apfstests/common/dmhugedisk

##/bin/bash
# SPDX-License-Identifier: GPL-2.0+
# Copyright (c) 2016 Oracle.  All Rights Reserved.
#
# Routines for creating huge (fake) disks

_require_dmhugedisk()
{
	_require_dm_target zero
	_require_dm_target snapshot
}

_dmhugedisk_init()
{
	test -z "$1" && _fatal "must specify sector count to _dmhugedisk_init"
	local dm_backing_dev=$SCRATCH_DEV
	local chunk_size="$2"

	if [ -z "$chunk_size" ]; then
		chunk_size=512
	fi

	_dmsetup_remove huge-test
	_dmsetup_remove huge-test-zero

	local blk_dev_size=$1

	DMHUGEDISK_ZERO='/dev/mapper/huge-test-zero'
	DMHUGEDISK_DEV='/dev/mapper/huge-test'

	DMHUGEDISK_ZERO_TABLE="0 $blk_dev_size zero"
	DMHUGEDISK_DEV_TABLE="0 $blk_dev_size snapshot $DMHUGEDISK_ZERO $SCRATCH_DEV N $chunk_size"

	_dmsetup_create huge-test-zero --table "$DMHUGEDISK_ZERO_TABLE" || \
		_fatal "failed to create dm huge zero device"
	_dmsetup_create huge-test --table "$DMHUGEDISK_DEV_TABLE" || \
		_fatal "failed to create dm huge device"
}

_dmhugedisk_cleanup()
{
	$UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
	_dmsetup_remove huge-test
	_dmsetup_remove huge-test-zero
}