init

db_include/storage/freespace.h

@@ -0,0 +1,39 @@
+/*-------------------------------------------------------------------------
+ *
+ * freespace.h
+ *	  POSTGRES free space map for quickly finding free space in relations
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/storage/freespace.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef FREESPACE_H_
+#define FREESPACE_H_
+
+#include "storage/block.h"
+#include "storage/relfilenode.h"
+#include "utils/relcache.h"
+
+/* prototypes for public functions in freespace.c */
+extern Size GetRecordedFreeSpace(Relation rel, BlockNumber heapBlk);
+extern BlockNumber GetPageWithFreeSpace(Relation rel, Size spaceNeeded);
+extern BlockNumber RecordAndGetPageWithFreeSpace(Relation rel,
+												 BlockNumber oldPage,
+												 Size oldSpaceAvail,
+												 Size spaceNeeded);
+extern void RecordPageWithFreeSpace(Relation rel, BlockNumber heapBlk,
+									Size spaceAvail);
+extern void XLogRecordPageWithFreeSpace(RelFileNode rnode, BlockNumber heapBlk,
+										Size spaceAvail);
+
+extern BlockNumber FreeSpaceMapPrepareTruncateRel(Relation rel,
+												  BlockNumber nblocks);
+extern void FreeSpaceMapVacuum(Relation rel);
+extern void FreeSpaceMapVacuumRange(Relation rel, BlockNumber start,
+									BlockNumber end);
+
+#endif							/* FREESPACE_H_ */