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.
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.
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]
23 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
27 #include <sys/zfs_context.h>
29 #include <sys/spa_impl.h>
33 #include <sys/dmu_tx.h>
35 #include <sys/dsl_pool.h>
36 #include <sys/zio_checksum.h>
37 #include <sys/zio_compress.h>
38 #include <sys/dsl_scan.h>
40 static kmem_cache_t
*ddt_cache
;
41 static kmem_cache_t
*ddt_entry_cache
;
44 * Enable/disable prefetching of dedup-ed blocks which are going to be freed.
46 int zfs_dedup_prefetch
= 0;
48 static const ddt_ops_t
*ddt_ops
[DDT_TYPES
] = {
52 static const char *ddt_class_name
[DDT_CLASSES
] = {
59 ddt_object_create(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
62 spa_t
*spa
= ddt
->ddt_spa
;
63 objset_t
*os
= ddt
->ddt_os
;
64 uint64_t *objectp
= &ddt
->ddt_object
[type
][class];
65 boolean_t prehash
= zio_checksum_table
[ddt
->ddt_checksum
].ci_dedup
;
66 char name
[DDT_NAMELEN
];
68 ddt_object_name(ddt
, type
, class, name
);
70 ASSERT(*objectp
== 0);
71 VERIFY(ddt_ops
[type
]->ddt_op_create(os
, objectp
, tx
, prehash
) == 0);
72 ASSERT(*objectp
!= 0);
74 VERIFY(zap_add(os
, DMU_POOL_DIRECTORY_OBJECT
, name
,
75 sizeof (uint64_t), 1, objectp
, tx
) == 0);
77 VERIFY(zap_add(os
, spa
->spa_ddt_stat_object
, name
,
78 sizeof (uint64_t), sizeof (ddt_histogram_t
) / sizeof (uint64_t),
79 &ddt
->ddt_histogram
[type
][class], tx
) == 0);
83 ddt_object_destroy(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
86 spa_t
*spa
= ddt
->ddt_spa
;
87 objset_t
*os
= ddt
->ddt_os
;
88 uint64_t *objectp
= &ddt
->ddt_object
[type
][class];
90 char name
[DDT_NAMELEN
];
92 ddt_object_name(ddt
, type
, class, name
);
94 ASSERT(*objectp
!= 0);
95 ASSERT(ddt_histogram_empty(&ddt
->ddt_histogram
[type
][class]));
96 VERIFY(ddt_object_count(ddt
, type
, class, &count
) == 0 && count
== 0);
97 VERIFY(zap_remove(os
, DMU_POOL_DIRECTORY_OBJECT
, name
, tx
) == 0);
98 VERIFY(zap_remove(os
, spa
->spa_ddt_stat_object
, name
, tx
) == 0);
99 VERIFY(ddt_ops
[type
]->ddt_op_destroy(os
, *objectp
, tx
) == 0);
100 bzero(&ddt
->ddt_object_stats
[type
][class], sizeof (ddt_object_t
));
106 ddt_object_load(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class)
108 ddt_object_t
*ddo
= &ddt
->ddt_object_stats
[type
][class];
109 dmu_object_info_t doi
;
111 char name
[DDT_NAMELEN
];
114 ddt_object_name(ddt
, type
, class, name
);
116 error
= zap_lookup(ddt
->ddt_os
, DMU_POOL_DIRECTORY_OBJECT
, name
,
117 sizeof (uint64_t), 1, &ddt
->ddt_object
[type
][class]);
122 VERIFY0(zap_lookup(ddt
->ddt_os
, ddt
->ddt_spa
->spa_ddt_stat_object
, name
,
123 sizeof (uint64_t), sizeof (ddt_histogram_t
) / sizeof (uint64_t),
124 &ddt
->ddt_histogram
[type
][class]));
127 * Seed the cached statistics.
129 error
= ddt_object_info(ddt
, type
, class, &doi
);
133 error
= ddt_object_count(ddt
, type
, class, &count
);
137 ddo
->ddo_count
= count
;
138 ddo
->ddo_dspace
= doi
.doi_physical_blocks_512
<< 9;
139 ddo
->ddo_mspace
= doi
.doi_fill_count
* doi
.doi_data_block_size
;
145 ddt_object_sync(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
148 ddt_object_t
*ddo
= &ddt
->ddt_object_stats
[type
][class];
149 dmu_object_info_t doi
;
151 char name
[DDT_NAMELEN
];
153 ddt_object_name(ddt
, type
, class, name
);
155 VERIFY(zap_update(ddt
->ddt_os
, ddt
->ddt_spa
->spa_ddt_stat_object
, name
,
156 sizeof (uint64_t), sizeof (ddt_histogram_t
) / sizeof (uint64_t),
157 &ddt
->ddt_histogram
[type
][class], tx
) == 0);
160 * Cache DDT statistics; this is the only time they'll change.
