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/*
* slru_io.h
*
* Copyright (c) 2025, PostgreSQL Global Development Group
* src/bin/pg_upgrade/slru_io.h
*/
#ifndef SLRU_IO_H
#define SLRU_IO_H
/*
* State for reading or writing an SLRU, with a one page buffer.
*/
typedef struct SlruSegState
{
bool writing;
bool long_segment_names;
char *dir;
char *fn;
int fd;
int64 segno;
uint64 pageno;
PGAlignedBlock buf;
} SlruSegState;
extern SlruSegState *AllocSlruRead(const char *dir, bool long_segment_names);
extern char *SlruReadSwitchPageSlow(SlruSegState *state, uint64 pageno);
extern void FreeSlruRead(SlruSegState *state);
static inline char *
SlruReadSwitchPage(SlruSegState *state, uint64 pageno)
{
if (state->segno != -1 && pageno == state->pageno)
return state->buf.data;
return SlruReadSwitchPageSlow(state, pageno);
}
extern SlruSegState *AllocSlruWrite(const char *dir, bool long_segment_names);
extern char *SlruWriteSwitchPageSlow(SlruSegState *state, uint64 pageno);
extern void FreeSlruWrite(SlruSegState *state);
static inline char *
SlruWriteSwitchPage(SlruSegState *state, uint64 pageno)
{
if (state->segno != -1 && pageno == state->pageno)
return state->buf.data;
return SlruWriteSwitchPageSlow(state, pageno);
}
#endif /* SLRU_IO_H */
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