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Date:	Mon, 19 Oct 2015 17:34:54 +0200
From:	Andreas Gruenbacher <>
To:	Austin S Hemmelgarn <>
Cc:	Alexander Viro <>,
	"Theodore Ts'o" <>,
	Andreas Dilger <>,
	"J. Bruce Fields" <>,
	Jeff Layton <>,
	Trond Myklebust <>,
	Anna Schumaker <>,
	Dave Chinner <>,
	linux-ext4 <>,,
	LKML <>,
	linux-fsdevel <>,
	Linux NFS Mailing List <>,, Linux API <>,
	"Aneesh Kumar K.V" <>
Subject: Re: [PATCH v11 21/48] ext4: Add richacl feature flag

On Mon, Oct 19, 2015 at 3:16 PM, Austin S Hemmelgarn
<> wrote:
> On 2015-10-16 13:41, Andreas Gruenbacher wrote:
>> On Fri, Oct 16, 2015 at 7:31 PM, Austin S Hemmelgarn
>> <> 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.
> OK, seeing as I wasn't particularly clear as to why I object to this in my
> other e-mail, let's try this again.
> Can you please explain exactly why it isn't safe to make such a filesystem
> accessible to other users?

See here:

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