189 	struct dm_snapshot *snap;  member
423 static int __find_snapshots_sharing_cow(struct dm_snapshot *snap,  in __find_snapshots_sharing_cow()  argument
433 	o = __lookup_origin(snap->origin->bdev);  in __find_snapshots_sharing_cow()
440 		if (!bdev_equal(s->cow->bdev, snap->cow->bdev))  in __find_snapshots_sharing_cow()
464 static int __validate_exception_handover(struct dm_snapshot *snap)  in __validate_exception_handover()  argument
470 	if ((__find_snapshots_sharing_cow(snap, &snap_src, &snap_dest,  in __validate_exception_handover()
473 		snap->ti->error = "Snapshot cow pairing for exception "  in __validate_exception_handover()
488 	if (!dm_target_is_snapshot_merge(snap->ti))  in __validate_exception_handover()
495 		snap->ti->error = "A snapshot is already merging.";  in __validate_exception_handover()
501 		snap->ti->error = "Snapshot exception store does not "  in __validate_exception_handover()
528 static int register_snapshot(struct dm_snapshot *snap)  in register_snapshot()  argument
531 	struct block_device *bdev = snap->origin->bdev;  in register_snapshot()
540 	r = __validate_exception_handover(snap);  in register_snapshot()
560 	__insert_snapshot(o, snap);  in register_snapshot()
690 	pe->snap = s;  in alloc_pending_exception()
697 	struct dm_snapshot *s = pe->snap;  in free_pending_exception()
775 	struct dm_snapshot *snap;  in __minimum_chunk_size()  local
779 		list_for_each_entry(snap, &o->snapshots, list)  in __minimum_chunk_size()
781 						  snap->store->chunk_size);  in __minimum_chunk_size()
1317 	snap_dest->store->snap = snap_dest;  in __handover_exceptions()
1318 	snap_src->store->snap = snap_src;  in __handover_exceptions()
1454 	struct dm_snapshot *s = pe->snap;  in pending_complete()
1524 	struct dm_snapshot *s = pe->snap;  in complete_exception()
1538 	struct dm_snapshot *s = pe->snap;  in copy_callback()
1573 	struct dm_snapshot *s = pe->snap;  in start_copy()
1602 	struct dm_snapshot *s = pe->snap;  in start_full_bio()
1995 	struct dm_snapshot *snap = ti->private;  in snapshot_status()  local
2000 		down_write(&snap->lock);  in snapshot_status()
2002 		if (!snap->valid)  in snapshot_status()
2004 		else if (snap->merge_failed)  in snapshot_status()
2006 		else if (snap->snapshot_overflowed)  in snapshot_status()
2009 			if (snap->store->type->usage) {  in snapshot_status()
2012 				snap->store->type->usage(snap->store,  in snapshot_status()
2025 		up_write(&snap->lock);  in snapshot_status()
2035 		DMEMIT("%s %s", snap->origin->name, snap->cow->name);  in snapshot_status()
2036 		snap->store->type->status(snap->store, type, result + sz,  in snapshot_status()
2045 	struct dm_snapshot *snap = ti->private;  in snapshot_iterate_devices()  local
2048 	r = fn(ti, snap->origin, 0, ti->len, data);  in snapshot_iterate_devices()
2051 		r = fn(ti, snap->cow, 0, get_dev_size(snap->cow->bdev), data);  in snapshot_iterate_devices()
2075 	struct dm_snapshot *snap;  in __origin_write()  local
2083 	list_for_each_entry (snap, snapshots, list) {  in __origin_write()
2088 		if (dm_target_is_snapshot_merge(snap->ti))  in __origin_write()
2091 		down_write(&snap->lock);  in __origin_write()
2094 		if (!snap->valid || !snap->active)  in __origin_write()
2098 		if (sector >= dm_table_get_size(snap->ti->table))  in __origin_write()
2105 		chunk = sector_to_chunk(snap->store, sector);  in __origin_write()
2112 		e = dm_lookup_exception(&snap->complete, chunk);  in __origin_write()
2116 		pe = __lookup_pending_exception(snap, chunk);  in __origin_write()
2118 			up_write(&snap->lock);  in __origin_write()
2119 			pe = alloc_pending_exception(snap);  in __origin_write()
2120 			down_write(&snap->lock);  in __origin_write()
2122 			if (!snap->valid) {  in __origin_write()
2127 			e = dm_lookup_exception(&snap->complete, chunk);  in __origin_write()
2133 			pe = __find_pending_exception(snap, pe, chunk);  in __origin_write()
2135 				__invalidate_snapshot(snap, -ENOMEM);  in __origin_write()
2163 		up_write(&snap->lock);  in __origin_write()