quotaon fails - "Quota format not supported in kernel"

[Adam Rosi-Kessel <adam@rosi-kessel.org>]

I'm attempting to enable quotas on a Sarge system running a custom
2.6.17.3 kernel.

# grep -i quota /boot/config-`uname -r`
CONFIG_QUOTA=y
CONFIG_QUOTACTL=y

# quotaon -uv / 
quotaon: using //aquota.user on /dev/hda3 [/]: No such process
quotaon: Quota format not supported in kernel.

I've posted an strace of the quotaon command here:

http://adam.rosi-kessel.org/temp13/quotaon_strace

Running the quota init.d script fails similarly.

I'm not using any NFS mounts or exports.

Any ideas why this is failing?
-- 
Adam Rosi-Kessel
http://adam.rosi-kessel.org