On 2017-07-07 23:26, Eric Blake wrote:
> On 07/07/2017 09:30 AM, Pavel Butsykin wrote:
>> This patch add shrinking of the image file for qcow2. As a result, this allows
>> us to reduce the virtual image size and free up space on the disk without
>> copying the image. Image can be fragmented and shrink is done by punching holes
>> in the image file.
>>
>> Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
>> ---
>>  block/qcow2-cluster.c  |  40 +++++++++++++++++++
>>  block/qcow2-refcount.c | 103 +++++++++++++++++++++++++++++++++++++++++++++++++
>>  block/qcow2.c          |  42 +++++++++++++++-----
>>  block/qcow2.h          |  14 +++++++
>>  qapi/block-core.json   |   3 +-
>>  5 files changed, 191 insertions(+), 11 deletions(-)
>>
> 
>> +++ b/qapi/block-core.json
>> @@ -2372,7 +2372,8 @@
>>              'cluster_alloc_bytes', 'cluster_free', 'flush_to_os',
>>              'flush_to_disk', 'pwritev_rmw_head', 'pwritev_rmw_after_head',
>>              'pwritev_rmw_tail', 'pwritev_rmw_after_tail', 'pwritev',
>> -            'pwritev_zero', 'pwritev_done', 'empty_image_prepare' ] }
>> +            'pwritev_zero', 'pwritev_done', 'empty_image_prepare',
>> +            'l1_shrink_write_table', 'l1_shrink_free_l2_clusters' ] }
> 
> Missing documentation for the additions.

Well, I'd say there's missing documentation for everything, so....

Max