6251   MemPage *pPrevTrunk = 0;  in allocateBtreePage()  local
6305       pPrevTrunk = pTrunk;  in allocateBtreePage()
6306       if( pPrevTrunk ){  in allocateBtreePage()
6310         iTrunk = get4byte(&pPrevTrunk->aData[0]);  in allocateBtreePage()
6319         rc = SQLITE_CORRUPT_PGNO(pPrevTrunk ? pPrevTrunk->pgno : 1);  in allocateBtreePage()
6336         assert( pPrevTrunk==0 );  in allocateBtreePage()
6365           if( !pPrevTrunk ){  in allocateBtreePage()
6368             rc = sqlite3PagerWrite(pPrevTrunk->pDbPage);  in allocateBtreePage()
6372             memcpy(&pPrevTrunk->aData[0], &pTrunk->aData[0], 4);  in allocateBtreePage()
6399           if( !pPrevTrunk ){  in allocateBtreePage()
6403             rc = sqlite3PagerWrite(pPrevTrunk->pDbPage);  in allocateBtreePage()
6407             put4byte(&pPrevTrunk->aData[0], iNewTrunk);  in allocateBtreePage()
6477       releasePage(pPrevTrunk);  in allocateBtreePage()
6478       pPrevTrunk = 0;  in allocateBtreePage()
6543   releasePage(pPrevTrunk);  in allocateBtreePage()