162 VERIFY(ddt_object_info(ddt
, type
, class, &doi
) == 0);
163 VERIFY(ddt_object_count(ddt
, type
, class, &count
) == 0);
165 ddo
->ddo_count
= count
;
166 ddo
->ddo_dspace
= doi
.doi_physical_blocks_512
<< 9;
167 ddo
->ddo_mspace
= doi
.doi_fill_count
* doi
.doi_data_block_size
;
171 ddt_object_lookup(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
174 if (!ddt_object_exists(ddt
, type
, class))
175 return (SET_ERROR(ENOENT
));
177 return (ddt_ops
[type
]->ddt_op_lookup(ddt
->ddt_os
,
178 ddt
->ddt_object
[type
][class], dde
));
182 ddt_object_prefetch(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
185 if (!ddt_object_exists(ddt
, type
, class))
188 ddt_ops
[type
]->ddt_op_prefetch(ddt
->ddt_os
,
189 ddt
->ddt_object
[type
][class], dde
);
193 ddt_object_update(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
194 ddt_entry_t
*dde
, dmu_tx_t
*tx
)
196 ASSERT(ddt_object_exists(ddt
, type
, class));
198 return (ddt_ops
[type
]->ddt_op_update(ddt
->ddt_os
,
199 ddt
->ddt_object
[type
][class], dde
, tx
));
203 ddt_object_remove(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
204 ddt_entry_t
*dde
, dmu_tx_t
*tx
)
206 ASSERT(ddt_object_exists(ddt
, type
, class));
208 return (ddt_ops
[type
]->ddt_op_remove(ddt
->ddt_os
,
209 ddt
->ddt_object
[type
][class], dde
, tx
));
213 ddt_object_walk(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
214 uint64_t *walk
, ddt_entry_t
*dde
)
216 ASSERT(ddt_object_exists(ddt
, type
, class));
218 return (ddt_ops
[type
]->ddt_op_walk(ddt
->ddt_os
,
219 ddt
->ddt_object
[type
][class], dde
, walk
));
223 ddt_object_count(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
226 ASSERT(ddt_object_exists(ddt
, type
, class));
228 return (ddt_ops
[type
]->ddt_op_count(ddt
->ddt_os
,
229 ddt
->ddt_object
[type
][class], count
));
233 ddt_object_info(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
234 dmu_object_info_t
*doi
)
236 if (!ddt_object_exists(ddt
, type
, class))
237 return (SET_ERROR(ENOENT
));
239 return (dmu_object_info(ddt
->ddt_os
, ddt
->ddt_object
[type
][class],
244 ddt_object_exists(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class)
246 return (!!ddt
->ddt_object
[type
][class]);
250 ddt_object_name(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
253 (void) sprintf(name
, DMU_POOL_DDT
,
254 zio_checksum_table
[ddt
->ddt_checksum
].ci_name
,
255 ddt_ops
[type
]->ddt_op_name
, ddt_class_name
[class]);
259 ddt_bp_fill(const ddt_phys_t
*ddp
, blkptr_t
*bp
, uint64_t txg
)
264 for (d
= 0; d
< SPA_DVAS_PER_BP
; d
++)
265 bp
->blk_dva
[d
] = ddp
->ddp_dva
[d
];
266 BP_SET_BIRTH(bp
, txg
, ddp
->ddp_phys_birth
);
270 ddt_bp_create(enum zio_checksum checksum
,
271 const ddt_key_t
*ddk
, const ddt_phys_t
*ddp
, blkptr_t
*bp
)
276 ddt_bp_fill(ddp
, bp
, ddp
->ddp_phys_birth
);
278 bp
->blk_cksum
= ddk
->ddk_cksum
;
281 BP_SET_LSIZE(bp
, DDK_GET_LSIZE(ddk
));
282 BP_SET_PSIZE(bp
, DDK_GET_PSIZE(ddk
));
283 BP_SET_COMPRESS(bp
, DDK_GET_COMPRESS(ddk
));
284 BP_SET_CHECKSUM(bp
, checksum
);
285 BP_SET_TYPE(bp
, DMU_OT_DEDUP
);
288 BP_SET_BYTEORDER(bp
, ZFS_HOST_BYTEORDER
);
292 ddt_key_fill(ddt_key_t
*ddk
, const blkptr_t
*bp
)
294 ddk
->ddk_cksum
= bp
->blk_cksum
;
297 DDK_SET_LSIZE(ddk
, BP_GET_LSIZE(bp
