RE: [Qemu-devel] New multiple snapshot support for VMDK.

[Igor Lvovsky]

   Hi Fabrice,

What are you think about this patch?

Are you have a comments?

If you accept it, I'll try to fix the race condition on snapshot writing.

                       

                        Regards

                                    Igor Lvovsky

 

           

 

 

 

 

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From: address@hidden [mailto:address@hidden On Behalf Of Igor Lvovsky
Sent: Monday, January 15, 2007 4:51 PM
To: address@hidden
Subject: [Qemu-devel] New multiple snapshot support for VMDK.

 

   Hi all,

It's the new patch for the multiple snapshot support for the VMDK format.

I rewrote the previous one according to the new multiple snapshots concept, introduced by Fabrice.

 

The snapshots can be created with standard way:

 

qemu-img create –b base-image.vmdk –f vmdk snapshot-img-001.vmdk

 

We can create the snapshots chain in this way.

The patch include also the 'CID' protection that defined by the VMDK format.

The CID is a value updated on the first write every time the virtual disk is opened.

 

 P.S. Fabrice, I used the bdrv_pread() and bdrv_pwrite(), as you advised me.

 

            Regards,

                        Igor Lvovsky