From b898320d683d54c2bc17b748b9742d2b601ad453 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@redhat.com>
Date: Fri, 27 Feb 2015 17:58:42 -0500
Subject: [PATCH] dm sysfs: introduce ability to add writable attributes

Add DM_ATTR_RW() macro and establish .store method in dm_sysfs_ops.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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