src/include/access/brin_xlog.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * brin_xlog.h
   4  *        POSTGRES BRIN access XLOG definitions.
   5  *
   6  *
   7  * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
   8  * Portions Copyright (c) 1994, Regents of the University of California
   9  *
  10  * src/include/access/brin_xlog.h
  11  *
  12  *-------------------------------------------------------------------------
  13  */
  14 #ifndef BRIN_XLOG_H
  15 #define BRIN_XLOG_H
  16
  17 #include "access/xlogreader.h"
  18 #include "lib/stringinfo.h"
  19 #include "storage/bufpage.h"
  20 #include "storage/itemptr.h"
  21 #include "storage/relfilenode.h"
  22 #include "utils/relcache.h"
  23
  24
  25 /*
  26  * WAL record definitions for BRIN's WAL operations
  27  *
  28  * XLOG allows to store some information in high 4 bits of log
  29  * record xl_info field.
  30  */
  31 #define XLOG_BRIN_CREATE_INDEX          0x00
  32 #define XLOG_BRIN_INSERT                        0x10
  33 #define XLOG_BRIN_UPDATE                        0x20
  34 #define XLOG_BRIN_SAMEPAGE_UPDATE       0x30
  35 #define XLOG_BRIN_REVMAP_EXTEND         0x40
  36 #define XLOG_BRIN_DESUMMARIZE           0x50
  37
  38 #define XLOG_BRIN_OPMASK                        0x70
  39 /*
  40  * When we insert the first item on a new page, we restore the entire page in
  41  * redo.
  42  */
  43 #define XLOG_BRIN_INIT_PAGE             0x80
  44
  45 /*
  46  * This is what we need to know about a BRIN index create.
  47  *
  48  * Backup block 0: metapage
  49  */
  50 typedef struct xl_brin_createidx
  51 {
  52         BlockNumber pagesPerRange;
  53         uint16          version;
  54 } xl_brin_createidx;
  55 #define SizeOfBrinCreateIdx (offsetof(xl_brin_createidx, version) + sizeof(uint16))
  56
  57 /*
  58  * This is what we need to know about a BRIN tuple insert
  59  *
  60  * Backup block 0: main page, block data is the new BrinTuple.
  61  * Backup block 1: revmap page
  62  */
  63 typedef struct xl_brin_insert
  64 {
  65         BlockNumber heapBlk;
  66
  67         /* extra information needed to update the revmap */
  68         BlockNumber pagesPerRange;
  69
  70         /* offset number in the main page to insert the tuple to. */
  71         OffsetNumber offnum;
  72 } xl_brin_insert;
  73
  74 #define SizeOfBrinInsert        (offsetof(xl_brin_insert, offnum) + sizeof(OffsetNumber))
  75
  76 /*
  77  * A cross-page update is the same as an insert, but also stores information
  78  * about the old tuple.
  79  *
  80  * Like in xl_brin_insert:
  81  * Backup block 0: new page, block data includes the new BrinTuple.
  82  * Backup block 1: revmap page
  83  *
  84  * And in addition:
  85  * Backup block 2: old page
  86  */
  87 typedef struct xl_brin_update
  88 {
  89         /* offset number of old tuple on old page */
  90         OffsetNumber oldOffnum;
  91
  92         xl_brin_insert insert;
  93 } xl_brin_update;
  94
  95 #define SizeOfBrinUpdate        (offsetof(xl_brin_update, insert) + SizeOfBrinInsert)
  96
  97 /*
  98  * This is what we need to know about a BRIN tuple samepage update
  99  *
 100  * Backup block 0: updated page, with new BrinTuple as block data
 101  */
 102 typedef struct xl_brin_samepage_update
 103 {
 104         OffsetNumber offnum;
 105 } xl_brin_samepage_update;
 106
 107 #define SizeOfBrinSamepageUpdate                (sizeof(OffsetNumber))
 108
 109 /*
 110  * This is what we need to know about a revmap extension
 111  *
 112  * Backup block 0: metapage
 113  * Backup block 1: new revmap page
 114  */
 115 typedef struct xl_brin_revmap_extend
 116 {
 117         /*
 118          * XXX: This is actually redundant - the block number is stored as part of
 119          * backup block 1.
 120          */
 121         BlockNumber targetBlk;
 122 } xl_brin_revmap_extend;
 123
 124 #define SizeOfBrinRevmapExtend  (offsetof(xl_brin_revmap_extend, targetBlk) + \
 125                                                                  sizeof(BlockNumber))
 126
 127 /*
 128  * This is what we need to know about a range de-summarization
 129  *
 130  * Backup block 0: revmap page
 131  * Backup block 1: regular page
 132  */
 133 typedef struct xl_brin_desummarize
 134 {
 135         BlockNumber pagesPerRange;
 136         /* page number location to set to invalid */
 137         BlockNumber heapBlk;
 138         /* offset of item to delete in regular index page */
 139         OffsetNumber regOffset;
 140 } xl_brin_desummarize;
 141
 142 #define SizeOfBrinDesummarize   (offsetof(xl_brin_desummarize, regOffset) + \
 143                                                                  sizeof(OffsetNumber))
 144
 145
 146 extern void brin_redo(XLogReaderState *record);
 147 extern void brin_desc(StringInfo buf, XLogReaderState *record);
 148 extern const char *brin_identify(uint8 info);
 149 extern void brin_mask(char *pagedata, BlockNumber blkno);
 150
 151 #endif                                                  /* BRIN_XLOG_H */