filesystem

代码说明：

说明：  这是一个二级文件系统，能够在linux下编译并执行，通过程序模拟Linux文件系统，用一个二进制文件(FileSystem.disk)来模拟磁盘.设计一个多用户的二级文件系经统、实现一般的创建文件、目录，删除文件、目录，切换目录，打开、关闭文件、读写文件等操作。(This is a secondary file system, can be compiled under linux and implement, through the Linux file system simulation, with a binary file (FileSystem.disk) to simulate the disk. To design a multi-user document by the two systems, the realization of the general the creation of files, directories, delete files, directory, switch directory, open, close the file, read and write files to operate.)