That driver works very well, but it does not support recent ext2 file systems. By recent, I mean newer then about Linux Kernel v2 though it may be possible to init an ext2 system in such a way that it is usable or IIRC, format the Linux Partition form OS/2.
The driver also doesn't support EAs (xttrs) and is case sensitive by default.
As usual, you should do all partitioning with OS/2 tools, fdisk in your case.