stress_tests: add stress test scripts

These were hosted at https://github.com/rfjakob/fsstress . To
make them easier to use for gocryptfs users and developers, add
them to the main repo.

stress_tests/extractloop.bash

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+set -eu
+
+# Setup
+cd /tmp
+wget -nv --show-progress -c https://www.kernel.org/pub/linux/kernel/v3.0/linux-3.0.tar.gz
+DIR1=$(mktemp -d)
+DIR2=$(mktemp -d)
+gocryptfs -q -init -extpass="echo test" $DIR1
+gocryptfs -q -extpass="echo test" -nosyslog $DIR1 $DIR2
+cd $DIR2
+
+# Cleanup trap
+# Note: gocryptfs may have already umounted itself because bash relays SIGINT
+# Just ignore fusermount errors.
+trap "cd /; fusermount -u -z $DIR2; rm -rf $DIR1 $DIR2" EXIT
+
+# Loop
+N=1
+while true
+do
+	echo -n "$N "
+	echo -n "extract "
+	tar xf /tmp/linux-3.0.tar.gz
+	echo -n "diff "
+	diff -ur linux-3.0 /tmp/linux-3.0
+	echo -n "rm "
+	rm -Rf linux-3.0
+	date
+	let N=$N+1
+done

stress_tests/fsstress-gocryptfs.bash

@@ -0,0 +1 @@
+fsstress-loopback.bash

stress_tests/fsstress-loopback.bash

@@ -0,0 +1,75 @@
+#!/bin/bash
+set -eu
+
+# Backing directory
+DIR=/tmp/a
+# Mountpoint
+MNT=/tmp/b
+# Debug log
+LOG=/tmp/log.txt
+# fsstress binary
+FSSTRESS=~/src/xfstests/ltp/fsstress
+
+if [ ! -x $FSSTRESS ]
+then
+	echo "fsstress binary not found, adjust FSSTRESS=$FSSTRESS"
+	exit 1
+fi
+
+# Cleanup + Setup
+fusermount -u -z $MNT &> /dev/null || true
+mkdir -p $DIR $MNT
+rm -Rf $DIR/*
+rm -Rf $MNT/*
+
+# FS-specific compile and mount
+MYNAME=$(basename $0)
+if [ $MYNAME = fsstress-loopback.bash ]; then
+	echo "Recompile go-fuse loopback"
+	cd $GOPATH/src/github.com/hanwen/go-fuse/example/loopback
+	go build && go install
+	$GOPATH/bin/loopback -l $MNT $DIR &
+elif [ $MYNAME = fsstress-gocryptfs.bash ]; then
+	echo "Recompile gocryptfs"
+	cd $GOPATH/src/github.com/rfjakob/gocryptfs
+	go build && go install
+	$GOPATH/bin/gocryptfs -q -init -extpass "echo test" -scryptn=10 $DIR
+	$GOPATH/bin/gocryptfs -q -extpass "echo test" -nosyslog $DIR $MNT
+else
+	echo Unknown mode: $MYNAME
+	exit 1
+fi
+
+echo -n "Waiting for mount: "
+while ! grep "$MNT fuse" /proc/self/mounts > /dev/null
+do
+	sleep 1
+	echo -n x
+done
+echo " done, debug log goes to $LOG"
+
+echo "Starting fsstress loop"
+N=1
+while true
+do
+	> $LOG
+
+	echo $N
+	mkdir $MNT/fsstress.1
+	echo -n "    fsstress.1 "
+	$FSSTRESS -r -m 8 -n 1000 -d $MNT/fsstress.1
+
+	mkdir $MNT/fsstress.2
+	echo -n "    fsstress.2 "
+	$FSSTRESS -p 20 -r -m 8 -n 1000 -d $MNT/fsstress.2
+
+	mkdir $MNT/fsstress.3
+	echo -n "    fsstress.3 "
+	$FSSTRESS -p 4 -z -f rmdir=10 -f link=10 -f creat=10 -f mkdir=10 -f rename=30 -f stat=30 -f unlink=30 -f truncate=20 -m 8 -n 1000 -d $MNT/fsstress.3
+
+	echo "    rm"
+	rm -R $MNT/*
+
+	let N=$N+1
+done
+