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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*
Atomic rename of table; RENAME TABLE t1 to t2, tmp to t1 [,...]
*/
#include "mysql_priv.h"
static TABLE_LIST *rename_tables(THD *thd, TABLE_LIST *table_list,
bool skip_error);
/*
Every second entry in the table_list is the original name and every
second entry is the new name.
*/
bool mysql_rename_tables(THD *thd, TABLE_LIST *table_list)
{
bool error=1,got_all_locks=1;
TABLE_LIST *lock_table,*ren_table=0;
DBUG_ENTER("mysql_rename_tables");
/*
Avoid problems with a rename on a table that we have locked or
if the user is trying to to do this in a transcation context
*/
if (thd->locked_tables || thd->active_transaction())
{
my_error(ER_LOCK_OR_ACTIVE_TRANSACTION,MYF(0));
DBUG_RETURN(1);
}
VOID(pthread_mutex_lock(&LOCK_open));
for (lock_table=table_list ; lock_table ; lock_table=lock_table->next)
{
int got_lock;
if ((got_lock=lock_table_name(thd,lock_table)) < 0)
goto end;
if (got_lock)
got_all_locks=0;
}
if (!got_all_locks && wait_for_locked_table_names(thd,table_list))
goto end;
if (!(ren_table=rename_tables(thd,table_list,0)))
error=0;
end:
if (ren_table)
{
/* Rename didn't succeed; rename back the tables in reverse order */
TABLE_LIST *prev=0,*table;
/* Reverse the table list */
while (table_list)
{
TABLE_LIST *next=table_list->next;
table_list->next=prev;
prev=table_list;
table_list=next;
}
table_list=prev;
/* Find the last renamed table */
for (table=table_list ;
table->next != ren_table ;
table=table->next->next) ;
table=table->next->next; // Skip error table
/* Revert to old names */
rename_tables(thd, table, 1);
/* Note that lock_table == 0 here, so the unlock loop will work */
}
/* Lets hope this doesn't fail as the result will be messy */
if (!error)
{
mysql_update_log.write(thd,thd->query,thd->query_length);
if (mysql_bin_log.is_open())
{
Query_log_event qinfo(thd, thd->query);
mysql_bin_log.write(&qinfo);
}
send_ok(&thd->net);
}
for (TABLE_LIST *table=table_list ; table != lock_table ; table=table->next)
unlock_table_name(thd,table);
pthread_cond_broadcast(&COND_refresh);
pthread_mutex_unlock(&LOCK_open);
DBUG_RETURN(error);
}
/*
Rename all tables in list; Return pointer to wrong entry if something goes
wrong. Note that the table_list may be empty!
*/
static TABLE_LIST *
rename_tables(THD *thd, TABLE_LIST *table_list, bool skip_error)
{
TABLE_LIST *ren_table,*new_table;
DBUG_ENTER("rename_tables");
for (ren_table=table_list ; ren_table ; ren_table=new_table->next)
{
db_type table_type;
char name[FN_REFLEN];
new_table=ren_table->next;
sprintf(name,"%s/%s/%s%s",mysql_data_home,
new_table->db,new_table->real_name,
reg_ext);
if (!access(name,F_OK))
{
my_error(ER_TABLE_EXISTS_ERROR,MYF(0),name);
DBUG_RETURN(ren_table); // This can't be skipped
}
sprintf(name,"%s/%s/%s%s",mysql_data_home,
ren_table->db,ren_table->real_name,
reg_ext);
if ((table_type=get_table_type(name)) == DB_TYPE_UNKNOWN)
{
my_error(ER_FILE_NOT_FOUND, MYF(0), name, my_errno);
if (!skip_error)
DBUG_RETURN(ren_table);
}
else if (mysql_rename_table(table_type,
ren_table->db, ren_table->real_name,
new_table->db, new_table->real_name))
{
if (!skip_error)
DBUG_RETURN(ren_table);
}
}
DBUG_RETURN(0);
}
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