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 https://opensource.org/licenses/CDDL-1.0. 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 * Copyright (c) 2018 by Delphix. All rights reserved. 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/ddt_impl.h> 32 #include <sys/zap.h> 33 #include <sys/dmu_tx.h> 34 #include <sys/zio_compress.h> 35 36 static unsigned int ddt_zap_default_bs = 15; 37 static unsigned int ddt_zap_default_ibs = 15; 38 39 #define DDT_ZAP_COMPRESS_BYTEORDER_MASK 0x80 40 #define DDT_ZAP_COMPRESS_FUNCTION_MASK 0x7f 41 42 #define DDT_KEY_WORDS (sizeof (ddt_key_t) / sizeof (uint64_t)) 43 44 static size_t 45 ddt_zap_compress(const void *src, uchar_t *dst, size_t s_len, size_t d_len) 46 { 47 uchar_t *version = dst++; 48 int cpfunc = ZIO_COMPRESS_ZLE; 49 zio_compress_info_t *ci = &zio_compress_table[cpfunc]; 50 size_t c_len; 51 52 ASSERT3U(d_len, >=, s_len + 1); /* no compression plus version byte */ 53 54 c_len = ci->ci_compress((void *)src, dst, s_len, d_len - 1, 55 ci->ci_level); 56 57 if (c_len == s_len) { 58 cpfunc = ZIO_COMPRESS_OFF; 59 memcpy(dst, src, s_len); 60 } 61 62 *version = cpfunc; 63 if (ZFS_HOST_BYTEORDER) 64 *version |= DDT_ZAP_COMPRESS_BYTEORDER_MASK; 65 66 return (c_len + 1); 67 } 68 69 static void 70 ddt_zap_decompress(uchar_t *src, void *dst, size_t s_len, size_t d_len) 71 { 72 uchar_t version = *src++; 73 int cpfunc = version & DDT_ZAP_COMPRESS_FUNCTION_MASK; 74 zio_compress_info_t *ci = &zio_compress_table[cpfunc]; 75 76 if (ci->ci_decompress != NULL) 77 (void) ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level); 78 else 79 memcpy(dst, src, d_len); 80 81 if (((version & DDT_ZAP_COMPRESS_BYTEORDER_MASK) != 0) != 82 (ZFS_HOST_BYTEORDER != 0)) 83 byteswap_uint64_array(dst, d_len); 84 } 85 86 static int 87 ddt_zap_create(objset_t *os, uint64_t *objectp, dmu_tx_t *tx, boolean_t prehash) 88 { 89 zap_flags_t flags = ZAP_FLAG_HASH64 | ZAP_FLAG_UINT64_KEY; 90 91 if (prehash) 92 flags |= ZAP_FLAG_PRE_HASHED_KEY; 93 94 *objectp = zap_create_flags(os, 0, flags, DMU_OT_DDT_ZAP, 95 ddt_zap_default_bs, ddt_zap_default_ibs, 96 DMU_OT_NONE, 0, tx); 97 if (*objectp == 0) 98 return (SET_ERROR(ENOTSUP)); 99 100 return (0); 101 } 102 103 static int 104 ddt_zap_destroy(objset_t *os, uint64_t object, dmu_tx_t *tx) 105 { 106 return (zap_destroy(os, object, tx)); 107 } 108 109 static int 110 ddt_zap_lookup(objset_t *os, uint64_t object, 111 const ddt_key_t *ddk, ddt_phys_t *phys, size_t psize) 112 { 113 uchar_t *cbuf; 114 uint64_t one, csize; 115 int error; 116 117 error = zap_length_uint64(os, object, (uint64_t *)ddk, 118 DDT_KEY_WORDS, &one, &csize); 119 if (error) 120 return (error); 121 122 ASSERT3U(one, ==, 1); 123 ASSERT3U(csize, <=, psize + 1); 124 125 cbuf = kmem_alloc(csize, KM_SLEEP); 126 127 error = zap_lookup_uint64(os, object, (uint64_t *)ddk, 128 DDT_KEY_WORDS, 1, csize, cbuf); 129 if (error == 0) 130 ddt_zap_decompress(cbuf, phys, csize, psize); 131 132 kmem_free(cbuf, csize); 133 134 return (error); 135 } 136 137 