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mariadb/sql/sql_parse.h
Davi Arnaut 4f18083b08 Bug#42643: InnoDB does not support replication of TRUNCATE TABLE 
The problem was that TRUNCATE TABLE didn't take a exclusive
lock on a table if it resorted to truncating via delete of
all rows in the table. Specifically for InnoDB tables, this
could break proper isolation as InnoDB ends up aborting some
granted locks when truncating a table.

The solution is to take a exclusive metadata lock before
TRUNCATE TABLE can proceed. This guarantees that no other
transaction is using the table.

Incompatible change: Truncate via delete no longer fails
if sql_safe_updates is activated (this was a undocumented
side effect).

libmysqld/CMakeLists.txt:
  Add new files to the build list.
libmysqld/Makefile.am:
  Add new files to the build list.
mysql-test/extra/binlog_tests/binlog_truncate.test:
  Add test case for Bug#42643
mysql-test/include/mix1.inc:
  Update test case as TRUNCATE TABLE now grabs a exclusive lock.
  Ensure that TRUNCATE waits for granted locks on the table.
mysql-test/suite/binlog/t/binlog_truncate_innodb.test:
  As with other data modifying statements, TRUNCATE is still not
  possible in a transaction with isolation level READ COMMITTED
  or READ UNCOMMITED. It would be possible to implement so, but
  it is not worth the effort.
mysql-test/suite/binlog/t/binlog_truncate_myisam.test:
  Test under different binlog formats.
mysql-test/suite/binlog/t/disabled.def:
  Re-enable test case.
mysql-test/t/innodb_bug38231.test:
  Truncate no longer works with row-level locks.
mysql-test/t/mdl_sync.test:
  Ensure that a acquired lock is not given up due to a conflict.
mysql-test/t/partition_innodb_semi_consistent.test:
  End transaction as to release metadata locks.
mysql-test/t/truncate.test:
  A metadata lock is now taken before the object is verified.
sql/CMakeLists.txt:
  Add new files to the build list.
sql/Makefile.am:
  Add new files to the build list.
sql/datadict.cc:
  Introduce a new file specific for data dictionary operations.
sql/datadict.h:
  Add header file.
sql/sql_base.cc:
  Rename data dictionary function.
sql/sql_bitmap.h:
  Include dependency.
sql/sql_delete.cc:
  Move away from relying on mysql_delete() to delete all rows of
  a table. Thus, move any bits related to truncate to sql_truncate.cc
sql/sql_delete.h:
  Remove parameter.
sql/sql_parse.cc:
  Add protection against the global read lock -- a intention
  exclusive lock can be acquired in the truncate path.
sql/sql_show.cc:
  Add sync point for testing scenarios where a pending flush
  is ignored.
sql/sql_truncate.cc:
  Acquire a shared metadata lock before accessing table metadata.
  Upgrade the lock to a exclusive one if the table can be re-created.
  Rework binlog rules to better reflect the requirements.
sql/sql_yacc.yy:
  Set appropriate lock types for table to be truncated.
sql/table.h:
  Move to data dictionary header.
2010-05-25 17:01:38 -03:00

