mirror of
https://github.com/postgres/postgres.git
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Temporary fix to make TOAST vacuum-safe. All values are forced to be
in memory (plain or compressed) in the tuple returned from the heap-am. So no index will ever contain an external reference. Jan
This commit is contained in:
Jan Wieck
parent
9e85183bfc
commit
82f3945a67
@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.79 2000/07/04 17:11:40 wieck Exp $
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* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.80 2000/07/21 10:31:30 wieck Exp $
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*
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*
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* INTERFACE ROUTINES
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@ -1274,6 +1274,10 @@ Oid
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heap_insert(Relation relation, HeapTuple tup)
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{
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Buffer buffer;
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#ifndef TOAST_INDICES
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HeapTupleHeader plaintdata = NULL;
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int32 plaintlen = 0;
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#endif
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/* increment access statistics */
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tup->tableOid = relation->rd_id;
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@ -1309,7 +1313,11 @@ heap_insert(Relation relation, HeapTuple tup)
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*/
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if (HeapTupleHasExtended(tup) ||
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(MAXALIGN(tup->t_len) > (MaxTupleSize / 4)))
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#ifdef TOAST_INDICES
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heap_tuple_toast_attrs(relation, tup, NULL);
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#else
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heap_tuple_toast_attrs(relation, tup, NULL, &plaintdata, &plaintlen);
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#endif
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#endif
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/* Find buffer for this tuple */
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@ -1347,6 +1355,16 @@ heap_insert(Relation relation, HeapTuple tup)
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if (IsSystemRelationName(RelationGetRelationName(relation)))
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RelationMark4RollbackHeapTuple(relation, tup);
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#ifndef TOAST_INDICES
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if (plaintdata != NULL && tup->t_data != plaintdata)
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{
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if (tup->t_datamcxt != NULL && (char *) (tup->t_data) !=
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((char *) tup + HEAPTUPLESIZE))
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pfree(tup->t_data);
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tup->t_data = plaintdata;
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tup->t_len = plaintlen;
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}
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#endif
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return tup->t_data->t_oid;
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}
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@ -1461,7 +1479,11 @@ l1:
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* ----------
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*/
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if (HeapTupleHasExtended(&tp))
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#ifdef TOAST_INDICES
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heap_tuple_toast_attrs(relation, NULL, &(tp));
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#else
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heap_tuple_toast_attrs(relation, NULL, &(tp), NULL, NULL);
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#endif
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#endif
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LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
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@ -1486,6 +1508,10 @@ heap_update(Relation relation, ItemPointer otid, HeapTuple newtup,
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PageHeader dp;
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Buffer buffer, newbuf;
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int result;
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#ifndef TOAST_INDICES
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HeapTupleHeader plaintdata = NULL;
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int32 plaintlen = 0;
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#endif
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newtup->tableOid = relation->rd_id;
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/* increment access statistics */
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@ -1574,7 +1600,11 @@ l2:
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if (HeapTupleHasExtended(&oldtup) ||
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HeapTupleHasExtended(newtup) ||
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(MAXALIGN(newtup->t_len) > (MaxTupleSize / 4)))
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#ifdef TOAST_INDICES
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heap_tuple_toast_attrs(relation, newtup, &oldtup);
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#else
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heap_tuple_toast_attrs(relation, newtup, &oldtup, &plaintdata, &plaintlen);
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#endif
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#endif
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/* Find buffer for new tuple */
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@ -1637,6 +1667,17 @@ l2:
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RelationInvalidateHeapTuple(relation, &oldtup);
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RelationMark4RollbackHeapTuple(relation, newtup);
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#ifndef TOAST_INDICES
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if (plaintdata != NULL && newtup->t_data != plaintdata)
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{
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if (newtup->t_datamcxt != NULL && (char *) (newtup->t_data) !=
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((char *) newtup + HEAPTUPLESIZE))
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pfree(newtup->t_data);
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newtup->t_data = plaintdata;
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newtup->t_len = plaintlen;
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}
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#endif
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return HeapTupleMayBeUpdated;
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}
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/access/heap/tuptoaster.c,v 1.7 2000/07/11 12:32:03 wieck Exp $
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* $Header: /cvsroot/pgsql/src/backend/access/heap/tuptoaster.c,v 1.8 2000/07/21 10:31:30 wieck Exp $
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*
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*
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* INTERFACE ROUTINES
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@ -43,8 +43,14 @@
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static void toast_delete(Relation rel, HeapTuple oldtup);
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static void toast_delete_datum(Relation rel, Datum value);
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#ifdef TOAST_INDICES
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static void toast_insert_or_update(Relation rel, HeapTuple newtup,
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HeapTuple oldtup);
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#else
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static void toast_insert_or_update(Relation rel, HeapTuple newtup,
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HeapTuple oldtup, HeapTupleHeader *plaintdata,
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int32 *plaintlen);
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#endif
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static Datum toast_compress_datum(Datum value);
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static Datum toast_save_datum(Relation rel, Oid mainoid, int16 attno, Datum value);
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@ -59,6 +65,7 @@ static varattrib *toast_fetch_datum(varattrib *attr);
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* Calls the appropriate event specific action.
