rem: struct vnode *vnode = descriptor->vnode;
add: struct vnode *vnode = descriptor->u.vnode;
context: common_ioctl(struct file_descriptor *descriptor, ulong op, void *buffer, size_t length){	struct vnode *vnode = descriptor->vnode;	if (FS_CALL(vnode, ioctl))		return FS_CALL(vnode, ioctl)(vnode->mount->cookie,vnode->private_node,descriptor->cookie,op,buffer,length);	return EOPNOTSUPP;}