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 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>
41 * Enable/disable prefetching of dedup-ed blocks which are going to be freed.
43 int zfs_dedup_prefetch = 1;
45 SYSCTL_DECL(_vfs_zfs);
46 SYSCTL_NODE(_vfs_zfs, OID_AUTO, dedup, CTLFLAG_RW, 0, "ZFS DEDUP");
47 TUNABLE_INT("vfs.zfs.dedup.prefetch", &zfs_dedup_prefetch);
48 SYSCTL_INT(_vfs_zfs_dedup, OID_AUTO, prefetch, CTLFLAG_RW, &zfs_dedup_prefetch,
49 0, "Enable/disable prefetching of dedup-ed blocks which are going to be freed");
51 static const ddt_ops_t *ddt_ops[DDT_TYPES] = {
55 static const char *ddt_class_name[DDT_CLASSES] = {
62 ddt_object_create(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
65 spa_t *spa = ddt->ddt_spa;
66 objset_t *os = ddt->ddt_os;
67 uint64_t *objectp = &ddt->ddt_object[type][class];
68 boolean_t prehash = zio_checksum_table[ddt->ddt_checksum].ci_dedup;
69 char name[DDT_NAMELEN];
71 ddt_object_name(ddt, type, class, name);
73 ASSERT(*objectp == 0);
74 VERIFY(ddt_ops[type]->ddt_op_create(os, objectp, tx, prehash) == 0);
75 ASSERT(*objectp != 0);
77 VERIFY(zap_add(os, DMU_POOL_DIRECTORY_OBJECT, name,
78 sizeof (uint64_t), 1, objectp, tx) == 0);
80 VERIFY(zap_add(os, spa->spa_ddt_stat_object, name,
81 sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t),
82 &ddt->ddt_histogram[type][class], tx) == 0);
86 ddt_object_destroy(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
89 spa_t *spa = ddt->ddt_spa;
90 objset_t *os = ddt->ddt_os;
91 uint64_t *objectp = &ddt->ddt_object[type][class];
92 char name[DDT_NAMELEN];
94 ddt_object_name(ddt, type, class, name);
96 ASSERT(*objectp != 0);
97 ASSERT(ddt_object_count(ddt, type, class) == 0);
98 ASSERT(ddt_histogram_empty(&ddt->ddt_histogram[type][class]));
99 VERIFY(zap_remove(os, DMU_POOL_DIRECTORY_OBJECT, name, tx) == 0);
100 VERIFY(zap_remove(os, spa->spa_ddt_stat_object, name, tx) == 0);
101 VERIFY(ddt_ops[type]->ddt_op_destroy(os, *objectp, tx) == 0);
102 bzero(&ddt->ddt_object_stats[type][class], sizeof (ddt_object_t));
108 ddt_object_load(ddt_t *ddt, enum ddt_type type, enum ddt_class class)
110 ddt_object_t *ddo = &ddt->ddt_object_stats[type][class];
111 dmu_object_info_t doi;
112 char name[DDT_NAMELEN];
115 ddt_object_name(ddt, type, class, name);
117 error = zap_lookup(ddt->ddt_os, DMU_POOL_DIRECTORY_OBJECT, name,
118 sizeof (uint64_t), 1, &ddt->ddt_object[type][class]);
123 error = zap_lookup(ddt->ddt_os, ddt->ddt_spa->spa_ddt_stat_object, name,
124 sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t),
125 &ddt->ddt_histogram[type][class]);
128 * Seed the cached statistics.
130 VERIFY(ddt_object_info(ddt, type, class, &doi) == 0);
132 ddo->ddo_count = ddt_object_count(ddt, type, class);
133 ddo->ddo_dspace = doi.doi_physical_blocks_512 << 9;
134 ddo->ddo_mspace = doi.doi_fill_count * doi.doi_data_block_size;
141 ddt_object_sync(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
144 ddt_object_t *ddo = &ddt->ddt_object_stats[type][class];
145 dmu_object_info_t doi;
146 char name[DDT_NAMELEN];
148 ddt_object_name(ddt, type, class, name);
150 VERIFY(zap_update(ddt->ddt_os, ddt->ddt_spa->spa_ddt_stat_object, name,
151 sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t),
152 &ddt->ddt_histogram[type][class], tx) == 0);
155 * Cache DDT statistics; this is the only time they'll change.