));
298 DDK_SET_PSIZE(ddk
, BP_GET_PSIZE(bp
));
299 DDK_SET_COMPRESS(ddk
, BP_GET_COMPRESS(bp
));
303 ddt_phys_fill(ddt_phys_t
*ddp
, const blkptr_t
*bp
)
306 ASSERT(ddp
->ddp_phys_birth
== 0);
308 for (d
= 0; d
< SPA_DVAS_PER_BP
; d
++)
309 ddp
->ddp_dva
[d
] = bp
->blk_dva
[d
];
310 ddp
->ddp_phys_birth
= BP_PHYSICAL_BIRTH(bp
);
314 ddt_phys_clear(ddt_phys_t
*ddp
)
316 bzero(ddp
, sizeof (*ddp
));
320 ddt_phys_addref(ddt_phys_t
*ddp
)
326 ddt_phys_decref(ddt_phys_t
*ddp
)
329 ASSERT(ddp
->ddp_refcnt
> 0);
335 ddt_phys_free(ddt_t
*ddt
, ddt_key_t
*ddk
, ddt_phys_t
*ddp
, uint64_t txg
)
339 ddt_bp_create(ddt
->ddt_checksum
, ddk
, ddp
, &blk
);
341 zio_free(ddt
->ddt_spa
, txg
, &blk
);
345 ddt_phys_select(const ddt_entry_t
*dde
, const blkptr_t
*bp
)
347 ddt_phys_t
*ddp
= (ddt_phys_t
*)dde
->dde_phys
;
350 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++) {
351 if (DVA_EQUAL(BP_IDENTITY(bp
), &ddp
->ddp_dva
[0]) &&
352 BP_PHYSICAL_BIRTH(bp
) == ddp
->ddp_phys_birth
)
359 ddt_phys_total_refcnt(const ddt_entry_t
*dde
)
364 for (p
= DDT_PHYS_SINGLE
; p
<= DDT_PHYS_TRIPLE
; p
++)
365 refcnt
+= dde
->dde_phys
[p
].ddp_refcnt
;
371 ddt_stat_generate(ddt_t
*ddt
, ddt_entry_t
*dde
, ddt_stat_t
*dds
)
373 spa_t
*spa
= ddt
->ddt_spa
;
374 ddt_phys_t
*ddp
= dde
->dde_phys
;
375 ddt_key_t
*ddk
= &dde
->dde_key
;
376 uint64_t lsize
= DDK_GET_LSIZE(ddk
);
377 uint64_t psize
= DDK_GET_PSIZE(ddk
);
380 bzero(dds
, sizeof (*dds
));
382 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++) {
384 uint64_t refcnt
= ddp
->ddp_refcnt
;
386 if (ddp
->ddp_phys_birth
== 0)
389 for (d
= 0; d
< SPA_DVAS_PER_BP
; d
++)
390 dsize
+= dva_get_dsize_sync(spa
, &ddp
->ddp_dva
[d
]);
392 dds
->dds_blocks
+= 1;
393 dds
->dds_lsize
+= lsize
;
394 dds
->dds_psize
+= psize
;
395 dds
->dds_dsize
+= dsize
;
397 dds
->dds_ref_blocks
+= refcnt
;
398 dds
->dds_ref_lsize
+= lsize
* refcnt
;
399 dds
->dds_ref_psize
+= psize
* refcnt
;
400 dds
->dds_ref_dsize
+= dsize
* refcnt
;
405 ddt_stat_add(ddt_stat_t
*dst
, const ddt_stat_t
*src
, uint64_t neg
)
407 const uint64_t *s
= (const uint64_t *)src
;
408 uint64_t *d
= (uint64_t *)dst
;
409 uint64_t *d_end
= (uint64_t *)(dst
+ 1);
411 ASSERT(neg
== 0 || neg
== -1ULL); /* add or subtract */
414 *d
++ += (*s
++ ^ neg
) - neg
;
418 ddt_stat_update(ddt_t
*ddt
, ddt_entry_t
*dde
, uint64_t neg
)
421 ddt_histogram_t
*ddh
;
424 ddt_stat_generate(ddt
, dde
, &dds
);
426 bucket
= highbit64(dds
.dds_ref_blocks
) - 1;
429 ddh
= &ddt
->ddt_histogram
[dde
->dde_type
][dde
->dde_class
];
431 ddt_stat_add(&ddh
->ddh_stat
[bucket
], &dds
, neg
);
435 ddt_histogram_add(ddt_histogram_t
*dst
, const ddt_histogram_t
*src
)
439 for (h
= 0; h
< 64; h
++)
440 ddt_stat_add(&dst
->ddh_stat
[h
], &src
->ddh_stat
[h
], 0);
444 ddt_histogram_stat(ddt_stat_t
*dds
, const ddt_histogram_t
*ddh
)
448 bzero(dds
, sizeof (*dds
));
450 for (h
= 0; h
< 64; h
++)
451 ddt_stat_add(dds
, &ddh
->ddh_stat
[h
], 0);
455 ddt_histogram_empty(const ddt_histogram_t
*ddh
)
457 const uint64_t *s
= (const uint64_t *)ddh
;
458 const uint64_t *s_end
= (const uint64_t *)(ddh
+ 1);
468 ddt_get_dedup_object_stats(spa_t
*spa
, ddt_object_t
*ddo_total
)
472 enum ddt_class
class;
474 /* Sum the statistics we cached in ddt_object_sync(). */
