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Sdditional fix-up for bug #26380: LOCK TABLES + FLUSH LOGS causes deadlock

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FLUSH LOGS should ignore SET GLOBAL READ_ONLY.
This commit is contained in:
ramil/ram@mysql.com/ramil.myoffice.izhnet.ru
2007-06-18 22:22:31 +05:00
parent 6ab97748fe
commit 5b22bc3bd5
3 changed files with 10 additions and 7 deletions
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11
sql/lock.cc
View File

@ -92,6 +92,7 @@ static void print_lock_error(int error, const char *);
count The number of tables to lock.
flags Options:
MYSQL_LOCK_IGNORE_GLOBAL_READ_LOCK Ignore a global read lock
MYSQL_LOCK_IGNORE_GLOBAL_READ_ONLY Ignore SET GLOBAL READ_ONLY
MYSQL_LOCK_IGNORE_FLUSH Ignore a flush tables.
MYSQL_LOCK_NOTIFY_IF_NEED_REOPEN Instead of reopening altered
or dropped tables by itself,
@ -150,11 +151,11 @@ MYSQL_LOCK *mysql_lock_tables(THD *thd, TABLE **tables, uint count,
}
}
if ( write_lock_used
&& opt_readonly
&& ! (thd->security_ctx->master_access & SUPER_ACL)
&& ! thd->slave_thread
)
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.

1
sql/mysql_priv.h
View File

@ -1765,6 +1765,7 @@ MYSQL_LOCK *mysql_lock_tables(THD *thd, TABLE **table, uint count,
#define MYSQL_LOCK_IGNORE_FLUSH 0x0002
#define MYSQL_LOCK_NOTIFY_IF_NEED_REOPEN 0x0004
#define MYSQL_OPEN_TEMPORARY_ONLY 0x0008
#define MYSQL_LOCK_IGNORE_GLOBAL_READ_ONLY 0x0010
void mysql_unlock_tables(THD *thd, MYSQL_LOCK *sql_lock);
void mysql_unlock_read_tables(THD *thd, MYSQL_LOCK *sql_lock);

5
sql/sql_base.cc
View File

@ -4020,9 +4020,10 @@ int lock_tables(THD *thd, TABLE_LIST *tables, uint count, bool *need_reopen)
TABLE **start,**ptr;
uint lock_flag= MYSQL_LOCK_NOTIFY_IF_NEED_REOPEN;
/* Don't honor the GLOBAL READ LOCK if called from a logger */
/* Ignore GLOBAL READ LOCK and GLOBAL READ_ONLY if called from a logger */
if (logger.is_privileged_thread(thd))
lock_flag|= MYSQL_LOCK_IGNORE_GLOBAL_READ_LOCK;
lock_flag|= (MYSQL_LOCK_IGNORE_GLOBAL_READ_LOCK |
MYSQL_LOCK_IGNORE_GLOBAL_READ_ONLY);
if (!(ptr=start=(TABLE**) thd->alloc(sizeof(TABLE*)*count)))
DBUG_RETURN(-1);