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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Add DM_ATTR_RW() macro and establish .store method in dm_sysfs_ops.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>