Age Owner TLA Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * rewriteRemove.c
4 : * routines for removing rewrite rules
5 : *
6 : * Portions Copyright (c) 1996-2023, 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/sysattr.h"
20 : #include "access/table.h"
21 : #include "catalog/catalog.h"
22 : #include "catalog/dependency.h"
23 : #include "catalog/indexing.h"
24 : #include "catalog/namespace.h"
25 : #include "catalog/pg_rewrite.h"
26 : #include "miscadmin.h"
27 : #include "rewrite/rewriteRemove.h"
28 : #include "utils/acl.h"
29 : #include "utils/fmgroids.h"
30 : #include "utils/inval.h"
31 : #include "utils/lsyscache.h"
32 : #include "utils/rel.h"
33 : #include "utils/syscache.h"
34 :
35 : /*
36 : * Guts of rule deletion.
37 : */
38 : void
7576 tgl 39 CBC 1331 : RemoveRewriteRuleById(Oid ruleOid)
40 : {
41 : Relation RewriteRelation;
42 : ScanKeyData skey[1];
43 : SysScanDesc rcscan;
44 : Relation event_relation;
45 : HeapTuple tuple;
46 : Oid eventRelationOid;
47 :
48 : /*
49 : * Open the pg_rewrite relation.
50 : */
1539 andres 51 1331 : RewriteRelation = table_open(RewriteRelationId, RowExclusiveLock);
52 :
53 : /*
54 : * Find the tuple for the target rule.
55 : */
7088 tgl 56 1331 : ScanKeyInit(&skey[0],
57 : Anum_pg_rewrite_oid,
58 : BTEqualStrategyNumber, F_OIDEQ,
59 : ObjectIdGetDatum(ruleOid));
60 :
6569 61 1331 : rcscan = systable_beginscan(RewriteRelation, RewriteOidIndexId, true,
62 : NULL, 1, skey);
63 :
7576 64 1331 : tuple = systable_getnext(rcscan);
65 :
66 1331 : if (!HeapTupleIsValid(tuple))
7198 tgl 67 UBC 0 : elog(ERROR, "could not find tuple for rule %u", ruleOid);
68 :
69 : /*
70 : * We had better grab AccessExclusiveLock to ensure that no queries are
71 : * going on that might depend on this rule. (Note: a weaker lock would
72 : * suffice if it's not an ON SELECT rule.)
73 : */
7576 tgl 74 CBC 1331 : eventRelationOid = ((Form_pg_rewrite) GETSTRUCT(tuple))->ev_class;
1539 andres 75 1331 : event_relation = table_open(eventRelationOid, AccessExclusiveLock);
76 :
1206 peter 77 1331 : if (!allowSystemTableMods && IsSystemRelation(event_relation))
78 1 : ereport(ERROR,
79 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
80 : errmsg("permission denied: \"%s\" is a system catalog",
81 : RelationGetRelationName(event_relation))));
82 :
83 : /*
84 : * Now delete the pg_rewrite tuple for the rule
85 : */
2258 tgl 86 1330 : CatalogTupleDelete(RewriteRelation, &tuple->t_self);
87 :
7576 88 1330 : systable_endscan(rcscan);
89 :
1539 andres 90 1330 : table_close(RewriteRelation, RowExclusiveLock);
91 :
92 : /*
93 : * Issue shared-inval notice to force all backends (including me!) to
94 : * update relcache entries with the new rule set.
95 : */
5263 tgl 96 1330 : CacheInvalidateRelcache(event_relation);
97 :
98 : /* Close rel, but keep lock till commit... */
1539 andres 99 1330 : table_close(event_relation, NoLock);
9770 scrappy 100 1330 : }
|
