444 					struct dm_snapshot **snap_src,  in __find_snapshots_sharing_cow()  argument
468 			if (snap_src)  in __find_snapshots_sharing_cow()
469 				*snap_src = s;  in __find_snapshots_sharing_cow()
486 	struct dm_snapshot *snap_src = NULL, *snap_dest = NULL;  in __validate_exception_handover()  local
490 	if ((__find_snapshots_sharing_cow(snap, &snap_src, &snap_dest,  in __validate_exception_handover()
502 	if (!snap_src)  in __validate_exception_handover()
519 	if (!snap_src->store->type->prepare_merge ||  in __validate_exception_handover()
520 	    !snap_src->store->type->commit_merge) {  in __validate_exception_handover()
1436 static void __handover_exceptions(struct dm_snapshot *snap_src,  in __handover_exceptions()  argument
1448 	snap_dest->complete = snap_src->complete;  in __handover_exceptions()
1449 	snap_src->complete = u.table_swap;  in __handover_exceptions()
1452 	snap_dest->store = snap_src->store;  in __handover_exceptions()
1454 	snap_src->store = u.store_swap;  in __handover_exceptions()
1457 	snap_src->store->snap = snap_src;  in __handover_exceptions()
1460 	snap_dest->valid = snap_src->valid;  in __handover_exceptions()
1461 	snap_dest->snapshot_overflowed = snap_src->snapshot_overflowed;  in __handover_exceptions()
1466 	snap_src->valid = 0;  in __handover_exceptions()
1475 	struct dm_snapshot *snap_src = NULL, *snap_dest = NULL;  in snapshot_dtr()  local
1479 	(void) __find_snapshots_sharing_cow(s, &snap_src, &snap_dest, NULL);  in snapshot_dtr()
1480 	if (snap_src && snap_dest && (s == snap_src)) {  in snapshot_dtr()
2204 	struct dm_snapshot *snap_src = NULL, *snap_dest = NULL;  in snapshot_preresume()  local
2207 	(void) __find_snapshots_sharing_cow(s, &snap_src, &snap_dest, NULL);  in snapshot_preresume()
2208 	if (snap_src && snap_dest) {  in snapshot_preresume()
2209 		down_read(&snap_src->lock);  in snapshot_preresume()
2210 		if (s == snap_src) {  in snapshot_preresume()
2214 		} else if (!dm_suspended(snap_src->ti)) {  in snapshot_preresume()
2219 		up_read(&snap_src->lock);  in snapshot_preresume()
2229 	struct dm_snapshot *snap_src = NULL, *snap_dest = NULL, *snap_merging = NULL;  in snapshot_resume()  local
2263 	(void) __find_snapshots_sharing_cow(s, &snap_src, &snap_dest, NULL);  in snapshot_resume()
2264 	if (snap_src && snap_dest) {  in snapshot_resume()
2265 		down_write(&snap_src->lock);  in snapshot_resume()
2267 		__handover_exceptions(snap_src, snap_dest);  in snapshot_resume()
2269 		up_write(&snap_src->lock);  in snapshot_resume()
2406 		struct dm_snapshot *snap_src = NULL, *snap_dest = NULL;  in snapshot_io_hints()  local
2410 		(void) __find_snapshots_sharing_cow(snap, &snap_src, &snap_dest, NULL);  in snapshot_io_hints()
2411 		if (snap_src && snap_dest)  in snapshot_io_hints()
2412 			snap = snap_src;  in snapshot_io_hints()