From patchwork Fri Aug 26 21:47:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 12956651 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 383CDC0502E for ; Fri, 26 Aug 2022 21:47:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345175AbiHZVrv (ORCPT ); Fri, 26 Aug 2022 17:47:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52962 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345148AbiHZVrZ (ORCPT ); Fri, 26 Aug 2022 17:47:25 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EB322D0216; Fri, 26 Aug 2022 14:47:19 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id A3D2ECE312B; Fri, 26 Aug 2022 21:47:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id EB54EC433D6; Fri, 26 Aug 2022 21:47:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1661550435; bh=3NonU2GerMrPghH8DGEw5liykSCzElPuDvCptLZ61mI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P8Ibfp1lGyT4j3SfzJhYeRJ8QjoAXjKXdJDHFjIMuOgGhgHPxmaIZu/QUVjuf/pr4 LOA1O7PldD2eC3Av/Ltux4uQRjoJSIHX1Dhdr6ols5ZZpZ6Ih4+Q0XHobc4mH2VoeE fBEGMxNE/3M+SoweiYZYVHCEuD+CGSzC5L68rEwxZO5IrJ3RsxbqIHOSBEx+O9y920 AcoBAOhQE3BLY9bNwA2dgZO6tkwmEU44wHDolEGLZyv44VtA+MmM1Zq6O8n4/HZxAA 3fMULJvB+hc1HNPpapY+/RBKQwjDtd9jzjzQuK5iKHBih5L9mbmrE9S8x+9WtNJspy gaoOYxIKSFhHg== From: Jeff Layton To: tytso@mit.edu, adilger.kernel@dilger.ca, djwong@kernel.org, david@fromorbit.com, trondmy@hammerspace.com, neilb@suse.de, viro@zeniv.linux.org.uk, zohar@linux.ibm.com, xiubli@redhat.com, chuck.lever@oracle.com, lczerner@redhat.com, jack@suse.cz, brauner@kernel.org Cc: linux-api@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-ceph@vger.kernel.org, linux-ext4@vger.kernel.org, linux-nfs@vger.kernel.org, linux-xfs@vger.kernel.org, David Wysochanski Subject: [PATCH v3 4/7] xfs: don't bump the i_version on an atime update in xfs_vn_update_time Date: Fri, 26 Aug 2022 17:47:00 -0400 Message-Id: <20220826214703.134870-5-jlayton@kernel.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220826214703.134870-1-jlayton@kernel.org> References: <20220826214703.134870-1-jlayton@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org xfs will update the i_version when updating only the atime value, which is not desirable for any of the current consumers of i_version. Doing so leads to unnecessary cache invalidations on NFS and extra measurement activity in IMA. Add a new XFS_ILOG_NOIVER flag, and use that to indicate that the transaction should not update the i_version. Set that value in xfs_vn_update_time if we're only updating the atime. Cc: Dave Chinner Cc: NeilBrown Cc: Trond Myklebust Cc: David Wysochanski Signed-off-by: Jeff Layton --- fs/xfs/libxfs/xfs_log_format.h | 2 +- fs/xfs/libxfs/xfs_trans_inode.c | 2 +- fs/xfs/xfs_iops.c | 11 +++++++++-- 3 files changed, 11 insertions(+), 4 deletions(-) Dave has NACK'ed this patch, but I'm sending it as a way to illustrate the problem. I still think this approach should at least fix the worst problems with atime updates being counted. We can look to carve out other "spurious" i_version updates as we identify them. If however there are offline analysis tools that require atime updates to be counted, then we won't be able to do this. If that's the case, how can we fix this such that serving xfs via NFSv4 doesn't suck? diff --git a/fs/xfs/libxfs/xfs_log_format.h b/fs/xfs/libxfs/xfs_log_format.h index b351b9dc6561..866a4c5cf70c 100644 --- a/fs/xfs/libxfs/xfs_log_format.h +++ b/fs/xfs/libxfs/xfs_log_format.h @@ -323,7 +323,7 @@ struct xfs_inode_log_format_32 { #define XFS_ILOG_ABROOT 0x100 /* log i_af.i_broot */ #define XFS_ILOG_DOWNER 0x200 /* change the data fork owner on replay */ #define XFS_ILOG_AOWNER 0x400 /* change the attr fork owner on replay */ - +#define XFS_ILOG_NOIVER 0x800 /* don't bump i_version */ /* * The timestamps are dirty, but not necessarily anything else in the inode diff --git a/fs/xfs/libxfs/xfs_trans_inode.c b/fs/xfs/libxfs/xfs_trans_inode.c index 8b5547073379..ffe6d296e7f9 100644 --- a/fs/xfs/libxfs/xfs_trans_inode.c +++ b/fs/xfs/libxfs/xfs_trans_inode.c @@ -126,7 +126,7 @@ xfs_trans_log_inode( * unconditionally. */ if (!test_and_set_bit(XFS_LI_DIRTY, &iip->ili_item.li_flags)) { - if (IS_I_VERSION(inode) && + if (!(flags & XFS_ILOG_NOIVER) && IS_I_VERSION(inode) && inode_maybe_inc_iversion(inode, flags & XFS_ILOG_CORE)) iversion_flags = XFS_ILOG_CORE; } diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index 45518b8c613c..94f14d96641b 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -1041,10 +1041,17 @@ xfs_vn_update_time( return error; xfs_ilock(ip, XFS_ILOCK_EXCL); - if (flags & S_CTIME) + + if (!(flags & S_VERSION)) + log_flags |= XFS_ILOG_NOIVER; + if (flags & S_CTIME) { inode->i_ctime = *now; - if (flags & S_MTIME) + log_flags &= ~XFS_ILOG_NOIVER; + } + if (flags & S_MTIME) { inode->i_mtime = *now; + log_flags &= ~XFS_ILOG_NOIVER; + } if (flags & S_ATIME) inode->i_atime = *now;