simply remove the code for Filldir since it is no longer used with the new 
iterate_dir API

diff -rupN vmblock-only/linux/file.c vmblock-only.new/linux/file.c
--- vmblock-only/linux/file.c	2014-10-07 23:22:46.832469618 -0400
+++ vmblock-only.new/linux/file.c	2014-10-07 23:24:35.276472720 -0400
@@ -38,46 +38,6 @@ typedef u64 inode_num_t;
 typedef ino_t inode_num_t;
 #endif
 
-/* Specifically for our filldir_t callback */
-typedef struct FilldirInfo {
-   filldir_t filldir;
-   void *dirent;
-} FilldirInfo;
-
-
-/*
- *----------------------------------------------------------------------------
- *
- * Filldir --
- *
- *    Callback function for readdir that we use in place of the one provided.
- *    This allows us to specify that each dentry is a symlink, but pass through
- *    everything else to the original filldir function.
- *
- * Results:
- *    Original filldir's return value.
- *
- * Side effects:
- *    Directory information gets copied to user's buffer.
- *
- *----------------------------------------------------------------------------
- */
-
-static int
-Filldir(void *buf,              // IN: Dirent buffer passed from FileOpReaddir
-        const char *name,       // IN: Dirent name
-        int namelen,            // IN: len of dirent's name
-        loff_t offset,          // IN: Offset
-        inode_num_t ino,        // IN: Inode number of dirent
-        unsigned int d_type)    // IN: Type of file
-{
-   FilldirInfo *info = buf;
-
-   /* Specify DT_LNK regardless */
-   return info->filldir(info->dirent, name, namelen, offset, ino, DT_LNK);
-}
-
-
 /* File operations */
 
 /*