rem: resolve_mount_point_to_volume_root(struct vnode *vnode)
add: resolve_mount_point_to_volume_root(mount_id mountID, vnode_id nodeID, mount_id *resolvedMountID, vnode_id *resolvedNodeID)
context: resolve_mount_point_to_volume_root(struct vnode *vnode){	if (!vnode)		return NULL;	struct vnode *volumeRoot = NULL;	recursive_lock_lock(&sMountOpLock);	if (vnode->covered_by) {		volumeRoot = vnode->covered_by;		inc_vnode_ref_count(volumeRoot);	}	recursive_lock_unlock(&sMountOpLock);	return volumeRoot;}