From e3a43a873c20128ef38015696d979c2f5b5b0ef6 Mon Sep 17 00:00:00 2001 From: Anand Jain Date: Mon, 21 Sep 2015 13:06:18 +1000 Subject: [PATCH] dm-error: add functions to create dm-error device Controlled EIO from the device is achieved using the dm device. Helper functions are at common/dmerror. Broadly steps will include calling _dmerror_init(). _dmerror_init() will use SCRATCH_DEV to create dm linear device and assign DMERROR_DEV to /dev/mapper/error-test. When test script is ready to get EIO, the test cases can call _dmerror_load_table() which then it will load the dm error. so that reading DMERROR_DEV will cause EIO. After the test case is complete, cleanup must be done by calling _dmerror_cleanup(). Signed-off-by: Anand Jain Reviewed-by: Filipe Manana Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- common/dmerror | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++ common/rc | 13 +++++++-- 2 files changed, 90 insertions(+), 2 deletions(-) create mode 100644 common/dmerror diff --git a/common/dmerror b/common/dmerror new file mode 100644 index 00000000..a81856d0 --- /dev/null +++ b/common/dmerror @@ -0,0 +1,79 @@ +##/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 + +# this test requires the device mapper error target +# +_dmerror_required() +{ + _require_command "$DMSETUP_PROG" dmsetup + + _require_block_device $SCRATCH_DEV + _require_sane_bdev_flush $SCRATCH_DEV + + modprobe dm-mod >/dev/null 2>&1 + $DMSETUP_PROG targets | grep error >/dev/null 2>&1 + [ $? -ne 0 ] && _notrun "This test requires dm error support" +} + +_dmerror_init() +{ + local dm_backing_dev=$SCRATCH_DEV + + $DMSETUP_PROG remove error-test > /dev/null 2>&1 + + local blk_dev_size=`blockdev --getsz $dm_backing_dev` + + DMERROR_DEV='/dev/mapper/error-test' + + DMLINEAR_TABLE="0 $blk_dev_size linear $dm_backing_dev 0" + + $DMSETUP_PROG create error-test --table "$DMLINEAR_TABLE" || \ + _fatal "failed to create dm linear device" + + DMERROR_TABLE="0 $blk_dev_size error $dm_backing_dev 0" +} + +_dmerror_mount_options() +{ + echo `_common_dev_mount_options $*` $DMERROR_DEV $SCRATCH_MNT +} + +_dmerror_mount() +{ + _mount -t $FSTYP `_dmerror_mount_options $*` +} + +_dmerror_cleanup() +{ + $UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1 + $DMSETUP_PROG remove error-test > /dev/null 2>&1 +} + +_dmerror_load_table() +{ + $DMSETUP_PROG suspend error-test + [ $? -ne 0 ] && _fail "dmsetup suspend failed" + + $DMSETUP_PROG load error-test --table "$DMERROR_TABLE" + [ $? -ne 0 ] && _fail "dmsetup failed to load error table" + + $DMSETUP_PROG resume error-test + [ $? -ne 0 ] && _fail "dmsetup resume failed" +} diff --git a/common/rc b/common/rc index 0049f6ec..1094de4b 100644 --- a/common/rc +++ b/common/rc @@ -211,11 +211,20 @@ _mount_ops_filter() } +# Used for mounting non-scratch devices (e.g. loop, dm constructs) +# with the safe set of scratch mount options (e.g. loop image may be +# hosted on $SCRATCH_DEV, so can't use external scratch devices). +_common_dev_mount_options() +{ + echo $MOUNT_OPTIONS $SELINUX_MOUNT_OPTIONS $* +} + _scratch_mount_options() { - _scratch_options mount + _scratch_options mount - echo $SCRATCH_OPTIONS $MOUNT_OPTIONS $SELINUX_MOUNT_OPTIONS $* $SCRATCH_DEV $SCRATCH_MNT + echo `_common_dev_mount_options $*` $SCRATCH_OPTIONS \ + $SCRATCH_DEV $SCRATCH_MNT } _scratch_mount() -- 2.39.5