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Fix subtransaction behavior for large objects, temp namespace, files,

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password/group files.  Also allow read-only subtransactions of a read-write
parent, but not vice versa.  These are the reasonably noncontroversial
parts of Alvaro's recent mop-up patch, plus further work on large objects
to minimize use of the TopTransactionResourceOwner.
This commit is contained in:
Tom Lane
2004-07-28 14:23:31 +00:00
parent cc813fc2b8
commit 1bf3d61504
17 changed files with 572 additions and 205 deletions
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22
src/include/storage/large_object.h
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@@ -1,47 +1,44 @@
/*-------------------------------------------------------------------------
*
* large_object.h
* file of info for Postgres large objects. POSTGRES 4.2 supports
* Declarations for PostgreSQL large objects. POSTGRES 4.2 supported
* zillions of large objects (internal, external, jaquith, inversion).
* Now we only support inversion.
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/large_object.h,v 1.27 2003/11/29 22:41:13 pgsql Exp $
* $PostgreSQL: pgsql/src/include/storage/large_object.h,v 1.28 2004/07/28 14:23:31 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef LARGE_OBJECT_H
#define LARGE_OBJECT_H
#include "utils/rel.h"
/*----------
* Data about a currently-open large object.
*
* id is the logical OID of the large object
* xid is the transaction Id that opened the LO (or currently owns it)
* offset is the current seek offset within the LO
* heap_r holds an open-relation reference to pg_largeobject
* index_r holds an open-relation reference to pg_largeobject_loid_pn_index
* flags contains some flag bits
*
* NOTE: before 7.1, heap_r and index_r held references to the separate
* table and index of a specific large object. Now they all live in one rel.
* NOTE: before 7.1, we also had to store references to the separate table
* and index of a specific large object. Now they all live in pg_largeobject
* and are accessed via a common relation descriptor.
*----------
*/
typedef struct LargeObjectDesc
{
Oid id;
Oid id; /* LO's identifier */
TransactionId xid; /* owning XID */
uint32 offset; /* current seek pointer */
int flags; /* locking info, etc */
/* flag bits: */
#define IFS_RDLOCK (1 << 0)
#define IFS_WRLOCK (1 << 1)
Relation heap_r;
Relation index_r;
} LargeObjectDesc;
@@ -67,6 +64,7 @@ typedef struct LargeObjectDesc
*/
/* inversion stuff in inv_api.c */
extern void close_lo_relation(bool isCommit);
extern LargeObjectDesc *inv_create(int flags);
extern LargeObjectDesc *inv_open(Oid lobjId, int flags);
extern void inv_close(LargeObjectDesc *obj_desc);