PostgreSQL Source Code: src/backend/rewrite/rewriteRemove.c Source File

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rewriteRemove.c
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1/*-------------------------------------------------------------------------
2 *
3 * rewriteRemove.c
4 * routines for removing rewrite rules
5 *
6 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
7 * Portions Copyright (c) 1994, Regents of the University of California
8 *
9 *
10 * IDENTIFICATION
11 * src/backend/rewrite/rewriteRemove.c
12 *
13 *-------------------------------------------------------------------------
14 */
15#include "postgres.h"
16
17#include "access/genam.h"
18#include "access/htup_details.h"
19#include "access/table.h"
20#include "catalog/catalog.h"
21#include "catalog/indexing.h"
22#include "catalog/pg_rewrite.h"
23#include "miscadmin.h"
24#include "rewrite/rewriteRemove.h"
25#include "utils/fmgroids.h"
26#include "utils/inval.h"
27#include "utils/rel.h"
28
29/*
30 * Guts of rule deletion.
31 */
32void
33 RemoveRewriteRuleById(Oid ruleOid)
34{
35 Relation RewriteRelation;
36 ScanKeyData skey[1];
37 SysScanDesc rcscan;
38 Relation event_relation;
39 HeapTuple tuple;
40 Oid eventRelationOid;
41
42 /*
43 * Open the pg_rewrite relation.
44 */
45 RewriteRelation = table_open(RewriteRelationId, RowExclusiveLock);
46
47 /*
48 * Find the tuple for the target rule.
49 */
50 ScanKeyInit(&skey[0],
51 Anum_pg_rewrite_oid,
52 BTEqualStrategyNumber, F_OIDEQ,
53 ObjectIdGetDatum(ruleOid));
54
55 rcscan = systable_beginscan(RewriteRelation, RewriteOidIndexId, true,
56 NULL, 1, skey);
57
58 tuple = systable_getnext(rcscan);
59
60 if (!HeapTupleIsValid(tuple))
61 elog(ERROR, "could not find tuple for rule %u", ruleOid);
62
63 /*
64 * We had better grab AccessExclusiveLock to ensure that no queries are
65 * going on that might depend on this rule. (Note: a weaker lock would
66 * suffice if it's not an ON SELECT rule.)
67 */
68 eventRelationOid = ((Form_pg_rewrite) GETSTRUCT(tuple))->ev_class;
69 event_relation = table_open(eventRelationOid, AccessExclusiveLock);
70
71 if (!allowSystemTableMods && IsSystemRelation(event_relation))
72 ereport(ERROR,
73 (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
74 errmsg("permission denied: \"%s\" is a system catalog",
75 RelationGetRelationName(event_relation))));
76
77 /*
78 * Now delete the pg_rewrite tuple for the rule
79 */
80 CatalogTupleDelete(RewriteRelation, &tuple->t_self);
81
82 systable_endscan(rcscan);
83
84 table_close(RewriteRelation, RowExclusiveLock);
85
86 /*
87 * Issue shared-inval notice to force all backends (including me!) to
88 * update relcache entries with the new rule set.
89 */
90 CacheInvalidateRelcache(event_relation);
91
92 /* Close rel, but keep lock till commit... */
93 table_close(event_relation, NoLock);
94}
bool IsSystemRelation(Relation relation)
Definition: catalog.c:74
int errcode(int sqlerrcode)
Definition: elog.c:854
int errmsg(const char *fmt,...)
Definition: elog.c:1071
#define ERROR
Definition: elog.h:39
#define elog(elevel,...)
Definition: elog.h:226
#define ereport(elevel,...)
Definition: elog.h:150
void systable_endscan(SysScanDesc sysscan)
Definition: genam.c:603
HeapTuple systable_getnext(SysScanDesc sysscan)
Definition: genam.c:514
SysScanDesc systable_beginscan(Relation heapRelation, Oid indexId, bool indexOK, Snapshot snapshot, int nkeys, ScanKey key)
Definition: genam.c:388
bool allowSystemTableMods
Definition: globals.c:130
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
static void * GETSTRUCT(const HeapTupleData *tuple)
Definition: htup_details.h:728
void CatalogTupleDelete(Relation heapRel, ItemPointer tid)
Definition: indexing.c:365
void CacheInvalidateRelcache(Relation relation)
Definition: inval.c:1631
#define NoLock
Definition: lockdefs.h:34
#define AccessExclusiveLock
Definition: lockdefs.h:43
#define RowExclusiveLock
Definition: lockdefs.h:38
FormData_pg_rewrite * Form_pg_rewrite
Definition: pg_rewrite.h:52
static Datum ObjectIdGetDatum(Oid X)
Definition: postgres.h:262
unsigned int Oid
Definition: postgres_ext.h:32
#define RelationGetRelationName(relation)
Definition: rel.h:548
void RemoveRewriteRuleById(Oid ruleOid)
Definition: rewriteRemove.c:33
void ScanKeyInit(ScanKey entry, AttrNumber attributeNumber, StrategyNumber strategy, RegProcedure procedure, Datum argument)
Definition: scankey.c:76
#define BTEqualStrategyNumber
Definition: stratnum.h:31
ItemPointerData t_self
Definition: htup.h:65
Definition: rel.h:56
Definition: skey.h:65
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:126
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:40

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