On Fri, Jul 22, 2016 at 11:17:39AM +0300, 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. > > Changes from v1: > - added unittest for backup compression (12, 13) > > Changes from v2: > - implemented a new .bdrv_co_write_compressed interface to replace the > old .bdrv_write_compressed (2,3,4,5,6) > > Changes from v3: > - added the byte-based interfaces: > blk_pwrite_compressed()/blk_co_pwritev_compressed() (1, 7) > - fix drive/blockdev-backup documentation (10, 11) > > Changes from v4: > - added assert that offset and count are aligned (1) > - reuse RwCo and bdrv_co_pwritev() for write compressed (2) > - converted interfaces to byte-based for format drivers (2, 3, 5, 6) > - move an unrelated cleanup in a separate patches (4, 7) > - turn on dirty_bitmaps for the compressed writes (9) > - added simplify drive/blockdev-backup by using the boxed commands (10, 11) > - reworded drive/blockdev-backup documentation about compression (12, 13) > - fix s/bakup/backup/ (14) > > Changes from v5: > - rebased on master > - fix grammar (5, 8) > > Changes from v6: > - more grammar fixes (1,11) > - assignment cleanup as suggested by Eric in 11 > > 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> > > Pavel Butsykin (16): > block: switch blk_write_compressed() to byte-based interface > block: Convert bdrv_pwrite_compressed() to BdrvChild > block/io: reuse bdrv_co_pwritev() for write compressed > qcow2: add qcow2_co_pwritev_compressed > qcow2: cleanup qcow2_co_pwritev_compressed to avoid the recursion > vmdk: add vmdk_co_pwritev_compressed > qcow: add qcow_co_pwritev_compressed > qcow: cleanup qcow_co_pwritev_compressed to avoid the recursion > block: remove BlockDriver.bdrv_write_compressed > block/io: turn on dirty_bitmaps for the compressed writes > block: simplify drive-backup > block: simplify blockdev-backup > drive-backup: added support for data compression > blockdev-backup: added support for data compression > qemu-iotests: test backup compression in 055 > qemu-iotests: add vmdk for test backup compression in 055 > > block/backup.c | 12 ++- > block/block-backend.c | 27 +----- > block/io.c | 48 ++++------ > block/qcow.c | 113 +++++++++--------------- > block/qcow2.c | 128 ++++++++++----------------- > block/vmdk.c | 55 ++---------- > blockdev.c | 193 > ++++++++++++++--------------------------- > hmp-commands.hx | 8 +- > hmp.c | 24 ++--- > include/block/block.h | 5 +- > include/block/block_int.h | 5 +- > include/sysemu/block-backend.h | 4 +- > qapi/block-core.json | 18 +++- > qemu-img.c | 8 +- > qemu-io-cmds.c | 2 +- > qmp-commands.hx | 9 +- > tests/qemu-iotests/055 | 118 +++++++++++++++++++++++++ > tests/qemu-iotests/055.out | 4 +- > tests/qemu-iotests/iotests.py | 10 +-- > 19 files changed, 366 insertions(+), 425 deletions(-) > > -- > 2.1.4 >
Acked-by: Stefan Hajnoczi <stefa...@redhat.com>
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