linux-kernel - Re: [PATCH 2/2] devscgroup: make white list more compact in some cases

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Message-ID: <20080605191647.GA27304@us.ibm.com>
Date:	Thu, 5 Jun 2008 14:16:47 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	Pavel Emelyanov <xemul@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] devscgroup: make white list more compact in some
	cases

Quoting Serge E. Hallyn (serue@...ibm.com):
> Quoting Pavel Emelyanov (xemul@...nvz.org):
> > Consider you added a 'c foo:bar r' permission to some cgroup and then
> > (a bit later) 'c'foo:bar w' for it. After this you'll see a
> > c foo:bar r
> > c foo:bar w
> > lines in a devices.list file.
> > 
> > Another example - consider you added 10 'c foo:bar r' permissions to
> > some cgroup (e.g. by mistake). After this you'll see 10
> > c foo:bar r
> > lines in a list file.
> > 
> > This is weird. This situation also has one more annoying consequence. 
> > Having many items in a white list makes permissions checking slower, 
> > sine it has to walk a longer list.
> > 
> > The proposal is to merge permissions for items, that correspond to the
> > same device.
> > 
> > Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>
> 
> Acked-by: Serge Hallyn <serue@...ibm.com>
> 
> Thanks.  I suppose if it was deemed worth it, the other thing you could
> do would be to detect when you have a rule
> 
> 	c foo:bar r
> 
> and you add a rule
> 
> 	c foo:(all) r

But a private email response preferred the each-entry-is-separate
semantics, so I retract that suggestion.

-serge
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