v3:
- Fix wrong copy-pasted function name in doc comment [Eric]
- Fix "match" -> "matches" in comment [Eric]
v2:
- Add Patch 1 & 2 to remove unused NBD aio_context arguments and dead code [Fabiano]
- Remove attach/detach prototypes from "io/channel.h" [Daniel]
- Add utility function to set fd handlers [Daniel]

The ongoing QEMU multi-queue block layer effort makes it possible for multiple
threads to process I/O in parallel. The nbd block driver is not compatible with
the multi-queue block layer yet because QIOChannel cannot be used easily from
coroutines running in multiple threads. This series changes the QIOChannel API
to make that possible.

Stefan Hajnoczi (4):
  nbd: drop unused nbd_receive_negotiate() aio_context argument
  nbd: drop unused nbd_start_negotiate() aio_context argument
  io: check there are no qio_channel_yield() coroutines during
    ->finalize()
  io: follow coroutine AioContext in qio_channel_yield()

 include/block/nbd.h              |   3 +-
 include/io/channel-util.h        |  23 ++++++
 include/io/channel.h             |  69 ++++++++---------
 include/qemu/vhost-user-server.h |   1 +
 block/nbd.c                      |  11 +--
 io/channel-command.c             |  10 ++-
 io/channel-file.c                |   9 ++-
 io/channel-null.c                |   3 +-
 io/channel-socket.c              |   9 ++-
 io/channel-tls.c                 |   6 +-
 io/channel-util.c                |  24 ++++++
 io/channel.c                     | 124 ++++++++++++++++++++++---------
 migration/channel-block.c        |   3 +-
 nbd/client-connection.c          |   3 +-
 nbd/client.c                     |  14 +---
 nbd/server.c                     |  14 +---
 qemu-nbd.c                       |   4 +-
 scsi/qemu-pr-helper.c            |   4 +-
 util/vhost-user-server.c         |  27 +++++--
 19 files changed, 228 insertions(+), 133 deletions(-)

-- 
2.41.0

On Wed, Aug 30, 2023 at 06:47:58PM -0400, Stefan Hajnoczi wrote:
> v3:
> - Fix wrong copy-pasted function name in doc comment [Eric]
> - Fix "match" -> "matches" in comment [Eric]
> v2:
> - Add Patch 1 & 2 to remove unused NBD aio_context arguments and dead code [Fabiano]
> - Remove attach/detach prototypes from "io/channel.h" [Daniel]
> - Add utility function to set fd handlers [Daniel]

I'm queuing this version (and not v2) through my NBD tree.

> 
> The ongoing QEMU multi-queue block layer effort makes it possible for multiple
> threads to process I/O in parallel. The nbd block driver is not compatible with
> the multi-queue block layer yet because QIOChannel cannot be used easily from
> coroutines running in multiple threads. This series changes the QIOChannel API
> to make that possible.
> 
> Stefan Hajnoczi (4):
>   nbd: drop unused nbd_receive_negotiate() aio_context argument
>   nbd: drop unused nbd_start_negotiate() aio_context argument
>   io: check there are no qio_channel_yield() coroutines during
>     ->finalize()
>   io: follow coroutine AioContext in qio_channel_yield()

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.
Virtualization:  qemu.org | libguestfs.org