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minix history - super_block

v1

http://download.minix3.org/previous-versions/Intel-1.1/floppy_disk6

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struct super_block {
  u16_t s_ninodes;      /* # usable inodes on the minor device */
  u16_t s_nzones;       /* total device size, including bit maps etc */
  u16_t s_imap_blocks;  /* # of blocks used by inode bit map */
  u16_t s_zmap_blocks;  /* # of blocks used by zone bit map */
  u16_t s_firstdatazone;    /* number of first data zone */
  u16_t s_log_zone_size;    /* log2 of blocks/zone */
  u32_t s_max_size;         /* maximum file size on this device */
  u16_t s_magic;            /* magic number to recognize super-blocks */
  ...
};

v2

https://www.minix3.org/previous-versions/Intel-2.0.0/src/SYS.TAZ

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struct super_block {
  u16_t s_ninodes;      /* # usable inodes on the minor device */
  u16_t s_nzones;       /* total device size, including bit maps etc */
  u16_t s_imap_blocks;      /* # of blocks used by inode bit map */
  u16_t s_zmap_blocks;      /* # of blocks used by zone bit map */
  u16_t s_firstdatazone;    /* number of first data zone */
  u16_t s_log_zone_size;    /* log2 of blocks/zone */
  u32_t s_max_size;     /* maximum file size on this device */
  u16_t s_magic;        /* magic number to recognize super-blocks */
  u16_t s_pad;          /* try to avoid compiler-dependent padding */
  u32_t s_zones;        /* number of zones (replaces s_nzones in V2) */
  ...
};

v3

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struct super_block {
  u32_t s_ninodes;      /* # usable inodes on the minor device */
  u16_t s_nzones;       /* total device size, including bit maps etc */
  u16_t s_imap_blocks;  /* # of blocks used by inode bit map */
  u16_t s_zmap_blocks;  /* # of blocks used by zone bit map */
  u16_t s_firstdatazone_old;    /* number of first data zone (small) */
  u16_t s_log_zone_size;    /* log2 of blocks/zone */
  u16_t s_flags;        /* FS state flags */
  u32_t s_max_size;     /* maximum file size on this device */
  u32_t s_zones;        /* number of zones (replaces s_nzones in V2) */
  u16_t s_magic;        /* magic number to recognize super-blocks */
  u16_t s_pad2;         /* try to avoid compiler-dependent padding */
  u16_t s_block_size;   /* block size in bytes. */
  u8_t  s_disk_version; /* filesystem format sub-version */
  ...
};

源码篇

v1

官方提供源码位于 http://download.minix3.org/previous-versions/Intel-1.1

从 README 可知 文件系统源码位于 floppy_disk6

挂载即可:

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sudo mount -o loop -t minix floppy_disk6 /mnt

当然你不介意的话 vi 打开也行 (/・・)ノ

相邻版本 diff

v1 -> v2

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@@ struct super_block @@
   u16_t s_log_zone_size;
   u32_t s_max_size;
   u16_t s_magic;
+  u16_t s_pad;
+  u32_t s_zones;
   ...

可以看到 v2 向下兼容 v1

v2 -> v3

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@@ struct super_block @@
-  u16_t s_ninodes;
+  u32_t s_ninodes;
   u16_t s_nzones;
   u16_t s_imap_blocks;
   u16_t s_zmap_blocks;
-  u16_t s_firstdatazone;
+  u16_t s_firstdatazone_old;
   u16_t s_log_zone_size;
-  u32_t s_max_size;
-  u16_t s_magic;
-  u16_t s_pad;
+  u16_t s_flags;
+  u32_t s_max_size;
   u32_t s_zones;
+  u16_t s_magic;
   ...

这个修改就比较大了, 这还是 minix v2 吗...