On Mon, Nov 19, 2018 at 12:51:26PM +0900, Damien Le Moal wrote:

bio->bi_ioc is never set so always NULL. Remove references to it in
bio_disassociate_task() and in rq_ioc() and delete this field from
struct bio. With this change, rq_ioc() always returns
current->io_context without the need for a bio argument. Further
simplify the code and make it more readable by also removing this
helper, which also allows to simplify blk_mq_sched_assign_ioc() by
removing its bio argument.

Signed-off-by: Damien Le Moal <redacted>

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>