xref: /illumos-gate/usr/src/uts/common/fs/zfs/ddt.c (revision 9eb19f4d61679ca0382def038665019234458edd)
1b24ab676SJeff Bonwick /*
2b24ab676SJeff Bonwick  * CDDL HEADER START
3b24ab676SJeff Bonwick  *
4b24ab676SJeff Bonwick  * The contents of this file are subject to the terms of the
5b24ab676SJeff Bonwick  * Common Development and Distribution License (the "License").
6b24ab676SJeff Bonwick  * You may not use this file except in compliance with the License.
7b24ab676SJeff Bonwick  *
8b24ab676SJeff Bonwick  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9b24ab676SJeff Bonwick  * or http://www.opensolaris.org/os/licensing.
10b24ab676SJeff Bonwick  * See the License for the specific language governing permissions
11b24ab676SJeff Bonwick  * and limitations under the License.
12b24ab676SJeff Bonwick  *
13b24ab676SJeff Bonwick  * When distributing Covered Code, include this CDDL HEADER in each
14b24ab676SJeff Bonwick  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15b24ab676SJeff Bonwick  * If applicable, add the following below this CDDL HEADER, with the
16b24ab676SJeff Bonwick  * fields enclosed by brackets "[]" replaced with your own identifying
17b24ab676SJeff Bonwick  * information: Portions Copyright [yyyy] [name of copyright owner]
18b24ab676SJeff Bonwick  *
19b24ab676SJeff Bonwick  * CDDL HEADER END
20b24ab676SJeff Bonwick  */
21b24ab676SJeff Bonwick 
22b24ab676SJeff Bonwick /*
23b24ab676SJeff Bonwick  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
24b24ab676SJeff Bonwick  * Use is subject to license terms.
25b24ab676SJeff Bonwick  */
26b24ab676SJeff Bonwick 
27b24ab676SJeff Bonwick #include <sys/zfs_context.h>
28b24ab676SJeff Bonwick #include <sys/spa.h>
29b24ab676SJeff Bonwick #include <sys/spa_impl.h>
30b24ab676SJeff Bonwick #include <sys/zio.h>
31b24ab676SJeff Bonwick #include <sys/ddt.h>
32b24ab676SJeff Bonwick #include <sys/zap.h>
33b24ab676SJeff Bonwick #include <sys/dmu_tx.h>
34b24ab676SJeff Bonwick #include <sys/arc.h>
35bbfd46c4SJeff Bonwick #include <sys/dsl_pool.h>
36b24ab676SJeff Bonwick #include <sys/zio_checksum.h>
37b24ab676SJeff Bonwick #include <sys/zio_compress.h>
38b24ab676SJeff Bonwick 
39b24ab676SJeff Bonwick static const ddt_ops_t *ddt_ops[DDT_TYPES] = {
40b24ab676SJeff Bonwick 	&ddt_zap_ops,
41b24ab676SJeff Bonwick };
42b24ab676SJeff Bonwick 
43b24ab676SJeff Bonwick static const char *ddt_class_name[DDT_CLASSES] = {
44b24ab676SJeff Bonwick 	"ditto",
45b24ab676SJeff Bonwick 	"duplicate",
46b24ab676SJeff Bonwick 	"unique",
47b24ab676SJeff Bonwick };
48b24ab676SJeff Bonwick 
49b24ab676SJeff Bonwick static void
50b24ab676SJeff Bonwick ddt_object_create(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
51b24ab676SJeff Bonwick     dmu_tx_t *tx)
52b24ab676SJeff Bonwick {
53b24ab676SJeff Bonwick 	spa_t *spa = ddt->ddt_spa;
54b24ab676SJeff Bonwick 	objset_t *os = ddt->ddt_os;
55b24ab676SJeff Bonwick 	uint64_t *objectp = &ddt->ddt_object[type][class];
56b24ab676SJeff Bonwick 	boolean_t prehash = zio_checksum_table[ddt->ddt_checksum].ci_dedup;
57b24ab676SJeff Bonwick 	char name[DDT_NAMELEN];
58b24ab676SJeff Bonwick 
59b24ab676SJeff Bonwick 	ddt_object_name(ddt, type, class, name);
60b24ab676SJeff Bonwick 
61b24ab676SJeff Bonwick 	ASSERT(*objectp == 0);
62b24ab676SJeff Bonwick 	VERIFY(ddt_ops[type]->ddt_op_create(os, objectp, tx, prehash) == 0);
63b24ab676SJeff Bonwick 	ASSERT(*objectp != 0);
64b24ab676SJeff Bonwick 
65b24ab676SJeff Bonwick 	VERIFY(zap_add(os, DMU_POOL_DIRECTORY_OBJECT, name,
66b24ab676SJeff Bonwick 	    sizeof (uint64_t), 1, objectp, tx) == 0);
67b24ab676SJeff Bonwick 
68b24ab676SJeff Bonwick 	VERIFY(zap_add(os, spa->spa_ddt_stat_object, name,
69b24ab676SJeff Bonwick 	    sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t),
70b24ab676SJeff Bonwick 	    &ddt->ddt_histogram[type][class], tx) == 0);
71b24ab676SJeff Bonwick }
72b24ab676SJeff Bonwick 
73b24ab676SJeff Bonwick static void
74b24ab676SJeff Bonwick ddt_object_destroy(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
75b24ab676SJeff Bonwick     dmu_tx_t *tx)
76b24ab676SJeff Bonwick {
77b24ab676SJeff Bonwick 	spa_t *spa = ddt->ddt_spa;
78b24ab676SJeff Bonwick 	objset_t *os = ddt->ddt_os;
79b24ab676SJeff Bonwick 	uint64_t *objectp = &ddt->ddt_object[type][class];
80b24ab676SJeff Bonwick 	char name[DDT_NAMELEN];
81b24ab676SJeff Bonwick 
82b24ab676SJeff Bonwick 	ddt_object_name(ddt, type, class, name);
83b24ab676SJeff Bonwick 
84b24ab676SJeff Bonwick 	ASSERT(*objectp != 0);
85b24ab676SJeff Bonwick 	ASSERT(ddt_object_count(ddt, type, class) == 0);
86b24ab676SJeff Bonwick 	ASSERT(ddt_histogram_empty(&ddt->ddt_histogram[type][class]));
87b24ab676SJeff Bonwick 	VERIFY(zap_remove(os, DMU_POOL_DIRECTORY_OBJECT, name, tx) == 0);
88b24ab676SJeff Bonwick 	VERIFY(zap_remove(os, spa->spa_ddt_stat_object, name, tx) == 0);
89b24ab676SJeff Bonwick 	VERIFY(ddt_ops[type]->ddt_op_destroy(os, *objectp, tx) == 0);
90b24ab676SJeff Bonwick 
91b24ab676SJeff Bonwick 	*objectp = 0;
92b24ab676SJeff Bonwick }
93b24ab676SJeff Bonwick 
94b24ab676SJeff Bonwick static int
95b24ab676SJeff Bonwick ddt_object_load(ddt_t *ddt, enum ddt_type type, enum ddt_class class)
96b24ab676SJeff Bonwick {
97b24ab676SJeff Bonwick 	char name[DDT_NAMELEN];
98b24ab676SJeff Bonwick 	int error;
99b24ab676SJeff Bonwick 
100b24ab676SJeff Bonwick 	ddt_object_name(ddt, type, class, name);
101b24ab676SJeff Bonwick 
102b24ab676SJeff Bonwick 	error = zap_lookup(ddt->ddt_os, DMU_POOL_DIRECTORY_OBJECT, name,
103b24ab676SJeff Bonwick 	    sizeof (uint64_t), 1, &ddt->ddt_object[type][class]);
104b24ab676SJeff Bonwick 
105b24ab676SJeff Bonwick 	if (error)
106b24ab676SJeff Bonwick 		return (error);
107b24ab676SJeff Bonwick 
108b24ab676SJeff Bonwick 	error = zap_lookup(ddt->ddt_os, ddt->ddt_spa->spa_ddt_stat_object, name,
109b24ab676SJeff Bonwick 	    sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t),
110b24ab676SJeff Bonwick 	    &ddt->ddt_histogram[type][class]);
111b24ab676SJeff Bonwick 
112b24ab676SJeff Bonwick 	ASSERT(error == 0);
113b24ab676SJeff Bonwick 	return (error);
114b24ab676SJeff Bonwick }
115b24ab676SJeff Bonwick 
116b24ab676SJeff Bonwick static void
117b24ab676SJeff Bonwick ddt_object_sync(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
118b24ab676SJeff Bonwick     dmu_tx_t *tx)
119b24ab676SJeff Bonwick {
120b24ab676SJeff Bonwick 	char name[DDT_NAMELEN];
121b24ab676SJeff Bonwick 
122b24ab676SJeff Bonwick 	ddt_object_name(ddt, type, class, name);
123b24ab676SJeff Bonwick 
124b24ab676SJeff Bonwick 	VERIFY(zap_update(ddt->ddt_os, ddt->ddt_spa->spa_ddt_stat_object, name,
125b24ab676SJeff Bonwick 	    sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t),
