From 23d39f63aa87e812fd879b8bc32ee6ccfe733de3 Mon Sep 17 00:00:00 2001
From: Milan Broz <mbroz@redhat.com>
Date: Tue, 6 Jan 2009 03:05:04 +0000
Subject: [PATCH] dm ioctl: allow dm_copy_name_and_uuid to return only one
 field

Allow NULL buffer in dm_copy_name_and_uuid if you only want to return one of
the fields.

(Required by a following patch that adds these fields to sysfs.)

Signed-off-by: Milan Broz <mbroz@redhat.com>
Reviewed-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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