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block: Quiesce old aio context during bdrv_set_aio_context
The fact that the bs->aio_context is changing can confuse the dataplane iothread, because of the now fine granularity aio context lock. bdrv_drain should rather be a bdrv_drained_begin/end pair, but since bs->aio_context is changing, we can just use aio_disable_external and bdrv_parent_drained_begin. Reported-by: Ed Swierk <[email protected]> Signed-off-by: Fam Zheng <[email protected]> Acked-by: Stefan Hajnoczi <[email protected]> Reviewed-by: Stefan Hajnoczi <[email protected]> Reviewed-by: Kevin Wolf <[email protected]>
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