本文介绍了FSCTL机制的基本原理，详细阐述了进程如何通过FSCTL调用执行针对文件或目录的操作。服务器接收到FSCTL请求后，会根据请求中的信息执行相应的操作。
关于FSCTL结构：
http://msdn.microsoft.com/en-us/library/cc232013(PROT.13).aspx
A process invokes an FSCTL on a handle to perform some action against the file or directory associated with the handle. When a server receives an FSCTL request, it SHOULD use the information in the request, which includes a handle and, optionally, an input data buffer, to perform the requested action. How a server performs the action requested by an FSCTL is implementation-dependent
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