Method extendDatabase

src/jrd/nbak.cpp:383–428

bool BackupManager::extendDatabase(thread_db* tdbb)
{
	if (!alloc_table)
	{
		LocalAllocWriteGuard localAllocGuard(this);
		actualizeAlloc(tdbb, false);
	}

	ULONG maxPage = 0;
	{
		LocalAllocReadGuard localAllocGuard(this);
		AllocItemTree::Accessor all(alloc_table);

		if (all.getFirst())
		{
			do
			{
				const ULONG pg = all.current().db_page;
				if (maxPage < pg)
					maxPage = pg;
			} while (all.getNext());
		}
	}

	PageSpace *pgSpace = database->dbb_page_manager.findPageSpace(DB_PAGE_SPACE);
	ULONG maxAllocPage = pgSpace->maxAlloc();
	if (maxAllocPage >= maxPage)
		return true;

	if (!pgSpace->extend(tdbb, maxPage, true))
		return false;

	maxAllocPage = pgSpace->maxAlloc();
	while (maxAllocPage < maxPage)
	{
		const USHORT ret = PIO_init_data(tdbb, pgSpace->file, tdbb->tdbb_status_vector,
										 maxAllocPage, 256);

		if (ret != 256)
			return false;

		maxAllocPage += ret;
	}

	return true;
}


// Merge difference file to main files (if needed) and unlink() difference