Re: [Qemu-devel] [PATCH 2/3] qcow2: add option to clean unused cache entries after some time

[Max Reitz <mreitz@redhat.com>]

On 28.05.2015 17:02, Alberto Garcia wrote:
> On Thu 28 May 2015 04:56:34 PM CEST, Max Reitz wrote:
>>>          'compat': 'str',
>>>          '*lazy-refcounts': 'bool',
>>>          '*corrupt': 'bool',
>>> -      'refcount-bits': 'int'
>>> +      'refcount-bits': 'int',
>>> +      'cache-clean-interval': 'int'
>>>      } }
>> I'm not too happy about making this part of ImageInfoSpecificQCow2.
>> Two reasons for this: First, it's eventually part of ImageInfo, which
>> is defined as "Information about a QEMU image file", but this option
>> cannot be set in the image file itself but is only a run-time option.
> That's a valid point. Now that I think of it, do we actually have a way
> to retrieve the sizes of the L2 and refcount caches? I think cache-size,
> l2-cache-size, and refcount-cache-size are already write-only values.

No, in fact we don't. Well, except for if you manage to retrieve the 
JSON filename for the qcow2 BDS, it should be part of that. :-P

Max