grub2-probe can't find a subvolume? [solved]

[reub2000]

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grub2-mkconfig -o /boot/grub/grub.cfg
/usr/sbin/grub2-probe: error: cannot find a device for / (is /dev mounted?).

/ is on a subvolume of /dev/sda2. I can see /dev/sda2 from within the chroot, so I don't know why it claims it can't find the device.

Edit: It doesn't work from the chroot. But I was able to edit grub.cfg by hand, and it works now.