CS 537 Project 6

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Extended File Attributes (xattr) in xv6

Learning Objectives

System Programming & xv6

File System Design Concepts

Low-Level Hardware Awareness

Project Details

Recommended Approach

Introduction: What are Extended File Attributes?

Motivation: Why Do We Need Extended File Attributes?

Implementation: How Do We Implement Extended File Attributes?

Step 1: Define User-Space System Call Signatures

fgetxattr()

fsetxattr()

fremovexattr()

flistxattr()

Step 2: Implement the countusedb() System Call (Block Leak Testing)

countusedb()

Step 3: Implement File System Layer Building Blocks for System Calls

On-Disk File Layout with xattr

File System Layer Helper Functions

Important Appendix: xv6 Storage Stack

Essential Auxiliary Files