btrfs-progs: remove comments about delayed ref in backref.c

There is no delayed ref in btrfs-progs, so remove related comments.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 3 insertions, 16 deletions

diff --git a/backref.c b/backref.c
index 27309e07..c144dbf0 100644
--- a/backref.c
+++ b/backref.c
@@ -155,19 +155,6 @@ static void init_pref_state(struct pref_state *prefstate)
  * - if you cannot add the parent or a correct key, then we will look into the
  *   block later to set a correct key
  *
- * delayed refs
- * ============
- *        backref type | shared | indirect | shared | indirect
- * information         |   tree |     tree |   data |     data
- * --------------------+--------+----------+--------+----------
- *      parent logical |    y   |     -    |    -   |     -
- *      key to resolve |    -   |     y    |    y   |     y
- *  tree block logical |    -   |     -    |    -   |     -
- *  root for resolving |    y   |     y    |    y   |     y
- *
- * - column 1:       we've the parent -> done
- * - column 2, 3, 4: we use the key to find the parent
- *
  * on disk refs (inline or keyed)
  * ==============================
  *        backref type | shared | indirect | shared | indirect
@@ -735,9 +722,9 @@ static int __add_keyed_refs(struct btrfs_fs_info *fs_info,
 }
 
 /*
- * this adds all existing backrefs (inline backrefs, backrefs and delayed
- * refs) for the given bytenr to the refs list, merges duplicates and resolves
- * indirect refs to their parent bytenr.
+ * this adds all existing backrefs (inline backrefs, backrefs for the given
+ * bytenr to the refs list, merges duplicates and resolves indirect refs to
+ * their parent bytenr.
  * When roots are found, they're added to the roots list
  *
  * FIXME some caching might speed things up