The compression filter driver is introduced as suggested by Max.
A sample usage of the filter can be found in the test #214.
Now, multiple clusters can be written compressed.
It is useful for the backup job.
v8: The filter child was changed from the 'backing' to the 'file' one.
Discussed in the email thread with the message ID
<1573670589-229357-1-git-send-email-andrey.shinkevich@virtuozzo.com>
Andrey Shinkevich (3):
block: introduce compress filter driver
qcow2: Allow writing compressed data of multiple clusters
tests/qemu-iotests: add case to write compressed data of multiple
clusters
block/Makefile.objs | 1 +
block/filter-compress.c | 201 +++++++++++++++++++++++++++++++++++++++++++++
block/qcow2.c | 102 +++++++++++++++++------
qapi/block-core.json | 10 ++-
tests/qemu-iotests/214 | 43 ++++++++++
tests/qemu-iotests/214.out | 14 ++++
6 files changed, 340 insertions(+), 31 deletions(-)
create mode 100644 block/filter-compress.c
--
1.8.3.1