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