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File-System Interface

For most users, the file system is the most visible aspect of an operating system. It provides the mechanism for on-line storage of and access to both data and programs of the operating system and all the users of the computer system. The file system consists of two distinct parts: a collection of files, each storing related data, and a directory structure, which organizes and provides information about all the files in the system. File systems live on devices, which we described in the preceding chapter and will continue to discuss in the following one. In this chapter, we consider the various aspects of files and the major directory structures. We also discuss the semantics of sharing files among multiple processes, users, and computers. Finally, we discuss ways to handle file protection, necessary when we have multiple users and we want to control who may access files and how files may be accessed.

CHAPTER OBJECTIVES

  • To explain the function of file systems.
  • To describe the interfaces to file systems.
  • To discuss file-system design tradeoffs, including access methods, file sharing, file locking, and directory structures.
  • To explore file-system protection.

10.1 File Concept

Computers can store information on various storage media, such as hard disks, magnetic tapes, and optical disks. So that the computer system will be convenient to use, the operating ...

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