linux-kernel - Re: [PATCH 06/36] aio: delete iocbs from the active_reqs list in kiocb

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Message-ID: <20180320003456.GD7282@magnolia>
Date:   Mon, 19 Mar 2018 17:34:56 -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,
        netdev@...r.kernel.org, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/36] aio: delete iocbs from the active_reqs list in
 kiocb_cancel

On Mon, Mar 05, 2018 at 01:27:13PM -0800, Christoph Hellwig wrote:
> One we cancel an iocb there is no reason to keep it on the active_reqs
> list, given that the list is only used to look for cancelation candidates.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> Acked-by: Jeff Moyer <jmoyer@...hat.com>

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

--D

> ---
>  fs/aio.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/aio.c b/fs/aio.c
> index 2d40cf5dd4ec..0b6394b4e528 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -561,6 +561,8 @@ static int kiocb_cancel(struct aio_kiocb *kiocb)
>  {
>  	kiocb_cancel_fn *cancel = kiocb->ki_cancel;
>  
> +	list_del_init(&kiocb->ki_list);
> +
>  	if (!cancel)
>  		return -EINVAL;
>  	kiocb->ki_cancel = NULL;
> @@ -607,8 +609,6 @@ static void free_ioctx_users(struct percpu_ref *ref)
>  	while (!list_empty(&ctx->active_reqs)) {
>  		req = list_first_entry(&ctx->active_reqs,
>  				       struct aio_kiocb, ki_list);
> -
> -		list_del_init(&req->ki_list);
>  		kiocb_cancel(req);
>  	}
>  
> -- 
> 2.14.2
>