According to Stephen J. Turnbull:
>
>This is Linux-only?  On NetBSD it always shows zero used AFAICT.
>
>NetBSD 1.5.1alpha, fairly recent kernel from CVS, Coda client 5.3.15.
>

For me too (well, mine always look odd):

[blymn_at_rover] uname -a
NetBSD rover 1.5_ALPHA2 NetBSD 1.5_ALPHA2 (ROVER) #6: Mon Apr  9 21:17:07 CST 2001     toor_at_rover:/usr/src/sys/arch/i386/compile/ROVER i386
[blymn_at_rover] df
Filesystem  512-blocks     Used    Avail Capacity  Mounted on
/dev/wd0a     11884694  8239360  3051098    72%    /
kernfs               2        2        0   100%    /kern
procfs               8        8        0   100%    /proc
CODA         145454544        0 145454544     0%    /coda

I can check a -current kernel when I get home but last I looked it
looks like the above.  The client version would not matter in this
case if I understand things correctly....

-- 
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Brett Lymn, Computer Systems Administrator, BAE SYSTEMS
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