Ok here is the ubd-many stuff on top of the COW stacking patch.
this version has been tested with stacks ot up to 25 COW files on top of
each other and up to 512 disks all of which were 512GiB in size with a
COW file for each and shareing the 512GiB backing file I dont actaully
have the 256TiB of disk space, though it will not be too many years,
before I can have that much :) moore's law is nice for consumers.
Note that only the first 16 ubd devices should be specified on the
command line, this is not enforced at the moment nor does this version
close the files or make the backing file name absloute, it is however
fun to try out insane numbers of COW files stacked or in huge disk
Does anyone have anything else to consider for a V3 header I still
intend to add the file name offset/length so that it is not fixed by the
struct defination. I also need to get fake_major working again, I was
planning on dropping the fake proc entries as I am fairly sure that they
are wrong in recent kernels, nor do I know what they should look like.