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minix history - inode

v1

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struct inode {
  u16_t i_mode;     /* file type, protection, etc. */
  u16_t i_uid;      /* user id of the file's owner */
  u32_t i_size;     /* current file size in bytes */
  i32_t i_modtime;  /* when was file data last changed */
  u8_t i_gid;       /* group number */
  u8_t i_nlinks;    /* how many links to this file */
  u16_t i_zone[9];  /* zone numbers for direct, ind, and dbl ind */
  ...
};

v2

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struct inode {
  u16_t i_mode;     /* file type, protection, etc. */
  u8_t  i_nlinks;   /* how many links to this file */
  u16_t i_uid;      /* user id of the file's owner */
  u8_t  i_gid;      /* group number */
  u32_t i_size;     /* current file size in bytes */
  u32_t i_atime;    /* time of last access (V2 only) */
  u32_t i_mtime;    /* when was file data last changed */
  u32_t i_ctime;    /* when was inode itself changed (V2 only)*/
  u32_t i_zone[10]; /* zone numbers for direct, ind, and dbl ind */
  ...
};

v3

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struct inode {
  u16_t i_mode;     /* file type, protection, etc. */
  u16_t i_nlinks    /* how many links to this file */
  u16_t i_uid;      /* user id of the file's owner */
  u16_t i_gid;      /* group number */
  u32_t i_size;     /* current file size in bytes */
  u32_t i_atime;    /* time of last access (V2 only) */
  u32_t i_mtime;    /* when was file data last changed */
  u32_t i_ctime;    /* when was inode itself changed (V2 only)*/
  u32_t i_zone[10]; /* zone numbers for direct, ind, and dbl ind */
  ...
};

diff

意义不大, v2 对齐之后就是 v3, v1 与这两个都大相径庭