Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [PATCH 0/2] AFS metadata xattr fixes
To:     "David Howells (dhowells@redhat.com)" <dhowells@redhat.com>,
        linux-afs@lists.infradead.org
Cc:     Gaja Sophie Peters <gaja.peters@math.uni-hamburg.de>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
References: <161547181530.1868820.12933722592029066752.stgit@warthog.procyon.org.uk>
From:   Jeffrey E Altman <jaltman@auristor.com>
Organization: AuriStor, Inc.
Message-ID: <08de868e-d207-8980-1da4-da79eda07560@auristor.com>
Date:   Thu, 11 Mar 2021 09:54:47 -0500
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On 3/11/2021 9:10 AM, David Howells (dhowells@redhat.com) wrote:
> I wonder if it's better to just hide all the afs.* xattrs from listxatt=
r().
> It would probably be even better to not use xattrs for this, but I'm no=
t
> sure what I would use instead.

I believe that all of the "afs.*" xattrs should be hidden from=20
listxattr().  Any "afs.*" xattr that is read from an afs inode can be=20
copied to another filesystem and stored.  Attempts to set these values=20
in an afs volume will fail.

The use of xattrs is intended to be an alternative to the IBM/OpenAFS=20
pioctls which are accessed by processes such as "fs", "aklog", "tokens", =

etc which would know the names of the xattrs and how to use them.   Such =

tools would not require listxattr() to find them.

Thanks for the consideration.

Jeffrey Altman


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