common: disk_maintenance.fstrim_mountpoints limits fstrim.service to the listed mountpoints

common/defaults/main.yml

@@ -8,6 +8,8 @@ ipv6_accept_ra_interfaces: []
 disk_maintenance:
   # systemd OnCalendar for fstrim.timer; unset keeps the distribution schedule.
   fstrim_on_calendar:
+  # Mountpoints fstrim.service trims; unset trims every fstab filesystem.
+  fstrim_mountpoints:
   # Cron "minute hour" of the monthly ZFS trim and scrub from zfsutils-linux; unset keeps 00:24.
   zfs_cron_time:
 

common/tasks/disk_maintenance.yml

@@ -25,6 +25,36 @@
         daemon_reload: yes
         state: restarted
 
+- name: Create the fstrim service drop-in directory
+  when: disk_maintenance.fstrim_mountpoints | default(none) is not none
+  file:
+    path: /etc/systemd/system/fstrim.service.d
+    state: directory
+
+- name: Set the fstrim mountpoints
+  when: disk_maintenance.fstrim_mountpoints | default(none) is not none
+  copy:
+    dest: /etc/systemd/system/fstrim.service.d/mountpoints.conf
+    content: |
+      [Service]
+      ExecStart=
+      {% for m in disk_maintenance.fstrim_mountpoints %}
+      ExecStart=/sbin/fstrim --verbose --quiet-unsupported {{ m }}
+      {% endfor %}
+  register: fstrim_mountpoints
+
+- name: Trim every fstab filesystem
+  when: disk_maintenance.fstrim_mountpoints | default(none) is none
+  file:
+    path: /etc/systemd/system/fstrim.service.d/mountpoints.conf
+    state: absent
+  register: fstrim_mountpoints_removed
+
+- name: Reload systemd for the fstrim mountpoints
+  when: fstrim_mountpoints.changed or fstrim_mountpoints_removed.changed
+  systemd:
+    daemon_reload: yes
+
 - name: Schedule the monthly ZFS trim and scrub
   when: disk_maintenance.zfs_cron_time | default(none) is not none
   lineinfile: