linux-kernel - Re: [RFC PATCH] vfs: add MNT

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Message-Id: <E1Nd6kb-000458-Ne@be1.7eggert.dyndns.org>
Date:	Thu, 04 Feb 2010 19:48:25 +0100
From:	Bodo Eggert <7eggert@....de>
To:	Miklos Szeredi <miklos@...redi.hu>, viro@...IV.linux.org.uk,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Eugene Teo <eugene@...hat.com>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [RFC PATCH] vfs: add MNT_NOFOLLOW flag to umount(2)

Miklos Szeredi <miklos@...redi.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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