126b24ab676SJeff Bonwick 	    &ddt->ddt_histogram[type][class], tx) == 0);
127b24ab676SJeff Bonwick }
128b24ab676SJeff Bonwick 
129b24ab676SJeff Bonwick static int
130b24ab676SJeff Bonwick ddt_object_lookup(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
131b24ab676SJeff Bonwick     ddt_entry_t *dde)
132b24ab676SJeff Bonwick {
133b24ab676SJeff Bonwick 	if (!ddt_object_exists(ddt, type, class))
134b24ab676SJeff Bonwick 		return (ENOENT);
135b24ab676SJeff Bonwick 
136b24ab676SJeff Bonwick 	return (ddt_ops[type]->ddt_op_lookup(ddt->ddt_os,
137b24ab676SJeff Bonwick 	    ddt->ddt_object[type][class], dde));
138b24ab676SJeff Bonwick }
139b24ab676SJeff Bonwick 
140b24ab676SJeff Bonwick static int
141b24ab676SJeff Bonwick ddt_object_update(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
142b24ab676SJeff Bonwick     ddt_entry_t *dde, dmu_tx_t *tx)
143b24ab676SJeff Bonwick {
144b24ab676SJeff Bonwick 	ASSERT(ddt_object_exists(ddt, type, class));
145b24ab676SJeff Bonwick 
146b24ab676SJeff Bonwick 	return (ddt_ops[type]->ddt_op_update(ddt->ddt_os,
147b24ab676SJeff Bonwick 	    ddt->ddt_object[type][class], dde, tx));
148b24ab676SJeff Bonwick }
149b24ab676SJeff Bonwick 
150b24ab676SJeff Bonwick static int
151b24ab676SJeff Bonwick ddt_object_remove(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
152b24ab676SJeff Bonwick     ddt_entry_t *dde, dmu_tx_t *tx)
153b24ab676SJeff Bonwick {
154b24ab676SJeff Bonwick 	ASSERT(ddt_object_exists(ddt, type, class));
155b24ab676SJeff Bonwick 
156b24ab676SJeff Bonwick 	return (ddt_ops[type]->ddt_op_remove(ddt->ddt_os,
157b24ab676SJeff Bonwick 	    ddt->ddt_object[type][class], dde, tx));
158b24ab676SJeff Bonwick }
159b24ab676SJeff Bonwick 
160b24ab676SJeff Bonwick int
161b24ab676SJeff Bonwick ddt_object_walk(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
162bbfd46c4SJeff Bonwick     uint64_t *walk, ddt_entry_t *dde)
163b24ab676SJeff Bonwick {
164b24ab676SJeff Bonwick 	ASSERT(ddt_object_exists(ddt, type, class));
165b24ab676SJeff Bonwick 
166b24ab676SJeff Bonwick 	return (ddt_ops[type]->ddt_op_walk(ddt->ddt_os,
167b24ab676SJeff Bonwick 	    ddt->ddt_object[type][class], dde, walk));
168b24ab676SJeff Bonwick }
169b24ab676SJeff Bonwick 
170b24ab676SJeff Bonwick uint64_t
171b24ab676SJeff Bonwick ddt_object_count(ddt_t *ddt, enum ddt_type type, enum ddt_class class)
172b24ab676SJeff Bonwick {
173b24ab676SJeff Bonwick 	ASSERT(ddt_object_exists(ddt, type, class));
174b24ab676SJeff Bonwick 
175b24ab676SJeff Bonwick 	return (ddt_ops[type]->ddt_op_count(ddt->ddt_os,
176b24ab676SJeff Bonwick 	    ddt->ddt_object[type][class]));
177b24ab676SJeff Bonwick }
178b24ab676SJeff Bonwick 
179b24ab676SJeff Bonwick int
180b24ab676SJeff Bonwick ddt_object_info(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
181b24ab676SJeff Bonwick     dmu_object_info_t *doi)
182b24ab676SJeff Bonwick {
183b24ab676SJeff Bonwick 	if (!ddt_object_exists(ddt, type, class))
184b24ab676SJeff Bonwick 		return (ENOENT);
185b24ab676SJeff Bonwick 
186b24ab676SJeff Bonwick 	return (dmu_object_info(ddt->ddt_os, ddt->ddt_object[type][class],
187b24ab676SJeff Bonwick 	    doi));
188b24ab676SJeff Bonwick }
189b24ab676SJeff Bonwick 
190b24ab676SJeff Bonwick boolean_t
191b24ab676SJeff Bonwick ddt_object_exists(ddt_t *ddt, enum ddt_type type, enum ddt_class class)
192b24ab676SJeff Bonwick {
193b24ab676SJeff Bonwick 	return (!!ddt->ddt_object[type][class]);
194b24ab676SJeff Bonwick }
195b24ab676SJeff Bonwick 
196b24ab676SJeff Bonwick void
197b24ab676SJeff Bonwick ddt_object_name(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
198b24ab676SJeff Bonwick     char *name)
199b24ab676SJeff Bonwick {
200b24ab676SJeff Bonwick 	(void) sprintf(name, DMU_POOL_DDT,
201b24ab676SJeff Bonwick 	    zio_checksum_table[ddt->ddt_checksum].ci_name,
202b24ab676SJeff Bonwick 	    ddt_ops[type]->ddt_op_name, ddt_class_name[class]);
203b24ab676SJeff Bonwick }
204b24ab676SJeff Bonwick 
205b24ab676SJeff Bonwick void
206b24ab676SJeff Bonwick ddt_bp_fill(const ddt_phys_t *ddp, blkptr_t *bp, uint64_t txg)
207b24ab676SJeff Bonwick {
208b24ab676SJeff Bonwick 	ASSERT(txg != 0);
209b24ab676SJeff Bonwick 
210b24ab676SJeff Bonwick 	for (int d = 0; d < SPA_DVAS_PER_BP; d++)
211b24ab676SJeff Bonwick 		bp->blk_dva[d] = ddp->ddp_dva[d];
212b24ab676SJeff Bonwick 	BP_SET_BIRTH(bp, txg, ddp->ddp_phys_birth);
213b24ab676SJeff Bonwick }
214b24ab676SJeff Bonwick 
215b24ab676SJeff Bonwick void
216bbfd46c4SJeff Bonwick ddt_bp_create(enum zio_checksum checksum,
217bbfd46c4SJeff Bonwick     const ddt_key_t *ddk, const ddt_phys_t *ddp, blkptr_t *bp)
218b24ab676SJeff Bonwick {
219b24ab676SJeff Bonwick 	BP_ZERO(bp);
220b24ab676SJeff Bonwick 
221b24ab676SJeff Bonwick 	if (ddp != NULL)
222b24ab676SJeff Bonwick 		ddt_bp_fill(ddp, bp, ddp->ddp_phys_birth);
223b24ab676SJeff Bonwick 
224b24ab676SJeff Bonwick 	bp->blk_cksum = ddk->ddk_cksum;
225b24ab676SJeff Bonwick 
226b24ab676SJeff Bonwick 	BP_SET_LSIZE(bp, DDK_GET_LSIZE(ddk));
227b24ab676SJeff Bonwick 	BP_SET_PSIZE(bp, DDK_GET_PSIZE(ddk));
228b24ab676SJeff Bonwick 	BP_SET_COMPRESS(bp, DDK_GET_COMPRESS(ddk));
229bbfd46c4SJeff Bonwick 	BP_SET_CHECKSUM(bp, checksum);
230b24ab676SJeff Bonwick 	BP_SET_TYPE(bp, DMU_OT_NONE);
231b24ab676SJeff Bonwick 	BP_SET_LEVEL(bp, 0);
232b24ab676SJeff Bonwick 	BP_SET_DEDUP(bp, 0);
233b24ab676SJeff Bonwick 	BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER);
234b24ab676SJeff Bonwick }
235b24ab676SJeff Bonwick 
236b24ab676SJeff Bonwick void
237b24ab676SJeff Bonwick ddt_key_fill(ddt_key_t *ddk, const blkptr_t *bp)
238b24ab676SJeff Bonwick {
239b24ab676SJeff Bonwick 	ddk->ddk_cksum = bp->blk_cksum;
240b24ab676SJeff Bonwick 	ddk->ddk_prop = 0;
241b24ab676SJeff Bonwick 
242b24ab676SJeff Bonwick 	DDK_SET_LSIZE(ddk, BP_GET_LSIZE(bp));
243b24ab676SJeff Bonwick 	DDK_SET_PSIZE(ddk, BP_GET_PSIZE(bp));
244b24ab676SJeff Bonwick 	DDK_SET_COMPRESS(ddk, BP_GET_COMPRESS(bp));
245b24ab676SJeff Bonwick }
246b24ab676SJeff Bonwick 
247b24ab676SJeff Bonwick void
248b24ab676SJeff Bonwick ddt_phys_fill(ddt_phys_t *ddp, const blkptr_t *bp)
249b24ab676SJeff Bonwick {
250b24ab676SJeff Bonwick 	ASSERT(ddp->ddp_phys_birth == 0);
251b24ab676SJeff Bonwick 
252b24ab676SJeff Bonwick 	for (int d = 0; d < SPA_DVAS_PER_BP; d++)
253b24ab676SJeff Bonwick 		ddp->ddp_dva[d] = bp->blk_dva[d];
254b24ab676SJeff Bonwick 	ddp->ddp_phys_birth = BP_PHYSICAL_BIRTH(bp);
255b24ab676SJeff Bonwick }
256b24ab676SJeff Bonwick 
257b24ab676SJeff Bonwick void
258b24ab676SJeff Bonwick ddt_phys_clear(ddt_phys_t *ddp)
259b24ab676SJeff Bonwick {
260b24ab676SJeff Bonwick 	bzero(ddp, sizeof (*ddp));
261b24ab676SJeff Bonwick }
