// ensure file is open
        if( file.isOpen() == false ) {
            file.open( openFlags, 0, SmbFile.ATTR_NORMAL, options );
        }

        int w;
        do {
            w = len > writeSize ? writeSize : len;
            file.send( new SmbComWriteAndX( file.fid, fp, len - w, b, off, w, null ), write_andx_resp );
            fp += write_andx_resp.count;
            len -= write_andx_resp.count;

        // ensure file is open
        try ( SmbFileHandleImpl fh = ensureOpen();
              SmbTreeHandleImpl th = fh.getTree() ) {
            int w;
            do {
                w = len > this.writeSize ? this.writeSize : len;
                long cnt;

                if ( th.isSMB2() ) {
                    Smb2WriteRequest request = new Smb2WriteRequest(th.getConfig(), fh.getFileId());