From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:57316 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727076AbeI0Pvc (ORCPT ); Thu, 27 Sep 2018 11:51:32 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Li Dongyang , Theodore Tso , Andreas Dilger Subject: [PATCH 4.4 24/28] ext4: dont mark mmp buffer head dirty Date: Thu, 27 Sep 2018 11:06:48 +0200 Message-Id: <20180927090638.687796137@linuxfoundation.org> In-Reply-To: <20180927090637.687829444@linuxfoundation.org> References: <20180927090637.687829444@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Li Dongyang commit fe18d649891d813964d3aaeebad873f281627fbc upstream. Marking mmp bh dirty before writing it will make writeback pick up mmp block later and submit a write, we don't want the duplicate write as kmmpd thread should have full control of reading and writing the mmp block. Another reason is we will also have random I/O error on the writeback request when blk integrity is enabled, because kmmpd could modify the content of the mmp block(e.g. setting new seq and time) while the mmp block is under I/O requested by writeback. Signed-off-by: Li Dongyang Signed-off-by: Theodore Ts'o Reviewed-by: Andreas Dilger Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- fs/ext4/mmp.c | 1 - 1 file changed, 1 deletion(-) --- a/fs/ext4/mmp.c +++ b/fs/ext4/mmp.c @@ -48,7 +48,6 @@ static int write_mmp_block(struct super_ */ sb_start_write(sb); ext4_mmp_csum_set(sb, mmp); - mark_buffer_dirty(bh); lock_buffer(bh); bh->b_end_io = end_buffer_write_sync; get_bh(bh);