On 2018-04-12 00:14, Eric Blake wrote:
> 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: 2.12
>
> Missed an instance of 2.13:-/ Will fix. Max
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