157 VERIFY(ddt_object_info(ddt, type, class, &doi) == 0);
159 ddo->ddo_count = ddt_object_count(ddt, type, class);
160 ddo->ddo_dspace = doi.doi_physical_blocks_512 << 9;
161 ddo->ddo_mspace = doi.doi_fill_count * doi.doi_data_block_size;
165 ddt_object_lookup(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
168 if (!ddt_object_exists(ddt, type, class))
171 return (ddt_ops[type]->ddt_op_lookup(ddt->ddt_os,
172 ddt->ddt_object[type][class], dde));
176 ddt_object_prefetch(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
179 if (!ddt_object_exists(ddt, type, class))
182 ddt_ops[type]->ddt_op_prefetch(ddt->ddt_os,
183 ddt->ddt_object[type][class], dde);
187 ddt_object_update(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
188 ddt_entry_t *dde, dmu_tx_t *tx)
190 ASSERT(ddt_object_exists(ddt, type, class));
192 return (ddt_ops[type]->ddt_op_update(ddt->ddt_os,
193 ddt->ddt_object[type][class], dde, tx));
197 ddt_object_remove(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
198 ddt_entry_t *dde, dmu_tx_t *tx)
200 ASSERT(ddt_object_exists(ddt, type, class));
202 return (ddt_ops[type]->ddt_op_remove(ddt->ddt_os,
203 ddt->ddt_object[type][class], dde, tx));
207 ddt_object_walk(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
208 uint64_t *walk, ddt_entry_t *dde)
210 ASSERT(ddt_object_exists(ddt, type, class));
212 return (ddt_ops[type]->ddt_op_walk(ddt->ddt_os,
213 ddt->ddt_object[type][class], dde, walk));
217 ddt_object_count(ddt_t *ddt, enum ddt_type type, enum ddt_class class)
219 ASSERT(ddt_object_exists(ddt, type, class));
221 return (ddt_ops[type]->ddt_op_count(ddt->ddt_os,
222 ddt->ddt_object[type][class]));
226 ddt_object_info(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
227 dmu_object_info_t *doi)
229 if (!ddt_object_exists(ddt, type, class))
232 return (dmu_object_info(ddt->ddt_os, ddt->ddt_object[type][class],
237 ddt_object_exists(ddt_t *ddt, enum ddt_type type, enum ddt_class class)
239 return (!!ddt->ddt_object[type][class]);
243 ddt_object_name(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
246 (void) sprintf(name, DMU_POOL_DDT,
247 zio_checksum_table[ddt->ddt_checksum].ci_name,
248 ddt_ops[type]->ddt_op_name, ddt_class_name[class]);
252 ddt_bp_fill(const ddt_phys_t *ddp, blkptr_t *bp, uint64_t txg)
256 for (int d = 0; d < SPA_DVAS_PER_BP; d++)
257 bp->blk_dva[d] = ddp->ddp_dva[d];
258 BP_SET_BIRTH(bp, txg, ddp->ddp_phys_birth);
262 ddt_bp_create(enum zio_checksum checksum,
263 const ddt_key_t *ddk, const ddt_phys_t *ddp, blkptr_t *bp)
268 ddt_bp_fill(ddp, bp, ddp->ddp_phys_birth);
270 bp->blk_cksum = ddk->ddk_cksum;
273 BP_SET_LSIZE(bp, DDK_GET_LSIZE(ddk));
274 BP_SET_PSIZE(bp, DDK_GET_PSIZE(ddk));
275 BP_SET_COMPRESS(bp, DDK_GET_COMPRESS(ddk));
