wip implementation of unmounting and dirty bits for redoxfs

3 jobs from master in 2 minutes and 25 seconds (queued for 1 minute and 47 seconds)
Status Job ID Name Coverage
  Build
passed #6067
build:linux:cargo

01:02

passed #6068
build:redox:cargo

00:44

 
  Test
passed #6069
test:linux:cargo

00:38