Add the number of priority groups to the dm-multipath constructor string. This
should make parsing the string a bit simpler.  [Kevin Corry]
--- diff/drivers/md/dm-mpath.c	2004-01-16 14:41:56.000000000 +0000
+++ source/drivers/md/dm-mpath.c	2004-01-16 16:38:04.000000000 +0000
@@ -313,8 +313,8 @@
 
 /*-----------------------------------------------------------------
  * Constructor/argument parsing:
- * <poll interval??> [<priority> <selector> <selector args>
- * <num paths> [<path> <arg>]]
+ * <poll interval> <num priority groups> [<priority> <selector>
+ * <num selector args> <num paths> [<path> [<arg>]* ]+ ]+
  *---------------------------------------------------------------*/
 struct param {
 	unsigned min;
@@ -535,9 +535,10 @@
 	/* target parameters */
 	static struct param _params[] = {
 		{1, 60 * 60, ESTR("invalid path test interval")},
+		{1, 1024, ESTR("invalid number of priority groups")},
 	};
 
-	int r;
+	int r, pg_count;
 	struct multipath *m;
 	struct arg_set as;
 
@@ -554,6 +555,10 @@
 	if (r)
 		goto bad;
 
+	r = read_param(_params + 1, shift(&as), &pg_count, &ti->error);
+	if (r)
+		goto bad;
+
 	/* parse the priority groups */
 	while (as.argc) {
 		struct priority_group *pg;