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Re: [Qemu-devel] [PATCH v2 05/12] block: Introduce "drained begin/end" A


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v2 05/12] block: Introduce "drained begin/end" API
Date: Tue, 13 Oct 2015 12:39:15 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0


On 13/10/2015 11:31, Kevin Wolf wrote:
> This would mean that once you've sent an I/O request inside a drain
> section, you have to expect that more internal I/O might be going on
> after the request has completed. If you don't want this, you have to
> issue another bdrv_drain() or use a nested bdrv_drained_begin/end()
> section.

Yes.

> Sounds reasonable enough to me, but I guess this should be explicitly
> documented.

I agree.  Perhaps bdrv_drained_begin/end() could be renamed to
bdrv_drain_and_lock() / bdrv_unlock()?

Paolo



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