Re: [Qemu-devel] [PATCH 0/4] keep and use backing file format (v7)

[Anthony Liguori <aliguori@us.ibm.com>]

Uri Lublin wrote:
> In this patchset there are two main features:
> 1. Introduce Qcow2 extensions.
> 2. Keep backing file format such that no probing is needed.
>
> 1. Qcow2 extensions are build of magic (id) len (in bytes) and data.
> They reside between the end of the header and the backing filename (if exists).
> Unknown extensions are ignored (assumed to be added by a newer version)
> Based on a work done by Shahar Frank.
>
> 2. By keeping the backing file format we:
> a. Provide a way to know the backing file format without probing
>    it (setting the format at creation time).
> b. Enable using qcow2 format over host block devices.
>    (only if the user specifically asks for it, by providing the format
>    at creation time).
>
> I've added bdrv_create2 and drv->bdrv_create2 (implemented only
> by block-qcow2 currently) to pass the backing-format to create.
>
> Also fixes a security flaw found by Daniel P. Berrange on [1]
> which summarizes: "Autoprobing: just say no."
>
> [1] http://lists.gnu.org/archive/html/qemu-devel/2008-12/msg01083.html
>
> Changes from v6:
>    Rebased.
>    Postponed highest-allocated-block patches.
>   

Applied all.  Thanks.

Regards,

Anthony Liguori

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