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Re: [Qemu-devel] [PATCH v2 3/3] qemu-iotests: Some more write_zeroes tes

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH v2 3/3] qemu-iotests: Some more write_zeroes tests
Date: Wed, 18 May 2016 08:12:22 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0

On 05/18/2016 06:27 AM, Kevin Wolf wrote:
> This covers some more write_zeroes cases which are relevant for the
> recent qcow2 optimisations that check the allocation status of the
> backing file for partial cluster write_zeroes requests.
> This needs to be separate from 034 because we can only support qcow2 in
> this test case for multiple reasons: We check the allocation status
> after write_zeroes with 'qemu-img map' and the optimised behaviour that
> produces zero clusters is only implemented in qcow2; second, the map
> command returns offsets that are qcow2 specific; and finally, we also
> use 512 byte clusters which aren't supported for formats like qed.
> Signed-off-by: Kevin Wolf <address@hidden>
> ---
> v2:
> - Some more test cases, including one suggested by Eric
> - Comments in the test script that visualise each case with ASCII art


> +# qcow2 specific bdrv_write_zeroes tests with backing files (complements 034)

Maybe also worth a one line tweak to 034 to give a comment pointing to
this file (so the two mutually reference each other), but that doesn't
require a respin.

Reviewed-by: Eric Blake <address@hidden>

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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