/usr/include/mongo/db/dur_journalimpl.h is in mongodb-dev 1:2.4.9-1ubuntu2.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 | // @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/>.
*/
#pragma once
#include "dur_journalformat.h"
#include "../util/logfile.h"
namespace mongo {
namespace dur {
/** the writeahead journal for durability */
class Journal {
public:
string dir; // set by journalMakeDir() during initialization
Journal();
/** call during startup by journalMakeDir() */
void init();
/** 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.
thread: durThread()
*/
void rotate();
/** append to the journal file
*/
void journal(const JSectHeader& h, const AlignedBuilder& b);
boost::filesystem::path getFilePathFor(int filenumber) const;
unsigned long long lastFlushTime() const { return _lastFlushTime; }
void cleanup(bool log); // closes and removes journal files
unsigned long long curFileId() const { return _curFileId; }
void assureLogFileOpen() {
SimpleMutex::scoped_lock lk(_curLogFileMutex);
if( _curLogFile == 0 )
_open();
}
/** open a journal file to journal operations to. */
void open();
private:
/** check if time to rotate files. assure a file is open.
* internally called with every commit
*/
void _rotate();
void _open();
void closeCurrentJournalFile();
void removeUnneededJournalFiles();
unsigned long long _written; // bytes written so far to the current journal (log) file
unsigned _nextFileNumber;
SimpleMutex _curLogFileMutex;
LogFile *_curLogFile; // use _curLogFileMutex
unsigned long long _curFileId; // current file id see JHeader::fileId
struct JFile {
string filename;
unsigned long long lastEventTimeMs;
};
// files which have been closed but not unlinked (rotated out) yet
// ordered oldest to newest
list<JFile> _oldJournalFiles; // use _curLogFileMutex
// lsn related
static void preFlush();
static void postFlush();
unsigned long long _preFlushTime;
unsigned long long _lastFlushTime; // data < this time is fsynced in the datafiles (unless hard drive controller is caching)
bool _writeToLSNNeeded;
void updateLSNFile();
};
}
}
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