475 for (c
= 0; c
< ZIO_CHECKSUM_FUNCTIONS
; c
++) {
476 ddt_t
*ddt
= spa
->spa_ddt
[c
];
477 for (type
= 0; type
< DDT_TYPES
; type
++) {
478 for (class = 0; class < DDT_CLASSES
;
481 &ddt
->ddt_object_stats
[type
][class];
482 ddo_total
->ddo_count
+= ddo
->ddo_count
;
483 ddo_total
->ddo_dspace
+= ddo
->ddo_dspace
;
484 ddo_total
->ddo_mspace
+= ddo
->ddo_mspace
;
489 /* ... and compute the averages. */
490 if (ddo_total
->ddo_count
!= 0) {
491 ddo_total
->ddo_dspace
/= ddo_total
->ddo_count
;
492 ddo_total
->ddo_mspace
/= ddo_total
->ddo_count
;
497 ddt_get_dedup_histogram(spa_t
*spa
, ddt_histogram_t
*ddh
)
501 enum ddt_class
class;
503 for (c
= 0; c
< ZIO_CHECKSUM_FUNCTIONS
; c
++) {
504 ddt_t
*ddt
= spa
->spa_ddt
[c
];
505 for (type
= 0; type
< DDT_TYPES
; type
++) {
506 for (class = 0; class < DDT_CLASSES
;
508 ddt_histogram_add(ddh
,
509 &ddt
->ddt_histogram_cache
[type
][class]);
516 ddt_get_dedup_stats(spa_t
*spa
, ddt_stat_t
*dds_total
)
518 ddt_histogram_t
*ddh_total
;
520 ddh_total
= kmem_zalloc(sizeof (ddt_histogram_t
), KM_SLEEP
);
521 ddt_get_dedup_histogram(spa
, ddh_total
);
522 ddt_histogram_stat(dds_total
, ddh_total
);
523 kmem_free(ddh_total
, sizeof (ddt_histogram_t
));
527 ddt_get_dedup_dspace(spa_t
*spa
)
529 ddt_stat_t dds_total
= { 0 };
531 ddt_get_dedup_stats(spa
, &dds_total
);
532 return (dds_total
.dds_ref_dsize
- dds_total
.dds_dsize
);
536 ddt_get_pool_dedup_ratio(spa_t
*spa
)
538 ddt_stat_t dds_total
= { 0 };
540 ddt_get_dedup_stats(spa
, &dds_total
);
541 if (dds_total
.dds_dsize
== 0)
544 return (dds_total
.dds_ref_dsize
* 100 / dds_total
.dds_dsize
);
548 ddt_ditto_copies_needed(ddt_t
*ddt
, ddt_entry_t
*dde
, ddt_phys_t
*ddp_willref
)
550 spa_t
*spa
= ddt
->ddt_spa
;
551 uint64_t total_refcnt
= 0;
552 uint64_t ditto
= spa
->spa_dedup_ditto
;
553 int total_copies
= 0;
554 int desired_copies
= 0;
557 for (p
= DDT_PHYS_SINGLE
; p
<= DDT_PHYS_TRIPLE
; p
++) {
558 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
559 zio_t
*zio
= dde
->dde_lead_zio
[p
];
560 uint64_t refcnt
= ddp
->ddp_refcnt
; /* committed refs */
562 refcnt
+= zio
->io_parent_count
; /* pending refs */
563 if (ddp
== ddp_willref
)
564 refcnt
++; /* caller's ref */
566 total_refcnt
+= refcnt
;
571 if (ditto
== 0 || ditto
> UINT32_MAX
)
574 if (total_refcnt
>= 1)
576 if (total_refcnt
>= ditto
)
578 if (total_refcnt
>= ditto
* ditto
)
581 return (MAX(desired_copies
, total_copies
) - total_copies
);
585 ddt_ditto_copies_present(ddt_entry_t
*dde
)
587 ddt_phys_t
*ddp
= &dde
->dde_phys
[DDT_PHYS_DITTO
];
588 dva_t
*dva
= ddp
->ddp_dva
;
589 int copies
= 0 - DVA_GET_GANG(dva
);
592 for (d
= 0; d
< SPA_DVAS_PER_BP
; d
++, dva
++)
593 if (DVA_IS_VALID(dva
))
596 ASSERT(copies
>= 0 && copies
< SPA_DVAS_PER_BP
);
602 ddt_compress(void *src
, uchar_t
*dst
, size_t s_len
, size_t d_len
)
604 uchar_t
*version
= dst
++;
605 int cpfunc
= ZIO_COMPRESS_ZLE
;
606 zio_compress_info_t
*ci
= &zio_compress_table
[cpfunc
];
609 ASSERT(d_len
>= s_len
+ 1); /* no compression plus version byte */
611 c_len
= ci
->ci_compress(src
, dst
, s_len
, d_len
- 1, ci
->ci_level
);
613 if (c_len
== s_len
) {
614 cpfunc
= ZIO_COMPRESS_OFF
;
615 bcopy(src
, dst
, s_len
);
620 if (ZFS_HOST_BYTEORDER
