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Introduce the concept of relation forks. An smgr relation can now consist

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of multiple forks, and each fork can be created and grown separately.

The bulk of this patch is about changing the smgr API to include an extra
ForkNumber argument in every smgr function. Also, smgrscheduleunlink and
smgrdounlink no longer implicitly call smgrclose, because other forks might
still exist after unlinking one. The callers of those functions have been
modified to call smgrclose instead.

This patch in itself doesn't have any user-visible effect, but provides the
infrastructure needed for upcoming patches. The additional forks envisioned
are a rewritten FSM implementation that doesn't rely on a fixed-size shared
memory block, and a visibility map to allow skipping portions of a table in
VACUUM that have no dead tuples.
This commit is contained in:
Heikki Linnakangas
2008-08-11 11:05:11 +00:00
parent eca1388629
commit 3f0e808c4a
31 changed files with 733 additions and 446 deletions
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66
src/include/storage/smgr.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/smgr.h,v 1.62 2008/01/01 19:45:59 momjian Exp $
* $PostgreSQL: pgsql/src/include/storage/smgr.h,v 1.63 2008/08/11 11:05:11 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@@ -51,7 +51,8 @@ typedef struct SMgrRelationData
*/
int smgr_which; /* storage manager selector */
struct _MdfdVec *md_fd; /* for md.c; NULL if not open */
/* for md.c; NULL for forks that are not open */
struct _MdfdVec *md_fd[MAX_FORKNUM + 1];
} SMgrRelationData;
typedef SMgrRelationData *SMgrRelation;
@@ -59,24 +60,29 @@ typedef SMgrRelationData *SMgrRelation;
extern void smgrinit(void);
extern SMgrRelation smgropen(RelFileNode rnode);
extern bool smgrexists(SMgrRelation reln, ForkNumber forknum);
extern void smgrsetowner(SMgrRelation *owner, SMgrRelation reln);
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,
bool isTemp);
extern void smgrread(SMgrRelation reln, BlockNumber blocknum, char *buffer);
extern void smgrwrite(SMgrRelation reln, BlockNumber blocknum, char *buffer,
bool isTemp);
extern BlockNumber smgrnblocks(SMgrRelation reln);
extern void smgrtruncate(SMgrRelation reln, BlockNumber nblocks,
bool isTemp);
extern void smgrimmedsync(SMgrRelation reln);
extern void smgrcreate(SMgrRelation reln, ForkNumber forknum,
bool isTemp, bool isRedo);
extern void smgrscheduleunlink(SMgrRelation reln, ForkNumber forknum,
bool isTemp);
extern void smgrdounlink(SMgrRelation reln, ForkNumber forknum,
bool isTemp, bool isRedo);
extern void smgrextend(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum, char *buffer, bool isTemp);
extern void smgrread(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum, char *buffer);
extern void smgrwrite(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum, char *buffer, bool isTemp);
extern BlockNumber smgrnblocks(SMgrRelation reln, ForkNumber forknum);
extern void smgrtruncate(SMgrRelation reln, ForkNumber forknum,
BlockNumber nblocks, bool isTemp);
extern void smgrimmedsync(SMgrRelation reln, ForkNumber forknum);
extern void smgrDoPendingDeletes(bool isCommit);
extern int smgrGetPendingDeletes(bool forCommit, RelFileNode **ptr,
extern int smgrGetPendingDeletes(bool forCommit, RelFileFork **ptr,
bool *haveNonTemp);
extern void AtSubCommit_smgr(void);
extern void AtSubAbort_smgr(void);
@@ -95,23 +101,27 @@ extern void smgr_desc(StringInfo buf, uint8 xl_info, char *rec);
/* in md.c */
extern void mdinit(void);
extern void mdclose(SMgrRelation reln);
extern void mdcreate(SMgrRelation reln, bool isRedo);
extern void mdunlink(RelFileNode rnode, bool isRedo);
extern void mdextend(SMgrRelation reln, BlockNumber blocknum, char *buffer,
bool isTemp);
extern void mdread(SMgrRelation reln, BlockNumber blocknum, char *buffer);
extern void mdwrite(SMgrRelation reln, BlockNumber blocknum, char *buffer,
bool isTemp);
extern BlockNumber mdnblocks(SMgrRelation reln);
extern void mdtruncate(SMgrRelation reln, BlockNumber nblocks, bool isTemp);
extern void mdimmedsync(SMgrRelation reln);
extern void mdclose(SMgrRelation reln, ForkNumber forknum);
extern void mdcreate(SMgrRelation reln, ForkNumber forknum, bool isRedo);
extern bool mdexists(SMgrRelation reln, ForkNumber forknum);
extern void mdunlink(RelFileNode rnode, ForkNumber forknum, bool isRedo);
extern void mdextend(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum, char *buffer, bool isTemp);
extern void mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
char *buffer);
extern void mdwrite(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum, char *buffer, bool isTemp);
extern BlockNumber mdnblocks(SMgrRelation reln, ForkNumber forknum);
extern void mdtruncate(SMgrRelation reln, ForkNumber forknum,
BlockNumber nblocks, bool isTemp);
extern void mdimmedsync(SMgrRelation reln, ForkNumber forknum);
extern void mdpreckpt(void);
extern void mdsync(void);
extern void mdpostckpt(void);
extern void RememberFsyncRequest(RelFileNode rnode, BlockNumber segno);
extern void ForgetRelationFsyncRequests(RelFileNode rnode);
extern void RememberFsyncRequest(RelFileNode rnode, ForkNumber forknum,
BlockNumber segno);
extern void ForgetRelationFsyncRequests(RelFileNode rnode, ForkNumber forknum);
extern void ForgetDatabaseFsyncRequests(Oid dbid);
/* smgrtype.c */