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From: Herbert Poetzl (herbert_at_13thfloor.at)
Date: Thu 31 Oct 2002 - 14:26:15 GMT

On Thu, Oct 31, 2002 at 09:19:47AM -0500, Dave wrote:
> On Wed, 2002-10-30 at 21:03, Herbert Poetzl wrote:
> > >> IMHO, It should not be possible for a context to exceed it's quota when
> > >> some users have not. This is the point of quota mechanism. Guarantee
> > >> space on the disk and not allow for over-booking. Allocated user quota
> > >> should be subtracted from the total context quota, so that any users
> > >> with no quota should not be able to use that space. So in a way, users
> >
> > hmm, that might be the original idea of quota, but
> > all current implementations do not guarantee, but only
> > limit the maximum available resources ...
> >
> > if you want to guarantee, you then simply must do the
> > math an make sure that enough physical disk space is
> > available (or in the context case, the context quota
> > lies above the sum of all user quotas)
> If you do this, then the root user of the context will be able to raise
> its allocated quota as much as he likes, by just increasing the quota of
> any user he likes. The context quota will always be added to that.

as for now, I can ensure you, that the context quota
is a limit like the group or user quota, which will
not be added to some other quota information.

> The correct behavior should be to subtract any allocated quota from the
> allocated context quota.

If you want to see it this way. I prefer to see it
as being accounted independently (as the current
implementation does) so if an inode with uid/gid/ctx
is allocated or some inode is changed to another
uid/gid/ctx setting or an allocated inode is freed
the user/group/context quotas are adjusted accordingly
(not more not less)

> If you run a quotarep statistics on all users, you'll see at the bottom
> some summary showing you
> -) Total Available Stace
> -) Allocated Quota
> -) Quota left for allocation
> When you allocate quota to a user, that is subtracted from the quota
> left for allocation value. Am I missing something?
> So for Vserver to support quota "properly", you need to guarantee the
> space allocated to each context or accept the consequences (like I
> explained on another reply).

agreed again.

> Dave.


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