Re: [Qemu-block] [PATCH V5 09/10] block/qcow2: add lzo compress format

[Eric Blake]

On 07/25/2017 09:41 AM, Peter Lieven wrote:
> Signed-off-by: Peter Lieven <address@hidden>
> ---
>  block/qcow2-cluster.c  | 15 +++++++++++++++
>  block/qcow2.c          | 25 ++++++++++++++++++++++++-
>  configure              |  2 +-
>  docs/interop/qcow2.txt |  2 ++
>  qapi/block-core.json   | 15 ++++++++++++---
>  qemu-img.texi          |  1 +
>  6 files changed, 55 insertions(+), 5 deletions(-)
> 

> +++ b/docs/interop/qcow2.txt
> @@ -335,6 +335,8 @@ The fields of the compress format extension are:
>                     deflate: Standard zlib deflate compression without
>                              compression header
>  
> +                   lzo:     LZO1X compression without additional header
> +
>                14:  compress_level (uint8_t)
>  
>                     0 = default compress level (valid for all formats, 
> default)

What do compress_level and compress_window have to be for lzo?  (If they
are not useful, document that it must be 0 - which you've already done
for compress_level).


> +# @Qcow2CompressLZO:
> +#
> +# Since: 2.10

2.11

> +##
> +{ 'struct': 'Qcow2CompressLZO',
> +  'data': { } }
> +
> +##
>  # @Qcow2Compress:
>  #
>  # Specifies the compression format and compression level that should
> @@ -2491,8 +2500,8 @@
>  { 'union': 'Qcow2Compress',
>    'base': { 'format': 'Qcow2CompressFormat' },
>    'discriminator': 'format',
> -  'data': { 'deflate': 'Qcow2CompressDeflate' } }
> -
> +  'data': { 'deflate': 'Qcow2CompressDeflate',
> +            'lzo': 'Qcow2CompressLZO' } }
>  

Was the loss of the blank line intentional?

> +++ b/qemu-img.texi
> @@ -682,6 +682,7 @@ The following options are available if support for the 
> respective libraries
>  has been enabled at compile time:
>  
>     deflate        Uses standard zlib defalte compression
> +   lzo            Uses LZO1X compression

The .json file spelled it lzo1x; is there a difference implied by the
choice of capitalization?

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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