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.
26 #include <sys/zfs_context.h>
28 #include <sys/spa_impl.h>
32 #include <sys/dmu_tx.h>
34 #include <sys/dsl_pool.h>
35 #include <sys/zio_checksum.h>
36 #include <sys/zio_compress.h>
37 #include <sys/dsl_scan.h>
40 * Enable/disable prefetching of dedup-ed blocks which are going to be freed.
42 int zfs_dedup_prefetch
= 1;
44 static const ddt_ops_t
*ddt_ops
[DDT_TYPES
] = {
48 static const char *ddt_class_name
[DDT_CLASSES
] = {
55 ddt_object_create(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
58 spa_t
*spa
= ddt
->ddt_spa
;
59 objset_t
*os
= ddt
->ddt_os
;
60 uint64_t *objectp
= &ddt
->ddt_object
[type
][class];
61 boolean_t prehash
= zio_checksum_table
[ddt
->ddt_checksum
].ci_dedup
;
62 char name
[DDT_NAMELEN
];
64 ddt_object_name(ddt
, type
, class, name
);
66 ASSERT(*objectp
== 0);
67 VERIFY(ddt_ops
[type
]->ddt_op_create(os
, objectp
, tx
, prehash
) == 0);
68 ASSERT(*objectp
!= 0);
70 VERIFY(zap_add(os
, DMU_POOL_DIRECTORY_OBJECT
, name
,
71 sizeof (uint64_t), 1, objectp
, tx
) == 0);
73 VERIFY(zap_add(os
, spa
->spa_ddt_stat_object
, name
,
74 sizeof (uint64_t), sizeof (ddt_histogram_t
) / sizeof (uint64_t),
75 &ddt
->ddt_histogram
[type
][class], tx
) == 0);
79 ddt_object_destroy(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
82 spa_t
*spa
= ddt
->ddt_spa
;
83 objset_t
*os
= ddt
->ddt_os
;
84 uint64_t *objectp
= &ddt
->ddt_object
[type
][class];
85 char name
[DDT_NAMELEN
];
87 ddt_object_name(ddt
, type
, class, name
);
89 ASSERT(*objectp
!= 0);
90 ASSERT(ddt_object_count(ddt
, type
, class) == 0);
91 ASSERT(ddt_histogram_empty(&ddt
->ddt_histogram
[type
][class]));
92 VERIFY(zap_remove(os
, DMU_POOL_DIRECTORY_OBJECT
, name
, tx
) == 0);
93 VERIFY(zap_remove(os
, spa
->spa_ddt_stat_object
, name
, tx
) == 0);
94 VERIFY(ddt_ops
[type
]->ddt_op_destroy(os
, *objectp
, tx
) == 0);
95 bzero(&ddt
->ddt_object_stats
[type
][class], sizeof (ddt_object_t
));
101 ddt_object_load(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class)
103 ddt_object_t
*ddo
= &ddt
->ddt_object_stats
[type
][class];
104 dmu_object_info_t doi
;
105 char name
[DDT_NAMELEN
];
108 ddt_object_name(ddt
, type
, class, name
);
110 error
= zap_lookup(ddt
->ddt_os
, DMU_POOL_DIRECTORY_OBJECT
, name
,
111 sizeof (uint64_t), 1, &ddt
->ddt_object
[type
][class]);
116 error
= zap_lookup(ddt
->ddt_os
, ddt
->ddt_spa
->spa_ddt_stat_object
, name
,
117 sizeof (uint64_t), sizeof (ddt_histogram_t
) / sizeof (uint64_t),
118 &ddt
->ddt_histogram
[type
][class]);
121 * Seed the cached statistics.
123 error
= ddt_object_info(ddt
, type
, class, &doi
);
127 ddo
->ddo_count
= ddt_object_count(ddt
, type
, class);
128 ddo
->ddo_dspace
= doi
.doi_physical_blocks_512
<< 9;
129 ddo
->ddo_mspace
= doi
.doi_fill_count
* doi
.doi_data_block_size
;
136 ddt_object_sync(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
139 ddt_object_t
*ddo
= &ddt
->ddt_object_stats
[type
][class];
140 dmu_object_info_t doi
;
141 char name
[DDT_NAMELEN
];
143 ddt_object_name(ddt
, type
, class, name
);
145 VERIFY(zap_update(ddt
->ddt_os
, ddt
->ddt_spa
->spa_ddt_stat_object
, name
,
146 sizeof (uint64_t), sizeof (ddt_histogram_t
) / sizeof (uint64_t),
147 &ddt
->ddt_histogram
[type
][class], tx
) == 0);
150 * Cache DDT statistics; this is the only time they'll change.
