rem: FS_CALL(vnode,fs_free_cookie)(vnode->mount->cookie, vnode->private_node, descriptor->cookie);
add: FS_CALL(vnode, free_cookie)(vnode->mount->cookie, vnode->private_node, descriptor->cookie);
context: file_free_fd(struct file_descriptor *descriptor){	struct vnode *vnode = descriptor->vnode;	if (vnode != NULL) {		FS_CALL(vnode,fs_free_cookie)(vnode->mount->cookie, vnode->private_node, descriptor->cookie);		dec_vnode_ref_count(vnode, false);	}}