From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751467Ab1IZCZp (ORCPT ); Sun, 25 Sep 2011 22:25:45 -0400 Received: from mga01.intel.com ([192.55.52.88]:37059 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751280Ab1IZCZl (ORCPT ); Sun, 25 Sep 2011 22:25:41 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.68,441,1312182000"; d="scan'208";a="67383168" Subject: [patch]mm: add more blk plug From: Shaohua Li To: Jens Axboe Cc: Andrew Morton , Christoph Hellwig , lkml Content-Type: text/plain; charset="UTF-8" Date: Mon, 26 Sep 2011 10:30:26 +0800 Message-ID: <1317004226.29510.172.camel@sli10-conroe> Mime-Version: 1.0 X-Mailer: Evolution 2.32.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some filesystems implement .writepages. We don't have blk plug in such filesystems for .writepages. Signed-off-by: Shaohua Li diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 0e309cd..b9e73a1 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1253,13 +1253,16 @@ EXPORT_SYMBOL(generic_writepages); int do_writepages(struct address_space *mapping, struct writeback_control *wbc) { int ret; + struct blk_plug plug; if (wbc->nr_to_write <= 0) return 0; + blk_start_plug(&plug); if (mapping->a_ops->writepages) ret = mapping->a_ops->writepages(mapping, wbc); else ret = generic_writepages(mapping, wbc); + blk_finish_plug(&plug); return ret; }