1 /*
2 * CDDL HEADER START
3 *
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.
7 *
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.
12 *
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]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26 #include <sys/zfs_context.h>
27 #include <sys/spa.h>
28 #include <sys/zio.h>
29 #include <sys/ddt.h>
30 #include <sys/zap.h>
31 #include <sys/dmu_tx.h>
32 #include <util/sscanf.h>
33
34 int ddt_zap_leaf_blockshift = 12;
35 int ddt_zap_indirect_blockshift = 12;
36
37 static int
38 ddt_zap_create(objset_t *os, uint64_t *objectp, dmu_tx_t *tx, boolean_t prehash)
39 {
40 zap_flags_t flags = ZAP_FLAG_HASH64 | ZAP_FLAG_UINT64_KEY;
41
42 if (prehash)
43 flags |= ZAP_FLAG_PRE_HASHED_KEY;
44
45 *objectp = zap_create_flags(os, 0, flags, DMU_OT_DDT_ZAP,
46 ddt_zap_leaf_blockshift, ddt_zap_indirect_blockshift,
47 DMU_OT_NONE, 0, tx);
48
49 return (*objectp == 0 ? ENOTSUP : 0);
50 }
51
52 static int
53 ddt_zap_destroy(objset_t *os, uint64_t object, dmu_tx_t *tx)
54 {
55 return (zap_destroy(os, object, tx));
56 }
57
58 static int
59 ddt_zap_lookup(objset_t *os, uint64_t object, ddt_entry_t *dde)
60 {
61 uchar_t cbuf[sizeof (dde->dde_phys) + 1];
62 uint64_t one, csize;
63 int error;
64
65 error = zap_length_uint64(os, object, (uint64_t *)&dde->dde_key,
66 DDT_KEY_WORDS, &one, &csize);
67 if (error)
68 return (error);
69
70 ASSERT(one == 1);
71 ASSERT(csize <= sizeof (cbuf));
72
73 error = zap_lookup_uint64(os, object, (uint64_t *)&dde->dde_key,
74 DDT_KEY_WORDS, 1, csize, cbuf);
75 if (error)
76 return (error);
77
78 ddt_decompress(cbuf, dde->dde_phys, csize, sizeof (dde->dde_phys));
79
80 return (0);
81 }
82
83 static void
84 ddt_zap_prefetch(objset_t *os, uint64_t object, ddt_entry_t *dde)
85 {
86 (void) zap_prefetch_uint64(os, object, (uint64_t *)&dde->dde_key,
87 DDT_KEY_WORDS);
88 }
89
90 static int
91 ddt_zap_update(objset_t *os, uint64_t object, ddt_entry_t *dde, dmu_tx_t *tx)
92 {
93 uchar_t cbuf[sizeof (dde->dde_phys) + 1];
94 uint64_t csize;
95
96 csize = ddt_compress(dde->dde_phys, cbuf,
97 sizeof (dde->dde_phys), sizeof (cbuf));
98
99 return (zap_update_uint64(os, object, (uint64_t *)&dde->dde_key,
100 DDT_KEY_WORDS, 1, csize, cbuf, tx));
101 }
102
103 static int
104 ddt_zap_remove(objset_t *os, uint64_t object, ddt_entry_t *dde, dmu_tx_t *tx)
105 {
106 return (zap_remove_uint64(os, object, (uint64_t *)&dde->dde_key,
107 DDT_KEY_WORDS, tx));
108 }
109
110 static int
111 ddt_zap_walk(objset_t *os, uint64_t object, ddt_entry_t *dde, uint64_t *walk)
112 {
113 zap_cursor_t zc;
114 zap_attribute_t za;
115 int error;
116
117 zap_cursor_init_serialized(&zc, os, object, *walk);
118 if ((error = zap_cursor_retrieve(&zc, &za)) == 0) {
119 uchar_t cbuf[sizeof (dde->dde_phys) + 1];
120 uint64_t csize = za.za_num_integers;
121 ASSERT(za.za_integer_length == 1);
122 error = zap_lookup_uint64(os, object, (uint64_t *)za.za_name,
123 DDT_KEY_WORDS, 1, csize, cbuf);
124 ASSERT(error == 0);
125 if (error == 0) {
126 ddt_decompress(cbuf, dde->dde_phys, csize,
127 sizeof (dde->dde_phys));
128 dde->dde_key = *(ddt_key_t *)za.za_name;
129 }
130 zap_cursor_advance(&zc);
131 *walk = zap_cursor_serialize(&zc);
132 }
133 zap_cursor_fini(&zc);
134 return (error);
135 }
136
137 static uint64_t
138 ddt_zap_count(objset_t *os, uint64_t object)
139 {
140 uint64_t count = 0;
141
142 VERIFY(zap_count(os, object, &count) == 0);
143
144 return (count);
145 }
146
147 const ddt_ops_t ddt_zap_ops = {
148 "zap",
149 ddt_zap_create,
150 ddt_zap_destroy,
151 ddt_zap_lookup,
152 ddt_zap_prefetch,
153 ddt_zap_update,
154 ddt_zap_remove,
155 ddt_zap_walk,
156 ddt_zap_count,
157 };