[Qemu-devel] [PATCH v3 00/10] backup compression

[Denis V. Lunev]

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 <address@hidden>
Signed-off-by: Denis V. Lunev <address@hidden>
CC: Jeff Cody <address@hidden>
CC: Markus Armbruster <address@hidden>
CC: Eric Blake <address@hidden>
CC: John Snow <address@hidden>
CC: Stefan Hajnoczi <address@hidden>
CC: Kevin Wolf <address@hidden>

Pavel Butsykin (10):
  block/io: add bdrv_co_write_compressed
  qcow2: add qcow2_co_write_compressed
  vmdk: add vmdk_co_write_compressed
  qcow: add qcow_co_write_compressed
  block: remove BlockDriver.bdrv_write_compressed
  drive-backup: added support for data compression
  blockdev-backup: added support for data compression
  qemu-iotests: test backup compression in 055
  block: fix backup in vmdk format image
  qemu-iotests: add vmdk for test backup compression in 055

 block/backup.c                |  13 +++++
 block/io.c                    |  57 ++++++++++++++++++--
 block/qcow.c                  |  78 ++++++++++++++++------------
 block/qcow2.c                 |  89 ++++++++++++++++++-------------
 block/vmdk.c                  |  61 ++++------------------
 blockdev.c                    |  20 ++++++-
 hmp-commands.hx               |   8 +--
 hmp.c                         |   3 +-
 include/block/block.h         |   2 +
 include/block/block_int.h     |   5 +-
 qapi/block-core.json          |   3 +-
 qemu-img.c                    |   2 +-
 qmp-commands.hx               |   7 ++-
 tests/qemu-iotests/055        | 118 ++++++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/055.out    |   4 +-
 tests/qemu-iotests/iotests.py |  10 ++--
 16 files changed, 336 insertions(+), 144 deletions(-)

--

Changes from v1:
- added unittest for backup compression (8)

Changes from v2:
- implemented a new .bdrv_co_write_compressed interface to replace the
  old .bdrv_write_compressed (1,2,3,4,5)

2.1.4