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Restructure smgr API as per recent proposal. smgr no longer depends on

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the relcache, and so the notion of 'blind write' is gone.  This should
improve efficiency in bgwriter and background checkpoint processes.
Internal restructuring in md.c to remove the not-very-useful array of
MdfdVec objects --- might as well just use pointers.
Also remove the long-dead 'persistent main memory' storage manager (mm.c),
since it seems quite unlikely to ever get resurrected.
This commit is contained in:
Tom Lane
2004-02-10 01:55:27 +00:00
parent f06e79525a
commit 87bd956385
37 changed files with 933 additions and 1776 deletions
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114
src/include/storage/smgr.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/smgr.h,v 1.39 2003/11/29 22:41:13 pgsql Exp $
* $PostgreSQL: pgsql/src/include/storage/smgr.h,v 1.40 2004/02/10 01:55:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -16,36 +16,54 @@
#include "access/xlog.h"
#include "fmgr.h"
#include "storage/relfilenode.h"
#include "storage/block.h"
#include "utils/rel.h"
#include "storage/relfilenode.h"
#define SM_FAIL 0
#define SM_SUCCESS 1
/*
* smgr.c maintains a table of SMgrRelation objects, which are essentially
* cached file handles. An SMgrRelation is created (if not already present)
* by smgropen(), and destroyed by smgrclose(). Note that neither of these
* operations imply I/O, they just create or destroy a hashtable entry.
* (But smgrclose() may release associated resources, such as OS-level file
* descriptors.)
*/
typedef struct SMgrRelationData
{
/* rnode is the hashtable lookup key, so it must be first! */
RelFileNode smgr_rnode; /* relation physical identifier */
#define DEFAULT_SMGR 0
/* additional public fields may someday exist here */
extern int smgrinit(void);
extern int smgrcreate(int16 which, Relation reln);
extern int smgrunlink(int16 which, Relation reln);
extern int smgrextend(int16 which, Relation reln, BlockNumber blocknum,
char *buffer);
extern int smgropen(int16 which, Relation reln, bool failOK);
extern int smgrclose(int16 which, Relation reln);
extern int smgrread(int16 which, Relation reln, BlockNumber blocknum,
char *buffer);
extern int smgrwrite(int16 which, Relation reln, BlockNumber blocknum,
char *buffer);
extern int smgrblindwrt(int16 which, RelFileNode rnode,
BlockNumber blkno, char *buffer);
extern BlockNumber smgrnblocks(int16 which, Relation reln);
extern BlockNumber smgrtruncate(int16 which, Relation reln,
BlockNumber nblocks);
extern int smgrDoPendingDeletes(bool isCommit);
extern int smgrcommit(void);
extern int smgrabort(void);
extern int smgrsync(void);
/*
* Fields below here are intended to be private to smgr.c and its
* submodules. Do not touch them from elsewhere.
*/
int smgr_which; /* storage manager selector */
struct _MdfdVec *md_fd; /* for md.c; NULL if not open */
} SMgrRelationData;
typedef SMgrRelationData *SMgrRelation;
extern void smgrinit(void);
extern SMgrRelation smgropen(RelFileNode rnode);
extern void smgrclose(SMgrRelation reln);
extern void smgrcloseall(void);
extern void smgrclosenode(RelFileNode rnode);
extern void smgrcreate(SMgrRelation reln, bool isTemp, bool isRedo);
extern void smgrscheduleunlink(SMgrRelation reln, bool isTemp);
extern void smgrdounlink(SMgrRelation reln, bool isTemp, bool isRedo);
extern void smgrextend(SMgrRelation reln, BlockNumber blocknum, char *buffer);
extern void smgrread(SMgrRelation reln, BlockNumber blocknum, char *buffer);
extern void smgrwrite(SMgrRelation reln, BlockNumber blocknum, char *buffer);
extern BlockNumber smgrnblocks(SMgrRelation reln);
extern BlockNumber smgrtruncate(SMgrRelation reln, BlockNumber nblocks);
extern void smgrDoPendingDeletes(bool isCommit);
extern void smgrcommit(void);
extern void smgrabort(void);
extern void smgrsync(void);
extern void smgr_redo(XLogRecPtr lsn, XLogRecord *record);
extern void smgr_undo(XLogRecPtr lsn, XLogRecord *record);
@@ -55,38 +73,18 @@ extern void smgr_desc(char *buf, uint8 xl_info, char *rec);
/* internals: move me elsewhere -- ay 7/94 */
/* in md.c */
extern int mdinit(void);
extern int mdcreate(Relation reln);
extern int mdunlink(RelFileNode rnode);
extern int mdextend(Relation reln, BlockNumber blocknum, char *buffer);
extern int mdopen(Relation reln);
extern int mdclose(Relation reln);
extern int mdread(Relation reln, BlockNumber blocknum, char *buffer);
extern int mdwrite(Relation reln, BlockNumber blocknum, char *buffer);
extern int mdblindwrt(RelFileNode rnode, BlockNumber blkno, char *buffer);
extern BlockNumber mdnblocks(Relation reln);
extern BlockNumber mdtruncate(Relation reln, BlockNumber nblocks);
extern int mdcommit(void);
extern int mdabort(void);
extern int mdsync(void);
/* mm.c */
extern int mminit(void);
extern int mmcreate(Relation reln);
extern int mmunlink(RelFileNode rnode);
extern int mmextend(Relation reln, BlockNumber blocknum, char *buffer);
extern int mmopen(Relation reln);
extern int mmclose(Relation reln);
extern int mmread(Relation reln, BlockNumber blocknum, char *buffer);
extern int mmwrite(Relation reln, BlockNumber blocknum, char *buffer);
extern int mmblindwrt(RelFileNode rnode, BlockNumber blkno, char *buffer);
extern BlockNumber mmnblocks(Relation reln);
extern BlockNumber mmtruncate(Relation reln, BlockNumber nblocks);
extern int mmcommit(void);
extern int mmabort(void);
extern int mmshutdown(void);
extern int MMShmemSize(void);
extern bool mdinit(void);
extern bool mdclose(SMgrRelation reln);
extern bool mdcreate(SMgrRelation reln, bool isRedo);
extern bool mdunlink(RelFileNode rnode, bool isRedo);
extern bool mdextend(SMgrRelation reln, BlockNumber blocknum, char *buffer);
extern bool mdread(SMgrRelation reln, BlockNumber blocknum, char *buffer);
extern bool mdwrite(SMgrRelation reln, BlockNumber blocknum, char *buffer);
extern BlockNumber mdnblocks(SMgrRelation reln);
extern BlockNumber mdtruncate(SMgrRelation reln, BlockNumber nblocks);
extern bool mdcommit(void);
extern bool mdabort(void);
extern bool mdsync(void);
/* smgrtype.c */
extern Datum smgrout(PG_FUNCTION_ARGS);