Re: [RFC qemu 0/6] mirror: implement incremental and bitmap modes

[Max Reitz <mreitz@redhat.com>]

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On 18.02.20 11:07, Fabian Grünbichler wrote:

[Sorry :/]

> picking up on John's in-progress patch series from last summer, this is
> a stab at rebasing and adding test cases for the low-hanging fruits:
> 
> - bitmap mirror mode with always/on-success/never bitmap sync mode
> - incremental mirror mode as sugar for bitmap + on-success
> 
> Fabian Grünbichler (4):
>   mirror: add check for bitmap-mode without bitmap
>   mirror: switch to bdrv_dirty_bitmap_merge_internal
>   iotests: add test for bitmap mirror
>   mirror: move some checks to QMP
> 
> John Snow (2):
>   drive-mirror: add support for sync=bitmap mode=never
>   drive-mirror: add support for conditional and always bitmap sync modes

Looks reasonable to me.  I would indeed merge patches 2 through 4 into a
single one, and perhaps switch patches 5 and 6.

Also, we still need an S-o-b from John on patch 2.

I have one question: When the mirror job completes successfully (or is
cancelled “successfully”), the bitmap is always fully cleared when the
job completes, right?  (Unless in “never” mode.)

Not that I think we should change the current implementation of “clear
sync_bitmap; merge dirty_bitmap into sync_bitmap;”.  Just a question for
understanding.


Soo...  What’s the plan?

Max


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