v1:
https://www.redhat.com/archives/libguestfs/2019-June/msg00014.html
I pushed a few bits which are uncontroversial. The main
changes since v1 are:
An extra patch removes the want_to_send / check for nbd_aio_is_ready
in examples/threaded-reads-and-writes.c. This logic was wrong since
commit 6af72b87 as was pointed out by Eric in his review. Comments
and structure of examples/concurrent-writes.c has been updated to
match.
Callbacks now return int instead of void. In some cases we ignore
this return value.
I added a lot more commentary in the commit message for the main patch
(now patch 3 in this series).
Rich.