qed: Use CoQueue for serialising allocations
Now that we're running in coroutine context, the ad-hoc serialisation code (which drops a request that has to wait out of coroutine context) can be replaced by a CoQueue. This means that when we resume a serialised request, it is running in coroutine context again and its I/O isn't blocking any more. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
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