# SPDX-License-Identifier: CDDL-1.0
#
# This file and its contents are supplied under the terms of the
# Common Development and Distribution License ("CDDL"), version 1.0.
# You may only use this file in accordance with the terms of version
# 1.0 of the CDDL.
#
# A full copy of the text of the CDDL should have accompanied this
# source.  A copy of the CDDL is also available via the Internet at
# http://www.illumos.org/license/CDDL.
#

#
# Copyright (c) 2012, 2016 by Delphix. All rights reserved.
#

. $STF_SUITE/include/math.shlib

export TESTVOL="testvol.nopwrite"
export VOLSIZE="256M"
export MEGS="64"

function verify_nopwrite
{
	typeset origin=$1
	typeset snap=$2
	typeset clone=$3
	typeset low=1
	typeset high=99

	sync_pool
	for i in origin snap clone; do
		for j in used refer usedbychildren written; do
			typeset ${i}_$j=$(get_prop $j $(eval echo \$$i))
		done
	done

	#
	# If we are dealing with a volume, deduct the refreserv from the used
	# value to prevent real failures from being masked by the unexpected
	# extra space. Also, volumes use more space for metadata, so adjust the
	# percentages to be more forgiving.
	#
	if [[ "$(get_prop type $origin)" = "volume" ]]; then
		typeset rr=$(get_prop refreserv $origin)
		((origin_used -= rr ))
		low=2
		high=98
	fi

	# These values should differ greatly with nopwrite.
	within_percent $origin_used $clone_used $low && return 1
	within_percent $origin_refer $origin_usedbychildren $low && return 1
	within_percent $snap_written $clone_written $low && return 1

	# These values should be nearly the same with nopwrite.
	within_percent $origin_used $clone_refer $high || return 1
	within_percent $origin_used $snap_refer $high || return 1

	#
	# The comparisons below should be within 90% regardless of nopwrite.
	# They're here for sanity.
	#
	typeset deadlist=$(zdb -Pddd $clone | awk '/Deadlist:/ {print $2}')
	within_percent $deadlist $clone_written 90 || return 1
	within_percent $snap_refer $snap_written 90 || return 1

	return 0
}
