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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 25 #ifndef _SYS_ZAP_IMPL_H 26 #define _SYS_ZAP_IMPL_H 27 28 #include <sys/zap.h> 29 #include <sys/zfs_context.h> 30 #include <sys/avl.h> 31 32 #ifdef __cplusplus 33 extern "C" { 34 #endif 35 36 extern int fzap_default_block_shift; 37 38 #define ZAP_MAGIC 0x2F52AB2ABULL 39 40 #define FZAP_BLOCK_SHIFT(zap) ((zap)->zap_f.zap_block_shift) 41 42 #define MZAP_ENT_LEN 64 43 #define MZAP_NAME_LEN (MZAP_ENT_LEN - 8 - 4 - 2) 44 #define MZAP_MAX_BLKSHIFT SPA_MAXBLOCKSHIFT 45 #define MZAP_MAX_BLKSZ (1 << MZAP_MAX_BLKSHIFT) 46 47 #define ZAP_NEED_CD (-1U) 48 49 typedef struct mzap_ent_phys { 50 uint64_t mze_value; 51 uint32_t mze_cd; 52 uint16_t mze_pad; /* in case we want to chain them someday */ 53 char mze_name[MZAP_NAME_LEN]; 54 } mzap_ent_phys_t; 55 56 typedef struct mzap_phys { 57 uint64_t mz_block_type; /* ZBT_MICRO */ 58 uint64_t mz_salt; 59 uint64_t mz_normflags; 60 uint64_t mz_pad[5]; 61 mzap_ent_phys_t mz_chunk[1]; 62 /* actually variable size depending on block size */ 63 } mzap_phys_t; 64 65 typedef struct mzap_ent { 66 avl_node_t mze_node; 67 int mze_chunkid; 68 uint64_t mze_hash; 69 uint32_t mze_cd; /* copy from mze_phys->mze_cd */ 70 } mzap_ent_t; 71 72 #define MZE_PHYS(zap, mze) \ 73 (&(zap)->zap_m.zap_phys->mz_chunk[(mze)->mze_chunkid]) 74 75 /* 76 * The (fat) zap is stored in one object. It is an array of 77 * 1<<FZAP_BLOCK_SHIFT byte blocks. The layout looks like one of: 78 * 79 * ptrtbl fits in first block: 80 * [zap_phys_t zap_ptrtbl_shift < 6] [zap_leaf_t] ... 81 * 82 * ptrtbl too big for first block: 83 * [zap_phys_t zap_ptrtbl_shift >= 6] [zap_leaf_t] [ptrtbl] ... 84 * 85 */ 86 87 struct dmu_buf; 88 struct zap_leaf; 89 90 #define ZBT_LEAF ((1ULL << 63) + 0) 91 #define ZBT_HEADER ((1ULL << 63) + 1) 92 #define ZBT_MICRO ((1ULL << 63) + 3) 93 /* any other values are ptrtbl blocks */ 94 95 /* 96 * the embedded pointer table takes up half a block: 97 * block size / entry size (2^3) / 2 98 */ 99 #define ZAP_EMBEDDED_PTRTBL_SHIFT(zap) (FZAP_BLOCK_SHIFT(zap) - 3 - 1) 100 101 /* 102 * The embedded pointer table starts half-way through the block. Since 103 * the pointer table itself is half the block, it starts at (64-bit) 104 * word number (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)). 105 */ 106 #define ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) \ 107 ((uint64_t *)(zap)->zap_f.zap_phys) \ 108 [(idx) + (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap))] 109 110 /* 111 * TAKE NOTE: 112 * If zap_phys_t is modified, zap_byteswap() must be modified. 113 */ 114 typedef struct zap_phys { 115 uint64_t zap_block_type; /* ZBT_HEADER */ 116 uint64_t zap_magic; /* ZAP_MAGIC */ 117 118 struct zap_table_phys { 119 uint64_t zt_blk; /* starting block number */ 120 uint64_t zt_numblks; /* number of blocks */ 121 uint64_t zt_shift; /* bits to index it */ 122 uint64_t zt_nextblk; /* next (larger) copy start block */ 123 uint64_t zt_blks_copied; /* number source blocks copied */ 124 } zap_ptrtbl; 125 126 uint64_t zap_freeblk; /* the next free block */ 127 uint64_t zap_num_leafs; /* number of leafs */ 128 uint64_t zap_num_entries; /* number of entries */ 129 uint64_t zap_salt; /* salt to stir into hash function */ 130 uint64_t zap_normflags; /* flags for u8_textprep_str() */ 131 uint64_t zap_flags; /* zap_flags_t */ 132 /* 133 * This structure is followed by padding, and then the embedded 134 * pointer table. The embedded pointer table takes up second 135 * half of the block. It is accessed using the 136 * ZAP_EMBEDDED_PTRTBL_ENT() macro. 