filesystem fragmentation stats?

[Damian Menscher]

Let me preface this by saying "Yes, I know *nix filesystems don't need 
to worry about fragmentation".

That said, is there a way to check the overall level of fragmentation of 
a live ext3 filesystem?  I know about filefrag, but that's for specific 
files.  And I think e2fsck tells you, but only if you take the 
filesystem offline for the scan.  Is there anything that will give a 
percentage for a *live* filesystem?  (I have a fs that's been at >95% 
usage for quite some time, and I want to check for any fragmentation 
that could have resulted.)

Damian Menscher
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