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

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Message-Id: <E1MJWrI-0002Bm-Bk@pomaz-ex.szeredi.hu>
Date:	Wed, 24 Jun 2009 20:06:08 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	drepper@...il.com
CC:	miklos@...redi.hu, 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, 24 Jun 2009, Ulrich Drepper wrote:
> 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.

Is it available online somewhere?  If not, could you please post the
relevant parts?

>  There are two new open() flags which have to be implemented: O_EXEC
> and O_SEARCH.  These might already suffice for what you want.

I suspect they are not quite what we want (both of them requring
MAY_EXEC on file, no?)

Thanks,
Miklos
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