1#!/bin/bash
2# Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved.
3#
4# This program is free software; you can redistribute it and/or
5# modify it under the terms of the GNU General Public License as
6# published by the Free Software Foundation; either version 2 of
7# the License, or (at your option) any later version.
8#
9# This program is distributed in the hope that it would be useful,
10# but WITHOUT ANY WARRANTY; without even the implied warranty of
11# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
12# GNU General Public License for more details.
13#
14# Test creates several zram devices with different filesystems on them.
15# It fills each device with zeros and checks that compression works.
16#
17# Author: Alexey Kodanev <alexey.kodanev@oracle.com>
18# Modified: Naresh Kamboju <naresh.kamboju@linaro.org>
19
20TCID="zram01"
21ERR_CODE=0
22
23. ./zram_lib.sh
24
25# Test will create the following number of zram devices:
26dev_num=1
27# This is a list of parameters for zram devices.
28# Number of items must be equal to 'dev_num' parameter.
29zram_max_streams="2"
30
31# The zram sysfs node 'disksize' value can be either in bytes,
32# or you can use mem suffixes. But in some old kernels, mem
33# suffixes are not supported, for example, in RHEL6.6GA's kernel
34# layer, it uses strict_strtoull() to parse disksize which does
35# not support mem suffixes, in some newer kernels, they use
36# memparse() which supports mem suffixes. So here we just use
37# bytes to make sure everything works correctly.
38zram_sizes="2097152" # 2MB
39zram_mem_limits="2M"
40zram_filesystems="ext4"
41zram_algs="lzo"
42
43zram_fill_fs()
44{
45	local mem_free0=$(free -m | awk 'NR==2 {print $4}')
46
47	for i in $(seq 0 $(($dev_num - 1))); do
48		echo "fill zram$i..."
49		local b=0
50		while [ true ]; do
51			dd conv=notrunc if=/dev/zero of=zram${i}/file \
52				oflag=append count=1 bs=1024 status=none \
53				> /dev/null 2>&1 || break
54			b=$(($b + 1))
55		done
56		echo "zram$i can be filled with '$b' KB"
57	done
58
59	local mem_free1=$(free -m | awk 'NR==2 {print $4}')
60	local used_mem=$(($mem_free0 - $mem_free1))
61
62	local total_size=0
63	for sm in $zram_sizes; do
64		local s=$(echo $sm | sed 's/M//')
65		total_size=$(($total_size + $s))
66	done
67
68	echo "zram used ${used_mem}M, zram disk sizes ${total_size}M"
69
70	local v=$((100 * $total_size / $used_mem))
71
72	if [ "$v" -lt 100 ]; then
73		echo "FAIL compression ratio: 0.$v:1"
74		ERR_CODE=-1
75		zram_cleanup
76		return
77	fi
78
79	echo "zram compression ratio: $(echo "scale=2; $v / 100 " | bc):1: OK"
80}
81
82check_prereqs
83zram_load
84zram_max_streams
85zram_compress_alg
86zram_set_disksizes
87zram_set_memlimit
88zram_makefs
89zram_mount
90
91zram_fill_fs
92zram_cleanup
93zram_unload
94
95if [ $ERR_CODE -ne 0 ]; then
96	echo "$TCID : [FAIL]"
97else
98	echo "$TCID : [PASS]"
99fi
100