common/dmdust

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2020 Facebook.  All Rights Reserved.
#
# common functions for setting up and tearing down a dmdust device

export DUST_NAME="dust-test.$seq"

_init_dust()
{
	local DEV_SIZE=`blockdev --getsz $SCRATCH_DEV`
	DUST_DEV=/dev/mapper/$DUST_NAME
	DUST_TABLE="0 $DEV_SIZE dust $SCRATCH_DEV 0 512"
	_dmsetup_create $DUST_NAME --table "$DUST_TABLE" || \
		_fatal "failed to create dust device"
}

_mount_dust()
{
	_scratch_options mount
	_mount -t $FSTYP `_common_dev_mount_options $*` $SCRATCH_OPTIONS \
		$DUST_DEV $SCRATCH_MNT
}

_unmount_dust()
{
	_unmount $SCRATCH_MNT
}

_cleanup_dust()
{
	# If dmsetup load fails then we need to make sure to do resume here
	# otherwise the umount will hang
	$DMSETUP_PROG resume $DUST_NAME > /dev/null 2>&1
	_unmount $SCRATCH_MNT > /dev/null 2>&1
	_dmsetup_remove $DUST_NAME
}