889 	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;  in check_defrag_in_cache()  local
892 	read_lock(&em_tree->lock);  in check_defrag_in_cache()
893 	em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);  in check_defrag_in_cache()
894 	read_unlock(&em_tree->lock);  in check_defrag_in_cache()
980 	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;  in defrag_lookup_extent()  local
989 	read_lock(&em_tree->lock);  in defrag_lookup_extent()
990 	em = lookup_extent_mapping(em_tree, start, len);  in defrag_lookup_extent()
991 	read_unlock(&em_tree->lock);  in defrag_lookup_extent()
3122 	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;  in clone_update_extent_map()  local
3157 		write_lock(&em_tree->lock);  in clone_update_extent_map()
3158 		ret = add_extent_mapping(em_tree, em, 1);  in clone_update_extent_map()
3159 		write_unlock(&em_tree->lock);  in clone_update_extent_map()