All  that  fuzz  about  checksums  and  filesystems  made me look into
  filesystem development.

  Don't worry, I'm not delusional enough to think that I can  write  the
  next  big  filesystem  from  scratch.  I'm pretty sure that takes many
  years of experience. It's still an interesting topic -- and  you  have
  to start somewhere.

  There's this wonderful repo:

  https://github.com/psankar/simplefs

  That  guy  has  written  a simple filesystem for Linux. I haven't even
  checked if you can actually use it, because it's much more interesting
  to  read  the  code  in  early  commits.  How do you *start* writing a
  filesystem for Linux?