[PATCH 2/2] lightnvm: enable metadata to be sent to device

Enable metadata to be sent to the device through the metadata field on the physical rw nvme command. When a single ppa is sent to the device, a 64-bit integer can be sent as metadata; when a ppa list is sent, a 64-bit integer list mapping to the ppa list can be used to send metadata.

[PATCH 2/2] lightnvm: enable metadata to be sent to device

Enable metadata to be sent to the device through the metadata field on the physical rw nvme command. When a single ppa is sent to the device, a 64-bit integer can be sent as metadata; when a ppa list is sent, a 64-bit integer list mapping to the ppa list can be used to send metadata.