I tried to grow my LVM (on luks) root partition with
lvresize -L +5G -r /dev/vg/lv-root
and found that the file system wouldn't grow because it was mounted. Now I found this
that says I should boot from something else, and do
resize2fs /dev/vg/lv-root <size>
My question is: can I omit the size and just let the filesystem fill the partition (which was successfully enlarged before)? I'd try it but afraid of messing things up. Using (up to date) Arch and the filesystem is ext4.