From de3381459ba56cd3b29d436ea024b716c1e3f2fb Mon Sep 17 00:00:00 2001
From: unknown <sasha@mysql.sashanet.com>
Date: Tue, 19 Sep 2000 16:17:19 -0600
Subject: [PATCH]  added reopen_name_locked_table() changed RESTORE TABLE to
 use name lock

sql/mysql_priv.h:
  added reopen_name_locked_table()
sql/sql_base.cc:
  added reopen_name_locked_table()
sql/sql_table.cc:
  fixed repare_for_restore() to use fn_format() power
  changed RESTORE TABLE to use name lock
---
 sql/mysql_priv.h |  1 +
 sql/sql_base.cc  | 41 +++++++++++++++++++++++++++++++++++++++++
 sql/sql_table.cc | 32 ++++++++++++++++++++------------
 3 files changed, 62 insertions(+), 12 deletions(-)

diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h
index 2bf1a8f9305..f74dd0f281c 100644
--- a/sql/mysql_priv.h
+++ b/sql/mysql_priv.h
@@ -328,6 +328,7 @@ int mysql_delete(THD *thd,TABLE_LIST *table,COND *conds,ha_rows rows,
 TABLE *open_ltable(THD *thd, TABLE_LIST *table_list, thr_lock_type update);
 TABLE *open_table(THD *thd,const char *db,const char *table,const char *alias,
 		  bool *refresh);
+TABLE *reopen_name_locked_table(THD* thd, TABLE_LIST* table);
 TABLE *find_locked_table(THD *thd, const char *db,const char *table_name);
 bool reopen_table(TABLE *table,bool locked=0);
 bool reopen_tables(THD *thd,bool get_locks,bool in_refresh);
diff --git a/sql/sql_base.cc b/sql/sql_base.cc
index a37506bcbf4..e5f8981d174 100644
--- a/sql/sql_base.cc
+++ b/sql/sql_base.cc
@@ -841,6 +841,47 @@ void wait_for_refresh(THD *thd)
   pthread_mutex_unlock(&thd->mysys_var->mutex);
 }
 
+TABLE *reopen_name_locked_table(THD* thd, TABLE_LIST* table_list)
+{
+  DBUG_ENTER("reopen_name_locked_table");
+  if (thd->killed)
+    DBUG_RETURN(0);
+  TABLE* table;
+  if(!(table = table_list->table))
+    DBUG_RETURN(0);
+
+  char* db = thd->db ? thd->db : table_list->db;
+  char* table_name = table_list->name;
+  char	key[MAX_DBKEY_LENGTH];
+  uint	key_length;
+  key_length=(uint) (strmov(strmov(key,db)+1,table_name)-key)+1;
+
+  pthread_mutex_lock(&LOCK_open);
+  if(open_unireg_entry(table, db, table_name, table_name) ||
+     !(table->table_cache_key =memdup_root(&table->mem_root,(char*) key,
+					     key_length)))
+    {
+      pthread_mutex_unlock(&LOCK_open);
+      DBUG_RETURN(0);
+    }
+  
+  table->key_length=key_length;
+  table->version=refresh_version;
+  table->flush_version=flush_version;
+  if (!key_cache_inited)
+    ha_key_cache();
+  table->in_use = thd;
+  check_unused();
+  pthread_mutex_unlock(&LOCK_open);
+  table->tablenr=thd->current_tablenr++;
+  table->used_fields=0;
+  table->const_table=0;
+  table->outer_join=table->null_row=table->maybe_null=0;
+  table->status=STATUS_NO_RECORD;
+  table->keys_in_use_for_query=table->used_keys= table->keys_in_use;
+  DBUG_RETURN(table);  
+}
+
 
 /******************************************************************************
 ** open a table
diff --git a/sql/sql_table.cc b/sql/sql_table.cc
index fa309a85bc5..19973ffd77b 100644
--- a/sql/sql_table.cc
+++ b/sql/sql_table.cc
@@ -755,24 +755,32 @@ static int prepare_for_restore(THD* thd, TABLE_LIST* table)
     {
       char* backup_dir = thd->lex.backup_dir;
       char src_path[FN_REFLEN], dst_path[FN_REFLEN];
-      int backup_dir_len = strlen(backup_dir);
       char* table_name = table->name;
-      int table_name_len = strlen(table_name);
       char* db = thd->db ? thd->db : table->db;
 	
-      if(backup_dir_len + table_name_len + 4 >= FN_REFLEN)
+      if(!fn_format(src_path, table_name, backup_dir, reg_ext, 4 + 64))
 	return -1; // protect buffer overflow
 	    
-      memcpy(src_path, backup_dir, backup_dir_len);
-      char* p = src_path + backup_dir_len;
-      *p++ = '/';
-      memcpy(p, table_name, table_name_len);
-      p += table_name_len;
-      *p = 0;
       sprintf(dst_path, "%s/%s/%s", mysql_real_data_home, db, table_name);
 
-      if(my_copy(fn_format(src_path, src_path, "", reg_ext, 4),
-		 fn_format(dst_path, dst_path, "", reg_ext, 4),
+      int lock_retcode;
+      pthread_mutex_lock(&LOCK_open);
+      if((lock_retcode = lock_table_name(thd, table)) < 0)
+	{
+	  pthread_mutex_unlock(&LOCK_open);
+	  return -1;
+	}
+      
+      if(lock_retcode && wait_for_locked_table_names(thd, table))
+	{
+          pthread_mutex_unlock(&LOCK_open);
+	  return -1;
+	}
+      pthread_mutex_unlock(&LOCK_open);
+      
+      if(my_copy(src_path,
+		 fn_format(dst_path, dst_path,"",
+			   reg_ext, 4),
 		 MYF(MY_WME)))
 	{
            return send_check_errmsg(thd, table, "restore",
@@ -840,7 +848,7 @@ static int mysql_admin_table(THD* thd, TABLE_LIST* tables,
 
 	// now we should be able to open the partially restored table
 	// to finish the restore in the handler later on
-	table->table = open_ltable(thd, table, lock_type);
+	table->table = reopen_name_locked_table(thd, table);
       }
     
     if (!table->table)