> It's not applied to users who already have a quota entry. I know, thanks.
The problem is something completly different from what I thought.
The (Perl XS) code (mostly written by David Holland, thanks again) reads
qv.qv_grace = 0; /* XXX should be able to manipulate this */
What do I put in qv_grace if I want to keep the default/the old value?
Do I have to explicitly read the QUOTA_DEFAULTID entry/the user's entry?
