#!/usr/local/bin/ksh93
#
# Copyright (c) 2010 Spectra Logic Corporation
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# $FreeBSD: releng/12.1/tests/sys/cddl/zfs/tests/zvol_thrash/zvol_thrash_001_pos.ksh 329867 2018-02-23 16:31:00Z asomers $
#

. $STF_SUITE/include/libtest.kshlib
. $STF_SUITE/include/libgnop.kshlib

# Cleanup function.  Kill each of the children.
function docleanup
{
	for CPID in $CHILDREN
	do
		echo "Killing $CPID"
		kill $CPID
	done
	for CPID in $CHILDREN
	do
		wait $CPID
	done
}

function childcleanup
{
	exit 0
}

# Wait for the timeout, and then kill the child processes.
function childrentimeout
{
	log_note "childrentimeout process waiting $1 seconds"
	sleep $1
	docleanup
}

function mk_vols
{
	ADISKS=($DISKS)				#Create an array for convenience
	N_DISKS=${#ADISKS[@]}
	N_MIRRORS=$(($N_DISKS / 2 ))
	# Use a special ksh93 expansion to generate the list of gnop devices
	GNOPS=${DISKS//~(E)([[:space:]]+|$)/.nop\1}
	setup_mirrors $N_MIRRORS $GNOPS
	for pool in `all_pools`; do
		# Create 4 ZVols per pool.  Write a geom label to each, just so
		# that we have another geom class between zvol and the vdev
		# taster.  That thwarts detection of zvols based on a geom
		# producer's class name, as was attempted by Perforce change
		# 538882
		for ((j=0; $j<4; j=$j+1)); do
			$ZFS create -V 10G $pool/testvol.$j
			glabel label testlabel$j /dev/zvol/$pool/testvol.$j
		done
	done
}

export CHILDREN=""

log_onexit docleanup

log_assert "Cause frequent device removal and arrival in the prescence of zvols.  ZFS should not crash or hang while tasting them for VDev GUIDs."
mk_vols
for p in `all_pools`
do
	#Take the first gnop in the pool
	typeset gnop
	typeset disk
	gnop=`get_disklist $p | cut -d " " -f 1`
	disk=${gnop%.nop}

	log_note "thrashing $gnop"
	trap childcleanup INT TERM && while `true`; do
	log_must destroy_gnop $disk
	$SLEEP 5
	log_must create_gnop $disk
	$SLEEP 5
	done &
	CHILDREN="$CHILDREN $!"
done

log_note "Waiting $RUNTIME seconds for potential ZFS failure"
childrentimeout $RUNTIME

log_pass
