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Widen xl_len field of XLogRecord header to 32 bits, so that we'll have

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a more tolerable limit on the number of subtransactions or deleted files
in COMMIT and ABORT records.  Buy back the extra space by eliminating the
xl_xact_prev field, which isn't being used for anything and is rather
unlikely ever to be used for anything.
This does not force initdb, but you do need to do pg_resetxlog if you
want to upgrade an existing 8.0 installation without initdb.
This commit is contained in:
Tom Lane
2004-08-29 16:34:48 +00:00
parent b6b71b85bc
commit 0ffe11abd3
4 changed files with 68 additions and 71 deletions
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8
src/include/access/xlog.h
View File

@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.57 2004/08/29 05:06:55 momjian Exp $
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.58 2004/08/29 16:34:48 tgl Exp $
*/
#ifndef XLOG_H
#define XLOG_H
@@ -35,18 +35,18 @@ typedef struct XLogRecord
{
crc64 xl_crc; /* CRC for this record */
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; /* total len of rmgr data */
uint32 xl_len; /* total len of rmgr data */
uint8 xl_info; /* flag bits, see below */
RmgrId xl_rmid; /* resource manager for this record */
/* Depending on MAXALIGN, there are either 2 or 6 wasted bytes here */
/* ACTUAL LOG DATA FOLLOWS AT END OF STRUCT */
} XLogRecord;
#define SizeOfXLogRecord MAXALIGN(sizeof(XLogRecord))
#define MAXLOGRECSZ 65535 /* the most that'll fit in xl_len */
#define XLogRecGetData(record) ((char*) (record) + SizeOfXLogRecord)

11
src/include/access/xlog_internal.h
View File

@@ -11,7 +11,7 @@
* Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xlog_internal.h,v 1.4 2004/08/29 05:06:55 momjian Exp $
* $PostgreSQL: pgsql/src/include/access/xlog_internal.h,v 1.5 2004/08/29 16:34:48 tgl Exp $
*/
#ifndef XLOG_INTERNAL_H
#define XLOG_INTERNAL_H
@@ -58,7 +58,7 @@ typedef struct XLogContRecord
/*
* Each page of XLOG file has a header like this:
*/
#define XLOG_PAGE_MAGIC 0xD05B /* can be used as WAL version indicator */
#define XLOG_PAGE_MAGIC 0xD05C /* can be used as WAL version indicator */
typedef struct XLogPageHeaderData
{
@@ -203,13 +203,6 @@ typedef XLogLongPageHeaderData *XLogLongPageHeader;
extern char XLogDir[MAXPGPATH];
/*
* _INTL_MAXLOGRECSZ: max space needed for a record including header and
* any backup-block data.
*/
#define _INTL_MAXLOGRECSZ (SizeOfXLogRecord + MAXLOGRECSZ + \
XLR_MAX_BKP_BLOCKS * (sizeof(BkpBlock) + BLCKSZ))
/*
* Method table for resource managers.