static int 138 ddt_zap_contains(objset_t *os, uint64_t object, const ddt_key_t *ddk) 139 { 140 return (zap_length_uint64(os, object, (uint64_t *)ddk, DDT_KEY_WORDS, 141 NULL, NULL)); 142 } 143 144 static void 145 ddt_zap_prefetch(objset_t *os, uint64_t object, const ddt_key_t *ddk) 146 { 147 (void) zap_prefetch_uint64(os, object, (uint64_t *)ddk, DDT_KEY_WORDS); 148 } 149 150 static int 151 ddt_zap_update(objset_t *os, uint64_t object, const ddt_key_t *ddk, 152 const ddt_phys_t *phys, size_t psize, dmu_tx_t *tx) 153 { 154 const size_t cbuf_size = psize + 1; 155 156 uchar_t *cbuf = kmem_alloc(cbuf_size, KM_SLEEP); 157 158 uint64_t csize = ddt_zap_compress(phys, cbuf, psize, cbuf_size); 159 160 int error = zap_update_uint64(os, object, (uint64_t *)ddk, 161 DDT_KEY_WORDS, 1, csize, cbuf, tx); 162 163 kmem_free(cbuf, cbuf_size); 164 165 return (error); 166 } 167 168 static int 169 ddt_zap_remove(objset_t *os, uint64_t object, const ddt_key_t *ddk, 170 dmu_tx_t *tx) 171 { 172 return (zap_remove_uint64(os, object, (uint64_t *)ddk, 173 DDT_KEY_WORDS, tx)); 174 } 175 176 static int 177 ddt_zap_walk(objset_t *os, uint64_t object, uint64_t *walk, ddt_key_t *ddk, 178 ddt_phys_t *phys, size_t psize) 179 { 180 zap_cursor_t zc; 181 zap_attribute_t za; 182 int error; 183 184 if (*walk == 0) { 185 /* 186 * We don't want to prefetch the entire ZAP object, because 187 * it can be enormous. Also the primary use of DDT iteration 188 * is for scrubbing, in which case we will be issuing many 189 * scrub I/Os for each ZAP block that we read in, so 190 * reading the ZAP is unlikely to be the bottleneck. 191 */ 192 zap_cursor_init_noprefetch(&zc, os, object); 193 } else { 194 zap_cursor_init_serialized(&zc, os, object, *walk); 195 } 196 if ((error = zap_cursor_retrieve(&zc, &za)) == 0) { 197 uint64_t csize = za.za_num_integers; 198 199 ASSERT3U(za.za_integer_length, ==, 1); 200 ASSERT3U(csize, <=, psize + 1); 201 202 uchar_t *cbuf = kmem_alloc(csize, KM_SLEEP); 203 204 error = zap_lookup_uint64(os, object, (uint64_t *)za.za_name, 205 DDT_KEY_WORDS, 1, csize, cbuf); 206 ASSERT0(error); 207 if (error == 0) { 208 ddt_zap_decompress(cbuf, phys, csize, psize); 209 *ddk = *(ddt_key_t *)za.za_name; 210 } 211 212 kmem_free(cbuf, csize); 213 214 zap_cursor_advance(&zc); 215 *walk = zap_cursor_serialize(&zc); 216 } 217 zap_cursor_fini(&zc); 218 return (error); 219 } 220 221 static int 222 ddt_zap_count(objset_t *os, uint64_t object, uint64_t *count) 223 { 224 return (zap_count(os, object, count)); 225 } 226 227 const ddt_ops_t ddt_zap_ops = { 228 "zap", 229 ddt_zap_create, 230 ddt_zap_destroy, 231 ddt_zap_lookup, 232 ddt_zap_contains, 233 ddt_zap_prefetch, 234 ddt_zap_update, 235 ddt_zap_remove, 236 ddt_zap_walk, 237 ddt_zap_count, 238 }; 239 240 /* BEGIN CSTYLED */ 241 ZFS_MODULE_PARAM(zfs_dedup, , ddt_zap_default_bs, UINT, ZMOD_RW, 242 "DDT ZAP leaf blockshift"); 243 ZFS_MODULE_PARAM(zfs_dedup, , ddt_zap_default_ibs, UINT, ZMOD_RW, 244 "DDT ZAP indirect blockshift"); 245 /* END CSTYLED */ 246