nvme-pci: split metadata handling from nvme_map_data / nvme_unmap_data
This prepares for some bigger changes to the data mapping helpers. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
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