276 BP_SET_CHECKSUM(bp, checksum);
277 BP_SET_TYPE(bp, DMU_OT_DEDUP);
280 BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER);
284 ddt_key_fill(ddt_key_t *ddk, const blkptr_t *bp)
286 ddk->ddk_cksum = bp->blk_cksum;
289 DDK_SET_LSIZE(ddk, BP_GET_LSIZE(bp));
290 DDK_SET_PSIZE(ddk, BP_GET_PSIZE(bp));
291 DDK_SET_COMPRESS(ddk, BP_GET_COMPRESS(bp));
295 ddt_phys_fill(ddt_phys_t *ddp, const blkptr_t *bp)
297 ASSERT(ddp->ddp_phys_birth == 0);
299 for (int d = 0; d < SPA_DVAS_PER_BP; d++)
300 ddp->ddp_dva[d] = bp->blk_dva[d];
301 ddp->ddp_phys_birth = BP_PHYSICAL_BIRTH(bp);
305 ddt_phys_clear(ddt_phys_t *ddp)
307 bzero(ddp, sizeof (*ddp));
311 ddt_phys_addref(ddt_phys_t *ddp)
317 ddt_phys_decref(ddt_phys_t *ddp)
319 ASSERT((int64_t)ddp->ddp_refcnt > 0);
324 ddt_phys_free(ddt_t *ddt, ddt_key_t *ddk, ddt_phys_t *ddp, uint64_t txg)
328 ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk);
330 zio_free(ddt->ddt_spa, txg, &blk);
334 ddt_phys_select(const ddt_entry_t *dde, const blkptr_t *bp)
336 ddt_phys_t *ddp = (ddt_phys_t *)dde->dde_phys;
338 for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
339 if (DVA_EQUAL(BP_IDENTITY(bp), &ddp->ddp_dva[0]) &&
340 BP_PHYSICAL_BIRTH(bp) == ddp->ddp_phys_birth)
347 ddt_phys_total_refcnt(const ddt_entry_t *dde)
351 for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++)
352 refcnt += dde->dde_phys[p].ddp_refcnt;
358 ddt_stat_generate(ddt_t *ddt, ddt_entry_t *dde, ddt_stat_t *dds)
360 spa_t *spa = ddt->ddt_spa;
361 ddt_phys_t *ddp = dde->dde_phys;
362 ddt_key_t *ddk = &dde->dde_key;
363 uint64_t lsize = DDK_GET_LSIZE(ddk);
364 uint64_t psize = DDK_GET_PSIZE(ddk);
366 bzero(dds, sizeof (*dds));
368 for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
370 uint64_t refcnt = ddp->ddp_refcnt;
372 if (ddp->ddp_phys_birth == 0)
375 for (int 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)
423 for (int h = 0; h < 64; h++)
424 ddt_stat_add(&dst->ddh_stat[h], &src->ddh_stat[h], 0);
428 ddt_histogram_stat(ddt_stat_t *dds, const ddt_histogram_t *ddh)
430 bzero(dds, sizeof (*dds));
432 for (int h = 0; h < 64; h++)
433 ddt_stat_add(dds, &ddh->ddh_stat[h], 0);
437 ddt_histogram_empty(const ddt_histogram_t *ddh)
439 const uint64_t *s = (const uint64_t *)ddh;
440 const uint64_t *s_end = (const uint64_t *)(ddh + 1);
450 ddt_get_dedup_object_stats(spa_t *spa, ddt_object_t *ddo_total)
452 /* Sum the statistics we cached in ddt_object_sync(). */
453 for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
454 ddt_t *ddt = spa->spa_ddt[c];
455 for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
456 for (enum ddt_class class = 0; class < DDT_CLASSES;
459 &ddt->ddt_object_stats[type][class];
460 ddo_total->ddo_count += ddo->ddo_count;
461 ddo_total->ddo_dspace += ddo->ddo_dspace;
