BINFMTFS_MAGIC
err = simple_fill_super(sb, BINFMTFS_MAGIC, bm_files);
{.action = DONT_MEASURE, .fsmagic = BINFMTFS_MAGIC, .flags = IMA_FSMAGIC},
{.action = DONT_APPRAISE, .fsmagic = BINFMTFS_MAGIC, .flags = IMA_FSMAGIC},