rem: get_fd_and_vnode(int fd, bool kernel, struct vnode **_vnode)
add: get_fd_and_vnode(int fd, struct vnode **_vnode, bool kernel)
context: get_fd_and_vnode(int fd, bool kernel, struct vnode **_vnode){	struct file_descriptor *descriptor = get_fd(get_current_io_context(kernel), fd);	if (descriptor == NULL)		return NULL;	if (descriptor->vnode == NULL) {		put_fd(descriptor);		return NULL;	}	*_vnode = descriptor->vnode;	return descriptor;}