Split index xlog headers from other private index headers.

The xlog-specific headers need to be included in both frontend code -
specifically, pg_waldump - and the backend, but the remainder of the
private headers for each index are only needed by the backend.  By
splitting the xlog stuff out into separate headers, pg_waldump pulls
in fewer backend headers, which is a good thing.

Patch by me, reviewed by Michael Paquier and Andres Freund, per a
complaint from Dilip Kumar.

Discussion: http://postgr.es/m/CA+TgmoZ=F=GkxV0YEv-A8tb+AEGy_Qa7GSiJ8deBKFATnzfEug@mail.gmail.com

1 files changed, 69 insertions, 0 deletions

diff --git a/src/include/access/gistxlog.h b/src/include/access/gistxlog.h
new file mode 100644
index 00000000000..3b126eca2ac
--- /dev/null
+++ b/src/include/access/gistxlog.h
@@ -0,0 +1,69 @@
+/*-------------------------------------------------------------------------
+ *
+ * gistxlog.h
+ *	  gist xlog routines
+ *
+ * Portions Copyright (c) 1996-2017, 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_NEW_ROOT			 0x20 */	/* not used anymore */
+#define XLOG_GIST_PAGE_SPLIT		0x30
+ /* #define XLOG_GIST_INSERT_COMPLETE	 0x40 */	/* not used anymore */
+#define XLOG_GIST_CREATE_INDEX		0x50
+ /* #define XLOG_GIST_PAGE_DELETE		 0x60 */	/* not used anymore */
+
+/*
+ * 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: 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;
+
+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