Add creat function call. Fix direntry iteration in EXT2. Fix open of directories in EXT2. Fix re-utilization of unlinked direntries in EXT2.

mentos/src/kernel.c

@@ -350,6 +350,8 @@ int kmain(boot_info_t *boot_informations)
     }
     print_ok();
 
+    //ext2_test();
+
     // We have completed the booting procedure.
     pr_notice("Booting done, jumping into init process.\n");
     // Print the welcome message.