Re: [Qemu-devel] [Qemu-block] [PATCH 4/4] blockjob: reimplement block_job_sleep_ns to allow cancellation

[Stefan Hajnoczi <stefanha@gmail.com>]

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On Wed, Nov 29, 2017 at 11:25:13AM +0100, Paolo Bonzini wrote:
> This reverts the effects of commit 4afeffc857 ("blockjob: do not allow
> coroutine double entry or entry-after-completion", 2017-11-21)
> 
> This fixed the symptom of a bug rather than the root cause. Canceling the
> wait on a sleeping blockjob coroutine is generally fine, we just need to
> make it work correctly across AioContexts.  To do so, use a QEMUTimer
> that calls block_job_enter.  Use a mutex to ensure that block_job_enter
> synchronizes correctly with block_job_sleep_ns.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  blockjob.c                   | 57 +++++++++++++++++++++++++++++++++++---------
>  include/block/blockjob.h     |  5 +++-
>  include/block/blockjob_int.h |  4 ++--
>  3 files changed, 52 insertions(+), 14 deletions(-)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

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