linux-kernel - Re: [PATCH] vfs: new FROM

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Date:	Wed, 23 Sep 2009 09:48:16 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk
Subject: Re: [PATCH] vfs: new FROM_ACCESS flag

Christoph Hellwig wrote:
> On Tue, Sep 22, 2009 at 01:28:46PM -0400, Eric Paris wrote:
> > > only using MAY_ACCESS for calles from access() insteaf of introducing
> > > a FROM_ACCESS flag and causing lots of naming confusion.
> > 
> > What would you think of a new, MUST_REVALIDATE_PERMS which will do what
> > MAY_ACCESS does today.  MAY_ACCESS would be just for access(2) and would
> > be the flag that I use for SELinux?
> 
> Yeah, something like this.  I don't like the MUST_REVALIDATE_PERMS name
> too much, but unless someone comes up with a better one I can live with
> it.

MAY_ACCESS is used in only these places:

    - access/faccessat
    - chdir/fchdir
    - chroot

And it is checked in only two easy to change places: nfs/dir.c and
fuse/dir.c.

Therefore how about MAY_CHDIR.

-- Jamie
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