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Re: [Qemu-block] [PATCH v3 2/4] qcow2: Document some maximum size constr

From: Alberto Garcia
Subject: Re: [Qemu-block] [PATCH v3 2/4] qcow2: Document some maximum size constraints
Date: Mon, 26 Feb 2018 17:46:44 +0100
User-agent: Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu)

On Mon 26 Feb 2018 05:41:54 PM CET, Eric Blake wrote:
>> But refcount blocks are not addressed by L2 tables, so in principle
>> it should be possible to have refcount blocks after the first 64PB.
> But (if we don't make this change) that's about all you can usefully
> have (and it would be a self-referencing refcount block).

Yeah, true.

>>> +        56 - 63:    Reserved (set to 0)
>> Are we not updating REFT_OFFSET_MASK as well?
> We could, but that should be a separate patch from the spec change.
> We could also add some validation that any offsets in the header point
> to less than the 64PB limit.

Ok, let's leave that for another patch then.

Reviewed-by: Alberto Garcia <address@hidden>


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