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// @file durop.cpp
/**
* 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kStorage
#include "mongo/platform/basic.h"
#include "mongo/db/storage/mmap_v1/durop.h"
#include <boost/filesystem/operations.hpp>
#include <boost/shared_ptr.hpp>
#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/storage/mmap_v1/aligned_builder.h"
#include "mongo/db/storage/mmap_v1/durable_mapped_file.h"
#include "mongo/db/storage/mmap_v1/mmap_v1_engine.h"
#include "mongo/util/file.h"
#include "mongo/util/file_allocator.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
using boost::scoped_array;
using boost::shared_ptr;
using std::endl;
using std::string;
namespace dur {
/** read a durop from journal file referenced by br.
@param opcode the opcode which has already been written from the bufreader
*/
shared_ptr<DurOp> DurOp::read(unsigned opcode, BufReader& br) {
shared_ptr<DurOp> op;
switch (opcode) {
case JEntry::OpCode_FileCreated:
op = shared_ptr<DurOp>(new FileCreatedOp(br));
break;
case JEntry::OpCode_DropDb:
op = shared_ptr<DurOp>(new DropDbOp(br));
break;
default:
massert(13546,
(str::stream() << "journal recover: unrecognized opcode in journal " << opcode),
false);
}
return op;
}
void DurOp::serialize(AlignedBuilder& ab) {
ab.appendNum(_opcode);
_serialize(ab);
}
DropDbOp::DropDbOp(BufReader& log) : DurOp(JEntry::OpCode_DropDb) {
unsigned long long reserved;
log.read(reserved);
log.read(reserved);
log.readStr(_db);
string reservedStr;
log.readStr(reservedStr);
}
void DropDbOp::_serialize(AlignedBuilder& ab) {
ab.appendNum((unsigned long long)0); // reserved for future use
ab.appendNum((unsigned long long)0); // reserved for future use
ab.appendStr(_db);
ab.appendStr(""); // reserved
}
/** throws */
void DropDbOp::replay() {
log() << "recover replay drop db " << _db << endl;
_deleteDataFiles(_db);
}
FileCreatedOp::FileCreatedOp(const std::string& f, unsigned long long l)
: DurOp(JEntry::OpCode_FileCreated) {
_p = RelativePath::fromFullPath(storageGlobalParams.dbpath, f);
_len = l;
}
FileCreatedOp::FileCreatedOp(BufReader& log) : DurOp(JEntry::OpCode_FileCreated) {
unsigned long long reserved;
log.read(reserved);
log.read(reserved);
log.read(_len); // size of file, not length of name
string s;
log.readStr(s);
_p._p = s;
}
void FileCreatedOp::_serialize(AlignedBuilder& ab) {
ab.appendNum((unsigned long long)0); // reserved for future use
ab.appendNum((unsigned long long)0); // reserved for future use
ab.appendNum(_len);
ab.appendStr(_p.toString());
}
string FileCreatedOp::toString() {
return str::stream() << "FileCreatedOp " << _p.toString() << ' ' << _len / 1024.0 / 1024.0
<< "MB";
}
// if an operation deletes or creates a file (or moves etc.), it may need files closed.
bool FileCreatedOp::needFilesClosed() {
return boost::filesystem::exists(_p.asFullPath());
}
void FileCreatedOp::replay() {
// i believe the code assumes new files are filled with zeros. thus we have to recreate the file,
// or rewrite at least, even if it were the right length. perhaps one day we should change that
// although easier to avoid defects if we assume it is zeros perhaps.
string full = _p.asFullPath();
if (boost::filesystem::exists(full)) {
try {
boost::filesystem::remove(full);
} catch (std::exception& e) {
LOG(1) << "recover info FileCreateOp::replay unlink " << e.what() << endl;
}
}
log() << "recover create file " << full << ' ' << _len / 1024.0 / 1024.0 << "MB" << endl;
if (boost::filesystem::exists(full)) {
// first delete if exists.
try {
boost::filesystem::remove(full);
} catch (...) {
log() << "warning could not delete file " << full << endl;
}
}
ensureParentDirCreated(full);
File f;
f.open(full.c_str());
massert(13547, str::stream() << "recover couldn't create file " << full, f.is_open());
unsigned long long left = _len;
const unsigned blksz = 64 * 1024;
scoped_array<char> v(new char[blksz]);
memset(v.get(), 0, blksz);
fileofs ofs = 0;
while (left) {
unsigned long long w = left < blksz ? left : blksz;
f.write(ofs, v.get(), (unsigned)w);
left -= w;
ofs += w;
}
f.fsync();
flushMyDirectory(full);
massert(13628, str::stream() << "recover failure writing file " << full, !f.bad());
}
}
}
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