starting with kernel 3.6, d_revalidate takes an unsigned int "flags"
as the second argument, not a nameidata pointer! see fs/namei.c 
for implementation. Also changing vfs_follow_link to nd_set_link.
See: https://lkml.org/lkml/2013/9/9/236

diff -Naur vmblock-only/linux/inode.c vmblock-only/linux/inode.c
--- vmblock-only/linux/inode.c	2013-11-05 23:33:26.000000000 -0500
+++ vmblock-only/linux/inode.c	2014-04-26 10:58:03.063635343 -0400
@@ -36,7 +36,7 @@
 
 /* Inode operations */
 static struct dentry *InodeOpLookup(struct inode *dir,
-                                    struct dentry *dentry, struct nameidata *nd);
+                                    struct dentry *dentry, unsigned int flags);
 static int InodeOpReadlink(struct dentry *dentry, char __user *buffer, int buflen);
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 13)
 static void *InodeOpFollowlink(struct dentry *dentry, struct nameidata *nd);
@@ -75,7 +75,7 @@
 static struct dentry *
 InodeOpLookup(struct inode *dir,      // IN: parent directory's inode
               struct dentry *dentry,  // IN: dentry to lookup
-              struct nameidata *nd)   // IN: lookup intent and information
+              unsigned int flags)   // IN: lookup intent and information
 {
    char *filename;
    struct inode *inode;
@@ -221,7 +221,8 @@
       goto out;
    }
 
-   ret = vfs_follow_link(nd, iinfo->name);
+   nd_set_link(nd, iinfo->name);
+   ret = 0;
 
 out:
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 13)