dm-raid1.c: Since kcopyd can currently only handle 1 source and up to 8
destinations, enforce a max of 9 mirrors when creating a dm-mirror device.

--- diff/drivers/md/dm-raid1.c	2004-07-01 21:32:56.000000000 +0100
+++ source/drivers/md/dm-raid1.c	2004-07-01 21:34:31.000000000 +0100
@@ -1028,7 +1028,7 @@
 	argc -= args_used;
 
 	if (!argc || sscanf(argv[0], "%u", &nr_mirrors) != 1 ||
-	    nr_mirrors < 2) {
+	    nr_mirrors < 2 || nr_mirrors > KCOPYD_MAX_REGIONS + 1) {
 		ti->error = "dm-mirror: Invalid number of mirrors";
 		dm_destroy_dirty_log(dl);
 		return -EINVAL;