The losetup -f option is unavailable for SLES10 use unused_loop_device()

SLES10 ships util-linux-2.12r-35.30 which does not support the -f option
to losetup.  To avoid this problem the unused_loop_device() function was
added which attempts to find an unused loop device by checking each
/dev/loop* device with losetup to see if it is configured.

scripts/common.sh

@@ -143,3 +143,15 @@ unload_modules() {
 
 	return 0
 }
+
+unused_loop_device() {
+	for DEVICE in `ls -1 /dev/loop*`; do
+		losetup $DEVICE &>/dev/null
+		if [ $? -ne 0 ]; then
+			echo $DEVICE
+			return
+		fi
+	done
+
+	die "Error: Unable to find unused loopback device"
+}

scripts/zpool-config/lo-raid0.sh

@@ -11,7 +11,7 @@ DEVICES=""
 
 zpool_create() {
 	for FILE in ${FILES}; do
-		DEVICE=`/sbin/losetup -f`
+		DEVICE=`unused_loop_device`
 		msg "Creating ${FILE} using loopback device ${DEVICE}"
 		rm -f ${FILE} || exit 1
 		dd if=/dev/zero of=${FILE} bs=1024k count=256 &>/dev/null ||

scripts/zpool-config/lo-raid10.sh

@@ -13,7 +13,7 @@ DEVICES_M2=""
 
 zpool_create() {
 	for FILE in ${FILES_M1}; do
-		DEVICE=`/sbin/losetup -f`
+		DEVICE=`unused_loop_device`
 		msg "Creating ${FILE} using loopback device ${DEVICE}"
 		rm -f ${FILE} || exit 1
 		dd if=/dev/zero of=${FILE} bs=1024k count=256 &>/dev/null ||

scripts/zpool-config/lo-raidz.sh

@@ -11,7 +11,7 @@ DEVICES=""
 
 zpool_create() {
 	for FILE in ${FILES}; do
-		DEVICE=`/sbin/losetup -f`
+		DEVICE=`unused_loop_device`
 		msg "Creating ${FILE} using loopback device ${DEVICE}"
 		rm -f ${FILE} || exit 1
 		dd if=/dev/zero of=${FILE} bs=1024k count=256 &>/dev/null ||

scripts/zpool-config/lo-raidz2.sh

@@ -11,7 +11,7 @@ DEVICES=""
 
 zpool_create() {
 	for FILE in ${FILES}; do
-		DEVICE=`/sbin/losetup -f`
+		DEVICE=`unused_loop_device`
 		msg "Creating ${FILE} using loopback device ${DEVICE}"
 		rm -f ${FILE} || exit 1
 		dd if=/dev/zero of=${FILE} bs=1024k count=256 &>/dev/null ||