/*
* Build an empty SPGiST index in the initialization fork
*/
Datum
spgbuildempty(PG_FUNCTION_ARGS)
{
Relation index = (Relation) PG_GETARG_POINTER(0);
Page page;
/* Construct metapage. */
page = (Page) palloc(BLCKSZ);
SpGistInitMetapage(page);
/* Write the page. If archiving/streaming, XLOG it. */
smgrwrite(index->rd_smgr, INIT_FORKNUM, SPGIST_METAPAGE_BLKNO,
(char *) page, true);
if (XLogIsNeeded())
log_newpage(&index->rd_smgr->smgr_rnode.node, INIT_FORKNUM,
SPGIST_METAPAGE_BLKNO, page);
/* Likewise for the root page. */
SpGistInitPage(page, SPGIST_LEAF);
smgrwrite(index->rd_smgr, INIT_FORKNUM, SPGIST_HEAD_BLKNO,
(char *) page, true);
if (XLogIsNeeded())
log_newpage(&index->rd_smgr->smgr_rnode.node, INIT_FORKNUM,
SPGIST_HEAD_BLKNO, page);
/*
* An immediate sync is required even if we xlog'd the pages, because the
* writes 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);
PG_RETURN_VOID();
}
/*
* Build an empty SPGiST index in the initialization fork
*/
void
spgbuildempty(Relation index)
{
Page page;
/* Construct metapage. */
page = (Page) palloc(BLCKSZ);
SpGistInitMetapage(page);
/* Write the page. If archiving/streaming, XLOG it. */
PageSetChecksumInplace(page, SPGIST_METAPAGE_BLKNO);
smgrwrite(index->rd_smgr, INIT_FORKNUM, SPGIST_METAPAGE_BLKNO,
(char *) page, true);
if (XLogIsNeeded())
log_newpage(&index->rd_smgr->smgr_rnode.node, INIT_FORKNUM,
SPGIST_METAPAGE_BLKNO, page, false);
/* Likewise for the root page. */
SpGistInitPage(page, SPGIST_LEAF);
PageSetChecksumInplace(page, SPGIST_ROOT_BLKNO);
smgrwrite(index->rd_smgr, INIT_FORKNUM, SPGIST_ROOT_BLKNO,
(char *) page, true);
if (XLogIsNeeded())
log_newpage(&index->rd_smgr->smgr_rnode.node, INIT_FORKNUM,
SPGIST_ROOT_BLKNO, page, true);
/* Likewise for the null-tuples root page. */
SpGistInitPage(page, SPGIST_LEAF | SPGIST_NULLS);
PageSetChecksumInplace(page, SPGIST_NULL_BLKNO);
smgrwrite(index->rd_smgr, INIT_FORKNUM, SPGIST_NULL_BLKNO,
(char *) page, true);
if (XLogIsNeeded())
log_newpage(&index->rd_smgr->smgr_rnode.node, INIT_FORKNUM,
SPGIST_NULL_BLKNO, page, true);
/*
* An immediate sync is required even if we xlog'd the pages, because the
* writes 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);
}
void
SpGistInitMetabuffer(Buffer b, Relation index)
{
SpGistMetaPageData *metadata;
Page page = BufferGetPage(b);
SpGistInitPage(page, SPGIST_META, BufferGetPageSize(b));
metadata = SpGistPageGetMeta(page);
memset(metadata, 0, sizeof(SpGistMetaPageData));
metadata->magickNumber = SPGIST_MAGICK_NUMBER;
}
/*
* Initialize metadata page
*/
void
SpGistInitMetapage(Page page)
{
SpGistMetaPageData *metadata;
int i;
SpGistInitPage(page, SPGIST_META);
metadata = SpGistPageGetMeta(page);
memset(metadata, 0, sizeof(SpGistMetaPageData));
metadata->magicNumber = SPGIST_MAGIC_NUMBER;
/* initialize last-used-page cache to empty */
for (i = 0; i < SPGIST_CACHED_PAGES; i++)
metadata->lastUsedPages.cachedPage[i].blkno = InvalidBlockNumber;
}
/*
* Initialize metadata page
*/
void
SpGistInitMetapage(Page page)
{
SpGistMetaPageData *metadata;
SpGistInitPage(page, SPGIST_META);
metadata = SpGistPageGetMeta(page);
memset(metadata, 0, sizeof(SpGistMetaPageData));
metadata->magicNumber = SPGIST_MAGIC_NUMBER;
/* initialize last-used-page cache to empty */
metadata->lastUsedPages.innerPage[0].blkno = InvalidBlockNumber;
metadata->lastUsedPages.innerPage[1].blkno = InvalidBlockNumber;
metadata->lastUsedPages.innerPage[2].blkno = InvalidBlockNumber;
metadata->lastUsedPages.leafPage.blkno = InvalidBlockNumber;
}
void
SpGistInitBuffer(Buffer b, uint16 f)
{
SpGistInitPage(BufferGetPage(b), f, BufferGetPageSize(b));
}
/*
* Initialize a buffer's page to empty, with specified flags
*/
void
SpGistInitBuffer(Buffer b, uint16 f)
{
Assert(BufferGetPageSize(b) == BLCKSZ);
SpGistInitPage(BufferGetPage(b), f);
}
