xloginsert.h

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/*
 * xloginsert.h
 *
 * Functions for generating WAL records
 *
 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/access/xloginsert.h
 */
#ifndef XLOGINSERT_H
#define XLOGINSERT_H
 
#include "access/rmgr.h"
#include "access/xlogdefs.h"
#include "storage/block.h"
#include "storage/buf.h"
#include "storage/bufpage.h"
#include "storage/relfilelocator.h"
#include "utils/relcache.h"
 
/*
 * The minimum size of the WAL construction working area. If you need to
 * register more than XLR_NORMAL_MAX_BLOCK_ID block references or have more
 * than XLR_NORMAL_RDATAS data chunks in a single WAL record, you must call
 * XLogEnsureRecordSpace() first to allocate more working memory.
 */
#define XLR_NORMAL_MAX_BLOCK_ID     4
#define XLR_NORMAL_RDATAS           20
 
/* flags for XLogRegisterBuffer */
#define REGBUF_FORCE_IMAGE  0x01    /* force a full-page image */
#define REGBUF_NO_IMAGE     0x02    /* don't take a full-page image */
#define REGBUF_WILL_INIT    (0x04 | 0x02)   /* page will be re-initialized at
                                             * replay (implies NO_IMAGE) */
#define REGBUF_STANDARD     0x08    /* page follows "standard" page layout,
                                     * (data between pd_lower and pd_upper
                                     * will be skipped) */
#define REGBUF_KEEP_DATA    0x10    /* include data even if a full-page image
                                     * is taken */
#define REGBUF_NO_CHANGE    0x20    /* intentionally register clean buffer */
 
/* prototypes for public functions in xloginsert.c: */
extern void XLogBeginInsert(void);
extern void XLogSetRecordFlags(uint8 flags);
extern XLogRecPtr XLogInsert(RmgrId rmid, uint8 info);
extern void XLogEnsureRecordSpace(int max_block_id, int ndatas);
extern void XLogRegisterData(const void *data, uint32 len);
extern void XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags);
extern void XLogRegisterBlock(uint8 block_id, RelFileLocator *rlocator,
                              ForkNumber forknum, BlockNumber blknum, const PageData *page,
                              uint8 flags);
extern void XLogRegisterBufData(uint8 block_id, const void *data, uint32 len);
extern void XLogResetInsertion(void);
extern bool XLogCheckBufferNeedsBackup(Buffer buffer);
 
extern XLogRecPtr log_newpage(RelFileLocator *rlocator, ForkNumber forknum,
                              BlockNumber blkno, Page page, bool page_std);
extern void log_newpages(RelFileLocator *rlocator, ForkNumber forknum, int num_pages,
                         BlockNumber *blknos, Page *pages, bool page_std);
extern XLogRecPtr log_newpage_buffer(Buffer buffer, bool page_std);
extern void log_newpage_range(Relation rel, ForkNumber forknum,
                              BlockNumber startblk, BlockNumber endblk, bool page_std);
extern XLogRecPtr XLogSaveBufferForHint(Buffer buffer, bool buffer_std);
 
extern void InitXLogInsert(void);
 
#endif                          /* XLOGINSERT_H */