Ch11 OS

Chapter 11: File-System Interface ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

File Concept ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

File Structure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

File Attributes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

File Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

File Types – Name, Extension

Access Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Simulation of Sequential Access on a Direct-access File

Example of Index and Relative Files

Directory Structure ,[object Object],F 1 F 2 F 3 F 4 F n Directory Files Both the directory structure and the files reside on disk. Backups of these two structures are kept on tapes.

A Typical File-system Organization

Information in a Device Directory ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Operations Performed on Directory ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Organize the Directory (Logically) to Obtain ,[object Object],[object Object],[object Object],[object Object],[object Object]

Single-Level Directory ,[object Object],Naming problem Grouping problem

Two-Level Directory ,[object Object],[object Object],[object Object],[object Object],[object Object]

Tree-Structured Directories (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Tree-Structured Directories (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],mail prog copy prt exp count Deleting “mail”  deleting the entire subtree rooted by “mail”.

Acyclic-Graph Directories ,[object Object]

Acyclic-Graph Directories (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

General Graph Directory (Cont.) ,[object Object],[object Object],[object Object],[object Object]

File System Mounting ,[object Object],[object Object]

(a) Existing. (b) Unmounted Partition

File Sharing ,[object Object],[object Object],[object Object],[object Object]

Protection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Access Lists and Groups ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],owner group public chmod 761 game Attach a group to a file chgrp G game

Ch11 OS

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Ch11 OS