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/******************************************************
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 <mysql_version.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("xtrabackup: error: "
"could not create " XB_GALERA_INFO_FILENAME
", errno = %d\n",
errno);
exit(EXIT_FAILURE);
}
seqno = wsrep_xid_seqno(&xid);
msg("xtrabackup: Recovered WSREP position: %s:%lld\n",
uuid_str, (long long) seqno);
if (fprintf(fp, "%s:%lld", uuid_str, (long long) seqno) < 0) {
msg("xtrabackup: error: "
"could not write to " XB_GALERA_INFO_FILENAME
", errno = %d\n",
errno);
exit(EXIT_FAILURE);
}
fclose(fp);
}
#endif
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