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Diffstat (limited to 'sys/contrib/opensolaris/uts/common/fs/zfs/sys/zap_impl.h')
| -rw-r--r-- | sys/contrib/opensolaris/uts/common/fs/zfs/sys/zap_impl.h | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/sys/contrib/opensolaris/uts/common/fs/zfs/sys/zap_impl.h b/sys/contrib/opensolaris/uts/common/fs/zfs/sys/zap_impl.h new file mode 100644 index 000000000000..4e43f4ae49a1 --- /dev/null +++ b/sys/contrib/opensolaris/uts/common/fs/zfs/sys/zap_impl.h @@ -0,0 +1,204 @@ +/* + * 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 2006 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#ifndef _SYS_ZAP_IMPL_H +#define _SYS_ZAP_IMPL_H + +#pragma ident "%Z%%M% %I% %E% SMI" + +#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 ZAP_MAXCD (uint32_t)(-1) +#define ZAP_HASHBITS 28 +#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) + +typedef struct mzap_ent_phys { + uint64_t mze_value; + uint32_t mze_cd; + uint16_t mze_pad; /* in case we want to chain them someday */ + char mze_name[MZAP_NAME_LEN]; +} mzap_ent_phys_t; + +typedef struct mzap_phys { + uint64_t mz_block_type; /* ZBT_MICRO */ + uint64_t mz_salt; + uint64_t mz_pad[6]; + mzap_ent_phys_t mz_chunk[1]; + /* actually variable size depending on block size */ +} mzap_phys_t; + +typedef struct mzap_ent { + avl_node_t mze_node; + int mze_chunkid; + uint64_t mze_hash; + mzap_ent_phys_t mze_phys; +} mzap_ent_t; + + +/* + * 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 */ + +/* + * the embedded pointer table takes up half a block: + * block size / entry size (2^3) / 2 + */ +#define ZAP_EMBEDDED_PTRTBL_SHIFT(zap) (FZAP_BLOCK_SHIFT(zap) - 3 - 1) + +/* + * The embedded pointer table starts half-way through the block. Since + * the pointer table itself is half the block, it starts at (64-bit) + * word number (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)). + */ +#define ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) \ + ((uint64_t *)(zap)->zap_f.zap_phys) \ + [(idx) + (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap))] + +/* + * TAKE NOTE: + * If zap_phys_t is modified, zap_byteswap() must be modified. + */ +typedef struct zap_phys { + uint64_t zap_block_type; /* ZBT_HEADER */ + uint64_t zap_magic; /* ZAP_MAGIC */ + + struct zap_table_phys { + uint64_t zt_blk; /* starting block number */ + uint64_t zt_numblks; /* number of blocks */ + uint64_t zt_shift; /* bits to index it */ + uint64_t zt_nextblk; /* next (larger) copy start block */ + uint64_t zt_blks_copied; /* number source blocks copied */ + } zap_ptrtbl; + + uint64_t zap_freeblk; /* the next free block */ + uint64_t zap_num_leafs; /* number of leafs */ + uint64_t zap_num_entries; /* number of entries */ + uint64_t zap_salt; /* salt to stir into hash function */ + /* + * This structure is followed by padding, and then the embedded + * pointer table. The embedded pointer table takes up second + * half of the block. It is accessed using the + * ZAP_EMBEDDED_PTRTBL_ENT() macro. + */ +} 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; + int zap_ismicro; + uint64_t zap_salt; + union { + struct { + zap_phys_t *zap_phys; + + /* + * zap_num_entries_mtx protects + * zap_num_entries + */ + 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; + +#define zap_f zap_u.zap_fat +#define zap_m zap_u.zap_micro + +uint64_t zap_hash(zap_t *zap, const char *name); +int zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx, + krw_t lti, int fatreader, zap_t **zapp); +void zap_unlockdir(zap_t *zap); +void zap_evict(dmu_buf_t *db, void *vmzap); + +#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_t *zap, const char *name, + uint64_t integer_size, uint64_t num_integers, void *buf); +int fzap_add(zap_t *zap, const char *name, + uint64_t integer_size, uint64_t num_integers, + const void *val, dmu_tx_t *tx); +int fzap_update(zap_t *zap, const char *name, + int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx); +int fzap_length(zap_t *zap, const char *name, + uint64_t *integer_size, uint64_t *num_integers); +int fzap_remove(zap_t *zap, const char *name, 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_t *zap, const char *name, + 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); + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_ZAP_IMPL_H */ |