remove ->rq_disk

[Ming Lei]

Hello Christoph,

On Tue, Sep 28, 2021 at 07:22:06AM +0200, Christoph Hellwig wrote:
> Hi Jens,
> 
> this series removes the rq_disk field in struct request, which isn't
> needed now that we can get the disk from the request_queue.

Can we hold on this series until q->disk becomes really reliable[1][2]?

[1] https://lore.kernel.org/linux-block/20210922172222.2453343-1-hch@lst.de/T/#t
[2] https://lore.kernel.org/linux-block/YUQOBKa67R9pEunr@T590.Home/#r


Thanks,
Ming