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Re: [Qemu-devel] qemu-img: subformat=streamOptimized issue

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] qemu-img: subformat=streamOptimized issue
Date: Wed, 28 Sep 2011 11:02:50 +0100

On Wed, Sep 28, 2011 at 12:57 AM, Fam Zheng <address@hidden> wrote:
> This could be a bug. I've briefly checked. It's not limited to
> ISO->streamOptimized, but also reproduced trying to convert from VDI.
> It fails because consequential writes fall into the same cluster of
> target VMDK. The leading write allocates the cluster, and the
> following write fails the check of "no write to allocated cluster"
> because it's already allocated on the previous write.
> I'm wondering how we could avoid qemu-img initiating such writes, i.e.
> to ensure it's going in the granularity of VMDK's cluster when
> converting.

Your explanation makes sense.  Have you looked at img_convert() in the
compress=1 case?  There it works in cluster sizes.

Perhaps you can think of a way to take advantage of that or unify the
code with regular convert code path.


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