Chapter 12 File Management

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Chapter 12 File Management Operating Systems: Internals and Design Principles, 6/E William Stallings Chapter 12 File Management -extra info, Unix and Windows file systems- Patricia Roy Manatee Community College, Venice, FL ©2008, Prentice Hall

UNIX File Management Types of files Regular, or ordinary Directory Special Named pipes Links Symbolic links

Inodes Index node Control structure that contains key information for a particular file

Structure of FreeBSDInodeand File

UNIX Directories and Inodes

UNIX File Access Control

UNIX File Access Control

Linux Virtual File System Uniform file system interface to user processes Represents any conceivable file system’s general feature and behavior Assumes files are objects that share basic properties regardless of the target file system

Linux Virtual File System Context

Linux Virtual File System Concept

Primary Objects in VFS Superblock object Inode object Dentry object Represents a specific mounted file system Inode object Represents a specific file Dentry object Represents a specific directory entry File object Represents an open file associated with a process

Windows File System Key features of NTFS Recoverability Security Large disks and large files Multiple data streams Journaling Compression and Encryption

NTFS Volume and File Structure Sector The smallest physical storage unit on the disk Cluster One or more contiguous sectors Volume Logical partition on a disk

Windows NTFS Components

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