Function write_page

src/jrd/cch.cpp:4863–5079

static bool write_page(thread_db* tdbb, BufferDesc* bdb, FbStatusVector* const status, const bool inAst)
{
/**************************************
 *
 *	w r i t e _ p a g e
 *
 **************************************
 *
 * Functional description
 *	Do actions required when writing a database page,
 *	including journaling, shadowing.
 *
 **************************************/

	CCH_TRACE(("WRITE   %d:%06d", bdb->bdb_page.getPageSpaceID(), bdb->bdb_page.getPageNum()));

	// hvlad: why it is needed in Vulcan ???
	//Sync syncWrite(&bcb->bcb_syncPageWrite, "write_page");
	//syncWrite.lock(SYNC_EXCLUSIVE);

	if (bdb->bdb_flags & BDB_not_valid)
	{
		ERR_build_status(status, Arg::Gds(isc_buf_invalid) << Arg::Num(bdb->bdb_page.getPageNum()));
		return false;
	}

	Database* const dbb = tdbb->getDatabase();
	pag* const page = bdb->bdb_buffer;

	// Before writing db header page, make sure that
	// the next_transaction > oldest_active transaction
	if (bdb->bdb_page == HEADER_PAGE_NUMBER)
	{
		const header_page* const header = (header_page*) page;

		const TraNumber next_transaction = Ods::getNT(header);
		const TraNumber oldest_active = Ods::getOAT(header);
		const TraNumber oldest_transaction = Ods::getOIT(header);

		if (next_transaction)
		{
			if (oldest_active > next_transaction)
				BUGCHECK(266);	// next transaction older than oldest active

			if (oldest_transaction > next_transaction)
				BUGCHECK(267);	// next transaction older than oldest transaction
		}
	}

	page->pag_generation++;
	bool result = true;

	//if (!dbb->dbb_wal || write_thru) becomes
	//if (true || write_thru) then finally if (true)
	// I won't wipe out the if() itself to allow my changes be verified easily by others
	if (true)
	{
		tdbb->bumpStats(RuntimeStatistics::PAGE_WRITES);