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Re: [Qemu-block] [PATCH 2/5] block/qcow2-bitmap: Allow bitmap flushing

From: John Snow
Subject: Re: [Qemu-block] [PATCH 2/5] block/qcow2-bitmap: Allow bitmap flushing
Date: Wed, 6 Mar 2019 10:59:19 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

On 3/6/19 7:58 AM, Eric Blake wrote:
> On 3/5/19 5:43 PM, John Snow wrote:
>> Usually, we only write out bitmaps when we're about to close out the file,
>> so we always remove the bitmaps after to make it easier to determine the
>> source of truth for migration purposes.
>> However, there may be times we want to flush bitmap data more aggressively,
>> like after a truncate event where we need to make the metadata consistent
>> again.
> Or, as I've mentioned in other threads, after every
> bitmap-add/bitmap-delete operation, so that 'qemu-img info -U' can see
> which persistent bitmaps exist. But that's one step further than this
> series, so I won't insist on it today.

Yes, I was keeping that in mind as I wrote this. I think it extends to
those cases trivially, so long as Vladimir is OK with what I'm trying to do.

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