• When we cancel an AIO request that is already being processed by
    aio_thread, qemu_paio_cancel should return QEMU_PAIO_NOTCANCELED as long
    as aio_thread isn't done with this request. But as the latter currently
    updates aiocb->ret after every block of the request, we may report
    QEMU_PAIO_ALLDONE too early.
    
    Futhermore, in case some zero-length request should have been queued,
    aiocb->ret is never set to != -EINPROGRESS and callers like
    raw_aio_cancel could get stuck in an endless loop.
    
    Fix those issues by updating aiocb->ret _after_ the request has been
    fully processed. This also simplifies the locking.
    
    Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
    Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
    
    
    
    git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6278 c046a42c-6fe2-441c-8c8c-71466251a162
    aliguori authored
     
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