Btrfs: Add back pointers from extents to the btree or file referencing them

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index 030324febf6c..da0b4dcf3617 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -33,6 +33,7 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
         struct btrfs_file_extent_item *fi;
         struct btrfs_key key;
         struct btrfs_key found_key;
+        struct btrfs_extent_ref *ref;
         u32 type;
 
         printk("leaf %llu total ptrs %d free space %d\n",
@@ -73,6 +74,15 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
                         printk("\t\textent data refs %u\n",
                                 btrfs_extent_refs(l, ei));
                         break;
+                case BTRFS_EXTENT_REF_KEY:
+                        ref = btrfs_item_ptr(l, i, struct btrfs_extent_ref);
+                        printk("\t\textent back ref root %llu gen %llu "
+                               "owner %llu offset %llu\n",
+                               (unsigned long long)btrfs_ref_root(l, ref),
+                               (unsigned long long)btrfs_ref_generation(l, ref),
+                               (unsigned long long)btrfs_ref_objectid(l, ref),
+                               (unsigned long long)btrfs_ref_offset(l, ref));
+                        break;
 
                 case BTRFS_EXTENT_DATA_KEY:
                         fi = btrfs_item_ptr(l, i,