diff -NurpP --minimal linux-2.6.17.7-vs2.1.1-rc28.1/drivers/md/dm-ioctl.c linux-2.6.17.7-vs2.1.1-rc28.1.1/drivers/md/dm-ioctl.c
--- linux-2.6.17.7-vs2.1.1-rc28.1/drivers/md/dm-ioctl.c	2006-08-06 06:13:41 +0200
+++ linux-2.6.17.7-vs2.1.1-rc28.1.1/drivers/md/dm-ioctl.c	2006-08-06 08:10:58 +0200
@@ -621,7 +621,8 @@ static struct hash_cell *__find_device_h
 
 	md = dm_get_md(huge_decode_dev(param->dev));
 	if (md) {
-		mdptr = dm_get_mdptr(md);
+		if (vx_check(dm_get_xid(md), VX_WATCH_P|VX_IDENT))
+			mdptr = dm_get_mdptr(md);
 		dm_put(md);
 	}