btrfs: free PERTRANS at the end of cleanup_transaction()

Some of the operations after the free might convert more PERTRANS
metadata. Do the freeing as late as possible to eliminate a source of
leaked PERTRANS metadata.

This helps with the pass rate of generic/269 and generic/475.
Reviewed-by: Qu Wenruo <qwu@suse.com>
Signed-off-by: Boris Burkov <boris@bur.io>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/disk-io.c

@@ -4844,14 +4844,10 @@ void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
 	cur_trans->state = TRANS_STATE_UNBLOCKED;
 	wake_up(&fs_info->transaction_wait);
 
-	btrfs_destroy_delayed_inodes(fs_info);
-
 	btrfs_destroy_marked_extents(fs_info, &cur_trans->dirty_pages,
 				     EXTENT_DIRTY);
 	btrfs_destroy_pinned_extent(fs_info, &cur_trans->pinned_extents);
 
-	btrfs_free_all_qgroup_pertrans(fs_info);
-
 	cur_trans->state =TRANS_STATE_COMPLETED;
 	wake_up(&cur_trans->commit_wait);
 }
@@ -4904,6 +4900,7 @@ static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info)
 	btrfs_assert_delayed_root_empty(fs_info);
 	btrfs_destroy_all_delalloc_inodes(fs_info);
 	btrfs_drop_all_logs(fs_info);
+	btrfs_free_all_qgroup_pertrans(fs_info);
 	mutex_unlock(&fs_info->transaction_kthread_mutex);
 
 	return 0;