netdev - Re: [RFC PATCH] netlabel: Replace protocol/NetLabel linking with refrerence counts

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Message-Id: <200808091542.28776.paul.moore@hp.com>
Date:	Sat, 9 Aug 2008 15:42:28 -0400
From:	Paul Moore <paul.moore@...com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	netdev@...r.kernel.org, linux-security-module@...r.kernel.org,
	selinux@...ho.nsa.gov
Subject: Re: [RFC PATCH] netlabel: Replace protocol/NetLabel linking with refrerence counts

On Saturday 09 August 2008 1:08:40 pm Paul E. McKenney wrote:
> On Sat, Aug 09, 2008 at 10:43:22AM -0400, Paul Moore wrote:
> > NetLabel has always had a list of backpointers in the CIPSO DOI
> > definition structure which pointed to the NetLabel LSM domain
> > mapping structures which referenced the CIPSO DOI struct.  The
> > rationale for this was that when an administrator removed a CIPSO
> > DOI from the system all of the associated NetLabel LSM domain
> > mappings should be removed as well; a list of backpointers made
> > this a simple operation.
> >
> > Unfortunately, while the backpointers did make the removal easier
> > they were a bit of a mess from an implementation point of view
> > which was making further development difficult.  Since the removal
> > of a CIPSO DOI is a realtively rare event it seems to make sense to
> > remove this backpointer list as the optimization was hurting us
> > more then it was helping.  However, we still need to be able to
> > track when a CIPSO DOI definition is being used so replace the
> > backpointer list with a reference count.  In order to preserve the
> > current functionality of removing the associated LSM domain
> > mappings when a CIPSO DOI is removed we walk the LSM domain mapping
> > table, removing the relevant entries.
>
> Looks good from an RCU viewpoint!

Great, thanks for all your help :)

-- 
paul moore
linux @ hp
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