152 VERIFY(ddt_object_info(ddt
, type
, class, &doi
) == 0);
154 ddo
->ddo_count
= ddt_object_count(ddt
, type
, class);
155 ddo
->ddo_dspace
= doi
.doi_physical_blocks_512
<< 9;
156 ddo
->ddo_mspace
= doi
.doi_fill_count
* doi
.doi_data_block_size
;
160 ddt_object_lookup(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
163 if (!ddt_object_exists(ddt
, type
, class))
166 return (ddt_ops
[type
]->ddt_op_lookup(ddt
->ddt_os
,
167 ddt
->ddt_object
[type
][class], dde
));
171 ddt_object_prefetch(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
174 if (!ddt_object_exists(ddt
, type
, class))
177 ddt_ops
[type
]->ddt_op_prefetch(ddt
->ddt_os
,
178 ddt
->ddt_object
[type
][class], dde
);
182 ddt_object_update(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
183 ddt_entry_t
*dde
, dmu_tx_t
*tx
)
185 ASSERT(ddt_object_exists(ddt
, type
, class));
187 return (ddt_ops
[type
]->ddt_op_update(ddt
->ddt_os
,
188 ddt
->ddt_object
[type
][class], dde
, tx
));
192 ddt_object_remove(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
193 ddt_entry_t
*dde
, dmu_tx_t
*tx
)
195 ASSERT(ddt_object_exists(ddt
, type
, class));
197 return (ddt_ops
[type
]->ddt_op_remove(ddt
->ddt_os
,
198 ddt
->ddt_object
[type
][class], dde
, tx
));
202 ddt_object_walk(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
203 uint64_t *walk
, ddt_entry_t
*dde
)
205 ASSERT(ddt_object_exists(ddt
, type
, class));
207 return (ddt_ops
[type
]->ddt_op_walk(ddt
->ddt_os
,
208 ddt
->ddt_object
[type
][class], dde
, walk
));
212 ddt_object_count(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class)
214 ASSERT(ddt_object_exists(ddt
, type
, class));
216 return (ddt_ops
[type
]->ddt_op_count(ddt
->ddt_os
,
217 ddt
->ddt_object
[type
][class]));
221 ddt_object_info(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
222 dmu_object_info_t
*doi
)
224 if (!ddt_object_exists(ddt
, type
, class))
227 return (dmu_object_info(ddt
->ddt_os
, ddt
->ddt_object
[type
][class],
232 ddt_object_exists(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class)
234 return (!!ddt
->ddt_object
[type
][class]);
238 ddt_object_name(ddt_t
*ddt
, enum ddt_type type
, enum ddt_class
class,
241 (void) sprintf(name
, DMU_POOL_DDT
,
242 zio_checksum_table
[ddt
->ddt_checksum
].ci_name
,
243 ddt_ops
[type
]->ddt_op_name
, ddt_class_name
[class]);
247 ddt_bp_fill(const ddt_phys_t
*ddp
, blkptr_t
*bp
, uint64_t txg
)
252 for (d
= 0; d
< SPA_DVAS_PER_BP
; d
++)
253 bp
->blk_dva
[d
] = ddp
->ddp_dva
[d
];
254 BP_SET_BIRTH(bp
, txg
, ddp
->ddp_phys_birth
);
258 ddt_bp_create(enum zio_checksum checksum
,
259 const ddt_key_t
*ddk
, const ddt_phys_t
*ddp
, blkptr_t
*bp
)
264 ddt_bp_fill(ddp
, bp
, ddp
->ddp_phys_birth
);
266 bp
->blk_cksum
= ddk
->ddk_cksum
;
269 BP_SET_LSIZE(bp
, DDK_GET_LSIZE(ddk
));
270 BP_SET_PSIZE(bp
, DDK_GET_PSIZE(ddk
));
271 BP_SET_COMPRESS(bp
, DDK_GET_COMPRESS(ddk
));
272 BP_SET_CHECKSUM(bp
, checksum
);
273 BP_SET_TYPE(bp
, DMU_OT_DEDUP
);
276 BP_SET_BYTEORDER(bp
, ZFS_HOST_BYTEORDER
);
280 ddt_key_fill(ddt_key_t
*ddk
, const blkptr_t
*bp
)
282 ddk
->ddk_cksum
= bp
->blk_cksum
;
285 DDK_SET_LSIZE(ddk
, BP_GET_LSIZE(bp
