[PATCH] Btrfs: fix qgroup sanity tests

[Josef Bacik <jbacik@fb.com>]

With my changes to allow us to find old roots when resolving indirect refs I
introduced a regression to the sanity tests.  Since we don't really care to go
down into the fs roots we just need to have the old behavior of returning ENOENT
for dummy roots for the sanity tests.  In the future if we want to get fancy we
can populate the test fs trees with the references as well.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
---
 fs/btrfs/backref.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 5de66e9..905d697 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -339,6 +339,13 @@ static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
 		goto out;
 	}
 
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
+	if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state))) {
+		srcu_read_unlock(&fs_info->subvol_srcu, index);
+		ret = -ENOENT;
+		goto out;
+	}
+#endif
 	if (path->search_commit_root)
 		root_level = btrfs_header_level(root->commit_root);
 	else if (time_seq == (u64)-1)
-- 
1.8.3.1