linux-kernel - Re: compat: autofs v5 packet size ambiguity

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Message-ID: <1329961703.2244.8.camel@perseus.themaw.net>
Date:	Thu, 23 Feb 2012 09:48:23 +0800
From:	Ian Kent <raven@...maw.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>, autofs@...r.kernel.org,
	Thomas Meyer <thomas@...3r.de>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: compat: autofs v5 packet size ambiguity - update

On Wed, 2012-02-22 at 08:12 -0800, Linus Torvalds wrote:
> On Wed, Feb 22, 2012 at 1:32 AM, Ian Kent <raven@...maw.net> wrote:
> >
> > Oh, DOH ...
> >
> > The process mounting the autofs mount is passing the pipe it will use
> > for communication via a mount option so we can do this right in
> > fill_super.
> 
> No, we really cannot.

Sorry, I think your wrong this time.

> 
> The autofs "mount" is done by fork + execve("mount").

It's done like this when mounting things inside an already mounted
indirect autofs mount or when mounting things on autofs direct mount
triggers but, in version 5, mount(2) has always used to mount autofs
file systems.

Ian

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