64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* toast_internals.h
|
|
* Internal definitions for the TOAST system.
|
|
*
|
|
* Copyright (c) 2000-2023, PostgreSQL Global Development Group
|
|
*
|
|
* src/include/access/toast_internals.h
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#ifndef TOAST_INTERNALS_H
|
|
#define TOAST_INTERNALS_H
|
|
|
|
#include "access/toast_compression.h"
|
|
#include "storage/lockdefs.h"
|
|
#include "utils/relcache.h"
|
|
#include "utils/snapshot.h"
|
|
|
|
/*
|
|
* The information at the start of the compressed toast data.
|
|
*/
|
|
typedef struct toast_compress_header
|
|
{
|
|
int32 vl_len_; /* varlena header (do not touch directly!) */
|
|
uint32 tcinfo; /* 2 bits for compression method and 30 bits
|
|
* external size; see va_extinfo */
|
|
} toast_compress_header;
|
|
|
|
/*
|
|
* Utilities for manipulation of header information for compressed
|
|
* toast entries.
|
|
*/
|
|
#define TOAST_COMPRESS_EXTSIZE(ptr) \
|
|
(((toast_compress_header *) (ptr))->tcinfo & VARLENA_EXTSIZE_MASK)
|
|
#define TOAST_COMPRESS_METHOD(ptr) \
|
|
(((toast_compress_header *) (ptr))->tcinfo >> VARLENA_EXTSIZE_BITS)
|
|
|
|
#define TOAST_COMPRESS_SET_SIZE_AND_COMPRESS_METHOD(ptr, len, cm_method) \
|
|
do { \
|
|
Assert((len) > 0 && (len) <= VARLENA_EXTSIZE_MASK); \
|
|
Assert((cm_method) == TOAST_PGLZ_COMPRESSION_ID || \
|
|
(cm_method) == TOAST_LZ4_COMPRESSION_ID); \
|
|
((toast_compress_header *) (ptr))->tcinfo = \
|
|
(len) | ((uint32) (cm_method) << VARLENA_EXTSIZE_BITS); \
|
|
} while (0)
|
|
|
|
extern Datum toast_compress_datum(Datum value, char cmethod);
|
|
extern Oid toast_get_valid_index(Oid toastoid, LOCKMODE lock);
|
|
|
|
extern void toast_delete_datum(Relation rel, Datum value, bool is_speculative);
|
|
extern Datum toast_save_datum(Relation rel, Datum value,
|
|
struct varlena *oldexternal, int options);
|
|
|
|
extern int toast_open_indexes(Relation toastrel,
|
|
LOCKMODE lock,
|
|
Relation **toastidxs,
|
|
int *num_indexes);
|
|
extern void toast_close_indexes(Relation *toastidxs, int num_indexes,
|
|
LOCKMODE lock);
|
|
extern void init_toast_snapshot(Snapshot toast_snapshot);
|
|
|
|
#endif /* TOAST_INTERNALS_H */
|