xref: /titanic_44/usr/src/uts/common/fs/zfs/ddt_zap.c (revision 56b2bdd1f04d465cfe4a95b88ae5cba5884154e4)
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 };
158