326 	struct dm_bio_prison_cell *old_ocell;  member
927 		cell_defer(cache, mg->old_ocell, false);  in migration_failure()
933 		cell_defer(cache, mg->old_ocell, mg->promote ? false : true);  in migration_failure()
952 		cell_defer(cache, mg->old_ocell, false);  in migration_success_pre_commit()
991 		cell_defer(cache, mg->old_ocell, mg->promote ? false : true);  in migration_success_post_commit()
1266 	mg->old_ocell = NULL;  in promote()
1290 	mg->old_ocell = cell;  in writeback()
1301 				struct dm_bio_prison_cell *old_ocell,  in demote_then_promote()  argument
1317 	mg->old_ocell = old_ocell;  in demote_then_promote()
1345 	mg->old_ocell = cell;  in invalidate()
1366 	mg->old_ocell = NULL;  in discard()
1687 	struct dm_bio_prison_cell *old_ocell;  in writeback_some_dirty_blocks()  local
1699 		r = get_cell(cache, oblock, &structs, &old_ocell);  in writeback_some_dirty_blocks()
1705 		writeback(cache, &structs, oblock, cblock, old_ocell);  in writeback_some_dirty_blocks()