Add test for multipath and make it work.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>

Create.c

@@ -252,7 +252,7 @@ int Create(struct supertype *st, char *mddev, int mdfd,
 			fprintf(stderr, Name ": no size and no drives given - aborting create.\n");
 			return 1;
 		}
-		if (level > 0) {
+		if (level > 0 || level == LEVEL_MULTIPATH || level == LEVEL_FAULTY) {
 			/* size is meaningful */
 			if (minsize > 0x100000000ULL) {
 				fprintf(stderr, Name ": devices too large for RAID level %d\n", level);	

test

@@ -42,11 +42,19 @@ devlist=
 for d in 0 1 2 3 4 5 6 7
 do
    [ -f $targetdir/mdtest$d ] || dd if=/dev/zero of=$targetdir/mdtest$d count=$size bs=1K > /dev/null 2>&1
-   losetup /dev/loop$d $targetdir/mdtest$d
+   if [ $d -eq 7 ]
+   then
+     losetup /dev/loop$d $targetdir/mdtest6 # for multipath use
+   else
+     losetup /dev/loop$d $targetdir/mdtest$d
+   fi
    eval dev$d=/dev/loop$d
    eval file$d=$targetdir/mdtest$d
    eval devlist=\"\$devlist \$dev$d\"
 done
+path0=$dev6
+path1=$dev7
+
 
 # mdadm always adds --quiet, and we want to see any unexpected messages
 mdadm() {
@@ -119,6 +127,11 @@ testdev() {
    fi
 }
 
+rotest() {
+  dev=$1
+  fsck -fn $dev >&2
+}
+
 
 
 for script in tests/$prefix*[^~]

tests/00multipath

@@ -0,0 +1,24 @@
+
+#
+# create a multipath, and fail and stuff
+
+mdadm -CR $md1 -l multipath -n2 $path0 $path1
+
+testdev $md1 1 $mdsize0 1
+
+mdadm $md1 -f $path0
+rotest $md1
+testdev $md1 1 $mdsize0 1
+
+mdadm $md1 -r $path0
+mdadm $md1 -a $path0
+
+rotest $md1
+testdev $md1 1 $mdsize0 1
+
+mdadm $md1 -f $path1
+mdadm $md1 -r $path1
+rotest $md1
+testdev $md1 1 $mdsize0 1
+
+mdadm -S $md1