Fixes unmount
On the kernel side, there are two changes. Functionally, we can handle
a null src_path. Code-wise, I renamed the variables to clarify what is
going on. Plan 9's 'old' and 'new' weren't very helpful. Additionally,
what the man pages call old and new were actually reversed when you get
to sysfile.c!
On the user side, cs wasn't calling the syscall properly, so it would
always fail. cs unmounts #s/cs from /net before it starts up, to make
sure that previous cs runs don't leave any lingering mounts. You
actually can restart cs &, then mount -a \#s/cs /net and be back in
business.
3 files changed
