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Re: [Qemu-block] [PATCH v3 3/4] qcow2: add shrink image support
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From: |
Max Reitz |
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Subject: |
Re: [Qemu-block] [PATCH v3 3/4] qcow2: add shrink image support |
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Date: |
Mon, 10 Jul 2017 00:08:25 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 |
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 <address@hidden>
>> ---
>> 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
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