netdev - Re: [PATCH v8 7/7] libceph: use sendpage_ok() in ceph_tcp

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Date:   Fri, 25 Sep 2020 11:13:53 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     Coly Li <colyli@...e.de>, linux-block@...r.kernel.org,
        linux-nvme@...ts.infradead.org, netdev@...r.kernel.org,
        open-iscsi@...glegroups.com, linux-scsi@...r.kernel.org,
        ceph-devel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Ilya Dryomov <idryomov@...il.com>
Subject: Re: [PATCH v8 7/7] libceph: use sendpage_ok() in ceph_tcp_sendpage()

On Fri, 2020-09-25 at 23:01 +0800, Coly Li wrote:
> In libceph, ceph_tcp_sendpage() does the following checks before handle
> the page by network layer's zero copy sendpage method,
> 	if (page_count(page) >= 1 && !PageSlab(page))
> 
> This check is exactly what sendpage_ok() does. This patch replace the
> open coded checks by sendpage_ok() as a code cleanup.
> 
> Signed-off-by: Coly Li <colyli@...e.de>
> Cc: Ilya Dryomov <idryomov@...il.com>
> Cc: Jeff Layton <jlayton@...nel.org>
> ---
>  net/ceph/messenger.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
> index bdfd66ba3843..d4d7a0e52491 100644
> --- a/net/ceph/messenger.c
> +++ b/net/ceph/messenger.c
> @@ -575,7 +575,7 @@ static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
>  	 * coalescing neighboring slab objects into a single frag which
>  	 * triggers one of hardened usercopy checks.
>  	 */
> -	if (page_count(page) >= 1 && !PageSlab(page))
> +	if (sendpage_ok(page))
>  		sendpage = sock->ops->sendpage;
>  	else
>  		sendpage = sock_no_sendpage;

Looks like a reasonable change to make. Assuming that there is no
objection to the new helper:

Acked-by: Jeff Layton <jlayton@...nel.org>