database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-08-24 09:27:52 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

15
src/include/storage/bufmgr.h
View File

@@ -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/bufmgr.h,v 1.114 2008/06/19 00:46:06 alvherre Exp $
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.115 2008/08/11 11:05:11 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@@ -144,11 +144,13 @@ extern PGDLLIMPORT int32 *LocalRefCount;
* prototypes for functions in bufmgr.c
*/
extern Buffer ReadBuffer(Relation reln, BlockNumber blockNum);
extern Buffer ReadBufferWithFork(Relation reln, ForkNumber forkNum, BlockNumber blockNum);
extern Buffer ReadBufferWithStrategy(Relation reln, BlockNumber blockNum,
BufferAccessStrategy strategy);
extern Buffer ReadOrZeroBuffer(Relation reln, BlockNumber blockNum);
extern Buffer ReadOrZeroBuffer(Relation reln, ForkNumber forkNum,
BlockNumber blockNum);
extern Buffer ReadBufferWithoutRelcache(RelFileNode rnode, bool isTemp,
BlockNumber blockNum, bool zeroPage);
ForkNumber forkNum, BlockNumber blockNum, bool zeroPage);
extern void ReleaseBuffer(Buffer buffer);
extern void UnlockReleaseBuffer(Buffer buffer);
extern void MarkBufferDirty(Buffer buffer);
@@ -169,15 +171,16 @@ extern BlockNumber RelationGetNumberOfBlocks(Relation relation);
extern void RelationTruncate(Relation rel, BlockNumber nblocks);
extern void FlushRelationBuffers(Relation rel);
extern void FlushDatabaseBuffers(Oid dbid);
extern void DropRelFileNodeBuffers(RelFileNode rnode, bool istemp,
BlockNumber firstDelBlock);
extern void DropRelFileNodeBuffers(RelFileNode rnode, ForkNumber forkNum,
bool istemp, BlockNumber firstDelBlock);
extern void DropDatabaseBuffers(Oid dbid);
#ifdef NOT_USED
extern void PrintPinnedBufs(void);
#endif
extern Size BufferShmemSize(void);
extern RelFileNode BufferGetFileNode(Buffer buffer);
extern void BufferGetTag(Buffer buffer, RelFileNode *rnode,
ForkNumber *forknum, BlockNumber *blknum);
extern void SetBufferCommitInfoNeedsSave(Buffer buffer);