linux-kernel - Re: [RFC] O_NOACC: open without any access

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Message-ID: <a36005b50906241002g7a116d17n52e6af2ff9891f87@mail.gmail.com>
Date:	Wed, 24 Jun 2009 10:02:04 -0700
From:	Ulrich Drepper <drepper@...il.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, viro@...iv.linux.org.uk,
	adilger@....com, dhowells@...hat.com, alan@...rguk.ukuu.org.uk,
	akpm@...ux-foundation.org
Subject: Re: [RFC] O_NOACC: open without any access

On Wed, Jun 17, 2009 at 23:55, Miklos Szeredi<miklos@...redi.hu> wrote:
> The sole purpose is to help race free "userspace lookup" type
> operations.  So fstat, fch*, *at work but nothing else.  Filesystem's
> ->open() is not called and f_op is set to NULL.

Before adding something like this, please look at the 2009 POSIX spec.
 There are two new open() flags which have to be implemented: O_EXEC
and O_SEARCH.  These might already suffice for what you want.
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