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) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 25 * Copyright (c) 2013, 2016 by Delphix. All rights reserved. 26 * Copyright 2017 Nexenta Systems, Inc. 27 */ 28 29 #ifndef _SYS_ZAP_IMPL_H 30 #define _SYS_ZAP_IMPL_H 31 32 #include <sys/zap.h> 33 #include <sys/zfs_context.h> 34 #include <sys/avl.h> 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 extern int fzap_default_block_shift; 41 42 #define ZAP_MAGIC 0x2F52AB2ABULL 43 44 #define FZAP_BLOCK_SHIFT(zap) ((zap)->zap_f.zap_block_shift) 45 46 #define MZAP_ENT_LEN 64 47 #define MZAP_NAME_LEN (MZAP_ENT_LEN - 8 - 4 - 2) 48 #define MZAP_MAX_BLKSZ SPA_OLD_MAXBLOCKSIZE 49 50 #define ZAP_NEED_CD (-1U) 51 52 typedef struct mzap_ent_phys { 53 uint64_t mze_value; 54 uint32_t mze_cd; 55 uint16_t mze_pad; /* in case we want to chain them someday */ 56 char mze_name[MZAP_NAME_LEN]; 57 } mzap_ent_phys_t; 58 59 typedef struct mzap_phys { 60 uint64_t mz_block_type; /* ZBT_MICRO */ 61 uint64_t mz_salt; 62 uint64_t mz_normflags; 63 uint64_t mz_pad[5]; 64 mzap_ent_phys_t mz_chunk[1]; 65 /* actually variable size depending on block size */ 66 } mzap_phys_t; 67 68 typedef struct mzap_ent { 69 avl_node_t mze_node; 70 int mze_chunkid; 71 uint64_t mze_hash; 72 uint32_t mze_cd; /* copy from mze_phys->mze_cd */ 73 } mzap_ent_t; 74 75 #define MZE_PHYS(zap, mze) \ 76 (&zap_m_phys(zap)->mz_chunk[(mze)->mze_chunkid]) 77 78 /* 79 * The (fat) zap is stored in one object. It is an array of 80 * 1<<FZAP_BLOCK_SHIFT byte blocks. The layout looks like one of: 81 * 82 * ptrtbl fits in first block: 83 * [zap_phys_t zap_ptrtbl_shift < 6] [zap_leaf_t] ... 84 * 85 * ptrtbl too big for first block: 86 * [zap_phys_t zap_ptrtbl_shift >= 6] [zap_leaf_t] [ptrtbl] ... 87 * 88 */ 89 90 struct dmu_buf; 91 struct zap_leaf; 92 93 #define ZBT_LEAF ((1ULL << 63) + 0) 94 #define ZBT_HEADER ((1ULL << 63) + 1) 95 #define ZBT_MICRO ((1ULL << 63) + 3) 96 /* any other values are ptrtbl blocks */ 97 98 /* 99 * the embedded pointer table takes up half a block: 100 * block size / entry size (2^3) / 2 101 */ 102 #define ZAP_EMBEDDED_PTRTBL_SHIFT(zap) (FZAP_BLOCK_SHIFT(zap) - 3 - 1) 103 104 /* 105 * The embedded pointer table starts half-way through the block. Since 106 * the pointer table itself is half the block, it starts at (64-bit) 107 * word number (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)). 108 */ 109 #define ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) \ 110 ((uint64_t *)zap_f_phys(zap)) \ 111 [(idx) + (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap))] 112 113 /* 114 * TAKE NOTE: 115 * If zap_phys_t is modified, zap_byteswap() must be modified. 116 */ 117 typedef struct zap_phys { 118 uint64_t zap_block_type; /* ZBT_HEADER */ 119 uint64_t zap_magic; /* ZAP_MAGIC */ 120 121 struct zap_table_phys { 122 uint64_t zt_blk; /* starting block number */ 123 uint64_t zt_numblks; /* number of blocks */ 124 uint64_t zt_shift; /* bits to index it */ 125 uint64_t zt_nextblk; /* next (larger) copy start block */ 126 uint64_t zt_blks_copied; /* number source blocks copied */ 127 } zap_ptrtbl; 128 129 uint64_t zap_freeblk; /* the next free block */ 130 uint64_t zap_num_leafs; /* number of leafs */ 131 uint64_t zap_num_entries; /* number of entries */ 132 uint64_t zap_salt; /* salt to stir into hash function */ 133 uint64_t zap_normflags; /* flags for u8_textprep_str() */ 134 uint64_t zap_flags; /* zap_flags_t */ 135 /* 136 * This structure is followed by padding, and then the embedded 137 * pointer table. The embedded pointer table takes up second 138 * half of the block. It is accessed using the 139 * ZAP_EMBEDDED_PTRTBL_ENT() macro. 