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From: Andrew Morton <akpm@linux-foundation.org>
To: Pavel Emelyanov <xemul@openvz.org>
Cc: Ian Kent <raven@themaw.net>,
	Kernel Mailing List <linux-kernel@vger.kernel.org>,
	autofs mailing list <autofs@linux.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [PATCH 3/4] autofs4 - track uid and gid of last mount requestor
Date: Wed, 27 Feb 2008 23:59:52 -0800	[thread overview]
Message-ID: <20080227235952.70a31d9f.akpm@linux-foundation.org> (raw)
In-Reply-To: <47C667EC.6060700@openvz.org>

On Thu, 28 Feb 2008 10:51:08 +0300 Pavel Emelyanov <xemul@openvz.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.

  reply	other threads:[~2008-02-28  8:00 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-26  3:21 [PATCH 0/4] autofs4 - autofs needs a miscelaneous device for ioctls Ian Kent
2008-02-26  3:22 ` [PATCH 1/4] autofs4 - check for invalid dentry in getpath Ian Kent
2008-02-26  3:23 ` [PATCH 3/4] autofs4 - track uid and gid of last mount requestor Ian Kent
2008-02-26  5:14   ` [PATCH 3/4] autofs4 - track uid and gid of last mount requestor - correction Ian Kent
2008-02-28  4:45   ` [PATCH 3/4] autofs4 - track uid and gid of last mount requestor Andrew Morton
2008-02-28  6:22     ` Ian Kent
2008-02-28  6:37       ` Andrew Morton
2008-02-28  7:08         ` Ian Kent
2008-02-28  7:23           ` Andrew Morton
2008-02-28  8:00             ` Ian Kent
2008-02-28 17:13               ` Jeff Moyer
2008-02-28 19:51                 ` Serge E. Hallyn
2008-02-29  3:32                   ` Ian Kent
2008-02-29 16:09                     ` Serge E. Hallyn
2008-02-29 16:20                       ` Pavel Emelyanov
2008-02-29 17:42                         ` Serge E. Hallyn
2008-03-02  0:49                       ` Eric W. Biederman
2008-03-02  1:13                       ` Eric W. Biederman
2008-03-03 15:28                         ` Serge E. Hallyn
2008-03-04 22:16                           ` Eric W. Biederman
2008-02-28  7:51           ` Pavel Emelyanov
2008-02-28  7:59             ` Andrew Morton [this message]
2008-02-28  8:06               ` Ian Kent
2008-02-28 12:31                 ` [autofs] " Fabio Olive Leite
2008-02-28 20:33             ` Eric W. Biederman
2008-02-26  3:23 ` [PATCH 4/4] autofs4 - add miscelaneous device for ioctls Ian Kent
2008-02-28  5:17   ` Andrew Morton
2008-02-28  6:18     ` Ian Kent
2008-03-13  7:00       ` [RFC] " Ian Kent
2008-03-14  2:45         ` Ian Kent
2008-03-14 12:45         ` Thomas Graf
2008-03-14 14:10           ` Ian Kent
2008-02-29 16:24     ` Ian Kent
2008-04-11  7:02       ` Ian Kent
2008-04-12  4:03         ` Andrew Morton
2008-04-14  4:45           ` Ian Kent
2008-02-26  4:29 ` [PATCH 2/4] autofs4 - add mount option to display mount device Ian Kent
2008-02-28  5:17   ` Andrew Morton
2008-02-28  4:40 ` [PATCH 0/4] autofs4 - autofs needs a miscelaneous device for ioctls Andrew Morton
2008-02-28  6:07   ` Ian Kent

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