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/******************************************************
Mini-transaction logging routines
(c) 1995 Innobase Oy
Created 12/7/1995 Heikki Tuuri
*******************************************************/
#ifndef mtr0log_h
#define mtr0log_h
#include "univ.i"
#include "mtr0mtr.h"
/************************************************************
Writes 1 - 4 bytes to a file page buffered in the buffer pool.
Writes the corresponding log record to the mini-transaction log. */
void
mlog_write_ulint(
/*=============*/
byte* ptr, /* in: pointer where to write */
ulint val, /* in: value to write */
byte type, /* in: MLOG_1BYTE, MLOG_2BYTES, MLOG_4BYTES */
mtr_t* mtr); /* in: mini-transaction handle */
/************************************************************
Writes 8 bytes to a file page buffered in the buffer pool.
Writes the corresponding log record to the mini-transaction log. */
void
mlog_write_dulint(
/*==============*/
byte* ptr, /* in: pointer where to write */
dulint val, /* in: value to write */
mtr_t* mtr); /* in: mini-transaction handle */
/************************************************************
Writes a string to a file page buffered in the buffer pool. Writes the
corresponding log record to the mini-transaction log. */
void
mlog_write_string(
/*==============*/
byte* ptr, /* in: pointer where to write */
byte* str, /* in: string to write */
ulint len, /* in: string length */
mtr_t* mtr); /* in: mini-transaction handle */
/************************************************************
Writes initial part of a log record consisting of one-byte item
type and four-byte space and page numbers. */
void
mlog_write_initial_log_record(
/*==========================*/
byte* ptr, /* in: pointer to (inside) a buffer frame
holding the file page where modification
is made */
byte type, /* in: log item type: MLOG_1BYTE, ... */
mtr_t* mtr); /* in: mini-transaction handle */
/************************************************************
Writes a log record about an .ibd file create/delete/rename. */
UNIV_INLINE
byte*
mlog_write_initial_log_record_for_file_op(
/*======================================*/
/* out: new value of log_ptr */
ulint type, /* in: MLOG_FILE_CREATE, MLOG_FILE_DELETE, or
MLOG_FILE_RENAME */
ulint space_id,/* in: space id, if applicable */
ulint page_no,/* in: page number (not relevant currently) */
byte* log_ptr,/* in: pointer to mtr log which has been opened */
mtr_t* mtr); /* in: mtr */
/************************************************************
Catenates 1 - 4 bytes to the mtr log. */
UNIV_INLINE
void
mlog_catenate_ulint(
/*================*/
mtr_t* mtr, /* in: mtr */
ulint val, /* in: value to write */
ulint type); /* in: MLOG_1BYTE, MLOG_2BYTES, MLOG_4BYTES */
/************************************************************
Catenates n bytes to the mtr log. */
void
mlog_catenate_string(
/*=================*/
mtr_t* mtr, /* in: mtr */
byte* str, /* in: string to write */
ulint len); /* in: string length */
/************************************************************
Catenates a compressed ulint to mlog. */
UNIV_INLINE
void
mlog_catenate_ulint_compressed(
/*===========================*/
mtr_t* mtr, /* in: mtr */
ulint val); /* in: value to write */
/************************************************************
Catenates a compressed dulint to mlog. */
UNIV_INLINE
void
mlog_catenate_dulint_compressed(
/*============================*/
mtr_t* mtr, /* in: mtr */
dulint val); /* in: value to write */
/************************************************************
Opens a buffer to mlog. It must be closed with mlog_close. */
UNIV_INLINE
byte*
mlog_open(
/*======*/
/* out: buffer, NULL if log mode MTR_LOG_NONE */
mtr_t* mtr, /* in: mtr */
ulint size); /* in: buffer size in bytes */
/************************************************************
Closes a buffer opened to mlog. */
UNIV_INLINE
void
mlog_close(
/*=======*/
mtr_t* mtr, /* in: mtr */
byte* ptr); /* in: buffer space from ptr up was not used */
/************************************************************
Writes the initial part of a log record. */
UNIV_INLINE
byte*
mlog_write_initial_log_record_fast(
/*===============================*/
/* out: new value of log_ptr */
byte* ptr, /* in: pointer to (inside) a buffer frame holding the
file page where modification is made */
byte type, /* in: log item type: MLOG_1BYTE, ... */
byte* log_ptr,/* in: pointer to mtr log which has been opened */
mtr_t* mtr); /* in: mtr */
/************************************************************
Parses an initial log record written by mlog_write_initial_log_record. */
byte*
mlog_parse_initial_log_record(
/*==========================*/
/* out: parsed record end, NULL if not a complete
record */
byte* ptr, /* in: buffer */
byte* end_ptr,/* in: buffer end */
byte* type, /* out: log record type: MLOG_1BYTE, ... */
ulint* space, /* out: space id */
ulint* page_no);/* out: page number */
/************************************************************
Parses a log record written by mlog_write_ulint or mlog_write_dulint. */
byte*
mlog_parse_nbytes(
/*==============*/
/* out: parsed record end, NULL if not a complete
record */
ulint type, /* in: log record type: MLOG_1BYTE, ... */
byte* ptr, /* in: buffer */
byte* end_ptr,/* in: buffer end */
byte* page); /* in: page where to apply the log record, or NULL */
/************************************************************
Parses a log record written by mlog_write_string. */
byte*
mlog_parse_string(
/*==============*/
/* out: parsed record end, NULL if not a complete
record */
byte* ptr, /* in: buffer */
byte* end_ptr,/* in: buffer end */
byte* page); /* in: page where to apply the log record, or NULL */
/* Insert, update, and maybe other functions may use this value to define an
extra mlog buffer size for variable size data */
#define MLOG_BUF_MARGIN 256
#ifndef UNIV_NONINL
#include "mtr0log.ic"
#endif
#endif
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