linux-kernel - Re: [PATCH 2/2] fs: Remove kiocb->ki

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Date:   Wed, 8 Jul 2020 21:25:03 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-aio@...ck.org, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, Kanchan Joshi <joshi.k@...sung.com>,
        Javier Gonzalez <javier.gonz@...sung.com>
Subject: Re: [PATCH 2/2] fs: Remove kiocb->ki_complete

On 7/8/20 4:26 PM, Matthew Wilcox (Oracle) wrote:
> +void unregister_kiocb_completion(int id)
> +{
> +	ki_cmpls[id - 1] = NULL;
> +}
> +EXPORT_SYMBOL(unregister_kiocb_completion);

This should have a limit check (<= 0 || > max).

>  void complete_kiocb(struct kiocb *iocb, long ret, long ret2)
>  {
> -	iocb->ki_complete(iocb, ret, ret2);
> +	unsigned int id = kiocb_completion_id(iocb);
> +
> +	if (id > 0)
> +		ki_cmpls[id - 1](iocb, ret, ret2);
>  }

I'd make id == 0 be a dummy funciton to avoid this branch.

-- 
Jens Axboe