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zfs-builds-mm/zfs-0.8.1/include/sys/ddt.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) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2016 by Delphix. All rights reserved.
*/
#ifndef _SYS_DDT_H
#define _SYS_DDT_H
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <sys/fs/zfs.h>
#include <sys/zio.h>
#include <sys/dmu.h>
#ifdef __cplusplus
extern "C" {
#endif
struct abd;
/*
* On-disk DDT formats, in the desired search order (newest version first).
*/
enum ddt_type {
DDT_TYPE_ZAP = 0,
DDT_TYPES
};
/*
* DDT classes, in the desired search order (highest replication level first).
*/
enum ddt_class {
DDT_CLASS_DITTO = 0,
DDT_CLASS_DUPLICATE,
DDT_CLASS_UNIQUE,
DDT_CLASSES
};
#define DDT_TYPE_CURRENT 0
#define DDT_COMPRESS_BYTEORDER_MASK 0x80
#define DDT_COMPRESS_FUNCTION_MASK 0x7f
/*
* On-disk ddt entry: key (name) and physical storage (value).
*/
typedef struct ddt_key {
zio_cksum_t ddk_cksum; /* 256-bit block checksum */
/*
* Encoded with logical & physical size, encryption, and compression,
* as follows:
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | 0 | 0 | 0 |X| comp| PSIZE | LSIZE |
* +-------+-------+-------+-------+-------+-------+-------+-------+
*/
uint64_t ddk_prop;
} ddt_key_t;
#define DDK_GET_LSIZE(ddk) \
BF64_GET_SB((ddk)->ddk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1)
#define DDK_SET_LSIZE(ddk, x) \
BF64_SET_SB((ddk)->ddk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1, x)
#define DDK_GET_PSIZE(ddk) \
BF64_GET_SB((ddk)->ddk_prop, 16, 16, SPA_MINBLOCKSHIFT, 1)
#define DDK_SET_PSIZE(ddk, x) \
BF64_SET_SB((ddk)->ddk_prop, 16, 16, SPA_MINBLOCKSHIFT, 1, x)
#define DDK_GET_COMPRESS(ddk) BF64_GET((ddk)->ddk_prop, 32, 7)
#define DDK_SET_COMPRESS(ddk, x) BF64_SET((ddk)->ddk_prop, 32, 7, x)
#define DDK_GET_CRYPT(ddk) BF64_GET((ddk)->ddk_prop, 39, 1)
#define DDK_SET_CRYPT(ddk, x) BF64_SET((ddk)->ddk_prop, 39, 1, x)
#define DDT_KEY_WORDS (sizeof (ddt_key_t) / sizeof (uint64_t))
#define DDE_GET_NDVAS(dde) (DDK_GET_CRYPT(&dde->dde_key) \
? SPA_DVAS_PER_BP - 1 : SPA_DVAS_PER_BP)
typedef struct ddt_phys {
dva_t ddp_dva[SPA_DVAS_PER_BP];
uint64_t ddp_refcnt;
uint64_t ddp_phys_birth;
} ddt_phys_t;
enum ddt_phys_type {
DDT_PHYS_DITTO = 0,
DDT_PHYS_SINGLE = 1,
DDT_PHYS_DOUBLE = 2,
DDT_PHYS_TRIPLE = 3,
DDT_PHYS_TYPES
};
/*
* In-core ddt entry
*/
struct ddt_entry {
ddt_key_t dde_key;
ddt_phys_t dde_phys[DDT_PHYS_TYPES];
zio_t *dde_lead_zio[DDT_PHYS_TYPES];
struct abd *dde_repair_abd;
enum ddt_type dde_type;
enum ddt_class dde_class;
uint8_t dde_loading;
uint8_t dde_loaded;
kcondvar_t dde_cv;
avl_node_t dde_node;
};
/*
* In-core ddt
*/
struct ddt {
kmutex_t ddt_lock;
avl_tree_t ddt_tree;
avl_tree_t ddt_repair_tree;
enum zio_checksum ddt_checksum;
spa_t *ddt_spa;
objset_t *ddt_os;
uint64_t ddt_stat_object;
uint64_t ddt_object[DDT_TYPES][DDT_CLASSES];
ddt_histogram_t ddt_histogram[DDT_TYPES][DDT_CLASSES];
ddt_histogram_t ddt_histogram_cache[DDT_TYPES][DDT_CLASSES];
ddt_object_t ddt_object_stats[DDT_TYPES][DDT_CLASSES];
avl_node_t ddt_node;
};
/*
* In-core and on-disk bookmark for DDT walks
*/
typedef struct ddt_bookmark {
uint64_t ddb_class;
uint64_t ddb_type;
uint64_t ddb_checksum;
uint64_t ddb_cursor;
} ddt_bookmark_t;
/*
* Ops vector to access a specific DDT object type.
