#!/bin/sh
# Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved.
# Copyright (c) 2019 Petr Vorel <pvorel@suse.cz>
# Author: Alexey Kodanev <alexey.kodanev@oracle.com>

dev_makeswap=-1
dev_mounted=-1

TST_NEEDS_TMPDIR=1
TST_SETUP="zram_load"
TST_CLEANUP="zram_cleanup"
. tst_test.sh

zram_cleanup()
{
	local i

	for i in $(seq 0 $dev_makeswap); do
		swapoff /dev/zram$i
	done

	for i in $(seq 0 $dev_mounted); do
		umount /dev/zram$i
	done

	for i in $(seq 0 $(($dev_num - 1))); do
		echo 1 > /sys/block/zram${i}/reset
	done

	rmmod zram > /dev/null 2>&1
}

zram_load()
{
	tst_res TINFO "create '$dev_num' zram device(s)"
	modprobe zram num_devices=$dev_num || \
		tst_brk TBROK "failed to insert zram module"

	dev_num_created=$(ls /dev/zram* | wc -w)

	if [ "$dev_num_created" -ne "$dev_num" ]; then
		tst_brk TFAIL "unexpected num of devices: $dev_num_created"
	else
		tst_res TPASS "test succeeded"
	fi
}

zram_max_streams()
{
	if tst_kvcmp -lt "3.15" -o -ge "4.7"; then
		tst_res TCONF "The device attribute max_comp_streams was"\
		               "introduced in kernel 3.15 and deprecated in 4.7"
		return
	fi

	tst_res TINFO "set max_comp_streams to zram device(s)"

	local i=0

	for max_s in $zram_max_streams; do
		local sys_path="/sys/block/zram${i}/max_comp_streams"
		echo $max_s > $sys_path || \
			tst_brk TFAIL "failed to set '$max_s' to $sys_path"
		local max_streams=$(cat $sys_path)

		[ "$max_s" -ne "$max_streams" ] && \
			tst_brk TFAIL "can't set max_streams '$max_s', get $max_stream"

		i=$(($i + 1))
		tst_res TINFO "$sys_path = '$max_streams' ($i/$dev_num)"
	done

	tst_res TPASS "test succeeded"
}

zram_compress_alg()
{
	if tst_kvcmp -lt "3.15"; then
		tst_res TCONF "device attribute comp_algorithm is"\
			"introduced since kernel v3.15, the running kernel"\
			"does not support it"
		return
	fi

	local i=0

	tst_res TINFO "test that we can set compression algorithm"
	local algs="$(cat /sys/block/zram0/comp_algorithm)"
	tst_res TINFO "supported algs: $algs"

	for alg in $zram_algs; do
		local sys_path="/sys/block/zram${i}/comp_algorithm"
		echo "$alg" >  $sys_path || \
			tst_brk TFAIL "can't set '$alg' to $sys_path"
		i=$(($i + 1))
		tst_res TINFO "$sys_path = '$alg' ($i/$dev_num)"
	done

	tst_res TPASS "test succeeded"
}

zram_set_disksizes()
{
	local i=0
	local ds

	tst_res TINFO "set disk size to zram device(s)"
	for ds in $zram_sizes; do
		local sys_path="/sys/block/zram${i}/disksize"
		echo "$ds" >  $sys_path || \
			tst_brk TFAIL "can't set '$ds' to $sys_path"

		i=$(($i + 1))
		tst_res TINFO "$sys_path = '$ds' ($i/$dev_num)"
	done

	tst_res TPASS "test succeeded"
}

zram_set_memlimit()
{
	if tst_kvcmp -lt "3.18"; then
		tst_res TCONF "device attribute mem_limit is"\
			"introduced since kernel v3.18, the running kernel"\
			"does not support it"
		return
	fi

	local i=0
	local ds

	tst_res TINFO "set memory limit to zram device(s)"

	for ds in $zram_mem_limits; do
		local sys_path="/sys/block/zram${i}/mem_limit"
		echo "$ds" >  $sys_path || \
			tst_brk TFAIL "can't set '$ds' to $sys_path"

		i=$(($i + 1))
		tst_res TINFO "$sys_path = '$ds' ($i/$dev_num)"
	done

	tst_res TPASS "test succeeded"
}

zram_makeswap()
{
	tst_res TINFO "make swap with zram device(s)"
	tst_require_cmds mkswap swapon swapoff
	local i=0

	for i in $(seq 0 $(($dev_num - 1))); do
		ROD mkswap /dev/zram$i
		ROD swapon /dev/zram$i
		tst_res TINFO "done with /dev/zram$i"
		dev_makeswap=$i
	done

	tst_res TPASS "making zram swap succeeded"
}

zram_swapoff()
{
	tst_require_cmds swapoff
	local i

	for i in $(seq 0 $dev_makeswap); do
		ROD swapoff /dev/zram$i
	done
	dev_makeswap=-1

	tst_res TPASS "swapoff completed"
}

zram_makefs()
{
	tst_require_cmds mkfs
	local i=0

	for fs in $zram_filesystems; do
		# if requested fs not supported default it to ext2
		tst_supported_fs $fs 2> /dev/null || fs=ext2

		tst_res TINFO "make $fs filesystem on /dev/zram$i"
		mkfs.$fs /dev/zram$i > err.log 2>&1
		if [ $? -ne 0 ]; then
			cat err.log
			tst_brk TFAIL "failed to make $fs on /dev/zram$i"
		fi

		i=$(($i + 1))
	done

	tst_res TPASS "zram_makefs succeeded"
}

zram_mount()
{
	local i=0

	for i in $(seq 0 $(($dev_num - 1))); do
		tst_res TINFO "mount /dev/zram$i"
		mkdir zram$i
		ROD mount /dev/zram$i zram$i
		dev_mounted=$i
	done

	tst_res TPASS "mount of zram device(s) succeeded"
}

modinfo zram > /dev/null 2>&1 ||
	tst_brk TCONF "zram not configured in kernel"