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Redefine the lp_flags field of item pointers as having four states, rather

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than two independent bits (one of which was never used in heap pages anyway,
or at least hadn't been in a very long time).  This gives us flexibility to
add the HOT notions of redirected and dead item pointers without requiring
anything so klugy as magic values of lp_off and lp_len.  The state values
are chosen so that for the states currently in use (pre-HOT) there is no
change in the physical representation.
This commit is contained in:
Tom Lane
2007-09-12 22:10:26 +00:00
parent eb0a7735ba
commit 6889303531
31 changed files with 278 additions and 185 deletions
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6
src/backend/commands/sequence.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/sequence.c,v 1.144 2007/09/05 18:10:47 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/sequence.c,v 1.145 2007/09/12 22:10:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -936,7 +936,7 @@ read_info(SeqTable elm, Relation rel, Buffer *buf)
RelationGetRelationName(rel), sm->magic);
lp = PageGetItemId(page, FirstOffsetNumber);
Assert(ItemIdIsUsed(lp));
Assert(ItemIdIsNormal(lp));
tuple.t_data = (HeapTupleHeader) PageGetItem((Page) page, lp);
seq = (Form_pg_sequence) GETSTRUCT(&tuple);
@ -1281,7 +1281,7 @@ seq_redo(XLogRecPtr lsn, XLogRecord *record)
itemsz = record->xl_len - sizeof(xl_seq_rec);
itemsz = MAXALIGN(itemsz);
if (PageAddItem(page, (Item) item, itemsz,
FirstOffsetNumber, LP_USED) == InvalidOffsetNumber)
FirstOffsetNumber, false) == InvalidOffsetNumber)
elog(PANIC, "seq_redo: failed to add item to page");
PageSetLSN(page, lsn);