)
621 *version
|= DDT_COMPRESS_BYTEORDER_MASK
;
627 ddt_decompress(uchar_t
*src
, void *dst
, size_t s_len
, size_t d_len
)
629 uchar_t version
= *src
++;
630 int cpfunc
= version
& DDT_COMPRESS_FUNCTION_MASK
;
631 zio_compress_info_t
*ci
= &zio_compress_table
[cpfunc
];
633 if (ci
->ci_decompress
!= NULL
)
634 (void) ci
->ci_decompress(src
, dst
, s_len
, d_len
, ci
->ci_level
);
636 bcopy(src
, dst
, d_len
);
638 if (((version
& DDT_COMPRESS_BYTEORDER_MASK
) != 0) !=
639 (ZFS_HOST_BYTEORDER
!= 0))
640 byteswap_uint64_array(dst
, d_len
);
644 ddt_select_by_checksum(spa_t
*spa
, enum zio_checksum c
)
646 return (spa
->spa_ddt
[c
]);
650 ddt_select(spa_t
*spa
, const blkptr_t
*bp
)
652 return (spa
->spa_ddt
[BP_GET_CHECKSUM(bp
)]);
656 ddt_enter(ddt_t
*ddt
)
658 mutex_enter(&ddt
->ddt_lock
);
664 mutex_exit(&ddt
->ddt_lock
);
670 ddt_cache
= kmem_cache_create("ddt_cache",
671 sizeof (ddt_t
), 0, NULL
, NULL
, NULL
, NULL
, NULL
, 0);
672 ddt_entry_cache
= kmem_cache_create("ddt_entry_cache",
673 sizeof (ddt_entry_t
), 0, NULL
, NULL
, NULL
, NULL
, NULL
, 0);
679 kmem_cache_destroy(ddt_entry_cache
);
680 kmem_cache_destroy(ddt_cache
);
684 ddt_alloc(const ddt_key_t
*ddk
)
688 dde
= kmem_cache_alloc(ddt_entry_cache
, KM_SLEEP
);
689 bzero(dde
, sizeof (ddt_entry_t
));
690 cv_init(&dde
->dde_cv
, NULL
, CV_DEFAULT
, NULL
);
698 ddt_free(ddt_entry_t
*dde
)
702 ASSERT(!dde
->dde_loading
);
704 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++)
705 ASSERT(dde
->dde_lead_zio
[p
] == NULL
);
707 if (dde
->dde_repair_data
!= NULL
)
708 zio_buf_free(dde
->dde_repair_data
,
709 DDK_GET_PSIZE(&dde
->dde_key
));
711 cv_destroy(&dde
->dde_cv
);
712 kmem_cache_free(ddt_entry_cache
, dde
);
716 ddt_remove(ddt_t
*ddt
, ddt_entry_t
*dde
)
718 ASSERT(MUTEX_HELD(&ddt
->ddt_lock
));
720 avl_remove(&ddt
->ddt_tree
, dde
);
725 ddt_lookup(ddt_t
*ddt
, const blkptr_t
*bp
, boolean_t add
)
727 ddt_entry_t
*dde
, dde_search
;
729 enum ddt_class
class;
733 ASSERT(MUTEX_HELD(&ddt
->ddt_lock
));
735 ddt_key_fill(&dde_search
.dde_key
, bp
);
737 dde
= avl_find(&ddt
->ddt_tree
, &dde_search
, &where
);
741 dde
= ddt_alloc(&dde_search
.dde_key
);
742 avl_insert(&ddt
->ddt_tree
, dde
, where
);
745 while (dde
->dde_loading
)
746 cv_wait(&dde
->dde_cv
, &ddt
->ddt_lock
);
751 dde
->dde_loading
= B_TRUE
;
757 for (type
= 0; type
< DDT_TYPES
; type
++) {
758 for (class = 0; class < DDT_CLASSES
; class++) {
759 error
= ddt_object_lookup(ddt
, type
, class, dde
);
767 ASSERT(error
== 0 || error
== ENOENT
);
771 ASSERT(dde
->dde_loaded
== B_FALSE
);
772 ASSERT(dde
->dde_loading
== B_TRUE
);
774 dde
->dde_type
= type
; /* will be DDT_TYPES if no entry found */
775 dde
->dde_class
= class; /* will be DDT_CLASSES if no entry found */
776 dde
->dde_loaded
= B_TRUE
;
777 dde
->dde_loading
= B_FALSE
;
780 ddt_stat_update(ddt
, dde
, -1ULL);
782 cv_broadcast(&dde
->dde_cv
);
788 ddt_prefetch(spa_t
*spa
, const blkptr_t
*bp
)
793 enum ddt_class
class;
795 if (!zfs_dedup_prefetch
|| bp
== NULL
|| !BP_GET_DEDUP(bp
))
799 * We only remove the DDT once all tables are empty and only
800 * prefetch dedup blocks when there are entries in the DDT.
801 * Thus no locking is required as the DDT can't disappear on us.
