aio: return "AIO in progress" state from qemu_aio_wait
The definition of when qemu_aio_flush should loop is much simpler than it looks. It just has to call qemu_aio_wait until it makes no progress and all flush callbacks return false. qemu_aio_wait is the logical place to tell the caller about this. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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