Re: [Qemu-devel] [PATCH v4 11/13] block/mirror: Add active mirroring

[Eric Blake]

On 04/11/2018 01:54 PM, Max Reitz wrote:
> This patch implements active synchronous mirroring.  In active mode, the
> passive mechanism will still be in place and is used to copy all
> initially dirty clusters off the source disk; but every write request
> will write data both to the source and the target disk, so the source
> cannot be dirtied faster than data is mirrored to the target.  Also,
> once the block job has converged (BLOCK_JOB_READY sent), source and
> target are guaranteed to stay in sync (unless an error occurs).
> 
> Active mode is completely optional and currently disabled at runtime.  A
> later patch will add a way for users to enable it.
> 
> Signed-off-by: Max Reitz <address@hidden>
> Reviewed-by: Fam Zheng <address@hidden>
> ---
>  qapi/block-core.json |  18 ++++
>  block/mirror.c       | 252 
> ++++++++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 265 insertions(+), 5 deletions(-)
> 
> diff --git a/qapi/block-core.json b/qapi/block-core.json
> index c50517bff3..8210d601f4 100644
> --- a/qapi/block-core.json
> +++ b/qapi/block-core.json
> @@ -1049,6 +1049,24 @@
>  { 'enum': 'MirrorSyncMode',
>    'data': ['top', 'full', 'none', 'incremental'] }
>  
> +##
> +# @MirrorCopyMode:
> +#
> +# An enumeration whose values tell the mirror block job when to
> +# trigger writes to the target.
> +#
> +# @background: copy data in background only.
> +#
> +# @write-blocking: when data is written to the source, write it
> +#                  (synchronously) to the target as well.  In
> +#                  addition, data is copied in background just like in
> +#                  @background mode.
> +#
> +# Since: 2.12

Missed an instance of 2.13

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

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