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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/******************************************************
Percona XtraBackup: hot backup tool for InnoDB
(c) 2009-2014 Percona LLC and/or its affiliates
Originally Created 3/3/2009 Yasufumi Kinoshita
Written by Alexey Kopytov, Aleksandr Kuzminsky, Stewart Smith, Vadim Tkachenko,
Yasufumi Kinoshita, Ignacio Nin and Baron Schwartz.
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, Fifth Floor, Boston, MA 02110-1301, USA
*******************************************************
This file incorporates work covered by the following copyright and
permission notice:
Copyright 2010 Codership Oy <http://www.codership.com>
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, Fifth Floor, Boston, MA 02110-1301, USA
*******************************************************/
#include <my_global.h>
#include <my_base.h>
#include <handler.h>
#include <trx0sys.h>
#include "common.h"
#ifdef WITH_WSREP
#define WSREP_XID_PREFIX "WSREPXid"
#define WSREP_XID_PREFIX_LEN MYSQL_XID_PREFIX_LEN
#define WSREP_XID_UUID_OFFSET 8
#define WSREP_XID_SEQNO_OFFSET (WSREP_XID_UUID_OFFSET + sizeof(wsrep_uuid_t))
#define WSREP_XID_GTRID_LEN (WSREP_XID_SEQNO_OFFSET + sizeof(wsrep_seqno_t))
/*! undefined seqno */
#define WSREP_SEQNO_UNDEFINED (-1)
/*! Name of file where Galera info is stored on recovery */
#define XB_GALERA_INFO_FILENAME "xtrabackup_galera_info"
/* Galera UUID type - for all unique IDs */
typedef struct wsrep_uuid {
unsigned char data[16];
} wsrep_uuid_t;
/* sequence number of a writeset, etc. */
typedef long long wsrep_seqno_t;
/* Undefined UUID */
static const wsrep_uuid_t WSREP_UUID_UNDEFINED = {{0,}};
/***********************************************************************//**
Check if a given WSREP XID is valid.
@return true if valid.
*/
static
bool
wsrep_is_wsrep_xid(
/*===============*/
const void* xid_ptr)
{
const XID* xid = reinterpret_cast<const XID*>(xid_ptr);
return((xid->formatID == 1 &&
xid->gtrid_length == WSREP_XID_GTRID_LEN &&
xid->bqual_length == 0 &&
!memcmp(xid->data, WSREP_XID_PREFIX, WSREP_XID_PREFIX_LEN)));
}
/***********************************************************************//**
Retrieve binary WSREP UUID from XID.
@return binary WSREP UUID represenataion, if UUID is valid, or
WSREP_UUID_UNDEFINED otherwise.
*/
static
const wsrep_uuid_t*
wsrep_xid_uuid(
/*===========*/
const XID* xid)
{
if (wsrep_is_wsrep_xid(xid)) {
return(reinterpret_cast<const wsrep_uuid_t*>
(xid->data + WSREP_XID_UUID_OFFSET));
} else {
return(&WSREP_UUID_UNDEFINED);
}
}
/***********************************************************************//**
Retrieve WSREP seqno from XID.
@return WSREP seqno, if it is valid, or WSREP_SEQNO_UNDEFINED otherwise.
*/
wsrep_seqno_t wsrep_xid_seqno(
/*==========================*/
const XID* xid)
{
if (wsrep_is_wsrep_xid(xid)) {
wsrep_seqno_t seqno;
memcpy(&seqno, xid->data + WSREP_XID_SEQNO_OFFSET,
sizeof(wsrep_seqno_t));
return(seqno);
} else {
return(WSREP_SEQNO_UNDEFINED);
}
}
/***********************************************************************//**
Write UUID to string.
@return length of UUID string representation or -EMSGSIZE if string is too
short.
*/
static
int
wsrep_uuid_print(
/*=============*/
const wsrep_uuid_t* uuid,
char* str,
size_t str_len)
{
if (str_len > 36) {
const unsigned char* u = uuid->data;
return snprintf(str, str_len,
"%02x%02x%02x%02x-%02x%02x-%02x%02x-"
"%02x%02x-%02x%02x%02x%02x%02x%02x",
u[ 0], u[ 1], u[ 2], u[ 3], u[ 4], u[ 5], u[ 6],
u[ 7], u[ 8], u[ 9], u[10], u[11], u[12], u[13],
u[14], u[15]);
}
else {
return -EMSGSIZE;
}
}
/***********************************************************************
Store Galera checkpoint info in the 'xtrabackup_galera_info' file, if that
information is present in the trx system header. Otherwise, do nothing. */
void
xb_write_galera_info(bool incremental_prepare)
/*==================*/
{
FILE* fp;
XID xid;
char uuid_str[40];
wsrep_seqno_t seqno;
MY_STAT statinfo;
/* Do not overwrite existing an existing file to be compatible with
servers with older server versions */
if (!incremental_prepare &&
my_stat(XB_GALERA_INFO_FILENAME, &statinfo, MYF(0)) != NULL) {
return;
}
memset(&xid, 0, sizeof(xid));
xid.formatID = -1;
if (!trx_sys_read_wsrep_checkpoint(&xid)) {
return;
}
if (wsrep_uuid_print(wsrep_xid_uuid(&xid), uuid_str,
sizeof(uuid_str)) < 0) {
return;
}
fp = fopen(XB_GALERA_INFO_FILENAME, "w");
if (fp == NULL) {
msg("mariabackup: error: "
"could not create " XB_GALERA_INFO_FILENAME
", errno = %d\n",
errno);
exit(EXIT_FAILURE);
}
seqno = wsrep_xid_seqno(&xid);
msg("mariabackup: Recovered WSREP position: %s:%lld\n",
uuid_str, (long long) seqno);
if (fprintf(fp, "%s:%lld", uuid_str, (long long) seqno) < 0) {
msg("mariabackup: error: "
"could not write to " XB_GALERA_INFO_FILENAME
", errno = %d\n",
errno);
exit(EXIT_FAILURE);
}
fclose(fp);
}
#endif
|