));
286 DDK_SET_PSIZE(ddk
, BP_GET_PSIZE(bp
));
287 DDK_SET_COMPRESS(ddk
, BP_GET_COMPRESS(bp
));
291 ddt_phys_fill(ddt_phys_t
*ddp
, const blkptr_t
*bp
)
294 ASSERT(ddp
->ddp_phys_birth
== 0);
296 for (d
= 0; d
< SPA_DVAS_PER_BP
; d
++)
297 ddp
->ddp_dva
[d
] = bp
->blk_dva
[d
];
298 ddp
->ddp_phys_birth
= BP_PHYSICAL_BIRTH(bp
);
302 ddt_phys_clear(ddt_phys_t
*ddp
)
304 bzero(ddp
, sizeof (*ddp
));
308 ddt_phys_addref(ddt_phys_t
*ddp
)
314 ddt_phys_decref(ddt_phys_t
*ddp
)
316 ASSERT((int64_t)ddp
->ddp_refcnt
> 0);
321 ddt_phys_free(ddt_t
*ddt
, ddt_key_t
*ddk
, ddt_phys_t
*ddp
, uint64_t txg
)
325 ddt_bp_create(ddt
->ddt_checksum
, ddk
, ddp
, &blk
);
327 zio_free(ddt
->ddt_spa
, txg
, &blk
);
331 ddt_phys_select(const ddt_entry_t
*dde
, const blkptr_t
*bp
)
333 ddt_phys_t
*ddp
= (ddt_phys_t
*)dde
->dde_phys
;
336 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++) {
337 if (DVA_EQUAL(BP_IDENTITY(bp
), &ddp
->ddp_dva
[0]) &&
338 BP_PHYSICAL_BIRTH(bp
) == ddp
->ddp_phys_birth
)
345 ddt_phys_total_refcnt(const ddt_entry_t
*dde
)
350 for (p
= DDT_PHYS_SINGLE
; p
<= DDT_PHYS_TRIPLE
; p
++)
351 refcnt
+= dde
->dde_phys
[p
].ddp_refcnt
;
357 ddt_stat_generate(ddt_t
*ddt
, ddt_entry_t
*dde
, ddt_stat_t
*dds
)
359 spa_t
*spa
= ddt
->ddt_spa
;
360 ddt_phys_t
*ddp
= dde
->dde_phys
;
361 ddt_key_t
*ddk
= &dde
->dde_key
;
362 uint64_t lsize
= DDK_GET_LSIZE(ddk
);
363 uint64_t psize
= DDK_GET_PSIZE(ddk
);
366 bzero(dds
, sizeof (*dds
));
368 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++) {
370 uint64_t refcnt
= ddp
->ddp_refcnt
;
372 if (ddp
->ddp_phys_birth
== 0)
375 for (d
= 0; d
< SPA_DVAS_PER_BP
; d
++)
376 dsize
+= dva_get_dsize_sync(spa
, &ddp
->ddp_dva
[d
]);
378 dds
->dds_blocks
+= 1;
379 dds
->dds_lsize
+= lsize
;
380 dds
->dds_psize
+= psize
;
381 dds
->dds_dsize
+= dsize
;
383 dds
->dds_ref_blocks
+= refcnt
;
384 dds
->dds_ref_lsize
+= lsize
* refcnt
;
385 dds
->dds_ref_psize
+= psize
* refcnt
;
386 dds
->dds_ref_dsize
+= dsize
* refcnt
;
391 ddt_stat_add(ddt_stat_t
*dst
, const ddt_stat_t
*src
, uint64_t neg
)
393 const uint64_t *s
= (const uint64_t *)src
;
394 uint64_t *d
= (uint64_t *)dst
;
395 uint64_t *d_end
= (uint64_t *)(dst
+ 1);
397 ASSERT(neg
== 0 || neg
== -1ULL); /* add or subtract */
400 *d
++ += (*s
++ ^ neg
) - neg
;
404 ddt_stat_update(ddt_t
*ddt
, ddt_entry_t
*dde
, uint64_t neg
)
407 ddt_histogram_t
*ddh
;
410 ddt_stat_generate(ddt
, dde
, &dds
);
412 bucket
= highbit(dds
.dds_ref_blocks
) - 1;
415 ddh
= &ddt
->ddt_histogram
[dde
->dde_type
][dde
->dde_class
];
417 ddt_stat_add(&ddh
->ddh_stat
[bucket
], &dds
, neg
);
421 ddt_histogram_add(ddt_histogram_t
*dst
, const ddt_histogram_t
*src
)
425 for (h
= 0; h
< 64; h
++)
426 ddt_stat_add(&dst
->ddh_stat
[h
], &src
->ddh_stat
[h
], 0);
430 ddt_histogram_stat(ddt_stat_t
*dds
, const ddt_histogram_t
*ddh
)
434 bzero(dds
, sizeof (*dds
));
436 for (h
= 0; h
< 64; h
++)
437 ddt_stat_add(dds
, &ddh
->ddh_stat
[h
], 0);
441 ddt_histogram_empty(const ddt_histogram_t
*ddh
)
443 const uint64_t *s
= (const uint64_t *)ddh
;
444 const uint64_t *s_end
= (const uint64_t *)(ddh
+ 1);
454 ddt_get_dedup_object_stats(spa_t
