usr/lib/systemd/system/resize2fs@.service

   1 [Unit]
   2 Description=Resize of File System on %f
   3 DefaultDependencies=no
   4 BindTo=%i.device
   5 After=fsck@%i.service
   6 Requires=fsck@%i.service
   7 Before=local-fs.target shutdown.target
   8
   9 [Service]
  10 Type=oneshot
  11 RemainAfterExit=no
  12 ExecStart=/sbin/resize2fs %f
  13 StandardOutput=journal+console
  14 TimeoutSec=0