Ejemplo n.º 1
0
    // todo: this is called a lot. streamline the common case
    MongoDataFile* Database::getFile( int n, int sizeNeeded , bool preallocateOnly) {
        assert(this);
        DEV assertDbAtLeastReadLocked(this);

        namespaceIndex.init();
        if ( n < 0 || n >= DiskLoc::MaxFiles ) {
            out() << "getFile(): n=" << n << endl;
            massert( 10295 , "getFile(): bad file number value (corrupt db?): run repair", false);
        }
        DEV {
            if ( n > 100 ) {
                out() << "getFile(): n=" << n << endl;
            }
        }
        MongoDataFile* p = 0;
        if ( !preallocateOnly ) {
            while ( n >= (int) _files.size() ) {
                assert(this);
                if( !Lock::isWriteLocked(this->name) ) {
                    log() << "error: getFile() called in a read lock, yet file to return is not yet open" << endl;
                    log() << "       getFile(" << n << ") _files.size:" <<_files.size() << ' ' << fileName(n).string() << endl;
                    log() << "       context ns: " << cc().ns() << " openallfiles:" << _openAllFiles << endl;
                    assert(false);
                }
                _files.push_back(0);
            }
            p = _files[n];
        }
        if ( p == 0 ) {
            assertDbWriteLocked(this);
            boost::filesystem::path fullName = fileName( n );
            string fullNameString = fullName.string();
            p = new MongoDataFile(n);
            int minSize = 0;
            if ( n != 0 && _files[ n - 1 ] )
                minSize = _files[ n - 1 ]->getHeader()->fileLength;
            if ( sizeNeeded + DataFileHeader::HeaderSize > minSize )
                minSize = sizeNeeded + DataFileHeader::HeaderSize;
            try {
                p->open( fullNameString.c_str(), minSize, preallocateOnly );
            }
            catch ( AssertionException& ) {
                delete p;
                throw;
            }
            if ( preallocateOnly )
                delete p;
            else
                _files[n] = p;
        }
        return preallocateOnly ? 0 : p;
    }
Ejemplo n.º 2
0
    MongoDataFile* Database::getFile( int n, int sizeNeeded , bool preallocateOnly) {
        assert(this);

        namespaceIndex.init();
        if ( n < 0 || n >= DiskLoc::MaxFiles ) {
            out() << "getFile(): n=" << n << endl;
            massert( 10295 , "getFile(): bad file number value (corrupt db?): run repair", false);
        }
        DEV {
            if ( n > 100 )
                out() << "getFile(): n=" << n << "?" << endl;
        }
        MongoDataFile* p = 0;
        if ( !preallocateOnly ) {
            while ( n >= (int) files.size() )
                files.push_back(0);
            p = files[n];
        }
        if ( p == 0 ) {
            boost::filesystem::path fullName = fileName( n );
            string fullNameString = fullName.string();
            p = new MongoDataFile(n);
            int minSize = 0;
            if ( n != 0 && files[ n - 1 ] )
                minSize = files[ n - 1 ]->getHeader()->fileLength;
            if ( sizeNeeded + DataFileHeader::HeaderSize > minSize )
                minSize = sizeNeeded + DataFileHeader::HeaderSize;
            try {
                p->open( fullNameString.c_str(), minSize, preallocateOnly );
            }
            catch ( AssertionException& ) {
                delete p;
                throw;
            }
            if ( preallocateOnly )
                delete p;
            else
                files[n] = p;
        }
        return preallocateOnly ? 0 : p;
    }