Howsit, thought I might suppliment my devember2021 effort (brutally simple firewall) with something that has been weighing on my mind recently (fs=filesystem)
a hybrid filesystem, that can be used to interpose between a fs startpoint and fs endpoint(s) (files and/or directories), used as RAM only fs (re/create on mount), or create compacted inode compatible fs for traditionally sparse (read: wasteful) inode fs structures (eg1 web server user and/or hostname tree and subree structures.) (eg2 IPv4/IPv6 catalog as filenames)