Date: Tue, 15 Mar 2016 17:05:26 -0400
From: "J. Bruce Fields" <bfields@fieldses.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: Andreas Gruenbacher <agruenba@redhat.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>, linux-nfs@vger.kernel.org,
        "Theodore Ts'o" <tytso@mit.edu>, linux-cifs@vger.kernel.org,
        linux-api@vger.kernel.org,
        Trond Myklebust <trond.myklebust@primarydata.com>,
        linux-kernel@vger.kernel.org, xfs@oss.sgi.com,
        Andreas Dilger <adilger.kernel@dilger.ca>,
        linux-fsdevel@vger.kernel.org, Jeff Layton <jlayton@poochiereds.net>,
        linux-ext4@vger.kernel.org, Anna Schumaker <anna.schumaker@netapp.com>
Subject: Re: [PATCH v18 19/22] richacl: Add richacl xattr handler
Message-ID: <20160315210526.GC3658@fieldses.org>
References: <1456733847-17982-1-git-send-email-agruenba@redhat.com>
 <1456733847-17982-20-git-send-email-agruenba@redhat.com>
 <20160311141735.GF14808@infradead.org>
 <20160311141905.GC13178@fieldses.org>
 <20160315071014.GB19747@infradead.org>
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Sender: linux-nfs-owner@vger.kernel.org

On Tue, Mar 15, 2016 at 12:10:14AM -0700, Christoph Hellwig wrote:
> On Fri, Mar 11, 2016 at 09:19:05AM -0500, J. Bruce Fields wrote:
> > On Fri, Mar 11, 2016 at 06:17:35AM -0800, Christoph Hellwig wrote:
> > > On Mon, Feb 29, 2016 at 09:17:24AM +0100, Andreas Gruenbacher wrote:
> > > > Add richacl xattr handler implementing the xattr operations based on the
> > > > get_richacl and set_richacl inode operations.
> > > 
> > > Given all the issues with Posix ACLs and selinux attributes these really
> > > should be proper syscalls instead of abusing the xattr interface.
> > 
> > What are those problems exactly?
> 
> That people get confused between the attr used by the xattr syscall
> interface and the attr used to store things on disk or the protocol.
> This has happened every time we have non-native support, e.g. XFS, NFS,
> CIFS, ntfs, etc.  And it's only going to become worse.

How has that confusion caused problems in practice?

--b.