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Commit b1174089 authored by Davi Arnaut's avatar Davi Arnaut
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Bug#33669: Transactional temporary tables do not work under --read-only 

The problem was that in read only mode (read_only enabled),
the server would mistakenly deny data modification attempts
for temporary tables which belong to a transactional storage
engine (eg. InnoDB).

The solution is to allow transactional temporary tables to be
modified under read only mode. As a whole, the read only mode
does not apply to any kind of temporary table.


mysql-test/r/read_only_innodb.result:
  Add test case result for Bug#33669
mysql-test/t/read_only_innodb.test:
  Add test case for Bug#33669
sql/lock.cc:
  Rename mysql_lock_tables_check to lock_tables_check and make
  it static. Move locking related checks from get_lock_data to
  lock_tables_check. Allow write locks to temporary tables even
  under read-only.
parent e58f200a
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Showing with 363 additions and 59 deletions
mysql-test/r/read_only_innodb.result
View file @ b1174089
......@@ -46,3 +46,174 @@ UNLOCK TABLES;
DROP TABLE t1;
DROP USER test@localhost;
echo End of 5.1 tests
#
# Bug#33669: Transactional temporary tables do not work under --read-only
#
DROP DATABASE IF EXISTS db1;
# Setup user and tables
CREATE USER bug33669@localhost;
CREATE DATABASE db1;
CREATE TABLE db1.t1 (a INT) ENGINE=INNODB;
CREATE TABLE db1.t2 (a INT) ENGINE=INNODB;
INSERT INTO db1.t1 VALUES (1);
INSERT INTO db1.t2 VALUES (2);
GRANT CREATE TEMPORARY TABLES, DROP, INSERT, DELETE, UPDATE,
SELECT, LOCK TABLES ON db1.* TO bug33669@localhost;
SET GLOBAL READ_ONLY = ON;
# Connection con1 (user bug33669):
# Create, insert and drop temporary table:
CREATE TEMPORARY TABLE temp (a INT) ENGINE=INNODB;
INSERT INTO temp VALUES (1);
DROP TABLE temp;
# Lock base tables and use temporary table:
CREATE TEMPORARY TABLE temp (a INT) ENGINE=INNODB;
LOCK TABLES t1 READ, t2 READ;
SELECT * FROM t1;
a
1
INSERT INTO temp values (1);
SELECT * FROM t2;
a
2
UNLOCK TABLES;
DROP TABLE temp;
# Transaction
BEGIN;
SELECT * FROM t1;
a
1
CREATE TEMPORARY TABLE temp (a INT) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement
INSERT INTO temp VALUES (1);
SELECT * FROM t2;
a
2
ROLLBACK;
SELECT * FROM temp;
a
DROP TABLE temp;
# Lock base table as READ and temporary table as WRITE:
CREATE TEMPORARY TABLE temp (a INT) ENGINE=INNODB;
LOCK TABLES t1 READ, temp WRITE;
SELECT * FROM t1;
a
1
SELECT * FROM temp;
a
INSERT INTO t1 VALUES (1);
ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement
INSERT INTO temp VALUES (1);
DROP TABLE temp;
UNLOCK TABLES;
# Lock temporary table that shadows a base table:
CREATE TEMPORARY TABLE t1 (a INT) ENGINE=INNODB;
LOCK TABLES t1 WRITE;
DROP TABLE t1;
SELECT * FROM t1;
ERROR HY000: Table 't1' was not locked with LOCK TABLES
# INSERT SELECT from base table into temporary table:
CREATE TEMPORARY TABLE temp1 (a INT) ENGINE=INNODB;
CREATE TEMPORARY TABLE temp2 LIKE temp1;
BEGIN;
INSERT INTO temp1 VALUES (10);
INSERT INTO temp2 VALUES (10);
INSERT INTO temp1 SELECT * FROM t1;
INSERT INTO temp2 SELECT * FROM t2;
SELECT * FROM temp1 ORDER BY a;
a
1
10
