usr/src/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 (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 */