EXT2_SB_MAGIC_OFFSET 620 fs/ext2/ext2.h A(EXT2_SB_MAGIC_OFFSET, s_magic); EXT2_SB_MAGIC_OFFSET 37 include/linux/ext2_fs.h if (*(__le16 *)(p + EXT2_SB_MAGIC_OFFSET) != cpu_to_le16(EXT2_SUPER_MAGIC))