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Linux Kernel Journey
Linux Kernel Journey
Mar 22, 2026 · Fundamentals

Understanding EROFS: A Read‑Only Linux File System for Immutable Deployments

EROFS is a security‑focused, high‑performance read‑only Linux kernel file system designed for immutable scenarios such as container images, OS partitions, and AI model distribution, offering block‑aligned storage, minimal metadata, native compression, and host‑side page‑cache sharing to improve startup speed and reduce storage overhead.

EROFSLinux kernelcompression
0 likes · 15 min read
Understanding EROFS: A Read‑Only Linux File System for Immutable Deployments
vivo Internet Technology
vivo Internet Technology
Oct 30, 2024 · Fundamentals

vivo's Linux Kernel Innovation at the 19th China Linux Kernel Developer Conference

At the 19th China Linux Kernel Developer Conference, vivo unveiled nine open‑source innovations—including DMA‑BUF DIO for AI model loading, ZHP memory compression, EROFS and f2fs filesystem enhancements, and I/O optimizations—contributing significant performance gains and demonstrating its commitment to Linux kernel advancement worldwide.

DMA-BUFEROFSF2FS
0 likes · 6 min read
vivo's Linux Kernel Innovation at the 19th China Linux Kernel Developer Conference
Coolpad Technology Team
Coolpad Technology Team
Apr 27, 2023 · Cloud Computing

EROFS Cluster Mode Analysis in Linux Kernel 6.x

This article analyzes the EROFS cluster modes (INFLIGHT, HOOKED, FOLLOWED, FOLLOWED_NOINPLACE) in Linux kernel 6.x, explaining how they determine whether in-place I/O can be used based on the current status of pclusters in the chain.

Cluster ModesEROFSIn-place I/O
0 likes · 6 min read
EROFS Cluster Mode Analysis in Linux Kernel 6.x
Alibaba Cloud Native
Alibaba Cloud Native
Jun 16, 2022 · Cloud Native

How Nydus’s RAFS v6 and EROFS over fscache Deliver Near‑Native Container Image Performance

The article explains how Nydus’s new RAFS v6 image format, built on the kernel‑native EROFS filesystem and integrated with fscache, overcomes the performance and scalability limitations of traditional OCIv1 and user‑space container image solutions by enabling kernel‑mode on‑demand loading, fine‑grained chunk deduplication, asynchronous prefetching, and superior I/O efficiency, with benchmark results demonstrating near‑native speeds.

ContainerEROFSFilesystem
0 likes · 18 min read
How Nydus’s RAFS v6 and EROFS over fscache Deliver Near‑Native Container Image Performance
Coolpad Technology Team
Coolpad Technology Team
Mar 23, 2022 · Backend Development

Implementation of EROFS Tail‑Packing Inline Compression in Linux Kernel 5.17

This article explains the design and implementation of the EROFS tail‑packing inline compression feature merged in Linux kernel 5.17, covering modifications to the on‑disk format, mkfs and kernel code paths, new inode structures, map‑block handling, and performance considerations with detailed code excerpts.

EROFSFilesysteminline compression
0 likes · 16 min read
Implementation of EROFS Tail‑Packing Inline Compression in Linux Kernel 5.17
OPPO Kernel Craftsman
OPPO Kernel Craftsman
Oct 23, 2020 · Operations

Read-only Compressed File Systems: CramFS, SquashFS, CromFS, and EROFS Comparison

Read‑only compressed file systems such as CramFS, SquashFS, CromFS, and the newer EROFS provide space‑saving, non‑writable storage for embedded devices, with CramFS limited by small file and filesystem sizes, SquashFS offering large limits and flexible chunking, CromFS focusing on maximal compression, and EROFS improving performance and memory usage through fixed‑output LZ4 compression and in‑place decompression.

EROFSLZ4Linux filesystem
0 likes · 10 min read
Read-only Compressed File Systems: CramFS, SquashFS, CromFS, and EROFS Comparison