462 ddo_total->ddo_mspace += ddo->ddo_mspace;
467 /* ... and compute the averages. */
468 if (ddo_total->ddo_count != 0) {
469 ddo_total->ddo_dspace /= ddo_total->ddo_count;
470 ddo_total->ddo_mspace /= ddo_total->ddo_count;
475 ddt_get_dedup_histogram(spa_t *spa, ddt_histogram_t *ddh)
477 for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
478 ddt_t *ddt = spa->spa_ddt[c];
479 for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
480 for (enum ddt_class class = 0; class < DDT_CLASSES;
482 ddt_histogram_add(ddh,
483 &ddt->ddt_histogram_cache[type][class]);
490 ddt_get_dedup_stats(spa_t *spa, ddt_stat_t *dds_total)
492 ddt_histogram_t *ddh_total;
494 ddh_total = kmem_zalloc(sizeof (ddt_histogram_t), KM_SLEEP);
495 ddt_get_dedup_histogram(spa, ddh_total);
496 ddt_histogram_stat(dds_total, ddh_total);
497 kmem_free(ddh_total, sizeof (ddt_histogram_t));
501 ddt_get_dedup_dspace(spa_t *spa)
503 ddt_stat_t dds_total = { 0 };
505 ddt_get_dedup_stats(spa, &dds_total);
506 return (dds_total.dds_ref_dsize - dds_total.dds_dsize);
510 ddt_get_pool_dedup_ratio(spa_t *spa)
512 ddt_stat_t dds_total = { 0 };
514 ddt_get_dedup_stats(spa, &dds_total);
515 if (dds_total.dds_dsize == 0)
518 return (dds_total.dds_ref_dsize * 100 / dds_total.dds_dsize);
522 ddt_ditto_copies_needed(ddt_t *ddt, ddt_entry_t *dde, ddt_phys_t *ddp_willref)
524 spa_t *spa = ddt->ddt_spa;
525 uint64_t total_refcnt = 0;
526 uint64_t ditto = spa->spa_dedup_ditto;
527 int total_copies = 0;
528 int desired_copies = 0;
530 for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) {
531 ddt_phys_t *ddp = &dde->dde_phys[p];
532 zio_t *zio = dde->dde_lead_zio[p];
533 uint64_t refcnt = ddp->ddp_refcnt; /* committed refs */
535 refcnt += zio->io_parent_count; /* pending refs */
536 if (ddp == ddp_willref)
537 refcnt++; /* caller's ref */
539 total_refcnt += refcnt;
544 if (ditto == 0 || ditto > UINT32_MAX)
547 if (total_refcnt >= 1)
549 if (total_refcnt >= ditto)
551 if (total_refcnt >= ditto * ditto)
554 return (MAX(desired_copies, total_copies) - total_copies);
558 ddt_ditto_copies_present(ddt_entry_t *dde)
560 ddt_phys_t *ddp = &dde->dde_phys[DDT_PHYS_DITTO];
561 dva_t *dva = ddp->ddp_dva;
562 int copies = 0 - DVA_GET_GANG(dva);
564 for (int d = 0; d < SPA_DVAS_PER_BP; d++, dva++)
565 if (DVA_IS_VALID(dva))
568 ASSERT(copies >= 0 && copies < SPA_DVAS_PER_BP);
574 ddt_compress(void *src, uchar_t *dst, size_t s_len, size_t d_len)
576 uchar_t *version = dst++;
577 int cpfunc = ZIO_COMPRESS_ZLE;
578 zio_compress_info_t *ci = &zio_compress_table[cpfunc];
581 ASSERT(d_len >= s_len + 1); /* no compression plus version byte */
583 c_len = ci->ci_compress(src, dst, s_len, d_len - 1, ci->ci_level);
585 if (c_len == s_len) {
586 cpfunc = ZIO_COMPRESS_OFF;
