Comment 5 for bug 1447916

The bug is relatively simple to be solved (at least, it worked for me).

1 - apt-get install iscsitarget iscsitarget-dkms
2 - You will get an error compiling the DKMS module. That's OK.
3 - go to the folder /usr/src/iscsitarget-1.4.20.3+svn499/kernel and edit the file block-io.c
4 - go to line #90, and change this:

bio->bi_sector = ppos >> 9;

to this:

bio->bi_iter.bi_sector = ppos >> 9;

5 - save and close the file.
6 - dpkg-reconfigure iscsitarget-dkms
7 - it should be working by now.

I've tested the module on 14.04.2 LTS, with somewhat big loads (~30Gb of transfer) and it worked pretty well.

Hope it helps somebody :)