[Qemu-devel] [RFC PATCH 0/3] io/nbd: AioContext support

[Paolo Bonzini <pbonzini@redhat.com>]

This is RFC because the APIs it uses (aio_co_schedule/aio_co_wake) do
not exist yet in master, but it should be enough for a first review of
the QIOChannel API concepts and to give an idea of their usage.

It makes qio_channel_yield aware of AioContexts by adding a new
API qio_channel_set_aio_context, and it lets separate coroutines
use qio_channel_yield for reading vs. writing.

The last patch rewrites the NBD client's I/O management to use the
new infrastructure (and I think the logic here was first proposed
years ago by Stefan).  The benefit is that the new version does not
block if the server writes a partial reply header, and is also a
bit smaller.

Paolo

Paolo Bonzini (3):
  io: add methods to set I/O handlers on AioContext
  io: make qio_channel_yield aware of AioContexts
  nbd: do not block on partial reply header reads

 block/nbd-client.c   | 108 ++++++++++++++++++++-------------------------------
 include/io/channel.h |  41 +++++++++++++++++++
 io/channel-socket.c  |  16 +++++---
 io/channel-tls.c     |  12 ++++++
 io/channel-watch.c   |   6 +++
 io/channel.c         |  87 +++++++++++++++++++++++++++++++----------
 6 files changed, 178 insertions(+), 92 deletions(-)

-- 
2.9.3