From: Andreas Gruenbacher <agruenba@redhat.com>
Subject: Re: [PATCH v11 21/48] ext4: Add richacl feature flag
Date: Fri, 16 Oct 2015 19:41:30 +0200
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Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
	"Theodore Ts'o" <tytso@mit.edu>,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	"J. Bruce Fields" <bfields@fieldses.org>,
	Jeff Layton <jlayton@poochiereds.net>,
	Trond Myklebust <trond.myklebust@primarydata.com>,
	Anna Schumaker <anna.schumaker@netapp.com>,
	Dave Chinner <david@fromorbit.com>,
	linux-ext4 <linux-ext4@vger.kernel.org>, xfs@oss.sgi.com,
	LKML <linux-kernel@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
	linux-cifs@vger.kernel.org, Linux API <linux-api@vger.kernel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: Austin S Hemmelgarn <ahferroin7@gmail.com>
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On Fri, Oct 16, 2015 at 7:31 PM, Austin S Hemmelgarn
<ahferroin7@gmail.com> wrote:
> I would like to re-iterate, on both XFS and ext4, I _really_ think this
> should be a ro_compat flag, and not an incompat one.  If a person has the
> ability to mount the FS (even if it's a read-only mount), then they by
> definition have read access to the file or partition that the filesystem is
> contained in, which means that any ACL's stored on the filesystem are
> functionally irrelevant,

It is unfortunately not safe to make such a file system accessible to
other users, so the feature is not strictly read-only compatible.

Andreas