[Please use this version rather than the version sent earlier today
which did not fix the flush command properly]
This patch implements FUA (Force Unit Access) and FLUSH commands
and support for rotational devices for network block devices. They have
been tested and appear to work as specified.
See
http://git.alex.org.uk/nbd-module.git
for a git tree containing this items. Commits in this tree are on
an out-of-tree version of nbd.ko (so it can be built without recompiling
the kernel), though the commits/patches should apply to an in-tree
version of nbd.