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Re: [PATCH 01/12] introduce BDRV_POLL_WHILE_UNLOCKED


From: Stefan Hajnoczi
Subject: Re: [PATCH 01/12] introduce BDRV_POLL_WHILE_UNLOCKED
Date: Wed, 26 Jan 2022 10:49:52 +0000

On Tue, Jan 18, 2022 at 11:27:27AM -0500, Emanuele Giuseppe Esposito wrote:
> Same as BDRV_POLL_WHILE, but uses AIO_WAIT_WHILE_UNLOCKED.
> 
> Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
> ---
>  include/block/block-global-state.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/include/block/block-global-state.h 
> b/include/block/block-global-state.h
> index 419fe8427f..7ad9496f56 100644
> --- a/include/block/block-global-state.h
> +++ b/include/block/block-global-state.h
> @@ -158,6 +158,11 @@ void bdrv_drain_all(void);
>      AIO_WAIT_WHILE(bdrv_get_aio_context(bs_),              \
>                     cond); })
>  
> +#define BDRV_POLL_WHILE_UNLOCKED(bs, cond) ({              \
> +    BlockDriverState *bs_ = (bs);                          \
> +    AIO_WAIT_WHILE_UNLOCKED(bdrv_get_aio_context(bs_),     \
> +                            cond); })

No doc comments? When and why is this API useful? Are there any
preconditions or assumptions (e.g. cond must be thread-safe)?

Stefan

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