587 bcopy(src, dst, s_len);
590 *version = (ZFS_HOST_BYTEORDER & DDT_COMPRESS_BYTEORDER_MASK) | cpfunc;
596 ddt_decompress(uchar_t *src, void *dst, size_t s_len, size_t d_len)
598 uchar_t version = *src++;
599 int cpfunc = version & DDT_COMPRESS_FUNCTION_MASK;
600 zio_compress_info_t *ci = &zio_compress_table[cpfunc];
602 if (ci->ci_decompress != NULL)
603 (void) ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level);
605 bcopy(src, dst, d_len);
607 if ((version ^ ZFS_HOST_BYTEORDER) & DDT_COMPRESS_BYTEORDER_MASK)
608 byteswap_uint64_array(dst, d_len);
612 ddt_select_by_checksum(spa_t *spa, enum zio_checksum c)
614 return (spa->spa_ddt[c]);
618 ddt_select(spa_t *spa, const blkptr_t *bp)
620 return (spa->spa_ddt[BP_GET_CHECKSUM(bp)]);
624 ddt_enter(ddt_t *ddt)
626 mutex_enter(&ddt->ddt_lock);
632 mutex_exit(&ddt->ddt_lock);
636 ddt_alloc(const ddt_key_t *ddk)
640 dde = kmem_zalloc(sizeof (ddt_entry_t), KM_SLEEP);
641 cv_init(&dde->dde_cv, NULL, CV_DEFAULT, NULL);
649 ddt_free(ddt_entry_t *dde)
651 ASSERT(!dde->dde_loading);
653 for (int p = 0; p < DDT_PHYS_TYPES; p++)
654 ASSERT(dde->dde_lead_zio[p] == NULL);
656 if (dde->dde_repair_data != NULL)
657 zio_buf_free(dde->dde_repair_data,
658 DDK_GET_PSIZE(&dde->dde_key));
660 cv_destroy(&dde->dde_cv);
661 kmem_free(dde, sizeof (*dde));
665 ddt_remove(ddt_t *ddt, ddt_entry_t *dde)
667 ASSERT(MUTEX_HELD(&ddt->ddt_lock));
669 avl_remove(&ddt->ddt_tree, dde);
674 ddt_lookup(ddt_t *ddt, const blkptr_t *bp, boolean_t add)
676 ddt_entry_t *dde, dde_search;
678 enum ddt_class class;
682 ASSERT(MUTEX_HELD(&ddt->ddt_lock));
684 ddt_key_fill(&dde_search.dde_key, bp);
686 dde = avl_find(&ddt->ddt_tree, &dde_search, &where);
690 dde = ddt_alloc(&dde_search.dde_key);
691 avl_insert(&ddt->ddt_tree, dde, where);
694 while (dde->dde_loading)
695 cv_wait(&dde->dde_cv, &ddt->ddt_lock);
700 dde->dde_loading = B_TRUE;
706 for (type = 0; type < DDT_TYPES; type++) {
707 for (class = 0; class < DDT_CLASSES; class++) {
708 error = ddt_object_lookup(ddt, type, class, dde);
716 ASSERT(error == 0 || error == ENOENT);
720 ASSERT(dde->dde_loaded == B_FALSE);
721 ASSERT(dde->dde_loading == B_TRUE);
723 dde->dde_type = type; /* will be DDT_TYPES if no entry found */
724 dde->dde_class = class; /* will be DDT_CLASSES if no entry found */
725 dde->dde_loaded = B_TRUE;
726 dde->dde_loading = B_FALSE;
729 ddt_stat_update(ddt, dde, -1ULL);
731 cv_broadcast(&dde->dde_cv);
737 ddt_prefetch(spa_t *spa, const blkptr_t *bp)
742 if (!zfs_dedup_prefetch || bp == NULL || !BP_GET_DEDUP(bp))
746 * We only remove the DDT once all tables are empty and only
747 * prefetch dedup blocks when there are entries in the DDT.
748 * Thus no locking is required as the DDT can't disappear on us.
