I wonder if it is any way to run `trimfs` on rbd image which is currently
used by the KVM process? (when I don't have access to VM)

I know that I can do this by qemu-guest-agent but not all VMs have it

I can't use rbdmap too, because most images don't have distributed
filesystems. It's mostly ext4/xfs so I can't mount them in two places at
same time.

I would be grateful for any help.
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