Transaction log manager core code.

It doesn't work currently but also don't break anything -:)

src/include/access/rmgr.h

@@ -0,0 +1,34 @@
+/*
+ *
+ * rmgr.h
+ *
+ * Resource managers description table
+ *
+ */
+#ifndef RMGR_H
+#define RMGR_H
+
+typedef uint8	RmgrId;
+
+typedef struct RmgrData
+{
+	char	   *rm_name;
+	char	   *(*rm_redo) ();	/* REDO(XLogRecPtr rptr) */
+	char	   *(*rm_undo) ();	/* UNDO(XLogRecPtr rptr) */
+} RmgrData;
+
+extern RmgrData	   *RmgrTable;
+
+/*
+ * Built-in resource managers
+ */
+#define	RM_XLOG_ID				0
+#define	RM_XACT_ID				1
+#define	RM_HEAP_ID				2
+#define	RM_BTREE_ID				3
+#define	RM_HASH_ID				4
+#define	RM_RTREE_ID				5
+#define	RM_GIST_ID				6
+#define	RM_MAX_ID				RM_GIST_ID
+
+#endif	 /* RMGR_H */

src/include/access/xlog.h

@@ -0,0 +1,70 @@
+/*
+ *
+ * xlog.h
+ *
+ * Postgres transaction log manager
+ *
+ */
+#ifndef XLOG_H
+#define XLOG_H
+
+#include "access/rmgr.h"
+#include "access/transam.h"
+
+typedef struct XLogRecPtr
+{
+	uint32		xlogid;		/* log file #, 0 based */
+	uint32		xrecoff;	/* offset of record in log file */
+} XLogRecPtr;
+
+typedef struct XLogRecord
+{
+	XLogRecPtr		xl_prev;		/* ptr to previous record in log */
+	XLogRecPtr		xl_xact_prev;	/* ptr to previous record of this xact */
+	TransactionId	xl_xid;			/* xact id */
+	uint16			xl_len;			/* len of record on this page */
+	uint8			xl_info;
+	RmgrId			xl_rmid;		/* resource manager inserted this record */
+
+	/* ACTUAL LOG DATA FOLLOWS AT END OF STRUCT */
+
+} XLogRecord;
+
+#define	SizeOfXLogRecord	DOUBLEALIGN(sizeof(XLogRecord))
+#define	MAXLOGRECSZ			(2 * BLCKSZ)
+/*
+ * When there is no space on current page we continue on the next
+ * page with subrecord.
+ */
+typedef struct XLogSubRecord
+{
+	uint16			xl_len;
+	uint8			xl_info;
+
+	/* ACTUAL LOG DATA FOLLOWS AT END OF STRUCT */
+
+} XLogSubRecord;
+
+#define	SizeOfXLogSubRecord	DOUBLEALIGN(sizeof(XLogSubRecord))
+
+#define	XLR_TO_BE_CONTINUED		0x01
+
+#define	XLOG_PAGE_MAGIC	0x17345168
+
+typedef struct XLogPageHeaderData
+{
+	uint32		xlp_magic;
+	uint16		xlp_info;
+} XLogPageHeaderData;
+
+#define	SizeOfXLogPHD	DOUBLEALIGN(sizeof(XLogPageHeaderData))
+
+typedef XLogPageHeaderData *XLogPageHeader;
+
+#define	XLP_FIRST_IS_SUBRECORD	0x0001
+
+extern XLogRecPtr		XLogInsert(RmgrId rmid, char *hdr, uint32 hdrlen, 
+									char *buf, uint32 buflen);
+extern void				XLogFlush(XLogRecPtr RecPtr);
+
+#endif	/* XLOG_H */