common/dmerror

##/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

echo $MOUNT_OPTIONS | grep -q dax
if [ $? -eq 0 ]; then
	_notrun "Cannot run tests with DAX on dmerror devices"
fi

_dmerror_setup()
{
	local dm_backing_dev=$SCRATCH_DEV

	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"

	DMERROR_TABLE="0 $blk_dev_size error $dm_backing_dev 0"
}

_dmerror_init()
{
	_dmerror_setup
	$DMSETUP_PROG remove error-test > /dev/null 2>&1
	$DMSETUP_PROG create error-test --table "$DMLINEAR_TABLE" || \
		_fatal "failed to create dm linear device"
}

_dmerror_mount()
{
	_scratch_options mount
	$MOUNT_PROG -t $FSTYP `_common_dev_mount_options $*` $SCRATCH_OPTIONS \
		$DMERROR_DEV $SCRATCH_MNT
}

_dmerror_unmount()
{
	umount $SCRATCH_MNT
}

_dmerror_cleanup()
{
	$UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
	# wait for device to be fully settled so that 'dmsetup remove' doesn't
	# fail due to EBUSY
	$UDEV_SETTLE_PROG >/dev/null 2>&1
	$DMSETUP_PROG remove error-test > /dev/null 2>&1
}

_dmerror_load_error_table()
{
	suspend_opt="--nolockfs"

	if [ "$1" = "lockfs" ]; then
		suspend_opt=""
	elif [ -n "$*" ]; then
		suspend_opt="$*"
	fi

	$DMSETUP_PROG suspend $suspend_opt 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"
}

_dmerror_load_working_table()
{
	suspend_opt="--nolockfs"

	if [ "$1" = "lockfs" ]; then
		suspend_opt=""
	elif [ -n "$*" ]; then
		suspend_opt="$*"
	fi

	$DMSETUP_PROG suspend $suspend_opt error-test
	[ $? -ne 0 ] && _fail  "dmsetup suspend failed"

	$DMSETUP_PROG load error-test --table "$DMLINEAR_TABLE"
	[ $? -ne 0 ] && _fail "dmsetup failed to load error table"

	$DMSETUP_PROG resume error-test
	[ $? -ne 0 ] && _fail  "dmsetup resume failed"
}