890 	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;  in check_defrag_in_cache()  local
893 	read_lock(&em_tree->lock);  in check_defrag_in_cache()
894 	em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);  in check_defrag_in_cache()
895 	read_unlock(&em_tree->lock);  in check_defrag_in_cache()
981 	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;  in defrag_lookup_extent()  local
990 	read_lock(&em_tree->lock);  in defrag_lookup_extent()
991 	em = lookup_extent_mapping(em_tree, start, len);  in defrag_lookup_extent()
992 	read_unlock(&em_tree->lock);  in defrag_lookup_extent()
3321 	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;  in clone_update_extent_map()  local
3356 		write_lock(&em_tree->lock);  in clone_update_extent_map()
3357 		ret = add_extent_mapping(em_tree, em, 1);  in clone_update_extent_map()
3358 		write_unlock(&em_tree->lock);  in clone_update_extent_map()