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5720b00632
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Sponsored-by: Klara, Inc. Sponsored-by: iXsystems, Inc. Closes #15887
267 lines
8.5 KiB
C
267 lines
8.5 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2016 by Delphix. All rights reserved.
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* Copyright (c) 2023, Klara Inc.
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*/
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#ifndef _SYS_DDT_H
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#define _SYS_DDT_H
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#include <sys/sysmacros.h>
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#include <sys/types.h>
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#include <sys/fs/zfs.h>
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#include <sys/zio.h>
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#include <sys/dmu.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct abd;
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/*
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* DDT on-disk storage object types. Each one corresponds to specific
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* implementation, see ddt_ops_t. The value itself is not stored on disk.
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*
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* When searching for an entry, objects types will be searched in this order.
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*
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* Note that DDT_TYPES is used as the "no type" for new entries that have not
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* yet been written to a storage object.
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*/
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typedef enum {
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DDT_TYPE_ZAP = 0, /* ZAP storage object, ddt_zap */
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DDT_TYPES
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} ddt_type_t;
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_Static_assert(DDT_TYPES <= UINT8_MAX,
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"ddt_type_t must fit in a uint8_t");
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/* New and updated entries recieve this type, see ddt_sync_entry() */
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#define DDT_TYPE_DEFAULT (DDT_TYPE_ZAP)
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/*
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* DDT storage classes. Each class has a separate storage object for each type.
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* The value itself is not stored on disk.
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*
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* When search for an entry, object classes will be searched in this order.
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*
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* Note that DDT_CLASSES is used as the "no class" for new entries that have not
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* yet been written to a storage object.
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*/
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typedef enum {
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DDT_CLASS_DITTO = 0, /* entry has ditto blocks (obsolete) */
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DDT_CLASS_DUPLICATE, /* entry has multiple references */
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DDT_CLASS_UNIQUE, /* entry has a single reference */
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DDT_CLASSES
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} ddt_class_t;
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_Static_assert(DDT_CLASSES < UINT8_MAX,
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"ddt_class_t must fit in a uint8_t");
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/*
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* The "key" part of an on-disk entry. This is the unique "name" for a block,
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* that is, that parts of the block pointer that will always be the same for
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* the same data.
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*/
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typedef struct {
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zio_cksum_t ddk_cksum; /* 256-bit block checksum */
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/*
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* Encoded with logical & physical size, encryption, and compression,
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* as follows:
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | 0 | 0 | 0 |X| comp| PSIZE | LSIZE |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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*/
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uint64_t ddk_prop;
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} ddt_key_t;
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/*
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* Macros for accessing parts of a ddt_key_t. These are similar to their BP_*
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* counterparts.
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*/
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#define DDK_GET_LSIZE(ddk) \
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BF64_GET_SB((ddk)->ddk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1)
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#define DDK_SET_LSIZE(ddk, x) \
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BF64_SET_SB((ddk)->ddk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1, x)
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#define DDK_GET_PSIZE(ddk) \
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BF64_GET_SB((ddk)->ddk_prop, 16, 16, SPA_MINBLOCKSHIFT, 1)
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#define DDK_SET_PSIZE(ddk, x) \
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BF64_SET_SB((ddk)->ddk_prop, 16, 16, SPA_MINBLOCKSHIFT, 1, x)
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#define DDK_GET_COMPRESS(ddk) BF64_GET((ddk)->ddk_prop, 32, 7)
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#define DDK_SET_COMPRESS(ddk, x) BF64_SET((ddk)->ddk_prop, 32, 7, x)
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#define DDK_GET_CRYPT(ddk) BF64_GET((ddk)->ddk_prop, 39, 1)
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#define DDK_SET_CRYPT(ddk, x) BF64_SET((ddk)->ddk_prop, 39, 1, x)
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/*
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* The "value" part for an on-disk entry. These are the "physical"
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* characteristics of the stored block, such as its location on disk (DVAs),
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* birth txg and ref count.
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*
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* Note that an entry has an array of four ddt_phys_t, one for each number of
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* DVAs (copies= property) and another for additional "ditto" copies. Most
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* users of ddt_phys_t will handle indexing into or counting the phys they
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* want.
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*/
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typedef struct {
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dva_t ddp_dva[SPA_DVAS_PER_BP];
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uint64_t ddp_refcnt;
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uint64_t ddp_phys_birth;
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} ddt_phys_t;
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/*
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* Named indexes into the ddt_phys_t array in each entry.
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*
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* Note, we no longer generate new DDT_PHYS_DITTO-type blocks. However,
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* we maintain the ability to free existing dedup-ditto blocks.
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*/
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enum ddt_phys_type {
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DDT_PHYS_DITTO = 0,
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DDT_PHYS_SINGLE = 1,
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DDT_PHYS_DOUBLE = 2,
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DDT_PHYS_TRIPLE = 3,
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DDT_PHYS_TYPES
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};
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/*
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* A "live" entry, holding changes to an entry made this txg, and other data to
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* support loading, updating and repairing the entry.
