From patchwork Thu Apr 30 10:08:45 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anand Jain X-Patchwork-Id: 6301261 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id ED301BEEE5 for ; Thu, 30 Apr 2015 10:11:51 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 94DC3201F5 for ; Thu, 30 Apr 2015 10:11:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3CED4201F4 for ; Thu, 30 Apr 2015 10:11:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751247AbbD3KLk (ORCPT ); Thu, 30 Apr 2015 06:11:40 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:28157 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750887AbbD3KLj (ORCPT ); Thu, 30 Apr 2015 06:11:39 -0400 Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id t3UABb8F020776 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 30 Apr 2015 10:11:38 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserv0021.oracle.com (8.13.8/8.13.8) with ESMTP id t3UABbUj013213 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Thu, 30 Apr 2015 10:11:37 GMT Received: from abhmp0005.oracle.com (abhmp0005.oracle.com [141.146.116.11]) by userv0121.oracle.com (8.13.8/8.13.8) with ESMTP id t3UABaqx022456; Thu, 30 Apr 2015 10:11:37 GMT Received: from OL.sg.oracle.com (/10.186.101.34) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 30 Apr 2015 03:11:36 -0700 From: Anand Jain To: fstests@vger.kernel.org Cc: linux-btrfs@vger.kernel.org Subject: [PATCH 1/3] xfstests: btrfs: add functions to create dm-error device Date: Thu, 30 Apr 2015 18:08:45 +0800 Message-Id: <1430388527-16700-2-git-send-email-anand.jain@oracle.com> X-Mailer: git-send-email 2.0.0.153.g79dcccc In-Reply-To: <1430388527-16700-1-git-send-email-anand.jain@oracle.com> References: <1430388527-16700-1-git-send-email-anand.jain@oracle.com> X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Controlled EIO from the device is achieved using the dm device. Helper functions are at common/dmerror. Broadly steps will include calling _init_dm_error_dev() with a blk device as an argument, typically this device can be a device pealed from the SCRATCH_DEV_POOL, and init_dm_error_dev() will use this blk device as backing store of dm linear device and assign DM_ERROR_DEV to /dev/mapper/error-dev, which then can be assigned back to the SCRATCH_DEV_POOL. When test script is read to get EIO, the test cases can call _load_dm_error_table() which then it will load the dm error. so that reading DM_ERROR_DEV will cause EIO. After the test case is complete, cleanup must be done by calling _cleanup_dm_error_dev(). Signed-off-by: Anand Jain --- common/dmerror | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ common/rc | 18 ++++++++++++++++ 2 files changed, 83 insertions(+) create mode 100644 common/dmerror diff --git a/common/dmerror b/common/dmerror new file mode 100644 index 0000000..e1f92e6 --- /dev/null +++ b/common/dmerror @@ -0,0 +1,65 @@ +##/bin/bash +# +# Copyright (c) 2015 Oracle. All Rights Reserved. +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it would be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write the Free Software Foundation, +# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +# +# +# common functions for setting up and tearing down a dmerror device + +_init_dm_error_dev() +{ + DM_ERROR_DEV='' + $DMSETUP_PROG remove error-dev > /dev/null 2>&1 + DM_BLK_DEV=$1 + [ -b $DM_BLK_DEV ] || _fatal "$DM_BLK_DEV is not a block device" + + DM_DEV_SIZE=`blockdev --getsz $DM_BLK_DEV` + [ $? -ne 0 ] && _fatal "failed to failed to read block dev size" + + LINEAR_TABLE="0 $DM_DEV_SIZE linear $DM_BLK_DEV 0" + $DMSETUP_PROG create error-dev --table "$LINEAR_TABLE" || \ + _fatal "failed to create dm linear device" + + DM_ERROR_DEV='/dev/mapper/error-dev' + blockdev --setra 0 $DM_ERROR_DEV + [ $? -ne 0 ] && _fatal "failed to failed to setra for $DM_ERROR_DEV" +} + +_cleanup_dm_error_dev() +{ + DM_ERROR_DEV='' + $DMSETUP_PROG remove error-dev > /dev/null 2>&1 +} + +_load_dm_error_table() +{ + [ -z $DM_BLK_DEV ] && _fatal "DM_BLK_DEV is not set" + [ -z $DM_ERROR_DEV ] && _fatal "DM_ERROR_DEV is not set" + [ -z $DM_DEV_SIZE ] && _fatal "DM_DEV_SIZE is not set call init_error_dev first" + + echo 3 > /proc/sys/vm/drop_caches + $DMSETUP_PROG suspend error-dev + [ $? -ne 0 ] && _fatal "failed to suspend error-dev" + + ERROR_TABLE="0 $DM_DEV_SIZE error $DM_BLK_DEV 0" + $DMSETUP_PROG load error-dev --table "$ERROR_TABLE" + [ $? -ne 0 ] && _fatal "failed to load table into error-dev" + + $DMSETUP_PROG resume error-dev + [ $? -ne 0 ] && _fatal "failed to resume error-dev" + + dd if=$DM_ERROR_DEV of=/dev/null count=1 > /dev/null 2>&1 + [ $? -ne 0 ] || _fatal "failed to fail IO to $DM_ERROR_DEV" +} diff --git a/common/rc b/common/rc index c5db0dd..2a50491 100644 --- a/common/rc +++ b/common/rc @@ -1305,6 +1305,24 @@ _require_block_device() fi } +# this test requires the device mapper error target +# +_require_dm_error() +{ + DM_BACKSTORE_DEV=$1 + # require SCRATCH_DEV to be a valid block device + _require_block_device $DM_BACKSTORE_DEV + _require_command "$DMSETUP_PROG" dmsetup + + $DMSETUP_PROG targets | grep error >/dev/null 2>&1 + if [ $? -eq 0 ] + then + : + else + _notrun "This test requires dm error support" + fi +} + # this test requires the device mapper flakey target # _require_dm_flakey()