háromfs

háromfs is a journaling file system for the Linux operating system. It was originally developed by Petr Vancl for the Hurd operating system, but was later ported to Linux. The name "háromfs" is Hungarian and translates to "three file system," referring to its three main components: the metadata journal, the data journal, and the file system itself.

The primary design goal of háromfs was to provide strong data integrity and recoverability in the event of system crashes or power failures. It achieves this by using journaling, a technique where all file system modifications are first written to a journal before being applied to the main file system structures. This ensures that even if a crash occurs, the file system can be brought back to a consistent state by replaying the journal.

háromfs supports features commonly found in modern file systems, including support for large files and volumes, extended attributes, and POSIX access control lists. It is known for its robustness, though it may not offer the same performance as some other Linux file systems in certain benchmarks. The file system has seen less widespread adoption compared to ext4 or XFS, but it remains an option for users prioritizing data integrity.