*spa
, ddt_object_t
*ddo_total
)
458 enum ddt_class
class;
460 /* Sum the statistics we cached in ddt_object_sync(). */
461 for (c
= 0; c
< ZIO_CHECKSUM_FUNCTIONS
; c
++) {
462 ddt_t
*ddt
= spa
->spa_ddt
[c
];
463 for (type
= 0; type
< DDT_TYPES
; type
++) {
464 for (class = 0; class < DDT_CLASSES
;
467 &ddt
->ddt_object_stats
[type
][class];
468 ddo_total
->ddo_count
+= ddo
->ddo_count
;
469 ddo_total
->ddo_dspace
+= ddo
->ddo_dspace
;
470 ddo_total
->ddo_mspace
+= ddo
->ddo_mspace
;
475 /* ... and compute the averages. */
476 if (ddo_total
->ddo_count
!= 0) {
477 ddo_total
->ddo_dspace
/= ddo_total
->ddo_count
;
478 ddo_total
->ddo_mspace
/= ddo_total
->ddo_count
;
483 ddt_get_dedup_histogram(spa_t
*spa
, ddt_histogram_t
*ddh
)
487 enum ddt_class
class;
489 for (c
= 0; c
< ZIO_CHECKSUM_FUNCTIONS
; c
++) {
490 ddt_t
*ddt
= spa
->spa_ddt
[c
];
491 for (type
= 0; type
< DDT_TYPES
; type
++) {
492 for (class = 0; class < DDT_CLASSES
;
494 ddt_histogram_add(ddh
,
495 &ddt
->ddt_histogram_cache
[type
][class]);
502 ddt_get_dedup_stats(spa_t
*spa
, ddt_stat_t
*dds_total
)
504 ddt_histogram_t
*ddh_total
;
506 /* XXX: Move to a slab */
507 ddh_total
= kmem_zalloc(sizeof (ddt_histogram_t
), KM_PUSHPAGE
);
508 ddt_get_dedup_histogram(spa
, ddh_total
);
509 ddt_histogram_stat(dds_total
, ddh_total
);
510 kmem_free(ddh_total
, sizeof (ddt_histogram_t
));
514 ddt_get_dedup_dspace(spa_t
*spa
)
516 ddt_stat_t dds_total
= { 0 };
518 ddt_get_dedup_stats(spa
, &dds_total
);
519 return (dds_total
.dds_ref_dsize
- dds_total
.dds_dsize
);
523 ddt_get_pool_dedup_ratio(spa_t
*spa
)
525 ddt_stat_t dds_total
= { 0 };
527 ddt_get_dedup_stats(spa
, &dds_total
);
528 if (dds_total
.dds_dsize
== 0)
531 return (dds_total
.dds_ref_dsize
* 100 / dds_total
.dds_dsize
);
535 ddt_ditto_copies_needed(ddt_t
*ddt
, ddt_entry_t
*dde
, ddt_phys_t
*ddp_willref
)
537 spa_t
*spa
= ddt
->ddt_spa
;
538 uint64_t total_refcnt
= 0;
539 uint64_t ditto
= spa
->spa_dedup_ditto
;
540 int total_copies
= 0;
541 int desired_copies
= 0;
544 for (p
= DDT_PHYS_SINGLE
; p
<= DDT_PHYS_TRIPLE
; p
++) {
545 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
546 zio_t
*zio
= dde
->dde_lead_zio
[p
];
547 uint64_t refcnt
= ddp
->ddp_refcnt
; /* committed refs */
549 refcnt
+= zio
->io_parent_count
; /* pending refs */
550 if (ddp
== ddp_willref
)
551 refcnt
++; /* caller's ref */
553 total_refcnt
+= refcnt
;
558 if (ditto
== 0 || ditto
> UINT32_MAX
)
561 if (total_refcnt
>= 1)
563 if (total_refcnt
>= ditto
)
565 if (total_refcnt
>= ditto
* ditto
)
568 return (MAX(desired_copies
, total_copies
) - total_copies
);
572 ddt_ditto_copies_present(ddt_entry_t
*dde
)
574 ddt_phys_t
*ddp
= &dde
->dde_phys
[DDT_PHYS_DITTO
];
575 dva_t
*dva
= ddp
->ddp_dva
;
576 int copies
= 0 - DVA_GET_GANG(dva
);
579 for (d
= 0; d
< SPA_DVAS_PER_BP
; d
++, dva
++)
580 if (DVA_IS_VALID(dva
))
583 ASSERT(copies
>= 0 && copies
< SPA_DVAS_PER_BP
);
589 ddt_compress(void *src
, uchar_t
*dst
, size_t s_len
, size_t d_len
)
591 uchar_t
*version
= dst
++;
592 int cpfunc
= ZIO_COMPRESS_ZLE
;
593 zio_compress_info_t
*ci
= &zio_compress_table
[cpfunc
];
