replaces usage of vfs_readdir with iterate_dir. origionally found here:
https://bugs.gentoo.org/show_bug.cgi?id=508204

diff -Naur vmblock-only/linux/file.c vmblock-only/linux/file.c
--- vmblock-only/linux/file.c	2013-11-05 23:33:26.000000000 -0500
+++ vmblock-only/linux/file.c	2014-04-26 10:58:03.062635343 -0400
@@ -166,11 +166,9 @@
 
 static int
 FileOpReaddir(struct file *file,  // IN
-              void *dirent,       // IN
-              filldir_t filldir)  // IN
+		struct dir_context *ctx)
 {
    int ret;
-   FilldirInfo info;
    struct file *actualFile;
 
    if (!file) {
@@ -184,11 +182,8 @@
       return -EINVAL;
    }
 
-   info.filldir = filldir;
-   info.dirent = dirent;
-
    actualFile->f_pos = file->f_pos;
-   ret = vfs_readdir(actualFile, Filldir, &info);
+   ret = iterate_dir(actualFile, ctx);
    file->f_pos = actualFile->f_pos;
 
    return ret;
@@ -237,7 +232,7 @@
 
 
 struct file_operations RootFileOps = {
-   .readdir = FileOpReaddir,
+   .iterate = FileOpReaddir,
    .open    = FileOpOpen,
    .release = FileOpRelease,
 };