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 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SYS_DDT_H 27 #define _SYS_DDT_H 28 29 #include <sys/sysmacros.h> 30 #include <sys/types.h> 31 #include <sys/fs/zfs.h> 32 #include <sys/zio.h> 33 #include <sys/dmu.h> 34 35 #ifdef __cplusplus 36 extern "C" { 37 #endif 38 39 /* 40 * On-disk DDT formats, in the desired search order (newest version first). 41 */ 42 enum ddt_type { 43 DDT_TYPE_ZAP = 0, 44 DDT_TYPES 45 }; 46 47 /* 48 * DDT classes, in the desired search order (highest replication level first). 49 */ 50 enum ddt_class { 51 DDT_CLASS_DITTO = 0, 52 DDT_CLASS_DUPLICATE, 53 DDT_CLASS_UNIQUE, 54 DDT_CLASSES 55 }; 56 57 #define DDT_TYPE_CURRENT 0 58 59 #define DDT_COMPRESS_BYTEORDER_MASK 0x80 60 #define DDT_COMPRESS_FUNCTION_MASK 0x7f 61 62 /* 63 * On-disk ddt entry: key (name) and physical storage (value). 64 */ 65 typedef struct ddt_key { 66 zio_cksum_t ddk_cksum; /* 256-bit block checksum */ 67 uint64_t ddk_prop; /* LSIZE, PSIZE, compression */ 68 } ddt_key_t; 69 70 /* 71 * ddk_prop layout: 72 * 73 * +-------+-------+-------+-------+-------+-------+-------+-------+ 74 * | 0 | 0 | 0 | comp | PSIZE | LSIZE | 75 * +-------+-------+-------+-------+-------+-------+-------+-------+ 76 */ 77 #define DDK_GET_LSIZE(ddk) \ 78 BF64_GET_SB((ddk)->ddk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1) 79 #define DDK_SET_LSIZE(ddk, x) \ 80 BF64_SET_SB((ddk)->ddk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1, x) 81 82 #define DDK_GET_PSIZE(ddk) \ 83 BF64_GET_SB((ddk)->ddk_prop, 16, 16, SPA_MINBLOCKSHIFT, 1) 84 #define DDK_SET_PSIZE(ddk, x) \ 85 BF64_SET_SB((ddk)->ddk_prop, 16, 16, SPA_MINBLOCKSHIFT, 1, x) 86 87 #define DDK_GET_COMPRESS(ddk) BF64_GET((ddk)->ddk_prop, 32, 8) 88 #define DDK_SET_COMPRESS(ddk, x) BF64_SET((ddk)->ddk_prop, 32, 8, x) 89 90 #define DDT_KEY_WORDS (sizeof (ddt_key_t) / sizeof (uint64_t)) 91 92 typedef struct ddt_phys { 93 dva_t ddp_dva[SPA_DVAS_PER_BP]; 94 uint64_t ddp_refcnt; 95 uint64_t ddp_phys_birth; 96 } ddt_phys_t; 97 98 enum ddt_phys_type { 99 DDT_PHYS_DITTO = 0, 100 DDT_PHYS_SINGLE = 1, 101 DDT_PHYS_DOUBLE = 2, 102 DDT_PHYS_TRIPLE = 3, 103 DDT_PHYS_TYPES 104 }; 105 106 /* 107 * In-core ddt entry 108 */ 109 struct ddt_entry { 110 ddt_key_t dde_key; 111 ddt_phys_t dde_phys[DDT_PHYS_TYPES]; 112 zio_t *dde_lead_zio[DDT_PHYS_TYPES]; 113 void *dde_repair_data; 114 enum ddt_type dde_type; 115 enum ddt_class dde_class; 116 uint8_t dde_loading; 117 uint8_t dde_loaded; 118 kcondvar_t dde_cv; 119 avl_node_t dde_node; 120 }; 121 122 /* 123 * In-core ddt 124 */ 125 struct ddt { 126 kmutex_t ddt_lock; 127 avl_tree_t ddt_tree; 128 avl_tree_t ddt_repair_tree; 129 enum zio_checksum ddt_checksum; 130 spa_t *ddt_spa; 131 objset_t *ddt_os; 132 uint64_t ddt_stat_object; 133 uint64_t ddt_object[DDT_TYPES][DDT_CLASSES]; 134 ddt_histogram_t ddt_histogram[DDT_TYPES][DDT_CLASSES]; 135 ddt_histogram_t ddt_histogram_cache[DDT_TYPES][DDT_CLASSES]; 136 ddt_object_t ddt_object_stats[DDT_TYPES][DDT_CLASSES]; 137 avl_node_t ddt_node; 138 }; 139 140 /* 141 * In-core and on-disk bookmark for DDT walks 142 */ 143 typedef struct ddt_bookmark { 144 uint64_t ddb_class; 145 uint64_t ddb_type; 146 uint64_t ddb_checksum; 147 uint64_t ddb_cursor; 148 } ddt_bookmark_t; 149 150 /* 151 * Ops vector to access a specific DDT object type. 152 */ 153 typedef struct ddt_ops { 154 char ddt_op_name[32]; 155 int (*ddt_op_create)(objset_t *os, uint64_t *object, dmu_tx_t *tx, 156 boolean_t prehash); 157 int (*ddt_op_destroy)(objset_t *os, uint64_t object, dmu_tx_t *tx); 158 int (*ddt_op_lookup)(objset_t *os, uint64_t object, ddt_entry_t *dde); 