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182 lines
5.9 KiB
C
182 lines
5.9 KiB
C
/******************************************************
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Mini-transaction logging routines
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(c) 1995 Innobase Oy
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Created 12/7/1995 Heikki Tuuri
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*******************************************************/
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#ifndef mtr0log_h
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#define mtr0log_h
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#include "univ.i"
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#include "mtr0mtr.h"
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/************************************************************
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Writes 1 - 4 bytes to a file page buffered in the buffer pool.
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Writes the corresponding log record to the mini-transaction log. */
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void
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mlog_write_ulint(
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/*=============*/
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byte* ptr, /* in: pointer where to write */
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ulint val, /* in: value to write */
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byte type, /* in: MLOG_1BYTE, MLOG_2BYTES, MLOG_4BYTES */
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mtr_t* mtr); /* in: mini-transaction handle */
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/************************************************************
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Writes 8 bytes to a file page buffered in the buffer pool.
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Writes the corresponding log record to the mini-transaction log. */
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void
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mlog_write_dulint(
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/*==============*/
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byte* ptr, /* in: pointer where to write */
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dulint val, /* in: value to write */
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byte type, /* in: MLOG_8BYTES */
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mtr_t* mtr); /* in: mini-transaction handle */
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/************************************************************
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Writes a string to a file page buffered in the buffer pool. Writes the
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corresponding log record to the mini-transaction log. */
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void
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mlog_write_string(
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/*==============*/
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byte* ptr, /* in: pointer where to write */
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byte* str, /* in: string to write */
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ulint len, /* in: string length */
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mtr_t* mtr); /* in: mini-transaction handle */
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/************************************************************
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Writes initial part of a log record consisting of one-byte item
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type and four-byte space and page numbers. */
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void
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mlog_write_initial_log_record(
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/*==========================*/
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byte* ptr, /* in: pointer to (inside) a buffer frame
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holding the file page where modification
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is made */
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byte type, /* in: log item type: MLOG_1BYTE, ... */
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mtr_t* mtr); /* in: mini-transaction handle */
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/************************************************************
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Writes a log record about an .ibd file create/delete/rename. */
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UNIV_INLINE
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byte*
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mlog_write_initial_log_record_for_file_op(
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/*======================================*/
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/* out: new value of log_ptr */
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ulint type, /* in: MLOG_FILE_CREATE, MLOG_FILE_DELETE, or
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MLOG_FILE_RENAME */
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ulint space_id,/* in: space id, if applicable */
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ulint page_no,/* in: page number (not relevant currently) */
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byte* log_ptr,/* in: pointer to mtr log which has been opened */
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mtr_t* mtr); /* in: mtr */
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/************************************************************
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Catenates 1 - 4 bytes to the mtr log. */
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UNIV_INLINE
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void
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mlog_catenate_ulint(
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/*================*/
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mtr_t* mtr, /* in: mtr */
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ulint val, /* in: value to write */
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ulint type); /* in: MLOG_1BYTE, MLOG_2BYTES, MLOG_4BYTES */
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/************************************************************
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Catenates n bytes to the mtr log. */
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void
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mlog_catenate_string(
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/*=================*/
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mtr_t* mtr, /* in: mtr */
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byte* str, /* in: string to write */
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ulint len); /* in: string length */
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/************************************************************
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Catenates a compressed ulint to mlog. */
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UNIV_INLINE
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void
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mlog_catenate_ulint_compressed(
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/*===========================*/
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mtr_t* mtr, /* in: mtr */
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ulint val); /* in: value to write */
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/************************************************************
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Catenates a compressed dulint to mlog. */
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UNIV_INLINE
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void
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mlog_catenate_dulint_compressed(
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/*============================*/
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mtr_t* mtr, /* in: mtr */
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dulint val); /* in: value to write */
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/************************************************************
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Opens a buffer to mlog. It must be closed with mlog_close. */
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UNIV_INLINE
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byte*
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mlog_open(
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/*======*/
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/* out: buffer, NULL if log mode MTR_LOG_NONE */
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mtr_t* mtr, /* in: mtr */
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ulint size); /* in: buffer size in bytes */
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/************************************************************
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Closes a buffer opened to mlog. */
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UNIV_INLINE
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void
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mlog_close(
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/*=======*/
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mtr_t* mtr, /* in: mtr */
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byte* ptr); /* in: buffer space from ptr up was not used */
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/************************************************************
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Writes the initial part of a log record. */
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UNIV_INLINE
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byte*
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mlog_write_initial_log_record_fast(
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/*===============================*/
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/* out: new value of log_ptr */
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byte* ptr, /* in: pointer to (inside) a buffer frame holding the
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file page where modification is made */
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byte type, /* in: log item type: MLOG_1BYTE, ... */
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byte* log_ptr,/* in: pointer to mtr log which has been opened */
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mtr_t* mtr); /* in: mtr */
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/************************************************************
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Parses an initial log record written by mlog_write_initial_log_record. */
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byte*
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mlog_parse_initial_log_record(
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/*==========================*/
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/* out: parsed record end, NULL if not a complete
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record */
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byte* ptr, /* in: buffer */
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byte* end_ptr,/* in: buffer end */
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byte* type, /* out: log record type: MLOG_1BYTE, ... */
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ulint* space, /* out: space id */
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ulint* page_no);/* out: page number */
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/************************************************************
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Parses a log record written by mlog_write_ulint or mlog_write_dulint. */
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byte*
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mlog_parse_nbytes(
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/*==============*/
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/* out: parsed record end, NULL if not a complete
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record */
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ulint type, /* in: log record type: MLOG_1BYTE, ... */
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byte* ptr, /* in: buffer */
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byte* end_ptr,/* in: buffer end */
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byte* page); /* in: page where to apply the log record, or NULL */
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/************************************************************
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Parses a log record written by mlog_write_string. */
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byte*
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mlog_parse_string(
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/*==============*/
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/* out: parsed record end, NULL if not a complete
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record */
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byte* ptr, /* in: buffer */
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byte* end_ptr,/* in: buffer end */
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byte* page); /* in: page where to apply the log record, or NULL */
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/* Insert, update, and maybe other functions may use this value to define an
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extra mlog buffer size for variable size data */
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#define MLOG_BUF_MARGIN 256
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#ifndef UNIV_NONINL
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#include "mtr0log.ic"
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#endif
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#endif
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