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Date: Mon, 02 Mar 2015 10:18:50 -0500
From: Max Reitz <mreitz@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v4 05/11] block: Move BDS close notifiers
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To: Fam Zheng <famz@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, qemu-block@nongnu.org, qemu-devel@nongnu.org, Markus Armbruster <armbru@redhat.com>, Stefan Hajnoczi <stefanha@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>

On 2015-02-27 at 21:55, Fam Zheng wrote:
> On Fri, 02/27 11:43, Max Reitz wrote:
>>   static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev,
>>                                   Error **errp)
>>   {
>> @@ -763,12 +794,26 @@ static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev,
>>       SCSIDevice *sd = SCSI_DEVICE(dev);
>>   
>>       if (s->ctx && !s->dataplane_disabled) {
>> +        VirtIOSCSIBlkChangeNotifier *insert_notifier, *remove_notifier;
>> +
>> +        insert_notifier = g_new0(VirtIOSCSIBlkChangeNotifier, 1);
>> +        insert_notifier->n.notify = virtio_scsi_blk_insert_notifier;
>> +        insert_notifier->s = s;
>> +        insert_notifier->sd = sd;
>> +        blk_add_insert_bs_notifier(sd->conf.blk, &insert_notifier->n);
>> +        QTAILQ_INSERT_TAIL(&s->insert_notifiers, insert_notifier, next);
> Could you instead embed a Notifier into SCSIDevice, similarly? That way there
> is no need to maintain a list in VirtIOSCSI.

I thought about that, but somehow SCSIDevice seemed so generic to me... 
I didn't really want to add a VirtIOSCSI pointer to it (or even just a 
notifier only to be used by virtio-scsi).

So I take it you want me to?

Max

>> +
>> +        remove_notifier = g_new0(VirtIOSCSIBlkChangeNotifier, 1);
>> +        remove_notifier->n.notify = virtio_scsi_blk_remove_notifier;
>> +        remove_notifier->s = s;
>> +        remove_notifier->sd = sd;
>> +        blk_add_remove_bs_notifier(sd->conf.blk, &remove_notifier->n);
>> +        QTAILQ_INSERT_TAIL(&s->remove_notifiers, remove_notifier, next);
>> +
>>           if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) {
>>               return;
>>           }
>> -        assert(!s->blocker);
>> -        error_setg(&s->blocker, "block device is in use by data plane");
>> -        blk_op_block_all(sd->conf.blk, s->blocker);
>> +        virtio_scsi_set_up_op_blockers(s, sd);
>>       }
> Fam