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* ----------
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*/
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#ifdef TOAST_INDICES
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void
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heap_tuple_toast_attrs(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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{
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@ -67,6 +74,17 @@ heap_tuple_toast_attrs(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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else
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toast_insert_or_update(rel, newtup, oldtup);
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}
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#else
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void
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heap_tuple_toast_attrs(Relation rel, HeapTuple newtup,
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HeapTuple oldtup, HeapTupleHeader *plaintdata, int32 *plaintlen)
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{
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if (newtup == NULL)
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toast_delete(rel, oldtup);
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else
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toast_insert_or_update(rel, newtup, oldtup, plaintdata, plaintlen);
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}
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#endif
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/* ----------
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@ -181,7 +199,12 @@ toast_delete(Relation rel, HeapTuple oldtup)
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* ----------
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*/
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static void
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#ifdef TOAST_INDICES
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toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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#else
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toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup,
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HeapTupleHeader *plaintdata, int32 *plaintlen)
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#endif
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{
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TupleDesc tupleDesc;
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Form_pg_attribute *att;
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@ -204,6 +227,12 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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bool toast_free[MaxHeapAttributeNumber];
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bool toast_delold[MaxHeapAttributeNumber];
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#ifndef TOAST_INDICES
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bool need_plain = false;
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Datum toast_plains[MaxHeapAttributeNumber];
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bool toast_freeplain[MaxHeapAttributeNumber];
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#endif
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/* ----------
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* Get the tuple descriptor, the number of and attribute
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* descriptors and the location of the tuple values.
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@ -217,10 +246,11 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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* Then collect information about the values given
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* ----------
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*/
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memset(toast_action, ' ', numAttrs * sizeof(char));
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memset(toast_nulls, ' ', numAttrs * sizeof(char));
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memset(toast_free, 0, numAttrs * sizeof(bool));
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memset(toast_delold, 0, numAttrs * sizeof(bool));
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memset(toast_action, ' ', numAttrs * sizeof(char));
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memset(toast_nulls, ' ', numAttrs * sizeof(char));
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memset(toast_free, 0, numAttrs * sizeof(bool));
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memset(toast_freeplain, 0, numAttrs * sizeof(bool));
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memset(toast_delold, 0, numAttrs * sizeof(bool));
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for (i = 0; i < numAttrs; i++)
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{
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varattrib *old_value;
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@ -270,6 +300,25 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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*/
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toast_action[i] = 'p';
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toast_sizes[i] = VARATT_SIZE(toast_values[i]);
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#ifndef TOAST_INDICES
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/* ----------
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* But the tuple returned by the heap-am
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* function must not contain external references.
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* So we have to construct another plain tuple
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* later.
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* ----------
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*/
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if (att[i]->attstorage == 'x' || att[i]->attstorage == 'm')
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toast_plains[i] = PointerGetDatum(
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toast_fetch_datum(new_value));
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else
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toast_plains[i] = PointerGetDatum(
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heap_tuple_untoast_attr(new_value));
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toast_freeplain[i] = true;
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need_plain = true;
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#endif
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continue;
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}
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}
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@ -320,10 +369,17 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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{
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toast_values[i] = PointerGetDatum(heap_tuple_untoast_attr(
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(varattrib *)DatumGetPointer(toast_values[i])));
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#ifndef TOAST_INDICES
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toast_plains[i] = toast_values[i];
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#endif
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toast_free[i] = true;
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need_change = true;
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need_free = true;
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}
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#ifndef TOAST_INDICES
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else
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toast_plains[i] = toast_values[i];
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#endif
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/* ----------
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* Remember the size of this attribute
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@ -339,6 +395,9 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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*/
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toast_action[i] = 'p';
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toast_sizes[i] = att[i]->attlen;
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#ifndef TOAST_INDICES
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toast_plains[i] = toast_values[i];
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#endif
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}
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}
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@ -397,6 +456,9 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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old_value = toast_values[i];
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toast_values[i] = toast_compress_datum(toast_values[i]);
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#ifndef TOAST_INDICES
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toast_plains[i] = toast_values[i];
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#endif
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if (toast_free[i])
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pfree(DatumGetPointer(old_value));
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@ -454,8 +516,14 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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newtup->t_data->t_oid,
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i + 1,
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toast_values[i]);
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#ifndef TOAST_INDICES
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need_plain = true;
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if (toast_free[i])
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toast_freeplain[i] = true;
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#else
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if (toast_free[i])
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pfree(DatumGetPointer(old_value));
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#endif
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toast_free[i] = true;
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toast_sizes[i] = VARATT_SIZE(toast_values[i]);
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@ -506,6 +574,9 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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old_value = toast_values[i];
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toast_values[i] = toast_compress_datum(toast_values[i]);
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#ifndef TOAST_INDICES
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toast_plains[i] = toast_values[i];
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#endif
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if (toast_free[i])
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pfree(DatumGetPointer(old_value));
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@ -562,8 +633,14 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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newtup->t_data->t_oid,
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i + 1,
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toast_values[i]);
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#ifndef TOAST_INDICES
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need_plain = true;
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if (toast_free[i])
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toast_freeplain[i] = true;
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#else
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if (toast_free[i])
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pfree(DatumGetPointer(old_value));
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#endif
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toast_free[i] = true;
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toast_sizes[i] = VARATT_SIZE(toast_values[i]);
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@ -637,14 +714,77 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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}
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#ifndef TOAST_INDICES
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/* ----------
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* In the case we toasted any values, we need to build
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* a new heap tuple with the changed values.
