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Modify tuptoaster's API so that it does not try to modify the passed
tuple in-place, but instead passes back an all-new tuple structure if any changes are needed. This is a much cleaner and more robust solution for the bug discovered by Alexey Beschiokov; accordingly, revert the quick hack I installed yesterday. With this change, HeapTupleData.t_datamcxt is no longer needed; will remove it in a separate commit in HEAD only.
This commit is contained in:
Tom Lane
parent
33a9af738d
commit
40314f2dac
@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/access/heap/heapam.c,v 1.200 2005/10/15 02:49:08 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/access/heap/heapam.c,v 1.201 2005/11/20 18:38:20 tgl Exp $
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*
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*
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* INTERFACE ROUTINES
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@ -1085,12 +1085,19 @@ heap_get_latest_tid(Relation relation,
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*
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* use_fsm is passed directly to RelationGetBufferForTuple, which see for
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* more info.
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*
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* The return value is the OID assigned to the tuple (either here or by the
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* caller), or InvalidOid if no OID. The header fields of *tup are updated
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* to match the stored tuple; in particular tup->t_self receives the actual
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* TID where the tuple was stored. But note that any toasting of fields
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* within the tuple data is NOT reflected into *tup.
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*/
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Oid
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heap_insert(Relation relation, HeapTuple tup, CommandId cid,
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bool use_wal, bool use_fsm)
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{
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TransactionId xid = GetCurrentTransactionId();
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HeapTuple heaptup;
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Buffer buffer;
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if (relation->rd_rel->relhasoids)
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@ -1128,19 +1135,24 @@ heap_insert(Relation relation, HeapTuple tup, CommandId cid,
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/*
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* If the new tuple is too big for storage or contains already toasted
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* out-of-line attributes from some other relation, invoke the toaster.
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*
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* Note: below this point, heaptup is the data we actually intend to
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* store into the relation; tup is the caller's original untoasted data.
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*/
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if (HeapTupleHasExternal(tup) ||
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(MAXALIGN(tup->t_len) > TOAST_TUPLE_THRESHOLD))
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heap_tuple_toast_attrs(relation, tup, NULL);
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heaptup = toast_insert_or_update(relation, tup, NULL);
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else
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heaptup = tup;
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/* Find buffer to insert this tuple into */
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buffer = RelationGetBufferForTuple(relation, tup->t_len,
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buffer = RelationGetBufferForTuple(relation, heaptup->t_len,
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InvalidBuffer, use_fsm);
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/* NO EREPORT(ERROR) from here till changes are logged */
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START_CRIT_SECTION();
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RelationPutHeapTuple(relation, buffer, tup);
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RelationPutHeapTuple(relation, buffer, heaptup);
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/* XLOG stuff */
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if (relation->rd_istemp)
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@ -1158,15 +1170,15 @@ heap_insert(Relation relation, HeapTuple tup, CommandId cid,
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uint8 info = XLOG_HEAP_INSERT;
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xlrec.target.node = relation->rd_node;
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xlrec.target.tid = tup->t_self;
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xlrec.target.tid = heaptup->t_self;
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rdata[0].data = (char *) &xlrec;
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rdata[0].len = SizeOfHeapInsert;
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rdata[0].buffer = InvalidBuffer;
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rdata[0].next = &(rdata[1]);
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xlhdr.t_natts = tup->t_data->t_natts;
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xlhdr.t_infomask = tup->t_data->t_infomask;
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xlhdr.t_hoff = tup->t_data->t_hoff;
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xlhdr.t_natts = heaptup->t_data->t_natts;
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xlhdr.t_infomask = heaptup->t_data->t_infomask;
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xlhdr.t_hoff = heaptup->t_data->t_hoff;
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/*
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* note we mark rdata[1] as belonging to buffer; if XLogInsert decides
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@ -1180,8 +1192,8 @@ heap_insert(Relation relation, HeapTuple tup, CommandId cid,
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rdata[1].next = &(rdata[2]);
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/* PG73FORMAT: write bitmap [+ padding] [+ oid] + data */
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rdata[2].data = (char *) tup->t_data + offsetof(HeapTupleHeaderData, t_bits);
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rdata[2].len = tup->t_len - offsetof(HeapTupleHeaderData, t_bits);
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rdata[2].data = (char *) heaptup->t_data + offsetof(HeapTupleHeaderData, t_bits);
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rdata[2].len = heaptup->t_len - offsetof(HeapTupleHeaderData, t_bits);
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rdata[2].buffer = buffer;
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rdata[2].buffer_std = true;
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rdata[2].next = NULL;
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@ -1191,7 +1203,7 @@ heap_insert(Relation relation, HeapTuple tup, CommandId cid,
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* page instead of restoring the whole thing. Set flag, and hide
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* buffer references from XLogInsert.
