linux文件过滤驱动程序，实现文件透明加解密-linux file system filter driver, to achieve transparent encryption file

linux下的文件过滤驱动，附带详细的报告，很简单的实现，但是功能齐全，有兴趣的可以学习一下。-file system filter driver under linux, with a detailed report, it is easy to achieve, but fully functional, interested to learn about.