Links:
GitHub URL: https://github.com/asomers/fsx-rs FreshPorts URL: https://www.freshports.org/devel/fsx/

Contact: Alan Somers <asomers@freebsd.org>

The venerable FSX (File System eXerciser) tool, first written at Apple Computer in the nineties, has been a part of FreeBSD since 5.0. It stress tests file systems with a stream of randomly generated operations, verifying file data after every read. However, it has never been installed as part of the OS; it only exists in the source tree. That makes it difficult to use in CI pipelines. It has some other limitations, too.

So this quarter I rewrote the entire tool in Rust. The rewrite is byte-for-byte compatible with the original, given identical seed values. Future versions will break backwards-compatibility, however, in order to add new features like fspacectl and copy_file_range. The new version can be found in the ports tree, and in time I’ll remove the original.