262b24ab676SJeff Bonwick 
263b24ab676SJeff Bonwick void
264b24ab676SJeff Bonwick ddt_phys_addref(ddt_phys_t *ddp)
265b24ab676SJeff Bonwick {
266b24ab676SJeff Bonwick 	ddp->ddp_refcnt++;
267b24ab676SJeff Bonwick }
268b24ab676SJeff Bonwick 
269b24ab676SJeff Bonwick void
270b24ab676SJeff Bonwick ddt_phys_decref(ddt_phys_t *ddp)
271b24ab676SJeff Bonwick {
272b24ab676SJeff Bonwick 	ASSERT((int64_t)ddp->ddp_refcnt > 0);
273b24ab676SJeff Bonwick 	ddp->ddp_refcnt--;
274b24ab676SJeff Bonwick }
275b24ab676SJeff Bonwick 
276b24ab676SJeff Bonwick void
277b24ab676SJeff Bonwick ddt_phys_free(ddt_t *ddt, ddt_key_t *ddk, ddt_phys_t *ddp, uint64_t txg)
278b24ab676SJeff Bonwick {
279b24ab676SJeff Bonwick 	blkptr_t blk;
280b24ab676SJeff Bonwick 
281bbfd46c4SJeff Bonwick 	ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk);
282b24ab676SJeff Bonwick 	ddt_phys_clear(ddp);
283b24ab676SJeff Bonwick 	zio_free(ddt->ddt_spa, txg, &blk);
284b24ab676SJeff Bonwick }
285b24ab676SJeff Bonwick 
286b24ab676SJeff Bonwick ddt_phys_t *
287b24ab676SJeff Bonwick ddt_phys_select(const ddt_entry_t *dde, const blkptr_t *bp)
288b24ab676SJeff Bonwick {
289b24ab676SJeff Bonwick 	ddt_phys_t *ddp = (ddt_phys_t *)dde->dde_phys;
290b24ab676SJeff Bonwick 
291b24ab676SJeff Bonwick 	for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
292b24ab676SJeff Bonwick 		if (DVA_EQUAL(BP_IDENTITY(bp), &ddp->ddp_dva[0]) &&
293b24ab676SJeff Bonwick 		    BP_PHYSICAL_BIRTH(bp) == ddp->ddp_phys_birth)
294b24ab676SJeff Bonwick 			return (ddp);
295b24ab676SJeff Bonwick 	}
296b24ab676SJeff Bonwick 	return (NULL);
297b24ab676SJeff Bonwick }
298b24ab676SJeff Bonwick 
299b24ab676SJeff Bonwick uint64_t
300b24ab676SJeff Bonwick ddt_phys_total_refcnt(const ddt_entry_t *dde)
301b24ab676SJeff Bonwick {
302b24ab676SJeff Bonwick 	uint64_t refcnt = 0;
303b24ab676SJeff Bonwick 
304b24ab676SJeff Bonwick 	for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++)
305b24ab676SJeff Bonwick 		refcnt += dde->dde_phys[p].ddp_refcnt;
306b24ab676SJeff Bonwick 
307b24ab676SJeff Bonwick 	return (refcnt);
308b24ab676SJeff Bonwick }
309b24ab676SJeff Bonwick 
310b24ab676SJeff Bonwick static void
311b24ab676SJeff Bonwick ddt_stat_generate(ddt_t *ddt, ddt_entry_t *dde, ddt_stat_t *dds)
312b24ab676SJeff Bonwick {
313b24ab676SJeff Bonwick 	spa_t *spa = ddt->ddt_spa;
314b24ab676SJeff Bonwick 	ddt_phys_t *ddp = dde->dde_phys;
315b24ab676SJeff Bonwick 	ddt_key_t *ddk = &dde->dde_key;
316b24ab676SJeff Bonwick 	uint64_t lsize = DDK_GET_LSIZE(ddk);
317b24ab676SJeff Bonwick 	uint64_t psize = DDK_GET_PSIZE(ddk);
318b24ab676SJeff Bonwick 
319b24ab676SJeff Bonwick 	bzero(dds, sizeof (*dds));
320b24ab676SJeff Bonwick 
321b24ab676SJeff Bonwick 	for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
322b24ab676SJeff Bonwick 		uint64_t dsize = 0;
323b24ab676SJeff Bonwick 		uint64_t refcnt = ddp->ddp_refcnt;
324b24ab676SJeff Bonwick 
325b24ab676SJeff Bonwick 		if (ddp->ddp_phys_birth == 0)
326b24ab676SJeff Bonwick 			continue;
327b24ab676SJeff Bonwick 
328b24ab676SJeff Bonwick 		for (int d = 0; d < SPA_DVAS_PER_BP; d++)
329b24ab676SJeff Bonwick 			dsize += dva_get_dsize_sync(spa, &ddp->ddp_dva[d]);
330b24ab676SJeff Bonwick 
331b24ab676SJeff Bonwick 		dds->dds_blocks += 1;
332b24ab676SJeff Bonwick 		dds->dds_lsize += lsize;
333b24ab676SJeff Bonwick 		dds->dds_psize += psize;
334b24ab676SJeff Bonwick 		dds->dds_dsize += dsize;
335b24ab676SJeff Bonwick 
336b24ab676SJeff Bonwick 		dds->dds_ref_blocks += refcnt;
337b24ab676SJeff Bonwick 		dds->dds_ref_lsize += lsize * refcnt;
338b24ab676SJeff Bonwick 		dds->dds_ref_psize += psize * refcnt;
339b24ab676SJeff Bonwick 		dds->dds_ref_dsize += dsize * refcnt;
340b24ab676SJeff Bonwick 	}
341b24ab676SJeff Bonwick }
342b24ab676SJeff Bonwick 
343b24ab676SJeff Bonwick void
344b24ab676SJeff Bonwick ddt_stat_add(ddt_stat_t *dst, const ddt_stat_t *src, uint64_t neg)
345b24ab676SJeff Bonwick {
346b24ab676SJeff Bonwick 	const uint64_t *s = (const uint64_t *)src;
347b24ab676SJeff Bonwick 	uint64_t *d = (uint64_t *)dst;
348b24ab676SJeff Bonwick 	uint64_t *d_end = (uint64_t *)(dst + 1);
349b24ab676SJeff Bonwick 
350b24ab676SJeff Bonwick 	ASSERT(neg == 0 || neg == -1ULL);	/* add or subtract */
351b24ab676SJeff Bonwick 
352b24ab676SJeff Bonwick 	while (d < d_end)
353b24ab676SJeff Bonwick 		*d++ += (*s++ ^ neg) - neg;
354b24ab676SJeff Bonwick }
355b24ab676SJeff Bonwick 
356b24ab676SJeff Bonwick static void
357b24ab676SJeff Bonwick ddt_stat_update(ddt_t *ddt, ddt_entry_t *dde, uint64_t neg)
358b24ab676SJeff Bonwick {
359b24ab676SJeff Bonwick 	ddt_stat_t dds;
360b24ab676SJeff Bonwick 	ddt_histogram_t *ddh;
361b24ab676SJeff Bonwick 	int bucket;
362b24ab676SJeff Bonwick 
363b24ab676SJeff Bonwick 	ddt_stat_generate(ddt, dde, &dds);
364b24ab676SJeff Bonwick 
365b24ab676SJeff Bonwick 	bucket = highbit(dds.dds_ref_blocks) - 1;
366b24ab676SJeff Bonwick 	ASSERT(bucket >= 0);
367b24ab676SJeff Bonwick 
368b24ab676SJeff Bonwick 	ddh = &ddt->ddt_histogram[dde->dde_type][dde->dde_class];
369b24ab676SJeff Bonwick 
370b24ab676SJeff Bonwick 	ddt_stat_add(&ddh->ddh_stat[bucket], &dds, neg);
371b24ab676SJeff Bonwick }
372b24ab676SJeff Bonwick 
373b24ab676SJeff Bonwick void
374b24ab676SJeff Bonwick ddt_histogram_add(ddt_histogram_t *dst, const ddt_histogram_t *src)
375b24ab676SJeff Bonwick {
376b24ab676SJeff Bonwick 	for (int h = 0; h < 64; h++)
377b24ab676SJeff Bonwick 		ddt_stat_add(&dst->ddh_stat[h], &src->ddh_stat[h], 0);
378b24ab676SJeff Bonwick }
379b24ab676SJeff Bonwick 
380b24ab676SJeff Bonwick void
381b24ab676SJeff Bonwick ddt_histogram_stat(ddt_stat_t *dds, const ddt_histogram_t *ddh)
382b24ab676SJeff Bonwick {
383b24ab676SJeff Bonwick 	bzero(dds, sizeof (*dds));
384b24ab676SJeff Bonwick 
385b24ab676SJeff Bonwick 	for (int h = 0; h < 64; h++)
386b24ab676SJeff Bonwick 		ddt_stat_add(dds, &ddh->ddh_stat[h], 0);
387b24ab676SJeff Bonwick }
388b24ab676SJeff Bonwick 
389b24ab676SJeff Bonwick boolean_t
390b24ab676SJeff Bonwick ddt_histogram_empty(const ddt_histogram_t *ddh)
391b24ab676SJeff Bonwick {
392b24ab676SJeff Bonwick 	const uint64_t *s = (const uint64_t *)ddh;
393b24ab676SJeff Bonwick 	const uint64_t *s_end = (const uint64_t *)(ddh + 1);
394b24ab676SJeff Bonwick 
395b24ab676SJeff Bonwick 	while (s < s_end)
396b24ab676SJeff Bonwick 		if (*s++ != 0)
397b24ab676SJeff Bonwick 			return (B_FALSE);
398b24ab676SJeff Bonwick 
399b24ab676SJeff Bonwick 	return (B_TRUE);
400b24ab676SJeff Bonwick }
401b24ab676SJeff Bonwick 
402*9eb19f4dSGeorge Wilson void
403*9eb19f4dSGeorge Wilson ddt_get_dedup_object_stats(spa_t *spa, ddt_object_t *ddo)
404b24ab676SJeff Bonwick {
405*9eb19f4dSGeorge Wilson 	dmu_object_info_t doi;
