From patchwork Sat Aug 15 12:42:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Coly Li X-Patchwork-Id: 11715841 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 71F1B14F6 for ; Sat, 15 Aug 2020 22:13:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 577E120639 for ; Sat, 15 Aug 2020 22:13:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728890AbgHOWNo (ORCPT ); Sat, 15 Aug 2020 18:13:44 -0400 Received: from mx2.suse.de ([195.135.220.15]:36276 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728435AbgHOWNo (ORCPT ); Sat, 15 Aug 2020 18:13:44 -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 EBD8AB1BE; Sat, 15 Aug 2020 12:43:32 +0000 (UTC) From: colyli@suse.de To: linux-block@vger.kernel.org, linux-nvme@lists.infradead.org Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Coly Li , Philipp Reisner , Sagi Grimberg Subject: [PATCH v4 3/3] drbd: code cleanup by using sendpage_ok() to check page for kernel_sendpage() Date: Sat, 15 Aug 2020 20:42:54 +0800 Message-Id: <20200815124254.115076-3-colyli@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200815124254.115076-1-colyli@suse.de> References: <20200815124254.115076-1-colyli@suse.de> MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Coly Li 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 --- Changelog: v3, introduce a more common sendpage_ok() v2, fix typo in patch subject v1, the initial version. 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 cb687ccdbd96..55dc0c91781e 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -1553,7 +1553,7 @@ 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;