linux-kernel - Re: [PATCH 2/7] aio: remove an outdated BUG_ON and comment in aio

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Date:   Tue, 24 Apr 2018 14:27:57 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Christoph Hellwig <hch@....de>
Cc:     viro@...iv.linux.org.uk, Avi Kivity <avi@...lladb.com>,
        linux-aio@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-api@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] aio: remove an outdated BUG_ON and comment in
 aio_complete

On Sun, Apr 15, 2018 at 05:01:03PM +0200, Christoph Hellwig wrote:
> These days we don't treat sync iocbs special in the aio completion code as
> they never use it.  Remove the old comment and BUG_ON given that the
> current definition of is_sync_kiocb makes it impossible to hit.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Looks ok,
Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>

--D

> ---
>  fs/aio.c | 9 ---------
>  1 file changed, 9 deletions(-)
> 
> diff --git a/fs/aio.c b/fs/aio.c
> index add46b06be86..7c1855afd723 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -1107,15 +1107,6 @@ static void aio_complete(struct kiocb *kiocb, long res, long res2)
>  		file_end_write(file);
>  	}
>  
> -	/*
> -	 * Special case handling for sync iocbs:
> -	 *  - events go directly into the iocb for fast handling
> -	 *  - the sync task with the iocb in its stack holds the single iocb
> -	 *    ref, no other paths have a way to get another ref
> -	 *  - the sync task helpfully left a reference to itself in the iocb
> -	 */
> -	BUG_ON(is_sync_kiocb(kiocb));
> -
>  	if (iocb->ki_list.next) {
>  		unsigned long flags;
>  
> -- 
> 2.17.0
>