include/sys/zap_impl.h

   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) 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         uint32_t mze_hash;
  70         uint16_t mze_cd; /* copy from mze_phys->mze_cd */
  71         uint16_t mze_chunkid;
  72 } mzap_ent_t;
  73
  74 #define MZE_PHYS(zap, mze) \
  75         (&zap_m_phys(zap)->mz_chunk[(mze)->mze_chunkid])
  76
  77 /*
  78  * The (fat) zap is stored in one object. It is an array of
  79  * 1<<FZAP_BLOCK_SHIFT byte blocks. The layout looks like one of:
  80  *
  81  * ptrtbl fits in first block:
  82  *      [zap_phys_t zap_ptrtbl_shift < 6] [zap_leaf_t] ...
  83  *
  84  * ptrtbl too big for first block:
  85  *      [zap_phys_t zap_ptrtbl_shift >= 6] [zap_leaf_t] [ptrtbl] ...
  86  *
  87  */
  88
  89 struct dmu_buf;
  90 struct zap_leaf;
  91
  92 #define ZBT_LEAF                ((1ULL << 63) + 0)
  93 #define ZBT_HEADER              ((1ULL << 63) + 1)
  94 #define ZBT_MICRO               ((1ULL << 63) + 3)
  95 /* any other values are ptrtbl blocks */
  96
  97 /*
  98  * the embedded pointer table takes up half a block:
  99  * block size / entry size (2^3) / 2
 100  */
 101 #define ZAP_EMBEDDED_PTRTBL_SHIFT(zap) (FZAP_BLOCK_SHIFT(zap) - 3 - 1)
 102
 103 /*
 104  * The embedded pointer table starts half-way through the block.  Since
 105  * the pointer table itself is half the block, it starts at (64-bit)
 106  * word number (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)).
 107  */
 108 #define ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) \
 109         ((uint64_t *)zap_f_phys(zap)) \
 110         [(idx) + (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap))]
 111
 112 /*
 113  * TAKE NOTE:
 114  * If zap_phys_t is modified, zap_byteswap() must be modified.
 115  */
 116 typedef struct zap_phys {
 117         uint64_t zap_block_type;        /* ZBT_HEADER */
 118         uint64_t zap_magic;             /* ZAP_MAGIC */
 119
 120         struct zap_table_phys {
 121                 uint64_t zt_blk;        /* starting block number */
 122                 uint64_t zt_numblks;    /* number of blocks */
 123                 uint64_t zt_shift;      /* bits to index it */
 124                 uint64_t zt_nextblk;    /* next (larger) copy start block */
 125                 uint64_t zt_blks_copied; /* number source blocks copied */
 126         } zap_ptrtbl;
 127
 128         uint64_t zap_freeblk;           /* the next free block */
 129         uint64_t zap_num_leafs;         /* number of leafs */
 130         uint64_t zap_num_entries;       /* number of entries */
 131         uint64_t zap_salt;              /* salt to stir into hash function */
 132         uint64_t zap_normflags;         /* flags for u8_textprep_str() */
 133         uint64_t zap_flags;             /* zap_flags_t */
 134         /*
 135          * This structure is followed by padding, and then the embedded
 136          * pointer table.  The embedded pointer table takes up second
 137          * half of the block.  It is accessed using the
 138          * ZAP_EMBEDDED_PTRTBL_ENT() macro.
 139          */
 140 } zap_phys_t;
 141
 142 typedef struct zap_table_phys zap_table_phys_t;
 143
 144 typedef struct zap {
 145         dmu_buf_user_t zap_dbu;
 146         objset_t *zap_objset;
 147         uint64_t zap_object;
 148         struct dmu_buf *zap_dbuf;
 149         krwlock_t zap_rwlock;
 150         boolean_t zap_ismicro;
 151         int zap_normflags;
 152         uint64_t zap_salt;
 153         union {
 154                 struct {
 155                         /*
 156                          * zap_num_entries_mtx protects
 157                          * zap_num_entries
 158                          */
 159                         kmutex_t zap_num_entries_mtx;
 160                         int zap_block_shift;
 161                 } zap_fat;
 162                 struct {
 163                         int16_t zap_num_entries;
 164                         int16_t zap_num_chunks;
 165                         int16_t zap_alloc_next;
 166                         zfs_btree_t zap_tree;
 167                 } zap_micro;
 168         } zap_u;
 169 } zap_t;
 170
 171 static inline zap_phys_t *
 172 zap_f_phys(zap_t *zap)
 173 {
 174         return (zap->zap_dbuf->db_data);
 175 }
 176
 177 static inline mzap_phys_t *
 178 zap_m_phys(zap_t *zap)
 179 {
 180         return (zap->zap_dbuf->db_data);
 181 }
 182
 183 typedef struct zap_name {
 184         zap_t *zn_zap;
 185         int zn_key_intlen;
 186         const void *zn_key_orig;
 187         int zn_key_orig_numints;
 188         const void *zn_key_norm;
 189         int zn_key_norm_numints;
 190         uint64_t zn_hash;
 191         matchtype_t zn_matchtype;
 192         int zn_normflags;
 193         char zn_normbuf[ZAP_MAXNAMELEN];
 194 } zap_name_t;
 195
 196 #define zap_f   zap_u.zap_fat
 197 #define zap_m   zap_u.zap_micro
 198
 199 boolean_t zap_match(zap_name_t *zn, const char *matchname);
 200 int zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx,
 201     krw_t lti, boolean_t fatreader, boolean_t adding, const void *tag,
 202     zap_t **zapp);
 203 void zap_unlockdir(zap_t *zap, const void *tag);
 204 void zap_evict_sync(void *dbu);
 205 zap_name_t *zap_name_alloc_str(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, const 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     const 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, const 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 */