Make buildworld failure...no inodes free! Do I have to pay?

[keith at smmc.qld.edu.au]

Hi all,
Damn mbworld failed.
I did note that after dropping to su mode fsck -p did not much more than
reports
/dev/ad0s1a :NO WRITE ACCESS
/dev/ad0s1A :UNEXPECTED INCONSISTENCY ;RUN FSCK MANUALLY

Then the script from makebuild showed up
usr : create/symlink failed, no inodes free
Then the wheels fell of the wagon!

I tried fsck / but NO WRITE still
I tried mount -a /
then fsck /
But no dice...
If only I knew what the... I was doing.
Help required and gratefully acknowledged

Keith