4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2018 by Delphix. All rights reserved.
27 #include <sys/zfs_context.h>
32 #include <sys/dmu_tx.h>
34 int ddt_zap_leaf_blockshift = 12;
35 int ddt_zap_indirect_blockshift = 12;
38 ddt_zap_create(objset_t *os, uint64_t *objectp, dmu_tx_t *tx, boolean_t prehash)
40 zap_flags_t flags = ZAP_FLAG_HASH64 | ZAP_FLAG_UINT64_KEY;
43 flags |= ZAP_FLAG_PRE_HASHED_KEY;
45 *objectp = zap_create_flags(os, 0, flags, DMU_OT_DDT_ZAP,
46 ddt_zap_leaf_blockshift, ddt_zap_indirect_blockshift,
49 return (*objectp == 0 ? SET_ERROR(ENOTSUP) : 0);
53 ddt_zap_destroy(objset_t *os, uint64_t object, dmu_tx_t *tx)
55 return (zap_destroy(os, object, tx));
59 ddt_zap_lookup(objset_t *os, uint64_t object, ddt_entry_t *dde)
65 cbuf = kmem_alloc(sizeof (dde->dde_phys) + 1, KM_SLEEP);
67 error = zap_length_uint64(os, object, (uint64_t *)&dde->dde_key,
68 DDT_KEY_WORDS, &one, &csize);
73 ASSERT(csize <= (sizeof (dde->dde_phys) + 1));
75 error = zap_lookup_uint64(os, object, (uint64_t *)&dde->dde_key,
76 DDT_KEY_WORDS, 1, csize, cbuf);
80 ddt_decompress(cbuf, dde->dde_phys, csize, sizeof (dde->dde_phys));
82 kmem_free(cbuf, sizeof (dde->dde_phys) + 1);
88 ddt_zap_prefetch(objset_t *os, uint64_t object, ddt_entry_t *dde)
90 (void) zap_prefetch_uint64(os, object, (uint64_t *)&dde->dde_key,
95 ddt_zap_update(objset_t *os, uint64_t object, ddt_entry_t *dde, dmu_tx_t *tx)
97 uchar_t cbuf[sizeof (dde->dde_phys) + 1];
100 csize = ddt_compress(dde->dde_phys, cbuf,
101 sizeof (dde->dde_phys), sizeof (cbuf));
103 return (zap_update_uint64(os, object, (uint64_t *)&dde->dde_key,
104 DDT_KEY_WORDS, 1, csize, cbuf, tx));
108 ddt_zap_remove(objset_t *os, uint64_t object, ddt_entry_t *dde, dmu_tx_t *tx)
110 return (zap_remove_uint64(os, object, (uint64_t *)&dde->dde_key,
115 ddt_zap_walk(objset_t *os, uint64_t object, ddt_entry_t *dde, uint64_t *walk)
123 * We don't want to prefetch the entire ZAP object, because
124 * it can be enormous. Also the primary use of DDT iteration
125 * is for scrubbing, in which case we will be issuing many
126 * scrub I/Os for each ZAP block that we read in, so
127 * reading the ZAP is unlikely to be the bottleneck.
129 zap_cursor_init_noprefetch(&zc, os, object);
131 zap_cursor_init_serialized(&zc, os, object, *walk);
133 if ((error = zap_cursor_retrieve(&zc, &za)) == 0) {
134 uchar_t cbuf[sizeof (dde->dde_phys) + 1];
135 uint64_t csize = za.za_num_integers;
136 ASSERT(za.za_integer_length == 1);
137 error = zap_lookup_uint64(os, object, (uint64_t *)za.za_name,
138 DDT_KEY_WORDS, 1, csize, cbuf);
141 ddt_decompress(cbuf, dde->dde_phys, csize,
142 sizeof (dde->dde_phys));
143 dde->dde_key = *(ddt_key_t *)za.za_name;
145 zap_cursor_advance(&zc);
146 *walk = zap_cursor_serialize(&zc);
148 zap_cursor_fini(&zc);
153 ddt_zap_count(objset_t *os, uint64_t object, uint64_t *count)
155 return (zap_count(os, object, count));
158 const ddt_ops_t ddt_zap_ops = {