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

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Date:	Thu, 23 Feb 2012 09:35:02 +0800
From:	Ian Kent <raven@...maw.net>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, 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 07:13 -0800, H. Peter Anvin wrote:
> On 02/22/2012 01:32 AM, Ian Kent 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.
> > 
> 
> Does that mean that the autofs v5 daemon calls mount() by itself, unlike
> the older autofs daemon?  Otherwise you're reading the compatness of
> /bin/mount...

Version 5 does, yes.

There was nothing to be gained by the extra overhead of calling mount(8)
since I wanted to minimize mtab usage and contention, and didn't want
these showing up in mtab either.

> 
> 	-hpa
> 


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