750 ddt = ddt_select(spa, bp);
751 ddt_key_fill(&dde.dde_key, bp);
753 for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
754 for (enum ddt_class class = 0; class < DDT_CLASSES; class++) {
755 ddt_object_prefetch(ddt, type, class, &dde);
761 ddt_entry_compare(const void *x1, const void *x2)
763 const ddt_entry_t *dde1 = x1;
764 const ddt_entry_t *dde2 = x2;
765 const uint64_t *u1 = (const uint64_t *)&dde1->dde_key;
766 const uint64_t *u2 = (const uint64_t *)&dde2->dde_key;
768 for (int i = 0; i < DDT_KEY_WORDS; i++) {
779 ddt_table_alloc(spa_t *spa, enum zio_checksum c)
783 ddt = kmem_zalloc(sizeof (*ddt), KM_SLEEP);
785 mutex_init(&ddt->ddt_lock, NULL, MUTEX_DEFAULT, NULL);
786 avl_create(&ddt->ddt_tree, ddt_entry_compare,
787 sizeof (ddt_entry_t), offsetof(ddt_entry_t, dde_node));
788 avl_create(&ddt->ddt_repair_tree, ddt_entry_compare,
789 sizeof (ddt_entry_t), offsetof(ddt_entry_t, dde_node));
790 ddt->ddt_checksum = c;
792 ddt->ddt_os = spa->spa_meta_objset;
798 ddt_table_free(ddt_t *ddt)
800 ASSERT(avl_numnodes(&ddt->ddt_tree) == 0);
801 ASSERT(avl_numnodes(&ddt->ddt_repair_tree) == 0);
802 avl_destroy(&ddt->ddt_tree);
803 avl_destroy(&ddt->ddt_repair_tree);
804 mutex_destroy(&ddt->ddt_lock);
805 kmem_free(ddt, sizeof (*ddt));
809 ddt_create(spa_t *spa)
811 spa->spa_dedup_checksum = ZIO_DEDUPCHECKSUM;
813 for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++)
814 spa->spa_ddt[c] = ddt_table_alloc(spa, c);
824 error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
825 DMU_POOL_DDT_STATS, sizeof (uint64_t), 1,
826 &spa->spa_ddt_stat_object);
829 return (error == ENOENT ? 0 : error);
831 for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
832 ddt_t *ddt = spa->spa_ddt[c];
833 for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
834 for (enum ddt_class class = 0; class < DDT_CLASSES;
836 error = ddt_object_load(ddt, type, class);
837 if (error != 0 && error != ENOENT)
843 * Seed the cached histograms.
845 bcopy(ddt->ddt_histogram, &ddt->ddt_histogram_cache,
846 sizeof (ddt->ddt_histogram));
853 ddt_unload(spa_t *spa)
855 for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
856 if (spa->spa_ddt[c]) {
857 ddt_table_free(spa->spa_ddt[c]);
858 spa->spa_ddt[c] = NULL;
864 ddt_class_contains(spa_t *spa, enum ddt_class max_class, const blkptr_t *bp)
869 if (!BP_GET_DEDUP(bp))
872 if (max_class == DDT_CLASS_UNIQUE)
875 ddt = spa->spa_ddt[BP_GET_CHECKSUM(bp)];
877 ddt_key_fill(&dde.dde_key, bp);
879 for (enum ddt_type type = 0; type < DDT_TYPES; type++)
880 for (enum ddt_class class = 0; class <= max_class; class++)
881 if (ddt_object_lookup(ddt, type, class, &dde) == 0)
888 ddt_repair_start(ddt_t *ddt, const blkptr_t *bp)
893 ddt_key_fill(&ddk, bp);
895 dde = ddt_alloc(&ddk);
897 for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
898 for (enum ddt_class class = 0; class < DDT_CLASSES; class++) {
900 * We can only do repair if there are multiple copies
901 * of the block. For anything in the UNIQUE class,
902 * there's definitely only one copy, so don't even try.
