1 files changed, 12 insertions, 1 deletions

diff --git a/fs/btrfs/debug-tree.c b/fs/btrfs/debug-tree.c
index d9f36efc3dd1..fd07969600c6 100644
--- a/fs/btrfs/debug-tree.c
+++ b/fs/btrfs/debug-tree.c
@@ -10,8 +10,17 @@
 int main(int ac, char **av) {
         struct btrfs_super_block super;
         struct btrfs_root *root;
+
+        if (ac != 2) {
+                fprintf(stderr, "usage: %s device\n", av[0]);
+                exit(1);
+        }
         radix_tree_init();
-        root = open_ctree("dbfile", &super);
+        root = open_ctree(av[1], &super);
+        if (!root) {
+                fprintf(stderr, "unable to open %s\n", av[1]);
+                exit(1);
+        }
         printf("fs tree\n");
         btrfs_print_tree(root, root->node);
         printf("map tree\n");
@@ -23,5 +32,7 @@ int main(int ac, char **av) {
         printf("root tree\n");
         btrfs_print_tree(root->fs_info->tree_root,
                          root->fs_info->tree_root->node);
+        printf("total blocks %Lu\n", btrfs_super_total_blocks(&super));
+        printf("blocks used %Lu\n", btrfs_super_blocks_used(&super));
         return 0;
 }