From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753881Ab3ITDGP (ORCPT ); Thu, 19 Sep 2013 23:06:15 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:41078 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752067Ab3ITDGO (ORCPT ); Thu, 19 Sep 2013 23:06:14 -0400 Date: Thu, 19 Sep 2013 20:06:02 -0700 From: "Darrick J. Wong" To: Kent Overstreet , Andrew Morton Cc: Mel Gorman , Jens Axboe , Jan Kara , Hannes Reinecke , linux-kernel@vger.kernel.org Subject: [PATCH] mm: Fix a regression where MS_SNAP_STABLE (stable pages snapshotting) was ignored Message-ID: <20130920030602.GC4565@birch.djwong.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Source-IP: acsinet21.oracle.com [141.146.126.237] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The "force" parameter in __blk_queue_bounce was being ignored, which means that stable page snapshots are not always happening (on ext3). This of course leads to DIF disks reporting checksum errors, so fix this regression. The regression was introduced in commit 6bc454d1 (bounce: Refactor __blk_queue_bounce to not use bi_io_vec) Reported-by: Mel Gorman Signed-off-by: Darrick J. Wong --- mm/bounce.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/bounce.c b/mm/bounce.c index c9f0a43..5a7d58f 100644 --- a/mm/bounce.c +++ b/mm/bounce.c @@ -204,6 +204,8 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig, struct bio_vec *to, *from; unsigned i; + if (force) + goto bounce; bio_for_each_segment(from, *bio_orig, i) if (page_to_pfn(from->bv_page) > queue_bounce_pfn(q)) goto bounce;