Use 'mount' instead of 'lineinfile'

playbooks/roles/swapfile/tasks/main.yml

@@ -23,7 +23,7 @@
   when: SWAPFILE_SIZE != false and create_swapfile.changed
 
 - name: Add swapfile to /etc/fstab
-  lineinfile: dest=/etc/fstab line="{{ SWAPFILE_LOCATION }}   none    swap    sw    0   0" state=present
+  mount: name=none src="{{ SWAPFILE_LOCATION }}" fstype=swap opts=sw passno=0 dump=0 state=present
   when: SWAPFILE_SIZE != false
 
 - name: Configure vm.swappiness