mtr0log.cc File Reference

#include "mtr0log.h"
#include "buf0buf.h"
#include "dict0dict.h"
#include "log0recv.h"
#include "page0page.h"
#include "dict0boot.h"

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Functions
UNIV_INTERN void	mlog_catenate_string (mtr_t *mtr, const byte *str, ulint len)
UNIV_INTERN void	mlog_write_initial_log_record (const byte *ptr, byte type, mtr_t *mtr)
UNIV_INTERN byte *	mlog_parse_initial_log_record (byte *ptr, byte *end_ptr, byte *type, ulint *space, ulint *page_no)
UNIV_INTERN byte *	mlog_parse_nbytes (ulint type, byte *ptr, byte *end_ptr, byte *page, void *page_zip)
UNIV_INTERN void	mlog_write_ulint (byte *ptr, ulint val, byte type, mtr_t *mtr)
UNIV_INTERN void	mlog_write_ull (byte *ptr, ib_uint64_t val, mtr_t *mtr)
UNIV_INTERN void	mlog_write_string (byte *ptr, const byte *str, ulint len, mtr_t *mtr)
UNIV_INTERN void	mlog_log_string (byte *ptr, ulint len, mtr_t *mtr)
UNIV_INTERN byte *	mlog_parse_string (byte *ptr, byte *end_ptr, byte *page, void *page_zip)
UNIV_INTERN byte *	mlog_open_and_write_index (mtr_t *mtr, const byte *rec, const dict_index_t *index, byte type, ulint size)
UNIV_INTERN byte *	mlog_parse_index (byte *ptr, const byte *end_ptr, ibool comp, dict_index_t **index)

Detailed Description

Mini-transaction log routines

Created 12/7/1995 Heikki Tuuri

Definition in file mtr0log.cc.

Function Documentation

UNIV_INTERN void mlog_catenate_string	(	mtr_t *	mtr,
		const byte *	str,
		ulint	len
	)

Catenates n bytes to the mtr log.

Parameters

mtr	in: mtr
str	in: string to write
len	in: string length

Definition at line 44 of file mtr0log.cc.

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UNIV_INTERN void mlog_log_string	(	byte *	ptr,
		ulint	len,
		mtr_t *	mtr
	)

Logs a write of a string to a file page buffered in the buffer pool. Writes the corresponding log record to the mini-transaction log.

Parameters

ptr	in: pointer written to
len	in: string length
mtr	in: mini-transaction handle

Definition at line 346 of file mtr0log.cc.

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UNIV_INTERN byte* mlog_open_and_write_index	(	mtr_t *	mtr,
		const byte *	rec,
		const dict_index_t *	index,
		byte	type,
		ulint	size
	)

Opens a buffer for mlog, writes the initial log record and, if needed, the field lengths of an index.

Returns

buffer, NULL if log mode MTR_LOG_NONE

Parameters

mtr	in: mtr
rec	in: index record or page
index	in: record descriptor
type	in: log item type
size	in: requested buffer size in bytes (if 0, calls mlog_close() and returns NULL)

Definition at line 436 of file mtr0log.cc.

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UNIV_INTERN byte* mlog_parse_index	(	byte *	ptr,
		const byte *	end_ptr,
		ibool	comp,
		dict_index_t **	index
	)

Parses a log record written by mlog_open_and_write_index.

Returns

parsed record end, NULL if not a complete record

Parameters

ptr	in: buffer
end_ptr	in: buffer end
comp	in: TRUE=compact row format
index	out, own: dummy index

Definition at line 534 of file mtr0log.cc.

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UNIV_INTERN byte* mlog_parse_initial_log_record	(	byte *	ptr,
		byte *	end_ptr,
		byte *	type,
		ulint *	space,
		ulint *	page_no
	)

Parses an initial log record written by mlog_write_initial_log_record.

Returns

parsed record end, NULL if not a complete record

Parameters

ptr	in: buffer
end_ptr	in: buffer end
type	out: log record type: MLOG_1BYTE, ...
space	out: space id
page_no	out: page number

Definition at line 100 of file mtr0log.cc.

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UNIV_INTERN byte* mlog_parse_nbytes	(	ulint	type,
		byte *	ptr,
		byte *	end_ptr,
		byte *	page,
		void *	page_zip
	)

Parses a log record written by mlog_write_ulint or mlog_write_ull.

Returns

parsed record end, NULL if not a complete record or a corrupt record

Parameters

type	in: log record type: MLOG_1BYTE, ...
ptr	in: buffer
end_ptr	in: buffer end
page	in: page where to apply the log record, or NULL
page_zip	in/out: compressed page, or NULL

Definition at line 140 of file mtr0log.cc.

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UNIV_INTERN byte* mlog_parse_string	(	byte *	ptr,
		byte *	end_ptr,
		byte *	page,
		void *	page_zip
	)

Parses a log record written by mlog_write_string.

Returns

parsed record end, NULL if not a complete record

Parameters

ptr	in: buffer
end_ptr	in: buffer end
page	in: page where to apply the log record, or NULL
page_zip	in/out: compressed page, or NULL

Definition at line 384 of file mtr0log.cc.

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UNIV_INTERN void mlog_write_initial_log_record	(	const byte *	ptr,
		byte	type,
		mtr_t *	mtr
	)

Writes the initial part of a log record consisting of one-byte item type and four-byte space and page numbers. Also pushes info to the mtr memo that a buffer page has been modified.

Parameters

ptr	in: pointer to (inside) a buffer frame holding the file page where modification is made
type	in: log item type: MLOG_1BYTE, ...
mtr	in: mini-transaction handle

Definition at line 68 of file mtr0log.cc.

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UNIV_INTERN void mlog_write_string	(	byte *	ptr,
		const byte *	str,
		ulint	len,
		mtr_t *	mtr
	)

Writes a string to a file page buffered in the buffer pool. Writes the corresponding log record to the mini-transaction log.

Parameters

ptr	in: pointer where to write
str	in: string to write
len	in: string length
mtr	in: mini-transaction handle

Definition at line 326 of file mtr0log.cc.

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UNIV_INTERN void mlog_write_ulint	(	byte *	ptr,
		ulint	val,
		byte	type,
		mtr_t *	mtr
	)

Writes 1, 2 or 4 bytes to a file page. Writes the corresponding log record to the mini-transaction log if mtr is not NULL.

Parameters

ptr	in: pointer where to write
val	in: value to write
type	in: MLOG_1BYTE, MLOG_2BYTES, MLOG_4BYTES
mtr	in: mini-transaction handle

Definition at line 247 of file mtr0log.cc.

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UNIV_INTERN void mlog_write_ull	(	byte *	ptr,
		ib_uint64_t	val,
		mtr_t *	mtr
	)

Writes 8 bytes to a file page. Writes the corresponding log record to the mini-transaction log, only if mtr is not NULL

Parameters

ptr	in: pointer where to write
val	in: value to write
mtr	in: mini-transaction handle

Definition at line 293 of file mtr0log.cc.

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