Index: linux/drivers/xen/blkfront/blkfront.c
===================================================================
--- linux.orig/drivers/xen/blkfront/blkfront.c	2010-03-18 15:09:19.000000000 -0600
+++ linux/drivers/xen/blkfront/blkfront.c	2010-03-18 15:13:58.000000000 -0600
@@ -341,6 +341,7 @@ static void connect(struct blkfront_info
 		printk(KERN_INFO "Setting capacity to %Lu\n",
 		       sectors);
 		set_capacity(info->gd, sectors);
+		revalidate_disk(info->gd);
 
 		/* fall through */
 	case BLKIF_STATE_SUSPENDED: