nvme: don't use nvme_update_disk_info for the multipath disk

Currently nvme_update_ns_info_block calls nvme_update_disk_info both for
the namespace attached disk, and the multipath one (if it exists).  This
is very different from how other stacking drivers work, and leads to
a lot of complexity.

Switch to setting the disk capacity and initializing the integrity
profile, and let blk_stack_limits which already is called just below
deal with updating the other limits.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>

Author: Christoph Hellwig

drivers/nvme/host/core.c

@@ -2159,7 +2159,8 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
 
 	if (nvme_ns_head_multipath(ns->head)) {
 		blk_mq_freeze_queue(ns->head->disk->queue);
-		nvme_update_disk_info(ns->ctrl, ns->head->disk, ns->head, id);
+		nvme_init_integrity(ns->head->disk, ns->head);
+		set_capacity_and_notify(ns->head->disk, get_capacity(ns->disk));
 		set_disk_ro(ns->head->disk, nvme_ns_is_readonly(ns, info));
 		nvme_mpath_revalidate_paths(ns);
 		blk_stack_limits(&ns->head->disk->queue->limits,