一个简单的文件系统（操作系统课程设计）主要任务是对用户文件和系统文件进行管理，以方便用户使用，并保证文件的安全性。文件管理具有对文件存储空间的管理、目录管理、文件的读/写管理以及文件的共享与保护功能。从用户的角度看，目录在用户（应用程序）所需要的文件名和文件之间提供一种映射，所以目录应实现“按名存取”，“按名存取”是目录管理中最基本的功能，也是文件系统向用户提供的最基本的服务。目录管理中有多种实现机制，其中二级目录机制可以解决多用户之间的文件重名问题，文件系统可以在目录上实现访问限制。

关于富基系统详细操作，前台POS，后台管理操作等业务流程，

书本上实例的源码。 The ninth edition of Operating System Concepts continues to evolve to provide a solid theoretical foundation for understanding operating systems. This edition has been updated with more extensive coverage of the most current topics and applications, improved conceptual coverage and additional content to bridge the gap between concepts and actual implementations. A new design allows for easier navigation and enhances reader motivation. Additional end-of-chapter, exercises, review questions, and programming exercises help to further reinforce important concepts. WileyPLUS, including a test bank, self-check exercises, and a student solutions manual, is also part of the comprehensive support package.