linux-kernel - Re: [PATCH -V7 21/26] richacl: xattr mapping functions

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Date:	Thu, 20 Oct 2011 14:00:02 +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,
	viro@...iv.linux.org.uk, dhowells@...hat.com,
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -V7 21/26] richacl: xattr mapping functions

On Wed, 19 Oct 2011 18:20:21 -0400, "J. Bruce Fields" <bfields@...ldses.org> wrote:
> On Tue, Oct 18, 2011 at 09:02:56PM +0530, Aneesh Kumar K.V wrote:
> > +#define RICHACL_XATTR "system.richacl"
> > +
> > +struct richace_xattr {
> > +	__le16		e_type;
> > +	__le16		e_flags;
> > +	__le32		e_mask;
> > +	__le32		e_id;
> > +	char		e_who[0];
> > +};
> 
> Does it really make sense to use a string here just to pick between the
> three choices OWNER@, GROUP@, and EVERYONE@?  Why not just another small
> integer?  Is the goal to expand this somehow eventually?

I guess Andreas wanted the disk layout to be able to store user@...ain
format if needed. That should make the layout flexible enough so that
we won't have to add another xattr later.

-aneesh
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