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Reverted patch for new usage of open_count as it caused more problems than it solved

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Cleaned up patch for checking locks for multi-table updates


myisam/mi_close.c:
  Reverted patch for new usage of open_counts
myisam/mi_locking.c:
  Reverted patch for new usage of open_counts
sql/ha_myisam.cc:
  Reverted patch for new usage of open_counts
sql/handler.cc:
  Removed compiler warning
sql/sql_acl.cc:
  Removed compiler warning
sql/sql_table.cc:
  No need to unlock after failed call to external_lock()
sql/sql_update.cc:
  Cleaned up (and made it more secure) patch for checking locks for multi-table updates
This commit is contained in:
unknown
2004-10-06 01:24:21 +03:00
parent c0364263d9
commit 0d76cb7ea4
7 changed files with 116 additions and 158 deletions
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112
sql/sql_update.cc
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@ -386,6 +386,24 @@ err:
Update multiple tables from join
***************************************************************************/
/*
Get table map for list of Item_field
*/
static table_map get_table_map(List<Item> *items)
{
List_iterator_fast<Item> item_it(*items);
Item_field *item;
table_map map= 0;
while ((item= (Item_field *) item_it++))
map|= item->used_tables();
DBUG_PRINT("info",("table_map: 0x%08x", map));
return map;
}
/*
Setup multi-update handling and call SELECT to do the join
*/
@ -401,59 +419,45 @@ int mysql_multi_update(THD *thd,
int res;
multi_update *result;
TABLE_LIST *tl;
const bool locked= !(thd->locked_tables);
const bool using_lock_tables= thd->locked_tables != 0;
DBUG_ENTER("mysql_multi_update");
thd->select_limit= HA_POS_ERROR;
for (;;)
{
table_map update_map= 0;
int tnr= 0;
table_map update_map;
int tnr;
if ((res= open_tables(thd, table_list)))
DBUG_RETURN(res);
/*
Only need to call lock_tables if (thd->locked_tables == NULL)
*/
if (locked && ((res= lock_tables(thd, table_list))))
/* Only need to call lock_tables if we are not using LOCK TABLES */
if (!using_lock_tables && ((res= lock_tables(thd, table_list))))
DBUG_RETURN(res);
thd->select_limit=HA_POS_ERROR;
/*
Ensure that we have update privilege for all tables and columns in the
SET part
While we are here, initialize the table->map field.
*/
for (tl= table_list ; tl ; tl=tl->next)
for (tl= table_list,tnr=0 ; tl ; tl=tl->next)
{
TABLE *table= tl->table;
table->grant.want_privilege= (UPDATE_ACL & ~table->grant.privilege);
table->map= (table_map) 1 << (tnr++);
}
if (!setup_fields(thd, table_list, *fields, 1, 0, 0))
{
List_iterator_fast<Item> field_it(*fields);
Item_field *item;
while ((item= (Item_field *) field_it++))
update_map|= item->used_tables();
DBUG_PRINT("info",("update_map=0x%08x", update_map));
}
else
if (setup_fields(thd, table_list, *fields, 1, 0, 0))
DBUG_RETURN(-1);
/*
Unlock the tables in preparation for relocking
*/
if (locked)
update_map= get_table_map(fields);
/* Unlock the tables in preparation for relocking */
if (!using_lock_tables)
{
pthread_mutex_lock(&LOCK_open);
mysql_unlock_tables(thd, thd->lock);
thd->lock= 0;
pthread_mutex_unlock(&LOCK_open);
}
/*
@ -474,26 +478,48 @@ int mysql_multi_update(THD *thd,
tl->lock_type= TL_READ;
tl->updating= 0;
}
if (locked)
if (!using_lock_tables)
tl->table->reginfo.lock_type= tl->lock_type;
}
/* Relock the tables with the correct modes */
res= lock_tables(thd,table_list);
if (using_lock_tables)
{
if (res)
DBUG_RETURN(res);
break; // Don't have to do setup_field()
}
/*
Relock the tables
We must setup fields again as the file may have been reopened
during lock_tables
*/
if (!(res=lock_tables(thd,table_list)))
{
List_iterator_fast<Item> field_it(*fields);
Item_field *item;
while ((item= (Item_field *) field_it++))
#if MYSQL_VERSION < 40100
item->field= item->result_field= 0;
#else
item->cleanup();
#endif
}
if (setup_fields(thd, table_list, *fields, 1, 0, 0))
DBUG_RETURN(-1);
/*
If lock succeded and the table map didn't change since the above lock
we can continue.
*/
if (!res && update_map == get_table_map(fields))
break;
if (!locked)
DBUG_RETURN(res);
List_iterator_fast<Item> field_it(*fields);
Item_field *item;
while ((item= (Item_field *) field_it++))
/* item->cleanup(); XXX Use this instead in MySQL 4.1+ */
item->field= item->result_field= 0;
/*
There was some very unexpected changes in the table definition between
open tables and lock tables. Close tables and try again.
*/
close_thread_tables(thd);
}
@ -548,7 +574,7 @@ int multi_update::prepare(List<Item> &not_used_values)
{
TABLE_LIST *table_ref;
SQL_LIST update;
table_map tables_to_update= 0;
table_map tables_to_update;
Item_field *item;
List_iterator_fast<Item> field_it(*fields);
List_iterator_fast<Item> value_it(*values);
@ -559,8 +585,7 @@ int multi_update::prepare(List<Item> &not_used_values)
thd->cuted_fields=0L;
thd->proc_info="updating main table";
while ((item= (Item_field *) field_it++))
tables_to_update|= item->used_tables();
tables_to_update= get_table_map(fields);
if (!tables_to_update)
{
@ -624,7 +649,6 @@ int multi_update::prepare(List<Item> &not_used_values)
/* Split fields into fields_for_table[] and values_by_table[] */
field_it.rewind();
while ((item= (Item_field *) field_it++))
{
Item *value= value_it++;