From patchwork Wed Dec 21 17:03:45 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 9483289 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A0100601B3 for ; Wed, 21 Dec 2016 17:05:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 89A45281A7 for ; Wed, 21 Dec 2016 17:05:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7DC4228424; Wed, 21 Dec 2016 17:05:08 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.4 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, SUSPICIOUS_RECIPS autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3291527C0B for ; Wed, 21 Dec 2016 17:05:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964982AbcLURET (ORCPT ); Wed, 21 Dec 2016 12:04:19 -0500 Received: from mx1.redhat.com ([209.132.183.28]:42180 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964943AbcLUREP (ORCPT ); Wed, 21 Dec 2016 12:04:15 -0500 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 47641D77EB; Wed, 21 Dec 2016 17:04:15 +0000 (UTC) Received: from tleilax.poochiereds.net (ovpn-118-75.rdu2.redhat.com [10.10.118.75]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id uBLH3l63022318; Wed, 21 Dec 2016 12:04:14 -0500 From: Jeff Layton To: linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-xfs@vger.kernel.org Subject: [RFC PATCH v1 28/30] btrfs: only dirty the inode in btrfs_update_time if something was changed Date: Wed, 21 Dec 2016 12:03:45 -0500 Message-Id: <1482339827-7882-29-git-send-email-jlayton@redhat.com> In-Reply-To: <1482339827-7882-1-git-send-email-jlayton@redhat.com> References: <1482339827-7882-1-git-send-email-jlayton@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Wed, 21 Dec 2016 17:04:15 +0000 (UTC) Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP At this point, we know that "now" and the file times may differ, and we suspect that the i_version has been flagged to be bumped. Attempt to bump the i_version, and only mark the inode dirty if that actually occurred or if one of the times was updated. Signed-off-by: Jeff Layton --- fs/btrfs/inode.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index a03e5a1d5e05..65a7065c0fbf 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -6025,19 +6025,20 @@ static int btrfs_update_time(struct inode *inode, struct timespec *now, int flags) { struct btrfs_root *root = BTRFS_I(inode)->root; + bool dirty = flags & ~S_VERSION; if (btrfs_root_readonly(root)) return -EROFS; if (flags & S_VERSION) - inode_inc_iversion(inode, true); + dirty |= inode_inc_iversion(inode, dirty); if (flags & S_CTIME) inode->i_ctime = *now; if (flags & S_MTIME) inode->i_mtime = *now; if (flags & S_ATIME) inode->i_atime = *now; - return btrfs_dirty_inode(inode); + return dirty ? btrfs_dirty_inode(inode) : 0; } /*