1 files changed, 98 insertions, 0 deletions
diff --git a/tools/testing/selftests/zram/zram01.sh b/tools/testing/selftests/zram/zram01.sh
new file mode 100755
index 000000000000..2a2475d4b201
--- /dev/null
+++ b/tools/testing/selftests/zram/zram01.sh
@@ -0,0 +1,98 @@
+#!/bin/bash
+# Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
+# GNU General Public License for more details.
+#
+# Test creates several zram devices with different filesystems on them.
+# It fills each device with zeros and checks that compression works.
+#
+# Author: Alexey Kodanev <alexey.kodanev@oracle.com>
+# Modified: Naresh Kamboju <naresh.kamboju@linaro.org>
+
+TCID="zram01"
+ERR_CODE=0
+
+. ./zram_lib.sh
+
+# Test will create the following number of zram devices:
+dev_num=1
+# This is a list of parameters for zram devices.
+# Number of items must be equal to 'dev_num' parameter.
+zram_max_streams="2"
+
+# The zram sysfs node 'disksize' value can be either in bytes,
+# or you can use mem suffixes. But in some old kernels, mem
+# suffixes are not supported, for example, in RHEL6.6GA's kernel
+# layer, it uses strict_strtoull() to parse disksize which does
+# not support mem suffixes, in some newer kernels, they use
+# memparse() which supports mem suffixes. So here we just use
+# bytes to make sure everything works correctly.
+zram_sizes="2097152" # 2MB
+zram_mem_limits="2M"
+zram_filesystems="ext4"
+zram_algs="lzo"
+
+zram_fill_fs()
+{
+	local mem_free0=$(free -m | awk 'NR==2 {print $4}')
+
+	for i in $(seq 0 $(($dev_num - 1))); do
+		echo "fill zram$i..."
+		local b=0
+		while [ true ]; do
+			dd conv=notrunc if=/dev/zero of=zram${i}/file \
+				oflag=append count=1 bs=1024 status=none \
+				> /dev/null 2>&1 || break
+			b=$(($b + 1))
+		done
+		echo "zram$i can be filled with '$b' KB"
+	done
+
+	local mem_free1=$(free -m | awk 'NR==2 {print $4}')
+	local used_mem=$(($mem_free0 - $mem_free1))
+
+	local total_size=0
+	for sm in $zram_sizes; do
+		local s=$(echo $sm | sed 's/M//')
+		total_size=$(($total_size + $s))
+	done
+
+	echo "zram used ${used_mem}M, zram disk sizes ${total_size}M"
+
+	local v=$((100 * $total_size / $used_mem))
+
+	if [ "$v" -lt 100 ]; then
+		echo "FAIL compression ratio: 0.$v:1"
+		ERR_CODE=-1
+		zram_cleanup
+		return
+	fi
+
+	echo "zram compression ratio: $(echo "scale=2; $v / 100 " | bc):1: OK"
+}
+
+zram_load
+zram_max_streams
+zram_compress_alg
+zram_set_disksizes
+zram_set_memlimit
+zram_makefs
+zram_mount
+
+zram_fill_fs
+zram_cleanup
+zram_unload
+
+if [ $ERR_CODE -ne 0 ]; then
+	echo "$TCID : [FAIL]"
+else
+	echo "$TCID : [PASS]"
+fi