Re: [Qemu-devel] [PATCH v3 3/4] qcow2: add shrink image support

[Eric Blake <eblake@redhat.com>]

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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.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org


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