SELECT * FROM temp2 ORDER BY a;
a
2
10
ROLLBACK;
SELECT * FROM temp1,temp2;
a a
LOCK TABLES t1 READ, t2 READ;
INSERT INTO temp1 VALUES (10);
INSERT INTO temp2 VALUES (10);
INSERT INTO temp1 SELECT * FROM t1;
INSERT INTO temp2 SELECT * FROM t2;
SELECT * FROM temp1 ORDER BY a;
a
1
10
SELECT * FROM temp2 ORDER BY a;
a
2
10
UNLOCK TABLES;
DELETE temp1, temp2 FROM temp1, temp2;
INSERT INTO temp1 VALUES (10);
INSERT INTO temp2 VALUES (10);
INSERT INTO temp1 SELECT * FROM t1;
INSERT INTO temp2 SELECT * FROM t2;
SELECT * FROM temp1 ORDER BY a;
a
1
10
SELECT * FROM temp2 ORDER BY a;
a
2
10
DROP TABLE temp1, temp2;
# INSERT and INSERT SELECT that uses subqueries:
CREATE TEMPORARY TABLE temp1 (a INT) ENGINE=INNODB;
CREATE TEMPORARY TABLE temp2 LIKE temp1;
INSERT INTO temp1 (a) VALUES ((SELECT MAX(a) FROM t1));
LOCK TABLES t2 READ;
INSERT INTO temp2 (a) VALUES ((SELECT MAX(a) FROM t2));
UNLOCK TABLES;
LOCK TABLES t1 READ, t2 READ;
INSERT INTO temp1 SELECT * FROM t1 WHERE a < (SELECT MAX(a) FROM t2);
INSERT INTO temp2 SELECT * FROM t2 WHERE a > (SELECT MAX(a) FROM t1);
UNLOCK TABLES;
INSERT INTO temp1 SELECT * FROM t1 WHERE a < (SELECT MAX(a) FROM t2);
INSERT INTO temp2 SELECT * FROM t2 WHERE a > (SELECT MAX(a) FROM t1);
SELECT * FROM temp1 ORDER BY a;
a
1
1
1
SELECT * FROM temp2 ORDER BY a;
a
2
2
2
DROP TABLE temp1, temp2;
# Multiple table update:
CREATE TEMPORARY TABLE temp1 (a INT) ENGINE=INNODB;
CREATE TEMPORARY TABLE temp2 LIKE temp1;
INSERT INTO temp1 VALUES (1),(2);
INSERT INTO temp2 VALUES (3),(4);
UPDATE temp1,temp2 SET temp1.a = 5, temp2.a = 10;
SELECT * FROM temp1, temp2;
a a
5 10
5 10
5 10
5 10
DROP TABLE temp1, temp2;
# Disconnect and cleanup
SET GLOBAL READ_ONLY = OFF;
DROP USER bug33669@localhost;
DROP DATABASE db1;
mysql-test/t/read_only_innodb.test
View file @ b1174089
......@@ -83,3 +83,149 @@ DROP USER test@localhost;
disconnect con1;
--echo echo End of 5.1 tests
--echo #
--echo # Bug#33669: Transactional temporary tables do not work under --read-only
--echo #
--disable_warnings
DROP DATABASE IF EXISTS db1;
--enable_warnings
--echo # Setup user and tables
CREATE USER bug33669@localhost;
CREATE DATABASE db1;
CREATE TABLE db1.t1 (a INT) ENGINE=INNODB;
CREATE TABLE db1.t2 (a INT) ENGINE=INNODB;
INSERT INTO db1.t1 VALUES (1);
INSERT INTO db1.t2 VALUES (2);
GRANT CREATE TEMPORARY TABLES, DROP, INSERT, DELETE, UPDATE,
SELECT, LOCK TABLES ON db1.* TO bug33669@localhost;
SET GLOBAL READ_ONLY = ON;
connect(con1,localhost,bug33669,,db1);
--echo # Connection con1 (user bug33669):
--echo
--echo # Create, insert and drop temporary table:
--echo
CREATE TEMPORARY TABLE temp (a INT) ENGINE=INNODB;
INSERT INTO temp VALUES (1);
DROP TABLE temp;
--echo
--echo # Lock base tables and use temporary table:
--echo
CREATE TEMPORARY TABLE temp (a INT) ENGINE=INNODB;
LOCK TABLES t1 READ, t2 READ;
SELECT * FROM t1;
INSERT INTO temp values (1);
SELECT * FROM t2;
UNLOCK TABLES;
DROP TABLE temp;
--echo
--echo # Transaction
--echo
BEGIN;
SELECT * FROM t1;
CREATE TEMPORARY TABLE temp (a INT) ENGINE=INNODB;
--error ER_OPTION_PREVENTS_STATEMENT
INSERT INTO t1 VALUES (1);
INSERT INTO temp VALUES (1);
SELECT * FROM t2;
ROLLBACK;
SELECT * FROM temp;
DROP TABLE temp;
--echo
--echo # Lock base table as READ and temporary table as WRITE:
