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Re: [Qemu-devel] [PULL 48/48] iotests: Test qemu-img convert -S 0 behavi

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PULL 48/48] iotests: Test qemu-img convert -S 0 behavior
Date: Thu, 7 Apr 2016 16:40:57 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 29/03/2016 17:08, Kevin Wolf wrote:
> From: Max Reitz <address@hidden>
> Passing -S 0 to qemu-img convert should result in all source data being
> copied to the output, even if that source data is known to be 0. The
> output image should therefore have exactly the same size on disk as an
> image which we explicitly filled with data.
> Signed-off-by: Max Reitz <address@hidden>
> Reviewed-by: Fam Zheng <address@hidden>
> Signed-off-by: Kevin Wolf <address@hidden>

This fails with XFS and raw format, which preallocates an extra cluster
at the end of the file created with qemu-io (so that the on-disk size is
2056 512-byte blocks).


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