# Bcachefs

> Linux filesystem supporting volume management, caching, checksumming, and snapshots

**Wikidata**: [Q60754748](https://www.wikidata.org/wiki/Q60754748)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Bcachefs)  
**Source**: https://4ort.xyz/entity/bcachefs

## Summary
Bcachefs is a modern, copy-on-write Linux filesystem that integrates volume management, caching, checksumming, and snapshots into a single system. Developed by Kent Overstreet, it is designed for high performance and reliability, leveraging technologies like B+ trees and Reed–Solomon erasure coding.

## Key Facts
- **Developer**: Kent Overstreet
- **License**: GNU General Public License, version 2.0
- **Based on**: bcache (a Linux kernel block layer cache)
- **Key technologies**: Copy-on-write, B+ tree indexing, Reed–Solomon erasure coding, checksumming
- **Features**: Filesystem-level encryption, compression, hierarchical storage management, multi-device support
- **Influences**: Inspired by Btrfs, ZFS, and bcache
- **Operating system**: Linux
- **Source code**: Hosted at [https://evilpiepirate.org/git/bcachefs.git/tree](https://evilpiepirate.org/git/bcachefs.git/tree)
- **Website**: [https://bcachefs.org/](https://bcachefs.org/)

## FAQs
### Q: What is Bcachefs used for?
A: Bcachefs is a general-purpose Linux filesystem that combines volume management, caching, checksumming, and snapshots, making it suitable for high-performance storage systems requiring data integrity and flexibility.

### Q: Who developed Bcachefs?
A: Bcachefs was developed by Kent Overstreet, building on his earlier work with bcache, a Linux kernel block layer cache.

### Q: What are the key features of Bcachefs?
A: Key features include copy-on-write operations, B+ tree indexing for performance, Reed–Solomon erasure coding for data redundancy, checksumming for integrity, and support for multi-device setups.

### Q: Is Bcachefs open-source?
A: Yes, Bcachefs is licensed under the GNU General Public License, version 2.0, making it free and open-source software.

### Q: How does Bcachefs compare to Btrfs or ZFS?
A: Bcachefs draws inspiration from Btrfs and ZFS but is designed to be a modern, high-performance alternative with features like erasure coding and hierarchical storage management.

## Why It Matters
Bcachefs addresses the need for a modern, high-performance filesystem in Linux that integrates advanced features like volume management, caching, and data integrity checks. By combining these capabilities into a single system, it simplifies storage management while ensuring reliability and performance. Its use of technologies like B+ trees and Reed–Solomon erasure coding makes it competitive with established filesystems like Btrfs and ZFS, offering a robust alternative for users seeking flexibility and efficiency in their storage solutions.

## Notable For
- **Multi-device support**: Designed as a multi-device filesystem, allowing for complex storage configurations.
- **Erasure coding**: Uses Reed–Solomon erasure coding for data redundancy, similar to RAID 5/6 implementations.
- **Checksumming**: Supports both metadata and data checksumming to ensure data integrity.
- **Performance**: Leverages B+ trees for high-performance indexing and low-latency operations.
- **Open-source**: Released under the GNU GPL v2.0, ensuring transparency and community collaboration.

## Body
### Overview
Bcachefs is a copy-on-write filesystem for Linux that integrates volume management, caching, checksumming, and snapshots. It is designed to be a modern, general-purpose filesystem with a focus on performance and reliability.

### Technical Features
- **Copy-on-write**: Ensures data consistency by writing changes to new blocks rather than overwriting existing data.
- **B+ tree indexing**: Provides high-performance and low-latency data access.
- **Reed–Solomon erasure coding**: Offers data redundancy and fault tolerance, similar to RAID 5/6.
- **Checksumming**: Supports checksumming for both metadata and data to detect and prevent corruption.
- **Multi-device support**: Allows for the integration of multiple storage devices into a single filesystem.

### Development and Influences
Bcachefs was developed by Kent Overstreet, who also worked on bcache, a Linux kernel block layer cache. The filesystem is influenced by Btrfs and ZFS, incorporating features from both while aiming to provide a modern alternative.

### Licensing and Availability
Bcachefs is licensed under the GNU General Public License, version 2.0, making it free and open-source software. The source code is available at [https://evilpiepirate.org/git/bcachefs.git/tree](https://evilpiepirate.org/git/bcachefs.git/tree), and the official website is [https://bcachefs.org/](https://bcachefs.org/).

## Schema Markup
```json
{
  "@context": "https://schema.org",
  "@type": "Thing",
  "name": "Bcachefs",
  "description": "Linux filesystem supporting volume management, caching, checksumming, and snapshots",
  "url": "https://bcachefs.org/",
  "sameAs": ["https://www.wikidata.org/wiki/Q104878140", "https://en.wikipedia.org/wiki/Bcachefs"],
  "additionalType": "https://schema.org/SoftwareApplication"
}

## References

1. [Source](https://bcachefs.org/bcachefs-principles-of-operation.pdf)