406*9eb19f4dSGeorge Wilson 	uint64_t count;
407*9eb19f4dSGeorge Wilson 	int error;
408b24ab676SJeff Bonwick 
409b24ab676SJeff Bonwick 	for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
410b24ab676SJeff Bonwick 		ddt_t *ddt = spa->spa_ddt[c];
411b24ab676SJeff Bonwick 		for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
412b24ab676SJeff Bonwick 			for (enum ddt_class class = 0; class < DDT_CLASSES;
413b24ab676SJeff Bonwick 			    class++) {
414*9eb19f4dSGeorge Wilson 				error = ddt_object_info(ddt, type, class, &doi);
415*9eb19f4dSGeorge Wilson 				if (error == ENOENT)
416*9eb19f4dSGeorge Wilson 					continue;
417*9eb19f4dSGeorge Wilson 				ASSERT3U(error, ==, 0);
418*9eb19f4dSGeorge Wilson 
419*9eb19f4dSGeorge Wilson 				count = ddt_object_count(ddt, type, class);
420*9eb19f4dSGeorge Wilson 				ddo->ddo_count += count;
421*9eb19f4dSGeorge Wilson 				ddo->ddo_dspace +=
422*9eb19f4dSGeorge Wilson 				    (doi.doi_physical_blocks_512 << 9) / count;
423*9eb19f4dSGeorge Wilson 				ddo->ddo_mspace += doi.doi_fill_count *
424*9eb19f4dSGeorge Wilson 				    doi.doi_data_block_size / count;
425*9eb19f4dSGeorge Wilson 			}
426*9eb19f4dSGeorge Wilson 		}
427*9eb19f4dSGeorge Wilson 	}
428*9eb19f4dSGeorge Wilson }
429*9eb19f4dSGeorge Wilson 
430*9eb19f4dSGeorge Wilson void
431*9eb19f4dSGeorge Wilson ddt_get_dedup_histogram(spa_t *spa, ddt_histogram_t *ddh)
432*9eb19f4dSGeorge Wilson {
433*9eb19f4dSGeorge Wilson 	for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
434*9eb19f4dSGeorge Wilson 		ddt_t *ddt = spa->spa_ddt[c];
435*9eb19f4dSGeorge Wilson 		for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
436*9eb19f4dSGeorge Wilson 			for (enum ddt_class class = 0; class < DDT_CLASSES;
437*9eb19f4dSGeorge Wilson 			    class++) {
438*9eb19f4dSGeorge Wilson 				ddt_histogram_add(ddh,
439b24ab676SJeff Bonwick 				    &ddt->ddt_histogram[type][class]);
440b24ab676SJeff Bonwick 			}
441b24ab676SJeff Bonwick 		}
442b24ab676SJeff Bonwick 	}
443*9eb19f4dSGeorge Wilson }
444*9eb19f4dSGeorge Wilson 
445*9eb19f4dSGeorge Wilson void
446*9eb19f4dSGeorge Wilson ddt_get_dedup_stats(spa_t *spa, ddt_stat_t *dds_total)
447*9eb19f4dSGeorge Wilson {
448*9eb19f4dSGeorge Wilson 	ddt_histogram_t *ddh_total;
449b24ab676SJeff Bonwick 
450*9eb19f4dSGeorge Wilson 	ddh_total = kmem_zalloc(sizeof (ddt_histogram_t), KM_SLEEP);
451*9eb19f4dSGeorge Wilson 	ddt_get_dedup_histogram(spa, ddh_total);
452*9eb19f4dSGeorge Wilson 	ddt_histogram_stat(dds_total, ddh_total);
453*9eb19f4dSGeorge Wilson 	kmem_free(ddh_total, sizeof (ddt_histogram_t));
454485bbbf5SGeorge Wilson }
455485bbbf5SGeorge Wilson 
456485bbbf5SGeorge Wilson uint64_t
457485bbbf5SGeorge Wilson ddt_get_dedup_dspace(spa_t *spa)
458485bbbf5SGeorge Wilson {
459485bbbf5SGeorge Wilson 	ddt_stat_t dds_total = { 0 };
460485bbbf5SGeorge Wilson 
461485bbbf5SGeorge Wilson 	ddt_get_dedup_stats(spa, &dds_total);
462485bbbf5SGeorge Wilson 	return (dds_total.dds_ref_dsize - dds_total.dds_dsize);
463485bbbf5SGeorge Wilson }
464485bbbf5SGeorge Wilson 
465485bbbf5SGeorge Wilson uint64_t
466485bbbf5SGeorge Wilson ddt_get_pool_dedup_ratio(spa_t *spa)
467485bbbf5SGeorge Wilson {
468485bbbf5SGeorge Wilson 	ddt_stat_t dds_total = { 0 };
469b24ab676SJeff Bonwick 
470485bbbf5SGeorge Wilson 	ddt_get_dedup_stats(spa, &dds_total);
471b24ab676SJeff Bonwick 	if (dds_total.dds_dsize == 0)
472b24ab676SJeff Bonwick 		return (100);
473b24ab676SJeff Bonwick 
474b24ab676SJeff Bonwick 	return (dds_total.dds_ref_dsize * 100 / dds_total.dds_dsize);
475b24ab676SJeff Bonwick }
476b24ab676SJeff Bonwick 
477b24ab676SJeff Bonwick int
478b24ab676SJeff Bonwick ddt_ditto_copies_needed(ddt_t *ddt, ddt_entry_t *dde, ddt_phys_t *ddp_willref)
479b24ab676SJeff Bonwick {
480b24ab676SJeff Bonwick 	spa_t *spa = ddt->ddt_spa;
481b24ab676SJeff Bonwick 	uint64_t total_refcnt = 0;
482b24ab676SJeff Bonwick 	uint64_t ditto = spa->spa_dedup_ditto;
483b24ab676SJeff Bonwick 	int total_copies = 0;
484b24ab676SJeff Bonwick 	int desired_copies = 0;
485b24ab676SJeff Bonwick 
486b24ab676SJeff Bonwick 	for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) {
487b24ab676SJeff Bonwick 		ddt_phys_t *ddp = &dde->dde_phys[p];
488b24ab676SJeff Bonwick 		zio_t *zio = dde->dde_lead_zio[p];
489b24ab676SJeff Bonwick 		uint64_t refcnt = ddp->ddp_refcnt;	/* committed refs */
490b24ab676SJeff Bonwick 		if (zio != NULL)
491b24ab676SJeff Bonwick 			refcnt += zio->io_parent_count;	/* pending refs */
492b24ab676SJeff Bonwick 		if (ddp == ddp_willref)
493b24ab676SJeff Bonwick 			refcnt++;			/* caller's ref */
494b24ab676SJeff Bonwick 		if (refcnt != 0) {
495b24ab676SJeff Bonwick 			total_refcnt += refcnt;
496b24ab676SJeff Bonwick 			total_copies += p;
497b24ab676SJeff Bonwick 		}
498b24ab676SJeff Bonwick 	}
499b24ab676SJeff Bonwick 
500b24ab676SJeff Bonwick 	if (ditto == 0 || ditto > UINT32_MAX)
501b24ab676SJeff Bonwick 		ditto = UINT32_MAX;
502b24ab676SJeff Bonwick 
503b24ab676SJeff Bonwick 	if (total_refcnt >= 1)
504b24ab676SJeff Bonwick 		desired_copies++;
505b24ab676SJeff Bonwick 	if (total_refcnt >= ditto)
506b24ab676SJeff Bonwick 		desired_copies++;
507b24ab676SJeff Bonwick 	if (total_refcnt >= ditto * ditto)
508b24ab676SJeff Bonwick 		desired_copies++;
509b24ab676SJeff Bonwick 
510b24ab676SJeff Bonwick 	return (MAX(desired_copies, total_copies) - total_copies);
511b24ab676SJeff Bonwick }
512b24ab676SJeff Bonwick 
513b24ab676SJeff Bonwick int
514b24ab676SJeff Bonwick ddt_ditto_copies_present(ddt_entry_t *dde)
515b24ab676SJeff Bonwick {
516b24ab676SJeff Bonwick 	ddt_phys_t *ddp = &dde->dde_phys[DDT_PHYS_DITTO];
517b24ab676SJeff Bonwick 	dva_t *dva = ddp->ddp_dva;
518b24ab676SJeff Bonwick 	int copies = 0 - DVA_GET_GANG(dva);
519b24ab676SJeff Bonwick 
520b24ab676SJeff Bonwick 	for (int d = 0; d < SPA_DVAS_PER_BP; d++, dva++)
521b24ab676SJeff Bonwick 		if (DVA_IS_VALID(dva))
522b24ab676SJeff Bonwick 			copies++;
523b24ab676SJeff Bonwick 
524b24ab676SJeff Bonwick 	ASSERT(copies >= 0 && copies < SPA_DVAS_PER_BP);
525b24ab676SJeff Bonwick 
526b24ab676SJeff Bonwick 	return (copies);
527b24ab676SJeff Bonwick }
528b24ab676SJeff Bonwick 
529b24ab676SJeff Bonwick size_t
530b24ab676SJeff Bonwick ddt_compress(void *src, uchar_t *dst, size_t s_len, size_t d_len)
531b24ab676SJeff Bonwick {
532b24ab676SJeff Bonwick 	uchar_t *version = dst++;
533b24ab676SJeff Bonwick 	int cpfunc = ZIO_COMPRESS_ZLE;
534b24ab676SJeff Bonwick 	zio_compress_info_t *ci = &zio_compress_table[cpfunc];
535b24ab676SJeff Bonwick 	size_t c_len;
536b24ab676SJeff Bonwick 
537b24ab676SJeff Bonwick 	ASSERT(d_len >= s_len + 1);	/* no compression plus version byte */
538b24ab676SJeff Bonwick 
