Re: [RFC PATCH 0/6] Removal of Aiocontext lock and usage of subtree drains in aborted transactions

[Emanuele Giuseppe Esposito]

On 13/12/2021 15:52, Stefan Hajnoczi wrote:
> Off-topic: I don't understand the difference between the effects of
> bdrv_drained_begin() and bdrv_subtree_drained_begin(). Both call
> aio_disable_external(aio_context) and aio_poll(). bdrv_drained_begin()
> only polls parents and itself, while bdrv_subtree_drained_begin() also
> polls children. But why does that distinction matter? I wouldn't know
> when to use one over the other.

Good point. Now I am wondering the same, so it would be great if anyone 
could clarify it.

Emanuele