+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or https://opensource.org/licenses/CDDL-1.0.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016 by Delphix. All rights reserved.
+ * Copyright (c) 2023, Klara Inc.
+ */
+
+#ifndef _SYS_DDT_IMPL_H
+#define _SYS_DDT_IMPL_H
+
+#include <sys/ddt.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Ops vector to access a specific DDT object type.
+ */
+typedef struct ddt_ops {
+ char ddt_op_name[32];
+ int (*ddt_op_create)(objset_t *os, uint64_t *object, dmu_tx_t *tx,
+ boolean_t prehash);
+ int (*ddt_op_destroy)(objset_t *os, uint64_t object, dmu_tx_t *tx);
+ int (*ddt_op_lookup)(objset_t *os, uint64_t object, ddt_entry_t *dde);
+ void (*ddt_op_prefetch)(objset_t *os, uint64_t object,
+ ddt_entry_t *dde);
+ int (*ddt_op_update)(objset_t *os, uint64_t object, ddt_entry_t *dde,
+ dmu_tx_t *tx);
+ int (*ddt_op_remove)(objset_t *os, uint64_t object, ddt_entry_t *dde,
+ dmu_tx_t *tx);
+ int (*ddt_op_walk)(objset_t *os, uint64_t object, ddt_entry_t *dde,
+ uint64_t *walk);
+ int (*ddt_op_count)(objset_t *os, uint64_t object, uint64_t *count);
+} ddt_ops_t;
+
+extern const ddt_ops_t ddt_zap_ops;
+
+extern void ddt_stat_update(ddt_t *ddt, ddt_entry_t *dde, uint64_t neg);
+
+/*
+ * These are only exposed so that zdb can access them. Try not to use them
+ * outside of the DDT implementation proper, and if you do, consider moving
+ * them up.
+ */
+#define DDT_NAMELEN 107
+
+extern uint64_t ddt_phys_total_refcnt(const ddt_entry_t *dde);
+
+extern void ddt_key_fill(ddt_key_t *ddk, const blkptr_t *bp);
+
+extern void ddt_stat_add(ddt_stat_t *dst, const ddt_stat_t *src, uint64_t neg);
+
+extern void ddt_object_name(ddt_t *ddt, enum ddt_type type,
+ enum ddt_class clazz, char *name);
+extern int ddt_object_walk(ddt_t *ddt, enum ddt_type type,
+ enum ddt_class clazz, uint64_t *walk, ddt_entry_t *dde);
+extern int ddt_object_count(ddt_t *ddt, enum ddt_type type,
+ enum ddt_class clazz, uint64_t *count);
+extern int ddt_object_info(ddt_t *ddt, enum ddt_type type,
+ enum ddt_class clazz, dmu_object_info_t *);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_DDT_H */