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*/
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if (ItemPointerGetOffsetNumber(&(tup->t_self)) == FirstOffsetNumber &&
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if (ItemPointerGetOffsetNumber(&(heaptup->t_self)) == FirstOffsetNumber &&
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PageGetMaxOffsetNumber(page) == FirstOffsetNumber)
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{
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info |= XLOG_HEAP_INIT_PAGE;
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@ -1212,13 +1224,23 @@ heap_insert(Relation relation, HeapTuple tup, CommandId cid,
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/*
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* If tuple is cachable, mark it for invalidation from the caches in case
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* we abort. Note it is OK to do this after WriteBuffer releases the
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* buffer, because the "tup" data structure is all in local memory, not in
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* the shared buffer.
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* buffer, because the heaptup data structure is all in local memory,
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* not in the shared buffer.
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*/
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CacheInvalidateHeapTuple(relation, tup);
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CacheInvalidateHeapTuple(relation, heaptup);
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pgstat_count_heap_insert(&relation->pgstat_info);
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/*
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* If heaptup is a private copy, release it. Don't forget to copy t_self
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* back to the caller's image, too.
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*/
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if (heaptup != tup)
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{
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tup->t_self = heaptup->t_self;
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heap_freetuple(heaptup);
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}
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return HeapTupleGetOid(tup);
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}
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@ -1469,7 +1491,7 @@ l1:
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* context lock on the buffer first.
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*/
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if (HeapTupleHasExternal(&tp))
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heap_tuple_toast_attrs(relation, NULL, &tp);
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toast_delete(relation, &tp);
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/*
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* Mark tuple for invalidation from system caches at next command
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@ -1553,8 +1575,10 @@ simple_heap_delete(Relation relation, ItemPointer tid)
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* HeapTupleSelfUpdated, HeapTupleUpdated, or HeapTupleBeingUpdated
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* (the last only possible if wait == false).
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*
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* On success, newtup->t_self is set to the TID where the new tuple
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* was inserted.
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* On success, the header fields of *newtup are updated to match the new
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* stored tuple; in particular, newtup->t_self is set to the TID where the
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* new tuple was inserted. However, any TOAST changes in the new tuple's
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* data are not reflected into *newtup.
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*
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* In the failure cases, the routine returns the tuple's t_ctid and t_xmax.
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* If t_ctid is the same as otid, the tuple was deleted; if different, the
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@ -1570,6 +1594,7 @@ heap_update(Relation relation, ItemPointer otid, HeapTuple newtup,
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TransactionId xid = GetCurrentTransactionId();
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ItemId lp;
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HeapTupleData oldtup;
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HeapTuple heaptup;
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PageHeader dp;
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Buffer buffer,
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newbuf;
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@ -1760,11 +1785,12 @@ l2:
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* We need to invoke the toaster if there are already any out-of-line toasted
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* values present, or if the new tuple is over-threshold.
