From: Bodo Eggert <7eggert@web.de>
Subject: Re: [RFC PATCH] vfs: add MNT_NOFOLLOW flag to umount(2)
To: Miklos Szeredi <miklos@szeredi.hu>, viro@ZenIV.linux.org.uk,
       linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
       Eugene Teo <eugene@redhat.com>,
       Michael Kerrisk <mtk.manpages@gmail.com>
Reply-To: 7eggert@gmx.de
Date: Thu, 04 Feb 2010 19:48:25 +0100
References: <eae9I-mz-1@gated-at.bofh.it>
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Miklos Szeredi <miklos@szeredi.hu> wrote:

> Additionally, return -EINVAL if an unknown flag is encountered.  This
> makes it possible for the caller to determine if a flag is supported
> or not (at least on kernels with this patch).

There should be a guaranteed-to-be-invalid flag or flag-combination in
order to safely detect this feature.

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