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Date: Mon, 21 Jul 2014 23:32:44 +0200
From: Bernhard Voelker <mail@bernhard-voelker.de>
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To: Benno Schulenberg <bensberg@justemail.net>, Karel Zak <kzak@redhat.com>
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        =?ISO-8859-1?Q?P=E1draig_Brady?= <P@draigbrady.com>
Subject: Re: mount.8: mtab as symlink
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On 07/21/2014 11:16 PM, Benno Schulenberg wrote:
> So how does umount determine that a device was mounted by a user
> and thus that the user is alllowed to unmount it again?

man sys-utils/mount.8  # the new one! ;-)

   user   Allow  an  ordinary user to mount the filesystem.
          The name of the mounting user is written to mtab
          (or to the private libmount file in /run/mount on
          system without regular mtab) so that he can unmount
          the filesystem again.

Have a nice day,
Berny