Problem with cd eject via network block device

[Steve Bergman]

I am running the current Fedora development branch with current kernel.

Using nbd-2.6 user space utilities.

When I try to "eject /dev/nd1" I get:

eject: unable to eject, last error: Invalid argument

nbd userland utils are not part of Fedora but nbd kernel module is. 
Should I bugzilla this or is it not really supported?

Pertinent section of strace follows:

7883  open("/dev/nd1", O_RDONLY|O_NONBLOCK) = 3
7883  ioctl(3, 0x5309, 0xbffffad8)      = -1 EINVAL (Invalid argument)
7883  ioctl(3, FIBMAP, 0xbffff980)      = -1 EINVAL (Invalid argument)
7883  ioctl(3, FDEJECT, 0xbffffad8)     = -1 EINVAL (Invalid argument)
7883  ioctl(3, SNDCTL_MIDI_MPUMODE, 0xbffffa90) = -1 EINVAL (Invalid
argument)
7883  write(2, "eject: unable to eject, last err"..., 53) = 53