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