From patchwork Mon Dec 18 15:11:53 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 10119899 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 3602A6019C for ; Mon, 18 Dec 2017 15:14:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 284FA28DE5 for ; Mon, 18 Dec 2017 15:14:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1D0D528E27; Mon, 18 Dec 2017 15:14:01 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable 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 C8F4328DE5 for ; Mon, 18 Dec 2017 15:14:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932936AbdLRPMo (ORCPT ); Mon, 18 Dec 2017 10:12:44 -0500 Received: from mail.kernel.org ([198.145.29.99]:55624 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932903AbdLRPMk (ORCPT ); Mon, 18 Dec 2017 10:12:40 -0500 Received: from tleilax.poochiereds.net (cpe-71-70-156-158.nc.res.rr.com [71.70.156.158]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D23FF21983; Mon, 18 Dec 2017 15:12:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D23FF21983 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=jlayton@kernel.org From: Jeff Layton To: linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk, linux-nfs@vger.kernel.org, bfields@fieldses.org, neilb@suse.de, jack@suse.de, linux-ext4@vger.kernel.org, tytso@mit.edu, adilger.kernel@dilger.ca, linux-xfs@vger.kernel.org, darrick.wong@oracle.com, david@fromorbit.com, linux-btrfs@vger.kernel.org, clm@fb.com, jbacik@fb.com, dsterba@suse.com, linux-integrity@vger.kernel.org, zohar@linux.vnet.ibm.com, dmitry.kasatkin@gmail.com, linux-afs@lists.infradead.org, dhowells@redhat.com, jaltman@auristor.com Subject: [PATCH v3 16/19] fs: only set S_VERSION when updating times if necessary Date: Mon, 18 Dec 2017 10:11:53 -0500 Message-Id: <20171218151156.14565-17-jlayton@kernel.org> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20171218151156.14565-1-jlayton@kernel.org> References: <20171218151156.14565-1-jlayton@kernel.org> 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 From: Jeff Layton 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 | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/fs/inode.c b/fs/inode.c index 03102d6ef044..83f6cfc3cde7 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -19,6 +19,7 @@ #include #include #include +#include #include "internal.h" /* @@ -1634,17 +1635,24 @@ 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 = false; - if (flags & S_ATIME) + if (flags & S_ATIME) { inode->i_atime = *time; + dirty |= !(inode->i_sb->s_flags & SB_LAZYTIME); + } if (flags & S_VERSION) - inode_inc_iversion(inode); - if (flags & S_CTIME) + dirty |= inode_maybe_inc_iversion(inode, dirty); + if (flags & S_CTIME) { inode->i_ctime = *time; - if (flags & S_MTIME) + dirty = true; + } + if (flags & S_MTIME) { inode->i_mtime = *time; + dirty = true; + } - if (!(inode->i_sb->s_flags & SB_LAZYTIME) || (flags & S_VERSION)) + if (dirty) iflags |= I_DIRTY_SYNC; __mark_inode_dirty(inode, iflags); return 0; @@ -1863,7 +1871,7 @@ 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)