multixact_read_v18.h

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/*
 * multixact_read_v18.h
 *
 * Copyright (c) 2025-2026, PostgreSQL Global Development Group
 * src/bin/pg_upgrade/multixact_read_v18.h
 */
#ifndef MULTIXACT_READ_V18_H
#define MULTIXACT_READ_V18_H
 
#include "access/multixact.h"
#include "slru_io.h"
 
/*
 * MultiXactOffset changed from uint32 to uint64 between versions 18 and 19.
 * MultiXactOffset32 is used to represent a 32-bit offset from the old
 * cluster.
 */
typedef uint32 MultiXactOffset32;
 
typedef struct OldMultiXactReader
{
    MultiXactId nextMXact;
    MultiXactOffset32 nextOffset;
 
    SlruSegState *offset;
    SlruSegState *members;
} OldMultiXactReader;
 
extern OldMultiXactReader *AllocOldMultiXactRead(char *pgdata,
                                                 MultiXactId nextMulti,
                                                 MultiXactOffset32 nextOffset);
extern bool GetOldMultiXactIdSingleMember(OldMultiXactReader *state,
                                          MultiXactId multi,
                                          MultiXactMember *member);
extern void FreeOldMultiXactReader(OldMultiXactReader *reader);
 
#endif                          /* MULTIXACT_READ_V18_H */