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

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Message-ID: <16370.1245772337@redhat.com>
Date:	Tue, 23 Jun 2009 16:52:17 +0100
From:	David Howells <dhowells@...hat.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	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, alan@...rguk.ukuu.org.uk,
	akpm@...ux-foundation.org
Subject: Re: [RFC] O_NOACC: open without any access

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.

David
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