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