database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-25 13:17:41 +03:00
Code Activity

New WAL version - CRC and data blocks backup.

Browse Source
This commit is contained in:
Vadim B. Mikheev
2000-12-28 13:00:29 +00:00
parent c996c7f573
commit 7ceeeb662f
18 changed files with 1203 additions and 1202 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
src/include/access/xlog.h
View File

@@ -3,7 +3,7 @@
*
* PostgreSQL transaction log manager
*
* $Header: /cvsroot/pgsql/src/include/access/xlog.h,v 1.14 2000/12/18 00:44:48 tgl Exp $
* $Header: /cvsroot/pgsql/src/include/access/xlog.h,v 1.15 2000/12/28 13:00:25 vadim Exp $
*/
#ifndef XLOG_H
#define XLOG_H
@@ -13,12 +13,19 @@
#include "access/xlogdefs.h"
#include "access/xlogutils.h"
typedef struct crc64
{
uint32 crc1;
uint32 crc2;
} crc64;
typedef struct XLogRecord
{
crc64 xl_crc;
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 *data* on this page */
uint16 xl_len; /* total len of record *data* */
uint8 xl_info;
RmgrId xl_rmid; /* resource manager inserted this record */
@@ -33,25 +40,30 @@ typedef struct XLogRecord
((char*)record + SizeOfXLogRecord)
/*
* When there is no space on current page we continue on the next
* page with subrecord.
* 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;
uint16 xl_len; /* len of data left */
/* ACTUAL LOG DATA FOLLOWS AT END OF STRUCT */
} XLogSubRecord;
#define SizeOfXLogSubRecord DOUBLEALIGN(sizeof(XLogSubRecord))
#define SizeOfXLogSubRecord DOUBLEALIGN(sizeof(XLogSubRecord))
/*
* XLOG uses only low 4 bits of xl_info. High 4 bits may be used
* by rmgr...
* XLOG uses only low 4 bits of xl_info.
* High 4 bits may be used by rmgr...
*
* We support backup of 2 blocks per record only.
* If we backed up some of these blocks then we use
* flags below to signal rmgr about this on recovery.
*/
#define XLR_TO_BE_CONTINUED 0x01
#define XLR_SET_BKP_BLOCK(iblk) (0x08 >> iblk)
#define XLR_BKP_BLOCK_1 XLR_SET_BKP_BLOCK(0) /* 0x08 */
#define XLR_BKP_BLOCK_2 XLR_SET_BKP_BLOCK(1) /* 0x04 */
#define XLR_INFO_MASK 0x0F
/*
@@ -72,6 +84,7 @@ typedef struct XLogPageHeaderData
typedef XLogPageHeaderData *XLogPageHeader;
/* When record crosses page boundary */
#define XLP_FIRST_IS_SUBRECORD 0x0001
#define XLByteLT(left, right) \
@@ -100,9 +113,22 @@ typedef struct RmgrData
extern RmgrData RmgrTable[];
extern XLogRecPtr XLogInsert(RmgrId rmid, uint8 info,
char *hdr, uint32 hdrlen,
char *buf, uint32 buflen);
/*
* List of these structs is used to pass data to XLOG.
* If buffer is valid then XLOG will check if buffer must
* be backup-ed. For backup-ed buffer data will not be
* inserted into record (and XLOG sets
* XLR_BKP_BLOCK_X bit in xl_info).
*/
typedef struct XLogRecData
{
Buffer buffer; /* buffer associated with this data */
char *data;
uint32 len;
struct XLogRecData *next;
} XLogRecData;
extern XLogRecPtr XLogInsert(RmgrId rmid, uint8 info, XLogRecData *rdata);
extern void XLogFlush(XLogRecPtr RecPtr);
extern void CreateCheckPoint(bool shutdown);