From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wu Fengguang Subject: [PATCH 05/13] writeback: fix queue_io() ordering Date: Fri, 06 Aug 2010 00:10:56 +0800 Message-ID: <20100805162433.390104073@intel.com> References: <20100805161051.501816677@intel.com> Return-path: Received: from kanga.kvack.org ([205.233.56.17]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Oh3KF-0003He-TE for glkm-linux-mm-2@m.gmane.org; Thu, 05 Aug 2010 18:29:48 +0200 Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with SMTP id E92B26B02BA for ; Thu, 5 Aug 2010 12:28:55 -0400 (EDT) Content-Disposition: inline; filename=queue_io-fix.patch Sender: owner-linux-mm@kvack.org To: Andrew Morton Cc: Wu Fengguang , LKML , Dave Chinner , Martin Bligh , Michael Rubin , Peter Zijlstra , Christoph Hellwig , Mel Gorman , Chris Mason , Jens Axboe , Jan Kara , Peter Zijlstra , "linux-fsdevel@vger.kernel.org" , "linux-mm@kvack.org" List-Id: linux-mm.kvack.org This was not a bug, since b_io is empty for kupdate writeback. The next patch will do requeue_io() for non-kupdate writeback, so let's fix it. CC: Dave Chinner Cc: Martin Bligh Cc: Michael Rubin Cc: Peter Zijlstra Signed-off-by: Wu Fengguang --- fs/fs-writeback.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) --- linux-next.orig/fs/fs-writeback.c 2010-08-05 23:03:37.000000000 +0800 +++ linux-next/fs/fs-writeback.c 2010-08-05 23:21:43.000000000 +0800 @@ -253,10 +253,18 @@ static void move_expired_inodes(struct l /* * Queue all expired dirty inodes for io, eldest first. + * Before + * newly dirtied b_dirty b_io b_more_io + * =============> gf edc BA + * After + * newly dirtied b_dirty b_io b_more_io + * =============> g fBAedc + * | + * +--> dequeue for IO */ static void queue_io(struct bdi_writeback *wb, unsigned long *older_than_this) { - list_splice_init(&wb->b_more_io, wb->b_io.prev); + list_splice_init(&wb->b_more_io, &wb->b_io); move_expired_inodes(&wb->b_dirty, &wb->b_io, older_than_this); } -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org