btrfs: qgroup: Finish rescan when hit the last leaf of extent tree
[sfrench/cifs-2.6.git] / fs / btrfs / qgroup.c
index 641ef2679bb1832891990fdf75e17afc92a28c38..457219d6a16b6b7ced8c4a1993123c7846377bc5 100644 (file)
@@ -2579,6 +2579,21 @@ out:
        spin_unlock(&fs_info->qgroup_lock);
 }
 
+/*
+ * Check if the leaf is the last leaf. Which means all node pointers
+ * are at their last position.
+ */
+static bool is_last_leaf(struct btrfs_path *path)
+{
+       int i;
+
+       for (i = 1; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) {
+               if (path->slots[i] != btrfs_header_nritems(path->nodes[i]) - 1)
+                       return false;
+       }
+       return true;
+}
+
 /*
  * returns < 0 on error, 0 when more leafs are to be scanned.
  * returns 1 when done.
@@ -2591,6 +2606,7 @@ qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
        struct extent_buffer *scratch_leaf = NULL;
        struct ulist *roots = NULL;
        u64 num_bytes;
+       bool done;
        int slot;
        int ret;
 
@@ -2619,6 +2635,7 @@ qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
                mutex_unlock(&fs_info->qgroup_rescan_lock);
                return ret;
        }
+       done = is_last_leaf(path);
 
        btrfs_item_key_to_cpu(path->nodes[0], &found,
                              btrfs_header_nritems(path->nodes[0]) - 1);
@@ -2663,6 +2680,8 @@ out:
                free_extent_buffer(scratch_leaf);
        }
 
+       if (done && !ret)
+               ret = 1;
        return ret;
 }