There is an level of abstrxtion in the newre API as of 3.19 here
--- a/vmnet-only/driver.c	2015-02-07 03:54:17.000000000 +0300
+++ c/vmnet-only/driver.c	2015-02-24 03:58:06.043605137 +0300
@@ -1191,8 +1191,8 @@
    struct inode *inode = NULL;
    long err;

-   if (filp && filp->f_dentry) {
-      inode = filp->f_dentry->d_inode;
+   if (filp && filp->f_path.dentry) {
+      inode = filp->f_path.dentry->d_inode;
    }
    err = VNetFileOpIoctl(inode, filp, iocmd, ioarg);
    return err;