Since the copy helpers now copy file attributes as well, let's not explicitly disable copy-on-write anymore when we copy an image. If the source already has copy-on-write disabled, the copy will have it disabled as well. Otherwise, the copy will also have copy-on-write enabled. This makes sure that reflinks always work as reflink is only supported if both source and target are copy-on-write or both source and target are not copy-on-write.
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