From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wanlong Gao Subject: Bug in BLKBSZSET/GET ioctl ? Date: Thu, 29 Dec 2011 11:51:45 +0800 Message-ID: <4EFBE3D1.5030608@cn.fujitsu.com> Reply-To: gaowanlong@cn.fujitsu.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: fengguang.wu@intel.com To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: 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 Sender: linux-fsdevel-owner@vger.kernel.org List-ID: 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