TODO

- Port zpool. zpool depends on libdiskmgt, which is a private API on Solaris.
  Porting it wholesale to Haiku won't work. A better approach would be to
  figure out what exactly zpool needs from libdiskmgt and then implement those
  routines on Haiku.

- libsolcompat should be tested thoroughly.

- The port currently uses pthreads for threading (see thread.h in
  libsolcompat). This approach will not work in the kernel. A compatibility
  layer emulating the Solaris kernel threading API using the Haiku threading
  API must be created.

- kernel.c, taskq.c and util.c in lib/libzpool/common/ must be rewritten using
  Haiku's threading API. These 3 files emulate part of the Solaris kernel API
  in userland. ztest fails on Haiku purely because of threading issues in these
  files.

- Our libumem does nothing. It merely wraps malloc() and free(). libumem is not
  strictly required for ZFS to work, but it helps while debugging memory
  issues in userland. A portable version of libumem exists at
  https://labs.omniti.com/labs/portableumem. This can be ported to Haiku if
  desired.

- libxdr should be tested.

- The codebase is structured inconsistently. It should be restructured and the
  build system adjusted appropriately.

- The build system itself uses a few hacks here and there.