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 78F4BC61D9D for ; Wed, 22 Nov 2023 19:36:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344490AbjKVThA (ORCPT ); Wed, 22 Nov 2023 14:37:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40376 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343790AbjKVTg6 (ORCPT ); Wed, 22 Nov 2023 14:36:58 -0500 Received: from zeniv.linux.org.uk (zeniv.linux.org.uk [IPv6:2a03:a000:7:0:5054:ff:fe1c:15ff]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 989421A4; Wed, 22 Nov 2023 11:36:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=linux.org.uk; s=zeniv-20220401; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=BlfFBoYl8WljiWMPq8jOBx3qNB8G8Xt5J/at8Fwypa8=; b=K/Tc2GyYjNHRjlY66jCcTKv40h uI2eHqgIdzYpfZ8iPDPnzytxzUnw8C0mRdemI1USPVe0uuygI28Nzjm0arhCOluRn6lc6XrntEs5+ rUK7HHMr9xc2gQKMIhJ+WIuq8K8TBbFRtgMI45u6VyMP5TIWWxzdjA+r1X1NRGOpr5JpWWBdMa4ZW dJjn6DdaHNIs/wqMAfvUz9aa5VbLxEaeR18lZi+Q7x6NHo/YNOu9ArS3vGuSQTQXgsb7izY0ElA7v jLnL47vLk9zswGvFOm99fDOeT4GbsXJikaM48F7HxYvVntvW9MxwZJVQL6HePppULdL35ahLasKKf lFDbKPhw==; Received: from viro by zeniv.linux.org.uk with local (Exim 4.96 #2 (Red Hat Linux)) id 1r5t1o-001l1e-1Y; Wed, 22 Nov 2023 19:36:52 +0000 From: Al Viro To: linux-fsdevel@vger.kernel.org Cc: Linus Torvalds , Mo Zou , Jan Kara , linux-kernel@vger.kernel.org Subject: [PATCH 1/9] reiserfs: Avoid touching renamed directory if parent does not change Date: Wed, 22 Nov 2023 19:36:44 +0000 Message-Id: <20231122193652.419091-1-viro@zeniv.linux.org.uk> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231122193028.GE38156@ZenIV> References: <20231122193028.GE38156@ZenIV> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: Al Viro Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jan Kara The VFS will not be locking moved directory if its parent does not change. Change reiserfs rename code to avoid touching renamed directory if its parent does not change as without locking that can corrupt the filesystem. Signed-off-by: Jan Kara Signed-off-by: Al Viro --- fs/reiserfs/namei.c | 54 ++++++++++++++++++++++++--------------------- 1 file changed, 29 insertions(+), 25 deletions(-) diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c index 994d6e6995ab..5996197ba40c 100644 --- a/fs/reiserfs/namei.c +++ b/fs/reiserfs/namei.c @@ -1324,8 +1324,8 @@ static int reiserfs_rename(struct mnt_idmap *idmap, struct inode *old_inode, *new_dentry_inode; struct reiserfs_transaction_handle th; int jbegin_count; - umode_t old_inode_mode; unsigned long savelink = 1; + bool update_dir_parent = false; if (flags & ~RENAME_NOREPLACE) return -EINVAL; @@ -1375,8 +1375,7 @@ static int reiserfs_rename(struct mnt_idmap *idmap, return -ENOENT; } - old_inode_mode = old_inode->i_mode; - if (S_ISDIR(old_inode_mode)) { + if (S_ISDIR(old_inode->i_mode)) { /* * make sure that directory being renamed has correct ".." * and that its new parent directory has not too many links @@ -1389,24 +1388,28 @@ static int reiserfs_rename(struct mnt_idmap *idmap, } } - /* - * directory is renamed, its parent directory will be changed, - * so find ".." entry - */ - dot_dot_de.de_gen_number_bit_string = NULL; - retval = - reiserfs_find_entry(old_inode, "..", 2, &dot_dot_entry_path, + if (old_dir != new_dir) { + /* + * directory is renamed, its parent directory will be + * changed, so find ".." entry + */ + dot_dot_de.de_gen_number_bit_string = NULL; + retval = + reiserfs_find_entry(old_inode, "..", 2, + &dot_dot_entry_path, &dot_dot_de); - pathrelse(&dot_dot_entry_path); - if (retval != NAME_FOUND) { - reiserfs_write_unlock(old_dir->i_sb); - return -EIO; - } + pathrelse(&dot_dot_entry_path); + if (retval != NAME_FOUND) { + reiserfs_write_unlock(old_dir->i_sb); + return -EIO; + } - /* inode number of .. must equal old_dir->i_ino */ - if (dot_dot_de.de_objectid != old_dir->i_ino) { - reiserfs_write_unlock(old_dir->i_sb); - return -EIO; + /* inode number of .. must equal old_dir->i_ino */ + if (dot_dot_de.de_objectid != old_dir->i_ino) { + reiserfs_write_unlock(old_dir->i_sb); + return -EIO; + } + update_dir_parent = true; } } @@ -1486,7 +1489,7 @@ static int reiserfs_rename(struct mnt_idmap *idmap, reiserfs_prepare_for_journal(old_inode->i_sb, new_de.de_bh, 1); - if (S_ISDIR(old_inode->i_mode)) { + if (update_dir_parent) { if ((retval = search_by_entry_key(new_dir->i_sb, &dot_dot_de.de_entry_key, @@ -1534,14 +1537,14 @@ static int reiserfs_rename(struct mnt_idmap *idmap, new_de.de_bh); reiserfs_restore_prepared_buffer(old_inode->i_sb, old_de.de_bh); - if (S_ISDIR(old_inode_mode)) + if (update_dir_parent) reiserfs_restore_prepared_buffer(old_inode-> i_sb, dot_dot_de. de_bh); continue; } - if (S_ISDIR(old_inode_mode)) { + if (update_dir_parent) { if (item_moved(&dot_dot_ih, &dot_dot_entry_path) || !entry_points_to_object("..", 2, &dot_dot_de, old_dir)) { @@ -1559,7 +1562,7 @@ static int reiserfs_rename(struct mnt_idmap *idmap, } } - RFALSE(S_ISDIR(old_inode_mode) && + RFALSE(update_dir_parent && !buffer_journal_prepared(dot_dot_de.de_bh), ""); break; @@ -1592,11 +1595,12 @@ static int reiserfs_rename(struct mnt_idmap *idmap, savelink = new_dentry_inode->i_nlink; } - if (S_ISDIR(old_inode_mode)) { + if (update_dir_parent) { /* adjust ".." of renamed directory */ set_ino_in_dir_entry(&dot_dot_de, INODE_PKEY(new_dir)); journal_mark_dirty(&th, dot_dot_de.de_bh); - + } + if (S_ISDIR(old_inode->i_mode)) { /* * there (in new_dir) was no directory, so it got new link * (".." of renamed directory) -- 2.39.2