tests: add fsstress-encfs.sh stress test

Mount an EncFS filesystem in /tmp and run fsstress against it
in an infinite loop, only exiting on errors.

Ported over from gocryptfs
( ccf1a84e41/tests/stress_tests/fsstress-gocryptfs.bash )

tests/stress_tests/fsstress-encfs.sh

@@ -0,0 +1,74 @@
+#!/bin/bash -eu
+#
+# Mount an EncFS filesystem in /tmp and run fsstress against it
+# in an infinite loop, only exiting on errors.
+#
+# You need to have https://github.com/rfjakob/fuse-xfstests or
+# https://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git
+# (which fsstress) downloaded and compiled at $HOME/fuse-xfststs .
+
+cd "$(dirname "$0")"
+MYNAME=$(basename $0)
+
+# fsstress binary
+FSSTRESS=$HOME/fuse-xfstests/ltp/fsstress
+if [ ! -x $FSSTRESS ]
+then
+	echo "$MYNAME: fsstress binary not found at $FSSTRESS"
+	echo "Please clone and compile https://github.com/rfjakob/fuse-xfstests"
+	exit 1
+fi
+
+# Backing directory
+DIR=$(mktemp -d /tmp/fsstress-encfs.XXX)
+# Mountpoint
+MNT="$DIR.mnt"
+mkdir $MNT
+
+# Mount
+../../build/encfs -f --extpass "echo test" --standard $DIR $MNT &
+disown
+
+sleep 0.5
+echo -n "Waiting for mount: "
+while ! grep "$MNT fuse" /proc/self/mounts > /dev/null
+do
+	sleep 1
+	echo -n x
+done
+echo " ok"
+
+# Cleanup trap
+trap "kill %1 ; cd / ; fusermount -u -z $MNT ; rm -rf $DIR $MNT" EXIT
+
+echo "Starting fsstress loop"
+N=1
+while true
+do
+	# Note: EncFS does not seem to support the FS_IOC_GETFLAGS ioctl that
+	# fsstress is using. To get rid of the error messages we set "-f getattr=0"
+	# in all fsstress calls.
+	echo $N
+	mkdir $MNT/fsstress.1
+	echo -n "    fsstress.1 "
+	$FSSTRESS -r -m 8 -n 1000 -d $MNT/fsstress.1 -f getattr=0 &
+	wait
+
+	mkdir $MNT/fsstress.2
+	echo -n "    fsstress.2 "
+	$FSSTRESS -p 20 -r -m 8 -n 1000 -d $MNT/fsstress.2 -f getattr=0 &
+	wait
+
+	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 -f getattr=0 &
+	wait
+
+	echo "    rm"
+	rm -R $MNT/*
+
+	let N=$N+1
+done
+