模拟一个文件系统，包括目录文件，普通文件，并实现对它们的一些基本操作。假定每个目录文件最多只能占用一个块；一个目录项包括文件名，文件类型，文件长度，指向文件内容的指针内容。普通文件可以只用目录项代表。-Simulation of a file system, including the directory of files, common files, and to achieve some of their basic operation. Paper assumes that each directory can only occupy one block　a directory entry, including file name, file type, file length, the indicators point to the contents of the content of the document. Ordinary files can be used only on behalf of the directory.