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The local buffer manager is no longer used for newly-created relations (unless they are TEMP); a new non-TEMP relation goes through the shared bufmgr and thus will participate normally in checkpoints. But TEMP relations use the local buffer manager throughout their lifespan. Also, operations in TEMP relations are not logged in WAL, thus improving performance. Since it's no longer necessary to fsync relations as they move out of the local buffers into shared buffers, quite a lot of smgr.c/md.c/fd.c code is no longer needed and has been removed: there's no concept of a dirty relation anymore in md.c/fd.c, and we never fsync anything but WAL. Still TODO: improve local buffer management algorithms so that it would be reasonable to increase NLocBuffer.
96 lines
3.2 KiB
C
96 lines
3.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* smgr.h
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* storage manager switch public interface declarations.
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*
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*
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* Portions Copyright (c) 1996-2002, 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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* $Id: smgr.h,v 1.36 2002/08/06 02:36:35 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SMGR_H
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#define SMGR_H
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#include "access/xlog.h"
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#include "storage/relfilenode.h"
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#include "storage/block.h"
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#include "utils/rel.h"
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#define SM_FAIL 0
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#define SM_SUCCESS 1
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#define DEFAULT_SMGR 0
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extern int smgrinit(void);
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extern int smgrcreate(int16 which, Relation reln);
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extern int smgrunlink(int16 which, Relation reln);
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extern int smgrextend(int16 which, Relation reln, BlockNumber blocknum,
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char *buffer);
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extern int smgropen(int16 which, Relation reln, bool failOK);
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extern int smgrclose(int16 which, Relation reln);
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extern int smgrread(int16 which, Relation reln, BlockNumber blocknum,
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char *buffer);
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extern int smgrwrite(int16 which, Relation reln, BlockNumber blocknum,
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char *buffer);
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extern int smgrblindwrt(int16 which, RelFileNode rnode,
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BlockNumber blkno, char *buffer);
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extern BlockNumber smgrnblocks(int16 which, Relation reln);
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extern BlockNumber smgrtruncate(int16 which, Relation reln,
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BlockNumber nblocks);
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extern int smgrDoPendingDeletes(bool isCommit);
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extern int smgrcommit(void);
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extern int smgrabort(void);
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extern int smgrsync(void);
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extern void smgr_redo(XLogRecPtr lsn, XLogRecord *record);
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extern void smgr_undo(XLogRecPtr lsn, XLogRecord *record);
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extern void smgr_desc(char *buf, uint8 xl_info, char *rec);
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/* internals: move me elsewhere -- ay 7/94 */
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/* in md.c */
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extern int mdinit(void);
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extern int mdcreate(Relation reln);
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extern int mdunlink(RelFileNode rnode);
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extern int mdextend(Relation reln, BlockNumber blocknum, char *buffer);
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extern int mdopen(Relation reln);
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extern int mdclose(Relation reln);
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extern int mdread(Relation reln, BlockNumber blocknum, char *buffer);
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extern int mdwrite(Relation reln, BlockNumber blocknum, char *buffer);
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extern int mdblindwrt(RelFileNode rnode, BlockNumber blkno, char *buffer);
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extern BlockNumber mdnblocks(Relation reln);
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extern BlockNumber mdtruncate(Relation reln, BlockNumber nblocks);
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extern int mdcommit(void);
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extern int mdabort(void);
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extern int mdsync(void);
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/* mm.c */
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extern int mminit(void);
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extern int mmcreate(Relation reln);
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extern int mmunlink(RelFileNode rnode);
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extern int mmextend(Relation reln, BlockNumber blocknum, char *buffer);
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extern int mmopen(Relation reln);
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extern int mmclose(Relation reln);
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extern int mmread(Relation reln, BlockNumber blocknum, char *buffer);
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extern int mmwrite(Relation reln, BlockNumber blocknum, char *buffer);
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extern int mmblindwrt(RelFileNode rnode, BlockNumber blkno, char *buffer);
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extern BlockNumber mmnblocks(Relation reln);
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extern BlockNumber mmtruncate(Relation reln, BlockNumber nblocks);
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extern int mmcommit(void);
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extern int mmabort(void);
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extern int mmshutdown(void);
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extern int MMShmemSize(void);
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/* smgrtype.c */
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extern Datum smgrout(PG_FUNCTION_ARGS);
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extern Datum smgrin(PG_FUNCTION_ARGS);
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extern Datum smgreq(PG_FUNCTION_ARGS);
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extern Datum smgrne(PG_FUNCTION_ARGS);
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#endif /* SMGR_H */
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