Function blinsert

contrib/bloom/blinsert.c:198–368

* Insert new tuple to the bloom index. */

 * Insert new tuple to the bloom index.
 */
bool
blinsert(Relation index, Datum *values, bool *isnull,
		 ItemPointer ht_ctid, Relation heapRel,
		 IndexUniqueCheck checkUnique,
		 bool indexUnchanged,
		 IndexInfo *indexInfo)
{
	BloomState	blstate;
	BloomTuple *itup;
	MemoryContext oldCtx;
	MemoryContext insertCtx;
	BloomMetaPageData *metaData;
	Buffer		buffer,
				metaBuffer;
	Page		page,
				metaPage;
	BlockNumber blkno = InvalidBlockNumber;
	OffsetNumber nStart;
	GenericXLogState *state;

	insertCtx = AllocSetContextCreate(CurrentMemoryContext,
									  "Bloom insert temporary context",
									  ALLOCSET_DEFAULT_SIZES);

	oldCtx = MemoryContextSwitchTo(insertCtx);

	initBloomState(&blstate, index);
	itup = BloomFormTuple(&blstate, ht_ctid, values, isnull);

	/*
	 * At first, try to insert new tuple to the first page in notFullPage
	 * array.  If successful, we don't need to modify the meta page.
	 */
	metaBuffer = ReadBuffer(index, BLOOM_METAPAGE_BLKNO);
	LockBuffer(metaBuffer, BUFFER_LOCK_SHARE);
	metaData = BloomPageGetMeta(BufferGetPage(metaBuffer));

	if (metaData->nEnd > metaData->nStart)
	{
		Page		page;

		blkno = metaData->notFullPage[metaData->nStart];
		Assert(blkno != InvalidBlockNumber);

		/* Don't hold metabuffer lock while doing insert */
		LockBuffer(metaBuffer, BUFFER_LOCK_UNLOCK);

		buffer = ReadBuffer(index, blkno);
		LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);

		state = GenericXLogStart(index);
		page = GenericXLogRegisterBuffer(state, buffer, 0);

		/*
		 * We might have found a page that was recently deleted by VACUUM.  If
		 * so, we can reuse it, but we must reinitialize it.
		 */
		if (PageIsNew(page) || BloomPageIsDeleted(page))