block: remove per-queue plugging

Code has been converted over to the new explicit on-stack plugging,
and delay users have been converted to use the new API for that.
So lets kill off the old plugging along with aops->sync_page().

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

fs/nilfs2/page.c

@@ -506,15 +506,14 @@ void nilfs_mapping_init_once(struct address_space *mapping)
 }
 
 void nilfs_mapping_init(struct address_space *mapping,
-			struct backing_dev_info *bdi,
-			const struct address_space_operations *aops)
+			struct backing_dev_info *bdi)
 {
 	mapping->host = NULL;
 	mapping->flags = 0;
 	mapping_set_gfp_mask(mapping, GFP_NOFS);
 	mapping->assoc_mapping = NULL;
 	mapping->backing_dev_info = bdi;
-	mapping->a_ops = aops;
+	mapping->a_ops = NULL;
 }
 
 /*