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 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 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 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 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 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 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 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 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