Reiser4 Updated For The Linux 3.18 Kernel
While Linux 3.19 was released last week, just last week the Reiser4 team put out their first Linux 3.18 support code that targets the Linux 3.18.6 kernel. It takes some weeks after major kernel releases for the small Reiser4 team to update their out-of-tree code against the mainline kernel changes for compatibility with this once promising open-source file-system.
It doesn't appear there's any plans at this time still for trying to mainline Reiser4 with having no commercial backers or supporters of this successor to ReiserFS. The developers still involved with Reiser4 are mostly doing bug-fixes and maintaining support for new kernel versions without seeing much in the way of new feature development.
Those wishing to download Reiser4 for Linux 3.18 or older can find the code hosted on SourceForge.