rem: new_file_fd(struct vnode *vnode, file_cookie cookie, int openMode, bool kernel)
add: new_file_fd(struct vnode *vnode, fs_cookie cookie, int openMode, bool kernel)
context: new_file_fd(struct vnode *vnode, file_cookie cookie, int openMode, bool kernel){	struct file_descriptor *descriptor;	int fd;	descriptor = alloc_fd();	if (!descriptor)		return ENOMEM;	descriptor->vnode = vnode;	descriptor->cookie = cookie;	descriptor->ops = &file_ops;	descriptor->type = FDTYPE_FILE;	descriptor->open_mode = openMode;	fd = new_fd(get_current_io_context(kernel), descriptor);	if (fd < 0)		return ERR_VFS_FD_TABLE_FULL;	return fd;}