NBD客户端和服务器在同一台机器上
是否有任何方法可以在同一台计算机上运行 NBD（网络块设备）客户端和服务器而不导致系统死锁？
我非常疲惫地寻找这个问题的答案。如果有人可以提供帮助，我将不胜感激。
更新：
我正在编写一个与 Google 存储系统通信的 NBD 服务器。我想在 NBD 上挂载文件系统并备份我的文件。如果我最终不得不在另一台机器上运行服务器，我会非常失望。我已经有的一些想法似乎没有任何结果：
- 告诉文件系统使用 O_DIRECT 标志打开块设备，
- 以使用原始设备绕过 Linux 缓冲区缓存（不幸的是，原始设备是字符设备，FSes 拒绝将它们用作底层设备）
Is there any way to run an NBD (Network Block Device) client and server on the same machine without deadlocking the system?
I am very exhausted looking to find an answer for this. I appreciate if anyone can help.
UPDATE:
I'm writing an NBD server that talks to Google Storage system. I want to mount a file system on the NBD and backup my files. I will be hugely disappointed if I have to end up running the server on another machine. Few ideas I already had seem to lead nowhere:
- telling the file system to open the block device using O_DIRECT flag to bypass the linux buffer cache
- using a raw device (unfortunately, raw devices are character devices and FSes refuse to use them as underlying device)
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仅供记录，自 2008。
Just for the record, having the NBD client and server on the same machine has been possible since 2008.
使用虚拟机（不是容器）——您需要两个内核，但不需要两台物理机。
Use a virtual machine (not a container) - you need two kernels, but you don't need two physical machines.
由于 NBD Sourceforge 项目的首页表示在这种情况下“几秒钟内”就会发生死锁，我猜答案是肯定的“不”。
尝试写一个更完整的问题来说明您想要实现的实际目标。有时您需要解决一个小问题，有时您需要着眼于大局。
Since the front page of the Sourceforge project for NBD say that a deadlock will happen "within seconds" in this scenario, I'm guessing the answer is a big "No."
Try to write a more complete question of what actual goal you're trying to accomplish. There's some times that you need to bang away at a little problem, and some times that you need to look at the big picture.