From patchwork Wed Dec 21 17:03:43 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 9483339 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 EC5BD60290 for ; Wed, 21 Dec 2016 17:06:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D7A5328473 for ; Wed, 21 Dec 2016 17:06:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CC6B028458; Wed, 21 Dec 2016 17:06:20 +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 7BDCD28473 for ; Wed, 21 Dec 2016 17:06:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965149AbcLURFp (ORCPT ); Wed, 21 Dec 2016 12:05:45 -0500 Received: from mx1.redhat.com ([209.132.183.28]:46854 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964921AbcLUREO (ORCPT ); Wed, 21 Dec 2016 12:04:14 -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 5FC4261B92; Wed, 21 Dec 2016 17:04:13 +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 uBLH3l61022318; Wed, 21 Dec 2016 12:04:12 -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 26/30] fs: only set S_VERSION when updating times if it has been queried Date: Wed, 21 Dec 2016 12:03:43 -0500 Message-Id: <1482339827-7882-27-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 [10.5.110.39]); Wed, 21 Dec 2016 17:04:13 +0000 (UTC) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We only really need to update i_version if someone has queried for it since we last incremented it. By doing that, we can avoid having to update the inode if the times haven't changed. If the times have changed, then we go ahead and forcibly increment the counter, under the assumption that we'll be going to the storage anyway, and the increment itself is relatively cheap. Signed-off-by: Jeff Layton --- fs/inode.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/fs/inode.c b/fs/inode.c index 2484d91ae8ef..584516a32905 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -1621,17 +1621,18 @@ static int relatime_need_update(const struct path *path, struct inode *inode, int generic_update_time(struct inode *inode, struct timespec *time, int flags) { int iflags = I_DIRTY_TIME; + bool dirty = flags & ~S_VERSION; if (flags & S_ATIME) inode->i_atime = *time; - if (flags & S_VERSION) - inode_inc_iversion(inode, true); if (flags & S_CTIME) inode->i_ctime = *time; if (flags & S_MTIME) inode->i_mtime = *time; + if (flags & S_VERSION) + dirty |= inode_inc_iversion(inode, dirty); - if (!(inode->i_sb->s_flags & MS_LAZYTIME) || (flags & S_VERSION)) + if (dirty || !(inode->i_sb->s_flags & MS_LAZYTIME)) iflags |= I_DIRTY_SYNC; __mark_inode_dirty(inode, iflags); return 0; @@ -1850,7 +1851,7 @@ int file_update_time(struct file *file) if (!timespec_equal(&inode->i_ctime, &now)) sync_it |= S_CTIME; - if (IS_I_VERSION(inode)) + if (IS_I_VERSION(inode) && inode_iversion_need_inc(inode)) sync_it |= S_VERSION; if (!sync_it)