Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1031591AbaGDW2l (ORCPT ); Fri, 4 Jul 2014 18:28:41 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:57696 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760768AbaGDWWp (ORCPT ); Fri, 4 Jul 2014 18:22:45 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jeff Mahoney , Jan Kara Subject: [PATCH 3.10 34/46] reiserfs: call truncate_setsize under tailpack mutex Date: Fri, 4 Jul 2014 15:19:38 -0700 Message-Id: <20140704221603.835590059@linuxfoundation.org> X-Mailer: git-send-email 2.0.1 In-Reply-To: <20140704221602.280733370@linuxfoundation.org> References: <20140704221602.280733370@linuxfoundation.org> User-Agent: quilt/0.63-1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jeff Mahoney commit 22e7478ddbcb670e33fab72d0bbe7c394c3a2c84 upstream. Prior to commit 0e4f6a791b1e (Fix reiserfs_file_release()), reiserfs truncates serialized on i_mutex. They mostly still do, with the exception of reiserfs_file_release. That blocks out other writers via the tailpack mutex and the inode openers counter adjusted in reiserfs_file_open. However, NFS will call reiserfs_setattr without having called ->open, so we end up with a race when nfs is calling ->setattr while another process is releasing the file. Ultimately, it triggers the BUG_ON(inode->i_size != new_file_size) check in maybe_indirect_to_direct. The solution is to pull the lock into reiserfs_setattr to encompass the truncate_setsize call as well. Signed-off-by: Jeff Mahoney Signed-off-by: Jan Kara Signed-off-by: Greg Kroah-Hartman --- fs/reiserfs/inode.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/fs/reiserfs/inode.c +++ b/fs/reiserfs/inode.c @@ -3211,8 +3211,14 @@ int reiserfs_setattr(struct dentry *dent attr->ia_size != i_size_read(inode)) { error = inode_newsize_ok(inode, attr->ia_size); if (!error) { + /* + * Could race against reiserfs_file_release + * if called from NFS, so take tailpack mutex. + */ + mutex_lock(&REISERFS_I(inode)->tailpack); truncate_setsize(inode, attr->ia_size); - reiserfs_vfs_truncate_file(inode); + reiserfs_truncate_file(inode, 1); + mutex_unlock(&REISERFS_I(inode)->tailpack); } } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/