6956 	struct extent_map_tree *map_tree = &fs_info->mapping_tree;  in read_one_chunk()  local
6990 	read_lock(&map_tree->lock);  in read_one_chunk()
6991 	em = lookup_extent_mapping(map_tree, logical, 1);  in read_one_chunk()
6992 	read_unlock(&map_tree->lock);  in read_one_chunk()
7061 	write_lock(&map_tree->lock);  in read_one_chunk()
7062 	ret = add_extent_mapping(map_tree, em, 0);  in read_one_chunk()
7063 	write_unlock(&map_tree->lock);  in read_one_chunk()
7391 	struct extent_map_tree *map_tree = &fs_info->mapping_tree;  in btrfs_check_rw_degradable()  local
7396 	read_lock(&map_tree->lock);  in btrfs_check_rw_degradable()
7397 	em = lookup_extent_mapping(map_tree, 0, (u64)-1);  in btrfs_check_rw_degradable()
7398 	read_unlock(&map_tree->lock);  in btrfs_check_rw_degradable()
7436 		read_lock(&map_tree->lock);  in btrfs_check_rw_degradable()
7437 		em = lookup_extent_mapping(map_tree, next_start,  in btrfs_check_rw_degradable()
7439 		read_unlock(&map_tree->lock);  in btrfs_check_rw_degradable()