2.9BSD - /usr/src/cmd/v6/filsys.h

   1: /* Structure of the version 6 super-block	*/
   2: struct  filsys {
   3:     int isize;  /* size in blocks of i-list */
   4:     int fsize;      /* size in blocks of entire volume */
   5:     int     nfree;      /* number of addresses in free */
   6:     int free[100];  /* free block list */
   7:     int     ninode;     /* number of i-nodes in inode */
   8:     int     finode[100];    /* free i-node list */
   9:     char    flock;      /* lock during free list manipulation */
  10:     char    ilock;      /* lock during i-list manipulation */
  11:     char    fmod;       /* super block modified flag */
  12:     int     time[2];        /* last super block update */
  13: };

Defined struct's

Usage of this include