Research And Implementation Of Private File System Based On Linux

Linux operate system has been widely used because of the advantage of free open source of software, stable kernel and efficiency. IT giants expressing their support for Linux operate system make the application of Linux expanding rapidly. Linux kernel has been used in both of traditional operate system, such as Redhat, Fedora, Ubuntu, and Android system released by Google. It would be safe to say that Linux operate system has pervaded every aspect of our life. So, it has been a priority of the agenda to enhance the security of Linux operating system, especially enhance the security of file system which is used to manage data.In the respect of data security, Linux file system introduces the concept of "user of file", "permission of access", and realize some mechanism based on these concepts to improve the data security. In Linux system, the permission of access is defined a kind of two-dimensional structure. There are three kind of permission of accessing to file:read, write and execute. For each of them, there are three kinds of users:the owner of file, the user in the same group with owner and other users. In the method, users of file have different permission of access, which ensures the data security to a certain extent.In the respect of data security, however, there are still some faults and loopholes in Linux file system. Illegal users may take advantage of these loopholes of file system to steal data of other user's. After research and analysis the principle and the existing safe leak of Linux file system, the paper introduces a plan which is used to improve file system security. Based on Linux file system, some improvements are made to form a new file system—private file system. The new improved file system has stronger ability of ensure the data, and its performance is not much worse than the old file system.Finally, this paper looks forward to the effect of the new private file system—how it affects the data security of Linux file system, how to make the design of the private file system, and how to improve the efficiency of the file system.