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	for i in $(seq $dev_start $dev_end); do
37		echo "fill zram$i..."
38		local b=0
39		while [ true ]; do
40			dd conv=notrunc if=/dev/zero of=zram${i}/file \
41				oflag=append count=1 bs=1024 status=none \
42				> /dev/null 2>&1 || break
43			b=$(($b + 1))
44		done
45		echo "zram$i can be filled with '$b' KB"
46
47		local mem_used_total=`awk '{print $3}' "/sys/block/zram$i/mm_stat"`
48		local v=$((100 * 1024 * $b / $mem_used_total))
49		if [ "$v" -lt 100 ]; then
50			 echo "FAIL compression ratio: 0.$v:1"
51			 ERR_CODE=-1
52			 return
53		fi
54
55		echo "zram compression ratio: $(echo "scale=2; $v / 100 " | bc):1: OK"
56	done
57}
58
59check_prereqs
60zram_load
61zram_max_streams
62zram_compress_alg
63zram_set_disksizes
64zram_set_memlimit
65zram_makefs
66zram_mount
67
68zram_fill_fs
69zram_cleanup
70
71if [ $ERR_CODE -ne 0 ]; then
72	echo "$TCID : [FAIL]"
73else
74	echo "$TCID : [PASS]"
75fi
76