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