539b24ab676SJeff Bonwick 	c_len = ci->ci_compress(src, dst, s_len, d_len - 1, ci->ci_level);
540b24ab676SJeff Bonwick 
541b24ab676SJeff Bonwick 	if (c_len == s_len) {
542b24ab676SJeff Bonwick 		cpfunc = ZIO_COMPRESS_OFF;
543b24ab676SJeff Bonwick 		bcopy(src, dst, s_len);
544b24ab676SJeff Bonwick 	}
545b24ab676SJeff Bonwick 
546b24ab676SJeff Bonwick 	*version = (ZFS_HOST_BYTEORDER & DDT_COMPRESS_BYTEORDER_MASK) | cpfunc;
547b24ab676SJeff Bonwick 
548b24ab676SJeff Bonwick 	return (c_len + 1);
549b24ab676SJeff Bonwick }
550b24ab676SJeff Bonwick 
551b24ab676SJeff Bonwick void
552b24ab676SJeff Bonwick ddt_decompress(uchar_t *src, void *dst, size_t s_len, size_t d_len)
553b24ab676SJeff Bonwick {
554b24ab676SJeff Bonwick 	uchar_t version = *src++;
555b24ab676SJeff Bonwick 	int cpfunc = version & DDT_COMPRESS_FUNCTION_MASK;
556b24ab676SJeff Bonwick 	zio_compress_info_t *ci = &zio_compress_table[cpfunc];
557b24ab676SJeff Bonwick 
558b24ab676SJeff Bonwick 	if (ci->ci_decompress != NULL)
559b24ab676SJeff Bonwick 		(void) ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level);
560b24ab676SJeff Bonwick 	else
561b24ab676SJeff Bonwick 		bcopy(src, dst, d_len);
562b24ab676SJeff Bonwick 
563b24ab676SJeff Bonwick 	if ((version ^ ZFS_HOST_BYTEORDER) & DDT_COMPRESS_BYTEORDER_MASK)
564b24ab676SJeff Bonwick 		byteswap_uint64_array(dst, d_len);
565b24ab676SJeff Bonwick }
566b24ab676SJeff Bonwick 
567b24ab676SJeff Bonwick ddt_t *
568b24ab676SJeff Bonwick ddt_select_by_checksum(spa_t *spa, enum zio_checksum c)
569b24ab676SJeff Bonwick {
570b24ab676SJeff Bonwick 	return (spa->spa_ddt[c]);
571b24ab676SJeff Bonwick }
572b24ab676SJeff Bonwick 
573b24ab676SJeff Bonwick ddt_t *
574b24ab676SJeff Bonwick ddt_select(spa_t *spa, const blkptr_t *bp)
575b24ab676SJeff Bonwick {
576b24ab676SJeff Bonwick 	return (spa->spa_ddt[BP_GET_CHECKSUM(bp)]);
577b24ab676SJeff Bonwick }
578b24ab676SJeff Bonwick 
579b24ab676SJeff Bonwick void
580b24ab676SJeff Bonwick ddt_enter(ddt_t *ddt)
581b24ab676SJeff Bonwick {
582b24ab676SJeff Bonwick 	mutex_enter(&ddt->ddt_lock);
583b24ab676SJeff Bonwick }
584b24ab676SJeff Bonwick 
585b24ab676SJeff Bonwick void
586b24ab676SJeff Bonwick ddt_exit(ddt_t *ddt)
587b24ab676SJeff Bonwick {
588b24ab676SJeff Bonwick 	mutex_exit(&ddt->ddt_lock);
589b24ab676SJeff Bonwick }
590b24ab676SJeff Bonwick 
591b24ab676SJeff Bonwick static ddt_entry_t *
592b24ab676SJeff Bonwick ddt_alloc(const ddt_key_t *ddk)
593b24ab676SJeff Bonwick {
594b24ab676SJeff Bonwick 	ddt_entry_t *dde;
595b24ab676SJeff Bonwick 
596b24ab676SJeff Bonwick 	dde = kmem_zalloc(sizeof (ddt_entry_t), KM_SLEEP);
597b24ab676SJeff Bonwick 	cv_init(&dde->dde_cv, NULL, CV_DEFAULT, NULL);
598b24ab676SJeff Bonwick 
599b24ab676SJeff Bonwick 	dde->dde_key = *ddk;
600b24ab676SJeff Bonwick 
601b24ab676SJeff Bonwick 	return (dde);
602b24ab676SJeff Bonwick }
603b24ab676SJeff Bonwick 
604b24ab676SJeff Bonwick static void
605b24ab676SJeff Bonwick ddt_free(ddt_entry_t *dde)
606b24ab676SJeff Bonwick {
607b24ab676SJeff Bonwick 	ASSERT(!dde->dde_loading);
608b24ab676SJeff Bonwick 
609b24ab676SJeff Bonwick 	for (int p = 0; p < DDT_PHYS_TYPES; p++)
610b24ab676SJeff Bonwick 		ASSERT(dde->dde_lead_zio[p] == NULL);
611b24ab676SJeff Bonwick 
612b24ab676SJeff Bonwick 	if (dde->dde_repair_data != NULL)
613b24ab676SJeff Bonwick 		zio_buf_free(dde->dde_repair_data,
614b24ab676SJeff Bonwick 		    DDK_GET_PSIZE(&dde->dde_key));
615b24ab676SJeff Bonwick 
616b24ab676SJeff Bonwick 	cv_destroy(&dde->dde_cv);
617b24ab676SJeff Bonwick 	kmem_free(dde, sizeof (*dde));
618b24ab676SJeff Bonwick }
619b24ab676SJeff Bonwick 
620b24ab676SJeff Bonwick void
621b24ab676SJeff Bonwick ddt_remove(ddt_t *ddt, ddt_entry_t *dde)
622b24ab676SJeff Bonwick {
623b24ab676SJeff Bonwick 	ASSERT(MUTEX_HELD(&ddt->ddt_lock));
624b24ab676SJeff Bonwick 
625b24ab676SJeff Bonwick 	avl_remove(&ddt->ddt_tree, dde);
626b24ab676SJeff Bonwick 	ddt_free(dde);
627b24ab676SJeff Bonwick }
628b24ab676SJeff Bonwick 
629b24ab676SJeff Bonwick ddt_entry_t *
630b24ab676SJeff Bonwick ddt_lookup(ddt_t *ddt, const blkptr_t *bp, boolean_t add)
631b24ab676SJeff Bonwick {
632b24ab676SJeff Bonwick 	ddt_entry_t *dde, dde_search;
633b24ab676SJeff Bonwick 	enum ddt_type type;
634b24ab676SJeff Bonwick 	enum ddt_class class;
635b24ab676SJeff Bonwick 	avl_index_t where;
636b24ab676SJeff Bonwick 	int error;
637b24ab676SJeff Bonwick 
638b24ab676SJeff Bonwick 	ASSERT(MUTEX_HELD(&ddt->ddt_lock));
639b24ab676SJeff Bonwick 
640b24ab676SJeff Bonwick 	ddt_key_fill(&dde_search.dde_key, bp);
641b24ab676SJeff Bonwick 
642b24ab676SJeff Bonwick 	dde = avl_find(&ddt->ddt_tree, &dde_search, &where);
643b24ab676SJeff Bonwick 	if (dde == NULL) {
644b24ab676SJeff Bonwick 		if (!add)
645b24ab676SJeff Bonwick 			return (NULL);
646b24ab676SJeff Bonwick 		dde = ddt_alloc(&dde_search.dde_key);
647b24ab676SJeff Bonwick 		avl_insert(&ddt->ddt_tree, dde, where);
648b24ab676SJeff Bonwick 	}
649b24ab676SJeff Bonwick 
650b24ab676SJeff Bonwick 	while (dde->dde_loading)
651b24ab676SJeff Bonwick 		cv_wait(&dde->dde_cv, &ddt->ddt_lock);
652b24ab676SJeff Bonwick 
653b24ab676SJeff Bonwick 	if (dde->dde_loaded)
654b24ab676SJeff Bonwick 		return (dde);
655b24ab676SJeff Bonwick 
656b24ab676SJeff Bonwick 	dde->dde_loading = B_TRUE;
657b24ab676SJeff Bonwick 
658b24ab676SJeff Bonwick 	ddt_exit(ddt);
659b24ab676SJeff Bonwick 
660b24ab676SJeff Bonwick 	error = ENOENT;
661b24ab676SJeff Bonwick 
662b24ab676SJeff Bonwick 	for (type = 0; type < DDT_TYPES; type++) {
663b24ab676SJeff Bonwick 		for (class = 0; class < DDT_CLASSES; class++) {
664b24ab676SJeff Bonwick 			error = ddt_object_lookup(ddt, type, class, dde);
665b24ab676SJeff Bonwick 			if (error != ENOENT)
666b24ab676SJeff Bonwick 				break;
667b24ab676SJeff Bonwick 		}
668b24ab676SJeff Bonwick 		if (error != ENOENT)
669b24ab676SJeff Bonwick 			break;
670b24ab676SJeff Bonwick 	}
671b24ab676SJeff Bonwick 
672b24ab676SJeff Bonwick 	ASSERT(error == 0 || error == ENOENT);
673b24ab676SJeff Bonwick 
674b24ab676SJeff Bonwick 	ddt_enter(ddt);
675b24ab676SJeff Bonwick 
676b24ab676SJeff Bonwick 	ASSERT(dde->dde_loaded == B_FALSE);
677b24ab676SJeff Bonwick 	ASSERT(dde->dde_loading == B_TRUE);
678b24ab676SJeff Bonwick 
679b24ab676SJeff Bonwick 	dde->dde_type = type;	/* will be DDT_TYPES if no entry found */
680b24ab676SJeff Bonwick 	dde->dde_class = class;	/* will be DDT_CLASSES if no entry found */
681b24ab676SJeff Bonwick 	dde->dde_loaded = B_TRUE;
682b24ab676SJeff Bonwick 	dde->dde_loading = B_FALSE;
683b24ab676SJeff Bonwick 
684b24ab676SJeff Bonwick 	if (error == 0)
685b24ab676SJeff Bonwick 		ddt_stat_update(ddt, dde, -1ULL);
686b24ab676SJeff Bonwick 
687b24ab676SJeff Bonwick 	cv_broadcast(&dde->dde_cv);
