FTRFS: Bringing Radiation-Robust Filesystem Principles to Contemporary Linux

A Reed–Solomon, MIL-STD-882E-Aligned Implementation Technical Report — Version 1 We present FTRFS, a Linux filesystem for radiation-robust embedded environments. Building on the original concept of Fuchs, Langer and Trinitis (ARCS 2015), the present implementation is a contemporary response to the 2015 problem statement under the standards and tooling that have emerged in the intervening eleven years: the Linux kernel's mature lib/reed_solomon infrastructure, MIL-STD-882E hazard tracking practice for software-intensive systems, and reproducible embedded builds via the Yocto Project. FTRFS combines universal Reed–Solomon forward error correction on metadata (inodes, allocation bitmap, superblock), a persistent on-disk radiation event journal, and fail-closed mount semantics. To our knowledge, no other Linux filesystem combines these three properties. This Technical Report v1 documents the project state at commit 9a63468: stage 3 partial closure, format v3 stable, format v4 design frozen but not yet implemented, validation on a hardened arm64 build (Yocto Scarthgap, linux-mainline 7.0.1, zero unpatched kernel CVE), and an I/O baseline captured on a four-node libvirt cluster. This is part of a versioned publication roadmap (v2–v4) following the project's engineering milestones. Source LaTeX, bibliography, dataset, and build instructions are publicly available at https://github.com/roastercode/FTRFS under papers/2026-04-ftrfs-v1/.