/**
* ext4_bg_num_gdb - number of blocks used by the group table in group
* @sb: superblock for filesystem
* @group: group number to check
*
* Return the number of blocks used by the group descriptor table
* (primary or backup) in this group. In the future there may be a
* different number of descriptor blocks in each group.
*/
unsigned long ext4_bg_num_gdb(struct super_block *sb, ext4_group_t group)
{
unsigned long first_meta_bg =
le32_to_cpu(EXT4_SB(sb)->s_es->s_first_meta_bg);
unsigned long metagroup = group / EXT4_DESC_PER_BLOCK(sb);
if (!EXT4_HAS_INCOMPAT_FEATURE(sb,EXT4_FEATURE_INCOMPAT_META_BG) ||
metagroup < first_meta_bg)
return ext4_bg_num_gdb_nometa(sb, group);
return ext4_bg_num_gdb_meta(sb,group);
}
uint32_t ext4_bg_num_gdb(struct ext4_sblock *s, uint32_t group)
{
uint32_t dsc_per_block =
ext4_sb_get_block_size(s) / ext4_sb_get_desc_size(s);
uint32_t first_meta_bg = ext4_sb_first_meta_bg(s);
uint32_t metagroup = group / dsc_per_block;
if (!ext4_sb_feature_incom(s,EXT4_FINCOM_META_BG) ||
metagroup < first_meta_bg)
return ext4_bg_num_gdb_nometa(s, group);
return ext4_bg_num_gdb_meta(s, group);
}
