diff -rup -X dontdiff linux/include/linux/reiserfs_fs.h linux.patched/include/linux/reiserfs_fs.h
--- linux/include/linux/reiserfs_fs.h	Mon Nov 19 15:14:16 2001
+++ linux.patched/include/linux/reiserfs_fs.h	Mon Nov 19 21:08:19 2001
@@ -236,9 +236,9 @@ typedef union {
     __u64 linear;
 } __attribute__ ((__packed__)) offset_v2_esafe_overlay;
 
-static inline __u16 offset_v2_k_type( struct offset_v2 *v2 )
+static inline __u16 offset_v2_k_type( const struct offset_v2 *v2 )
 {
-    offset_v2_esafe_overlay tmp = *(offset_v2_esafe_overlay *)v2;
+    offset_v2_esafe_overlay tmp = *(const offset_v2_esafe_overlay *)v2;
     tmp.linear = le64_to_cpu( tmp.linear );
     return tmp.offset_v2.k_type;
 }
@@ -251,9 +251,9 @@ static inline void set_offset_v2_k_type(
     tmp->linear = le64_to_cpu(tmp->linear);
 }
  
-static inline loff_t offset_v2_k_offset( struct offset_v2 *v2 )
+static inline loff_t offset_v2_k_offset( const struct offset_v2 *v2 )
 {
-    offset_v2_esafe_overlay tmp = *(offset_v2_esafe_overlay *)v2;
+    offset_v2_esafe_overlay tmp = *(const offset_v2_esafe_overlay *)v2;
     tmp.linear = le64_to_cpu( tmp.linear );
     return tmp.offset_v2.k_offset;
 }

.