[PATCH v2 1/2] blk-mq: add tagset quiesce interface

[Christoph Hellwig]

On Wed, Oct 19, 2022 at 10:57:11AM +0300, Sagi Grimberg wrote:
>
>
> On 10/19/22 10:32, Christoph Hellwig wrote:
>> On Wed, Oct 19, 2022 at 10:30:44AM +0300, Sagi Grimberg wrote:
>>> iscsi defers network sends to a workqueue anyways, and no scsi lld sets
>>> BLK_MQ_F_BLOCKING.
>>
>> Yes, but Mike had a series to implement a similar fast path as nvme-tcp
>> as while ago that included supporting BLK_MQ_F_BLOCKING in the scsi
>> midlayer.
>
> Hmmm, didn't see that, pointer?

https://www.spinics.net/lists/linux-scsi/msg170849.html

>>  We'll also need it to convert the paride drivers to libata,
>> but those are single request_queue per tag_set as far as I know.
>
> didn't see paride even attempting to quiesce...

The block layer might.  But it really does not matter for our
considerations here..