linux-kernel - Re: [patch v8 3/7] nbd: check sock index in nbd_read

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Date:   Thu, 23 Sep 2021 08:29:57 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Yu Kuai <yukuai3@...wei.com>
Cc:     josef@...icpanda.com, axboe@...nel.dk, hch@...radead.org,
        linux-block@...r.kernel.org, nbd@...er.debian.org,
        linux-kernel@...r.kernel.org, yi.zhang@...wei.com
Subject: Re: [patch v8 3/7] nbd: check sock index in nbd_read_stat()

On Thu, Sep 16, 2021 at 05:33:46PM +0800, Yu Kuai wrote:
> The sock that clent send request in nbd_send_cmd() and receive reply
> in nbd_read_stat() should be the same.
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> ---
>  drivers/block/nbd.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
> index 614c6ab2b8fe..c724a5bd7fa4 100644
> --- a/drivers/block/nbd.c
> +++ b/drivers/block/nbd.c
> @@ -746,6 +746,10 @@ static struct nbd_cmd *nbd_read_stat(struct nbd_device *nbd, int index)
>  		ret = -ENOENT;
>  		goto out;
>  	}
> +	if (cmd->index != index) {
> +		dev_err(disk_to_dev(nbd->disk), "Unexpected reply %d from different sock %d (expected %d)",
> +			tag, index, cmd->index);
> +	}
>  	if (cmd->cmd_cookie != nbd_handle_to_cookie(handle)) {
>  		dev_err(disk_to_dev(nbd->disk), "Double reply on req %p, cmd_cookie %u, handle cookie %u\n",
>  			req, cmd->cmd_cookie, nbd_handle_to_cookie(handle));
> -- 
> 2.31.1
> 

Reviewed-by: Ming Lei <ming.lei@...hat.com>

-- 
Ming