140 */ 141 } zap_phys_t; 142 143 typedef struct zap_table_phys zap_table_phys_t; 144 145 typedef struct zap { 146 dmu_buf_user_t zap_dbu; 147 objset_t *zap_objset; 148 uint64_t zap_object; 149 struct dmu_buf *zap_dbuf; 150 krwlock_t zap_rwlock; 151 boolean_t zap_ismicro; 152 int zap_normflags; 153 uint64_t zap_salt; 154 union { 155 struct { 156 /* 157 * zap_num_entries_mtx protects 158 * zap_num_entries 159 */ 160 kmutex_t zap_num_entries_mtx; 161 int zap_block_shift; 162 } zap_fat; 163 struct { 164 int16_t zap_num_entries; 165 int16_t zap_num_chunks; 166 int16_t zap_alloc_next; 167 avl_tree_t zap_avl; 168 } zap_micro; 169 } zap_u; 170 } zap_t; 171 172 static inline zap_phys_t * 173 zap_f_phys(zap_t *zap) 174 { 175 return (zap->zap_dbuf->db_data); 176 } 177 178 static inline mzap_phys_t * 179 zap_m_phys(zap_t *zap) 180 { 181 return (zap->zap_dbuf->db_data); 182 } 183 184 typedef struct zap_name { 185 zap_t *zn_zap; 186 int zn_key_intlen; 187 const void *zn_key_orig; 188 int zn_key_orig_numints; 189 const void *zn_key_norm; 190 int zn_key_norm_numints; 191 uint64_t zn_hash; 192 matchtype_t zn_matchtype; 193 int zn_normflags; 194 char zn_normbuf[ZAP_MAXNAMELEN]; 195 } zap_name_t; 196 197 #define zap_f zap_u.zap_fat 198 #define zap_m zap_u.zap_micro 199 200 boolean_t zap_match(zap_name_t *zn, const char *matchname); 201 int zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx, 202 krw_t lti, boolean_t fatreader, boolean_t adding, void *tag, zap_t **zapp); 203 void zap_unlockdir(zap_t *zap, void *tag); 204 void zap_evict_sync(void *dbu); 205 zap_name_t *zap_name_alloc(zap_t *zap, const char *key, matchtype_t mt); 206 void zap_name_free(zap_name_t *zn); 207 int zap_hashbits(zap_t *zap); 208 uint32_t zap_maxcd(zap_t *zap); 209 uint64_t zap_getflags(zap_t *zap); 210 211 #define ZAP_HASH_IDX(hash, n) (((n) == 0) ? 0 : ((hash) >> (64 - (n)))) 212 213 void fzap_byteswap(void *buf, size_t size); 214 int fzap_count(zap_t *zap, uint64_t *count); 215 int fzap_lookup(zap_name_t *zn, 216 uint64_t integer_size, uint64_t num_integers, void *buf, 217 char *realname, int rn_len, boolean_t *normalization_conflictp); 218 void fzap_prefetch(zap_name_t *zn); 219 int fzap_add(zap_name_t *zn, uint64_t integer_size, uint64_t num_integers, 220 const void *val, void *tag, dmu_tx_t *tx); 221 int fzap_update(zap_name_t *zn, 222 int integer_size, uint64_t num_integers, const void *val, 223 void *tag, dmu_tx_t *tx); 224 int fzap_length(zap_name_t *zn, 225 uint64_t *integer_size, uint64_t *num_integers); 226 int fzap_remove(zap_name_t *zn, dmu_tx_t *tx); 227 int fzap_cursor_retrieve(zap_t *zap, zap_cursor_t *zc, zap_attribute_t *za); 228 void fzap_get_stats(zap_t *zap, zap_stats_t *zs); 229 void zap_put_leaf(struct zap_leaf *l); 230 231 int fzap_add_cd(zap_name_t *zn, 232 uint64_t integer_size, uint64_t num_integers, 233 const void *val, uint32_t cd, void *tag, dmu_tx_t *tx); 234 void fzap_upgrade(zap_t *zap, dmu_tx_t *tx, zap_flags_t flags); 235 236 #ifdef __cplusplus 237 } 238 #endif 239 240 #endif /* _SYS_ZAP_IMPL_H */ 241