From patchwork Fri Aug 19 11:36:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 12948748 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 4FFE1C32771 for ; Fri, 19 Aug 2022 11:36:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348329AbiHSLg2 (ORCPT ); Fri, 19 Aug 2022 07:36:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42510 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347810AbiHSLg1 (ORCPT ); Fri, 19 Aug 2022 07:36:27 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 55B6BFBA44; Fri, 19 Aug 2022 04:36:24 -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 9B7E1617A5; Fri, 19 Aug 2022 11:36:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 26045C433D6; Fri, 19 Aug 2022 11:36:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1660908983; bh=61pC1LZYV2wv2vRQkL0OkPWqt2TK2A8MryhxdAKSASA=; h=From:To:Cc:Subject:Date:From; b=A4xAOx2avmL5yMb6/QRrjqEzKVxqz2Wfhla/kPFrVikOgaAFHPw3c64JxoR31lBg7 L6FSAC+dghOkIkQQiUeVBIeUt6XnG6IIKDYy2/WLvuP3CCGnrr+31xQw5bQd/8pbG8 KoPmeDU2TcKqFWVzQVmFs08qvG+T0fG1oef0zqPV/LVnHAcwUfRlo5wPuXA8JfqBdU K5vbPxj5fEnxiNCFMEWBgprlvROry0vs1AWweIO1wD15MSJ8YetnpWdCjPQzCypX8N Q9MP+a5Xhl03aY9OqqW8U0fWovskKxFW1gnpFxG7ghwVNqqP9t9DjppPBsLA2sR+q4 k39i2XZdY2dpQ== From: Jeff Layton To: tytso@mit.edu, adilger.kernel@dilger.ca Cc: linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-integrity@vger.kernel.org, Lukas Czerner , Jan Kara , Christian Brauner Subject: [PATCH] ext4: fix i_version handling in ext4 Date: Fri, 19 Aug 2022 07:36:20 -0400 Message-Id: <20220819113620.12048-1-jlayton@kernel.org> X-Mailer: git-send-email 2.37.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@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 and unnecessary remeasurements for IMA. 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, setxattr and ioctl 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. In ext4_move_extents, increment the i_version on both inodes, and also add in missing ctime updates. Cc: Lukas Czerner Reviewed-by: Jan Kara Reviewed-by: Christian Brauner (Microsoft) Signed-off-by: Jeff Layton --- fs/ext4/inode.c | 10 +++++----- fs/ext4/ioctl.c | 4 ++++ fs/ext4/move_extent.c | 6 ++++++ fs/ext4/xattr.c | 2 ++ 4 files changed, 17 insertions(+), 5 deletions(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 601214453c3a..aa37bce4c541 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_I_VERSION(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/ioctl.c b/fs/ext4/ioctl.c index 3cf3ec4b1c21..ad3a294a88eb 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -452,6 +452,7 @@ static long swap_inode_boot_loader(struct super_block *sb, swap_inode_data(inode, inode_bl); inode->i_ctime = inode_bl->i_ctime = current_time(inode); + inode_inc_iversion(inode); inode->i_generation = prandom_u32(); inode_bl->i_generation = prandom_u32(); @@ -665,6 +666,7 @@ static int ext4_ioctl_setflags(struct inode *inode, ext4_set_inode_flags(inode, false); inode->i_ctime = current_time(inode); + inode_inc_iversion(inode); err = ext4_mark_iloc_dirty(handle, inode, &iloc); flags_err: @@ -775,6 +777,7 @@ static int ext4_ioctl_setproject(struct inode *inode, __u32 projid) EXT4_I(inode)->i_projid = kprojid; inode->i_ctime = current_time(inode); + inode_inc_iversion(inode); out_dirty: rc = ext4_mark_iloc_dirty(handle, inode, &iloc); if (!err) @@ -1257,6 +1260,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) err = ext4_reserve_inode_write(handle, inode, &iloc); if (err == 0) { inode->i_ctime = current_time(inode); + inode_inc_iversion(inode); inode->i_generation = generation; err = ext4_mark_iloc_dirty(handle, inode, &iloc); } diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c index 701f1d6a217f..285700b00d38 100644 --- a/fs/ext4/move_extent.c +++ b/fs/ext4/move_extent.c @@ -6,6 +6,7 @@ */ #include +#include #include #include #include @@ -683,6 +684,11 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk, break; o_start += cur_len; d_start += cur_len; + + orig_inode->i_ctime = current_time(orig_inode); + donor_inode->i_ctime = current_time(donor_inode); + inode_inc_iversion(orig_inode); + inode_inc_iversion(donor_inode); } *moved_len = o_start - orig_blk; if (*moved_len > len) diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 533216e80fa2..e975442e4ab2 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_I_VERSION(inode)) + inode_inc_iversion(inode); if (!value) no_expand = 0; error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);