diff mbox series

[v8,7/7] libceph: use sendpage_ok() in ceph_tcp_sendpage()

Message ID 20200925150119.112016-8-colyli@suse.de (mailing list archive)
State New, archived
Headers show
Series Introduce sendpage_ok() to detect misused sendpage in network related drivers | expand

Commit Message

Coly Li Sept. 25, 2020, 3:01 p.m. UTC 
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@suse.de>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: Jeff Layton <jlayton@kernel.org>
---
 net/ceph/messenger.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Jeff Layton Sept. 25, 2020, 3:13 p.m. UTC | #1 
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@suse.de>
> Cc: Ilya Dryomov <idryomov@gmail.com>
> Cc: Jeff Layton <jlayton@kernel.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@kernel.org>
diff mbox series

Patch

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;