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// extent.cpp
/**
* Copyright (C) 2013 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.
*/
#include "mongo/db/storage/mmap_v1/extent.h"
#include "mongo/db/storage/mmap_v1/extent_manager.h"
#include "mongo/util/hex.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
using std::iostream;
using std::string;
using std::vector;
BOOST_STATIC_ASSERT(sizeof(Extent) - 4 == 48 + 128);
BSONObj Extent::dump() const {
return BSON("loc" << myLoc.toString() << "xnext" << xnext.toString() << "xprev"
<< xprev.toString() << "nsdiag" << nsDiagnostic.toString() << "size" << length
<< "firstRecord" << firstRecord.toString() << "lastRecord"
<< lastRecord.toString());
}
void Extent::dump(iostream& s) const {
s << " loc:" << myLoc.toString() << " xnext:" << xnext.toString()
<< " xprev:" << xprev.toString() << '\n';
s << " nsdiag:" << nsDiagnostic.toString() << '\n';
s << " size:" << length << " firstRecord:" << firstRecord.toString()
<< " lastRecord:" << lastRecord.toString() << '\n';
}
bool Extent::validates(const DiskLoc diskLoc, vector<string>* errors) const {
bool extentOk = true;
if (magic != extentSignature) {
if (errors) {
StringBuilder sb;
sb << "bad extent signature " << integerToHex(magic) << " in extent "
<< diskLoc.toString();
errors->push_back(sb.str());
}
extentOk = false;
}
if (myLoc != diskLoc) {
if (errors) {
StringBuilder sb;
sb << "extent " << diskLoc.toString() << " self-pointer is " << myLoc.toString();
errors->push_back(sb.str());
}
extentOk = false;
}
if (firstRecord.isNull() != lastRecord.isNull()) {
if (errors) {
StringBuilder sb;
if (firstRecord.isNull()) {
sb << "in extent " << diskLoc.toString()
<< ", firstRecord is null but lastRecord is " << lastRecord.toString();
} else {
sb << "in extent " << diskLoc.toString() << ", firstRecord is "
<< firstRecord.toString() << " but lastRecord is null";
}
errors->push_back(sb.str());
}
extentOk = false;
}
static const int minSize = 0x1000;
if (length < minSize) {
if (errors) {
StringBuilder sb;
sb << "length of extent " << diskLoc.toString() << " is " << length
<< ", which is less than minimum length of " << minSize;
errors->push_back(sb.str());
}
extentOk = false;
}
return extentOk;
}
}
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