The Kernel Linux version 6.6 has marked the ReiserFS file system as “obsolete” and is preparing to phase it out in the next 2-3 years.
ReiserFS is a file system developed by Hans Reiser, first released in 2001. It had modern features (at that time) such as journaling, which led to it being adopted as the primary file system by SUSE Linux Enterprise (discontinued in 2006).
However, as other file systems were developed with comparable features and Hans Reiser was convicted of murder, ReiserFS lost its serious support and ceased significant development. Eventually, the Kernel Linux team made the decision to deem it as obsolete.
Currently, different Linux distros have various file system options, such as ext4 (Debian, Ubuntu), XFS (RHEL), and Btrfs (SUSE).