From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755833Ab3KAKNJ (ORCPT ); Fri, 1 Nov 2013 06:13:09 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:62260 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751371Ab3KAKNH (ORCPT ); Fri, 1 Nov 2013 06:13:07 -0400 X-IronPort-AV: E=Sophos;i="4.93,616,1378828800"; d="scan'208";a="8921337" Message-ID: <52737D46.1000202@cn.fujitsu.com> Date: Fri, 01 Nov 2013 18:07:02 +0800 From: Gu Zheng User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110930 Thunderbird/7.0.1 MIME-Version: 1.0 To: Al Viro CC: fsdevel , linux-kernel Subject: [PATCH] fs/buffer.c: exit if already confirmed page has dirty and writeback buffers X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/11/01 18:11:17, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/11/01 18:11:17, Serialize complete at 2013/11/01 18:11:17 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Stop the loop of iterating bh if we have confirmed page has dirty and writeback buffers. Signed-off-by: Gu Zheng --- fs/buffer.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/fs/buffer.c b/fs/buffer.c index 6024877..519cc5c 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -112,7 +112,7 @@ void buffer_check_dirty_writeback(struct page *page, *dirty = true; bh = bh->b_this_page; - } while (bh != head); + } while ((bh != head) && !(*writeback && *dirty)); } EXPORT_SYMBOL(buffer_check_dirty_writeback); -- 1.7.7