803 ddt
= ddt_select(spa
, bp
);
804 ddt_key_fill(&dde
.dde_key
, bp
);
806 for (type
= 0; type
< DDT_TYPES
; type
++) {
807 for (class = 0; class < DDT_CLASSES
; class++) {
808 ddt_object_prefetch(ddt
, type
, class, &dde
);
814 ddt_entry_compare(const void *x1
, const void *x2
)
816 const ddt_entry_t
*dde1
= x1
;
817 const ddt_entry_t
*dde2
= x2
;
818 const uint64_t *u1
= (const uint64_t *)&dde1
->dde_key
;
819 const uint64_t *u2
= (const uint64_t *)&dde2
->dde_key
;
822 for (i
= 0; i
< DDT_KEY_WORDS
; i
++) {
833 ddt_table_alloc(spa_t
*spa
, enum zio_checksum c
)
837 ddt
= kmem_cache_alloc(ddt_cache
, KM_SLEEP
);
838 bzero(ddt
, sizeof (ddt_t
));
840 mutex_init(&ddt
->ddt_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
841 avl_create(&ddt
->ddt_tree
, ddt_entry_compare
,
842 sizeof (ddt_entry_t
), offsetof(ddt_entry_t
, dde_node
));
843 avl_create(&ddt
->ddt_repair_tree
, ddt_entry_compare
,
844 sizeof (ddt_entry_t
), offsetof(ddt_entry_t
, dde_node
));
845 ddt
->ddt_checksum
= c
;
847 ddt
->ddt_os
= spa
->spa_meta_objset
;
853 ddt_table_free(ddt_t
*ddt
)
855 ASSERT(avl_numnodes(&ddt
->ddt_tree
) == 0);
856 ASSERT(avl_numnodes(&ddt
->ddt_repair_tree
) == 0);
857 avl_destroy(&ddt
->ddt_tree
);
858 avl_destroy(&ddt
->ddt_repair_tree
);
859 mutex_destroy(&ddt
->ddt_lock
);
860 kmem_cache_free(ddt_cache
, ddt
);
864 ddt_create(spa_t
*spa
)
868 spa
->spa_dedup_checksum
= ZIO_DEDUPCHECKSUM
;
870 for (c
= 0; c
< ZIO_CHECKSUM_FUNCTIONS
; c
++)
871 spa
->spa_ddt
[c
] = ddt_table_alloc(spa
, c
);
879 enum ddt_class
class;
884 error
= zap_lookup(spa
->spa_meta_objset
, DMU_POOL_DIRECTORY_OBJECT
,
885 DMU_POOL_DDT_STATS
, sizeof (uint64_t), 1,
886 &spa
->spa_ddt_stat_object
);
889 return (error
== ENOENT
? 0 : error
);
891 for (c
= 0; c
< ZIO_CHECKSUM_FUNCTIONS
; c
++) {
892 ddt_t
*ddt
= spa
->spa_ddt
[c
];
893 for (type
= 0; type
< DDT_TYPES
; type
++) {
894 for (class = 0; class < DDT_CLASSES
;
896 error
= ddt_object_load(ddt
, type
, class);
897 if (error
!= 0 && error
!= ENOENT
)
903 * Seed the cached histograms.
905 bcopy(ddt
->ddt_histogram
, &ddt
->ddt_histogram_cache
,
906 sizeof (ddt
->ddt_histogram
));
913 ddt_unload(spa_t
*spa
)
917 for (c
= 0; c
< ZIO_CHECKSUM_FUNCTIONS
; c
++) {
918 if (spa
->spa_ddt
[c
]) {
919 ddt_table_free(spa
->spa_ddt
[c
]);
920 spa
->spa_ddt
[c
] = NULL
;
926 ddt_class_contains(spa_t
*spa
, enum ddt_class max_class
, const blkptr_t
*bp
)
931 enum ddt_class
class;
933 if (!BP_GET_DEDUP(bp
))
936 if (max_class
== DDT_CLASS_UNIQUE
)
939 ddt
= spa
->spa_ddt
[BP_GET_CHECKSUM(bp
)];
940 dde
= kmem_cache_alloc(ddt_entry_cache
, KM_SLEEP
);
942 ddt_key_fill(&(dde
->dde_key
), bp
);
944 for (type
= 0; type
< DDT_TYPES
; type
++) {
945 for (class = 0; class <= max_class
; class++) {
946 if (ddt_object_lookup(ddt
, type
, class, dde
) == 0) {
947 kmem_cache_free(ddt_entry_cache
, dde
);
953 kmem_cache_free(ddt_entry_cache
, dde
);
958 ddt_repair_start(ddt_t
*ddt
, const blkptr_t
*bp
)
963 enum ddt_class
class;
965 ddt_key_fill(&ddk
, bp
);
967 dde
= ddt_alloc(&ddk
);
969 for (type
= 0; type
< DDT_TYPES
; type
++) {
970 for (class = 0; class < DDT_CLASSES
; class++) {
972 * We can only do repair if there are multiple copies
973 * of the block. For anything in the UNIQUE class,
974 * there's definitely only one copy, so don't even try.
