nvme: factor out a add nvme_is_write helper
Centralize the check if a given NVMe command reads or writes data. Reviewed-by: NSagi Grimberg <sagi@grimberg.me> Reviewed-by: NJay Freyensee <james.p.freyensee@intel.com> Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NKeith Busch <keith.busch@intel.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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