There already was a macro PageGetItemId; this is now used in (almost)
all places, where pd_linp is accessed. Also introduce new macros SizeOfPageHeaderData and BTMaxItemSize. This is just source code cosmetic, no behaviour changed. Manfred Koizar
This commit is contained in:
parent
8864603f3c
commit
33f1687879
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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/heapam.c,v 1.140 2002/07/02 05:46:14 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.141 2002/07/02 05:48:44 momjian Exp $
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*
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*
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* INTERFACE ROUTINES
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@ -2067,7 +2067,7 @@ heap_xlog_clean(bool redo, XLogRecPtr lsn, XLogRecord *record)
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while ((char *) unused < unend)
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{
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lp = ((PageHeader) page)->pd_linp + *unused;
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lp = PageGetItemId(page, *unused + 1);
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lp->lp_flags &= ~LP_USED;
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unused++;
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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/nbtree/nbtinsert.c,v 1.93 2002/06/20 20:29:25 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.94 2002/07/02 05:48:44 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -383,10 +383,9 @@ _bt_insertonpg(Relation rel,
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* to 1/3 the per-page available space. Note that at this point,
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* itemsz doesn't include the ItemId.
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*/
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if (itemsz > (PageGetPageSize(page) - sizeof(PageHeaderData) - MAXALIGN(sizeof(BTPageOpaqueData))) / 3 - sizeof(ItemIdData))
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if (itemsz > BTMaxItemSize(page))
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elog(ERROR, "btree: index item size %lu exceeds maximum %lu",
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(unsigned long) itemsz,
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(PageGetPageSize(page) - sizeof(PageHeaderData) - MAXALIGN(sizeof(BTPageOpaqueData))) / 3 - sizeof(ItemIdData));
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(unsigned long) itemsz, BTMaxItemSize(page));
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/*
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* Determine exactly where new item will go.
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@ -1020,9 +1019,8 @@ _bt_findsplitloc(Relation rel,
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/* Total free space available on a btree page, after fixed overhead */
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leftspace = rightspace =
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PageGetPageSize(page) - sizeof(PageHeaderData) -
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MAXALIGN(sizeof(BTPageOpaqueData))
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+sizeof(ItemIdData);
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PageGetPageSize(page) - SizeOfPageHeaderData -
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MAXALIGN(sizeof(BTPageOpaqueData));
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/*
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* Finding the best possible split would require checking all the
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@ -35,7 +35,7 @@
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtsort.c,v 1.64 2002/06/20 20:29:25 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtsort.c,v 1.65 2002/07/02 05:48:44 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -346,10 +346,9 @@ _bt_buildadd(Relation index, BTPageState *state, BTItem bti)
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* oversize items being inserted into an already-existing index. But
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* during creation of an index, we don't go through there.
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*/
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if (btisz > (PageGetPageSize(npage) - sizeof(PageHeaderData) - MAXALIGN(sizeof(BTPageOpaqueData))) / 3 - sizeof(ItemIdData))
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if (btisz > BTMaxItemSize(npage))
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elog(ERROR, "btree: index item size %lu exceeds maximum %ld",
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(unsigned long) btisz,
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(PageGetPageSize(npage) - sizeof(PageHeaderData) - MAXALIGN(sizeof(BTPageOpaqueData))) / 3 - sizeof(ItemIdData));
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(unsigned long) btisz, BTMaxItemSize(npage));
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if (pgspc < btisz || pgspc < state->btps_full)
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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/storage/page/bufpage.c,v 1.45 2002/06/20 20:29:35 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/storage/page/bufpage.c,v 1.46 2002/07/02 05:48:44 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -37,13 +37,12 @@ PageInit(Page page, Size pageSize, Size specialSize)
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specialSize = MAXALIGN(specialSize);
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Assert(pageSize == BLCKSZ);
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Assert(pageSize >
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specialSize + sizeof(PageHeaderData) - sizeof(ItemIdData));
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Assert(pageSize > specialSize + SizeOfPageHeaderData);
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/* Make sure all fields of page are zero, as well as unused space */
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MemSet(p, 0, pageSize);
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p->pd_lower = sizeof(PageHeaderData) - sizeof(ItemIdData);
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p->pd_lower = SizeOfPageHeaderData;
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p->pd_upper = pageSize - specialSize;
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p->pd_special = pageSize - specialSize;
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PageSetPageSize(page, pageSize);
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@ -88,7 +87,7 @@ PageAddItem(Page page,
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/*
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* Be wary about corrupted page pointers
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*/
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if (phdr->pd_lower < (sizeof(PageHeaderData) - sizeof(ItemIdData)) ||
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if (phdr->pd_lower < SizeOfPageHeaderData ||
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phdr->pd_lower > phdr->pd_upper ||
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phdr->pd_upper > phdr->pd_special ||
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phdr->pd_special > BLCKSZ)
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@ -112,7 +111,7 @@ PageAddItem(Page page,
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}
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if (offsetNumber < limit)
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{
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itemId = &phdr->pd_linp[offsetNumber - 1];
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itemId = PageGetItemId(phdr, offsetNumber);
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if (((*itemId).lp_flags & LP_USED) ||
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((*itemId).lp_len != 0))
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{
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@ -136,7 +135,7 @@ PageAddItem(Page page,
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/* look for "recyclable" (unused & deallocated) ItemId */
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for (offsetNumber = 1; offsetNumber < limit; offsetNumber++)
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{
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itemId = &phdr->pd_linp[offsetNumber - 1];
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itemId = PageGetItemId(phdr, offsetNumber);
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if ((((*itemId).lp_flags & LP_USED) == 0) &&
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((*itemId).lp_len == 0))
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break;
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@ -150,7 +149,7 @@ PageAddItem(Page page,
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* alignedSize > pd_upper.