137 */ 138 } zap_phys_t; 139 140 typedef struct zap_table_phys zap_table_phys_t; 141 142 typedef struct zap { 143 objset_t *zap_objset; 144 uint64_t zap_object; 145 struct dmu_buf *zap_dbuf; 146 krwlock_t zap_rwlock; 147 boolean_t zap_ismicro; 148 int zap_normflags; 149 uint64_t zap_salt; 150 union { 151 struct { 152 zap_phys_t *zap_phys; 153 154 /* 155 * zap_num_entries_mtx protects 156 * zap_num_entries 157 */ 158 kmutex_t zap_num_entries_mtx; 159 int zap_block_shift; 160 } zap_fat; 161 struct { 162 mzap_phys_t *zap_phys; 163 int16_t zap_num_entries; 164 int16_t zap_num_chunks; 165 int16_t zap_alloc_next; 166 avl_tree_t zap_avl; 167 } zap_micro; 168 } zap_u; 169 } zap_t; 170 171 typedef struct zap_name { 172 zap_t *zn_zap; 173 int zn_key_intlen; 174 const void *zn_key_orig; 175 int zn_key_orig_numints; 176 const void *zn_key_norm; 177 int zn_key_norm_numints; 178 uint64_t zn_hash; 179 matchtype_t zn_matchtype; 180 char zn_normbuf[ZAP_MAXNAMELEN]; 181 } zap_name_t; 182 183 #define zap_f zap_u.zap_fat 184 #define zap_m zap_u.zap_micro 185 186 boolean_t zap_match(zap_name_t *zn, const char *matchname); 187 int zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx, 188 krw_t lti, boolean_t fatreader, boolean_t adding, zap_t **zapp); 189 void zap_unlockdir(zap_t *zap); 190 void zap_evict(dmu_buf_t *db, void *vmzap); 191 zap_name_t *zap_name_alloc(zap_t *zap, const char *key, matchtype_t mt); 192 void zap_name_free(zap_name_t *zn); 193 int zap_hashbits(zap_t *zap); 194 uint32_t zap_maxcd(zap_t *zap); 195 uint64_t zap_getflags(zap_t *zap); 196 197 #define ZAP_HASH_IDX(hash, n) (((n) == 0) ? 0 : ((hash) >> (64 - (n)))) 198 199 void fzap_byteswap(void *buf, size_t size); 200 int fzap_count(zap_t *zap, uint64_t *count); 201 int fzap_lookup(zap_name_t *zn, 202 uint64_t integer_size, uint64_t num_integers, void *buf, 203 char *realname, int rn_len, boolean_t *normalization_conflictp); 204 void fzap_prefetch(zap_name_t *zn); 205 int fzap_count_write(zap_name_t *zn, int add, uint64_t *towrite, 206 uint64_t *tooverwrite); 207 int fzap_add(zap_name_t *zn, uint64_t integer_size, uint64_t num_integers, 208 const void *val, dmu_tx_t *tx); 209 int fzap_update(zap_name_t *zn, 210 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx); 211 int fzap_length(zap_name_t *zn, 212 uint64_t *integer_size, uint64_t *num_integers); 213 int fzap_remove(zap_name_t *zn, dmu_tx_t *tx); 214 int fzap_cursor_retrieve(zap_t *zap, zap_cursor_t *zc, zap_attribute_t *za); 215 void fzap_get_stats(zap_t *zap, zap_stats_t *zs); 216 void zap_put_leaf(struct zap_leaf *l); 217 218 int fzap_add_cd(zap_name_t *zn, 219 uint64_t integer_size, uint64_t num_integers, 220 const void *val, uint32_t cd, dmu_tx_t *tx); 221 void fzap_upgrade(zap_t *zap, dmu_tx_t *tx, zap_flags_t flags); 222 int fzap_cursor_move_to_key(zap_cursor_t *zc, zap_name_t *zn); 223 224 #ifdef __cplusplus 225 } 226 #endif 227 228 #endif /* _SYS_ZAP_IMPL_H */ 229