596 ASSERT(d_len
>= s_len
+ 1); /* no compression plus version byte */
598 c_len
= ci
->ci_compress(src
, dst
, s_len
, d_len
- 1, ci
->ci_level
);
600 if (c_len
== s_len
) {
601 cpfunc
= ZIO_COMPRESS_OFF
;
602 bcopy(src
, dst
, s_len
);
605 *version
= (ZFS_HOST_BYTEORDER
& DDT_COMPRESS_BYTEORDER_MASK
) | cpfunc
;
611 ddt_decompress(uchar_t
*src
, void *dst
, size_t s_len
, size_t d_len
)
613 uchar_t version
= *src
++;
614 int cpfunc
= version
& DDT_COMPRESS_FUNCTION_MASK
;
615 zio_compress_info_t
*ci
= &zio_compress_table
[cpfunc
];
617 if (ci
->ci_decompress
!= NULL
)
618 (void) ci
->ci_decompress(src
, dst
, s_len
, d_len
, ci
->ci_level
);
620 bcopy(src
, dst
, d_len
);
622 if ((version
^ ZFS_HOST_BYTEORDER
) & DDT_COMPRESS_BYTEORDER_MASK
)
623 byteswap_uint64_array(dst
, d_len
);
627 ddt_select_by_checksum(spa_t
*spa
, enum zio_checksum c
)
629 return (spa
->spa_ddt
[c
]);
633 ddt_select(spa_t
*spa
, const blkptr_t
*bp
)
635 return (spa
->spa_ddt
[BP_GET_CHECKSUM(bp
)]);
639 ddt_enter(ddt_t
*ddt
)
641 mutex_enter(&ddt
->ddt_lock
);
647 mutex_exit(&ddt
->ddt_lock
);
651 ddt_alloc(const ddt_key_t
*ddk
)
655 /* XXX: Move to a slab */
656 dde
= kmem_zalloc(sizeof (ddt_entry_t
), KM_SLEEP
);
657 cv_init(&dde
->dde_cv
, NULL
, CV_DEFAULT
, NULL
);
665 ddt_free(ddt_entry_t
*dde
)
669 ASSERT(!dde
->dde_loading
);
671 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++)
672 ASSERT(dde
->dde_lead_zio
[p
] == NULL
);
674 if (dde
->dde_repair_data
!= NULL
)
675 zio_buf_free(dde
->dde_repair_data
,
676 DDK_GET_PSIZE(&dde
->dde_key
));
678 cv_destroy(&dde
->dde_cv
);
679 kmem_free(dde
, sizeof (*dde
));
683 ddt_remove(ddt_t
*ddt
, ddt_entry_t
*dde
)
685 ASSERT(MUTEX_HELD(&ddt
->ddt_lock
));
687 avl_remove(&ddt
->ddt_tree
, dde
);
692 ddt_lookup(ddt_t
*ddt
, const blkptr_t
*bp
, boolean_t add
)
694 ddt_entry_t
*dde
, dde_search
;
696 enum ddt_class
class;
700 ASSERT(MUTEX_HELD(&ddt
->ddt_lock
));
702 ddt_key_fill(&dde_search
.dde_key
, bp
);
704 dde
= avl_find(&ddt
->ddt_tree
, &dde_search
, &where
);
708 dde
= ddt_alloc(&dde_search
.dde_key
);
709 avl_insert(&ddt
->ddt_tree
, dde
, where
);
712 while (dde
->dde_loading
)
713 cv_wait(&dde
->dde_cv
, &ddt
->ddt_lock
);
718 dde
->dde_loading
= B_TRUE
;
724 for (type
= 0; type
< DDT_TYPES
; type
++) {
725 for (class = 0; class < DDT_CLASSES
; class++) {
726 error
= ddt_object_lookup(ddt
, type
, class, dde
);
734 ASSERT(error
== 0 || error
== ENOENT
);
738 ASSERT(dde
->dde_loaded
== B_FALSE
);
739 ASSERT(dde
->dde_loading
== B_TRUE
);
741 dde
->dde_type
= type
; /* will be DDT_TYPES if no entry found */
742 dde
->dde_class
= class; /* will be DDT_CLASSES if no entry found */
743 dde
->dde_loaded
= B_TRUE
;
744 dde
->dde_loading
= B_FALSE
;
747 ddt_stat_update(ddt
, dde
, -1ULL);
749 cv_broadcast(&dde
->dde_cv
);
755 ddt_prefetch(spa_t
*spa
, const blkptr_t
*bp
)
760 enum ddt_class
class;
762 if (!zfs_dedup_prefetch
|| bp
== NULL
|| !BP_GET_DEDUP(bp
))
766 * We only remove the DDT once all tables are empty and only
767 * prefetch dedup blocks when there are entries in the DDT.
768 * Thus no locking is required as the DDT can't disappear on us.
