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Re: [Qemu-block] [PATCH v2 08/13] block: Support meta dirty bitmap

From: Fam Zheng
Subject: Re: [Qemu-block] [PATCH v2 08/13] block: Support meta dirty bitmap
Date: Tue, 26 Jan 2016 14:25:44 +0800
User-agent: Mutt/1.5.21 (2010-09-15)

On Fri, 01/22 15:05, Vladimir Sementsov-Ogievskiy wrote:
> >In my migration series I need iterators, get granularity, and
> >something like hbitmap_count  for meta bitmaps. You can add them
> >here if you want, or I can add them in my series.

Okay, I can add that.

I have one more question on the interface: what dirty bitmaps are going to be
migrated? At this moment there are dirty bitmaps created by block jobs
(drive-mirror), and in-memory dirty bitmaps created for incremental backup;
later there will be persistent dirty bitmaps owned by block drivers (extended
version of qcow2, and in QBM driver I'm working on). Which of them are subject
of migration in your series?

I'm asking because I want to know whether we need to implement multiple meta
bitmaps on one block dirty bitmap.


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