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/*-------------------------------------------------------------------------
*
* freespace.h
* POSTGRES free space map for quickly finding free space in relations
*
*
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/freespace.h,v 1.18 2005/08/20 23:26:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef FREESPACE_H_
#define FREESPACE_H_
#include "storage/block.h"
#include "storage/relfilenode.h"
/*
* exported types
*/
typedef struct PageFreeSpaceInfo
{
BlockNumber blkno; /* which page in relation */
Size avail; /* space available on this page */
} PageFreeSpaceInfo;
/* GUC variables */
extern int MaxFSMRelations;
extern int MaxFSMPages;
/*
* function prototypes
*/
extern void InitFreeSpaceMap(void);
extern Size FreeSpaceShmemSize(void);
extern BlockNumber GetPageWithFreeSpace(RelFileNode *rel, Size spaceNeeded);
extern BlockNumber RecordAndGetPageWithFreeSpace(RelFileNode *rel,
BlockNumber oldPage,
Size oldSpaceAvail,
Size spaceNeeded);
extern Size GetAvgFSMRequestSize(RelFileNode *rel);
extern void RecordRelationFreeSpace(RelFileNode *rel,
int nPages,
PageFreeSpaceInfo *pageSpaces);
extern BlockNumber GetFreeIndexPage(RelFileNode *rel);
extern void RecordIndexFreeSpace(RelFileNode *rel,
int nPages,
BlockNumber *pages);
extern void FreeSpaceMapTruncateRel(RelFileNode *rel, BlockNumber nblocks);
extern void FreeSpaceMapForgetRel(RelFileNode *rel);
extern void FreeSpaceMapForgetDatabase(Oid dbid);
extern void PrintFreeSpaceMapStatistics(int elevel);
extern void DumpFreeSpaceMap(int code, Datum arg);
extern void LoadFreeSpaceMap(void);
#ifdef FREESPACE_DEBUG
extern void DumpFreeSpace(void);
#endif
#endif /* FREESPACE_H */
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