mkfs.minix: add support for mkfs3

index 638565e..8952792 100644
@@ -44,6 +44,24 @@ struct minix_super_block {
         u32 s_zones;
 };
 
+/* V3 minix super-block data on disk */
+struct minix3_super_block {
+	u32 s_ninodes;
+	u16 s_pad0;
+	u16 s_imap_blocks;
+	u16 s_zmap_blocks;
+	u16 s_firstdatazone;
+	u16 s_log_zone_size;
+	u16 s_pad1;
+	u32 s_max_size;
+	u32 s_zones;
+	u16 s_magic;
+	u16 s_pad2;
+	u16 s_blocksize;
+	u8  s_disk_version;
+        u16 s_state;
+};
+
 #define BLOCK_SIZE_BITS 10
 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
 

@@ -59,5 +77,6 @@ struct minix_super_block {
 #define MINIX_SUPER_MAGIC2   0x138F          /* minix fs, 30 char names */
 #define MINIX2_SUPER_MAGIC   0x2468	     /* minix V2 fs */
 #define MINIX2_SUPER_MAGIC2  0x2478	     /* minix V2 fs, 30 char names */
+#define MINIX3_SUPER_MAGIC   0x4d5a	     /* minix V3 fs (60 char names) */
 
 #endif /* KERNEL_INCLUDES_ARE_CLEAN */