From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753401Ab1L2Dwu (ORCPT ); Wed, 28 Dec 2011 22:52:50 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:55679 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752173Ab1L2Dwq (ORCPT ); Wed, 28 Dec 2011 22:52:46 -0500 Message-ID: <4EFBE3D1.5030608@cn.fujitsu.com> Date: Thu, 29 Dec 2011 11:51:45 +0800 From: Wanlong Gao Reply-To: gaowanlong@cn.fujitsu.com Organization: Fujitsu User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111222 Thunderbird/9.0 MIME-Version: 1.0 To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org CC: fengguang.wu@intel.com Subject: Bug in BLKBSZSET/GET ioctl ? X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-12-29 11:51:57, Serialize by Router on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-12-29 11:51:57, Serialize complete at 2011-12-29 11:51:57 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all: This is first reported to *libguestfs*: https://bugzilla.redhat.com/show_bug.cgi?id=624335 Then, I looked into upstream util-linux and it seems nothing wrong. I'm not convinced that it's a kernel bug. produce: --- # ./util-linux/disk-utils/blockdev --getbsz /dev/sda6 4096 # ./util-linux/disk-utils/blockdev --setbsz 2048 /dev/sda6 # ./util-linux/disk-utils/blockdev --getbsz /dev/sda6 4096 # ./util-linux/disk-utils/blockdev --setbsz 512 /dev/sda6 # ./util-linux/disk-utils/blockdev --getbsz /dev/sda6 4096 --- I'm not sure if it is related to write-back, but still CCed to Fengguang. Thanks, -Wanlong Gao