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/*
* multixact_read_v18.h
*
* Copyright (c) 2025, 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 */
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