From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michal Soltys <soltys@ziu.info>
Date: Mon, 15 Dec 2008 11:35:00 +0000
Subject: Re: udev lvm permisions
Message-Id: <494640E4.6000005@ziu.info>
List-Id: <linux-hotplug.vger.kernel.org>
References: <1229336451.19633.4.camel@linux-pqqd.site>
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To: linux-hotplug@vger.kernel.org

Geert Geurts wrote:
> Hello,
> the permissions to the HomeVolume are not set correctly by Suse, so the
> volume cannot be decrypted and cannot be mounted.
> How can I create a udev rule that applies only to one LVM volume?
> 

You could match by NAME, for example something similar to:

KERNEL="dm*", ACTION="add|change", SUBSYSTEM="block", NAME="<name 
assigned earlier>", OWNER="<something>", GROUP="<something>", 
MODE=<something>

But for that to work, you need some earlier udev rule setting actual 
name - stock udev rules have no device-mapper rules. So it's up to your 
distro's rules or your own. Alternatively, you could just match by uuid:

ACTION!="add|change", GOTO="dm_end"
KERNEL!="dm*", GOTO="dm_end"

PROGRAM="/sbin/dmsetup info -c --noheadings -o uuid -j%M -m%m", 
ENV{DM_UUID}="%c"

ENV{DM_UUID}="<uuid of needed lvm volume>", OWNER=<something>, 
GROUP=<something>, MODE=<something>

LABEL="dm_end"

Then put it into some late-parsed udev rule. Note that uuid reported by 
dmsetup, will look like LVM-<vg uuid><lv uuid> without any dashes.