实现open file cache

internal/utils/linkedlist/item.go

@@ -0,0 +1,14 @@
+// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+
+package linkedlist
+
+type Item struct {
+	prev *Item
+	next *Item
+
+	Value interface{}
+}
+
+func NewItem(value interface{}) *Item {
+	return &Item{Value: value}
+}