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* ----------
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*/
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if (need_plain)
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{
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int32 new_len;
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MemoryContext oldcxt;
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/* ----------
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* Calculate the new size of the tuple
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* ----------
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*/
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new_len = offsetof(HeapTupleHeaderData, t_bits);
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if (has_nulls)
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new_len += BITMAPLEN(numAttrs);
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new_len = MAXALIGN(new_len);
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new_len += ComputeDataSize(tupleDesc, toast_plains, toast_nulls);
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/* ----------
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* Switch to the memory context of the HeapTuple structure
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* and allocate the new tuple.
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* ----------
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*/
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oldcxt = MemoryContextSwitchTo(newtup->t_datamcxt);
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*plaintdata = palloc(new_len);
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*plaintlen = new_len;
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/* ----------
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* Put the tuple header and the changed values into place
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* ----------
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*/
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memcpy(*plaintdata, newtup->t_data, newtup->t_data->t_hoff);
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DataFill((char *)(MAXALIGN((long)(*plaintdata) +
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offsetof(HeapTupleHeaderData, t_bits) +
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((has_nulls) ? BITMAPLEN(numAttrs) : 0))),
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tupleDesc,
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toast_plains,
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toast_nulls,
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&((*plaintdata)->t_infomask),
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has_nulls ? (*plaintdata)->t_bits : NULL);
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/* ----------
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* Switch back to the old memory context
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* ----------
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*/
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MemoryContextSwitchTo(oldcxt);
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}
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#endif
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/* ----------
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* Free allocated temp values
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* ----------
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*/
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if (need_free)
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for (i = 0; i < numAttrs; i++)
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#ifndef TOAST_INDICES
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{
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if (toast_free[i])
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pfree(DatumGetPointer(toast_values[i]));
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if (toast_freeplain[i])
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pfree(DatumGetPointer(toast_plains[i]));
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}
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#else
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if (toast_free[i])
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pfree(DatumGetPointer(toast_values[i]));
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#endif
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/* ----------
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* Delete external values from the old tuple
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@ -6,7 +6,7 @@
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*
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* Copyright (c) 2000, PostgreSQL Development Team
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*
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* $Id: tuptoaster.h,v 1.5 2000/07/04 06:11:50 tgl Exp $
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* $Id: tuptoaster.h,v 1.6 2000/07/21 10:31:31 wieck Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -20,6 +20,14 @@
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#include "access/tupmacs.h"
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#include "utils/rel.h"
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/*
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* DO NOT ENABLE THIS
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* until we have crash safe file versioning and you've
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* changed VACUUM to recreate indices that use possibly
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* toasted values. 2000/07/20 Jan
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*/
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#undef TOAST_INDICES
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#define TOAST_MAX_CHUNK_SIZE ((MaxTupleSize - \
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MAXALIGN( \
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@ -29,8 +37,14 @@
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MAXALIGN(VARHDRSZ))) / 4)
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#ifdef TOAST_INDICES
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extern void heap_tuple_toast_attrs(Relation rel,
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HeapTuple newtup, HeapTuple oldtup);
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#else
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extern void heap_tuple_toast_attrs(Relation rel,
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HeapTuple newtup, HeapTuple oldtup,
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HeapTupleHeader *plaintdata, int32 *plaintlen);
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#endif
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extern varattrib *heap_tuple_untoast_attr(varattrib * attr);
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