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Re: [Qemu-block] [PATCH v2 0/2] blockdev: Overlays are not snapshots
From: |
Max Reitz |
Subject: |
Re: [Qemu-block] [PATCH v2 0/2] blockdev: Overlays are not snapshots |
Date: |
Thu, 13 Jun 2019 21:41:23 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 |
On 03.06.19 22:22, Max Reitz wrote:
> QEMU’s always been confused over what a snapshot is: Is it the overlay?
> Is it the backing image?
>
> Confusion is rarely a good thing. I can’t think of any objective reason
> why the overlay would be a snapshot. A snapshot is something that does
> not change over time; the overlay does.
>
> (I suppose historically the reason is that “Taking an overlay” makes no
> sense, so the operations are called “Taking a snapshot”. Somehow, this
> meaning carried over to the new file that is created during that
> operation; if “Creating a snapshot” creates a file, that file must be
> the snapshot, right? Well, no, it isn’t.)
>
> Let’s fix this as best as we can. Better Nate than lever.
Applied to my block branch.
Max
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