1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
/*****************************************************************************
Copyright (c) 1995, 2011, Oracle and/or its affiliates. All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file buf/buf0checksum.cc
Buffer pool checksum functions, also linked from /extra/innochecksum.cc
Created Aug 11, 2011 Vasil Dimov
*******************************************************/
#include "univ.i"
#include "fil0fil.h" /* FIL_* */
#include "ut0crc32.h" /* ut_crc32() */
#include "ut0rnd.h" /* ut_fold_binary() */
#ifndef UNIV_INNOCHECKSUM
#include "srv0srv.h" /* SRV_CHECKSUM_* */
#include "buf0types.h"
/** 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 */
UNIV_INTERN ulong srv_checksum_algorithm = SRV_CHECKSUM_ALGORITHM_INNODB;
#endif /* !UNIV_INNOCHECKSUM */
/********************************************************************//**
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.
@return checksum */
UNIV_INTERN
ib_uint32_t
buf_calc_page_crc32(
/*================*/
const byte* page) /*!< in: buffer page */
{
ib_uint32_t checksum;
/* Since the field FIL_PAGE_FILE_FLUSH_LSN, and in versions <= 4.1.x
FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID, are written outside the buffer pool
to the first pages of data files, we have to skip them in the page
checksum calculation.
We must also skip the field FIL_PAGE_SPACE_OR_CHKSUM where the
checksum is stored, and also the last 8 bytes of page because
there we store the old formula checksum. */
checksum = ut_crc32(page + FIL_PAGE_OFFSET,
FIL_PAGE_FILE_FLUSH_LSN - FIL_PAGE_OFFSET)
^ ut_crc32(page + FIL_PAGE_DATA,
UNIV_PAGE_SIZE - FIL_PAGE_DATA
- FIL_PAGE_END_LSN_OLD_CHKSUM);
return(checksum);
}
/********************************************************************//**
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.
@return checksum */
UNIV_INTERN
ulint
buf_calc_page_new_checksum(
/*=======================*/
const byte* page) /*!< in: buffer page */
{
ulint checksum;
/* Since the field FIL_PAGE_FILE_FLUSH_LSN, and in versions <= 4.1.x
FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID, are written outside the buffer pool
to the first pages of data files, we have to skip them in the page
checksum calculation.
We must also skip the field FIL_PAGE_SPACE_OR_CHKSUM where the
checksum is stored, and also the last 8 bytes of page because
there we store the old formula checksum. */
checksum = ut_fold_binary(page + FIL_PAGE_OFFSET,
FIL_PAGE_FILE_FLUSH_LSN - FIL_PAGE_OFFSET)
+ ut_fold_binary(page + FIL_PAGE_DATA,
UNIV_PAGE_SIZE - FIL_PAGE_DATA
- FIL_PAGE_END_LSN_OLD_CHKSUM);
checksum = checksum & 0xFFFFFFFFUL;
return(checksum);
}
/********************************************************************//**
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!
@return checksum */
UNIV_INTERN
ulint
buf_calc_page_old_checksum(
/*=======================*/
const byte* page) /*!< in: buffer page */
{
ulint checksum;
checksum = ut_fold_binary(page, FIL_PAGE_FILE_FLUSH_LSN);
checksum = checksum & 0xFFFFFFFFUL;
return(checksum);
}
#ifndef UNIV_INNOCHECKSUM
/********************************************************************//**
Return a printable string describing the checksum algorithm.
@return algorithm name */
UNIV_INTERN
const char*
buf_checksum_algorithm_name(
/*========================*/
srv_checksum_algorithm_t algo) /*!< in: algorithm */
{
switch (algo) {
case SRV_CHECKSUM_ALGORITHM_CRC32:
case SRV_CHECKSUM_ALGORITHM_STRICT_CRC32:
return("crc32");
case SRV_CHECKSUM_ALGORITHM_INNODB:
case SRV_CHECKSUM_ALGORITHM_STRICT_INNODB:
return("innodb");
case SRV_CHECKSUM_ALGORITHM_NONE:
case SRV_CHECKSUM_ALGORITHM_STRICT_NONE:
return("none");
}
ut_error;
return(NULL);
}
#endif /* !UNIV_INNOCHECKSUM */
|
