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src/vnode/cache/inc/cache.h

 #if !defined(_TD_CACHE_H_)
 #define _TD_CACHE_H_
 
+#define TD_MIN_CACHE_BLOCK_SIZE 1024*1024    /* 1M */
+#define TD_MAX_CACHE_BLOCK_SIZE 64*1024*1024 /* 64M */
+
 typedef void cache_pool_t;
 
 typedef struct SCacheBlock
 {
-    SCacheBlock *next;
-    SCacheBlock *prev;
+    int32_t blockId;
     char data[];
 } SCacheBlock;
 

src/vnode/common/datastructure/inc/dlist.h

+// A doubly linked list
+#if !defined(_TD_DLIST_H_)
+#define _TD_DLIST_H_
+
+#include <stdint.h>
+
+typedef struct {
+  SListNode *prev;
+  SListNode *next;
+  void *     data;
+} SListNode;
+
+// Doubly linked list
+typedef struct {
+    SListNode *head;
+    SListNode *tail;
+    int32_t length;
+} SDList;
+
+// ----- Set operation
+#define TD_GET_DLIST_LENGTH(pDList) (((SDList *)pDList)->length)
+#define TD_GET_DLIST_HEAD(pDList) (((SDList *)pDList)->head)
+#define TD_GET_DLIST_TAIL(pDList) (((SDList *)pDList)->tail)
+
+#define TD_GET_DLIST_NEXT_NODE(pDNode) (((SListNode *)pDNode)->next)
+#define TD_GET_DLIST_PREV_NODE(pDNode) (((SListNode *)pDNode)->prev)
+#define TD_GET_DLIST_NODE_DATA(pDNode) (((SListNode *)pDNode)->data)
+
+#endif  // _TD_DLIST_H_

src/vnode/tsdb/inc/tsdbCache.h

@@ -4,11 +4,19 @@
 #include <stdint.h>
 
 #include "cache.h"
+#include "dlist.h"
 
+typedef struct {
+  int64_t      blockId;
+  SCacheBlock *pBlock
+} STSDBCacheBlock;
+
+// Use a doublely linked list to implement this
 typedef struct STSDBCache {
-    int64_t blockId;  // A block ID counter
-    SCacheBlock *blockList;
+  int64_t blockId;  // A block ID counter
+  SDList *cacheList;
 } STSDBCache;
 
+STSDBCache *tsdbCreateCache();
 
-#endif // _TD_TSDBCACHE_H_
+#endif  // _TD_TSDBCACHE_H_