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

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Date:	Tue, 23 Jun 2009 17:06:10 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	David Howells <dhowells@...hat.com>
Cc:	Miklos Szeredi <miklos@...redi.hu>, dhowells@...hat.com,
	hch@...radead.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	viro@...IV.linux.org.uk, adilger@....com, akpm@...ux-foundation.org
Subject: Re: [RFC] O_NOACC: open without any access

On Tue, 23 Jun 2009 16:52:17 +0100
David Howells <dhowells@...hat.com> wrote:

> Miklos Szeredi <miklos@...redi.hu> wrote:
> 
> > Right, but that makes it useless for things which want to open it
> > despite having no permission on the file.
> 
> For my purposes, if I'm going to emulate pioctl() in userspace, I also need to
> be able to open device files that don't have drivers available, and when you
> do open a dev file in this manner, it must _not_ call the ->open() routine of
> the device driver

So how are you going to make that work in conjunction with the in
progress work on doing stuff like revoke(), and with module reference
counting ?
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