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/*-------------------------------------------------------------------------
*
* freespace.h
* POSTGRES free space map for quickly finding free space in relations
*
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: freespace.h,v 1.2 2001/07/02 20:50:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef FREESPACE_H_
#define FREESPACE_H_
#include "storage/block.h"
#include "storage/relfilenode.h"
#include "storage/spin.h"
extern SPINLOCK FreeSpaceLock;
extern int MaxFSMRelations;
extern int MaxFSMPages;
/*
* function prototypes
*/
extern void InitFreeSpaceMap(void);
extern int FreeSpaceShmemSize(void);
extern BlockNumber GetPageWithFreeSpace(RelFileNode *rel, Size spaceNeeded);
extern void RecordFreeSpace(RelFileNode *rel, BlockNumber page,
Size spaceAvail);
extern BlockNumber RecordAndGetPageWithFreeSpace(RelFileNode *rel,
BlockNumber oldPage,
Size oldSpaceAvail,
Size spaceNeeded);
extern void MultiRecordFreeSpace(RelFileNode *rel,
BlockNumber minPage,
BlockNumber maxPage,
int nPages,
BlockNumber *pages,
Size *spaceAvail);
extern void FreeSpaceMapForgetRel(RelFileNode *rel);
extern void FreeSpaceMapForgetDatabase(Oid dbid);
#ifdef FREESPACE_DEBUG
extern void DumpFreeSpace(void);
#endif
#endif /* FREESPACE_H */
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