/*
* Build an empty bloom index in the initialization fork.
*/
void
blbuildempty(Relation index)
{
Page metapage;
/* Construct metapage. */
metapage = (Page) palloc(BLCKSZ);
BloomFillMetapage(index, metapage);
/*
* Write the page and log it. It might seem that an immediate sync would
* be sufficient to guarantee that the file exists on disk, but recovery
* itself might remove it while replaying, for example, an
* XLOG_DBASE_CREATE or XLOG_TBLSPC_CREATE record. Therefore, we need
* this even when wal_level=minimal.
*/
PageSetChecksumInplace(metapage, BLOOM_METAPAGE_BLKNO);
smgrwrite(index->rd_smgr, INIT_FORKNUM, BLOOM_METAPAGE_BLKNO,
(char *) metapage, true);
log_newpage(&index->rd_smgr->smgr_rnode.node, INIT_FORKNUM,
BLOOM_METAPAGE_BLKNO, metapage, true);
/*
* An immediate sync is required even if we xlog'd the page, because the
* write did not go through shared_buffers and therefore a concurrent
* checkpoint may have moved the redo pointer past our xlog record.
*/
smgrimmedsync(index->rd_smgr, INIT_FORKNUM);
}
/*
* Initialize metapage for bloom index.
*/
void
BloomInitMetapage(Relation index)
{
Buffer metaBuffer;
Page metaPage;
GenericXLogState *state;
/*
* Make a new page; since it is first page it should be associated with
* block number 0 (BLOOM_METAPAGE_BLKNO).
*/
metaBuffer = BloomNewBuffer(index);
Assert(BufferGetBlockNumber(metaBuffer) == BLOOM_METAPAGE_BLKNO);
/* Initialize contents of meta page */
state = GenericXLogStart(index);
metaPage = GenericXLogRegisterBuffer(state, metaBuffer,
GENERIC_XLOG_FULL_IMAGE);
BloomFillMetapage(index, metaPage);
GenericXLogFinish(state);
UnlockReleaseBuffer(metaBuffer);
}
