On Tue, May 31, 2016 at 12:15:27PM +0300, Denis V. Lunev wrote: > From: Pavel Butsykin <pbutsy...@virtuozzo.com> > > 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. > > The patch adds a flag to the qmp/hmp drive-backup command which enables > block compression. Compression should be implemented in the format driver > to enable this feature. > > There are some limitations of the format driver to allow compressed writes. > We can write data only once. Though for backup this is perfectly fine. > These limitations are maintained by the driver and the error will be > reported if we are doing something wrong. > > Signed-off-by: Pavel Butsykin <pbutsy...@virtuozzo.com> > Signed-off-by: Denis V. Lunev <d...@openvz.org> > CC: Jeff Cody <jc...@redhat.com> > CC: Markus Armbruster <arm...@redhat.com> > CC: Eric Blake <ebl...@redhat.com> > CC: John Snow <js...@redhat.com> > CC: Stefan Hajnoczi <stefa...@redhat.com> > CC: Kevin Wolf <kw...@redhat.com> > --- > block/backup.c | 13 +++++++++++++ > blockdev.c | 12 ++++++++++-- > hmp-commands.hx | 8 +++++--- > hmp.c | 3 ++- > include/block/block_int.h | 1 + > qapi/block-core.json | 5 ++++- > qmp-commands.hx | 5 ++++- > 7 files changed, 39 insertions(+), 8 deletions(-)
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
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