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 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SYS_ZAP_IMPL_H 27 #define _SYS_ZAP_IMPL_H 28 29 #include <sys/zap.h> 30 #include <sys/zfs_context.h> 31 #include <sys/avl.h> 32 33 #ifdef __cplusplus 34 extern "C" { 35 #endif 36 37 extern int fzap_default_block_shift; 38 39 #define ZAP_MAGIC 0x2F52AB2ABULL 40 41 #define FZAP_BLOCK_SHIFT(zap) ((zap)->zap_f.zap_block_shift) 42 43 #define MZAP_ENT_LEN 64 44 #define MZAP_NAME_LEN (MZAP_ENT_LEN - 8 - 4 - 2) 45 #define MZAP_MAX_BLKSHIFT SPA_MAXBLOCKSHIFT 46 #define MZAP_MAX_BLKSZ (1 << MZAP_MAX_BLKSHIFT) 47 48 #define ZAP_NEED_CD (-1U) 49 50 typedef struct mzap_ent_phys { 51 uint64_t mze_value; 52 uint32_t mze_cd; 53 uint16_t mze_pad; /* in case we want to chain them someday */ 54 char mze_name[MZAP_NAME_LEN]; 55 } mzap_ent_phys_t; 56 57 typedef struct mzap_phys { 58 uint64_t mz_block_type; /* ZBT_MICRO */ 59 uint64_t mz_salt; 60 uint64_t mz_normflags; 61 uint64_t mz_pad[5]; 62 mzap_ent_phys_t mz_chunk[1]; 63 /* actually variable size depending on block size */ 64 } mzap_phys_t; 65 66 typedef struct mzap_ent { 67 avl_node_t mze_node; 68 int mze_chunkid; 69 uint64_t mze_hash; 70 mzap_ent_phys_t mze_phys; 71 } mzap_ent_t; 72 73 /* 74 * The (fat) zap is stored in one object. It is an array of 75 * 1<<FZAP_BLOCK_SHIFT byte blocks. The layout looks like one of: 76 * 77 * ptrtbl fits in first block: 78 * [zap_phys_t zap_ptrtbl_shift < 6] [zap_leaf_t] ... 79 * 80 * ptrtbl too big for first block: 81 * [zap_phys_t zap_ptrtbl_shift >= 6] [zap_leaf_t] [ptrtbl] ... 82 * 83 */ 84 85 struct dmu_buf; 86 struct zap_leaf; 87 88 #define ZBT_LEAF ((1ULL << 63) + 0) 89 #define ZBT_HEADER ((1ULL << 63) + 1) 90 #define ZBT_MICRO ((1ULL << 63) + 3) 91 /* any other values are ptrtbl blocks */ 92 93 /* 94 * the embedded pointer table takes up half a block: 95 * block size / entry size (2^3) / 2 96 */ 97 #define ZAP_EMBEDDED_PTRTBL_SHIFT(zap) (FZAP_BLOCK_SHIFT(zap) - 3 - 1) 98 99 /* 100 * The embedded pointer table starts half-way through the block. Since 101 * the pointer table itself is half the block, it starts at (64-bit) 102 * word number (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)). 103 */ 104 #define ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) \ 105 ((uint64_t *)(zap)->zap_f.zap_phys) \ 106 [(idx) + (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap))] 107 108 /* 109 * TAKE NOTE: 110 * If zap_phys_t is modified, zap_byteswap() must be modified. 111 */ 112 typedef struct zap_phys { 113 uint64_t zap_block_type; /* ZBT_HEADER */ 114 uint64_t zap_magic; /* ZAP_MAGIC */ 115 116 struct zap_table_phys { 117 uint64_t zt_blk; /* starting block number */ 118 uint64_t zt_numblks; /* number of blocks */ 119 uint64_t zt_shift; /* bits to index it */ 120 uint64_t zt_nextblk; /* next (larger) copy start block */ 121 uint64_t zt_blks_copied; /* number source blocks copied */ 122 } zap_ptrtbl; 123 124 uint64_t zap_freeblk; /* the next free block */ 125 uint64_t zap_num_leafs; /* number of leafs */ 126 uint64_t zap_num_entries; /* number of entries */ 127 uint64_t zap_salt; /* salt to stir into hash function */ 128 uint64_t zap_normflags; /* flags for u8_textprep_str() */ 129 uint64_t zap_flags; /* zap_flags_t */ 130 /* 131 * This structure is followed by padding, and then the embedded 132 * pointer table. The embedded pointer table takes up second 133 * half of the block. It is accessed using the 134 * ZAP_EMBEDDED_PTRTBL_ENT() macro. 