From mboxrd@z Thu Jan 1 00:00:00 1970 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 645B9C2BB41 for ; Tue, 16 Aug 2022 13:15:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232624AbiHPNPk (ORCPT ); Tue, 16 Aug 2022 09:15:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45008 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232707AbiHPNP1 (ORCPT ); Tue, 16 Aug 2022 09:15:27 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B71AD57548; Tue, 16 Aug 2022 06:15:25 -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 dfw.source.kernel.org (Postfix) with ESMTPS id 5194661368; Tue, 16 Aug 2022 13:15:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 01CE6C433C1; Tue, 16 Aug 2022 13:15:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1660655724; bh=Qlz2w/t3WumkW2xfZEzx3Wd/O7+4juYNncaVGsC3Qng=; h=From:To:Cc:Subject:Date:From; b=S134L0uGqQgrZXlmQfSijzU5j11HNcYO/CAQKLZrxhdfiBw2LuAyclnWy8heBfMnE MVwydnK8SUqhatGeiwfW19HaFmiGW+wH0M1Lc63LHjrhQIxEQnUYilb/fcx3A/2bC1 NB8VI6BUmCAigAOan3cKtk+JpXhBM6MAmqIO0XM/Qi7zVPyPifJM9UjjCjtNVyCnAV Wsl2A/p53o6lOLmgPSR49AjUlxsGTRXhup7uShp8RRc/vti0xzM4F5mqpQefXctc6c 73StdCsc+CeDmCu96oiJf9rsQrcvS6V7Z9hNj899zetrIs4gEJZqgFKKQbUla+dWx+ 944vVodKSQAfA== From: Jeff Layton To: tytso@mit.edu, adilger.kernel@dilger.ca Cc: linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, Lukas Czerner , Jan Kara , Christian Brauner Subject: [PATCH] ext4: fix i_version handling in ext4 Date: Tue, 16 Aug 2022 09:15:22 -0400 Message-Id: <20220816131522.42467-1-jlayton@kernel.org> X-Mailer: git-send-email 2.37.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org ext4 currently updates the i_version counter when the atime is updated during a read. This is less than ideal as it can cause unnecessary cache invalidations with NFSv4. The increment in ext4_mark_iloc_dirty is also problematic since it can also corrupt the i_version counter for ea_inodes. We aren't bumping the file times in ext4_mark_iloc_dirty, so changing the i_version there seems wrong, and is the cause of both problems. Remove that callsite and add increments to the setattr and setxattr codepaths (at the same time that we update the ctime). The i_version bump that already happens during timestamp updates should take care of the rest. Cc: Lukas Czerner Cc: Jan Kara Cc: Christian Brauner Signed-off-by: Jeff Layton --- fs/ext4/inode.c | 10 +++++----- fs/ext4/xattr.c | 2 ++ 2 files changed, 7 insertions(+), 5 deletions(-) I think this patch should probably supersede Lukas' patch entitled: ext4: don't increase iversion counter for ea_inodes This will also mean that we'll need to respin the patch to turn on the i_version counter unconditionally in ext4 (though that should be trivial). diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 601214453c3a..a70921df89a5 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5342,6 +5342,7 @@ int ext4_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, int error, rc = 0; int orphan = 0; const unsigned int ia_valid = attr->ia_valid; + bool inc_ivers = IS_IVERSION(inode); if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) return -EIO; @@ -5425,8 +5426,8 @@ int ext4_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, return -EINVAL; } - if (IS_I_VERSION(inode) && attr->ia_size != inode->i_size) - inode_inc_iversion(inode); + if (attr->ia_size == inode->i_size) + inc_ivers = false; if (shrink) { if (ext4_should_order_data(inode)) { @@ -5528,6 +5529,8 @@ int ext4_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, } if (!error) { + if (inc_ivers) + inode_inc_iversion(inode); setattr_copy(mnt_userns, inode, attr); mark_inode_dirty(inode); } @@ -5731,9 +5734,6 @@ int ext4_mark_iloc_dirty(handle_t *handle, } ext4_fc_track_inode(handle, inode); - if (IS_I_VERSION(inode)) - inode_inc_iversion(inode); - /* the do_update_inode consumes one bh->b_count */ get_bh(iloc->bh); diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 533216e80fa2..4d84919d1c9c 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -2412,6 +2412,8 @@ ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, if (!error) { ext4_xattr_update_super_block(handle, inode->i_sb); inode->i_ctime = current_time(inode); + if (IS_IVERSION(inode)) + inode_inc_iversion(inode); if (!value) no_expand = 0; error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); -- 2.37.2