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0007490e09
to 'Size' (that is, size_t), and install overflow detection checks in it. This allows us to remove the former arbitrary restrictions on NBuffers etc. It won't make any difference in a 32-bit machine, but in a 64-bit machine you could theoretically have terabytes of shared buffers. (How efficiently we could manage 'em remains to be seen.) Similarly, num_temp_buffers, work_mem, and maintenance_work_mem can be set above 2Gb on a 64-bit machine. Original patch from Koichi Suzuki, additional work by moi.
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* freespace.h
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* POSTGRES free space map for quickly finding free space in relations
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*
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*
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/storage/freespace.h,v 1.18 2005/08/20 23:26:33 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef FREESPACE_H_
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#define FREESPACE_H_
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#include "storage/block.h"
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#include "storage/relfilenode.h"
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/*
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* exported types
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*/
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typedef struct PageFreeSpaceInfo
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{
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BlockNumber blkno; /* which page in relation */
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Size avail; /* space available on this page */
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} PageFreeSpaceInfo;
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/* GUC variables */
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extern int MaxFSMRelations;
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extern int MaxFSMPages;
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/*
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* function prototypes
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*/
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extern void InitFreeSpaceMap(void);
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extern Size FreeSpaceShmemSize(void);
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extern BlockNumber GetPageWithFreeSpace(RelFileNode *rel, Size spaceNeeded);
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extern BlockNumber RecordAndGetPageWithFreeSpace(RelFileNode *rel,
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BlockNumber oldPage,
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Size oldSpaceAvail,
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Size spaceNeeded);
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extern Size GetAvgFSMRequestSize(RelFileNode *rel);
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extern void RecordRelationFreeSpace(RelFileNode *rel,
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int nPages,
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PageFreeSpaceInfo *pageSpaces);
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extern BlockNumber GetFreeIndexPage(RelFileNode *rel);
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extern void RecordIndexFreeSpace(RelFileNode *rel,
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int nPages,
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BlockNumber *pages);
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extern void FreeSpaceMapTruncateRel(RelFileNode *rel, BlockNumber nblocks);
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extern void FreeSpaceMapForgetRel(RelFileNode *rel);
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extern void FreeSpaceMapForgetDatabase(Oid dbid);
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extern void PrintFreeSpaceMapStatistics(int elevel);
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extern void DumpFreeSpaceMap(int code, Datum arg);
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extern void LoadFreeSpaceMap(void);
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#ifdef FREESPACE_DEBUG
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extern void DumpFreeSpace(void);
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#endif
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#endif /* FREESPACE_H */
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