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..673afee
--- /dev/null
+++ b/src/include/access/gistxlog.h
@@ -0,0 +1,114 @@
+/*-------------------------------------------------------------------------
+ *
+ * gistxlog.h
+ *	  gist xlog routines
+ *
+ * Portions Copyright (c) 1996-2020, 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