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Re: [Qemu-devel] [Qemu-block] [PATCH v10 08/10] Implement new driver for

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [Qemu-block] [PATCH v10 08/10] Implement new driver for block replication
Date: Mon, 12 Oct 2015 17:27:14 +0100
User-agent: Mutt/1.5.24 (2015-08-30) 
On Fri, Sep 25, 2015 at 02:17:36PM +0800, Wen Congyang wrote:
> +        /* start backup job now */
> +        bdrv_op_unblock(s->hidden_disk, BLOCK_OP_TYPE_BACKUP_TARGET,
> +                        s->active_disk->backing_blocker);
> +        bdrv_op_unblock(s->secondary_disk, BLOCK_OP_TYPE_BACKUP_SOURCE,
> +                        s->hidden_disk->backing_blocker);

Why is it safe to unblock these operations?

Why do they have to be blocked for non-replication users?

Stefan
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