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For some protocols like NVMe over Fabrics we need to be able to send initialization commands to a specific queue. Based on an earlier patch from Christoph Hellwig <hch@lst.de>. Signed-off-by: Ming Lin <ming.l@ssi.samsung.com> [hch: disallow sleeping allocation, req_op fixes] Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@fb.com>