diff --git a/innobase/os/os0file.c b/innobase/os/os0file.c
index b09c48319c3..6ed3720cc84 100644
--- a/innobase/os/os0file.c
+++ b/innobase/os/os0file.c
@@ -1186,7 +1186,7 @@ os_file_pread(
 	os_file_n_pending_preads++;
         os_mutex_exit(os_file_count_mutex);
 
-        n_bytes = pread(file, buf, n, offs);
+        n_bytes = pread(file, buf, (ssize_t)n, offs);
 
         os_mutex_enter(os_file_count_mutex);
 	os_file_n_pending_preads--;
@@ -1211,7 +1211,7 @@ os_file_pread(
 		return(ret);
 	}
 	
-	ret = read(file, buf, n);
+	ret = read(file, buf, (ssize_t)n);
 
 	os_mutex_exit(os_file_seek_mutexes[i]);
 
@@ -1261,7 +1261,7 @@ os_file_pwrite(
 	os_file_n_pending_pwrites++;
         os_mutex_exit(os_file_count_mutex);
 
-	ret = pwrite(file, buf, n, offs);
+	ret = pwrite(file, buf, (ssize_t)n, offs);
 
         os_mutex_enter(os_file_count_mutex);
 	os_file_n_pending_pwrites--;
@@ -1296,7 +1296,7 @@ os_file_pwrite(
 		return(ret);
 	}
 	
-	ret = write(file, buf, n);
+	ret = write(file, buf, (ssize_t)n);
 
 	if (srv_unix_file_flush_method != SRV_UNIX_LITTLESYNC
 	    && srv_unix_file_flush_method != SRV_UNIX_NOSYNC
diff --git a/innobase/row/row0ins.c b/innobase/row/row0ins.c
index 458970da4e2..b9f860903cb 100644
--- a/innobase/row/row0ins.c
+++ b/innobase/row/row0ins.c
@@ -966,6 +966,23 @@ row_ins_foreign_check_on_constraint(
 	
 	err = row_update_cascade_for_mysql(thr, cascade,
 						foreign->foreign_table);
+
+	if (foreign->foreign_table->n_foreign_key_checks_running == 0) {
+		fprintf(stderr,
+"InnoDB: error: table %s has the counter 0 though there is\n"
+"InnoDB: a FOREIGN KEY check running on it.\n",
+			foreign->foreign_table->name);
+	}
+
+	/* Release the data dictionary latch for a while, so that we do not
+	starve other threads from doing CREATE TABLE etc. if we have a huge
+	cascaded operation running. The counter n_foreign_key_checks_running
+	will prevent other users from dropping or ALTERing the table when we
+	release the latch. */
+
+	row_mysql_unfreeze_data_dictionary(thr_get_trx(thr));
+	row_mysql_freeze_data_dictionary(thr_get_trx(thr));
+
 	mtr_start(mtr);
 
 	/* Restore pcur position */
diff --git a/innobase/row/row0mysql.c b/innobase/row/row0mysql.c
index a884dc8d9ef..3eb4f0de60e 100644
--- a/innobase/row/row0mysql.c
+++ b/innobase/row/row0mysql.c
@@ -2156,8 +2156,8 @@ row_drop_table_for_mysql(
 		fputs("	 InnoDB: You are trying to drop table ", stderr);
 		ut_print_name(stderr, table->name);
 		fputs("\n"
-		  "InnoDB: though there are foreign key check running on it.\n"
-		  "InnoDB: Adding the table to the background drop queue.\n",
+		 "InnoDB: though there is a foreign key check running on it.\n"
+		 "InnoDB: Adding the table to the background drop queue.\n",
 			stderr);
 
 		row_add_table_to_background_drop_list(table);
diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc
index 9e0853a370b..7c21a5af2a6 100644
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -1142,7 +1142,9 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
       if (check_access(thd,CREATE_ACL,db,0,1))
 	break;
       mysql_log.write(thd,command,packet);
-      mysql_create_db(thd,(lower_case_table_names == 2 ? alias : db),0,0);
+      if (mysql_create_db(thd, (lower_case_table_names == 2 ? alias : db),
+                          0, 0) < 0)
+        send_error(&thd->net, thd->killed ? ER_SERVER_SHUTDOWN : 0);
       break;
     }
   case COM_DROP_DB:				// QQ: To be removed
@@ -1163,7 +1165,9 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
 	break;
       }
       mysql_log.write(thd,command,db);
-      mysql_rm_db(thd, (lower_case_table_names == 2 ? alias : db), 0, 0);
+      if (mysql_rm_db(thd, (lower_case_table_names == 2 ? alias : db),
+                      0, 0) < 0)
+        send_error(&thd->net, thd->killed ? ER_SERVER_SHUTDOWN : 0);
       break;
     }
   case COM_BINLOG_DUMP: