#!/bin/ksh -p
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
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#
# Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#

#
# Copyright (c) 2013, 2016 by Delphix. All rights reserved.
#

. $STF_SUITE/include/libtest.shlib

#
# DESCRIPTION:
# With 'compression' or 'compress'  set, changing filesystem blocksize cannot
# cause system panic
#
# STRATEGY:
#	1. Set 'compression' or "compress" to on
#	2. Set different blocksize with ZFS filesystem
#	3. Use 'mkfile' create single block and multi-block files
#	4. Verify the system continued work
#

verify_runnable "both"

function cleanup
{
	rm -f $TESTDIR/*
}

log_assert "Changing blocksize doesn't casue system panic with compression settings"
log_onexit cleanup

fs=$TESTPOOL/$TESTFS
single_blk_file=$TESTDIR/singleblkfile.$$
multi_blk_file=$TESTDIR/multiblkfile.$$
typeset -i blksize=512
typeset -i fsize=0
typeset -i offset=0

for propname in "compression" "compress"
do
	for value in $(get_compress_opts zfs_compress)
	do
		log_must zfs set $propname=$value $fs
		if [[ $value == "gzip-6" ]]; then
			value="gzip"
		fi
		real_val=$(get_prop $propname $fs)
		[[ $real_val != $value ]] && \
			log_fail "Set property $propname=$value failed."

		(( blksize = 512 ))
		while (( blksize <= 131072 )); do
			log_must zfs set recordsize=$blksize $fs
			(( offset = $RANDOM ))
			if (( offset > blksize )); then
				(( offset = offset % blksize ))
			fi
			if (( (offset % 2) == 0 )); then
				#keep offset as non-power-of-2
				(( offset = offset + 1 ))
			fi
			(( fsize = offset ))
			log_must mkfile $fsize $single_blk_file
			(( fsize = blksize + offset ))
			log_must mkfile $fsize $multi_blk_file

			(( blksize = blksize * 2 ))
		done
	done
done

log_pass "The system works as expected while changing blocksize with compression settings"