1 /*-------------------------------------------------------------------------
2  *
3  * freespace.h
4  *	  POSTGRES free space map for quickly finding free space in relations
5  *
6  *
7  * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
8  * Portions Copyright (c) 1994, Regents of the University of California
9  *
10  * src/include/storage/freespace.h
11  *
12  *-------------------------------------------------------------------------
13  */
14 #ifndef FREESPACE_H_
15 #define FREESPACE_H_
16 
17 #include "storage/block.h"
18 #include "storage/relfilenode.h"
19 #include "utils/relcache.h"
20 
21 /* prototypes for public functions in freespace.c */
22 extern Size GetRecordedFreeSpace(Relation rel, BlockNumber heapBlk);
23 extern BlockNumber GetPageWithFreeSpace(Relation rel, Size spaceNeeded);
24 extern BlockNumber RecordAndGetPageWithFreeSpace(Relation rel,
25 												 BlockNumber oldPage,
26 												 Size oldSpaceAvail,
27 												 Size spaceNeeded);
28 extern void RecordPageWithFreeSpace(Relation rel, BlockNumber heapBlk,
29 									Size spaceAvail);
30 extern void XLogRecordPageWithFreeSpace(RelFileNode rnode, BlockNumber heapBlk,
31 										Size spaceAvail);
32 
33 extern BlockNumber FreeSpaceMapPrepareTruncateRel(Relation rel,
34 												  BlockNumber nblocks);
35 extern void FreeSpaceMapVacuum(Relation rel);
36 extern void FreeSpaceMapVacuumRange(Relation rel, BlockNumber start,
37 									BlockNumber end);
38 
39 #endif							/* FREESPACE_H_ */
40