qubes-doc/en/configuration/resize-root-disk-image.md

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Resizing root.img Size

The safest way to increase the size of root.img is to do it for a standalone VM (qvm-create --standalone) - which has its own root filesystem (copy of template, instead of smart sharing). But it should also work for a normal template (as long as changes in the template between reboots didn't exceed 10G).

Replace the size and the path (name) of the template as wished and run your modified command:

truncate -s 20G /var/lib/qubes/vm-templates/fedora-21/root.img

Then start your template or standalone VM and run:

sudo resize2fs /dev/mapper/dmroot

after that shutdown the template.

Then you should have extended root.img in your VM/template