IsSystemRelationName() treats TOAST relations as system relations.

This seems the right thing for most usages, but I notice two places
where it is the wrong thing.  One is that the default permissions on
TOAST rels should be no-access, not world-readable; the other is that
PrepareForTupleInvalidation doesn't really need to spend time looking
at tuples of TOAST relations.

diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index 78b566532efe1d96a034b9b3288a6c7196ee1e56..2a6ddf11ff3a8d685833ce82c21c65af9c138348 100644 (file)
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *   $Header: /cvsroot/pgsql/src/backend/catalog/catalog.c,v 1.43 2001/08/10 18:57:33 tgl Exp $
+ *   $Header: /cvsroot/pgsql/src/backend/catalog/catalog.c,v 1.44 2001/11/16 23:30:35 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -77,6 +77,10 @@ GetDatabasePath(Oid tblNode)
  * IsSystemRelationName
  *     True iff name is the name of a system catalog relation.
  *
+ *     NB: TOAST relations are considered system relations by this test.
+ *     This is appropriate in many places but not all.  Where it's not,
+ *     also check IsToastRelationName.
+ *
  *     We now make a new requirement where system catalog relns must begin
  *     with pg_ while user relns are forbidden to do so.  Make the test
  *     trivial and instantaneous.
@@ -86,12 +90,20 @@ GetDatabasePath(Oid tblNode)
 bool
 IsSystemRelationName(const char *relname)
 {
-   if (relname[0] && relname[1] && relname[2])
-       return (relname[0] == 'p' &&
-               relname[1] == 'g' &&
-               relname[2] == '_');
-   else
-       return FALSE;
+   /* ugly coding for speed */
+   return (relname[0] == 'p' &&
+           relname[1] == 'g' &&
+           relname[2] == '_');
+}
+
+/*
+ * IsToastRelationName
+ *     True iff name is the name of a TOAST support relation (or index).
+ */
+bool
+IsToastRelationName(const char *relname)
+{
+   return strncmp(relname, "pg_toast_", 9) == 0;
 }
 
 /*

diff --git a/src/backend/utils/adt/acl.c b/src/backend/utils/adt/acl.c
index 11f4dc52bf00b8e87060b2be1a72495e44f222db..a868c6c1c054a3ed0a9177295fe2e4d81f80bbd0 100644 (file)
--- a/src/backend/utils/adt/acl.c
+++ b/src/backend/utils/adt/acl.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *   $Header: /cvsroot/pgsql/src/backend/utils/adt/acl.c,v 1.65 2001/10/25 05:49:43 momjian Exp $
+ *   $Header: /cvsroot/pgsql/src/backend/utils/adt/acl.c,v 1.66 2001/11/16 23:30:35 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -385,7 +385,9 @@ acldefault(const char *relname, AclId ownerid)
    aip = ACL_DAT(acl);
    aip[0].ai_idtype = ACL_IDTYPE_WORLD;
    aip[0].ai_id = ACL_ID_WORLD;
-   aip[0].ai_mode = IsSystemRelationName(relname) ? ACL_SELECT : ACL_WORLD_DEFAULT;
+   aip[0].ai_mode = (IsSystemRelationName(relname) &&
+                     !IsToastRelationName(relname)) ? ACL_SELECT
+       : ACL_WORLD_DEFAULT;
    aip[1].ai_idtype = ACL_IDTYPE_UID;
    aip[1].ai_id = ownerid;
    aip[1].ai_mode = ACL_OWNER_DEFAULT;

diff --git a/src/backend/utils/cache/inval.c b/src/backend/utils/cache/inval.c
index 9ebf5f3bf2f086a4475597a5995133aaf39cf548..40d79942d5e0203e137d5bed7ff14e0207c9cb28 100644 (file)
--- a/src/backend/utils/cache/inval.c
+++ b/src/backend/utils/cache/inval.c
@@ -56,7 +56,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *   $Header: /cvsroot/pgsql/src/backend/utils/cache/inval.c,v 1.46 2001/10/25 05:49:46 momjian Exp $
+ *   $Header: /cvsroot/pgsql/src/backend/utils/cache/inval.c,v 1.47 2001/11/16 23:30:35 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -437,9 +437,13 @@ PrepareForTupleInvalidation(Relation relation, HeapTuple tuple,
     * We only need to worry about invalidation for tuples that are in
     * system relations; user-relation tuples are never in catcaches and
     * can't affect the relcache either.
+    *
+    * TOAST tuples can likewise be ignored here.
     */
    if (!IsSystemRelationName(NameStr(RelationGetForm(relation)->relname)))
        return;
+   if (IsToastRelationName(NameStr(RelationGetForm(relation)->relname)))
+       return;
 
    /*
     * First let the catcache do its thing

diff --git a/src/include/catalog/catalog.h b/src/include/catalog/catalog.h
index cf4f36fe4eb80bed2188174cb251c78d404f0298..25f6fcb0c5c1dc92877f1ec57ee16faa6752f279 100644 (file)
--- a/src/include/catalog/catalog.h
+++ b/src/include/catalog/catalog.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: catalog.h,v 1.20 2001/11/05 17:46:31 momjian Exp $
+ * $Id: catalog.h,v 1.21 2001/11/16 23:30:35 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -22,6 +22,7 @@ extern char *relpath(RelFileNode rnode);
 extern char *GetDatabasePath(Oid tblNode);
 
 extern bool IsSystemRelationName(const char *relname);
+extern bool IsToastRelationName(const char *relname);
 extern bool IsSharedSystemRelationName(const char *relname);
 
 extern Oid newoid(void);