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 <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> Pavel Butsykin (2): drive-backup: added support for data compression blockdev-backup: added support for data compression 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 +++++-- 7 files changed, 46 insertions(+), 9 deletions(-) -- 2.1.4
