[PATCH 5/8] block: wire up support for file_operations->uring_cmd()

[Christoph Hellwig]

> +int blk_uring_cmd(struct block_device *bdev, struct io_uring_cmd *cmd,
> +		  enum io_uring_cmd_flags issue_flags)
> +{
> +	struct request_queue *q = bdev_get_queue(bdev);
> +
> +	if (!q->mq_ops || !q->mq_ops->uring_cmd)
> +		return -EOPNOTSUPP;
> +
> +	return q->mq_ops->uring_cmd(q, cmd, issue_flags);
> +}

This has absilutely not business in blk-mq.  It is a plain
block_device_operation that has nothing to do with requests or
blk-mq.