[Qemu-devel] [PATCH 0/8] Fix bdrv_read/write emulation

[Kevin Wolf]

The other day we re-introduced synchronous qcow2 read/write functions to work
around the buggy bdrv_read/write emulation, this series implements the proper
fix for it.

Basically what it's doing is to ensure that the emulation only runs its own
AIO callbacks and bottom halves. Callbacks from outside need to wait so they
can't corrupt the internal state of the driver calling bdrv_read/write (and
assuming that nobody else runs in between).

Kevin Wolf (8):
  posix-aio-compat: Split out posix_aio_process_queue
  Add qemu_aio_process_queue()
  Split out bottom halves
  Introduce contexts for asynchronous callbacks
  block: Use new AsyncContext for bdrv_read/write emulation
  posix-aio-compat: Honour AsyncContext
  linux-aio: Honour AsyncContext
  Revert "qcow2: Bring synchronous read/write back to life"

 Makefile.target       |    2 +-
 aio.c                 |   30 +++++++
 async.c               |  216 +++++++++++++++++++++++++++++++++++++++++++++++++
 block.c               |   22 ++++-
 block/curl.c          |    8 +-
 block/qcow2-cluster.c |    6 +-
 block/qcow2.c         |   51 +-----------
 block/qcow2.h         |    3 -
 linux-aio.c           |   87 ++++++++++++++++----
 posix-aio-compat.c    |   58 +++++++++----
 qemu-aio.h            |   13 +++
 qemu-common.h         |    5 +
 qemu-tool.c           |   13 +++
 vl.c                  |  104 -----------------------
 14 files changed, 418 insertions(+), 200 deletions(-)
 create mode 100644 async.c