diff options
Diffstat (limited to 'src/include/access/brin_page.h')
| -rw-r--r-- | src/include/access/brin_page.h | 38 |
1 files changed, 29 insertions, 9 deletions
diff --git a/src/include/access/brin_page.h b/src/include/access/brin_page.h index 44ce5f6d1a4..6c645b34b24 100644 --- a/src/include/access/brin_page.h +++ b/src/include/access/brin_page.h @@ -20,24 +20,44 @@ #include "storage/block.h" #include "storage/itemptr.h" +/* + * Special area of BRIN pages. + * + * We define it in this odd way so that it always occupies the last + * MAXALIGN-sized element of each page. + */ +typedef struct BrinSpecialSpace +{ + uint16 vector[MAXALIGN(1) / sizeof(uint16)]; +} BrinSpecialSpace; + +/* + * Make the page type be the last half-word in the page, for consumption by + * pg_filedump and similar utilities. We don't really care much about the + * position of the "flags" half-word, but it's simpler to apply a consistent + * rule to both. + * + * See comments above GinPageOpaqueData. + */ +#define BrinPageType(page) \ + (((BrinSpecialSpace *) \ + PageGetSpecialPointer(page))->vector[MAXALIGN(1) / sizeof(uint16) - 1]) + +#define BrinPageFlags(page) \ + (((BrinSpecialSpace *) \ + PageGetSpecialPointer(page))->vector[MAXALIGN(1) / sizeof(uint16) - 2]) + /* 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) +#define BRIN_IS_REVMAP_PAGE(page) (BrinPageType(page) == BRIN_PAGETYPE_REVMAP) +#define BRIN_IS_REGULAR_PAGE(page) (BrinPageType(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 |