text: #ifndef INODE_H
  #define INODE_H
  #include "constants.h"
  #include <time.h>
  struct Inode
  {
      int i_ino;
      int i_mode;
      int i_cnt;
      char i_uname[20];
      char i_gname[20];
      int i_size;
  
      time_t i_create_time;
      time_t i_last_open_time;
  
      int i_direct_block[10];
      int i_indirect_block;
  };
  int ialloc();
  bool ifree(int address);
  #endif
  