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*/
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/* State flags for dde_flags */
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#define DDE_FLAG_LOADED (1 << 0) /* entry ready for use */
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typedef struct {
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/* key must be first for ddt_key_compare */
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ddt_key_t dde_key; /* ddt_tree key */
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ddt_phys_t dde_phys[DDT_PHYS_TYPES]; /* on-disk data */
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/* in-flight update IOs */
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zio_t *dde_lead_zio[DDT_PHYS_TYPES];
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/* copy of data after a repair read, to be rewritten */
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struct abd *dde_repair_abd;
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/* storage type and class the entry was loaded from */
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ddt_type_t dde_type;
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ddt_class_t dde_class;
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uint8_t dde_flags; /* load state flags */
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kcondvar_t dde_cv; /* signaled when load completes */
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avl_node_t dde_node; /* ddt_tree node */
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} ddt_entry_t;
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/*
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* In-core DDT object. This covers all entries and stats for a the whole pool
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* for a given checksum type.
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*/
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typedef struct {
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kmutex_t ddt_lock; /* protects changes to all fields */
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avl_tree_t ddt_tree; /* "live" (changed) entries this txg */
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avl_tree_t ddt_repair_tree; /* entries being repaired */
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enum zio_checksum ddt_checksum; /* checksum algorithm in use */
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spa_t *ddt_spa; /* pool this ddt is on */
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objset_t *ddt_os; /* ddt objset (always MOS) */
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/* per-type/per-class entry store objects */
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uint64_t ddt_object[DDT_TYPES][DDT_CLASSES];
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/* object ids for whole-ddt and per-type/per-class stats */
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uint64_t ddt_stat_object;
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ddt_object_t ddt_object_stats[DDT_TYPES][DDT_CLASSES];
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/* type/class stats by power-2-sized referenced blocks */
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ddt_histogram_t ddt_histogram[DDT_TYPES][DDT_CLASSES];
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ddt_histogram_t ddt_histogram_cache[DDT_TYPES][DDT_CLASSES];
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} ddt_t;
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/*
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* In-core and on-disk bookmark for DDT walks. This is a cursor for ddt_walk(),
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* and is stable across calls, even if the DDT is updated, the pool is
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* restarted or loaded on another system, or OpenZFS is upgraded.
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*/
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typedef struct {
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uint64_t ddb_class;
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uint64_t ddb_type;
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uint64_t ddb_checksum;
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uint64_t ddb_cursor;
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} ddt_bookmark_t;
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extern void ddt_bp_fill(const ddt_phys_t *ddp, blkptr_t *bp,
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uint64_t txg);
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extern void ddt_bp_create(enum zio_checksum checksum, const ddt_key_t *ddk,
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const ddt_phys_t *ddp, blkptr_t *bp);
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extern void ddt_phys_fill(ddt_phys_t *ddp, const blkptr_t *bp);
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extern void ddt_phys_clear(ddt_phys_t *ddp);
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extern void ddt_phys_addref(ddt_phys_t *ddp);
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extern void ddt_phys_decref(ddt_phys_t *ddp);
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extern ddt_phys_t *ddt_phys_select(const ddt_entry_t *dde, const blkptr_t *bp);
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extern void ddt_histogram_add(ddt_histogram_t *dst, const ddt_histogram_t *src);
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extern void ddt_histogram_stat(ddt_stat_t *dds, const ddt_histogram_t *ddh);
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extern boolean_t ddt_histogram_empty(const ddt_histogram_t *ddh);
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extern void ddt_get_dedup_object_stats(spa_t *spa, ddt_object_t *ddo);
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extern void ddt_get_dedup_histogram(spa_t *spa, ddt_histogram_t *ddh);
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extern void ddt_get_dedup_stats(spa_t *spa, ddt_stat_t *dds_total);
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extern uint64_t ddt_get_dedup_dspace(spa_t *spa);
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extern uint64_t ddt_get_pool_dedup_ratio(spa_t *spa);
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extern ddt_t *ddt_select(spa_t *spa, const blkptr_t *bp);
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extern void ddt_enter(ddt_t *ddt);
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extern void ddt_exit(ddt_t *ddt);
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extern void ddt_init(void);
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extern void ddt_fini(void);
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extern ddt_entry_t *ddt_lookup(ddt_t *ddt, const blkptr_t *bp, boolean_t add);
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extern void ddt_prefetch(spa_t *spa, const blkptr_t *bp);
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extern void ddt_remove(ddt_t *ddt, ddt_entry_t *dde);
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extern boolean_t ddt_class_contains(spa_t *spa, ddt_class_t max_class,
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const blkptr_t *bp);
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extern ddt_entry_t *ddt_repair_start(ddt_t *ddt, const blkptr_t *bp);
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extern void ddt_repair_done(ddt_t *ddt, ddt_entry_t *dde);
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extern int ddt_key_compare(const void *x1, const void *x2);
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extern void ddt_create(spa_t *spa);
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extern int ddt_load(spa_t *spa);
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extern void ddt_unload(spa_t *spa);
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extern void ddt_sync(spa_t *spa, uint64_t txg);
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extern int ddt_walk(spa_t *spa, ddt_bookmark_t *ddb, ddt_entry_t *dde);
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extern boolean_t ddt_addref(spa_t *spa, const blkptr_t *bp);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_DDT_H */
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