xen/blkback: Prefix 'vbd' with 'xen' in structs and functions.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
index 722c048..1e4ccde 100644
--- a/drivers/block/xen-blkback/common.h
+++ b/drivers/block/xen-blkback/common.h
@@ -113,7 +113,7 @@
 	BLKIF_PROTOCOL_X86_64 = 3,
 };
 
-struct vbd {
+struct xen_vbd {
 	/* What the domain refers to this vbd as. */
 	blkif_vdev_t		handle;
 	/* Non-zero -> read-only */
@@ -141,7 +141,7 @@
 	union blkif_back_rings	blk_rings;
 	struct vm_struct	*blk_ring_area;
 	/* The VBD attached to this interface. */
-	struct vbd		vbd;
+	struct xen_vbd		vbd;
 	/* Back pointer to the backend_info. */
 	struct backend_info	*be;
 	/* Private fields. */