database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-25 12:03:53 +03:00
Code Activity

Include the backend ID in the relpath of temporary relations.

Browse Source 
This allows us to reliably remove all leftover temporary relation
files on cluster startup without reference to system catalogs or WAL;
therefore, we no longer include temporary relations in XLOG_XACT_COMMIT
and XLOG_XACT_ABORT WAL records.

Since these changes require including a backend ID in each
SharedInvalSmgrMsg, the size of the SharedInvalidationMessage.id
field has been reduced from two bytes to one, and the maximum number
of connections has been reduced from INT_MAX / 4 to 2^23-1.  It would
be possible to remove these restrictions by increasing the size of
SharedInvalidationMessage by 4 bytes, but right now that doesn't seem
like a good trade-off.

Review by Jaime Casanova and Tom Lane.
This commit is contained in:
Robert Haas
2010-08-13 20:10:54 +00:00
parent 3f9479ef3f
commit debcec7dc3
37 changed files with 669 additions and 343 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
src/include/storage/smgr.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/smgr.h,v 1.71 2010/02/26 02:01:28 momjian Exp $
* $PostgreSQL: pgsql/src/include/storage/smgr.h,v 1.72 2010/08/13 20:10:53 rhaas Exp $
*
*-------------------------------------------------------------------------
*/
@@ -16,6 +16,7 @@
#include "access/xlog.h"
#include "fmgr.h"
#include "storage/backendid.h"
#include "storage/block.h"
#include "storage/relfilenode.h"
@@ -38,7 +39,7 @@
typedef struct SMgrRelationData
{
/* rnode is the hashtable lookup key, so it must be first! */
RelFileNode smgr_rnode; /* relation physical identifier */
RelFileNodeBackend smgr_rnode; /* relation physical identifier */
/* pointer to owning pointer, or NULL if none */
struct SMgrRelationData **smgr_owner;
@@ -68,28 +69,30 @@ typedef struct SMgrRelationData
typedef SMgrRelationData *SMgrRelation;
#define SmgrIsTemp(smgr) \
((smgr)->smgr_rnode.backend != InvalidBackendId)
extern void smgrinit(void);
extern SMgrRelation smgropen(RelFileNode rnode);
extern SMgrRelation smgropen(RelFileNode rnode, BackendId backend);
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 smgrclosenode(RelFileNodeBackend rnode);
extern void smgrcreate(SMgrRelation reln, ForkNumber forknum, bool isRedo);
extern void smgrdounlink(SMgrRelation reln, ForkNumber forknum,
bool isTemp, bool isRedo);
bool isRedo);
extern void smgrextend(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum, char *buffer, bool isTemp);
BlockNumber blocknum, char *buffer, bool skipFsync);
extern void smgrprefetch(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum);
extern void smgrread(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum, char *buffer);
extern void smgrwrite(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum, char *buffer, bool isTemp);
BlockNumber blocknum, char *buffer, bool skipFsync);
extern BlockNumber smgrnblocks(SMgrRelation reln, ForkNumber forknum);
extern void smgrtruncate(SMgrRelation reln, ForkNumber forknum,
BlockNumber nblocks, bool isTemp);
BlockNumber nblocks);
extern void smgrimmedsync(SMgrRelation reln, ForkNumber forknum);
extern void smgrpreckpt(void);
extern void smgrsync(void);
@@ -103,27 +106,28 @@ extern void mdinit(void);
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 mdunlink(RelFileNodeBackend rnode, ForkNumber forknum, bool isRedo);
extern void mdextend(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum, char *buffer, bool isTemp);
BlockNumber blocknum, char *buffer, bool skipFsync);
extern void mdprefetch(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum);
extern void mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
char *buffer);
extern void mdwrite(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum, char *buffer, bool isTemp);
BlockNumber blocknum, char *buffer, bool skipFsync);
extern BlockNumber mdnblocks(SMgrRelation reln, ForkNumber forknum);
extern void mdtruncate(SMgrRelation reln, ForkNumber forknum,
BlockNumber nblocks, bool isTemp);
BlockNumber nblocks);
extern void mdimmedsync(SMgrRelation reln, ForkNumber forknum);
extern void mdpreckpt(void);
extern void mdsync(void);
extern void mdpostckpt(void);
extern void SetForwardFsyncRequests(void);
extern void RememberFsyncRequest(RelFileNode rnode, ForkNumber forknum,
extern void RememberFsyncRequest(RelFileNodeBackend rnode, ForkNumber forknum,
BlockNumber segno);
extern void ForgetRelationFsyncRequests(RelFileNode rnode, ForkNumber forknum);
extern void ForgetRelationFsyncRequests(RelFileNodeBackend rnode,
ForkNumber forknum);
extern void ForgetDatabaseFsyncRequests(Oid dbid);
/* smgrtype.c */