network accessed disks

[Ted Unangst <tedu_(_at_)_zeitbombe_(_dot_)_org>]

introducing what i'm calling network accessed disks, which are roughly 
similar to network block devices.  it's really a kernel/userland gateway 
for disk i/o, with a userland component fetching data over the network.
for this reason, the interface is called "ud" instead of "nad".
the code works, but it's rough.
1.  no glue included.  you're on your own patching conf.c and MAKEDEV.
2.  no documentation.
3.  it's "student code" not production code.

i'm dumping a tarball, as is, at http://www.zeitbombe.org/nad.tgz.  no 
warranty, no guarantee, no support.


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