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