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# Copyright (c) 2017 by Lawrence Livermore National Security, LLC.
# Use is subject to license terms.
#

. $STF_SUITE/include/libtest.shlib
. $STF_SUITE/tests/functional/mmp/mmp.cfg


function check_pool_import # pool opts token keyword
{
	typeset pool=${1:-$MMP_POOL}
	typeset opts=$2
	typeset token=$3
	typeset keyword=$4

	zpool import $opts 2>&1 | \
	    nawk -v token="$token:" '($1==token) {print $0}' | \
	    grep -i "$keyword" > /dev/null 2>&1

	return $?
}

function is_pool_imported # pool opts
{
	typeset pool=${1:-$MMP_POOL}
	typeset opts=$2

	check_pool_import "$pool" "$opts" "status" \
	    "The pool is currently imported"
	return $?
}

function wait_pool_imported # pool opts
{
	typeset pool=${1:-$MMP_POOL}
	typeset opts=$2

	while is_pool_imported "$pool" "$opts"; do
		log_must sleep 5
	done

	return 0
}

function try_pool_import # pool opts message
{
	typeset pool=${1:-$MMP_POOL}
	typeset opts=$2
	typeset msg=$3

	zpool import $opts $pool 2>&1 | grep -i "$msg"

	return $?
}

function mmp_set_hostid
{
	typeset hostid=$1

	zgenhostid $1

	if [ $(hostid) != "$hostid" ]; then
		return 1
	fi

	return 0
}

function mmp_clear_hostid
{
	rm -f $HOSTID_FILE
}

function mmp_pool_create_simple # pool dir
{
	typeset pool=${1:-$MMP_POOL}
	typeset dir=${2:-$MMP_DIR}

	log_must mkdir -p $dir
	log_must rm -f $dir/*
	log_must truncate -s $MINVDEVSIZE $dir/vdev1 $dir/vdev2

	log_must mmp_clear_hostid
	log_must mmp_set_hostid $HOSTID1
	log_must zpool create -f -o cachefile=$MMP_CACHE $pool \
	    mirror $dir/vdev1 $dir/vdev2
	log_must zpool set multihost=on $pool
}

function mmp_pool_create # pool dir
{
	typeset pool=${1:-$MMP_POOL}
	typeset dir=${2:-$MMP_DIR}
	typeset opts="-VVVVV -T120 -M -k0 -f $dir -E -p $pool"

	mmp_pool_create_simple $pool $dir

	log_must mv $MMP_CACHE ${MMP_CACHE}.stale
	log_must zpool export $pool
	log_must mmp_clear_hostid
	log_must mmp_set_hostid $HOSTID2

	log_note "Starting ztest in the background as hostid $HOSTID1"
	log_must eval "ZFS_HOSTID=$HOSTID1 ztest $opts >$MMP_ZTEST_LOG 2>&1 &"

	while ! is_pool_imported "$pool" "-d $dir"; do
		log_must pgrep ztest
		log_must sleep 5
	done
}

function mmp_pool_destroy # pool dir
{
	typeset pool=${1:-$MMP_POOL}
	typeset dir=${2:-$MMP_DIR}

	ZTESTPID=$(pgrep ztest)
	if [ -n "$ZTESTPID" ]; then
		log_must kill $ZTESTPID
		wait $ZTESTPID
	fi

	if poolexists $pool; then
		destroy_pool $pool
        fi

	log_must rm -f $dir/*
	mmp_clear_hostid
}

function mmp_pool_set_hostid # pool hostid
{
	typeset pool=$1
	typeset hostid=$2

	log_must mmp_clear_hostid
	log_must mmp_set_hostid $hostid
	log_must zpool export $pool
	log_must zpool import $pool

	return 0
}
# Return the number of seconds the activity check portion of the import process
# will take.  Does not include the time to find devices and assemble a config.
# Note that the activity check may be skipped, e.g. if the pool and host
# hostid's match, but this will return non-zero because mmp_* are populated.
function seconds_mmp_waits_for_activity
{
	typeset pool=$1
	typeset devpath=$2

	typeset seconds=0
	typeset devices=${#DISK[@]}
	typeset import_intervals=$(get_tunable MULTIHOST_IMPORT_INTERVALS)
	typeset import_interval=$(get_tunable MULTIHOST_INTERVAL)
	typeset tmpfile=$(mktemp)
	typeset mmp_fail
	typeset mmp_write
	typeset mmp_delay

	log_must zdb -e -p $devpath $pool >$tmpfile 2>/dev/null
	mmp_fail=$(awk '/mmp_fail/ {print $NF}' $tmpfile)
	mmp_write=$(awk '/mmp_write/ {print $NF}' $tmpfile)
	mmp_delay=$(awk '/mmp_delay/ {print $NF}' $tmpfile)
	if [ -f $tmpfile ]; then
		rm $tmpfile
	fi

