This doesn't really help us all that much right now, but will be useful
for the future-planned block map and being able to cache pre-erased
blocks.
Though the lack of erasing when allocating new mdirs raises some
questions... Oh well, future problems.
Code changes:
code stack
before: 33856 2880
after: 33864 (+0.0%) 2880 (+0.0%)
Christopher Haster
5005db2b4e