struct ext4_group_desc * gd
int s_addr_per_block_bits
struct ext3_super_block * s_es
unsigned long s_itb_per_group
unsigned long s_desc_size
unsigned long s_desc_per_block
unsigned long s_inodes_per_group
unsigned long s_gdb_count
unsigned long s_inodes_per_block
unsigned long s_groups_count
unsigned long s_blocks_per_group
int s_desc_per_block_bits