EXT4_QUOTA_DEL_BLOCKS
#define EXT4_MAXQUOTAS_DEL_BLOCKS(sb) (EXT4_MAXQUOTAS*EXT4_QUOTA_DEL_BLOCKS(sb))
EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));