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*/
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newtupsize = MAXALIGN(newtup->t_len);
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need_toast = (HeapTupleHasExternal(&oldtup) ||
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HeapTupleHasExternal(newtup) ||
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(MAXALIGN(newtup->t_len) > TOAST_TUPLE_THRESHOLD));
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newtupsize > TOAST_TUPLE_THRESHOLD);
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newtupsize = MAXALIGN(newtup->t_len);
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pagefree = PageGetFreeSpace((Page) dp);
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if (need_toast || newtupsize > pagefree)
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@ -1776,15 +1802,25 @@ l2:
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HEAP_MOVED);
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HeapTupleHeaderSetXmax(oldtup.t_data, xid);
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HeapTupleHeaderSetCmax(oldtup.t_data, cid);
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/* temporarily make it look not-updated */
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oldtup.t_data->t_ctid = oldtup.t_self;
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already_marked = true;
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LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
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/* Let the toaster do its thing */
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/*
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* Let the toaster do its thing, if needed.
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*
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* Note: below this point, heaptup is the data we actually intend to
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* store into the relation; newtup is the caller's original untoasted
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* data.
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*/
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if (need_toast)
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{
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heap_tuple_toast_attrs(relation, newtup, &oldtup);
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newtupsize = MAXALIGN(newtup->t_len);
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heaptup = toast_insert_or_update(relation, newtup, &oldtup);
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newtupsize = MAXALIGN(heaptup->t_len);
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}
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else
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heaptup = newtup;
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/*
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* Now, do we need a new page for the tuple, or not? This is a bit
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@ -1805,8 +1841,8 @@ l2:
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*/
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if (newtupsize > pagefree)
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{
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/* Assume there's no chance to put newtup on same page. */
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newbuf = RelationGetBufferForTuple(relation, newtup->t_len,
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/* Assume there's no chance to put heaptup on same page. */
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newbuf = RelationGetBufferForTuple(relation, heaptup->t_len,
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buffer, true);
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}
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else
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@ -1823,7 +1859,7 @@ l2:
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* seldom be taken.
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*/
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LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
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newbuf = RelationGetBufferForTuple(relation, newtup->t_len,
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newbuf = RelationGetBufferForTuple(relation, heaptup->t_len,
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buffer, true);
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}
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else
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@ -1838,6 +1874,7 @@ l2:
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/* No TOAST work needed, and it'll fit on same page */
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already_marked = false;
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newbuf = buffer;
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heaptup = newtup;
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}
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/*
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@ -1849,7 +1886,7 @@ l2:
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/* NO EREPORT(ERROR) from here till changes are logged */
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START_CRIT_SECTION();
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RelationPutHeapTuple(relation, newbuf, newtup); /* insert new tuple */
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RelationPutHeapTuple(relation, newbuf, heaptup); /* insert new tuple */
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if (!already_marked)
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{
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@ -1863,13 +1900,13 @@ l2:
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}
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/* record address of new tuple in t_ctid of old one */
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oldtup.t_data->t_ctid = newtup->t_self;
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oldtup.t_data->t_ctid = heaptup->t_self;
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/* XLOG stuff */
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if (!relation->rd_istemp)
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{
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XLogRecPtr recptr = log_heap_update(relation, buffer, oldtup.t_self,
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newbuf, newtup, false);
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newbuf, heaptup, false);
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if (newbuf != buffer)
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{
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@ -1905,10 +1942,10 @@ l2:
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/*
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* If new tuple is cachable, mark it for invalidation from the caches in
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* case we abort. Note it is OK to do this after WriteBuffer releases the
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* buffer, because the "newtup" data structure is all in local memory, not
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* buffer, because the heaptup data structure is all in local memory, not
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* in the shared buffer.
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*/
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CacheInvalidateHeapTuple(relation, newtup);
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CacheInvalidateHeapTuple(relation, heaptup);
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/*
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* Release the lmgr tuple lock, if we had it.
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@ -1918,6 +1955,16 @@ l2:
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pgstat_count_heap_update(&relation->pgstat_info);
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/*
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* If heaptup is a private copy, release it. Don't forget to copy t_self
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* back to the caller's image, too.