688b24ab676SJeff Bonwick 
689b24ab676SJeff Bonwick 	return (dde);
690b24ab676SJeff Bonwick }
691b24ab676SJeff Bonwick 
692b24ab676SJeff Bonwick int
693b24ab676SJeff Bonwick ddt_entry_compare(const void *x1, const void *x2)
694b24ab676SJeff Bonwick {
695b24ab676SJeff Bonwick 	const ddt_entry_t *dde1 = x1;
696b24ab676SJeff Bonwick 	const ddt_entry_t *dde2 = x2;
697b24ab676SJeff Bonwick 	const uint64_t *u1 = (const uint64_t *)&dde1->dde_key;
698b24ab676SJeff Bonwick 	const uint64_t *u2 = (const uint64_t *)&dde2->dde_key;
699b24ab676SJeff Bonwick 
700b24ab676SJeff Bonwick 	for (int i = 0; i < DDT_KEY_WORDS; i++) {
701b24ab676SJeff Bonwick 		if (u1[i] < u2[i])
702b24ab676SJeff Bonwick 			return (-1);
703b24ab676SJeff Bonwick 		if (u1[i] > u2[i])
704b24ab676SJeff Bonwick 			return (1);
705b24ab676SJeff Bonwick 	}
706b24ab676SJeff Bonwick 
707b24ab676SJeff Bonwick 	return (0);
708b24ab676SJeff Bonwick }
709b24ab676SJeff Bonwick 
710b24ab676SJeff Bonwick static ddt_t *
711b24ab676SJeff Bonwick ddt_table_alloc(spa_t *spa, enum zio_checksum c)
712b24ab676SJeff Bonwick {
713b24ab676SJeff Bonwick 	ddt_t *ddt;
714b24ab676SJeff Bonwick 
715b24ab676SJeff Bonwick 	ddt = kmem_zalloc(sizeof (*ddt), KM_SLEEP);
716b24ab676SJeff Bonwick 
717b24ab676SJeff Bonwick 	mutex_init(&ddt->ddt_lock, NULL, MUTEX_DEFAULT, NULL);
718b24ab676SJeff Bonwick 	avl_create(&ddt->ddt_tree, ddt_entry_compare,
719b24ab676SJeff Bonwick 	    sizeof (ddt_entry_t), offsetof(ddt_entry_t, dde_node));
720b24ab676SJeff Bonwick 	avl_create(&ddt->ddt_repair_tree, ddt_entry_compare,
721b24ab676SJeff Bonwick 	    sizeof (ddt_entry_t), offsetof(ddt_entry_t, dde_node));
722b24ab676SJeff Bonwick 	ddt->ddt_checksum = c;
723b24ab676SJeff Bonwick 	ddt->ddt_spa = spa;
724b24ab676SJeff Bonwick 	ddt->ddt_os = spa->spa_meta_objset;
725b24ab676SJeff Bonwick 
726b24ab676SJeff Bonwick 	return (ddt);
727b24ab676SJeff Bonwick }
728b24ab676SJeff Bonwick 
729b24ab676SJeff Bonwick static void
730b24ab676SJeff Bonwick ddt_table_free(ddt_t *ddt)
731b24ab676SJeff Bonwick {
732b24ab676SJeff Bonwick 	ASSERT(avl_numnodes(&ddt->ddt_tree) == 0);
733b24ab676SJeff Bonwick 	ASSERT(avl_numnodes(&ddt->ddt_repair_tree) == 0);
734b24ab676SJeff Bonwick 	avl_destroy(&ddt->ddt_tree);
735b24ab676SJeff Bonwick 	avl_destroy(&ddt->ddt_repair_tree);
736b24ab676SJeff Bonwick 	mutex_destroy(&ddt->ddt_lock);
737b24ab676SJeff Bonwick 	kmem_free(ddt, sizeof (*ddt));
738b24ab676SJeff Bonwick }
739b24ab676SJeff Bonwick 
740b24ab676SJeff Bonwick void
741b24ab676SJeff Bonwick ddt_create(spa_t *spa)
742b24ab676SJeff Bonwick {
743b24ab676SJeff Bonwick 	spa->spa_dedup_checksum = ZIO_DEDUPCHECKSUM;
744b24ab676SJeff Bonwick 
745b24ab676SJeff Bonwick 	for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++)
746b24ab676SJeff Bonwick 		spa->spa_ddt[c] = ddt_table_alloc(spa, c);
747b24ab676SJeff Bonwick }
748b24ab676SJeff Bonwick 
749b24ab676SJeff Bonwick int
750b24ab676SJeff Bonwick ddt_load(spa_t *spa)
751b24ab676SJeff Bonwick {
752b24ab676SJeff Bonwick 	int error;
753b24ab676SJeff Bonwick 
754b24ab676SJeff Bonwick 	ddt_create(spa);
755b24ab676SJeff Bonwick 
756b24ab676SJeff Bonwick 	error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
757b24ab676SJeff Bonwick 	    DMU_POOL_DDT_STATS, sizeof (uint64_t), 1,
758b24ab676SJeff Bonwick 	    &spa->spa_ddt_stat_object);
759b24ab676SJeff Bonwick 
760b24ab676SJeff Bonwick 	if (error)
761b24ab676SJeff Bonwick 		return (error == ENOENT ? 0 : error);
762b24ab676SJeff Bonwick 
763b24ab676SJeff Bonwick 	for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
764b24ab676SJeff Bonwick 		for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
765b24ab676SJeff Bonwick 			for (enum ddt_class class = 0; class < DDT_CLASSES;
766b24ab676SJeff Bonwick 			    class++) {
767b24ab676SJeff Bonwick 				ddt_t *ddt = spa->spa_ddt[c];
768b24ab676SJeff Bonwick 				error = ddt_object_load(ddt, type, class);
769b24ab676SJeff Bonwick 				if (error != 0 && error != ENOENT)
770b24ab676SJeff Bonwick 					return (error);
771b24ab676SJeff Bonwick 			}
772b24ab676SJeff Bonwick 		}
773b24ab676SJeff Bonwick 	}
774b24ab676SJeff Bonwick 
775b24ab676SJeff Bonwick 	return (0);
776b24ab676SJeff Bonwick }
777b24ab676SJeff Bonwick 
778b24ab676SJeff Bonwick void
779b24ab676SJeff Bonwick ddt_unload(spa_t *spa)
780b24ab676SJeff Bonwick {
781b24ab676SJeff Bonwick 	for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
782b24ab676SJeff Bonwick 		if (spa->spa_ddt[c]) {
783b24ab676SJeff Bonwick 			ddt_table_free(spa->spa_ddt[c]);
784b24ab676SJeff Bonwick 			spa->spa_ddt[c] = NULL;
785b24ab676SJeff Bonwick 		}
786b24ab676SJeff Bonwick 	}
787b24ab676SJeff Bonwick }
788b24ab676SJeff Bonwick 
789bbfd46c4SJeff Bonwick boolean_t
790bbfd46c4SJeff Bonwick ddt_class_contains(spa_t *spa, enum ddt_class max_class, const blkptr_t *bp)
791bbfd46c4SJeff Bonwick {
792bbfd46c4SJeff Bonwick 	ddt_t *ddt;
793bbfd46c4SJeff Bonwick 	ddt_entry_t dde;
794bbfd46c4SJeff Bonwick 
795bbfd46c4SJeff Bonwick 	if (!BP_GET_DEDUP(bp))
796bbfd46c4SJeff Bonwick 		return (B_FALSE);
797bbfd46c4SJeff Bonwick 
798bbfd46c4SJeff Bonwick 	if (max_class == DDT_CLASS_UNIQUE)
799bbfd46c4SJeff Bonwick 		return (B_TRUE);
800bbfd46c4SJeff Bonwick 
801bbfd46c4SJeff Bonwick 	ddt = spa->spa_ddt[BP_GET_CHECKSUM(bp)];
802bbfd46c4SJeff Bonwick 
803bbfd46c4SJeff Bonwick 	ddt_key_fill(&dde.dde_key, bp);
804bbfd46c4SJeff Bonwick 
805bbfd46c4SJeff Bonwick 	for (enum ddt_type type = 0; type < DDT_TYPES; type++)
806bbfd46c4SJeff Bonwick 		for (enum ddt_class class = 0; class <= max_class; class++)
807bbfd46c4SJeff Bonwick 			if (ddt_object_lookup(ddt, type, class, &dde) == 0)
808bbfd46c4SJeff Bonwick 				return (B_TRUE);
809bbfd46c4SJeff Bonwick 
810bbfd46c4SJeff Bonwick 	return (B_FALSE);
811bbfd46c4SJeff Bonwick }
812bbfd46c4SJeff Bonwick 
813b24ab676SJeff Bonwick ddt_entry_t *
814b24ab676SJeff Bonwick ddt_repair_start(ddt_t *ddt, const blkptr_t *bp)
815b24ab676SJeff Bonwick {
816b24ab676SJeff Bonwick 	ddt_key_t ddk;
817b24ab676SJeff Bonwick 	ddt_entry_t *dde;
818b24ab676SJeff Bonwick 
819b24ab676SJeff Bonwick 	ddt_key_fill(&ddk, bp);
820b24ab676SJeff Bonwick 
821b24ab676SJeff Bonwick 	dde = ddt_alloc(&ddk);
822b24ab676SJeff Bonwick 
823b24ab676SJeff Bonwick 	for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
824b24ab676SJeff Bonwick 		for (enum ddt_class class = 0; class < DDT_CLASSES; class++) {
825b24ab676SJeff Bonwick 			/*
826b24ab676SJeff Bonwick 			 * We can only do repair if there are multiple copies
827b24ab676SJeff Bonwick 			 * of the block.  For anything in the UNIQUE class,
828b24ab676SJeff Bonwick 			 * there's definitely only one copy, so don't even try.
