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From: "Denis V. Lunev" <den@openvz.org>
Message-ID: <57207ED6.1080508@openvz.org>
Date: Wed, 27 Apr 2016 11:56:54 +0300
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Subject: Re: [Qemu-devel] [PATCH for 2.7 v2 0/3] backup compression
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To: qemu-devel@nongnu.org
Cc: Pavel Butsykin <pbutsykin@virtuozzo.com>, Jeff Cody <jcody@redhat.com>, Markus Armbruster <armbru@redhat.com>, Eric Blake <eblake@redhat.com>, John Snow <jsnow@redhat.com>, Stefan Hajnoczi <stefanha@redhat.com>

On 04/27/2016 09:28 AM, Denis V. Lunev wrote:
> The idea is simple - backup is "written-once" data. It is written block
> by block and it is large enough. It would be nice to save storage
> space and compress it.
>
> These patches add the ability to compress data during backup. This
> functionality is implemented by means of adding options to the qmp/hmp
> commands(drive-backup, blockdev-backup). The implementation is quite
> simple, because the responsibility for data compression imposed on the
> format driver.
>
> Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
> Signed-off-by: Denis V. Lunev <den@openvz.org>
> CC: Jeff Cody <jcody@redhat.com>
> CC: Markus Armbruster <armbru@redhat.com>
> CC: Eric Blake <eblake@redhat.com>
> CC: John Snow <jsnow@redhat.com>
> CC: Stefan Hajnoczi <stefanha@redhat.com>
>
> Changes from v1:
> - added unittest for backup compression (3)
>
> Pavel Butsykin (3):
>    drive-backup: added support for data compression
>    blockdev-backup: added support for data compression
>    qemu-iotests: test backup compression in 055
>
>   block/backup.c                | 13 ++++++
>   blockdev.c                    | 20 ++++++++-
>   hmp-commands.hx               |  8 ++--
>   hmp.c                         |  3 +-
>   include/block/block_int.h     |  1 +
>   qapi/block-core.json          |  3 +-
>   qmp-commands.hx               |  7 +++-
>   tests/qemu-iotests/055        | 97 +++++++++++++++++++++++++++++++++++++++++++
>   tests/qemu-iotests/055.out    |  4 +-
>   tests/qemu-iotests/iotests.py | 10 ++---
>   10 files changed, 150 insertions(+), 16 deletions(-)
>
pls do not spend the time with this at the moment.
Locking and some other stuff should be re-worked.

Thank you.

Den