904 if (class != DDT_CLASS_UNIQUE &&
905 ddt_object_lookup(ddt, type, class, dde) == 0)
910 bzero(dde->dde_phys, sizeof (dde->dde_phys));
916 ddt_repair_done(ddt_t *ddt, ddt_entry_t *dde)
922 if (dde->dde_repair_data != NULL && spa_writeable(ddt->ddt_spa) &&
923 avl_find(&ddt->ddt_repair_tree, dde, &where) == NULL)
924 avl_insert(&ddt->ddt_repair_tree, dde, where);
932 ddt_repair_entry_done(zio_t *zio)
934 ddt_entry_t *rdde = zio->io_private;
940 ddt_repair_entry(ddt_t *ddt, ddt_entry_t *dde, ddt_entry_t *rdde, zio_t *rio)
942 ddt_phys_t *ddp = dde->dde_phys;
943 ddt_phys_t *rddp = rdde->dde_phys;
944 ddt_key_t *ddk = &dde->dde_key;
945 ddt_key_t *rddk = &rdde->dde_key;
949 zio = zio_null(rio, rio->io_spa, NULL,
950 ddt_repair_entry_done, rdde, rio->io_flags);
952 for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++, rddp++) {
953 if (ddp->ddp_phys_birth == 0 ||
954 ddp->ddp_phys_birth != rddp->ddp_phys_birth ||
955 bcmp(ddp->ddp_dva, rddp->ddp_dva, sizeof (ddp->ddp_dva)))
957 ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk);
958 zio_nowait(zio_rewrite(zio, zio->io_spa, 0, &blk,
959 rdde->dde_repair_data, DDK_GET_PSIZE(rddk), NULL, NULL,
960 ZIO_PRIORITY_SYNC_WRITE, ZIO_DDT_CHILD_FLAGS(zio), NULL));
967 ddt_repair_table(ddt_t *ddt, zio_t *rio)
969 spa_t *spa = ddt->ddt_spa;
970 ddt_entry_t *dde, *rdde_next, *rdde;
971 avl_tree_t *t = &ddt->ddt_repair_tree;
974 if (spa_sync_pass(spa) > 1)
978 for (rdde = avl_first(t); rdde != NULL; rdde = rdde_next) {
979 rdde_next = AVL_NEXT(t, rdde);
980 avl_remove(&ddt->ddt_repair_tree, rdde);
982 ddt_bp_create(ddt->ddt_checksum, &rdde->dde_key, NULL, &blk);
983 dde = ddt_repair_start(ddt, &blk);
984 ddt_repair_entry(ddt, dde, rdde, rio);
985 ddt_repair_done(ddt, dde);
992 ddt_sync_entry(ddt_t *ddt, ddt_entry_t *dde, dmu_tx_t *tx, uint64_t txg)
994 dsl_pool_t *dp = ddt->ddt_spa->spa_dsl_pool;
995 ddt_phys_t *ddp = dde->dde_phys;
996 ddt_key_t *ddk = &dde->dde_key;
997 enum ddt_type otype = dde->dde_type;
998 enum ddt_type ntype = DDT_TYPE_CURRENT;
999 enum ddt_class oclass = dde->dde_class;
1000 enum ddt_class nclass;
1001 uint64_t total_refcnt = 0;
1003 ASSERT(dde->dde_loaded);
1004 ASSERT(!dde->dde_loading);
1006 for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
1007 ASSERT(dde->dde_lead_zio[p] == NULL);
1008 ASSERT((int64_t)ddp->ddp_refcnt >= 0);
1009 if (ddp->ddp_phys_birth == 0) {
1010 ASSERT(ddp->ddp_refcnt == 0);
1013 if (p == DDT_PHYS_DITTO) {
1014 if (ddt_ditto_copies_needed(ddt, dde, NULL) == 0)
1015 ddt_phys_free(ddt, ddk, ddp, txg);
1018 if (ddp->ddp_refcnt == 0)
1019 ddt_phys_free(ddt, ddk, ddp, txg);
1020 total_refcnt += ddp->ddp_refcnt;
1023 if (dde->dde_phys[DDT_PHYS_DITTO].ddp_phys_birth != 0)
1024 nclass = DDT_CLASS_DITTO;
1025 else if (total_refcnt > 1)
1026 nclass = DDT_CLASS_DUPLICATE;
1028 nclass = DDT_CLASS_UNIQUE;
1030 if (otype != DDT_TYPES &&
