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/*
* brin_page.h
* Prototypes and definitions for BRIN page layouts
*
* Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/include/access/brin_page.h
*
* NOTES
*
* These structs should really be private to specific BRIN files, but it's
* useful to have them here so that they can be used by pageinspect and similar
* tools.
*/
#ifndef BRIN_PAGE_H
#define BRIN_PAGE_H
#include "storage/block.h"
#include "storage/itemptr.h"
/* special space on all BRIN pages stores a "type" identifier */
#define BRIN_PAGETYPE_META 0xF091
#define BRIN_PAGETYPE_REVMAP 0xF092
#define BRIN_PAGETYPE_REGULAR 0xF093
#define BRIN_PAGE_TYPE(page) \
(((BrinSpecialSpace *) PageGetSpecialPointer(page))->type)
#define BRIN_IS_REVMAP_PAGE(page) (BRIN_PAGE_TYPE(page) == BRIN_PAGETYPE_REVMAP)
#define BRIN_IS_REGULAR_PAGE(page) (BRIN_PAGE_TYPE(page) == BRIN_PAGETYPE_REGULAR)
/* flags for BrinSpecialSpace */
#define BRIN_EVACUATE_PAGE (1 << 0)
typedef struct BrinSpecialSpace
{
uint16 flags;
uint16 type;
} BrinSpecialSpace;
/* Metapage definitions */
typedef struct BrinMetaPageData
{
uint32 brinMagic;
uint32 brinVersion;
BlockNumber pagesPerRange;
BlockNumber lastRevmapPage;
} BrinMetaPageData;
#define BRIN_CURRENT_VERSION 1
#define BRIN_META_MAGIC 0xA8109CFA
#define BRIN_METAPAGE_BLKNO 0
/* Definitions for revmap pages */
typedef struct RevmapContents
{
ItemPointerData rm_tids[1]; /* really REVMAP_PAGE_MAXITEMS */
} RevmapContents;
#define REVMAP_CONTENT_SIZE \
(BLCKSZ - MAXALIGN(SizeOfPageHeaderData) - \
offsetof(RevmapContents, rm_tids) - \
MAXALIGN(sizeof(BrinSpecialSpace)))
/* max num of items in the array */
#define REVMAP_PAGE_MAXITEMS \
(REVMAP_CONTENT_SIZE / sizeof(ItemPointerData))
#endif /* BRIN_PAGE_H */
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