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Re: [Qemu-block] [PATCH v6 4/9] block: treat BDRV_REQ_ALLOCATE as serial

From: Eric Blake
Subject: Re: [Qemu-block] [PATCH v6 4/9] block: treat BDRV_REQ_ALLOCATE as serialising
Date: Tue, 16 Jan 2018 14:43:28 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.2

On 01/16/2018 07:04 AM, Anton Nefedov wrote:
> The idea is that ALLOCATE requests may overlap with other requests.
> Reuse the existing block layer infrastructure for serialising requests.
> Use the following approach:
>   - mark ALLOCATE serialising, so subsequent requests to the area wait
>   - ALLOCATE request itself must never wait if another request is in flight
>     already. Return EAGAIN, let the caller reconsider.
> Signed-off-by: Anton Nefedov <address@hidden>
> ---
>  block/io.c | 27 +++++++++++++++++++--------
>  1 file changed, 19 insertions(+), 8 deletions(-)

Reviewed-by: Eric Blake <address@hidden>

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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