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*/
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if (offsetNumber > limit)
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lower = (char *) (&phdr->pd_linp[offsetNumber]) - (char *) page;
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lower = (char *) PageGetItemId(phdr, offsetNumber + 1) - (char *) page;
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else if (offsetNumber == limit || needshuffle)
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lower = phdr->pd_lower + sizeof(ItemIdData);
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else
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@ -175,13 +174,13 @@ PageAddItem(Page page,
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ItemId fromitemId,
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toitemId;
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fromitemId = &phdr->pd_linp[i - 1];
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toitemId = &phdr->pd_linp[i];
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fromitemId = PageGetItemId(phdr, i);
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toitemId = PageGetItemId(phdr, i + 1);
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*toitemId = *fromitemId;
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}
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}
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itemId = &phdr->pd_linp[offsetNumber - 1];
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itemId = PageGetItemId(phdr, offsetNumber);
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(*itemId).lp_off = upper;
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(*itemId).lp_len = size;
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(*itemId).lp_flags = flags;
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@ -214,12 +213,12 @@ PageGetTempPage(Page page, Size specialSize)
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memcpy(temp, page, pageSize);
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/* clear out the middle */
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size = (pageSize - sizeof(PageHeaderData)) + sizeof(ItemIdData);
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size = pageSize - SizeOfPageHeaderData;
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size -= MAXALIGN(specialSize);
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MemSet((char *) &(thdr->pd_linp[0]), 0, size);
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MemSet(PageGetContents(thdr), 0, size);
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/* set high, low water marks */
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thdr->pd_lower = sizeof(PageHeaderData) - sizeof(ItemIdData);
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thdr->pd_lower = SizeOfPageHeaderData;
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thdr->pd_upper = pageSize - MAXALIGN(specialSize);
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return temp;
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@ -291,7 +290,7 @@ PageRepairFragmentation(Page page, OffsetNumber *unused)
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* pointers, lengths, etc could cause us to clobber adjacent disk
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* buffers, spreading the data loss further. So, check everything.
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*/
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if (pd_lower < (sizeof(PageHeaderData) - sizeof(ItemIdData)) ||
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if (pd_lower < SizeOfPageHeaderData ||
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pd_lower > pd_upper ||
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pd_upper > pd_special ||
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pd_special > BLCKSZ ||
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@ -303,7 +302,7 @@ PageRepairFragmentation(Page page, OffsetNumber *unused)
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nused = 0;
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for (i = 0; i < nline; i++)
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{
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lp = ((PageHeader) page)->pd_linp + i;
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lp = PageGetItemId(page, i + 1);
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if ((*lp).lp_flags & LP_DELETE) /* marked for deletion */
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(*lp).lp_flags &= ~(LP_USED | LP_DELETE);
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if ((*lp).lp_flags & LP_USED)
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@ -317,7 +316,7 @@ PageRepairFragmentation(Page page, OffsetNumber *unused)
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/* Page is completely empty, so just reset it quickly */
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for (i = 0; i < nline; i++)
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{
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lp = ((PageHeader) page)->pd_linp + i;
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lp = PageGetItemId(page, i + 1);
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(*lp).lp_len = 0; /* indicate unused & deallocated */
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}
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((PageHeader) page)->pd_upper = pd_special;
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@ -331,7 +330,7 @@ PageRepairFragmentation(Page page, OffsetNumber *unused)
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totallen = 0;
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for (i = 0; i < nline; i++)
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{
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lp = ((PageHeader) page)->pd_linp + i;
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lp = PageGetItemId(page, i + 1);
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if ((*lp).lp_flags & LP_USED)
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{
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itemidptr->offsetindex = i;
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@ -363,7 +362,7 @@ PageRepairFragmentation(Page page, OffsetNumber *unused)
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for (i = 0, itemidptr = itemidbase; i < nused; i++, itemidptr++)
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{
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lp = ((PageHeader) page)->pd_linp + itemidptr->offsetindex;
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lp = PageGetItemId(page, itemidptr->offsetindex + 1);
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upper -= itemidptr->alignedlen;
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memmove((char *) page + upper,
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(char *) page + itemidptr->itemoff,
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@ -426,7 +425,7 @@ PageIndexTupleDelete(Page page, OffsetNumber offnum)
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/*
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* As with PageRepairFragmentation, paranoia seems justified.
