common/dmerror

##/bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015 Oracle.  All Rights Reserved.
#
# common functions for setting up and tearing down a dmerror device

_dmerror_setup()
{
	local dm_backing_dev=$SCRATCH_DEV

	local blk_dev_size=`blockdev --getsz $dm_backing_dev`

	export DMERROR_DEV='/dev/mapper/error-test'

	export DMLINEAR_TABLE="0 $blk_dev_size linear $dm_backing_dev 0"

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

_dmerror_init()
{
	_dmerror_setup
	_dmsetup_remove error-test
	_dmsetup_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()
{
	$DMSETUP_PROG resume error-test > /dev/null 2>&1
	$UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
	_dmsetup_remove error-test

	unset DMERROR_DEV DMLINEAR_TABLE DMERROR_TABLE
}

_dmerror_load_error_table()
{
	local load_res=0
	local resume_res=0

	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"
	load_res=$?

	$DMSETUP_PROG resume error-test
	resume_res=$?

	[ $load_res -ne 0 ] && _fail "dmsetup failed to load error table"
	[ $resume_res -ne 0 ] && _fail  "dmsetup resume failed"
}

_dmerror_load_working_table()
{
	local load_res=0
	local resume_res=0

	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"
	load_res=$?

	$DMSETUP_PROG resume error-test
	resume_res=$?

	[ $load_res -ne 0 ] && _fail "dmsetup failed to load error table"
	[ $resume_res -ne 0 ] && _fail  "dmsetup resume failed"
}