1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0-or-later
3# Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved.
4#
5# Test creates several zram devices with different filesystems on them.
6# It fills each device with zeros and checks that compression works.
7#
8# Author: Alexey Kodanev <alexey.kodanev@oracle.com>
9# Modified: Naresh Kamboju <naresh.kamboju@linaro.org>
10
11TCID="zram01"
12ERR_CODE=0
13
14. ./zram_lib.sh
15
16# Test will create the following number of zram devices:
17dev_num=1
18# This is a list of parameters for zram devices.
19# Number of items must be equal to 'dev_num' parameter.
20zram_max_streams="2"
21
22# The zram sysfs node 'disksize' value can be either in bytes,
23# or you can use mem suffixes. But in some old kernels, mem
24# suffixes are not supported, for example, in RHEL6.6GA's kernel
25# layer, it uses strict_strtoull() to parse disksize which does
26# not support mem suffixes, in some newer kernels, they use
27# memparse() which supports mem suffixes. So here we just use
28# bytes to make sure everything works correctly.
29zram_sizes="2097152" # 2MB
30zram_mem_limits="2M"
31zram_filesystems="ext4"
32zram_algs="lzo"
33
34zram_fill_fs()
35{
36	local mem_free0=$(free -m | awk 'NR==2 {print $4}')
37
38	for i in $(seq 0 $(($dev_num - 1))); do
39		echo "fill zram$i..."
40		local b=0
41		while [ true ]; do
42			dd conv=notrunc if=/dev/zero of=zram${i}/file \
43				oflag=append count=1 bs=1024 status=none \
44				> /dev/null 2>&1 || break
45			b=$(($b + 1))
46		done
47		echo "zram$i can be filled with '$b' KB"
48	done
49
50	local mem_free1=$(free -m | awk 'NR==2 {print $4}')
51	local used_mem=$(($mem_free0 - $mem_free1))
52
53	local total_size=0
54	for sm in $zram_sizes; do
55		local s=$(echo $sm | sed 's/M//')
56		total_size=$(($total_size + $s))
57	done
58
59	echo "zram used ${used_mem}M, zram disk sizes ${total_size}M"
60
61	local v=$((100 * $total_size / $used_mem))
62
63	if [ "$v" -lt 100 ]; then
64		echo "FAIL compression ratio: 0.$v:1"
65		ERR_CODE=-1
66		zram_cleanup
67		return
68	fi
69
70	echo "zram compression ratio: $(echo "scale=2; $v / 100 " | bc):1: OK"
71}
72
73check_prereqs
74zram_load
75zram_max_streams
76zram_compress_alg
77zram_set_disksizes
78zram_set_memlimit
79zram_makefs
80zram_mount
81
82zram_fill_fs
83zram_cleanup
84zram_unload
85
86if [ $ERR_CODE -ne 0 ]; then
87	echo "$TCID : [FAIL]"
88else
89	echo "$TCID : [PASS]"
90fi
91