*** lilo-org/bsect.c	Tue May 21 00:14:50 1996
--- lilo/bsect.c	Sun Mar 23 20:47:00 1997
***************
*** 418,423 ****
--- 418,468 ----
      }
  }
  
+ #define BENICEWITHNT
+ 
+ /* ugly patch from Cyrille Chepelov <chepelov@rip.ens-cachan.fr>
+  
+    no guarantee at all ! it does, however, solve the problem of preserving
+   NT disks IDs (and thus stripe set ownership) on *my* machine. There is
+ no guarantee of its correct behavior on other ones. You have been warned.
+ 
+ comments welcome, send flames and lawyers to /dev/null.
+ */
+ 
+ void BeNiceWithNT(void)
+ {
+   /* Windows NT's disk ID seems to be at offset 0x1b8 of the MBR
+  (it may be somewhere else in the case of extended partitions, 
+ but I would really doubt it)
+ 
+    To prevent LILO from splitting up FT disk sets, and to prevent
+ Disk Administrator from complaining about lost disk IDs in 
+  general, we will brutally copy the 4 bytes at offset 0x1b8 from
+ the original boot sector to the new one.
+ 
+ Of course, this is really needed only for MBRs. 
+ */
+ #ifdef BENICEWITHNT
+ #define DISKID_OFS (0x1b8)
+     char *diskID_orig = (char *)&bsect_orig + DISKID_OFS;
+     char *diskID_dest  = (char *)&bsect + DISKID_OFS;
+     unsigned long int diskID = 0;
+     diskID = *((unsigned long int *)diskID_orig);
+ 
+     if (*((unsigned long int *)diskID_dest))
+       {
+ printf("lilo warning : NT diskID field is already filled.\n");
+ printf("        resulting boot sector may be corrupt ! \n");
+       }
+ 
+     *((unsigned long int*)diskID_dest) = 
+                    *((unsigned long int*)diskID_orig);
+    
+ #endif BENICEWITHNT
+ }
+ 
+ 
+ /* end of C.Chepelov's ugly patch */
  
  void bsect_update(char *backup_file,int force_backup)
  {
***************
*** 443,448 ****
--- 488,494 ----
  	    die("creat %s: %s",backup_file,strerror(errno));
  	if (write(bck_file,(char *) &bsect_orig,SECTOR_SIZE) != SECTOR_SIZE)
  	    die("write %s: %s",backup_file,strerror(errno));
+         
  	if (verbose > 0)
  	    printf("Backup copy of boot sector in %s\n",backup_file);
  	if (fstat(bck_file,&st) < 0)
***************
*** 455,460 ****
--- 501,509 ----
  	die("lseek %s: %s",boot_devnam ? boot_devnam : dev.name,
  	  strerror(errno));
      if (verbose > 0) printf("Writing boot sector.\n");
+ 
+     BeNiceWithNT();
+ 
      if (write(fd,(char *) &bsect,SECTOR_SIZE) != SECTOR_SIZE)
  	die("write %s: %s",boot_devnam ? boot_devnam : dev.name,
  	  strerror(errno));
***************
*** 572,574 ****
--- 621,624 ----
  	}
      exit(0);
  }
+