btrfs: fix delayed_node ref_tracker use after free

Move the print before releasing the delayed node.

In my initial testing there was a bug that was causing delayed_nodes
to not get freed which is why I put the print after the release. This
obviously neglects the case where the delayed node is properly freed.

Add condition to make sure we only print if we have more than one
reference to the delayed_node to prevent printing when we only have
the reference taken in btrfs_kill_all_delayed_nodes().

Fixes: b767a28d6154 ("btrfs: print leaked references in kill_all_delayed_nodes()")
Tested-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Leo Martins <[e-mail]>
Reviewed-by: David Sterba <[e-mail]>
Signed-off-by: David Sterba <[e-mail]>

fs/btrfs/delayed-inode.c

···
 
 		for (int i = 0; i < count; i++) {
 			__btrfs_kill_delayed_node(delayed_nodes[i]);
+			btrfs_delayed_node_ref_tracker_dir_print(delayed_nodes[i]);
 			btrfs_release_delayed_node(delayed_nodes[i],
 						   &delayed_node_trackers[i]);
-			btrfs_delayed_node_ref_tracker_dir_print(delayed_nodes[i]);
 		}
 	}
 }

fs/btrfs/delayed-inode.h

···
 	if (!btrfs_test_opt(node->root->fs_info, REF_TRACKER))
 		return;
 
+	/*
+	 * Only print if there are leaked references. The caller is
+	 * holding one reference, so if refs == 1 there is no leak.
+	 */
+	if (refcount_read(&node->refs) == 1)
+		return;
+
 	ref_tracker_dir_print(&node->ref_dir.dir,
 			      BTRFS_DELAYED_NODE_REF_TRACKER_DISPLAY_LIMIT);
 }