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Re: [Qemu-devel] [PATCH v2 10/11] blockjob: refactor backup_start as bac

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v2 10/11] blockjob: refactor backup_start as backup_job_create
Date: Tue, 11 Oct 2016 10:56:28 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0

On 11/10/2016 00:51, John Snow wrote:
>> Clearing the bitmap is a bug because the caller could expect that the
>> bitmap is in its original state if the transaction fails. I doubt this
>> is a problem in practice, but we should fix it anyway.
> We make a backup to undo the process if it fails. I only mention it to
> emphasize that the atomic point appears to be during prepare. In
> practice we hold the locks for the whole process, but... I think Paolo
> may be actively trying to change that.

Even now, atomicity must be ensured with bdrv_drained_begin/end.  The
AioContext lock does not promise atomicity.


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