ch11 - perating System Concepts with Java 7 th Edition, Nov...

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Unformatted text preview: perating System Concepts with Java 7 th Edition, Nov 15, 2006 Silberschatz, Galvin and Gagne 2007 Chapter 11: File System Implementation 11.2 Silberschatz, Galvin and Gagne 2007 Operating System Concepts with Java 7 th Edition, Nov 15, 2006 Chapter 11: File System Implementation File-System Structure File-System Implementation Directory Implementation Allocation Methods Free-Space Management Efficiency and Performance Recovery Log-Structured File Systems NFS Example: WAFL File System 11.3 Silberschatz, Galvin and Gagne 2007 Operating System Concepts with Java 7 th Edition, Nov 15, 2006 Objectives To describe the details of implementing local file systems and directory structures To describe the implementation of remote file systems To discuss block allocation and free-block algorithms and trade-offs 11.4 Silberschatz, Galvin and Gagne 2007 Operating System Concepts with Java 7 th Edition, Nov 15, 2006 File-System Structure File structure Logical storage unit Collection of related information File system resides on secondary storage (disks) File system organized into layers File control block storage structure consisting of information about a file 11.5 Silberschatz, Galvin and Gagne 2007 Operating System Concepts with Java 7 th Edition, Nov 15, 2006 Layered File System 11.6 Silberschatz, Galvin and Gagne 2007 Operating System Concepts with Java 7 th Edition, Nov 15, 2006 A Typical File Control Block 11.7 Silberschatz, Galvin and Gagne 2007 Operating System Concepts with Java 7 th Edition, Nov 15, 2006 In-Memory File System Structures The following figure illustrates the necessary file system structures provided by the operating systems. Figure 12-3(a) refers to opening a file. Figure 12-3(b) refers to reading a file. 11.8 Silberschatz, Galvin and Gagne 2007 Operating System Concepts with Java 7 th Edition, Nov 15, 2006 In-Memory File System Structures 11.9 Silberschatz, Galvin and Gagne 2007 Operating System Concepts with Java 7 th Edition, Nov 15, 2006 Virtual File Systems Virtual File Systems (VFS) provide an object- oriented way of implementing file systems. VFS allows the same system call interface (the API) to be used for different types of file systems. The API is to the VFS interface, rather than any specific type of file system. 11.10 Silberschatz, Galvin and Gagne 2007 Operating System Concepts with Java 7 th Edition, Nov 15, 2006 Schematic View of Virtual File System 11.11 Silberschatz, Galvin and Gagne 2007 Operating System Concepts with Java 7 th Edition, Nov 15, 2006 Directory Implementation Linear list of file names with pointer to the data blocks....
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ch11 - perating System Concepts with Java 7 th Edition, Nov...

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