770 ddt
= ddt_select(spa
, bp
);
771 ddt_key_fill(&dde
.dde_key
, bp
);
773 for (type
= 0; type
< DDT_TYPES
; type
++) {
774 for (class = 0; class < DDT_CLASSES
; class++) {
775 ddt_object_prefetch(ddt
, type
, class, &dde
);
781 ddt_entry_compare(const void *x1
, const void *x2
)
783 const ddt_entry_t
*dde1
= x1
;
784 const ddt_entry_t
*dde2
= x2
;
785 const uint64_t *u1
= (const uint64_t *)&dde1
->dde_key
;
786 const uint64_t *u2
= (const uint64_t *)&dde2
->dde_key
;
789 for (i
= 0; i
< DDT_KEY_WORDS
; i
++) {
800 ddt_table_alloc(spa_t
*spa
, enum zio_checksum c
)
804 /* XXX: Move to a slab */
805 ddt
= kmem_zalloc(sizeof (*ddt
), KM_SLEEP
| KM_NODEBUG
);
807 mutex_init(&ddt
->ddt_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
808 avl_create(&ddt
->ddt_tree
, ddt_entry_compare
,
809 sizeof (ddt_entry_t
), offsetof(ddt_entry_t
, dde_node
));
810 avl_create(&ddt
->ddt_repair_tree
, ddt_entry_compare
,
811 sizeof (ddt_entry_t
), offsetof(ddt_entry_t
, dde_node
));
812 ddt
->ddt_checksum
= c
;
814 ddt
->ddt_os
= spa
->spa_meta_objset
;
820 ddt_table_free(ddt_t
*ddt
)
822 ASSERT(avl_numnodes(&ddt
->ddt_tree
) == 0);
823 ASSERT(avl_numnodes(&ddt
->ddt_repair_tree
) == 0);
824 avl_destroy(&ddt
->ddt_tree
);
825 avl_destroy(&ddt
->ddt_repair_tree
);
826 mutex_destroy(&ddt
->ddt_lock
);
827 kmem_free(ddt
, sizeof (*ddt
));
831 ddt_create(spa_t
*spa
)
835 spa
->spa_dedup_checksum
= ZIO_DEDUPCHECKSUM
;
837 for (c
= 0; c
< ZIO_CHECKSUM_FUNCTIONS
; c
++)
838 spa
->spa_ddt
[c
] = ddt_table_alloc(spa
, c
);
846 enum ddt_class
class;
851 error
= zap_lookup(spa
->spa_meta_objset
, DMU_POOL_DIRECTORY_OBJECT
,
852 DMU_POOL_DDT_STATS
, sizeof (uint64_t), 1,
853 &spa
->spa_ddt_stat_object
);
856 return (error
== ENOENT
? 0 : error
);
858 for (c
= 0; c
< ZIO_CHECKSUM_FUNCTIONS
; c
++) {
859 ddt_t
*ddt
= spa
->spa_ddt
[c
];
860 for (type
= 0; type
< DDT_TYPES
; type
++) {
861 for (class = 0; class < DDT_CLASSES
;
863 error
= ddt_object_load(ddt
, type
, class);
864 if (error
!= 0 && error
!= ENOENT
)
870 * Seed the cached histograms.
872 bcopy(ddt
->ddt_histogram
, &ddt
->ddt_histogram_cache
,
873 sizeof (ddt
->ddt_histogram
));
880 ddt_unload(spa_t
*spa
)
884 for (c
= 0; c
< ZIO_CHECKSUM_FUNCTIONS
; c
++) {
885 if (spa
->spa_ddt
[c
]) {
886 ddt_table_free(spa
->spa_ddt
[c
]);
887 spa
->spa_ddt
[c
] = NULL
;
893 ddt_class_contains(spa_t
*spa
, enum ddt_class max_class
, const blkptr_t
*bp
)
898 enum ddt_class
class;
900 if (!BP_GET_DEDUP(bp
))
903 if (max_class
== DDT_CLASS_UNIQUE
)
906 ddt
= spa
->spa_ddt
[BP_GET_CHECKSUM(bp
)];
907 dde
= kmem_alloc(sizeof(ddt_entry_t
), KM_SLEEP
);
909 ddt_key_fill(&(dde
->dde_key
), bp
);
911 for (type
= 0; type
< DDT_TYPES
; type
++) {
912 for (class = 0; class <= max_class
; class++) {
913 if (ddt_object_lookup(ddt
, type
, class, dde
) == 0) {
914 kmem_free(dde
, sizeof(ddt_entry_t
));
920 kmem_free(dde
, sizeof(ddt_entry_t
));
925 ddt_repair_start(ddt_t
*ddt
, const blkptr_t
*bp
)
930 enum ddt_class
class;
932 ddt_key_fill(&ddk
, bp
);
934 dde
= ddt_alloc(&ddk
);
936 for (type
= 0; type
< DDT_TYPES
; type
++) {
937 for (class = 0; class < DDT_CLASSES
; class++) {
939 * We can only do repair if there are multiple copies
940 * of the block. For anything in the UNIQUE class,
941 * there's definitely only one copy, so don't even try.
