[PATCH] kNFSd: new routine fh_dup2()

Define fh_dup2(), which copies a _verified_ filehandle, taking care
of refcounts accordingly.  (This will be used by RESTOREFH/SAVEFH and
a few other places.)

include/linux/nfsd/nfsfh.h

@@ -251,6 +251,14 @@ fh_copy(struct svc_fh *dst, struct svc_fh *src)
 	return dst;
 }
 
+static __inline__ void
+fh_dup2(struct svc_fh *dst, struct svc_fh *src)
+{
+	fh_put(dst);
+	dget(src->fh_dentry);
+	*dst = *src;
+}
+
 static __inline__ struct svc_fh *
 fh_init(struct svc_fh *fhp, int maxsize)
 {