--echo
CREATE TEMPORARY TABLE temp (a INT) ENGINE=INNODB;
LOCK TABLES t1 READ, temp WRITE;
SELECT * FROM t1;
SELECT * FROM temp;
--error ER_OPTION_PREVENTS_STATEMENT
INSERT INTO t1 VALUES (1);
INSERT INTO temp VALUES (1);
DROP TABLE temp;
UNLOCK TABLES;
--echo
--echo # Lock temporary table that shadows a base table:
--echo
CREATE TEMPORARY TABLE t1 (a INT) ENGINE=INNODB;
LOCK TABLES t1 WRITE;
DROP TABLE t1;
--error ER_TABLE_NOT_LOCKED
SELECT * FROM t1;
--echo
--echo # INSERT SELECT from base table into temporary table:
--echo
CREATE TEMPORARY TABLE temp1 (a INT) ENGINE=INNODB;
CREATE TEMPORARY TABLE temp2 LIKE temp1;
BEGIN;
INSERT INTO temp1 VALUES (10);
INSERT INTO temp2 VALUES (10);
INSERT INTO temp1 SELECT * FROM t1;
INSERT INTO temp2 SELECT * FROM t2;
SELECT * FROM temp1 ORDER BY a;
SELECT * FROM temp2 ORDER BY a;
ROLLBACK;
SELECT * FROM temp1,temp2;
LOCK TABLES t1 READ, t2 READ;
INSERT INTO temp1 VALUES (10);
INSERT INTO temp2 VALUES (10);
INSERT INTO temp1 SELECT * FROM t1;
INSERT INTO temp2 SELECT * FROM t2;
SELECT * FROM temp1 ORDER BY a;
SELECT * FROM temp2 ORDER BY a;
UNLOCK TABLES;
DELETE temp1, temp2 FROM temp1, temp2;
INSERT INTO temp1 VALUES (10);
INSERT INTO temp2 VALUES (10);
INSERT INTO temp1 SELECT * FROM t1;
INSERT INTO temp2 SELECT * FROM t2;
SELECT * FROM temp1 ORDER BY a;
SELECT * FROM temp2 ORDER BY a;
DROP TABLE temp1, temp2;
--echo
--echo # INSERT and INSERT SELECT that uses subqueries:
CREATE TEMPORARY TABLE temp1 (a INT) ENGINE=INNODB;
CREATE TEMPORARY TABLE temp2 LIKE temp1;
INSERT INTO temp1 (a) VALUES ((SELECT MAX(a) FROM t1));
LOCK TABLES t2 READ;
INSERT INTO temp2 (a) VALUES ((SELECT MAX(a) FROM t2));
UNLOCK TABLES;
LOCK TABLES t1 READ, t2 READ;
INSERT INTO temp1 SELECT * FROM t1 WHERE a < (SELECT MAX(a) FROM t2);
INSERT INTO temp2 SELECT * FROM t2 WHERE a > (SELECT MAX(a) FROM t1);
UNLOCK TABLES;
INSERT INTO temp1 SELECT * FROM t1 WHERE a < (SELECT MAX(a) FROM t2);
INSERT INTO temp2 SELECT * FROM t2 WHERE a > (SELECT MAX(a) FROM t1);
SELECT * FROM temp1 ORDER BY a;
SELECT * FROM temp2 ORDER BY a;
DROP TABLE temp1, temp2;
--echo
--echo # Multiple table update:
--echo
CREATE TEMPORARY TABLE temp1 (a INT) ENGINE=INNODB;
CREATE TEMPORARY TABLE temp2 LIKE temp1;
INSERT INTO temp1 VALUES (1),(2);
INSERT INTO temp2 VALUES (3),(4);
UPDATE temp1,temp2 SET temp1.a = 5, temp2.a = 10;
SELECT * FROM temp1, temp2;
DROP TABLE temp1, temp2;
--echo
--echo # Disconnect and cleanup
--echo
disconnect con1;
connection default;
SET GLOBAL READ_ONLY = OFF;
DROP USER bug33669@localhost;
DROP DATABASE db1;
sql/lock.cc
View file @ b1174089
......@@ -89,8 +89,8 @@ extern HASH open_cache;
#define GET_LOCK_UNLOCK 1
#define GET_LOCK_STORE_LOCKS 2
static MYSQL_LOCK *get_lock_data(THD *thd, TABLE **table,uint count,
uint flags, TABLE **write_locked);
static MYSQL_LOCK *get_lock_data(THD *thd, TABLE **table_ptr, uint count,
uint flags);
static int lock_external(THD *thd, TABLE **table,uint count);
static int unlock_external(THD *thd, TABLE **table,uint count);
static void print_lock_error(int error, const char *);
......@@ -107,15 +107,18 @@ static int thr_lock_errno_to_mysql[]=
@param flags Lock flags
@return 0 if all the check passed, non zero if a check failed.
