linux-kernel - Re: [PATCH 3/4] autofs4 - track uid and gid of last mount requestor

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Date:	Wed, 27 Feb 2008 23:59:52 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Pavel Emelyanov <xemul@...nvz.org>
Cc:	Ian Kent <raven@...maw.net>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	autofs mailing list <autofs@...ux.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH 3/4] autofs4 - track uid and gid of last mount requestor

On Thu, 28 Feb 2008 10:51:08 +0300 Pavel Emelyanov <xemul@...nvz.org> wrote:

> > So, why do we need the uid and gid? When someone walks over an autofs
> > dentry that is meant to cause a mount we send a request packet to the
> > daemon via a pipe which includes the process uid and gid, and as part of
> > the lookup we set macros for several mount map substitution variables,
> > derived from the uid and gid of the process requesting the mount and
> > they can be used within autofs maps.
> 
> Why do we need the uid then? Is just pid not enough to uniquely 
> identify a task?

The problem is that the userspace daemon is restarted.  ie: it exits
and is re-run.  It then needs to pick up various state from its previous
run.
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