*/
typedef struct ddt_ops {
char ddt_op_name[32];
int (*ddt_op_create)(objset_t *os, uint64_t *object, dmu_tx_t *tx,
boolean_t prehash);
int (*ddt_op_destroy)(objset_t *os, uint64_t object, dmu_tx_t *tx);
int (*ddt_op_lookup)(objset_t *os, uint64_t object, ddt_entry_t *dde);
void (*ddt_op_prefetch)(objset_t *os, uint64_t object,
ddt_entry_t *dde);
int (*ddt_op_update)(objset_t *os, uint64_t object, ddt_entry_t *dde,
dmu_tx_t *tx);
int (*ddt_op_remove)(objset_t *os, uint64_t object, ddt_entry_t *dde,
dmu_tx_t *tx);
int (*ddt_op_walk)(objset_t *os, uint64_t object, ddt_entry_t *dde,
uint64_t *walk);
int (*ddt_op_count)(objset_t *os, uint64_t object, uint64_t *count);
} ddt_ops_t;
#define DDT_NAMELEN 80
extern void ddt_object_name(ddt_t *ddt, enum ddt_type type,
enum ddt_class class, char *name);
extern int ddt_object_walk(ddt_t *ddt, enum ddt_type type,
enum ddt_class class, uint64_t *walk, ddt_entry_t *dde);
extern int ddt_object_count(ddt_t *ddt, enum ddt_type type,
enum ddt_class class, uint64_t *count);
extern int ddt_object_info(ddt_t *ddt, enum ddt_type type,
enum ddt_class class, dmu_object_info_t *);
extern boolean_t ddt_object_exists(ddt_t *ddt, enum ddt_type type,
enum ddt_class class);
extern void ddt_bp_fill(const ddt_phys_t *ddp, blkptr_t *bp,
uint64_t txg);
extern void ddt_bp_create(enum zio_checksum checksum, const ddt_key_t *ddk,
const ddt_phys_t *ddp, blkptr_t *bp);
extern void ddt_key_fill(ddt_key_t *ddk, const blkptr_t *bp);
extern void ddt_phys_fill(ddt_phys_t *ddp, const blkptr_t *bp);
extern void ddt_phys_clear(ddt_phys_t *ddp);
extern void ddt_phys_addref(ddt_phys_t *ddp);
extern void ddt_phys_decref(ddt_phys_t *ddp);
extern void ddt_phys_free(ddt_t *ddt, ddt_key_t *ddk, ddt_phys_t *ddp,
uint64_t txg);
extern ddt_phys_t *ddt_phys_select(const ddt_entry_t *dde, const blkptr_t *bp);
extern uint64_t ddt_phys_total_refcnt(const ddt_entry_t *dde);
extern void ddt_stat_add(ddt_stat_t *dst, const ddt_stat_t *src, uint64_t neg);
extern void ddt_histogram_add(ddt_histogram_t *dst, const ddt_histogram_t *src);
extern void ddt_histogram_stat(ddt_stat_t *dds, const ddt_histogram_t *ddh);
extern boolean_t ddt_histogram_empty(const ddt_histogram_t *ddh);
extern void ddt_get_dedup_object_stats(spa_t *spa, ddt_object_t *ddo);
extern void ddt_get_dedup_histogram(spa_t *spa, ddt_histogram_t *ddh);
extern void ddt_get_dedup_stats(spa_t *spa, ddt_stat_t *dds_total);
extern uint64_t ddt_get_dedup_dspace(spa_t *spa);
extern uint64_t ddt_get_pool_dedup_ratio(spa_t *spa);
extern int ddt_ditto_copies_needed(ddt_t *ddt, ddt_entry_t *dde,
ddt_phys_t *ddp_willref);
extern int ddt_ditto_copies_present(ddt_entry_t *dde);
extern size_t ddt_compress(void *src, uchar_t *dst, size_t s_len, size_t d_len);
extern void ddt_decompress(uchar_t *src, void *dst, size_t s_len, size_t d_len);
extern ddt_t *ddt_select(spa_t *spa, const blkptr_t *bp);
extern void ddt_enter(ddt_t *ddt);
extern void ddt_exit(ddt_t *ddt);
extern void ddt_init(void);
extern void ddt_fini(void);
extern ddt_entry_t *ddt_lookup(ddt_t *ddt, const blkptr_t *bp, boolean_t add);
extern void ddt_prefetch(spa_t *spa, const blkptr_t *bp);
extern void ddt_remove(ddt_t *ddt, ddt_entry_t *dde);
extern boolean_t ddt_class_contains(spa_t *spa, enum ddt_class max_class,
const blkptr_t *bp);
extern ddt_entry_t *ddt_repair_start(ddt_t *ddt, const blkptr_t *bp);
extern void ddt_repair_done(ddt_t *ddt, ddt_entry_t *dde);
extern int ddt_entry_compare(const void *x1, const void *x2);
extern void ddt_create(spa_t *spa);
extern int ddt_load(spa_t *spa);
extern void ddt_unload(spa_t *spa);
extern void ddt_sync(spa_t *spa, uint64_t txg);
extern int ddt_walk(spa_t *spa, ddt_bookmark_t *ddb, ddt_entry_t *dde);
extern int ddt_object_update(ddt_t *ddt, enum ddt_type type,
enum ddt_class class, ddt_entry_t *dde, dmu_tx_t *tx);
extern const ddt_ops_t ddt_zap_ops;
#ifdef __cplusplus
}
#endif
#endif /* _SYS_DDT_H */
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