Re: [PATCH v6 1/3] block: introduce compress filter driver

[Eric Blake <eblake@redhat.com>]

On 11/11/19 10:04 AM, Andrey Shinkevich wrote:
> Allow writing all the data compressed through the filter driver.
> The written data will be aligned by the cluster size.
> Based on the QEMU current implementation, that data can be written to
> unallocated clusters only. May be used for a backup job.
> 
> Suggested-by: Max Reitz <mreitz@redhat.com>
> Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
> ---
>   block/Makefile.objs     |   1 +
>   block/filter-compress.c | 212 ++++++++++++++++++++++++++++++++++++++++++++++++
>   qapi/block-core.json    |  10 ++-
>   3 files changed, 219 insertions(+), 4 deletions(-)
>   create mode 100644 block/filter-compress.c

> +++ b/qapi/block-core.json
> @@ -2884,15 +2884,16 @@
>   # @copy-on-read: Since 3.0
>   # @blklogwrites: Since 3.0
>   # @blkreplay: Since 4.2
> +# @compress: Since 4.2

Are we still trying to get this in 4.2, even though soft freeze is past? 
  Or are we going to have to defer it to 5.0 as a new feature?

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org