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Add TL_FIRST_WRITE in SQL layer for determining R/W

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Use < TL_FIRST_WRITE for determining a READ transaction.

Use TL_FIRST_WRITE as the relative operator replacing TL_WRITE_ALLOW_WRITE
as the minimium WRITE lock type.
This commit is contained in:
Daniel Black
2021-03-24 15:41:10 +11:00
parent cf552f5886
commit 058484687a
18 changed files with 57 additions and 56 deletions
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8
sql/sql_parse.cc
View File

@ -3648,7 +3648,7 @@ mysql_execute_command(THD *thd)
{
for (TABLE_LIST *table= all_tables; table; table= table->next_global)
{
if (table->lock_type >= TL_WRITE_ALLOW_WRITE)
if (table->lock_type >= TL_FIRST_WRITE)
{
lex->sql_command= SQLCOM_BEGIN;
thd->wsrep_converted_lock_session= true;
@ -7096,7 +7096,7 @@ check_table_access(THD *thd, privilege_t requirements, TABLE_LIST *tables,
/* We want to have either SELECT or INSERT rights to sequences depending
on how they are accessed
*/
want_access= ((table_ref->lock_type == TL_WRITE_ALLOW_WRITE) ?
want_access= ((table_ref->lock_type >= TL_FIRST_WRITE) ?
INSERT_ACL : SELECT_ACL);
}
@ -8894,7 +8894,7 @@ void st_select_lex::set_lock_for_tables(thr_lock_type lock_type, bool for_update
{
tables->lock_type= lock_type;
tables->updating= for_update;
tables->mdl_request.set_type((lock_type >= TL_WRITE_ALLOW_WRITE) ?
tables->mdl_request.set_type((lock_type >= TL_FIRST_WRITE) ?
MDL_SHARED_WRITE : MDL_SHARED_READ);
}
DBUG_VOID_RETURN;
@ -9687,7 +9687,7 @@ bool multi_delete_set_locks_and_link_aux_tables(LEX *lex)
walk->updating= target_tbl->updating;
walk->lock_type= target_tbl->lock_type;
/* We can assume that tables to be deleted from are locked for write. */
DBUG_ASSERT(walk->lock_type >= TL_WRITE_ALLOW_WRITE);
DBUG_ASSERT(walk->lock_type >= TL_FIRST_WRITE);
walk->mdl_request.set_type(MDL_SHARED_WRITE);
target_tbl->correspondent_table= walk; // Remember corresponding table
}