struct statvfs {
        ulong_t    f_bsize;     /* preferred file system block size          */
        ulong_t    f_frsize;    /* fundamental file system block size        */
        fsblkcnt_t f_blocks;    /* total # of blocks of f_frsize in fs       */ 
        fsblkcnt_t f_bfree;     /* total # of free blocks                    */
        fsblkcnt_t f_bavail;    /* # of blocks available to non super user   */
        fsfilcnt_t f_files;     /* total # of file nodes (inode in JFS)      */
        fsfilcnt_t f_ffree;     /* total # of free file nodes                */
        fsfilcnt_t f_favail;    /* # of nodes available to non super user    */
#ifdef _ALL_SOURCE
        fsid_t     f_fsid;      /* file system id                            */
#else
        ulong_t    f_fsid;      /* file system id                            */
#ifndef __64BIT__
        ulong_t    f_fstype;    /* file system type                          */
#endif
#endif  /* _ALL_SOURCE */
        char       f_basetype[_FSTYPSIZ]; /* Filesystem type name (eg. jfs)  */
        ulong_t    f_flag;      /* bit mask of flags                         */
        ulong_t    f_namemax;   /* maximum filename length                   */
        char       f_fstr[32];  /* filesystem-specific string */
        ulong_t    f_filler[16];/* reserved for future use                   */
};