829b24ab676SJeff Bonwick 			 */
830b24ab676SJeff Bonwick 			if (class != DDT_CLASS_UNIQUE &&
831b24ab676SJeff Bonwick 			    ddt_object_lookup(ddt, type, class, dde) == 0)
832b24ab676SJeff Bonwick 				return (dde);
833b24ab676SJeff Bonwick 		}
834b24ab676SJeff Bonwick 	}
835b24ab676SJeff Bonwick 
836b24ab676SJeff Bonwick 	bzero(dde->dde_phys, sizeof (dde->dde_phys));
837b24ab676SJeff Bonwick 
838b24ab676SJeff Bonwick 	return (dde);
839b24ab676SJeff Bonwick }
840b24ab676SJeff Bonwick 
841b24ab676SJeff Bonwick void
842b24ab676SJeff Bonwick ddt_repair_done(ddt_t *ddt, ddt_entry_t *dde)
843b24ab676SJeff Bonwick {
844b24ab676SJeff Bonwick 	avl_index_t where;
845b24ab676SJeff Bonwick 
846b24ab676SJeff Bonwick 	ddt_enter(ddt);
847b24ab676SJeff Bonwick 
848b24ab676SJeff Bonwick 	if (dde->dde_repair_data != NULL && spa_writeable(ddt->ddt_spa) &&
849b24ab676SJeff Bonwick 	    avl_find(&ddt->ddt_repair_tree, dde, &where) == NULL)
850b24ab676SJeff Bonwick 		avl_insert(&ddt->ddt_repair_tree, dde, where);
851b24ab676SJeff Bonwick 	else
852b24ab676SJeff Bonwick 		ddt_free(dde);
853b24ab676SJeff Bonwick 
854b24ab676SJeff Bonwick 	ddt_exit(ddt);
855b24ab676SJeff Bonwick }
856b24ab676SJeff Bonwick 
857b24ab676SJeff Bonwick static void
858b24ab676SJeff Bonwick ddt_repair_entry_done(zio_t *zio)
859b24ab676SJeff Bonwick {
860b24ab676SJeff Bonwick 	ddt_entry_t *rdde = zio->io_private;
861b24ab676SJeff Bonwick 
862b24ab676SJeff Bonwick 	ddt_free(rdde);
863b24ab676SJeff Bonwick }
864b24ab676SJeff Bonwick 
865b24ab676SJeff Bonwick static void
866b24ab676SJeff Bonwick ddt_repair_entry(ddt_t *ddt, ddt_entry_t *dde, ddt_entry_t *rdde, zio_t *rio)
867b24ab676SJeff Bonwick {
868b24ab676SJeff Bonwick 	ddt_phys_t *ddp = dde->dde_phys;
869b24ab676SJeff Bonwick 	ddt_phys_t *rddp = rdde->dde_phys;
870b24ab676SJeff Bonwick 	ddt_key_t *ddk = &dde->dde_key;
871b24ab676SJeff Bonwick 	ddt_key_t *rddk = &rdde->dde_key;
872b24ab676SJeff Bonwick 	zio_t *zio;
873b24ab676SJeff Bonwick 	blkptr_t blk;
874b24ab676SJeff Bonwick 
875b24ab676SJeff Bonwick 	zio = zio_null(rio, rio->io_spa, NULL,
876b24ab676SJeff Bonwick 	    ddt_repair_entry_done, rdde, rio->io_flags);
877b24ab676SJeff Bonwick 
878b24ab676SJeff Bonwick 	for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++, rddp++) {
879b24ab676SJeff Bonwick 		if (ddp->ddp_phys_birth == 0 ||
880b24ab676SJeff Bonwick 		    ddp->ddp_phys_birth != rddp->ddp_phys_birth ||
881b24ab676SJeff Bonwick 		    bcmp(ddp->ddp_dva, rddp->ddp_dva, sizeof (ddp->ddp_dva)))
882b24ab676SJeff Bonwick 			continue;
883bbfd46c4SJeff Bonwick 		ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk);
884b24ab676SJeff Bonwick 		zio_nowait(zio_rewrite(zio, zio->io_spa, 0, &blk,
885b24ab676SJeff Bonwick 		    rdde->dde_repair_data, DDK_GET_PSIZE(rddk), NULL, NULL,
886b24ab676SJeff Bonwick 		    ZIO_PRIORITY_SYNC_WRITE, ZIO_DDT_CHILD_FLAGS(zio), NULL));
887b24ab676SJeff Bonwick 	}
888b24ab676SJeff Bonwick 
889b24ab676SJeff Bonwick 	zio_nowait(zio);
890b24ab676SJeff Bonwick }
891b24ab676SJeff Bonwick 
892b24ab676SJeff Bonwick static void
893b24ab676SJeff Bonwick ddt_repair_table(ddt_t *ddt, zio_t *rio)
894b24ab676SJeff Bonwick {
895b24ab676SJeff Bonwick 	spa_t *spa = ddt->ddt_spa;
896b24ab676SJeff Bonwick 	ddt_entry_t *dde, *rdde_next, *rdde;
897b24ab676SJeff Bonwick 	avl_tree_t *t = &ddt->ddt_repair_tree;
898b24ab676SJeff Bonwick 	blkptr_t blk;
899b24ab676SJeff Bonwick 
900b24ab676SJeff Bonwick 	if (spa_sync_pass(spa) > 1)
901b24ab676SJeff Bonwick 		return;
902b24ab676SJeff Bonwick 
903b24ab676SJeff Bonwick 	ddt_enter(ddt);
904b24ab676SJeff Bonwick 	for (rdde = avl_first(t); rdde != NULL; rdde = rdde_next) {
905b24ab676SJeff Bonwick 		rdde_next = AVL_NEXT(t, rdde);
906b24ab676SJeff Bonwick 		avl_remove(&ddt->ddt_repair_tree, rdde);
907b24ab676SJeff Bonwick 		ddt_exit(ddt);
908bbfd46c4SJeff Bonwick 		ddt_bp_create(ddt->ddt_checksum, &rdde->dde_key, NULL, &blk);
909b24ab676SJeff Bonwick 		dde = ddt_repair_start(ddt, &blk);
910b24ab676SJeff Bonwick 		ddt_repair_entry(ddt, dde, rdde, rio);
911b24ab676SJeff Bonwick 		ddt_repair_done(ddt, dde);
912b24ab676SJeff Bonwick 		ddt_enter(ddt);
913b24ab676SJeff Bonwick 	}
914b24ab676SJeff Bonwick 	ddt_exit(ddt);
915b24ab676SJeff Bonwick }
916b24ab676SJeff Bonwick 
917b24ab676SJeff Bonwick static void
918b24ab676SJeff Bonwick ddt_sync_entry(ddt_t *ddt, ddt_entry_t *dde, dmu_tx_t *tx, uint64_t txg)
919b24ab676SJeff Bonwick {
920bbfd46c4SJeff Bonwick 	dsl_pool_t *dp = ddt->ddt_spa->spa_dsl_pool;
921b24ab676SJeff Bonwick 	ddt_phys_t *ddp = dde->dde_phys;
922b24ab676SJeff Bonwick 	ddt_key_t *ddk = &dde->dde_key;
923b24ab676SJeff Bonwick 	enum ddt_type otype = dde->dde_type;
924b24ab676SJeff Bonwick 	enum ddt_type ntype = DDT_TYPE_CURRENT;
925b24ab676SJeff Bonwick 	enum ddt_class oclass = dde->dde_class;
926b24ab676SJeff Bonwick 	enum ddt_class nclass;
927b24ab676SJeff Bonwick 	uint64_t total_refcnt = 0;
928b24ab676SJeff Bonwick 
929b24ab676SJeff Bonwick 	ASSERT(dde->dde_loaded);
930b24ab676SJeff Bonwick 	ASSERT(!dde->dde_loading);
931b24ab676SJeff Bonwick 
932b24ab676SJeff Bonwick 	for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
933b24ab676SJeff Bonwick 		ASSERT(dde->dde_lead_zio[p] == NULL);
934b24ab676SJeff Bonwick 		ASSERT((int64_t)ddp->ddp_refcnt >= 0);
935b24ab676SJeff Bonwick 		if (ddp->ddp_phys_birth == 0) {
936b24ab676SJeff Bonwick 			ASSERT(ddp->ddp_refcnt == 0);
937b24ab676SJeff Bonwick 			continue;
938b24ab676SJeff Bonwick 		}
939b24ab676SJeff Bonwick 		if (p == DDT_PHYS_DITTO) {
940b24ab676SJeff Bonwick 			if (ddt_ditto_copies_needed(ddt, dde, NULL) == 0)
941b24ab676SJeff Bonwick 				ddt_phys_free(ddt, ddk, ddp, txg);
942b24ab676SJeff Bonwick 			continue;
943b24ab676SJeff Bonwick 		}
944b24ab676SJeff Bonwick 		if (ddp->ddp_refcnt == 0)
945b24ab676SJeff Bonwick 			ddt_phys_free(ddt, ddk, ddp, txg);
946b24ab676SJeff Bonwick 		total_refcnt += ddp->ddp_refcnt;
947b24ab676SJeff Bonwick 	}
948b24ab676SJeff Bonwick 
