> Correct, ffsv1 should supports filesystems with > 2^32 sectors
> provided the number of fragments is below 2^32 (or maybe 2^31).

Then there exists at least one bug. :-)  "My" filesystem has 4K frags,
which means its limit should be 16T (or maybe 8T).  It was well under
3T, and yet it had issues.  (FFSv1 works fine with sub-2T filesystems,
as far as I can tell, after applying the patch mycroft created back
when I reported the issues to the list.)

My first guess would be that the problem lies with code like
"fsbtodb(di->di_db[x])" which, because fsbtodb is a macro and thus does
not have the argument-promotion semantics of the function it looks
like, needs to be something more like
"fsbtodb((u_int64_t)di->di_db[x])" to make it 32-bit-clean.

I'm doing more tests.  But they're slow - slinging multiple terabytes
around is - so it'll be a while before I have any results.

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