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Fix for bug #12704 "Server crashes during trigger execution".

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This bug occurs when some trigger for table used by DML statement is created
or changed while statement was waiting in lock_tables(). In this situation
prelocking set which we have calculated becames invalid which can easily lead
to errors and even in some cases to crashes.

With proposed patch we no longer silently reopen tables in lock_tables(),
instead caller of lock_tables() becomes responsible for reopening tables and
recalculation of prelocking set.
This commit is contained in:
dlenev@mysql.com
2005-09-15 03:56:09 +04:00
parent 9300833c91
commit e231ebe5fb
16 changed files with 414 additions and 97 deletions
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7
sql/mysql_priv.h
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@ -942,7 +942,7 @@ int open_tables(THD *thd, TABLE_LIST **tables, uint *counter, uint flags);
int simple_open_n_lock_tables(THD *thd,TABLE_LIST *tables);
bool open_and_lock_tables(THD *thd,TABLE_LIST *tables);
bool open_normal_and_derived_tables(THD *thd, TABLE_LIST *tables, uint flags);
int lock_tables(THD *thd, TABLE_LIST *tables, uint counter);
int lock_tables(THD *thd, TABLE_LIST *tables, uint counter, bool *need_reopen);
TABLE *open_temporary_table(THD *thd, const char *path, const char *db,
const char *table_name, bool link_in_list);
bool rm_temporary_table(enum db_type base, char *path);
@ -950,6 +950,7 @@ void free_io_cache(TABLE *entry);
void intern_close_table(TABLE *entry);
bool close_thread_table(THD *thd, TABLE **table_ptr);
void close_temporary_tables(THD *thd);
void close_tables_for_reopen(THD *thd, TABLE_LIST *tables);
TABLE_LIST *find_table_in_list(TABLE_LIST *table,
uint offset_to_list,
const char *db_name,
@ -1227,10 +1228,12 @@ extern pthread_t signal_thread;
extern struct st_VioSSLAcceptorFd * ssl_acceptor_fd;
#endif /* HAVE_OPENSSL */
MYSQL_LOCK *mysql_lock_tables(THD *thd, TABLE **table, uint count, uint flags);
MYSQL_LOCK *mysql_lock_tables(THD *thd, TABLE **table, uint count,
uint flags, bool *need_reopen);
/* mysql_lock_tables() flags bits */
#define MYSQL_LOCK_IGNORE_GLOBAL_READ_LOCK 0x0001
#define MYSQL_LOCK_IGNORE_FLUSH 0x0002
#define MYSQL_LOCK_NOTIFY_IF_NEED_REOPEN 0x0004
void mysql_unlock_tables(THD *thd, MYSQL_LOCK *sql_lock);
void mysql_unlock_read_tables(THD *thd, MYSQL_LOCK *sql_lock);