From: Andreas Dilger Subject: Re: Ext3 onlie resize failure due to small journal size Date: Wed, 11 Jul 2007 11:38:21 -0600 Message-ID: <20070711173821.GA5495@schatzie.adilger.int> References: <4694E279.1060107@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: aneesh.kumar@linux.vnet.ibm.com, linux-ext4@vger.kernel.org, Amit K Arora , Mingming Cao To: Suzuki Return-path: Received: from 74-0-229-162.T1.lbdsl.net ([74.0.229.162]:46956 "EHLO mail.clusterfs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751413AbXGLFHo (ORCPT ); Thu, 12 Jul 2007 01:07:44 -0400 Content-Disposition: inline In-Reply-To: <4694E279.1060107@linux.vnet.ibm.com> Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Jul 11, 2007 19:30 +0530, Suzuki wrote: > Trying to resize a mounted ext3 filesystem fails due to small journal size. > > Background : > > The filesystem was created with default values, except blocksize = 4K on > a LV partition. Later we tried extended the partition to +16M and tried > to resize the fs using resize2fs, while it was mounted. > > While adding the new blockgroup, inside setup_new_group_blocks() we hit > the limit because we are requesting for a a credit value of 2 + > sbi->s_itb_per_group which in the case of the file system below is 1026 > while the max_transaction credits possible is 1024 for the fs. > > journal->j_maxlen = inode->i_size / blocksize = 16M/4K = 4K > > journal->j_max_transaction_buffers = journal->j_maxlen / 4 = 1K > > journal->j_max_transaction_buffers = 1024. > > Is this a supported operation ? If yes, what could be the best way to > fix it ? > > Resizing the journal is not supported at the moment :(. You can't do a journal resize online, but you can wait until your next outage and resize the journal at that time. Even a few extra blocks would be enough. I guess this is a corner case that hasn't been hit before. It might make sense to have the ext2fs_figure_journal_size() take this into account when making the filesystem? Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc.