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Date:   Mon, 1 May 2023 06:31:22 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Breno Leitao <leitao@debian.org>
Cc:     io-uring@vger.kernel.org, linux-nvme@lists.infradead.org,
        asml.silence@gmail.com, axboe@kernel.dk, ming.lei@redhat.com,
        leit@fb.com, linux-kernel@vger.kernel.org,
        linux-block@vger.kernel.org, sagi@grimberg.me, joshi.k@samsung.com,
        hch@lst.de, kbusch@kernel.org
Subject: Re: [PATCH v3 4/4] block: ublk_drv: Add a helper instead of casting
Message-ID: <20230501043122.GC19673@lst.de>
References: <20230430143532.605367-1-leitao@debian.org> <20230430143532.605367-5-leitao@debian.org>
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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@lst.de>

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.