btrfs: expose internal free space tree routine only if sanity tests are enabled

The internal free space tree management routines are always exposed for
testing purposes. Make them dependent on SANITY_TESTS being on so that
they are exposed only when they really have to.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/free-space-tree.h

@@ -44,7 +44,7 @@ int remove_from_free_space_tree(struct btrfs_trans_handle *trans,
 				struct btrfs_fs_info *fs_info,
 				u64 start, u64 size);
 
-/* Exposed for testing. */
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 struct btrfs_free_space_info *
 search_free_space_info(struct btrfs_trans_handle *trans,
 		       struct btrfs_fs_info *fs_info,
@@ -68,5 +68,6 @@ int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
 				  struct btrfs_path *path);
 int free_space_test_bit(struct btrfs_block_group_cache *block_group,
 			struct btrfs_path *path, u64 offset);
+#endif
 
 #endif