File grub-1.98-follow-dev-mapper-symlinks.patch of Package grub2

--- a/util/getroot.c	2010-03-06 20:51:37.000000000 +0000
+++ b/util/getroot.c	2010-05-28 18:23:19.892788564 +0100
@@ -180,7 +180,8 @@ grub_get_prefix (const char *dir)
 
 static char *
 find_root_device (const char *dir __attribute__ ((unused)),
-                  dev_t dev __attribute__ ((unused)))
+                  dev_t dev __attribute__ ((unused))
+                  int depth __attribute__ ((unused)))
 {
   return 0;
 }
@@ -188,7 +189,7 @@ find_root_device (const char *dir __attr
 #elif ! defined(__CYGWIN__)
 
 static char *
-find_root_device (const char *dir, dev_t dev)
+find_root_device (const char *dir, dev_t dev, int depth)
 {
   DIR *dp;
   char *saved_cwd;
@@ -222,16 +223,27 @@ find_root_device (const char *dir, dev_t
 	/* Ignore any error.  */
 	continue;
 
-      if (S_ISLNK (st.st_mode))
+      if (S_ISLNK (st.st_mode)) {
+#ifdef __linux__
+	/* If we're in /dev/mapper, follow symbolic links. */
+	if (depth == 1 && strcmp(dir, "mapper") == 0) {
+		if (stat(ent->d_name, &st) == -1)
+		  continue;
+		if (S_ISDIR (st.st_mode))
+		  continue;
+	}
+#else
 	/* Don't follow symbolic links.  */
 	continue;
+#endif
+      }
 
       if (S_ISDIR (st.st_mode))
 	{
 	  /* Find it recursively.  */
 	  char *res;
 
-	  res = find_root_device (ent->d_name, dev);
+	  res = find_root_device (ent->d_name, dev, depth + 1);
 
 	  if (res)
 	    {
@@ -454,7 +466,7 @@ grub_guess_root_device (const char *dir)
 #else
 
   /* This might be truly slow, but is there any better way?  */
-  os_dev = find_root_device ("/dev", st.st_dev);
+  os_dev = find_root_device ("/dev", st.st_dev, 0);
 #endif
 #endif /* !__GNU__ */