[PATCH v11 21/48] ext4: Add richacl feature flag

[Andreas Gruenbacher]

On Fri, Oct 16, 2015 at 7:31 PM, Austin S Hemmelgarn
<ahferroin7 at 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