Comment 13 for bug 955272

Online resize still fails:

ubuntu@srv-eej0z:~$ sudo resize2fs /dev/loop0
resize2fs 1.42 (29-Nov-2011)
Filesystem at /dev/loop0 is mounted on /mnt; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 80
Performing an on-line resize of /dev/loop0 to 335544320 (4k) blocks.
resize2fs: Operation not permitted While trying to add group #8192

But the extended filesystem remains consistent when it does. The failure occurs at the maximum blocks that were shown when the original 1G filesystem was created.

So perhaps all we need to do is catch the error and report that the maximum filesystem size has been reached.