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*/
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if (heaptup != newtup)
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{
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newtup->t_self = heaptup->t_self;
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heap_freetuple(heaptup);
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}
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return HeapTupleMayBeUpdated;
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}
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@ -8,14 +8,17 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/access/heap/tuptoaster.c,v 1.53 2005/10/15 02:49:09 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/access/heap/tuptoaster.c,v 1.54 2005/11/20 18:38:20 tgl Exp $
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*
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*
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* INTERFACE ROUTINES
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* heap_tuple_toast_attrs -
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* toast_insert_or_update -
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* Try to make a given tuple fit into one page by compressing
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* or moving off attributes
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*
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* toast_delete -
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* Reclaim toast storage when a tuple is deleted
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*
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* heap_tuple_untoast_attr -
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* Fetch back a given value from the "secondary" relation
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*
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@ -40,34 +43,13 @@
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#undef TOAST_DEBUG
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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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static void toast_insert_or_update(Relation rel, HeapTuple newtup,
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HeapTuple oldtup);
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static Datum toast_save_datum(Relation rel, Datum value);
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static varattrib *toast_fetch_datum(varattrib *attr);
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static varattrib *toast_fetch_datum_slice(varattrib *attr,
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int32 sliceoffset, int32 length);
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/* ----------
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* heap_tuple_toast_attrs -
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*
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* This is the central public entry point for toasting from heapam.
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*
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* Calls the appropriate event specific action.
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* ----------
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*/
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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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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);
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}
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/* ----------
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* heap_tuple_fetch_attr -
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*
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@ -305,7 +287,7 @@ toast_datum_size(Datum value)
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* Cascaded delete toast-entries on DELETE
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* ----------
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*/
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static void
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void
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toast_delete(Relation rel, HeapTuple oldtup)
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{
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TupleDesc tupleDesc;
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@ -355,11 +337,22 @@ toast_delete(Relation rel, HeapTuple oldtup)
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*
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* Delete no-longer-used toast-entries and create new ones to
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* make the new tuple fit on INSERT or UPDATE
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*
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* Inputs:
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* newtup: the candidate new tuple to be inserted
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* oldtup: the old row version for UPDATE, or NULL for INSERT
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* Result:
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* either newtup if no toasting is needed, or a palloc'd modified tuple
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* that is what should actually get stored
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*
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* NOTE: neither newtup nor oldtup will be modified. This is a change
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* from the pre-8.1 API of this routine.
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* ----------
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*/
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static void
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HeapTuple
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toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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{
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HeapTuple result_tuple;
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TupleDesc tupleDesc;
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Form_pg_attribute *att;
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int numAttrs;
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@ -757,7 +750,7 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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if (need_change)
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{
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HeapTupleHeader olddata = newtup->t_data;
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char *new_data;
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HeapTupleHeader new_data;
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int32 new_len;
