benchmark.bash: add support for go-fuse loopback

Make testing the performance of the new nodefs API easier

https://github.com/hanwen/go-fuse/pull/280

benchmark.bash

@@ -12,6 +12,7 @@ function usage {
 }
 
 OPT_ENCFS=0
+OPT_LOOPBACK=0
 OPT_OPENSSL=""
 OPT_DIR=""
 DD_ONLY=""
@@ -34,6 +35,9 @@ while [[ $# -gt 0 ]] ; do
 		-dd)
 			DD_ONLY=1
 			;;
+		-loopback)
+			OPT_LOOPBACK=1
+			;;
 		-*)
 			echo "Invalid option: $1"
 			usage
@@ -69,6 +73,10 @@ if [[ $OPT_ENCFS -eq 1 ]]; then
 	echo -n "Testing EncFS at $CRYPT: "
 	encfs --version
 	/home/jakob.donotbackup/encfs/build/encfs --extpass="echo test" --standard $CRYPT $MNT > /dev/null
+elif [[ $OPT_LOOPBACK -eq 1 ]]; then
+	echo "Testing go-fuse loopback"
+	$HOME/go/src/github.com/hanwen/go-fuse/example/loopback/loopback $MNT $CRYPT &
+	sleep 0.5
 else
 	echo -n "Testing gocryptfs at $CRYPT: "
 	gocryptfs -version
@@ -76,13 +84,18 @@ else
 	gocryptfs -q -extpass="echo test" $OPT_OPENSSL $CRYPT $MNT
 fi
 
+# Make sure we have actually mounted something
+if ! mountpoint $MNT ; then
+	exit 1
+fi
+
 # Cleanup trap
 trap "cd /; fuse-unmount -z $MNT; rm -rf $CRYPT $MNT" EXIT
 
 # Benchmarks
 if [[ $DD_ONLY -eq 1 ]]; then
 	echo -n "WRITE: "
-	dd if=/dev/zero of=$MNT/zero bs=131072 count=2000 2>&1 | tail -n 1
+	dd if=/dev/zero of=$MNT/zero bs=131072 count=20000 2>&1 | tail -n 1
 	rm $MNT/zero
 else
 	./tests/canonical-benchmarks.bash $MNT