drbd: merge drbd_setup_queue_param into drbd_reconsider_queue_parameters

drbd_setup_queue_param is only called by drbd_reconsider_queue_parameters
and there is no really clear boundary of responsibilities between the
two.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Philipp Reisner <philipp.reisner@linbit.com>
Reviewed-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Tested-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
Link: https://lore.kernel.org/r/20240306140332.623759-5-philipp.reisner@linbit.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Christoph Hellwig

drivers/block/drbd/drbd_nl.c

@@ -1309,45 +1309,16 @@ static unsigned int drbd_backing_dev_max_segments(struct drbd_device *device)
 	return max_segments;
 }
 
-static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backing_dev *bdev,
-				   unsigned int max_bio_size, struct o_qlim *o)
-{
-	struct request_queue * const q = device->rq_queue;
-	unsigned int max_hw_sectors = max_bio_size >> 9;
-	unsigned int max_segments = BLK_MAX_SEGMENTS;
-	struct request_queue *b = NULL;
-
-	if (bdev) {
-		b = bdev->backing_bdev->bd_disk->queue;
-
-		max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
-		max_segments = drbd_backing_dev_max_segments(device);
-
-		blk_set_stacking_limits(&q->limits);
-	}
-
-	blk_queue_max_hw_sectors(q, max_hw_sectors);
-	blk_queue_max_segments(q, max_segments);
-	blk_queue_segment_boundary(q, PAGE_SIZE-1);
-	decide_on_discard_support(device, bdev);
-
-	if (b) {
-		blk_stack_limits(&q->limits, &b->limits, 0);
-		disk_update_readahead(device->vdisk);
-	}
-	fixup_write_zeroes(device, q);
-	fixup_discard_support(device, q);
-}
-
 void drbd_reconsider_queue_parameters(struct drbd_device *device,
 		struct drbd_backing_dev *bdev, struct o_qlim *o)
 {
-	unsigned int now = queue_max_hw_sectors(device->rq_queue) <<
-			SECTOR_SHIFT;
+	struct request_queue * const q = device->rq_queue;
+	unsigned int now = queue_max_hw_sectors(q) << 9;
+	struct request_queue *b = NULL;
 	unsigned int new;
 
 	if (bdev) {
-		struct request_queue *b = bdev->backing_bdev->bd_disk->queue;
+		b = bdev->backing_bdev->bd_disk->queue;
 
 		device->local_max_bio_size =
 			queue_max_hw_sectors(b) << SECTOR_SHIFT;
@@ -1369,7 +1340,24 @@ void drbd_reconsider_queue_parameters(struct drbd_device *device,
 		drbd_info(device, "max BIO size = %u\n", new);
 	}
 
-	drbd_setup_queue_param(device, bdev, new, o);
+	if (bdev) {
+		blk_set_stacking_limits(&q->limits);
+		blk_queue_max_segments(q,
+			drbd_backing_dev_max_segments(device));
+	} else {
+		blk_queue_max_segments(q, BLK_MAX_SEGMENTS);
+	}
+
+	blk_queue_max_hw_sectors(q, new >> SECTOR_SHIFT);
+	blk_queue_segment_boundary(q, PAGE_SIZE - 1);
+	decide_on_discard_support(device, bdev);
+
+	if (bdev) {
+		blk_stack_limits(&q->limits, &b->limits, 0);
+		disk_update_readahead(device->vdisk);
+	}
+	fixup_write_zeroes(device, q);
+	fixup_discard_support(device, q);
 }
 
 /* Starts the worker thread */