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/*
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@ -775,14 +768,18 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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toast_values, toast_isnull);
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/*
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* Allocate new tuple in same context as old one.
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* Allocate and zero the space needed, and fill HeapTupleData fields.
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*/
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new_data = (char *) MemoryContextAlloc(newtup->t_datamcxt, new_len);
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newtup->t_data = (HeapTupleHeader) new_data;
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newtup->t_len = new_len;
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result_tuple = (HeapTuple) palloc0(HEAPTUPLESIZE + new_len);
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result_tuple->t_len = new_len;
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result_tuple->t_self = newtup->t_self;
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result_tuple->t_tableOid = newtup->t_tableOid;
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result_tuple->t_datamcxt = CurrentMemoryContext;
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new_data = (HeapTupleHeader) ((char *) result_tuple + HEAPTUPLESIZE);
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result_tuple->t_data = new_data;
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/*
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* Put the tuple header and the changed values into place
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* Put the existing tuple header and the changed values into place
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*/
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memcpy(new_data, olddata, olddata->t_hoff);
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@ -790,16 +787,11 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
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toast_values,
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toast_isnull,
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(char *) new_data + olddata->t_hoff,
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&(newtup->t_data->t_infomask),
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has_nulls ? newtup->t_data->t_bits : NULL);
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/*
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* In the case we modified a previously modified tuple again, free the
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* memory from the previous run
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*/
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if ((char *) olddata != ((char *) newtup + HEAPTUPLESIZE))
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pfree(olddata);
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&(new_data->t_infomask),
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has_nulls ? new_data->t_bits : NULL);
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}
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else
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result_tuple = newtup;
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/*
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* Free allocated temp values
|
||||
@ -816,6 +808,8 @@ toast_insert_or_update(Relation rel, HeapTuple newtup, HeapTuple oldtup)
|
||||
for (i = 0; i < numAttrs; i++)
|
||||
if (toast_delold[i])
|
||||
toast_delete_datum(rel, toast_oldvalues[i]);
|
||||
|
||||
return result_tuple;
|
||||
}
|
||||
|
||||
|
||||
|
||||
@ -26,7 +26,7 @@
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.259 2005/11/19 20:57:44 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.260 2005/11/20 18:38:20 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -1445,16 +1445,6 @@ ExecInsert(TupleTableSlot *slot,
|
||||
estate->es_lastoid = newId;
|
||||
setLastTid(&(tuple->t_self));
|
||||
|
||||
/*
|
||||
* KLUGE SOLUTION for bug found post 8.1 release: if the tuple toaster
|
||||
* fired on the tuple then it changed the physical tuple inside the
|
||||
* tuple slot, leaving any extracted information invalid. Mark the
|
||||
* extracted state invalid just in case. Need to fix things so that
|
||||
* the toaster gets to run against the tuple before we materialize it,
|
||||
* but that's way too invasive for a stable branch.
|
||||
*/
|
||||
slot->tts_nvalid = 0;
|
||||
|
||||
/*
|
||||
* insert index entries for tuple
|
||||
*/
|
||||
@ -1709,16 +1699,6 @@ lreplace:;
|
||||
IncrReplaced();
|
||||
(estate->es_processed)++;
|
||||
|
||||
/*
|
||||
* KLUGE SOLUTION for bug found post 8.1 release: if the tuple toaster
|
||||
* fired on the tuple then it changed the physical tuple inside the
|
||||
* tuple slot, leaving any extracted information invalid. Mark the
|
||||
* extracted state invalid just in case. Need to fix things so that
|
||||
* the toaster gets to run against the tuple before we materialize it,
|
||||
* but that's way too invasive for a stable branch.
|
||||
*/
|
||||
slot->tts_nvalid = 0;
|
||||
|
||||
/*
|
||||
* Note: instead of having to update the old index tuples associated with
|
||||
* the heap tuple, all we do is form and insert new index tuples. This is
|
||||
|
||||
@ -6,7 +6,7 @@
|
||||
*
|
||||
* Copyright (c) 2000-2005, PostgreSQL Global Development Group
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/access/tuptoaster.h,v 1.23 2005/07/06 19:02:53 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/include/access/tuptoaster.h,v 1.24 2005/11/20 18:38:20 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -66,19 +66,21 @@
|
||||
|
||||
|
||||
/* ----------
|
||||
* heap_tuple_toast_attrs() -
|
||||
* toast_insert_or_update -
|
||||
*
|
||||
* Called by heap_insert(), heap_update() and heap_delete().
|
||||
* Outdates any no-longer-needed toast entries referenced
|
||||
* by oldtup and creates new ones until newtup is no more than
|
||||
* TOAST_TUPLE_TARGET (or we run out of toastable values).
|
||||
* Possibly modifies newtup by replacing the t_data part!
|
||||
*
|
||||
* oldtup is NULL if insert, newtup is NULL if delete.
|
||||
* Called by heap_insert() and heap_update().
|
||||
* ----------
|
||||
*/
|
||||
extern void heap_tuple_toast_attrs(Relation rel,
|
||||
HeapTuple newtup, HeapTuple oldtup);
|
||||
extern HeapTuple toast_insert_or_update(Relation rel,
|
||||
HeapTuple newtup, HeapTuple oldtup);
|
||||
|
||||
/* ----------
|
||||
* toast_delete -
|
||||
*
|
||||
* Called by heap_delete().
|
||||
* ----------
|
||||
*/
|
||||
extern void toast_delete(Relation rel, HeapTuple oldtup);
|
||||
|
||||
/* ----------
|
||||
* heap_tuple_fetch_attr() -
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user