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

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Message-Id: <E1NdJKL-0003K8-S1@pomaz-ex.szeredi.hu>
Date:	Fri, 05 Feb 2010 09:14:09 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	7eggert@....de
CC:	miklos@...redi.hu, viro@...IV.linux.org.uk,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	eugene@...hat.com, mtk.manpages@...il.com
Subject: Re: [RFC PATCH] vfs: add MNT_NOFOLLOW flag to umount(2)

On Thu, 04 Feb 2010, Bodo Eggert wrote:
> 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.

It's difficult though, because the app would have to make sure the
detection itself would reliably fail, and with a different error.

Simply checking the kernel version might be easier.

Thanks,
Miklos
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