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diff --git a/src/include/access/gistxlog.h b/src/include/access/gistxlog.h
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+/*-------------------------------------------------------------------------
+ *
+ * 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