1031 (otype != ntype || oclass != nclass || total_refcnt == 0)) {
1032 VERIFY(ddt_object_remove(ddt, otype, oclass, dde, tx) == 0);
1033 ASSERT(ddt_object_lookup(ddt, otype, oclass, dde) == ENOENT);
1036 if (total_refcnt != 0) {
1037 dde->dde_type = ntype;
1038 dde->dde_class = nclass;
1039 ddt_stat_update(ddt, dde, 0);
1040 if (!ddt_object_exists(ddt, ntype, nclass))
1041 ddt_object_create(ddt, ntype, nclass, tx);
1042 VERIFY(ddt_object_update(ddt, ntype, nclass, dde, tx) == 0);
1045 * If the class changes, the order that we scan this bp
1046 * changes. If it decreases, we could miss it, so
1047 * scan it right now. (This covers both class changing
1048 * while we are doing ddt_walk(), and when we are
1051 if (nclass < oclass) {
1052 dsl_scan_ddt_entry(dp->dp_scan,
1053 ddt->ddt_checksum, dde, tx);
1059 ddt_sync_table(ddt_t *ddt, dmu_tx_t *tx, uint64_t txg)
1061 spa_t *spa = ddt->ddt_spa;
1063 void *cookie = NULL;
1065 if (avl_numnodes(&ddt->ddt_tree) == 0)
1068 ASSERT(spa->spa_uberblock.ub_version >= SPA_VERSION_DEDUP);
1070 if (spa->spa_ddt_stat_object == 0) {
1071 spa->spa_ddt_stat_object = zap_create_link(ddt->ddt_os,
1072 DMU_OT_DDT_STATS, DMU_POOL_DIRECTORY_OBJECT,
1073 DMU_POOL_DDT_STATS, tx);
1076 while ((dde = avl_destroy_nodes(&ddt->ddt_tree, &cookie)) != NULL) {
1077 ddt_sync_entry(ddt, dde, tx, txg);
1081 for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
1083 for (enum ddt_class class = 0; class < DDT_CLASSES; class++) {
1084 if (ddt_object_exists(ddt, type, class)) {
1085 ddt_object_sync(ddt, type, class, tx);
1086 count += ddt_object_count(ddt, type, class);
1089 for (enum ddt_class class = 0; class < DDT_CLASSES; class++) {
1090 if (count == 0 && ddt_object_exists(ddt, type, class))
1091 ddt_object_destroy(ddt, type, class, tx);
1095 bcopy(ddt->ddt_histogram, &ddt->ddt_histogram_cache,
1096 sizeof (ddt->ddt_histogram));
1100 ddt_sync(spa_t *spa, uint64_t txg)
1103 zio_t *rio = zio_root(spa, NULL, NULL,
1104 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE);
1106 ASSERT(spa_syncing_txg(spa) == txg);
1108 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
1110 for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
1111 ddt_t *ddt = spa->spa_ddt[c];
1114 ddt_sync_table(ddt, tx, txg);
1115 ddt_repair_table(ddt, rio);
1118 (void) zio_wait(rio);
1124 ddt_walk(spa_t *spa, ddt_bookmark_t *ddb, ddt_entry_t *dde)
1129 ddt_t *ddt = spa->spa_ddt[ddb->ddb_checksum];
1131 if (ddt_object_exists(ddt, ddb->ddb_type,
1133 error = ddt_object_walk(ddt,
1134 ddb->ddb_type, ddb->ddb_class,
1135 &ddb->ddb_cursor, dde);
1137 dde->dde_type = ddb->ddb_type;
1138 dde->dde_class = ddb->ddb_class;
1141 if (error != ENOENT)
1143 ddb->ddb_cursor = 0;
1144 } while (++ddb->ddb_checksum < ZIO_CHECKSUM_FUNCTIONS);
1145 ddb->ddb_checksum = 0;
1146 } while (++ddb->ddb_type < DDT_TYPES);
1148 } while (++ddb->ddb_class < DDT_CLASSES);