Check for multipath module before running multipath tests

Some systems do not ship the md multipath module. If not available
simply skip any multipath tests.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>

test

@@ -19,6 +19,12 @@ then
    echo >&2 "test: $mdadm isn't usable."
 fi
 
+# Check whether to run multipath tests
+modprobe multipath 2> /dev/null
+if grep -s 'Personalities : .*multipath' > /dev/null /proc/mdstat ; then
+    MULTIPATH="yes"
+fi
+
 # assume md0, md1, md2 exist in /dev
 md0=/dev/md0 md1=/dev/md1 md2=/dev/md2
 mdp0=/dev/md_d0

tests/00multipath

@@ -2,6 +2,11 @@
 #
 # create a multipath, and fail and stuff
 
+if [ "$MULTIPATH" != "yes" ]; then
+  echo -ne 'skipping... '
+  exit 0
+fi
+
 mdadm -CR $md1 -l multipath -n2 $path0 $path1
 
 testdev $md1 1 $mdsize12 1