*/
int mysql_lock_tables_check(THD *thd, TABLE **tables, uint count, uint flags)
static int
lock_tables_check(THD *thd, TABLE **tables, uint count,
bool *write_lock_used, uint flags)
{
bool log_table_write_query;
uint system_count;
uint i;
uint system_count, i;
bool is_superuser, log_table_write_query;
DBUG_ENTER("mysql_lock_tables_check");
DBUG_ENTER("lock_tables_check");
system_count= 0;
*write_lock_used= FALSE;
is_superuser= thd->security_ctx->master_access & SUPER_ACL;
log_table_write_query= (is_log_table_write_query(thd->lex->sql_command)
|| ((flags & MYSQL_LOCK_PERF_SCHEMA) != 0));
......@@ -148,10 +151,18 @@ int mysql_lock_tables_check(THD *thd, TABLE **tables, uint count, uint flags)
}
}
if ((t->s->table_category == TABLE_CATEGORY_SYSTEM) &&
(t->reginfo.lock_type >= TL_WRITE_ALLOW_WRITE))
if (t->reginfo.lock_type >= TL_WRITE_ALLOW_WRITE)
{
system_count++;
*write_lock_used= TRUE;
if (t->s->table_category == TABLE_CATEGORY_SYSTEM)
system_count++;
if (t->db_stat & HA_READ_ONLY)
{
my_error(ER_OPEN_AS_READONLY, MYF(0), t->alias);
DBUG_RETURN(1);
}
}
/*
......@@ -172,6 +183,20 @@ int mysql_lock_tables_check(THD *thd, TABLE **tables, uint count, uint flags)
thd->mdl_context.is_lock_owner(MDL_key::TABLE,
t->s->db.str, t->s->table_name.str,
MDL_SHARED)));
/*
Prevent modifications to base tables if READ_ONLY is activated.
In any case, read only does not apply to temporary tables.
*/
if (!(flags & MYSQL_LOCK_IGNORE_GLOBAL_READ_ONLY) && !t->s->tmp_table)
{
if (t->reginfo.lock_type >= TL_WRITE_ALLOW_WRITE &&
!is_superuser && opt_readonly && !thd->slave_thread)
{
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
DBUG_RETURN(1);
}
}
}
/*
......@@ -267,15 +292,15 @@ static void reset_lock_data_and_free(MYSQL_LOCK **mysql_lock)
MYSQL_LOCK *mysql_lock_tables(THD *thd, TABLE **tables, uint count,
uint flags, bool *need_reopen)
{
MYSQL_LOCK *sql_lock;
TABLE *write_lock_used;
int rc;
MYSQL_LOCK *sql_lock;
bool write_lock_used;
DBUG_ENTER("mysql_lock_tables");
*need_reopen= FALSE;
if (mysql_lock_tables_check(thd, tables, count, flags))
if (lock_tables_check(thd, tables, count, &write_lock_used, flags))
DBUG_RETURN (NULL);
ulong timeout= (flags & MYSQL_LOCK_IGNORE_TIMEOUT) ?
......@@ -283,8 +308,7 @@ MYSQL_LOCK *mysql_lock_tables(THD *thd, TABLE **tables, uint count,
for (;;)
{
if (! (sql_lock= get_lock_data(thd, tables, count, GET_LOCK_STORE_LOCKS,
&write_lock_used)))
if (! (sql_lock= get_lock_data(thd, tables, count, GET_LOCK_STORE_LOCKS)))
break;
if (global_read_lock && write_lock_used &&
......@@ -308,21 +332,6 @@ MYSQL_LOCK *mysql_lock_tables(THD *thd, TABLE **tables, uint count,
}
}
if (!(flags & MYSQL_LOCK_IGNORE_GLOBAL_READ_ONLY) &&
write_lock_used &&
opt_readonly &&
!(thd->security_ctx->master_access & SUPER_ACL) &&
!thd->slave_thread)
{
/*
Someone has issued SET GLOBAL READ_ONLY=1 and we want a write lock.
We do not wait for READ_ONLY=0, and fail.
