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Commit46d2882

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committed
Improve C comments about backend variables set by pg_upgrade_support
functions.
1 parent7f40e30 commit46d2882

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7 files changed

+43
-9
lines changed

7 files changed

+43
-9
lines changed

‎contrib/pg_upgrade/pg_upgrade.c

Lines changed: 22 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -7,6 +7,28 @@
77
*contrib/pg_upgrade/pg_upgrade.c
88
*/
99

10+
/*
11+
*To simplify the upgrade process, we force certain system items to be
12+
*consistent between old and new clusters:
13+
*
14+
*We control all assignments of pg_class.relfilenode so we can keep the
15+
*same relfilenodes for old and new files. The only exception is
16+
*pg_largeobject, pg_largeobject_metadata, and its indexes, which can
17+
*change due to a cluster, reindex, or vacuum full. (We don't create
18+
*those so have no control over their oid/relfilenode values.)
19+
*
20+
*While pg_class.oid and pg_class.relfilenode are intially the same, they
21+
*can diverge due to cluster, reindex, or vacuum full. The new cluster
22+
*will again have matching pg_class.relfilenode and pg_class.oid values,
23+
*but based on the new relfilenode value, so the old/new oids might
24+
*differ.
25+
*
26+
*We control all assignments of pg_type.oid because these are stored
27+
*in composite types.
28+
*/
29+
30+
31+
1032
#include"pg_upgrade.h"
1133

1234
#ifdefHAVE_LANGINFO_H

‎src/backend/catalog/heap.c

Lines changed: 5 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -73,7 +73,7 @@
7373
#include"utils/tqual.h"
7474

7575

76-
/*Kluge for upgrade-in-place support */
76+
/*Potentially set by contrib/pg_upgrade_support functions */
7777
Oidbinary_upgrade_next_heap_relfilenode=InvalidOid;
7878
Oidbinary_upgrade_next_toast_relfilenode=InvalidOid;
7979

@@ -986,7 +986,10 @@ heap_create_with_catalog(const char *relname,
986986
*/
987987
if (!OidIsValid(relid))
988988
{
989-
/* Use binary-upgrade overrides if applicable */
989+
/*
990+
*Use binary-upgrade override for pg_class.relfilenode/oid,
991+
*if supplied.
992+
*/
990993
if (OidIsValid(binary_upgrade_next_heap_relfilenode)&&
991994
(relkind==RELKIND_RELATION||relkind==RELKIND_SEQUENCE||
992995
relkind==RELKIND_VIEW||relkind==RELKIND_COMPOSITE_TYPE||

‎src/backend/catalog/index.c

Lines changed: 5 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -68,7 +68,7 @@
6868
#include"utils/tqual.h"
6969

7070

71-
/*Kluge for upgrade-in-place support */
71+
/*Potentially set by contrib/pg_upgrade_support functions */
7272
Oidbinary_upgrade_next_index_relfilenode=InvalidOid;
7373

7474
/* state info for validate_index bulkdelete callback */
@@ -640,7 +640,10 @@ index_create(Oid heapRelationId,
640640
*/
641641
if (!OidIsValid(indexRelationId))
642642
{
643-
/* Use binary-upgrade override if applicable */
643+
/*
644+
*Use binary-upgrade override for pg_class.relfilenode/oid,
645+
*if supplied.
646+
*/
644647
if (OidIsValid(binary_upgrade_next_index_relfilenode))
645648
{
646649
indexRelationId=binary_upgrade_next_index_relfilenode;

‎src/backend/catalog/pg_enum.c

Lines changed: 4 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -28,6 +28,7 @@
2828
#include"utils/tqual.h"
2929

3030

31+
/* Potentially set by contrib/pg_upgrade_support functions */
3132
Oidbinary_upgrade_next_pg_enum_oid=InvalidOid;
3233

3334
staticvoidRenumberEnumType(Relationpg_enum,HeapTuple*existing,intnelems);
@@ -313,9 +314,9 @@ AddEnumLabel(Oid enumTypeOid,
313314
if (OidIsValid(binary_upgrade_next_pg_enum_oid))
314315
{
315316
/*
316-
* Inbinary upgrades, just add the new label with the predetermined
317-
* Oid. It's pg_upgrade'sresponsibility that the Oid meets
318-
* requirements.
317+
*Usebinary-upgrade override for pg_enum.oid, if supplied.
318+
*During binary upgrade, all pg_enum.oid'sare set this way
319+
*so they are guaranteed to be consistent.
319320
*/
320321
if (neighbor!=NULL)
321322
ereport(ERROR,

‎src/backend/catalog/pg_type.c

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -33,6 +33,7 @@
3333
#include"utils/rel.h"
3434
#include"utils/syscache.h"
3535

36+
/* Potentially set by contrib/pg_upgrade_support functions */
3637
Oidbinary_upgrade_next_pg_type_oid=InvalidOid;
3738

3839
/* ----------------------------------------------------------------
@@ -121,6 +122,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
121122
*/
122123
tup=heap_form_tuple(tupDesc,values,nulls);
123124

125+
/* Use binary-upgrade override for pg_type.oid, if supplied. */
124126
if (OidIsValid(binary_upgrade_next_pg_type_oid))
125127
{
126128
HeapTupleSetOid(tup,binary_upgrade_next_pg_type_oid);
@@ -422,6 +424,7 @@ TypeCreate(Oid newTypeOid,
422424
/* Force the OID if requested by caller */
423425
if (OidIsValid(newTypeOid))
424426
HeapTupleSetOid(tup,newTypeOid);
427+
/* Use binary-upgrade override for pg_type.oid, if supplied. */
425428
elseif (OidIsValid(binary_upgrade_next_pg_type_oid))
426429
{
427430
HeapTupleSetOid(tup,binary_upgrade_next_pg_type_oid);

‎src/backend/catalog/toasting.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -31,7 +31,7 @@
3131
#include"utils/builtins.h"
3232
#include"utils/syscache.h"
3333

34-
/*Kluges for upgrade-in-place support */
34+
/*Potentially set by contrib/pg_upgrade_support functions */
3535
externOidbinary_upgrade_next_toast_relfilenode;
3636

3737
Oidbinary_upgrade_next_pg_type_toast_oid=InvalidOid;
@@ -200,6 +200,7 @@ create_toast_table(Relation rel, Oid toastOid, Oid toastIndexOid, Datum reloptio
200200
else
201201
namespaceid=PG_TOAST_NAMESPACE;
202202

203+
/* Use binary-upgrade override for pg_type.oid, if supplied. */
203204
if (OidIsValid(binary_upgrade_next_pg_type_toast_oid))
204205
{
205206
toast_typid=binary_upgrade_next_pg_type_toast_oid;

‎src/backend/commands/typecmds.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -74,6 +74,7 @@ typedef struct
7474
/* atts[] is of allocated length RelationGetNumberOfAttributes(rel) */
7575
}RelToCheck;
7676

77+
/* Potentially set by contrib/pg_upgrade_support functions */
7778
Oidbinary_upgrade_next_pg_type_array_oid=InvalidOid;
7879

7980
staticOidfindTypeInputFunction(List*procname,OidtypeOid);
@@ -1517,7 +1518,7 @@ AssignTypeArrayOid(void)
15171518
{
15181519
Oidtype_array_oid;
15191520

1520-
/*Pre-assign the type's array OIDforuse inpg_type.typarray */
1521+
/*Use binary-upgrade overridefor pg_type.typarray, if supplied. */
15211522
if (OidIsValid(binary_upgrade_next_pg_type_array_oid))
15221523
{
15231524
type_array_oid=binary_upgrade_next_pg_type_array_oid;

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