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*/
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if (phdr->pd_lower < (sizeof(PageHeaderData) - sizeof(ItemIdData)) ||
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if (phdr->pd_lower < SizeOfPageHeaderData ||
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phdr->pd_lower > phdr->pd_upper ||
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phdr->pd_upper > phdr->pd_special ||
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phdr->pd_special > BLCKSZ)
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@ -452,6 +451,8 @@ PageIndexTupleDelete(Page page, OffsetNumber offnum)
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/*
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* First, we want to get rid of the pd_linp entry for the index tuple.
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* We copy all subsequent linp's back one slot in the array.
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* We don't use PageGetItemId, because we are manipulating the _array_,
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* not individual linp's.
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*/
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nbytes = phdr->pd_lower -
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((char *) &phdr->pd_linp[offidx + 1] - (char *) phdr);
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@ -490,8 +491,8 @@ PageIndexTupleDelete(Page page, OffsetNumber offnum)
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nline--; /* there's one less than when we started */
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for (i = nline; --i >= 0; )
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{
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if (phdr->pd_linp[i].lp_off <= offset)
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phdr->pd_linp[i].lp_off += size;
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if (PageGetItemId(phdr, i + 1)->lp_off <= offset)
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PageGetItemId(phdr, i + 1)->lp_off += size;
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}
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}
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}
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: nbtree.h,v 1.62 2002/06/20 20:29:43 momjian Exp $
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* $Id: nbtree.h,v 1.63 2002/07/02 05:48:44 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -65,7 +65,7 @@ typedef struct BTMetaPageData
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} BTMetaPageData;
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#define BTPageGetMeta(p) \
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((BTMetaPageData *) &((PageHeader) p)->pd_linp[0])
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((BTMetaPageData *) PageGetContents(p))
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#define BTREE_METAPAGE 0 /* first page is meta */
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#define BTREE_MAGIC 0x053162 /* magic number of btree pages */
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@ -76,6 +76,14 @@ typedef struct BTMetaPageData
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#define BTREE_VERSION 1
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/*
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* We actually need to be able to fit three items on every page,
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* so restrict any one item to 1/3 the per-page available space.
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*/
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#define BTMaxItemSize(page) \
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((PageGetPageSize(page) - \
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sizeof(PageHeaderData) - \
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MAXALIGN(sizeof(BTPageOpaqueData))) / 3 - sizeof(ItemIdData))
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/*
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* BTScanOpaqueData is used to remember which buffers we're currently
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* examining in the scan. We keep these buffers pinned (but not locked,
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: bufpage.h,v 1.48 2002/06/20 20:29:52 momjian Exp $
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* $Id: bufpage.h,v 1.49 2002/07/02 05:48:44 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -157,13 +157,17 @@ typedef enum
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((bool) (((PageHeader) (page))->pd_lower != 0)) \
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)
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/*
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* line pointer does not count as part of header
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*/
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#define SizeOfPageHeaderData (offsetof(PageHeaderData, pd_linp[0]))
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/*
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* PageIsEmpty
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* returns true iff no itemid has been allocated on the page
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*/
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#define PageIsEmpty(page) \
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(((PageHeader) (page))->pd_lower <= \
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(sizeof(PageHeaderData) - sizeof(ItemIdData)))
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(((PageHeader) (page))->pd_lower <= SizeOfPageHeaderData)
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/*
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* PageIsNew
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@ -179,6 +183,13 @@ typedef enum
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#define PageGetItemId(page, offsetNumber) \
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((ItemId) (&((PageHeader) (page))->pd_linp[(offsetNumber) - 1]))
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/*
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* PageGetContents
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* To be used in case the page does not contain item pointers.
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*/
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#define PageGetContents(page) \
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((char *) (&((PageHeader) (page))->pd_linp[0]))
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/* ----------------
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* macros to access opaque space
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* ----------------
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@ -290,8 +301,7 @@ typedef enum
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* That way we get -1 or so, not a huge positive number...
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*/
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#define PageGetMaxOffsetNumber(page) \
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(((int) (((PageHeader) (page))->pd_lower - \
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(sizeof(PageHeaderData) - sizeof(ItemIdData)))) \
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(((int) (((PageHeader) (page))->pd_lower - SizeOfPageHeaderData)) \
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/ ((int) sizeof(ItemIdData)))
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#define PageGetLSN(page) \
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