determine ufs2 %fragmentation on mounted filesystem

[Nathan Kinkade]

Does anyone know of a way to determine the %fragmentation on a mounted
UFS2 filesystem?  An entry showed up in messages yesterday stating that
/usr has moved from time to space optimization yet the filesystem is
only at about 25% of it's capacity.  From what I can read it seems that
the kernel might also make this switch if fragmentation becomes
excessive.  However, this is a busy production machine running Squid, so
I can't conveniently umount /usr.

Thanks,
Nathan
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