Cinder-backup fails while backing up iSCSI volumes

Cinder backup needs access to the same volumes as
cinder volume service when saving/restoring iSCSI disks

Change-Id: Ib1956cbd57e8959bad520b8d4c6d792a449ecf22
Closes-Bug: #1614460

ansible/roles/cinder/tasks/start.yml

@@ -23,9 +23,9 @@
       - "kolla_logs:/var/log/kolla/"
   when: inventory_hostname in groups['cinder-scheduler']
 
-- name: Prepare volumes list
+- name: Prepare volumes list for cinder-volume
   set_fact:
-     mounts:
+     cinder_volume_mounts:
       - "{{ node_config_directory }}/cinder-volume/:{{ container_config_directory }}/:ro"
       - "/etc/localtime:/etc/localtime:ro"
       - "/dev/:/dev/"
@@ -42,9 +42,20 @@
     image: "{{ cinder_volume_image_full }}"
     privileged: True
     ipc_mode: "host"
-    volumes: '{{ mounts | reject("equalto", "") | list}}'
+    volumes: '{{ cinder_volume_mounts | reject("equalto", "") | list}}'
   when: inventory_hostname in groups['cinder-volume']
 
+- name: Prepare volumes list for cinder-backup
+  set_fact:
+     cinder_backup_mounts:
+      - "{{ node_config_directory }}/cinder-backup/:{{ container_config_directory }}/:ro"
+      - "/etc/localtime:/etc/localtime:ro"
+      - "/dev/:/dev/"
+      - "/run/:/run/"
+      - "{% if enable_cinder_backend_lvm | bool %}cinder:/var/lib/cinder{% endif %}"
+      - "{% if enable_cinder_backend_lvm | bool %}iscsi_info:/etc/iscsi{% endif %}"
+      - "kolla_logs:/var/log/kolla/"
+
 - name: Starting cinder-backup container
   kolla_docker:
     action: "start_container"
@@ -52,9 +63,5 @@
     name: "cinder_backup"
     image: "{{ cinder_backup_image_full }}"
     privileged: True
-    volumes:
-      - "{{ node_config_directory }}/cinder-backup/:{{ container_config_directory }}/:ro"
-      - "/etc/localtime:/etc/localtime:ro"
-      - "/dev/mapper/:/dev/mapper/"
-      - "kolla_logs:/var/log/kolla/"
+    volumes: '{{ cinder_backup_mounts | reject("equalto", "") | list}}'
   when: inventory_hostname in groups['cinder-backup']