From b9c3c7a2f462febcbfdc6d8c0bc19be6ac6350c0 Mon Sep 17 00:00:00 2001
From: Brian Behlendorf <behlendorf1@llnl.gov>
Date: Tue, 21 Jul 2009 16:17:54 -0700
Subject: [PATCH] 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                 | 12 ++++++++++++
 scripts/zpool-config/lo-raid0.sh  |  2 +-
 scripts/zpool-config/lo-raid10.sh |  2 +-
 scripts/zpool-config/lo-raidz.sh  |  2 +-
 scripts/zpool-config/lo-raidz2.sh |  2 +-
 5 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/scripts/common.sh b/scripts/common.sh
index fdb9b947c5..6e19bbf83d 100755
--- a/scripts/common.sh
+++ b/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"
+}
diff --git a/scripts/zpool-config/lo-raid0.sh b/scripts/zpool-config/lo-raid0.sh
index 84c355266c..36b3c4d62f 100644
--- a/scripts/zpool-config/lo-raid0.sh
+++ b/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 ||
diff --git a/scripts/zpool-config/lo-raid10.sh b/scripts/zpool-config/lo-raid10.sh
index 78004cc545..ce528004c7 100644
--- a/scripts/zpool-config/lo-raid10.sh
+++ b/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 ||
diff --git a/scripts/zpool-config/lo-raidz.sh b/scripts/zpool-config/lo-raidz.sh
index cac9036464..616c364bed 100644
--- a/scripts/zpool-config/lo-raidz.sh
+++ b/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 ||
diff --git a/scripts/zpool-config/lo-raidz2.sh b/scripts/zpool-config/lo-raidz2.sh
index bd9a40ce58..dbd7d815eb 100644
--- a/scripts/zpool-config/lo-raidz2.sh
+++ b/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 ||