976 if (class != DDT_CLASS_UNIQUE
&&
977 ddt_object_lookup(ddt
, type
, class, dde
) == 0)
982 bzero(dde
->dde_phys
, sizeof (dde
->dde_phys
));
988 ddt_repair_done(ddt_t
*ddt
, ddt_entry_t
*dde
)
994 if (dde
->dde_repair_data
!= NULL
&& spa_writeable(ddt
->ddt_spa
) &&
995 avl_find(&ddt
->ddt_repair_tree
, dde
, &where
) == NULL
)
996 avl_insert(&ddt
->ddt_repair_tree
, dde
, where
);
1004 ddt_repair_entry_done(zio_t
*zio
)
1006 ddt_entry_t
*rdde
= zio
->io_private
;
1012 ddt_repair_entry(ddt_t
*ddt
, ddt_entry_t
*dde
, ddt_entry_t
*rdde
, zio_t
*rio
)
1014 ddt_phys_t
*ddp
= dde
->dde_phys
;
1015 ddt_phys_t
*rddp
= rdde
->dde_phys
;
1016 ddt_key_t
*ddk
= &dde
->dde_key
;
1017 ddt_key_t
*rddk
= &rdde
->dde_key
;
1022 zio
= zio_null(rio
, rio
->io_spa
, NULL
,
1023 ddt_repair_entry_done
, rdde
, rio
->io_flags
);
1025 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++, rddp
++) {
1026 if (ddp
->ddp_phys_birth
== 0 ||
1027 ddp
->ddp_phys_birth
!= rddp
->ddp_phys_birth
||
1028 bcmp(ddp
->ddp_dva
, rddp
->ddp_dva
, sizeof (ddp
->ddp_dva
)))
1030 ddt_bp_create(ddt
->ddt_checksum
, ddk
, ddp
, &blk
);
1031 zio_nowait(zio_rewrite(zio
, zio
->io_spa
, 0, &blk
,
1032 rdde
->dde_repair_data
, DDK_GET_PSIZE(rddk
), NULL
, NULL
,
1033 ZIO_PRIORITY_SYNC_WRITE
, ZIO_DDT_CHILD_FLAGS(zio
), NULL
));
1040 ddt_repair_table(ddt_t
*ddt
, zio_t
*rio
)
1042 spa_t
*spa
= ddt
->ddt_spa
;
1043 ddt_entry_t
*dde
, *rdde_next
, *rdde
;
1044 avl_tree_t
*t
= &ddt
->ddt_repair_tree
;
1047 if (spa_sync_pass(spa
) > 1)
1051 for (rdde
= avl_first(t
); rdde
!= NULL
; rdde
= rdde_next
) {
1052 rdde_next
= AVL_NEXT(t
, rdde
);
1053 avl_remove(&ddt
->ddt_repair_tree
, rdde
);
1055 ddt_bp_create(ddt
->ddt_checksum
, &rdde
->dde_key
, NULL
, &blk
);
1056 dde
= ddt_repair_start(ddt
, &blk
);
1057 ddt_repair_entry(ddt
, dde
, rdde
, rio
);
1058 ddt_repair_done(ddt
, dde
);
1065 ddt_sync_entry(ddt_t
*ddt
, ddt_entry_t
*dde
, dmu_tx_t
*tx
, uint64_t txg
)
1067 dsl_pool_t
*dp
= ddt
->ddt_spa
->spa_dsl_pool
;
1068 ddt_phys_t
*ddp
= dde
->dde_phys
;
1069 ddt_key_t
*ddk
= &dde
->dde_key
;
1070 enum ddt_type otype
= dde
->dde_type
;
1071 enum ddt_type ntype
= DDT_TYPE_CURRENT
;
1072 enum ddt_class oclass
= dde
->dde_class
;
1073 enum ddt_class nclass
;
1074 uint64_t total_refcnt
= 0;
1077 ASSERT(dde
->dde_loaded
);
1078 ASSERT(!dde
->dde_loading
);
1080 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++) {
1081 ASSERT(dde
->dde_lead_zio
[p
] == NULL
);
1082 if (ddp
->ddp_phys_birth
== 0) {
1083 ASSERT(ddp
->ddp_refcnt
== 0);
1086 if (p
== DDT_PHYS_DITTO
) {
1087 if (ddt_ditto_copies_needed(ddt
, dde
, NULL
) == 0)
1088 ddt_phys_free(ddt
, ddk
, ddp
, txg
);
1091 if (ddp
->ddp_refcnt
== 0)
1092 ddt_phys_free(ddt
, ddk
, ddp
, txg
);
1093 total_refcnt
+= ddp
->ddp_refcnt
;
1096 if (dde
->dde_phys
[DDT_PHYS_DITTO
].ddp_phys_birth
!= 0)
1097 nclass
= DDT_CLASS_DITTO
;
1098 else if (total_refcnt
> 1)
1099 nclass
= DDT_CLASS_DUPLICATE
;
1101 nclass
= DDT_CLASS_UNIQUE
;
1103 if (otype
!= DDT_TYPES
&&
1104 (otype
!= ntype
|| oclass
!= nclass
|| total_refcnt
== 0)) {
1105 VERIFY(ddt_object_remove(ddt
, otype
, oclass
, dde
, tx
