文件管理功能 文件系统的多线程访问机制，文件管理功能，也就是编写几个完整的系统调用函数，它们可以实现文件的更名、删除、拷贝。 -Multithreaded access mechanism file management file system, file management functions, which is to write several complete system call function, they can rename files, delete, copy.