sys/zap_impl.h

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/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#ifndef _SYS_ZAP_IMPL_H
#define _SYS_ZAP_IMPL_H

#include <sys/zap.h>
#include <sys/zfs_context.h>
#include <sys/avl.h>

#ifdef  __cplusplus
extern "C" {
#endif

extern int fzap_default_block_shift;

#define ZAP_MAGIC 0x2F52AB2ABULL

#define FZAP_BLOCK_SHIFT(zap)   ((zap)->zap_f.zap_block_shift)

#define MZAP_ENT_LEN            64
#define MZAP_NAME_LEN           (MZAP_ENT_LEN - 8 - 4 - 2)
#define MZAP_MAX_BLKSHIFT       SPA_MAXBLOCKSHIFT
#define MZAP_MAX_BLKSZ          (1 << MZAP_MAX_BLKSHIFT)

#define ZAP_NEED_CD             (-1U)

typedef struct mzap_ent_phys {
        uint64_t mze_value;
        uint32_t mze_cd;
        uint16_t mze_pad;       
        char mze_name[MZAP_NAME_LEN];
} mzap_ent_phys_t;

typedef struct mzap_phys {
        uint64_t mz_block_type; 
        uint64_t mz_salt;
        uint64_t mz_normflags;
        uint64_t mz_pad[5];
        mzap_ent_phys_t mz_chunk[1];
} mzap_phys_t;

typedef struct mzap_ent {
        avl_node_t mze_node;
        int mze_chunkid;
        uint64_t mze_hash;
        uint32_t mze_cd; 
} mzap_ent_t;

#define MZE_PHYS(zap, mze) \
        (&(zap)->zap_m.zap_phys->mz_chunk[(mze)->mze_chunkid])

/*
 * The (fat) zap is stored in one object. It is an array of
 * 1<<FZAP_BLOCK_SHIFT byte blocks. The layout looks like one of:
 *
 * ptrtbl fits in first block:
 *      [zap_phys_t zap_ptrtbl_shift < 6] [zap_leaf_t] ...
 *
 * ptrtbl too big for first block:
 *      [zap_phys_t zap_ptrtbl_shift >= 6] [zap_leaf_t] [ptrtbl] ...
 *
 */

struct dmu_buf;
struct zap_leaf;

#define ZBT_LEAF                ((1ULL << 63) + 0)
#define ZBT_HEADER              ((1ULL << 63) + 1)
#define ZBT_MICRO               ((1ULL << 63) + 3)
/* any other values are ptrtbl blocks */

#define ZAP_EMBEDDED_PTRTBL_SHIFT(zap) (FZAP_BLOCK_SHIFT(zap) - 3 - 1)

#define ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) \
        ((uint64_t *)(zap)->zap_f.zap_phys) \
        [(idx) + (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap))]

typedef struct zap_phys {
        uint64_t zap_block_type;        
        uint64_t zap_magic;             
        struct zap_table_phys {
                uint64_t zt_blk;        
                uint64_t zt_numblks;    
                uint64_t zt_shift;      
                uint64_t zt_nextblk;    
                uint64_t zt_blks_copied; 
        } zap_ptrtbl;

        uint64_t zap_freeblk;           
        uint64_t zap_num_leafs;         
        uint64_t zap_num_entries;       
        uint64_t zap_salt;              
        uint64_t zap_normflags;         
        uint64_t zap_flags;             
} zap_phys_t;

typedef struct zap_table_phys zap_table_phys_t;

typedef struct zap {
        objset_t *zap_objset;
        uint64_t zap_object;
        struct dmu_buf *zap_dbuf;
        krwlock_t zap_rwlock;
        boolean_t zap_ismicro;
        int zap_normflags;
        uint64_t zap_salt;
        union {
                struct {
                        zap_phys_t *zap_phys;

                        kmutex_t zap_num_entries_mtx;
                        int zap_block_shift;
                } zap_fat;
                struct {
                        mzap_phys_t *zap_phys;
                        int16_t zap_num_entries;
                        int16_t zap_num_chunks;
                        int16_t zap_alloc_next;
                        avl_tree_t zap_avl;
                } zap_micro;
        } zap_u;
} zap_t;

typedef struct zap_name {
        zap_t *zn_zap;
        int zn_key_intlen;
        const void *zn_key_orig;
        int zn_key_orig_numints;
        const void *zn_key_norm;
        int zn_key_norm_numints;
        uint64_t zn_hash;
        matchtype_t zn_matchtype;
        char zn_normbuf[ZAP_MAXNAMELEN];
} zap_name_t;

#define zap_f   zap_u.zap_fat
#define zap_m   zap_u.zap_micro

boolean_t zap_match(zap_name_t *zn, const char *matchname);
int zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx,
    krw_t lti, boolean_t fatreader, boolean_t adding, zap_t **zapp);
void zap_unlockdir(zap_t *zap);
void zap_evict(dmu_buf_t *db, void *vmzap);
zap_name_t *zap_name_alloc(zap_t *zap, const char *key, matchtype_t mt);
void zap_name_free(zap_name_t *zn);
int zap_hashbits(zap_t *zap);
uint32_t zap_maxcd(zap_t *zap);
uint64_t zap_getflags(zap_t *zap);

#define ZAP_HASH_IDX(hash, n) (((n) == 0) ? 0 : ((hash) >> (64 - (n))))

void fzap_byteswap(void *buf, size_t size);
int fzap_count(zap_t *zap, uint64_t *count);
int fzap_lookup(zap_name_t *zn,
    uint64_t integer_size, uint64_t num_integers, void *buf,
    char *realname, int rn_len, boolean_t *normalization_conflictp);
void fzap_prefetch(zap_name_t *zn);
int fzap_count_write(zap_name_t *zn, int add, uint64_t *towrite,
    uint64_t *tooverwrite);
int fzap_add(zap_name_t *zn, uint64_t integer_size, uint64_t num_integers,
    const void *val, dmu_tx_t *tx);
int fzap_update(zap_name_t *zn,
    int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx);
int fzap_length(zap_name_t *zn,
    uint64_t *integer_size, uint64_t *num_integers);
int fzap_remove(zap_name_t *zn, dmu_tx_t *tx);
int fzap_cursor_retrieve(zap_t *zap, zap_cursor_t *zc, zap_attribute_t *za);
void fzap_get_stats(zap_t *zap, zap_stats_t *zs);
void zap_put_leaf(struct zap_leaf *l);

int fzap_add_cd(zap_name_t *zn,
    uint64_t integer_size, uint64_t num_integers,
    const void *val, uint32_t cd, dmu_tx_t *tx);
void fzap_upgrade(zap_t *zap, dmu_tx_t *tx, zap_flags_t flags);
int fzap_cursor_move_to_key(zap_cursor_t *zc, zap_name_t *zn);

#ifdef  __cplusplus
}
#endif

#endif /* _SYS_ZAP_IMPL_H */