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/* Copyright 2006-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
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 St, Fifth Floor, Boston, MA 02110-1301 USA */
#ifndef SQL_PARSE_INCLUDED
#define SQL_PARSE_INCLUDED
#include "my_global.h" /* NO_EMBEDDED_ACCESS_CHECKS */
#include "sql_acl.h" /* GLOBAL_ACLS */
class Comp_creator;
class Item;
class Object_creation_ctx;
class Parser_state;
struct TABLE_LIST;
class THD;
class Table_ident;
struct LEX;
enum enum_mysql_completiontype {
ROLLBACK_RELEASE=-2, ROLLBACK=1, ROLLBACK_AND_CHAIN=7,
COMMIT_RELEASE=-1, COMMIT=0, COMMIT_AND_CHAIN=6
};
extern "C" int test_if_data_home_dir(const char *dir);
bool multi_update_precheck(THD *thd, TABLE_LIST *tables);
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables);
int mysql_multi_update_prepare(THD *thd);
int mysql_multi_delete_prepare(THD *thd);
bool mysql_insert_select_prepare(THD *thd);
bool update_precheck(THD *thd, TABLE_LIST *tables);
bool delete_precheck(THD *thd, TABLE_LIST *tables);
bool insert_precheck(THD *thd, TABLE_LIST *tables);
bool create_table_precheck(THD *thd, TABLE_LIST *tables,
TABLE_LIST *create_table);
bool parse_sql(THD *thd,
Parser_state *parser_state,
Object_creation_ctx *creation_ctx);
uint kill_one_thread(THD *thd, ulong id, bool only_kill_query);
void sql_kill(THD *thd, ulong id, bool only_kill_query);
void free_items(Item *item);
void cleanup_items(Item *item);
Comp_creator *comp_eq_creator(bool invert);
Comp_creator *comp_ge_creator(bool invert);
Comp_creator *comp_gt_creator(bool invert);
Comp_creator *comp_le_creator(bool invert);
Comp_creator *comp_lt_creator(bool invert);
Comp_creator *comp_ne_creator(bool invert);
int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident,
enum enum_schema_tables schema_table_idx);
void get_default_definer(THD *thd, LEX_USER *definer);
LEX_USER *create_default_definer(THD *thd);
LEX_USER *create_definer(THD *thd, LEX_STRING *user_name, LEX_STRING *host_name);
LEX_USER *get_current_user(THD *thd, LEX_USER *user);
bool check_string_byte_length(LEX_STRING *str, const char *err_msg,
uint max_byte_length);
bool check_string_char_length(LEX_STRING *str, const char *err_msg,
uint max_char_length, CHARSET_INFO *cs,
bool no_error);
CHARSET_INFO* merge_charset_and_collation(CHARSET_INFO *cs, CHARSET_INFO *cl);
bool check_host_name(LEX_STRING *str);
bool check_identifier_name(LEX_STRING *str, uint max_char_length,
uint err_code, const char *param_for_err_msg);
bool mysql_test_parse_for_slave(THD *thd,char *inBuf,uint length);
bool is_update_query(enum enum_sql_command command);
bool is_log_table_write_query(enum enum_sql_command command);
bool alloc_query(THD *thd, const char *packet, uint packet_length);
void mysql_init_select(LEX *lex);
void mysql_parse(THD *thd, const char *inBuf, uint length,
Parser_state *parser_state);
void mysql_reset_thd_for_next_command(THD *thd);
bool mysql_new_select(LEX *lex, bool move_down);
void create_select_for_variable(const char *var_name);
void create_table_set_open_action_and_adjust_tables(LEX *lex);
void mysql_init_multi_delete(LEX *lex);
bool multi_delete_set_locks_and_link_aux_tables(LEX *lex);
void create_table_set_open_action_and_adjust_tables(LEX *lex);
pthread_handler_t handle_bootstrap(void *arg);
bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
bool *write_to_binlog);
int mysql_execute_command(THD *thd);
bool do_command(THD *thd);
void do_handle_bootstrap(THD *thd);
bool dispatch_command(enum enum_server_command command, THD *thd,
char* packet, uint packet_length);
void log_slow_statement(THD *thd);
bool append_file_to_dir(THD *thd, const char **filename_ptr,
const char *table_name);
bool append_file_to_dir(THD *thd, const char **filename_ptr,
const char *table_name);
void execute_init_command(THD *thd, LEX_STRING *init_command,
mysql_rwlock_t *var_lock);
bool add_field_to_list(THD *thd, LEX_STRING *field_name, enum enum_field_types type,
char *length, char *decimal,
uint type_modifier,
Item *default_value, Item *on_update_value,
LEX_STRING *comment,
char *change, List<String> *interval_list,
CHARSET_INFO *cs,
uint uint_geom_type);
bool add_to_list(THD *thd, SQL_LIST &list,Item *group,bool asc);
void add_join_on(TABLE_LIST *b,Item *expr);
void add_join_natural(TABLE_LIST *a,TABLE_LIST *b,List<String> *using_fields,
SELECT_LEX *lex);
bool add_proc_to_list(THD *thd, Item *item);
bool push_new_name_resolution_context(THD *thd,
TABLE_LIST *left_op,
TABLE_LIST *right_op);
void store_position_for_column(const char *name);
void init_update_queries(void);
bool check_simple_select();
Item *negate_expression(THD *thd, Item *expr);
bool check_stack_overrun(THD *thd, long margin, uchar *dummy);
/* Variables */
extern const char* any_db;
extern uint sql_command_flags[];
extern uint server_command_flags[];
extern const LEX_STRING command_name[];
extern uint server_command_flags[];
/* Inline functions */
inline bool check_identifier_name(LEX_STRING *str, uint err_code)
{
return check_identifier_name(str, NAME_CHAR_LEN, err_code, "");
}
inline bool check_identifier_name(LEX_STRING *str)
{
return check_identifier_name(str, NAME_CHAR_LEN, 0, "");
}
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *tables);
bool check_single_table_access(THD *thd, ulong privilege,
TABLE_LIST *tables, bool no_errors);
bool check_routine_access(THD *thd,ulong want_access,char *db,char *name,
bool is_proc, bool no_errors);
bool check_some_access(THD *thd, ulong want_access, TABLE_LIST *table);
bool check_some_routine_access(THD *thd, const char *db, const char *name, bool is_proc);
bool check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
GRANT_INTERNAL_INFO *grant_internal_info,
bool dont_check_global_grants, bool no_errors);
bool check_table_access(THD *thd, ulong requirements,TABLE_LIST *tables,
bool any_combination_of_privileges_will_do,
uint number,
bool no_errors);
#else
inline bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *tables)
{ return false; }
inline bool check_single_table_access(THD *thd, ulong privilege,
TABLE_LIST *tables, bool no_errors)
{ return false; }
inline bool check_routine_access(THD *thd,ulong want_access,char *db,
char *name, bool is_proc, bool no_errors)
{ return false; }
inline bool check_some_access(THD *thd, ulong want_access, TABLE_LIST *table)
{
table->grant.privilege= want_access;
return false;
}
inline bool check_merge_table_access(THD *thd, char *db, TABLE_LIST *table_list)
{ return false; }
inline bool check_some_routine_access(THD *thd, const char *db,
const char *name, bool is_proc)
{ return false; }
inline bool check_access(THD *thd, ulong access, const char *db,
ulong *save_priv, bool no_grant, bool no_errors,
bool schema_db)
{
if (save_priv)
*save_priv= GLOBAL_ACLS;
return false;
}
inline bool
check_table_access(THD *thd, ulong requirements,TABLE_LIST *tables,
bool any_combination_of_privileges_will_do,
uint number,
bool no_errors)
{ return false; }
#endif /*NO_EMBEDDED_ACCESS_CHECKS*/
/* These were under the INNODB_COMPATIBILITY_HOOKS */
bool check_global_access(THD *thd, ulong want_access);
#endif /* SQL_PARSE_INCLUDED */
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