	# In order of preference:
	if [ -n $mmp_fail -a -n $mmp_write ]; then
		seconds=$((2*mmp_fail*mmp_write/1000))
	elif [ -n $mmp_delay ]; then
		# MMP V0: Based on mmp_delay from the best Uberblock
		seconds=$((import_intervals*devices*mmp_delay/1000000000))
	else
		# Non-MMP aware: Based on zfs_multihost_interval and import_intervals
		seconds=$((import_intervals*import_interval/1000))
	fi

	echo $seconds
}

function import_no_activity_check # pool opts
{
	typeset pool=$1
	typeset opts=$2

	typeset max_duration=$((MMP_TEST_DURATION_DEFAULT-1))

	SECONDS=0
	zpool import $opts $pool
	typeset rc=$?

	if [[ $SECONDS -gt $max_duration ]]; then
		log_fail "ERROR: import_no_activity_check unexpected activity \
check (${SECONDS}s gt $max_duration)"
	fi

	return $rc
}

function import_activity_check # pool opts act_test_duration
{
	typeset pool=$1
	typeset opts=$2
	typeset min_duration=${3:-$MMP_TEST_DURATION_DEFAULT}

	SECONDS=0
	zpool import $opts $pool
	typeset rc=$?

	if [[ $SECONDS -le $min_duration ]]; then
		log_fail "ERROR: import_activity_check expected activity check \
(${SECONDS}s le min_duration $min_duration)"
	fi

	return $rc
}

function clear_mmp_history
{
	log_must set_tunable64 MULTIHOST_HISTORY $MMP_HISTORY_OFF
	log_must set_tunable64 MULTIHOST_HISTORY $MMP_HISTORY
}

function count_skipped_mmp_writes # pool duration
{
	typeset pool=$1
	typeset -i duration=$2
	typeset hist_path="/proc/spl/kstat/zfs/$pool/multihost"

	sleep $duration
	awk 'BEGIN {count=0}; $NF == "-" {count++}; END {print count};' "$hist_path"
}

function count_mmp_writes # pool duration
{
	typeset pool=$1
	typeset -i duration=$2
	typeset hist_path="/proc/spl/kstat/zfs/$pool/multihost"

	sleep $duration
	awk 'BEGIN {count=0}; $NF != "-" {count++}; END {print count};' "$hist_path"
}

function summarize_uberblock_mmp # device
{
	typeset device=$1

	zdb -luuuu $device | awk '
	BEGIN				{write_fail_present=0; write_fail_missing=0; uber_invalid=0;}
	/Uberblock\[[0-9][0-9]*\]/	{delay=-99; write=-99; fail=-99; total++; if (/invalid/) {uber_invalid++};};
	/mmp_fail/			{fail=$3};
	/mmp_seq/			{seq=$3};
	/mmp_write/			{write=$3};
	/mmp_delay/			{delay=$3; if (delay==0) {delay_zero++};};
	/mmp_valid/ && delay>0 && write>0 && fail>0 {write_fail_present++};
	/mmp_valid/ && delay>0 && (write<=0 || fail<=0) {write_fail_missing++};
	/mmp_valid/ && delay>0 && write<=0 {write_missing++};
	/mmp_valid/ && delay>0 && fail<=0 {fail_missing++};
	/mmp_valid/ && delay>0 && seq>0 {seq_nonzero++};
	END {
		print "total_uberblocks " total;
		print "delay_zero " delay_zero;
		print "write_fail_present " write_fail_present;
		print "write_fail_missing " write_fail_missing;
		print "write_missing " write_missing;
		print "fail_missing " fail_missing;
		print "seq_nonzero " seq_nonzero;
		print "uberblock_invalid " uber_invalid;
	}'
}

function count_mmp_write_fail_present # device
{
	typeset device=$1

	summarize_uberblock_mmp $device | awk '/write_fail_present/ {print $NF}'
}

function count_mmp_write_fail_missing # device
{
	typeset device=$1

	summarize_uberblock_mmp $device | awk '/write_fail_missing/ {print $NF}'
}

function verify_mmp_write_fail_present # device
{
	typeset device=$1

	count=$(count_mmp_write_fail_present $device)
	log_note "present count: $count"
	if [ $count -eq 0 ]; then
		summarize_uberblock_mmp $device
		log_note "----- snip -----"
		zdb -luuuu $device
		log_note "----- snip -----"
		log_fail "No Uberblocks contain valid mmp_write and fail values"
	fi

	count=$(count_mmp_write_fail_missing $device)
	log_note "missing count: $count"
	if [ $count -gt 0 ]; then
		summarize_uberblock_mmp $device
		log_note "----- snip -----"
		zdb -luuuu $device
		log_note "----- snip -----"
		log_fail "Uberblocks missing mmp_write or mmp_fail"
	fi
}