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If LVM is not used when creating domU operating system, you might need to resize you image file. It's not easier than LVM but hopefully there's a solution.

• First create an extra image with the desired size (here 1GB) that will be added to the current image

$ dd if=/dev/zero of=extra.img bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 5.09034 seconds, 211 MB/s

• Make sure domU is not running. Then just add extra.img to your domU image file (here domU.img). Yes just as simple :D

$ cat domU.img extra.img > domU.resize.img

• You also need to enlarge your filesystem. I've test it with ext3 but not with ReiserFS - it seems ReiserFS needs resize_reiserfs instead of resize2fs -.

$ ef2fsck -f domU.resize.img
$ resize2fs domU.resize.img

• Finally modify your domU config file or move domU.resize.img over domU.img.