我使用了类bufferlist的ceph，但在抛出&#39；ceph：：缓冲区：：bad_alloc&#39；what（）：缓冲区：：bad_alloc

我使用了类bufferlist的ceph，但在抛出“ceph：：buffer:：bad_alloc”what（）：buffer:：bad_alloc的实例后调用了终止

我使用image.write（）将数据上传到ceph。成功现在我使用image.read（）从ceph加载数据。找到错误“抛出‘ceph：：buffer:：bad_alloc‘what（）：buffer:：bad_alloc’实例后调用终止”。我的代码如下

string file_path="/root/Documents/p.txt";
    char * buffer;
    size_t buffer_len;
    ret=read_file(buffer,file_path,buffer_len);
    ceph::bufferlist bl;
    string s;
    //ret=bl.read_file(file_path.c_str(),&s);
    //cout<<"read file and ret is "<<ret<<"  the error string is "<<s<<endl;

    bl.append(buffer,buffer_len);
    size_t len=bl.length();
    cout<<"len is "<<len<<endl;
 
    image.write2(0,len,bl,0);
    if (ret < 0) {
      std::cerr << "couldn't write to the rbd image! error " << ret << std::endl;
      ret = EXIT_FAILURE;
      goto out;
    } else {
      std::cout << "we just wrote data to our rbd image " << std::endl;
    
    /*
     * let's read the image and compare it to the data we wrote
     */
    ceph::bufferlist bl_r;
    cout<<"int len is "<<static_cast<int>(len)<<endl;
    bl_r.append_zero(len);

镜头为2102341024，超过2GB。如果len为1GB，则无错误

我希望能找到bufferlist的文档。我不知道他是如何在内部实现数据存储和内存应用程序的。