md/md-bitmap: merge md_bitmap_flush() into bitmap_operations

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20240826074452.1490072-17-yukuai1@huaweicloud.comSigned-off-by: Song Liu <song@kernel.org>

drivers/md/md-bitmap.c

@@ -1773,10 +1773,7 @@ void md_bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long
 	}
 }
 
-/*
- * flush out any pending updates
- */
-void md_bitmap_flush(struct mddev *mddev)
+static void bitmap_flush(struct mddev *mddev)
 {
 	struct bitmap *bitmap = mddev->bitmap;
 	long sleep;
@@ -2725,6 +2722,7 @@ static struct bitmap_operations bitmap_ops = {
 	.create			= bitmap_create,
 	.load			= bitmap_load,
 	.destroy		= bitmap_destroy,
+	.flush			= bitmap_flush,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)

drivers/md/md-bitmap.h

@@ -250,13 +250,13 @@ struct bitmap_operations {
 	int (*create)(struct mddev *mddev, int slot);
 	int (*load)(struct mddev *mddev);
 	void (*destroy)(struct mddev *mddev);
+	void (*flush)(struct mddev *mddev);
 };
 
 /* the bitmap API */
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
-void md_bitmap_flush(struct mddev *mddev);
 
 void md_bitmap_print_sb(struct bitmap *bitmap);
 void md_bitmap_update_sb(struct bitmap *bitmap);

drivers/md/md.c

@@ -6463,7 +6463,8 @@ static void __md_stop_writes(struct mddev *mddev)
 		mddev->pers->quiesce(mddev, 1);
 		mddev->pers->quiesce(mddev, 0);
 	}
-	md_bitmap_flush(mddev);
+
+	mddev->bitmap_ops->flush(mddev);
 
 	if (md_is_rdwr(mddev) &&
 	    ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||