116 lines
3.5 KiB
C
116 lines
3.5 KiB
C
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/*-------------------------------------------------------------------------
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*
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* pg_control.h
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* The system control file "pg_control" is not a heap relation.
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* However, we define it here so that the format is documented.
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*
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*
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: pg_control.h,v 1.1 2001/03/13 01:17:06 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PG_CONTROL_H
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#define PG_CONTROL_H
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#include <time.h>
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#include "access/xlogdefs.h"
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#include "utils/pg_crc.h"
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/* Version identifier for this pg_control format */
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#define PG_CONTROL_VERSION 71
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/*
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* Body of CheckPoint XLOG records. This is declared here because we keep
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* a copy of the latest one in pg_control for possible disaster recovery.
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*/
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typedef struct CheckPoint
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{
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XLogRecPtr redo; /* next RecPtr available when we */
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/* began to create CheckPoint */
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/* (i.e. REDO start point) */
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XLogRecPtr undo; /* first record of oldest in-progress */
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/* transaction when we started */
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/* (i.e. UNDO end point) */
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StartUpID ThisStartUpID; /* current SUI */
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TransactionId nextXid; /* next free XID */
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Oid nextOid; /* next free OID */
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time_t time; /* time stamp of checkpoint */
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} CheckPoint;
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/* XLOG info values for XLOG rmgr */
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#define XLOG_CHECKPOINT_SHUTDOWN 0x00
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#define XLOG_CHECKPOINT_ONLINE 0x10
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#define XLOG_NEXTXID 0x20
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#define XLOG_NEXTOID 0x30
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/* System status indicator */
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typedef enum DBState
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{
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DB_STARTUP = 0,
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DB_SHUTDOWNED,
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DB_SHUTDOWNING,
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DB_IN_RECOVERY,
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DB_IN_PRODUCTION
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} DBState;
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#define LOCALE_NAME_BUFLEN 128
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/*
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* Contents of pg_control.
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*
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* NOTE: try to keep this under 512 bytes so that it will fit on one physical
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* sector of typical disk drives. This reduces the odds of corruption due to
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* power failure midway through a write. Currently it fits comfortably,
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* but we could probably reduce LOCALE_NAME_BUFLEN if things get tight.
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*/
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typedef struct ControlFileData
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{
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crc64 crc; /* CRC for remainder of struct */
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/*
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* Version identifier information. Keep these fields at the front,
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* especially pg_control_version; they won't be real useful if they
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* move around.
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*
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* pg_control_version identifies the format of pg_control itself.
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* catalog_version_no identifies the format of the system catalogs.
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*
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* There are additional version identifiers in individual files;
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* for example, WAL logs contain per-page magic numbers that can serve
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* as version cues for the WAL log.
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*/
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uint32 pg_control_version; /* PG_CONTROL_VERSION */
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uint32 catalog_version_no; /* see catversion.h */
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/*
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* System status data
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*/
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DBState state; /* see enum above */
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time_t time; /* time stamp of last pg_control update */
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uint32 logId; /* current log file id */
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uint32 logSeg; /* current log file segment, + 1 */
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XLogRecPtr checkPoint; /* last check point record ptr */
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XLogRecPtr prevCheckPoint; /* previous check point record ptr */
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CheckPoint checkPointCopy; /* copy of last check point record */
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/*
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* This data is used to make sure that configuration of this database
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* is compatible with the backend executable.
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*/
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uint32 blcksz; /* block size for this DB */
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uint32 relseg_size; /* blocks per segment of large relation */
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/* active locales --- "C" if compiled without USE_LOCALE: */
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char lc_collate[LOCALE_NAME_BUFLEN];
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char lc_ctype[LOCALE_NAME_BUFLEN];
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} ControlFileData;
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#endif /* PG_CONTROL_H */
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