup(bool log = false);
/** 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();
/** 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.
@param anyFiles by default we only look at j._* files. If anyFiles is true, return true
if there are any files in the journal directory. acquirePathLock() uses this to
make sure that the journal directory is mounted.
@return true if there are any journal files in the journal dir.
*/
bool haveJournalFiles(bool anyFiles = false);
/**
* Writes the specified uncompressed buffer to the journal.
*/
void WRITETOJOURNAL(const JSectHeader& h, const AlignedBuilder& uncompressed);
// in case disk controller buffers writes
const long long ExtraKeepTimeMs = 10000;
const unsigned JournalCommitIntervalDefault = 100;
}
}
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