Jaegeuk Kim sent in his updates of F2FS (the Flash-Friendly File-System) for the Linux 4.1 kernel.
New F2FS file-system features for this next kernel release include an in-memory extent_cache, an fs_shutdown feature to test power-off recovery, now uses inline_data to store a symlink path, F2FS is now shown as a non-misc file-system.