This patch is based on linux-2.6.11.6.patch from the fr1-2.17 [1] package
from  Peter T. Breuer (ptb@ot.uc3m.es). He did all the brainwork, i just
edited the patch to make it apply to a pristine linux 2.6.12.2 kernel.

Before applying, you may want to have a look at line 1708 of this patch:

+// #ifdef CONFIG_MD_FR1
+//                if (0)
+// #endif /* CONFIG_MD_FR1 */

This is from broken-out/linux-2.6.11.6.patch_2.2. it does not 
apply on 2.6.12.2 any more and i really don't know where it
belongs. so I commented it out. It compiles but perhaps your 
(my?) RAID will blow up. not good :(


[1] http://www.it.uc3m.es/~ptb/nbd/
    ftp://oboe.it.uc3m.es/pub/Programs/