Greatly simplify the role since most things are the same cross-platform.

handlers/main.yml

@@ -1,3 +1,3 @@
 ---
-- name: restart nfs server
+- name: restart nfs
   service: "name={{ nfs_server_daemon }} state=restarted"

tasks/configure-Debian.yml

@@ -1,4 +0,0 @@
----
-- name: Ensure NFS is running.
-  service: name=nfs-kernel-server state=started enabled=yes
-  when: nfs_exports

tasks/configure-RedHat.yml

@@ -1,7 +0,0 @@
----
-- name: Ensure rpcbind and nfs are running.
-  service: "name={{ item }} state=started enabled=yes"
-  with_items:
-    - rpcbind
-    - nfs
-  when: nfs_exports

tasks/main.yml

@@ -17,11 +17,12 @@
     owner: root
     group: root
     mode: 0644
-  notify: restart nfs server
+  notify: restart nfs
 
 # Configuration tasks.
-- include: configure-RedHat.yml
-  when: ansible_os_family == 'RedHat'
-
-- include: configure-Debian.yml
-  when: ansible_os_family == 'Debian'
+- name: Ensure rpcbind and nfs are running.
+  service: "name={{ item }} state=started enabled=yes"
+  with_items:
+    - rpcbind
+    - "{{ nfs_server_daemon }}"
+  when: nfs_exports|length

tasks/setup-Debian.yml

@@ -4,7 +4,3 @@
   with_items:
     - nfs-common
     - nfs-kernel-server
-
-# This isn't necessary until exports are configured in /etc/exports.
-# - name: Ensure NFS is running.
-#   service: name=nfs-kernel-server state=started enabled=yes

tasks/setup-RedHat.yml

@@ -1,10 +1,3 @@
 ---
 - name: Ensure NFS utilities are installed.
   yum: name=nfs-utils state=installed
-
-# This isn't necessary until exports are configured in /etc/exports.
-# - name: Ensure rpcbind and nfs are running.
-#   service: "name={{ item }} state=started enabled=yes"
-#   with_items:
-#     - rpcbind
-#     - nfs