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Re: [Qemu-block] [PATCH v2 06/16] backup: Request BLK_PERM_AIO_CONTEXT_C

From: Fam Zheng
Subject: Re: [Qemu-block] [PATCH v2 06/16] backup: Request BLK_PERM_AIO_CONTEXT_CHANGE on target
Date: Wed, 24 May 2017 10:18:44 +0800
User-agent: Mutt/1.8.0 (2017-02-23)

On Thu, 05/11 15:41, Stefan Hajnoczi wrote:
> On Wed, Apr 19, 2017 at 05:43:46PM +0800, Fam Zheng wrote:
> > What's done in the source's context change notifier is moving the
> > target's context to follow the new one, so we request this permission
> > here.
> It's true that the backup block job must be able to set target's
> AioContext, but does this change also allow other users to set target's
> AioContext while the backup job is running?  If yes, then we need to
> handle that.

If through job->target, yes, but I don't think there is any user of job->target.
Otherwise, it's not allowed, because the second parameter of blk_new doesn't

So it's okay.


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