949b24ab676SJeff Bonwick 	if (dde->dde_phys[DDT_PHYS_DITTO].ddp_phys_birth != 0)
950b24ab676SJeff Bonwick 		nclass = DDT_CLASS_DITTO;
951b24ab676SJeff Bonwick 	else if (total_refcnt > 1)
952b24ab676SJeff Bonwick 		nclass = DDT_CLASS_DUPLICATE;
953b24ab676SJeff Bonwick 	else
954b24ab676SJeff Bonwick 		nclass = DDT_CLASS_UNIQUE;
955b24ab676SJeff Bonwick 
956b24ab676SJeff Bonwick 	if (otype != DDT_TYPES &&
957b24ab676SJeff Bonwick 	    (otype != ntype || oclass != nclass || total_refcnt == 0)) {
958b24ab676SJeff Bonwick 		VERIFY(ddt_object_remove(ddt, otype, oclass, dde, tx) == 0);
959b24ab676SJeff Bonwick 		ASSERT(ddt_object_lookup(ddt, otype, oclass, dde) == ENOENT);
960b24ab676SJeff Bonwick 	}
961b24ab676SJeff Bonwick 
962b24ab676SJeff Bonwick 	if (total_refcnt != 0) {
963b24ab676SJeff Bonwick 		dde->dde_type = ntype;
964b24ab676SJeff Bonwick 		dde->dde_class = nclass;
965b24ab676SJeff Bonwick 		ddt_stat_update(ddt, dde, 0);
966b24ab676SJeff Bonwick 		if (!ddt_object_exists(ddt, ntype, nclass))
967b24ab676SJeff Bonwick 			ddt_object_create(ddt, ntype, nclass, tx);
968b24ab676SJeff Bonwick 		VERIFY(ddt_object_update(ddt, ntype, nclass, dde, tx) == 0);
969bbfd46c4SJeff Bonwick 
970bbfd46c4SJeff Bonwick 		if (dp->dp_scrub_func != SCRUB_FUNC_NONE &&
971bbfd46c4SJeff Bonwick 		    oclass > dp->dp_scrub_ddt_class_max &&
972bbfd46c4SJeff Bonwick 		    nclass <= dp->dp_scrub_ddt_class_max)
973bbfd46c4SJeff Bonwick 			dsl_pool_scrub_ddt_entry(dp, ddt->ddt_checksum, dde);
974b24ab676SJeff Bonwick 	}
975b24ab676SJeff Bonwick }
976b24ab676SJeff Bonwick 
977b24ab676SJeff Bonwick static void
978b24ab676SJeff Bonwick ddt_sync_table(ddt_t *ddt, dmu_tx_t *tx, uint64_t txg)
979b24ab676SJeff Bonwick {
980b24ab676SJeff Bonwick 	spa_t *spa = ddt->ddt_spa;
981b24ab676SJeff Bonwick 	ddt_entry_t *dde;
982b24ab676SJeff Bonwick 	void *cookie = NULL;
983b24ab676SJeff Bonwick 
984b24ab676SJeff Bonwick 	if (avl_numnodes(&ddt->ddt_tree) == 0)
985b24ab676SJeff Bonwick 		return;
986b24ab676SJeff Bonwick 
987b24ab676SJeff Bonwick 	ASSERT(spa_sync_pass(spa) == 1);
988b24ab676SJeff Bonwick 	ASSERT(spa->spa_uberblock.ub_version >= SPA_VERSION_DEDUP);
989b24ab676SJeff Bonwick 
990b24ab676SJeff Bonwick 	if (spa->spa_ddt_stat_object == 0) {
991b24ab676SJeff Bonwick 		spa->spa_ddt_stat_object = zap_create(ddt->ddt_os,
992b24ab676SJeff Bonwick 		    DMU_OT_DDT_STATS, DMU_OT_NONE, 0, tx);
993b24ab676SJeff Bonwick 		VERIFY(zap_add(ddt->ddt_os, DMU_POOL_DIRECTORY_OBJECT,
994b24ab676SJeff Bonwick 		    DMU_POOL_DDT_STATS, sizeof (uint64_t), 1,
995b24ab676SJeff Bonwick 		    &spa->spa_ddt_stat_object, tx) == 0);
996b24ab676SJeff Bonwick 	}
997b24ab676SJeff Bonwick 
998b24ab676SJeff Bonwick 	while ((dde = avl_destroy_nodes(&ddt->ddt_tree, &cookie)) != NULL) {
999b24ab676SJeff Bonwick 		ddt_sync_entry(ddt, dde, tx, txg);
1000b24ab676SJeff Bonwick 		ddt_free(dde);
1001b24ab676SJeff Bonwick 	}
1002b24ab676SJeff Bonwick 
1003b24ab676SJeff Bonwick 	for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
1004b24ab676SJeff Bonwick 		for (enum ddt_class class = 0; class < DDT_CLASSES; class++) {
1005b24ab676SJeff Bonwick 			if (!ddt_object_exists(ddt, type, class))
1006b24ab676SJeff Bonwick 				continue;
1007b24ab676SJeff Bonwick 			ddt_object_sync(ddt, type, class, tx);
1008b24ab676SJeff Bonwick 			if (ddt_object_count(ddt, type, class) == 0)
1009b24ab676SJeff Bonwick 				ddt_object_destroy(ddt, type, class, tx);
1010b24ab676SJeff Bonwick 		}
1011b24ab676SJeff Bonwick 	}
1012b24ab676SJeff Bonwick }
1013b24ab676SJeff Bonwick 
1014b24ab676SJeff Bonwick void
1015b24ab676SJeff Bonwick ddt_sync(spa_t *spa, uint64_t txg)
1016b24ab676SJeff Bonwick {
1017b24ab676SJeff Bonwick 	dmu_tx_t *tx;
1018b24ab676SJeff Bonwick 	zio_t *rio = zio_root(spa, NULL, NULL,
1019b24ab676SJeff Bonwick 	    ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE);
1020b24ab676SJeff Bonwick 
1021b24ab676SJeff Bonwick 	ASSERT(spa_syncing_txg(spa) == txg);
1022b24ab676SJeff Bonwick 
1023b24ab676SJeff Bonwick 	tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
1024b24ab676SJeff Bonwick 
1025b24ab676SJeff Bonwick 	for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
1026b24ab676SJeff Bonwick 		ddt_t *ddt = spa->spa_ddt[c];
1027b24ab676SJeff Bonwick 		if (ddt == NULL)
1028b24ab676SJeff Bonwick 			continue;
1029b24ab676SJeff Bonwick 		ddt_sync_table(ddt, tx, txg);
1030b24ab676SJeff Bonwick 		ddt_repair_table(ddt, rio);
1031b24ab676SJeff Bonwick 	}
1032b24ab676SJeff Bonwick 
1033b24ab676SJeff Bonwick 	(void) zio_wait(rio);
1034b24ab676SJeff Bonwick 
1035b24ab676SJeff Bonwick 	dmu_tx_commit(tx);
1036b24ab676SJeff Bonwick }
1037bbfd46c4SJeff Bonwick 
1038bbfd46c4SJeff Bonwick int
1039bbfd46c4SJeff Bonwick ddt_walk(spa_t *spa, ddt_bookmark_t *ddb, ddt_entry_t *dde)
1040bbfd46c4SJeff Bonwick {
1041bbfd46c4SJeff Bonwick 	do {
1042bbfd46c4SJeff Bonwick 		do {
1043bbfd46c4SJeff Bonwick 			do {
1044bbfd46c4SJeff Bonwick 				ddt_t *ddt = spa->spa_ddt[ddb->ddb_checksum];
1045bbfd46c4SJeff Bonwick 				int error = ENOENT;
1046bbfd46c4SJeff Bonwick 				if (ddt_object_exists(ddt, ddb->ddb_type,
1047bbfd46c4SJeff Bonwick 				    ddb->ddb_class)) {
1048bbfd46c4SJeff Bonwick 					error = ddt_object_walk(ddt,
1049bbfd46c4SJeff Bonwick 					    ddb->ddb_type, ddb->ddb_class,
1050bbfd46c4SJeff Bonwick 					    &ddb->ddb_cursor, dde);
1051bbfd46c4SJeff Bonwick 				}
1052bbfd46c4SJeff Bonwick 				if (error == 0)
1053bbfd46c4SJeff Bonwick 					return (0);
1054bbfd46c4SJeff Bonwick 				if (error != ENOENT)
1055bbfd46c4SJeff Bonwick 					return (error);
1056bbfd46c4SJeff Bonwick 				ddb->ddb_cursor = 0;
1057bbfd46c4SJeff Bonwick 			} while (++ddb->ddb_checksum < ZIO_CHECKSUM_FUNCTIONS);
1058bbfd46c4SJeff Bonwick 			ddb->ddb_checksum = 0;
1059bbfd46c4SJeff Bonwick 		} while (++ddb->ddb_type < DDT_TYPES);
1060bbfd46c4SJeff Bonwick 		ddb->ddb_type = 0;
1061bbfd46c4SJeff Bonwick 	} while (++ddb->ddb_class < DDT_CLASSES);
1062bbfd46c4SJeff Bonwick 
1063bbfd46c4SJeff Bonwick 	return (ENOENT);
1064bbfd46c4SJeff Bonwick }
1065