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Diffstat (limited to 'src/include/access/gistxlog.h')
-rw-r--r-- | src/include/access/gistxlog.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/src/include/access/gistxlog.h b/src/include/access/gistxlog.h new file mode 100644 index 0000000..fd5144f --- /dev/null +++ b/src/include/access/gistxlog.h @@ -0,0 +1,114 @@ +/*------------------------------------------------------------------------- + * + * gistxlog.h + * gist xlog routines + * + * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * src/include/access/gistxlog.h + * + *------------------------------------------------------------------------- + */ +#ifndef GIST_XLOG_H +#define GIST_XLOG_H + +#include "access/gist.h" +#include "access/xlogreader.h" +#include "lib/stringinfo.h" + +#define XLOG_GIST_PAGE_UPDATE 0x00 +#define XLOG_GIST_DELETE 0x10 /* delete leaf index tuples for a + * page */ +#define XLOG_GIST_PAGE_REUSE 0x20 /* old page is about to be reused + * from FSM */ +#define XLOG_GIST_PAGE_SPLIT 0x30 + /* #define XLOG_GIST_INSERT_COMPLETE 0x40 */ /* not used anymore */ + /* #define XLOG_GIST_CREATE_INDEX 0x50 */ /* not used anymore */ +#define XLOG_GIST_PAGE_DELETE 0x60 +#define XLOG_GIST_ASSIGN_LSN 0x70 /* nop, assign new LSN */ + +/* + * Backup Blk 0: updated page. + * Backup Blk 1: If this operation completes a page split, by inserting a + * downlink for the split page, the left half of the split + */ +typedef struct gistxlogPageUpdate +{ + /* number of deleted offsets */ + uint16 ntodelete; + uint16 ntoinsert; + + /* + * In payload of blk 0 : 1. todelete OffsetNumbers 2. tuples to insert + */ +} gistxlogPageUpdate; + +/* + * Backup Blk 0: Leaf page, whose index tuples are deleted. + */ +typedef struct gistxlogDelete +{ + TransactionId latestRemovedXid; + uint16 ntodelete; /* number of deleted offsets */ + + /* + * In payload of blk 0 : todelete OffsetNumbers + */ +} gistxlogDelete; + +#define SizeOfGistxlogDelete (offsetof(gistxlogDelete, ntodelete) + sizeof(uint16)) + +/* + * Backup Blk 0: If this operation completes a page split, by inserting a + * downlink for the split page, the left half of the split + * Backup Blk 1 - npage: split pages (1 is the original page) + */ +typedef struct gistxlogPageSplit +{ + BlockNumber origrlink; /* rightlink of the page before split */ + GistNSN orignsn; /* NSN of the page before split */ + bool origleaf; /* was splitted page a leaf page? */ + + uint16 npage; /* # of pages in the split */ + bool markfollowright; /* set F_FOLLOW_RIGHT flags */ + + /* + * follow: 1. gistxlogPage and array of IndexTupleData per page + */ +} gistxlogPageSplit; + +/* + * Backup Blk 0: page that was deleted. + * Backup Blk 1: parent page, containing the downlink to the deleted page. + */ +typedef struct gistxlogPageDelete +{ + FullTransactionId deleteXid; /* last Xid which could see page in scan */ + OffsetNumber downlinkOffset; /* Offset of downlink referencing this + * page */ +} gistxlogPageDelete; + +#define SizeOfGistxlogPageDelete (offsetof(gistxlogPageDelete, downlinkOffset) + sizeof(OffsetNumber)) + + +/* + * This is what we need to know about page reuse, for hot standby. + */ +typedef struct gistxlogPageReuse +{ + RelFileNode node; + BlockNumber block; + FullTransactionId latestRemovedFullXid; +} gistxlogPageReuse; + +#define SizeOfGistxlogPageReuse (offsetof(gistxlogPageReuse, latestRemovedFullXid) + sizeof(FullTransactionId)) + +extern void gist_redo(XLogReaderState *record); +extern void gist_desc(StringInfo buf, XLogReaderState *record); +extern const char *gist_identify(uint8 info); +extern void gist_xlog_startup(void); +extern void gist_xlog_cleanup(void); +extern void gist_mask(char *pagedata, BlockNumber blkno); + +#endif |