Just wanted to update on this — it’s a filesystem using a 
  red-black tree for directory indexing and CRC32 checksums 
  for consistency. Feel free to browse the source:

  https://github.com/nekernel-org/nekernel/blob/dev/dev/kernel/src/FS/HeFS.cc  
  https://github.com/nekernel-org/nekernel/blob/dev/dev/kernel/FSKit/HeFS.h  
  https://github.com/nekernel-org/nekernel/blob/dev/docs/tex/hefs.tex

  EDIT: Contributors are welcome to the project! Feel free to read the code, architecture and contribute back!