linux-kernel - Re: [PATCH -V6 17/26] richacl: Permission check algorithm

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Message-ID: <877h5j5nln.fsf@skywalker.in.ibm.com>
Date:	Thu, 08 Sep 2011 16:04:44 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	agruen@...nel.org, akpm@...ux-foundation.org, dhowells@...hat.com,
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -V6 17/26] richacl: Permission check algorithm

On Wed, 7 Sep 2011 17:50:22 -0400, "J. Bruce Fields" <bfields@...ldses.org> wrote:
> On Mon, Sep 05, 2011 at 10:55:39PM +0530, Aneesh Kumar K.V wrote:
> > From: Andreas Gruenbacher <agruen@...nel.org>
> > 
> > As in the standard POSIX file permission model, each process is the
> > owner, group, or other file class.  A process is
> > 
> >   - in the owner file class if it owns the file,
> >   - in the group file class if it is in the file's owning group or it
> >     matches any of the user or group entries, and
> >   - in the other file class otherwise.
> > 
> > Each file class is associated with a file mask.
> > 
> > A richacl grants a requested access if the NFSv4 acl in the richacl
> > grants the requested permissions (according to the NFSv4 permission
> > check algorithm) and the file mask that applies to the process includes
> > the requested permissions.
> 
> I assume that by default any ui normally recalculates an upper-bound
> mask automatically when you add an ace, as the posix setfacl does, so
> the user doesn't have to think about masks too much?
> 

yes. richacl userspace command does this.

-aneesh

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