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 <mre...@redhat.com>
> Reviewed-by: Fam Zheng <f...@redhat.com>
> ---
> 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: 2.12Missed 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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