nvme: move block_device_operations and ns/ctrl freeing to common code
This moves the block_device_operations over to common code mostly as-is. The only change is that the ns and ctrl refcounting got some small refcounting to have wrappers around the kref_put operations. A new free_ctrl operation is added to allow the PCI driver to free it's ressources on the final drop. Signed-off-by: Christoph Hellwig <hch@lst.de> [Moved the integrity and pr changes due to merge conflict] Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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