135 */ 136 } zap_phys_t; 137 138 typedef struct zap_table_phys zap_table_phys_t; 139 140 typedef struct zap { 141 objset_t *zap_objset; 142 uint64_t zap_object; 143 struct dmu_buf *zap_dbuf; 144 krwlock_t zap_rwlock; 145 boolean_t zap_ismicro; 146 int zap_normflags; 147 uint64_t zap_salt; 148 union { 149 struct { 150 zap_phys_t *zap_phys; 151 152 /* 153 * zap_num_entries_mtx protects 154 * zap_num_entries 155 */ 156 kmutex_t zap_num_entries_mtx; 157 int zap_block_shift; 158 } zap_fat; 159 struct { 160 mzap_phys_t *zap_phys; 161 int16_t zap_num_entries; 162 int16_t zap_num_chunks; 163 int16_t zap_alloc_next; 164 avl_tree_t zap_avl; 165 } zap_micro; 166 } zap_u; 167 } zap_t; 168 169 typedef struct zap_name { 170 zap_t *zn_zap; 171 int zn_key_intlen; 172 const void *zn_key_orig; 173 int zn_key_orig_len; 174 const void *zn_key_norm; 175 int zn_key_norm_len; 176 uint64_t zn_hash; 177 matchtype_t zn_matchtype; 178 char zn_normbuf[ZAP_MAXNAMELEN]; 179 } zap_name_t; 180 181 #define zap_f zap_u.zap_fat 182 #define zap_m zap_u.zap_micro 183 184 boolean_t zap_match(zap_name_t *zn, const char *matchname); 185 int zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx, 186 krw_t lti, boolean_t fatreader, boolean_t adding, zap_t **zapp); 187 void zap_unlockdir(zap_t *zap); 188 void zap_evict(dmu_buf_t *db, void *vmzap); 189 zap_name_t *zap_name_alloc(zap_t *zap, const char *key, matchtype_t mt); 190 void zap_name_free(zap_name_t *zn); 191 int zap_hashbits(zap_t *zap); 192 uint32_t zap_maxcd(zap_t *zap); 193 uint64_t zap_getflags(zap_t *zap); 194 195 #define ZAP_HASH_IDX(hash, n) (((n) == 0) ? 0 : ((hash) >> (64 - (n)))) 196 197 void fzap_byteswap(void *buf, size_t size); 198 int fzap_count(zap_t *zap, uint64_t *count); 199 int fzap_lookup(zap_name_t *zn, 200 uint64_t integer_size, uint64_t num_integers, void *buf, 201 char *realname, int rn_len, boolean_t *normalization_conflictp); 202 int fzap_count_write(zap_name_t *zn, int add, uint64_t *towrite, 203 uint64_t *tooverwrite); 204 int fzap_add(zap_name_t *zn, uint64_t integer_size, uint64_t num_integers, 205 const void *val, dmu_tx_t *tx); 206 int fzap_update(zap_name_t *zn, 207 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx); 208 int fzap_length(zap_name_t *zn, 209 uint64_t *integer_size, uint64_t *num_integers); 210 int fzap_remove(zap_name_t *zn, dmu_tx_t *tx); 211 int fzap_cursor_retrieve(zap_t *zap, zap_cursor_t *zc, zap_attribute_t *za); 212 void fzap_get_stats(zap_t *zap, zap_stats_t *zs); 213 void zap_put_leaf(struct zap_leaf *l); 214 215 int fzap_add_cd(zap_name_t *zn, 216 uint64_t integer_size, uint64_t num_integers, 217 const void *val, uint32_t cd, dmu_tx_t *tx); 218 void fzap_upgrade(zap_t *zap, dmu_tx_t *tx, zap_flags_t flags); 219 int fzap_cursor_move_to_key(zap_cursor_t *zc, zap_name_t *zn); 220 221 #ifdef __cplusplus 222 } 223 #endif 224 225 #endif /* _SYS_ZAP_IMPL_H */ 226