943 if (class != DDT_CLASS_UNIQUE
&&
944 ddt_object_lookup(ddt
, type
, class, dde
) == 0)
949 bzero(dde
->dde_phys
, sizeof (dde
->dde_phys
));
955 ddt_repair_done(ddt_t
*ddt
, ddt_entry_t
*dde
)
961 if (dde
->dde_repair_data
!= NULL
&& spa_writeable(ddt
->ddt_spa
) &&
962 avl_find(&ddt
->ddt_repair_tree
, dde
, &where
) == NULL
)
963 avl_insert(&ddt
->ddt_repair_tree
, dde
, where
);
971 ddt_repair_entry_done(zio_t
*zio
)
973 ddt_entry_t
*rdde
= zio
->io_private
;
979 ddt_repair_entry(ddt_t
*ddt
, ddt_entry_t
*dde
, ddt_entry_t
*rdde
, zio_t
*rio
)
981 ddt_phys_t
*ddp
= dde
->dde_phys
;
982 ddt_phys_t
*rddp
= rdde
->dde_phys
;
983 ddt_key_t
*ddk
= &dde
->dde_key
;
984 ddt_key_t
*rddk
= &rdde
->dde_key
;
989 zio
= zio_null(rio
, rio
->io_spa
, NULL
,
990 ddt_repair_entry_done
, rdde
, rio
->io_flags
);
992 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++, rddp
++) {
993 if (ddp
->ddp_phys_birth
== 0 ||
994 ddp
->ddp_phys_birth
!= rddp
->ddp_phys_birth
||
995 bcmp(ddp
->ddp_dva
, rddp
->ddp_dva
, sizeof (ddp
->ddp_dva
)))
997 ddt_bp_create(ddt
->ddt_checksum
, ddk
, ddp
, &blk
);
998 zio_nowait(zio_rewrite(zio
, zio
->io_spa
, 0, &blk
,
999 rdde
->dde_repair_data
, DDK_GET_PSIZE(rddk
), NULL
, NULL
,
1000 ZIO_PRIORITY_SYNC_WRITE
, ZIO_DDT_CHILD_FLAGS(zio
), NULL
));
1007 ddt_repair_table(ddt_t
*ddt
, zio_t
*rio
)
1009 spa_t
*spa
= ddt
->ddt_spa
;
1010 ddt_entry_t
*dde
, *rdde_next
, *rdde
;
1011 avl_tree_t
*t
= &ddt
->ddt_repair_tree
;
1014 if (spa_sync_pass(spa
) > 1)
1018 for (rdde
= avl_first(t
); rdde
!= NULL
; rdde
= rdde_next
) {
1019 rdde_next
= AVL_NEXT(t
, rdde
);
1020 avl_remove(&ddt
->ddt_repair_tree
, rdde
);
1022 ddt_bp_create(ddt
->ddt_checksum
, &rdde
->dde_key
, NULL
, &blk
);
1023 dde
= ddt_repair_start(ddt
, &blk
);
1024 ddt_repair_entry(ddt
, dde
, rdde
, rio
);
1025 ddt_repair_done(ddt
, dde
);
1032 ddt_sync_entry(ddt_t
*ddt
, ddt_entry_t
*dde
, dmu_tx_t
*tx
, uint64_t txg
)
1034 dsl_pool_t
*dp
= ddt
->ddt_spa
->spa_dsl_pool
;
1035 ddt_phys_t
*ddp
= dde
->dde_phys
;
1036 ddt_key_t
*ddk
= &dde
->dde_key
;
1037 enum ddt_type otype
= dde
->dde_type
;
1038 enum ddt_type ntype
= DDT_TYPE_CURRENT
;
1039 enum ddt_class oclass
= dde
->dde_class
;
1040 enum ddt_class nclass
;
1041 uint64_t total_refcnt
= 0;
1044 ASSERT(dde
->dde_loaded
);
1045 ASSERT(!dde
->dde_loading
);
1047 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++) {
1048 ASSERT(dde
->dde_lead_zio
[p
] == NULL
);
1049 ASSERT((int64_t)ddp
->ddp_refcnt
>= 0);
1050 if (ddp
->ddp_phys_birth
== 0) {
1051 ASSERT(ddp
->ddp_refcnt
== 0);
1054 if (p
== DDT_PHYS_DITTO
) {
1055 if (ddt_ditto_copies_needed(ddt
, dde
, NULL
) == 0)
1056 ddt_phys_free(ddt
, ddk
, ddp
, txg
);
1059 if (ddp
->ddp_refcnt
== 0)
1060 ddt_phys_free(ddt
, ddk
, ddp
, txg
);
1061 total_refcnt
+= ddp
->ddp_refcnt
;
1064 if (dde
->dde_phys
[DDT_PHYS_DITTO
].ddp_phys_birth
!= 0)
1065 nclass
= DDT_CLASS_DITTO
;
1066 else if (total_refcnt
> 1)
1067 nclass
= DDT_CLASS_DUPLICATE
;
1069 nclass
= DDT_CLASS_UNIQUE
;
1071 if (otype
!= DDT_TYPES
&&
1072 (otype
!= ntype
|| oclass
!= nclass
|| total_refcnt
== 0)) {
1073 VERIFY(ddt_object_remove(ddt
, otype
, oclass
, dde
, tx
) == 0);
