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Chapter 10 - File System Interface

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Wayne Jones Jnr
Wayne Jones Jnr

File Concept Access Methods Directory Structure File-System Mounting File Sharing Protection

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Chapter 10: File-System Interface
Chapter 10: File-System Interface ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Objectives ,[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],[object Object]
File Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Open Files ,[object Object],[object Object],[object Object],[object Object],[object Object]
Open File Locking ,[object Object],[object Object],[object Object],[object Object],[object Object]
File Locking Example – Java API ,[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],[object Object],[object Object],[object Object]
File Locking Example – Java API (cont) ,[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],[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]
Sequential-access File
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
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
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],[object Object],[object Object],[object Object]
General Graph Directory
General Graph Directory (Cont.) ,[object Object],[object Object],[object Object],[object Object]
File System Mounting ,[object Object],[object Object]
(a) Existing. (b) Unmounted Partition
Mount Point
File Sharing ,[object Object],[object Object],[object Object],[object Object]
File Sharing – Multiple Users ,[object Object],[object Object]
File Sharing – Remote File Systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
File Sharing – Failure Modes ,[object Object],[object Object],[object Object]
File Sharing – Consistency Semantics ,[object Object],[object Object],[object Object],[object Object],[object Object],[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
Windows XP Access-control List Management
A Sample UNIX Directory Listing
End of Chapter 10

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Chapter 10 - File System Interface