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 24535C4167B for ; Tue, 5 Dec 2023 02:54:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229677AbjLECyp (ORCPT ); Mon, 4 Dec 2023 21:54:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56820 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346576AbjLECZJ (ORCPT ); Mon, 4 Dec 2023 21:25:09 -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 9AFBC10F9; Mon, 4 Dec 2023 18:24:39 -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=Bt9k2tZgpXVg03EVTq0I8WE1O0 vQO825s7Z3TgdgUtIO0IW5DOlZ+UWldUhgjCjonyZlXrrijRzzcgKDHyxXdqqbPuR+cqsbnjqMUTF zO6QZJiB4DGodMoXD8eqNTduyCa9qWqyRUfFhD+swITRozjThpiGjuG1C0s3XLDd8hlbmr1iVKEe4 YkrgQqDmTZpVOPP+/HtWloG0pRw/scLrl/fQRXywmKkJtAcGxuGxA5v0wGAqoH2SslJrDTBq8MVD+ zBSjDETBAjE+LEsGXsjebXX6v4XWbK7jXkV4r2NEK4o5uNWhGnezo9OqYtB6dzNGgsVUVr0LyYysO dp2Kj+Pg==; Received: from viro by zeniv.linux.org.uk with local (Exim 4.96 #2 (Red Hat Linux)) id 1rAL6g-007920-2L; Tue, 05 Dec 2023 02:24:18 +0000 From: Al Viro To: linux-arch@vger.kernel.org Cc: gus Gusenleitner Klaus , Al Viro , Thomas Gleixner , lkml , Ingo Molnar , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "x86@kernel.org" , "David S. Miller" , "dsahern@kernel.org" , "kuba@kernel.org" , Paolo Abeni , Eric Dumazet Subject: [PATCH v2 1/9] reiserfs: Avoid touching renamed directory if parent does not change Date: Tue, 5 Dec 2023 02:23:53 +0000 Message-Id: <20231205022418.1703007-2-viro@zeniv.linux.org.uk> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231205022418.1703007-1-viro@zeniv.linux.org.uk> References: <20231205022100.GB1674809@ZenIV> <20231205022418.1703007-1-viro@zeniv.linux.org.uk> 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