From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B11EAC433E5 for ; Sun, 26 Jul 2020 13:52:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 917E3206E3 for ; Sun, 26 Jul 2020 13:52:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727113AbgGZNwh (ORCPT ); Sun, 26 Jul 2020 09:52:37 -0400 Received: from mx2.suse.de ([195.135.220.15]:40794 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725848AbgGZNwh (ORCPT ); Sun, 26 Jul 2020 09:52:37 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id D92DDB64B; Sun, 26 Jul 2020 13:52:44 +0000 (UTC) From: Coly Li To: sagi@grimberg.me, philipp.reisner@linbit.com, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, hch@lst.de Cc: Coly Li Subject: [PATCH 2/2] drbd: code cleanup by using sendpage_ok() to check page for kernel_sendpage() Date: Sun, 26 Jul 2020 21:52:24 +0800 Message-Id: <20200726135224.107516-2-colyli@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200726135224.107516-1-colyli@suse.de> References: <20200726135224.107516-1-colyli@suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-bcache-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bcache@vger.kernel.org In _drbd_send_page() a page is checked by following code before sending it by kernel_sendpage(), (page_count(page) < 1) || PageSlab(page) If the check is true, this page won't be send by kernel_sendpage() and handled by sock_no_sendpage(). This kind of check is exactly what macro sendpage_ok() does, which is introduced into include/linux/net.h to solve a similar send page issue in nvme-tcp code. This patch uses macro sendpage_ok() to replace the open coded checks to page type and refcount in _drbd_send_page(), as a code cleanup. Signed-off-by: Coly Li Cc: Philipp Reisner Cc: Sagi Grimberg --- drivers/block/drbd/drbd_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index 45fbd526c453..567d7e1d9f76 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -1552,7 +1552,7 @@ static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *pa * put_page(); and would cause either a VM_BUG directly, or * __page_cache_release a page that would actually still be referenced * by someone, leading to some obscure delayed Oops somewhere else. */ - if (drbd_disable_sendpage || (page_count(page) < 1) || PageSlab(page)) + if (drbd_disable_sendpage || !sendpage_ok(page)) return _drbd_no_send_page(peer_device, page, offset, size, msg_flags); msg_flags |= MSG_NOSIGNAL; -- 2.26.2