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Re: [Qemu-block] [PATCH v6 01/11] blockdev: abort transactions in revers

From: Eric Blake
Subject: Re: [Qemu-block] [PATCH v6 01/11] blockdev: abort transactions in reverse order
Date: Fri, 11 Jan 2019 13:34:18 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1

On 1/11/19 11:52 AM, Eric Blake wrote:
> On 12/21/18 3:35 AM, John Snow wrote:
>> Presently, we abort transactions in the same order they were processed in.
>> Bitmap commands, though, attempt to restore backup data structures on abort.
>> That's not valid, they need to be aborted in reverse chronological order.
>> Replace the QSIMPLEQ data structure with a QTAILQ one, so we can iterate
>> in reverse for the abort phase of the transaction.
> This patch conflicts with Paolo's improvements to QTAILQ that just
> landed; the resolution should be obvious, but at this point, you'll want
> to post a v7.
> Or did you want me to try and fix the conflict, and take the series
> through my NBD tree since I have patches based on top of it?

Actually, I went ahead and queued this series in my NBD tree after
making the fixes, so I can get the removal of x- in place sooner for
easier integration testing on my libvirt code.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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