182 	struct dm_snapshot *snap;  member
416 static int __find_snapshots_sharing_cow(struct dm_snapshot *snap,  in __find_snapshots_sharing_cow()  argument
426 	o = __lookup_origin(snap->origin->bdev);  in __find_snapshots_sharing_cow()
433 		if (!bdev_equal(s->cow->bdev, snap->cow->bdev))  in __find_snapshots_sharing_cow()
457 static int __validate_exception_handover(struct dm_snapshot *snap)  in __validate_exception_handover()  argument
463 	if ((__find_snapshots_sharing_cow(snap, &snap_src, &snap_dest,  in __validate_exception_handover()
466 		snap->ti->error = "Snapshot cow pairing for exception "  in __validate_exception_handover()
481 	if (!dm_target_is_snapshot_merge(snap->ti))  in __validate_exception_handover()
488 		snap->ti->error = "A snapshot is already merging.";  in __validate_exception_handover()
494 		snap->ti->error = "Snapshot exception store does not "  in __validate_exception_handover()
521 static int register_snapshot(struct dm_snapshot *snap)  in register_snapshot()  argument
524 	struct block_device *bdev = snap->origin->bdev;  in register_snapshot()
533 	r = __validate_exception_handover(snap);  in register_snapshot()
553 	__insert_snapshot(o, snap);  in register_snapshot()
683 	pe->snap = s;  in alloc_pending_exception()
690 	struct dm_snapshot *s = pe->snap;  in free_pending_exception()
768 	struct dm_snapshot *snap;  in __minimum_chunk_size()  local
772 		list_for_each_entry(snap, &o->snapshots, list)  in __minimum_chunk_size()
774 						  snap->store->chunk_size);  in __minimum_chunk_size()
1299 	snap_dest->store->snap = snap_dest;  in __handover_exceptions()
1300 	snap_src->store->snap = snap_src;  in __handover_exceptions()
1435 	struct dm_snapshot *s = pe->snap;  in pending_complete()
1506 	struct dm_snapshot *s = pe->snap;  in complete_exception()
1520 	struct dm_snapshot *s = pe->snap;  in copy_callback()
1555 	struct dm_snapshot *s = pe->snap;  in start_copy()
1584 	struct dm_snapshot *s = pe->snap;  in start_full_bio()
1973 	struct dm_snapshot *snap = ti->private;  in snapshot_status()  local
1978 		down_write(&snap->lock);  in snapshot_status()
1980 		if (!snap->valid)  in snapshot_status()
1982 		else if (snap->merge_failed)  in snapshot_status()
1985 			if (snap->store->type->usage) {  in snapshot_status()
1988 				snap->store->type->usage(snap->store,  in snapshot_status()
2001 		up_write(&snap->lock);  in snapshot_status()
2011 		DMEMIT("%s %s", snap->origin->name, snap->cow->name);  in snapshot_status()
2012 		snap->store->type->status(snap->store, type, result + sz,  in snapshot_status()
2021 	struct dm_snapshot *snap = ti->private;  in snapshot_iterate_devices()  local
2024 	r = fn(ti, snap->origin, 0, ti->len, data);  in snapshot_iterate_devices()
2027 		r = fn(ti, snap->cow, 0, get_dev_size(snap->cow->bdev), data);  in snapshot_iterate_devices()
2051 	struct dm_snapshot *snap;  in __origin_write()  local
2059 	list_for_each_entry (snap, snapshots, list) {  in __origin_write()
2064 		if (dm_target_is_snapshot_merge(snap->ti))  in __origin_write()
2067 		down_write(&snap->lock);  in __origin_write()
2070 		if (!snap->valid || !snap->active)  in __origin_write()
2074 		if (sector >= dm_table_get_size(snap->ti->table))  in __origin_write()
2081 		chunk = sector_to_chunk(snap->store, sector);  in __origin_write()
2088 		e = dm_lookup_exception(&snap->complete, chunk);  in __origin_write()
2092 		pe = __lookup_pending_exception(snap, chunk);  in __origin_write()
2094 			up_write(&snap->lock);  in __origin_write()
2095 			pe = alloc_pending_exception(snap);  in __origin_write()
2096 			down_write(&snap->lock);  in __origin_write()
2098 			if (!snap->valid) {  in __origin_write()
2103 			e = dm_lookup_exception(&snap->complete, chunk);  in __origin_write()
2109 			pe = __find_pending_exception(snap, pe, chunk);  in __origin_write()
2111 				__invalidate_snapshot(snap, -ENOMEM);  in __origin_write()
2139 		up_write(&snap->lock);  in __origin_write()