FS not resizing.

[jakenl]

I moved my SD-card to the USB stick on a RPI 2b device. This works fine. However, the root partiion doesn't want to resize to the size of the USB stick. xbian-config doesn't support the resize, since it is supposed to resize by itself.

How can I make it resize?
(I checked some old forum topics, and I checked my /boot/config.txt The following lines look different than in those forums:

Code:

# see /etc/default/xbian-initramfs
#initramfs initramfs.gz  followkernel