*/
reset_lock_data_and_free(&sql_lock);
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
break;
}
thd_proc_info(thd, "System lock");
DBUG_PRINT("info", ("thd->proc_info %s", thd->proc_info));
if (sql_lock->table_count && lock_external(thd, sql_lock->table,
......@@ -459,9 +468,7 @@ void mysql_unlock_tables(THD *thd, MYSQL_LOCK *sql_lock)
void mysql_unlock_some_tables(THD *thd, TABLE **table,uint count)
{
MYSQL_LOCK *sql_lock;
TABLE *write_lock_used;
if ((sql_lock= get_lock_data(thd, table, count, GET_LOCK_UNLOCK,
&write_lock_used)))
if ((sql_lock= get_lock_data(thd, table, count, GET_LOCK_UNLOCK)))
mysql_unlock_tables(thd, sql_lock);
}
......@@ -603,9 +610,7 @@ void mysql_lock_downgrade_write(THD *thd, TABLE *table,
thr_lock_type new_lock_type)
{
MYSQL_LOCK *locked;
TABLE *write_lock_used;
if ((locked = get_lock_data(thd, &table, 1, GET_LOCK_UNLOCK,
&write_lock_used)))
if ((locked = get_lock_data(thd, &table, 1, GET_LOCK_UNLOCK)))
{
for (uint i=0; i < locked->lock_count; i++)
thr_downgrade_write_lock(locked->locks[i], new_lock_type);
......@@ -619,11 +624,9 @@ void mysql_lock_downgrade_write(THD *thd, TABLE *table,
void mysql_lock_abort(THD *thd, TABLE *table, bool upgrade_lock)
{
MYSQL_LOCK *locked;
TABLE *write_lock_used;
DBUG_ENTER("mysql_lock_abort");
if ((locked= get_lock_data(thd, &table, 1, GET_LOCK_UNLOCK,
&write_lock_used)))
if ((locked= get_lock_data(thd, &table, 1, GET_LOCK_UNLOCK)))
{
for (uint i=0; i < locked->lock_count; i++)
thr_abort_locks(locked->locks[i]->lock, upgrade_lock);
......@@ -648,12 +651,10 @@ void mysql_lock_abort(THD *thd, TABLE *table, bool upgrade_lock)
bool mysql_lock_abort_for_thread(THD *thd, TABLE *table)
{
MYSQL_LOCK *locked;
TABLE *write_lock_used;
bool result= FALSE;
DBUG_ENTER("mysql_lock_abort_for_thread");
if ((locked= get_lock_data(thd, &table, 1, GET_LOCK_UNLOCK,
&write_lock_used)))
if ((locked= get_lock_data(thd, &table, 1, GET_LOCK_UNLOCK)))
{
for (uint i=0; i < locked->lock_count; i++)
{
......@@ -848,11 +849,10 @@ static int unlock_external(THD *thd, TABLE **table,uint count)
@param flags One of:
- GET_LOCK_UNLOCK : If we should send TL_IGNORE to store lock
- GET_LOCK_STORE_LOCKS : Store lock info in TABLE
@param write_lock_used Store pointer to last table with WRITE_ALLOW_WRITE
*/
static MYSQL_LOCK *get_lock_data(THD *thd, TABLE **table_ptr, uint count,
uint flags, TABLE **write_lock_used)
uint flags)
{
uint i,tables,lock_count;
MYSQL_LOCK *sql_lock;
......@@ -861,9 +861,8 @@ static MYSQL_LOCK *get_lock_data(THD *thd, TABLE **table_ptr, uint count,
DBUG_ENTER("get_lock_data");
DBUG_ASSERT((flags == GET_LOCK_UNLOCK) || (flags == GET_LOCK_STORE_LOCKS));
DBUG_PRINT("info", ("count %d", count));
*write_lock_used=0;
for (i=tables=lock_count=0 ; i < count ; i++)
{
TABLE *t= table_ptr[i];
......@@ -895,24 +894,12 @@ static MYSQL_LOCK *get_lock_data(THD *thd, TABLE **table_ptr, uint count,
{
TABLE *table;
enum thr_lock_type lock_type;
THR_LOCK_DATA **org_locks = locks;
if ((table=table_ptr[i])->s->tmp_table == NON_TRANSACTIONAL_TMP_TABLE)
continue;
lock_type= table->reginfo.lock_type;
DBUG_ASSERT(lock_type != TL_WRITE_DEFAULT && lock_type != TL_READ_DEFAULT);
if (lock_type >= TL_WRITE_ALLOW_WRITE)
{
*write_lock_used=table;
if (table->db_stat & HA_READ_ONLY)
{
my_error(ER_OPEN_AS_READONLY,MYF(0),table->alias);
/* Clear the lock type of the lock data that are stored already. */
sql_lock->lock_count= (uint) (locks - sql_lock->locks);
reset_lock_data_and_free(&sql_lock);
DBUG_RETURN(0);
}
}
THR_LOCK_DATA **org_locks = locks;
locks_start= locks;
locks= table->file->store_lock(thd, locks,
(flags & GET_LOCK_UNLOCK) ? TL_IGNORE :
......
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