1074 ASSERT(ddt_object_lookup(ddt
, otype
, oclass
, dde
) == ENOENT
);
1077 if (total_refcnt
!= 0) {
1078 dde
->dde_type
= ntype
;
1079 dde
->dde_class
= nclass
;
1080 ddt_stat_update(ddt
, dde
, 0);
1081 if (!ddt_object_exists(ddt
, ntype
, nclass
))
1082 ddt_object_create(ddt
, ntype
, nclass
, tx
);
1083 VERIFY(ddt_object_update(ddt
, ntype
, nclass
, dde
, tx
) == 0);
1086 * If the class changes, the order that we scan this bp
1087 * changes. If it decreases, we could miss it, so
1088 * scan it right now. (This covers both class changing
1089 * while we are doing ddt_walk(), and when we are
1092 if (nclass
< oclass
) {
1093 dsl_scan_ddt_entry(dp
->dp_scan
,
1094 ddt
->ddt_checksum
, dde
, tx
);
1100 ddt_sync_table(ddt_t
*ddt
, dmu_tx_t
*tx
, uint64_t txg
)
1102 spa_t
*spa
= ddt
->ddt_spa
;
1104 void *cookie
= NULL
;
1106 enum ddt_class
class;
1108 if (avl_numnodes(&ddt
->ddt_tree
) == 0)
1111 ASSERT(spa
->spa_uberblock
.ub_version
>= SPA_VERSION_DEDUP
);
1113 if (spa
->spa_ddt_stat_object
== 0) {
1114 spa
->spa_ddt_stat_object
= zap_create(ddt
->ddt_os
,
1115 DMU_OT_DDT_STATS
, DMU_OT_NONE
, 0, tx
);
1116 VERIFY(zap_add(ddt
->ddt_os
, DMU_POOL_DIRECTORY_OBJECT
,
1117 DMU_POOL_DDT_STATS
, sizeof (uint64_t), 1,
1118 &spa
->spa_ddt_stat_object
, tx
) == 0);
1121 while ((dde
= avl_destroy_nodes(&ddt
->ddt_tree
, &cookie
)) != NULL
) {
1122 ddt_sync_entry(ddt
, dde
, tx
, txg
);
1126 for (type
= 0; type
< DDT_TYPES
; type
++) {
1128 for (class = 0; class < DDT_CLASSES
; class++) {
1129 if (ddt_object_exists(ddt
, type
, class)) {
1130 ddt_object_sync(ddt
, type
, class, tx
);
1131 count
+= ddt_object_count(ddt
, type
, class);
1134 for (class = 0; class < DDT_CLASSES
; class++) {
1135 if (count
== 0 && ddt_object_exists(ddt
, type
, class))
1136 ddt_object_destroy(ddt
, type
, class, tx
);
1140 bcopy(ddt
->ddt_histogram
, &ddt
->ddt_histogram_cache
,
1141 sizeof (ddt
->ddt_histogram
));
1145 ddt_sync(spa_t
*spa
, uint64_t txg
)
1148 zio_t
*rio
= zio_root(spa
, NULL
, NULL
,
1149 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
);
1150 enum zio_checksum c
;
1152 ASSERT(spa_syncing_txg(spa
) == txg
);
1154 tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, txg
);
1156 for (c
= 0; c
< ZIO_CHECKSUM_FUNCTIONS
; c
++) {
1157 ddt_t
*ddt
= spa
->spa_ddt
[c
];
1160 ddt_sync_table(ddt
, tx
, txg
);
1161 ddt_repair_table(ddt
, rio
);
1164 (void) zio_wait(rio
);
1170 ddt_walk(spa_t
*spa
, ddt_bookmark_t
*ddb
, ddt_entry_t
*dde
)
1175 ddt_t
*ddt
= spa
->spa_ddt
[ddb
->ddb_checksum
];
1177 if (ddt_object_exists(ddt
, ddb
->ddb_type
,
1179 error
= ddt_object_walk(ddt
,
1180 ddb
->ddb_type
, ddb
->ddb_class
,
1181 &ddb
->ddb_cursor
, dde
);
1183 dde
->dde_type
= ddb
->ddb_type
;
1184 dde
->dde_class
= ddb
->ddb_class
;
1187 if (error
!= ENOENT
)
1189 ddb
->ddb_cursor
= 0;
1190 } while (++ddb
->ddb_checksum
< ZIO_CHECKSUM_FUNCTIONS
);
1191 ddb
->ddb_checksum
= 0;
1192 } while (++ddb
->ddb_type
< DDT_TYPES
);
1194 } while (++ddb
->ddb_class
< DDT_CLASSES
);
1199 #if defined(_KERNEL) && defined(HAVE_SPL)
1200 module_param(zfs_dedup_prefetch
, int, 0644);
1201 MODULE_PARM_DESC(zfs_dedup_prefetch
,"Enable prefetching dedup-ed blks");