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Use block layer queues with an internal cmd_type to submit internally generated NVMe commands. This both simplifies the code a lot and allow for a better structure. For example now the LighNVM code can construct commands without knowing the details of the underlying I/O descriptors. Or a future NVMe over network target could inject commands, as well as could the SCSI translation and ioctl code be reused for such a beast. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>