Balloc.v: try to put Balloc on top of the log
Balloc.v: try to put Balloc on top of the log

new way of stating free_ok

new set of lemmas (surprisingly, simpler) to prove the new free_ok

mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl