Message-ID: <1329996416.25314.12.camel@perseus.themaw.net>
Subject: Re: compat: autofs v5 packet size ambiguity - update
From: Ian Kent <raven@themaw.net>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Meyer <thomas@m3y3r.de>, David Miller <davem@davemloft.net>,
        linux-kernel@vger.kernel.org, autofs@vger.kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 23 Feb 2012 19:26:56 +0800
In-Reply-To: <1329996024.25314.10.camel@perseus.themaw.net>
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	 <CA+55aFwvmZGDzO_8wwYfH8HsLE=qCmLkJfeMyCe4PVvOYbDMHQ@mail.gmail.com>
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On Thu, 2012-02-23 at 19:20 +0800, Ian Kent wrote:
> On Wed, 2012-02-22 at 22:31 -0800, H. Peter Anvin wrote:
> > However, I liked Linus' approach.of using the version ioctl; any reason not to?
> 
> Not really, although that ioctl is used it doesn't have to be but you
> must mount the autofs file system to use it. Setting a timeout is
> another ioctl that is almost mandatory although not using it amounts to
> saying you don't want anything to expire which is valid.

The open, to get an ioctl is another that pretty much must be done to
use the mount.

> 
> > 
> > Ian Kent <raven@themaw.net> wrote:
> > 
> > >On Thu, 2012-02-23 at 10:21 +0800, Ian Kent wrote:
> > >> On Thu, 2012-02-23 at 09:54 +0800, Ian Kent wrote:
> > >> > On Thu, 2012-02-23 at 09:48 +0800, Ian Kent wrote:
> > >> > > On Wed, 2012-02-22 at 08:12 -0800, Linus Torvalds wrote:
> > >> > > > On Wed, Feb 22, 2012 at 1:32 AM, Ian Kent <raven@themaw.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.
> > >> > 
> > >> > On second thought, I suppose other user space users don't "have" to
> > >use
> > >> > mount(2) ....
> > >> 
> > >> Thomas, what does systemd use to mount the autofs mounts that it
> > >uses?
> > >
> > >Mmm ... AFAICS systemd uses mount(2) so that looks OK too.
> > >
> > >Ian
> > 
> 


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