Mount loop device error with dazukofs: ioctl: LOOP_SET_FD: Invalid argument

Hi, I can't mount iso images.

to reproduce:

$ sudo modprobe dazukofs
$ sudo mount -t dazukofs ./dazukofs_test/ ./dazukofs_test/
$ sudo mount -o loop ./dazukofs_test/debian-500-i386-DVD-1.iso /tmp/a
ioctl: LOOP_SET_FD: Invalid argument

I use:
DazukoFS 3.0.0
Linux version 2.6.20.4-486 (root@alexander) (gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)) #1 Sat Oct 20 16:29:17 MSD 2007

-- 
Alexander Korkov