) == 0);
1106 ASSERT(ddt_object_lookup(ddt
, otype
, oclass
, dde
) == ENOENT
);
1109 if (total_refcnt
!= 0) {
1110 dde
->dde_type
= ntype
;
1111 dde
->dde_class
= nclass
;
1112 ddt_stat_update(ddt
, dde
, 0);
1113 if (!ddt_object_exists(ddt
, ntype
, nclass
))
1114 ddt_object_create(ddt
, ntype
, nclass
, tx
);
1115 VERIFY(ddt_object_update(ddt
, ntype
, nclass
, dde
, tx
) == 0);
1118 * If the class changes, the order that we scan this bp
1119 * changes. If it decreases, we could miss it, so
1120 * scan it right now. (This covers both class changing
1121 * while we are doing ddt_walk(), and when we are
1124 if (nclass
< oclass
) {
1125 dsl_scan_ddt_entry(dp
->dp_scan
,
1126 ddt
->ddt_checksum
, dde
, tx
);
1132 ddt_sync_table(ddt_t
*ddt
, dmu_tx_t
*tx
, uint64_t txg
)
1134 spa_t
*spa
= ddt
->ddt_spa
;
1136 void *cookie
= NULL
;
1138 enum ddt_class
class;
1140 if (avl_numnodes(&ddt
->ddt_tree
) == 0)
1143 ASSERT(spa
->spa_uberblock
.ub_version
>= SPA_VERSION_DEDUP
);
1145 if (spa
->spa_ddt_stat_object
== 0) {
1146 spa
->spa_ddt_stat_object
= zap_create_link(ddt
->ddt_os
,
1147 DMU_OT_DDT_STATS
, DMU_POOL_DIRECTORY_OBJECT
,
1148 DMU_POOL_DDT_STATS
, tx
);
1151 while ((dde
= avl_destroy_nodes(&ddt
->ddt_tree
, &cookie
)) != NULL
) {
1152 ddt_sync_entry(ddt
, dde
, tx
, txg
);
1156 for (type
= 0; type
< DDT_TYPES
; type
++) {
1157 uint64_t add
, count
= 0;
1158 for (class = 0; class < DDT_CLASSES
; class++) {
1159 if (ddt_object_exists(ddt
, type
, class)) {
1160 ddt_object_sync(ddt
, type
, class, tx
);
1161 VERIFY(ddt_object_count(ddt
, type
, class,
1166 for (class = 0; class < DDT_CLASSES
; class++) {
1167 if (count
== 0 && ddt_object_exists(ddt
, type
, class))
1168 ddt_object_destroy(ddt
, type
, class, tx
);
1172 bcopy(ddt
->ddt_histogram
, &ddt
->ddt_histogram_cache
,
1173 sizeof (ddt
->ddt_histogram
));
1177 ddt_sync(spa_t
*spa
, uint64_t txg
)
1180 zio_t
*rio
= zio_root(spa
, NULL
, NULL
,
1181 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
);
1182 enum zio_checksum c
;
1184 ASSERT(spa_syncing_txg(spa
) == txg
);
1186 tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, txg
);
1188 for (c
= 0; c
< ZIO_CHECKSUM_FUNCTIONS
; c
++) {
1189 ddt_t
*ddt
= spa
->spa_ddt
[c
];
1192 ddt_sync_table(ddt
, tx
, txg
);
1193 ddt_repair_table(ddt
, rio
);
1196 (void) zio_wait(rio
);
1202 ddt_walk(spa_t
*spa
, ddt_bookmark_t
*ddb
, ddt_entry_t
*dde
)
1207 ddt_t
*ddt
= spa
->spa_ddt
[ddb
->ddb_checksum
];
1209 if (ddt_object_exists(ddt
, ddb
->ddb_type
,
1211 error
= ddt_object_walk(ddt
,
1212 ddb
->ddb_type
, ddb
->ddb_class
,
1213 &ddb
->ddb_cursor
, dde
);
1215 dde
->dde_type
= ddb
->ddb_type
;
1216 dde
->dde_class
= ddb
->ddb_class
;
1219 if (error
!= ENOENT
)
1221 ddb
->ddb_cursor
= 0;
1222 } while (++ddb
->ddb_checksum
< ZIO_CHECKSUM_FUNCTIONS
);
1223 ddb
->ddb_checksum
= 0;
1224 } while (++ddb
->ddb_type
< DDT_TYPES
);
1226 } while (++ddb
->ddb_class
< DDT_CLASSES
);
1228 return (SET_ERROR(ENOENT
));
1231 #if defined(_KERNEL) && defined(HAVE_SPL)
1232 module_param(zfs_dedup_prefetch
, int, 0644);
1233 MODULE_PARM_DESC(zfs_dedup_prefetch
, "Enable prefetching dedup-ed blks");