9557 			struct extent_map_tree *em_tree;  in find_first_block_group()  local
9560 			em_tree = &root->fs_info->mapping_tree.map_tree;  in find_first_block_group()
9561 			read_lock(&em_tree->lock);  in find_first_block_group()
9562 			em = lookup_extent_mapping(em_tree, found_key.objectid,  in find_first_block_group()
9564 			read_unlock(&em_tree->lock);  in find_first_block_group()
10459 		struct extent_map_tree *em_tree;  in btrfs_remove_block_group()  local
10461 		em_tree = &fs_info->mapping_tree.map_tree;  in btrfs_remove_block_group()
10462 		write_lock(&em_tree->lock);  in btrfs_remove_block_group()
10468 		remove_extent_mapping(em_tree, em);  in btrfs_remove_block_group()
10469 		write_unlock(&em_tree->lock);  in btrfs_remove_block_group()
10499 	struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree;  in btrfs_start_trans_remove_block_group()  local
10504 	read_lock(&em_tree->lock);  in btrfs_start_trans_remove_block_group()
10505 	em = lookup_extent_mapping(em_tree, chunk_offset, 1);  in btrfs_start_trans_remove_block_group()
10506 	read_unlock(&em_tree->lock);  in btrfs_start_trans_remove_block_group()