#OSdev 04 Coding your own File System in C

About this Video

• Video Title: #OSdev 04 Coding your own File System in C
• Channel: dr Jonas Birch
• Speakers: dr Jonas Birch
• Duration: 6:47:35

Introduction

This video demonstrates the creation of a custom file system in C. The speaker outlines a plan, details data structures, and implements core functions like formatting, bitmap handling, and file management. The goal is a functional file system within the context of an operating system development project.

Key Takeaways

1. File System Design Planning: The video begins with a detailed plan outlining the various functions required for a file system, including formatting, mounting, inode handling, and read/write operations. This illustrates a structured approach to OS development.
2. Data Structure Implementation: Significant time is dedicated to defining and implementing crucial data structures like the file system structure itself, inodes (including file names and pointers), and the free block bitmap. This highlights the importance of well-designed data structures in system programming.
3. Custom I/O Library: The speaker avoids using standard C libraries, opting to create a custom I/O library (OmniSD) to manage disk operations. This emphasizes the need for low-level control in OS development.
4. Bitmap Implementation: The video covers the implementation of a bitmap to track free and occupied disk blocks, showcasing efficient memory management techniques in OS development.
5. Formatting and Mounting Functions: The speaker implements a formatting function to initialize the disk and a mounting function to make the file system accessible.