Re: [PATCH v3 4/4] block: ublk_drv: Add a helper instead of casting

[Christoph Hellwig]

On Sun, Apr 30, 2023 at 07:35:32AM -0700, Breno Leitao wrote:
> ublk driver is using casts to get private data from uring cmd struct.
> Let's use a proper helper, as an interface that requires casts in all
> callers is one asking for bugs.
> 
> Suggested-by: Christoph Hellwig <hch@xxxxxx>

No, I've not suggested this.

> +static inline struct ublksrv_ctrl_cmd *ublk_uring_ctrl_cmd(
> +		struct io_uring_cmd *cmd)
> +{
> +	return (struct ublksrv_ctrl_cmd *)cmd->sqe->cmd;
> +}

I've two times explained we need a core io_uring helper to remove this
casting in the drivers, and I've explained how to do that and provided
the actual code for it.