Is it safe to use the zerofree utility on an ext4 partition inside an LVM with guestfish? I know zerofree works on ext4, but I am unsure about LVM. The info page uses the syntax “zerofree <device>”, so using the info page example, could I (safely) do something like the following?
Welcome to guestfish, the libguestfs filesystem interactive shell for
editing virtual machine filesystems.
Type: 'help' for a list of commands
'man' to read the manual
'quit' to quit the shell
><fs> add disk.img
><fs> zerofree /dev/vg_guest/lv_root
Thanks for any light you can shed on this.