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// data_file.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/>.
*/
#include "mongo/pch.h"
#include "mongo/db/storage/data_file.h"
#include <boost/filesystem/operations.hpp>
#include "mongo/db/cmdline.h"
#include "mongo/db/d_concurrency.h"
#include "mongo/db/dur.h"
#include "mongo/db/lockstate.h"
#include "mongo/util/file_allocator.h"
namespace mongo {
static void data_file_check(void *_mb) {
if( sizeof(char *) == 4 )
uassert( 10084, "can't map file memory - mongo requires 64 bit build for larger datasets", _mb != 0);
else
uassert( 10085, "can't map file memory", _mb != 0);
}
int DataFile::maxSize() {
if ( sizeof( int* ) == 4 ) {
return 512 * 1024 * 1024;
}
else if ( cmdLine.smallfiles ) {
return 0x7ff00000 >> 2;
}
else {
return 0x7ff00000;
}
}
NOINLINE_DECL void DataFile::badOfs2(int ofs) const {
stringstream ss;
ss << "bad offset:" << ofs << " accessing file: " << mmf.filename() << " - consider repairing database";
uasserted(13441, ss.str());
}
NOINLINE_DECL void DataFile::badOfs(int ofs) const {
stringstream ss;
ss << "bad offset:" << ofs << " accessing file: " << mmf.filename() << " - consider repairing database";
uasserted(13440, ss.str());
}
int DataFile::defaultSize( const char *filename ) const {
int size;
if ( fileNo <= 4 )
size = (64*1024*1024) << fileNo;
else
size = 0x7ff00000;
if ( cmdLine.smallfiles ) {
size = size >> 2;
}
return size;
}
/** @return true if found and opened. if uninitialized (prealloc only) does not open. */
Status DataFile::openExisting( const char *filename ) {
verify( _mb == 0 );
if( !boost::filesystem::exists(filename) )
return Status( ErrorCodes::InvalidPath, "DataFile::openExisting - file does not exist" );
if( !mmf.open(filename,false) ) {
MONGO_DLOG(2) << "info couldn't open " << filename << " probably end of datafile list" << endl;
return Status( ErrorCodes::InternalError, "DataFile::openExisting - mmf.open failed" );
}
_mb = mmf.getView(); verify(_mb);
unsigned long long sz = mmf.length();
verify( sz <= 0x7fffffff );
verify( sz % 4096 == 0 );
if( sz < 64*1024*1024 && !cmdLine.smallfiles ) {
if( sz >= 16*1024*1024 && sz % (1024*1024) == 0 ) {
log() << "info openExisting file size " << sz << " but cmdLine.smallfiles=false: "
<< filename << endl;
}
else {
log() << "openExisting size " << sz << " less then minimum file size expectation "
<< filename << endl;
verify(false);
}
}
data_file_check(_mb);
return Status::OK();
}
void DataFile::open( const char *filename, int minSize, bool preallocateOnly ) {
long size = defaultSize( filename );
while ( size < minSize ) {
if ( size < maxSize() / 2 )
size *= 2;
else {
size = maxSize();
break;
}
}
if ( size > maxSize() )
size = maxSize();
verify( size >= 64*1024*1024 || cmdLine.smallfiles );
verify( size % 4096 == 0 );
if ( preallocateOnly ) {
if ( cmdLine.prealloc ) {
FileAllocator::get()->requestAllocation( filename, size );
}
return;
}
{
verify( _mb == 0 );
unsigned long long sz = size;
if( mmf.create(filename, sz, false) )
_mb = mmf.getView();
verify( sz <= 0x7fffffff );
size = (int) sz;
}
data_file_check(_mb);
header()->init(fileNo, size, filename);
}
void DataFile::flush( bool sync ) {
mmf.flush( sync );
}
DiskLoc DataFile::allocExtentArea( int size ) {
massert( 10357, "shutdown in progress", !inShutdown() );
massert( 10359, "header==0 on new extent: 32 bit mmap space exceeded?", header() ); // null if file open failed
size = min(header()->unusedLength, size);
int offset = header()->unused.getOfs();
DataFileHeader *h = header();
h->unused.writing().set( fileNo, offset + size );
getDur().writingInt(h->unusedLength) = h->unusedLength - size;
return DiskLoc( fileNo, offset );
}
// -------------------------------------------------------------------------------
void DataFileHeader::init(int fileno, int filelength, const char* filename) {
if ( uninitialized() ) {
DEV log() << "datafileheader::init initializing " << filename << " n:" << fileno << endl;
if( !(filelength > 32768 ) ) {
massert(13640, str::stream() << "DataFileHeader looks corrupt at file open filelength:" << filelength << " fileno:" << fileno, false);
}
{
// "something" is too vague, but we checked for the right db to be locked higher up the call stack
if( !Lock::somethingWriteLocked() ) {
LockState::Dump();
log() << "*** TEMP NOT INITIALIZING FILE " << filename << ", not in a write lock." << endl;
log() << "temp bypass until more elaborate change - case that is manifesting is benign anyway" << endl;
return;
/**
log() << "ERROR can't create outside a write lock" << endl;
printStackTrace();
::abort();
**/
}
}
getDur().createdFile(filename, filelength);
verify( HeaderSize == 8192 );
DataFileHeader *h = getDur().writing(this);
h->fileLength = filelength;
h->version = PDFILE_VERSION;
h->versionMinor = PDFILE_VERSION_MINOR_22_AND_OLDER; // All dbs start like this
h->unused.set( fileno, HeaderSize );
verify( (data-(char*)this) == HeaderSize );
h->unusedLength = fileLength - HeaderSize - 16;
}
}
}
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