#!/bin/bash

if [ $# != 1 ]; then
        echo "$0 <target_dir>"
        exit 1
fi

if [ ! -e "$1" ]; then
        echo "Target dir does not exist, exiting."
        exit 1
fi

target_dir="$1"
temp_dir="/tmp/filetest.$$"

mkdir -p $temp_dir

cd $temp_dir

echo "Temp dir: $temp_dir"
echo "Target dir: $target_dir"
echo ""
echo "Creating temp files..."

i=0

while [ 1 ]; do
        free_kbytes=`df -k $target_dir | tail -n 1 | awk '{ print $4; }'`

        if [ $free_kbytes -lt 200000 ]; then
                break
        fi

        file="temp${i}.tmp"

        echo "$file"

        dd if=/dev/urandom of=$file bs=1M count=200 2>/dev/null >/dev/null

        md5sum $file >> md5sum.txt

        mv $file $target_dir

        sync
        echo 3 > /proc/sys/vm/drop_caches

        i=$((i + 1))
done

echo ""
echo "Checking temp files..."

cd $target_dir

md5sum -c < $temp_dir/md5sum.txt