nvme: use the block layer for userspace passthrough metadata
Use the integrity API to pass through metadata from userspace. For PI enabled devices this means that we now validate the reftag, which seems like an unintentional ommission in the old code. Thanks to Keith Busch for testing and fixes. Signed-off-by: NChristoph Hellwig <hch@lst.de> [Skip metadata setup on admin commands] Signed-off-by: NKeith Busch <keith.busch@intel.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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