112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* gistxlog.h
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* gist xlog routines
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*
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* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/access/gistxlog.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef GIST_XLOG_H
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#define GIST_XLOG_H
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#include "access/gist.h"
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#include "access/xlogreader.h"
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#include "lib/stringinfo.h"
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#define XLOG_GIST_PAGE_UPDATE 0x00
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#define XLOG_GIST_DELETE 0x10 /* delete leaf index tuples for a page */
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#define XLOG_GIST_PAGE_REUSE 0x20 /* old page is about to be reused from
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* FSM */
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#define XLOG_GIST_PAGE_SPLIT 0x30
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/* #define XLOG_GIST_INSERT_COMPLETE 0x40 */ /* not used anymore */
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/* #define XLOG_GIST_CREATE_INDEX 0x50 */ /* not used anymore */
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#define XLOG_GIST_PAGE_DELETE 0x60
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/*
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* Backup Blk 0: updated page.
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* Backup Blk 1: If this operation completes a page split, by inserting a
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* downlink for the split page, the left half of the split
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*/
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typedef struct gistxlogPageUpdate
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{
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/* number of deleted offsets */
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uint16 ntodelete;
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uint16 ntoinsert;
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/*
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* In payload of blk 0 : 1. todelete OffsetNumbers 2. tuples to insert
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*/
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} gistxlogPageUpdate;
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/*
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* Backup Blk 0: Leaf page, whose index tuples are deleted.
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*/
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typedef struct gistxlogDelete
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{
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TransactionId latestRemovedXid;
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uint16 ntodelete; /* number of deleted offsets */
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/*
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* In payload of blk 0 : todelete OffsetNumbers
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*/
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} gistxlogDelete;
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#define SizeOfGistxlogDelete (offsetof(gistxlogDelete, ntodelete) + sizeof(uint16))
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/*
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* Backup Blk 0: If this operation completes a page split, by inserting a
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* downlink for the split page, the left half of the split
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* Backup Blk 1 - npage: split pages (1 is the original page)
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*/
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typedef struct gistxlogPageSplit
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{
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BlockNumber origrlink; /* rightlink of the page before split */
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GistNSN orignsn; /* NSN of the page before split */
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bool origleaf; /* was splitted page a leaf page? */
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uint16 npage; /* # of pages in the split */
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bool markfollowright; /* set F_FOLLOW_RIGHT flags */
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/*
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* follow: 1. gistxlogPage and array of IndexTupleData per page
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*/
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} gistxlogPageSplit;
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/*
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* Backup Blk 0: page that was deleted.
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* Backup Blk 1: parent page, containing the downlink to the deleted page.
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*/
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typedef struct gistxlogPageDelete
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{
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TransactionId deleteXid; /* last Xid which could see page in scan */
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OffsetNumber downlinkOffset; /* Offset of downlink referencing this page */
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} gistxlogPageDelete;
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#define SizeOfGistxlogPageDelete (offsetof(gistxlogPageDelete, downlinkOffset) + sizeof(OffsetNumber))
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/*
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* This is what we need to know about page reuse, for hot standby.
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*/
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typedef struct gistxlogPageReuse
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{
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RelFileNode node;
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BlockNumber block;
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TransactionId latestRemovedXid;
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} gistxlogPageReuse;
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#define SizeOfGistxlogPageReuse (offsetof(gistxlogPageReuse, latestRemovedXid) + sizeof(TransactionId))
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extern void gist_redo(XLogReaderState *record);
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extern void gist_desc(StringInfo buf, XLogReaderState *record);
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extern const char *gist_identify(uint8 info);
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extern void gist_xlog_startup(void);
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extern void gist_xlog_cleanup(void);
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extern void gist_mask(char *pagedata, BlockNumber blkno);
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#endif
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