etc/systemd/system/zfs-volume-wait.service.in

   1 [Unit]
   2 Description=Wait for ZFS Volume (zvol) links in /dev
   3 DefaultDependencies=no
   4 After=systemd-udev-settle.service
   5 After=zfs-import.target
   6
   7 [Service]
   8 Type=oneshot
   9 RemainAfterExit=yes
  10 ExecStart=@bindir@/zvol_wait
  11
  12 [Install]
  13 WantedBy=zfs-volumes.target