1. A method for re-establishing out-of-band metadata in a lower layer of a storage stack of a computer system, the storage stack comprising an upper layer and the lower layer, comprising: determining, by the upper layer, a probability that out-of-band metadata in the lower layer has become out of sync with the upper layer; determining, by the upper layer, based at least in part on the probability that out-of-band metadata in the lower layer has become out of sync, a set of metadata maintenance commands for the lower layer, wherein the set of metadata maintenance commands are sent independent of whether those commands have already been issued, and independent of whether a portion of the lower layer has become free; sending, by the upper layer, the set of metadata maintenance commands to the lower layer; and modifying, by the lower layer, at least one of the data and the metadata stored in the lower layer, in response to receiving the set of metadata maintenance commands.