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