--- zzzz-none-000/linux-3.10.107/fs/btrfs/tree-defrag.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/fs/btrfs/tree-defrag.c	2021-02-04 17:41:59.000000000 +0000
@@ -37,7 +37,6 @@
 	int ret = 0;
 	int wret;
 	int level;
-	int is_extent = 0;
 	int next_key_ret = 0;
 	u64 last_ret = 0;
 	u64 min_trans = 0;
@@ -50,10 +49,7 @@
 		goto out;
 	}
 
-	if (root->ref_cows == 0 && !is_extent)
-		goto out;
-
-	if (btrfs_test_opt(root, SSD))
+	if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
 		goto out;
 
 	path = btrfs_alloc_path();
@@ -85,7 +81,7 @@
 
 	path->keep_locks = 1;
 
-	ret = btrfs_search_forward(root, &key, NULL, path, min_trans);
+	ret = btrfs_search_forward(root, &key, path, min_trans);
 	if (ret < 0)
 		goto out;
 	if (ret > 0) {
@@ -119,8 +115,7 @@
 		ret = -EAGAIN;
 	}
 out:
-	if (path)
-		btrfs_free_path(path);
+	btrfs_free_path(path);
 	if (ret == -EAGAIN) {
 		if (root->defrag_max.objectid > root->defrag_progress.objectid)
 			goto done;