external/cddl/osnet/dist/uts/common/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  * Copyright 2007 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 #pragma ident   "%Z%%M% %I%     %E% SMI"
  30
  31 #include <sys/zap.h>
  32 #include <sys/zfs_context.h>
  33 #include <sys/avl.h>
  34
  35 #ifdef  __cplusplus
  36 extern "C" {
  37 #endif
  38
  39 extern int fzap_default_block_shift;
  40
  41 #define ZAP_MAGIC 0x2F52AB2ABULL
  42
  43 #define FZAP_BLOCK_SHIFT(zap)   ((zap)->zap_f.zap_block_shift)
  44
  45 #define ZAP_MAXCD               (uint32_t)(-1)
  46 #define ZAP_HASHBITS            28
  47 #define MZAP_ENT_LEN            64
  48 #define MZAP_NAME_LEN           (MZAP_ENT_LEN - 8 - 4 - 2)
  49 #define MZAP_MAX_BLKSHIFT       SPA_MAXBLOCKSHIFT
  50 #define MZAP_MAX_BLKSZ          (1 << MZAP_MAX_BLKSHIFT)
  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         mzap_ent_phys_t mze_phys;
  73 } mzap_ent_t;
  74
  75
  76 /*
  77  * The (fat) zap is stored in one object. It is an array of
  78  * 1<<FZAP_BLOCK_SHIFT byte blocks. The layout looks like one of:
  79  *
  80  * ptrtbl fits in first block:
  81  *      [zap_phys_t zap_ptrtbl_shift < 6] [zap_leaf_t] ...
  82  *
  83  * ptrtbl too big for first block:
  84  *      [zap_phys_t zap_ptrtbl_shift >= 6] [zap_leaf_t] [ptrtbl] ...
  85  *
  86  */
  87
  88 struct dmu_buf;
  89 struct zap_leaf;
  90
  91 #define ZBT_LEAF                ((1ULL << 63) + 0)
  92 #define ZBT_HEADER              ((1ULL << 63) + 1)
  93 #define ZBT_MICRO               ((1ULL << 63) + 3)
  94 /* any other values are ptrtbl blocks */
  95
  96 /*
  97  * the embedded pointer table takes up half a block:
  98  * block size / entry size (2^3) / 2
  99  */
 100 #define ZAP_EMBEDDED_PTRTBL_SHIFT(zap) (FZAP_BLOCK_SHIFT(zap) - 3 - 1)
 101
 102 /*
 103  * The embedded pointer table starts half-way through the block.  Since
 104  * the pointer table itself is half the block, it starts at (64-bit)
 105  * word number (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)).
 106  */
 107 #define ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) \
 108         ((uint64_t *)(zap)->zap_f.zap_phys) \
 109         [(idx) + (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap))]
 110
 111 /*
 112  * TAKE NOTE:
 113  * If zap_phys_t is modified, zap_byteswap() must be modified.
 114  */
 115 typedef struct zap_phys {
 116         uint64_t zap_block_type;        /* ZBT_HEADER */
 117         uint64_t zap_magic;             /* ZAP_MAGIC */
 118
 119         struct zap_table_phys {
 120                 uint64_t zt_blk;        /* starting block number */
 121                 uint64_t zt_numblks;    /* number of blocks */
 122                 uint64_t zt_shift;      /* bits to index it */
 123                 uint64_t zt_nextblk;    /* next (larger) copy start block */
 124                 uint64_t zt_blks_copied; /* number source blocks copied */
 125         } zap_ptrtbl;
 126
 127         uint64_t zap_freeblk;           /* the next free block */
 128         uint64_t zap_num_leafs;         /* number of leafs */
 129         uint64_t zap_num_entries;       /* number of entries */
 130         uint64_t zap_salt;              /* salt to stir into hash function */
 131         uint64_t zap_normflags;         /* flags for u8_textprep_str() */
 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         const char *zn_name_orij;
 174         uint64_t zn_hash;
 175         matchtype_t zn_matchtype;
 176         const char *zn_name_norm;
 177         char zn_normbuf[ZAP_MAXNAMELEN];
 178 } zap_name_t;
 179
 180 #define zap_f   zap_u.zap_fat
 181 #define zap_m   zap_u.zap_micro
 182
 183 boolean_t zap_match(zap_name_t *zn, const char *matchname);
 184 int zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx,
 185     krw_t lti, boolean_t fatreader, boolean_t adding, zap_t **zapp);
 186 void zap_unlockdir(zap_t *zap);
 187 void zap_evict(dmu_buf_t *db, void *vmzap);
 188 zap_name_t *zap_name_alloc(zap_t *zap, const char *name, matchtype_t mt);
 189 void zap_name_free(zap_name_t *zn);
 190
 191 #define ZAP_HASH_IDX(hash, n) (((n) == 0) ? 0 : ((hash) >> (64 - (n))))
 192
 193 void fzap_byteswap(void *buf, size_t size);
 194 int fzap_count(zap_t *zap, uint64_t *count);
 195 int fzap_lookup(zap_name_t *zn,
 196     uint64_t integer_size, uint64_t num_integers, void *buf,
 197     char *realname, int rn_len, boolean_t *normalization_conflictp);
 198 int fzap_add(zap_name_t *zn, uint64_t integer_size, uint64_t num_integers,
 199     const void *val, dmu_tx_t *tx);
 200 int fzap_update(zap_name_t *zn,
 201     int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx);
 202 int fzap_length(zap_name_t *zn,
 203     uint64_t *integer_size, uint64_t *num_integers);
 204 int fzap_remove(zap_name_t *zn, dmu_tx_t *tx);
 205 int fzap_cursor_retrieve(zap_t *zap, zap_cursor_t *zc, zap_attribute_t *za);
 206 void fzap_get_stats(zap_t *zap, zap_stats_t *zs);
 207 void zap_put_leaf(struct zap_leaf *l);
 208
 209 int fzap_add_cd(zap_name_t *zn,
 210     uint64_t integer_size, uint64_t num_integers,
 211     const void *val, uint32_t cd, dmu_tx_t *tx);
 212 void fzap_upgrade(zap_t *zap, dmu_tx_t *tx);
 213
 214 #ifdef  __cplusplus
 215 }
 216 #endif
 217
 218 #endif /* _SYS_ZAP_IMPL_H */