Function inventory_page

src/jrd/tra.cpp:2359–2405

static ULONG inventory_page(thread_db* tdbb, ULONG sequence)
{
/**************************************
 *
 *	i n v e n t o r y _ p a g e
 *
 **************************************
 *
 * Functional description
 *	Get the physical page number of the n-th transaction inventory
 *	page. If not found, try to reconstruct using sibling pointer
 *	from last known TIP page.
 *
 **************************************/
	SET_TDBB(tdbb);
	Database* dbb = tdbb->getDatabase();
	CHECK_DBB(dbb);

	if (const ULONG pageno = dbb->getKnownPage(pag_transactions, sequence))
		return pageno;

	while (sequence >= dbb->getKnownPagesCount(pag_transactions))
	{
		DPM_scan_pages(tdbb);

		const ULONG tipCount = dbb->getKnownPagesCount(pag_transactions);
		if (sequence < tipCount)
			break;

		if (!tipCount)
			BUGCHECK(165);		// msg 165 cannot find tip page

		WIN window(DB_PAGE_SPACE, dbb->getKnownPage(pag_transactions, tipCount - 1));
		tx_inv_page* tip = (tx_inv_page*) CCH_FETCH(tdbb, &window, LCK_read, pag_transactions);
		const ULONG next = tip->tip_next;
		CCH_RELEASE(tdbb, &window);
		if (!(window.win_page = next))
			BUGCHECK(165);		// msg 165 cannot find tip page

		// Type check it
		tip = (tx_inv_page*) CCH_FETCH(tdbb, &window, LCK_read, pag_transactions);
		CCH_RELEASE(tdbb, &window);
		DPM_pages(tdbb, 0, pag_transactions, tipCount, window.win_page.getPageNum());
	}

	return dbb->getKnownPage(pag_transactions, sequence);
}


static int limbo_transaction(thread_db* tdbb, TraNumber id)