fragstoblks()
blkstofrags()
fragnum()
blknum()
to finish the job of distinguishing them from the lfs versions, which
Christos renamed the other day.
I believe this is the last of the overtly ambiguous exported symbols
from ffs... or at least, the last of the ones that conflicted with lfs.
ffs still pollutes the C namespace very broadly (as does ufs) and this
needs quite a bit more cleanup.
XXX: boo on macros with lowercase names. But I'm not tackling that just yet.
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