[Qemu-devel] [PATCH 0/3] nbd: Adapt for dataplane

[Max Reitz <mreitz@redhat.com>]

For the NBD server to work with dataplane, it needs to correctly access
the exported BDS. It makes the most sense to run both in the same
AioContext, therefore this series implements methods for tracking a
BDS's AioContext and makes NBD make use of this for keeping the clients
connected to that BDS in the same AioContext.

This series differs from the RFC as follows:
- The first patch for export_set_name() has been dropped.
- nbd_can_read() has been dropped and all attempts on implementing the
  required functionality for aio_set_fd_handler() as well. This is now
  implemented directly in NBD by unregistering the read handler whenever
  NBD cannot read.
- Renamed "AIO followers" to "AIO notifiers".

I tested this patch as Stefan suggested, that is, created IO load in the
guest with multiple dds from the block devices and then read from random
addresses over NBD (two block devices and one NBD client per device). I
didn't run into any problems and the NBD code indeed did attach and
detach from the respective AIO contexts, so this time I'm more confident
that it indeed does work.


Max Reitz (3):
  nbd: Drop nbd_can_read()
  block: Add AIO context notifiers
  nbd: Follow the BDS' AIO context

 block.c                   |  56 ++++++++++++++++++++++++
 include/block/block_int.h |  41 ++++++++++++++++++
 nbd.c                     | 108 ++++++++++++++++++++++++++++++++++++++--------
 3 files changed, 186 insertions(+), 19 deletions(-)

-- 
2.0.0