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Re: [Qemu-devel] Re: [PATCH] block: Enable fall-back to read-only for ba
From: |
Alexander Graf |
Subject: |
Re: [Qemu-devel] Re: [PATCH] block: Enable fall-back to read-only for backing file |
Date: |
Mon, 01 Feb 2010 11:05:11 +0100 |
User-agent: |
Thunderbird 2.0.0.23 (X11/20090817) |
Christoph Hellwig wrote:
> On Mon, Feb 01, 2010 at 10:25:52AM +0100, Alexander Graf wrote:
>
>> We don't know beforehand if a user will use the commit comnand during
>> tje runtime of the vm.
>>
>> IMHO it'd be best to always open backing files read only and try to
>> open them for write access on the commit command. That command can
>> then fail gaciously.
>>
>
> That's another option. Basically this means opening another
> BlockDriverState for the backing device that is writeable inside
> bdrv_commit().
>
Or another function call hook to change the backing device state from RO
to RW.
Alex