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The local variable disk details is not used during the creating of thin & snap devices. Remove them from dm-thin-metadata, and add pointer validity check for pointer value in btree_lookup_raw. Skip memory copy when the caller doesn't need the value. Signed-off-by: Huaisheng Ye <yehs1@lenovo.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>