159 int (*ddt_op_update)(objset_t *os, uint64_t object, ddt_entry_t *dde, 160 dmu_tx_t *tx); 161 int (*ddt_op_remove)(objset_t *os, uint64_t object, ddt_entry_t *dde, 162 dmu_tx_t *tx); 163 int (*ddt_op_walk)(objset_t *os, uint64_t object, ddt_entry_t *dde, 164 uint64_t *walk); 165 uint64_t (*ddt_op_count)(objset_t *os, uint64_t object); 166 } ddt_ops_t; 167 168 #define DDT_NAMELEN 80 169 170 extern void ddt_object_name(ddt_t *ddt, enum ddt_type type, 171 enum ddt_class class, char *name); 172 extern int ddt_object_walk(ddt_t *ddt, enum ddt_type type, 173 enum ddt_class class, uint64_t *walk, ddt_entry_t *dde); 174 extern uint64_t ddt_object_count(ddt_t *ddt, enum ddt_type type, 175 enum ddt_class class); 176 extern int ddt_object_info(ddt_t *ddt, enum ddt_type type, 177 enum ddt_class class, dmu_object_info_t *); 178 extern boolean_t ddt_object_exists(ddt_t *ddt, enum ddt_type type, 179 enum ddt_class class); 180 181 extern void ddt_bp_fill(const ddt_phys_t *ddp, blkptr_t *bp, 182 uint64_t txg); 183 extern void ddt_bp_create(enum zio_checksum checksum, const ddt_key_t *ddk, 184 const ddt_phys_t *ddp, blkptr_t *bp); 185 186 extern void ddt_key_fill(ddt_key_t *ddk, const blkptr_t *bp); 187 188 extern void ddt_phys_fill(ddt_phys_t *ddp, const blkptr_t *bp); 189 extern void ddt_phys_clear(ddt_phys_t *ddp); 190 extern void ddt_phys_addref(ddt_phys_t *ddp); 191 extern void ddt_phys_decref(ddt_phys_t *ddp); 192 extern void ddt_phys_free(ddt_t *ddt, ddt_key_t *ddk, ddt_phys_t *ddp, 193 uint64_t txg); 194 extern ddt_phys_t *ddt_phys_select(const ddt_entry_t *dde, const blkptr_t *bp); 195 extern uint64_t ddt_phys_total_refcnt(const ddt_entry_t *dde); 196 197 extern void ddt_stat_add(ddt_stat_t *dst, const ddt_stat_t *src, uint64_t neg); 198 199 extern void ddt_histogram_add(ddt_histogram_t *dst, const ddt_histogram_t *src); 200 extern void ddt_histogram_stat(ddt_stat_t *dds, const ddt_histogram_t *ddh); 201 extern boolean_t ddt_histogram_empty(const ddt_histogram_t *ddh); 202 extern void ddt_get_dedup_object_stats(spa_t *spa, ddt_object_t *ddo); 203 extern void ddt_get_dedup_histogram(spa_t *spa, ddt_histogram_t *ddh); 204 extern void ddt_get_dedup_stats(spa_t *spa, ddt_stat_t *dds_total); 205 206 extern uint64_t ddt_get_dedup_dspace(spa_t *spa); 207 extern uint64_t ddt_get_pool_dedup_ratio(spa_t *spa); 208 209 extern int ddt_ditto_copies_needed(ddt_t *ddt, ddt_entry_t *dde, 210 ddt_phys_t *ddp_willref); 211 extern int ddt_ditto_copies_present(ddt_entry_t *dde); 212 213 extern size_t ddt_compress(void *src, uchar_t *dst, size_t s_len, size_t d_len); 214 extern void ddt_decompress(uchar_t *src, void *dst, size_t s_len, size_t d_len); 215 216 extern ddt_t *ddt_select(spa_t *spa, const blkptr_t *bp); 217 extern void ddt_enter(ddt_t *ddt); 218 extern void ddt_exit(ddt_t *ddt); 219 extern ddt_entry_t *ddt_lookup(ddt_t *ddt, const blkptr_t *bp, boolean_t add); 220 extern void ddt_remove(ddt_t *ddt, ddt_entry_t *dde); 221 222 extern boolean_t ddt_class_contains(spa_t *spa, enum ddt_class max_class, 223 const blkptr_t *bp); 224 225 extern ddt_entry_t *ddt_repair_start(ddt_t *ddt, const blkptr_t *bp); 226 extern void ddt_repair_done(ddt_t *ddt, ddt_entry_t *dde); 227 228 extern int ddt_entry_compare(const void *x1, const void *x2); 229 230 extern void ddt_create(spa_t *spa); 231 extern int ddt_load(spa_t *spa); 232 extern void ddt_unload(spa_t *spa); 233 extern void ddt_sync(spa_t *spa, uint64_t txg); 234 extern int ddt_walk(spa_t *spa, ddt_bookmark_t *ddb, ddt_entry_t *dde); 235 236 extern const ddt_ops_t ddt_zap_ops; 237 238 #ifdef __cplusplus 239 } 240 #endif 241 242 #endif /* _SYS_DDT_H */ 243