DEBUGFS_MAGIC
err = simple_fill_super(sb, DEBUGFS_MAGIC, debug_files);
{.action = DONT_MEASURE, .fsmagic = DEBUGFS_MAGIC, .flags = IMA_FSMAGIC},
{.action = DONT_APPRAISE, .fsmagic = DEBUGFS_MAGIC, .flags = IMA_FSMAGIC},
#ifndef DEBUGFS_MAGIC