ext2_bg_has_super
return ext2_bg_has_super(sb, group) ? EXT2_SB(sb)->s_gdb_count : 0;
extern int ext2_bg_has_super(struct super_block *sb, int group);
overhead += ext2_bg_has_super(sb, i) +
return ext2_group_first_block_no(sb, bg) + ext2_bg_has_super(sb, bg);