buf0checksum.cc File Reference

#include "univ.i"
#include "fil0fil.h"
#include "ut0crc32.h"
#include "ut0rnd.h"
#include "srv0srv.h"
#include "buf0types.h"

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Functions
UNIV_INTERN ib_uint32_t	buf_calc_page_crc32 (const byte *page)
UNIV_INTERN ulint	buf_calc_page_new_checksum (const byte *page)
UNIV_INTERN ulint	buf_calc_page_old_checksum (const byte *page)
UNIV_INTERN const char *	buf_checksum_algorithm_name (srv_checksum_algorithm_t algo)

Variables
UNIV_INTERN ulong	srv_checksum_algorithm = SRV_CHECKSUM_ALGORITHM_INNODB

Detailed Description

Buffer pool checksum functions, also linked from /extra/innochecksum.cc

Created Aug 11, 2011 Vasil Dimov

Definition in file buf0checksum.cc.

Function Documentation

UNIV_INTERN ib_uint32_t buf_calc_page_crc32

(

const byte *

page

)

Calculates a page CRC32 which is stored to the page when it is written to a file. Note that we must be careful to calculate the same value on 32-bit and 64-bit architectures.

Returns

checksum

Parameters

page	in: buffer page

Definition at line 51 of file buf0checksum.cc.

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UNIV_INTERN ulint buf_calc_page_new_checksum

(

const byte *

page

)

Calculates a page checksum which is stored to the page when it is written to a file. Note that we must be careful to calculate the same value on 32-bit and 64-bit architectures.

Returns

checksum

Parameters

page	in: buffer page

Definition at line 81 of file buf0checksum.cc.

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UNIV_INTERN ulint buf_calc_page_old_checksum

(

const byte *

page

)

In versions < 4.0.14 and < 4.1.1 there was a bug that the checksum only looked at the first few bytes of the page. This calculates that old checksum. NOTE: we must first store the new formula checksum to FIL_PAGE_SPACE_OR_CHKSUM before calculating and storing this old checksum because this takes that field as an input!

Returns

checksum

Parameters

page	in: buffer page

Definition at line 115 of file buf0checksum.cc.

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UNIV_INTERN const char* buf_checksum_algorithm_name

(

srv_checksum_algorithm_t

algo

)

Return a printable string describing the checksum algorithm.

Returns

algorithm name

Parameters

algo	in: algorithm

Definition at line 135 of file buf0checksum.cc.

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Variable Documentation

UNIV_INTERN ulong srv_checksum_algorithm = SRV_CHECKSUM_ALGORITHM_INNODB

the macro MYSQL_SYSVAR_ENUM() requires "long unsigned int" and if we

use srv_checksum_algorithm_t here then we get a compiler error: ha_innodb.cc:12251: error: cannot convert 'srv_checksum_algorithm_t*' to 'long unsigned int*' in initialization

Definition at line 40 of file buf0checksum.cc.