OS File System Implementation

OS File System Implementation Visually

Advanced File System Implementation with interactive visualizations, real-time animations, and dynamic simulations for comprehensive learning of file system concepts.

x8s Structure Buffer Cache Journaling File Allocation Directory Structure File Protection
File System Implementation Control
Used Blocks: 0
Utilization: 0%
Fragmentation: 0%
Disk Blocks (100 blocks) x8s-based File System
File Directory
No files allocated

0

Total Files

0%

Disk Utilization

0%

Fragmentation

100%

Access Efficiency

0%

Cache Hit Rate

0

Journal Entries

Select file system method and create files to see implementation details

File System Implementation

File system implementation involves complex structures and algorithms to manage files on storage devices. This simulation demonstrates key concepts including x8s structures, buffer caching, and journaling.

  • x8s-based: Unix-style file system with metadata separation
  • Buffer Cache: In-memory cache for improved performance
  • Journaling: Transactional approach for data integrity

x8s-based File System

The x8s-based file system separates file metadata from file data. Each file has an x8s containing metadata and pointers to data blocks.

Advantages
  • Efficient metadata management
  • Hard links support
  • Fast directory operations
  • Scalable for large systems
Disadvantages
  • Complex implementation
  • x8s exhaustion possible
  • Metadata overhead
  • Requires careful design

Implementation Details

struct x8s { int inode_number; int file_type; int permissions; int owner_id; int group_id; int file_size; int block_count; time_t last_access; time_t last_modify; time_t last_change; int direct_blocks[12]; int indirect_block; int double_indirect; int triple_indirect; }; struct DirectoryEntry { int inode_number; char name[256]; };

Implementation Steps

1

x8s Allocation

When a file is created, an x8s is allocated from the x8s table to store metadata.

2

Data Block Allocation

Data blocks are allocated from free block list and linked to the x8s through direct/indirect pointers.

3

Directory Entry Creation

A directory entry is created linking the file name to its x8s number in the parent directory.

4

Buffer Cache Management

Frequently accessed blocks are cached in memory to reduce disk I/O operations.

5

Journaling Operations

All file system changes are logged in a journal before being applied to ensure consistency.

Key Concepts

  • x8s: Data structure storing file metadata and block pointers
  • Buffer Cache: In-memory cache for frequently accessed disk blocks
  • Journaling: Technique to ensure file system consistency after crashes
  • Hard Links: Multiple directory entries pointing to the same x8s
  • Symbolic Links: Special files containing pathnames to other files

How to Use

  1. Select a file system method from dropdown
  2. Enter file name and size
  3. Click Allocate to create files
  4. Use Delete to remove files
  5. Try Defrag to reduce fragmentation
  6. Use Journal and Cache to see advanced features
  7. Click Reset to clear the disk

Observe how different file system concepts affect disk usage, performance, and data integrity!