EXT4_SUPER_MAGIC
if (sb->s_magic != EXT4_SUPER_MAGIC) {
if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
buf->f_type = EXT4_SUPER_MAGIC;
case EXT4_SUPER_MAGIC: