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 SYSCTL_DECL(_vfs_zfs);
45 SYSCTL_NODE(_vfs_zfs, OID_AUTO, dedup, CTLFLAG_RW, 0, "ZFS DEDUP");
46 TUNABLE_INT("vfs.zfs.dedup.prefetch", &zfs_dedup_prefetch);
47 SYSCTL_INT(_vfs_zfs_dedup, OID_AUTO, prefetch, CTLFLAG_RW, &zfs_dedup_prefetch,
48 0, "Enable/disable prefetching of dedup-ed blocks which are going to be freed");
50 static const ddt_ops_t *ddt_ops[DDT_TYPES] = {
54 static const char *ddt_class_name[DDT_CLASSES] = {
61 ddt_object_create(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
64 spa_t *spa = ddt->ddt_spa;
65 objset_t *os = ddt->ddt_os;
66 uint64_t *objectp = &ddt->ddt_object[type][class];
67 boolean_t prehash = zio_checksum_table[ddt->ddt_checksum].ci_dedup;
68 char name[DDT_NAMELEN];
70 ddt_object_name(ddt, type, class, name);
72 ASSERT(*objectp == 0);
73 VERIFY(ddt_ops[type]->ddt_op_create(os, objectp, tx, prehash) == 0);
74 ASSERT(*objectp != 0);
76 VERIFY(zap_add(os, DMU_POOL_DIRECTORY_OBJECT, name,
77 sizeof (uint64_t), 1, objectp, tx) == 0);
79 VERIFY(zap_add(os, spa->spa_ddt_stat_object, name,
80 sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t),
81 &ddt->ddt_histogram[type][class], tx) == 0);
85 ddt_object_destroy(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
88 spa_t *spa = ddt->ddt_spa;
89 objset_t *os = ddt->ddt_os;
90 uint64_t *objectp = &ddt->ddt_object[type][class];
91 char name[DDT_NAMELEN];
93 ddt_object_name(ddt, type, class, name);
95 ASSERT(*objectp != 0);
96 ASSERT(ddt_object_count(ddt, type, class) == 0);
97 ASSERT(ddt_histogram_empty(&ddt->ddt_histogram[type][class]));
98 VERIFY(zap_remove(os, DMU_POOL_DIRECTORY_OBJECT, name, tx) == 0);
99 VERIFY(zap_remove(os, spa->spa_ddt_stat_object, name, tx) == 0);
100 VERIFY(ddt_ops[type]->ddt_op_destroy(os, *objectp, tx) == 0);
101 bzero(&ddt->ddt_object_stats[type][class], sizeof (ddt_object_t));
107 ddt_object_load(ddt_t *ddt, enum ddt_type type, enum ddt_class class)
109 ddt_object_t *ddo = &ddt->ddt_object_stats[type][class];
110 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 error = 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 VERIFY(ddt_object_info(ddt, type, class, &doi) == 0);
131 ddo->ddo_count = ddt_object_count(ddt, type, class);
132 ddo->ddo_dspace = doi.doi_physical_blocks_512 << 9;
133 ddo->ddo_mspace = doi.doi_fill_count * doi.doi_data_block_size;
140 ddt_object_sync(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
143 ddt_object_t *ddo = &ddt->ddt_object_stats[type][class];
144 dmu_object_info_t doi;
145 char name[DDT_NAMELEN];
147 ddt_object_name(ddt, type, class, name);
149 VERIFY(zap_update(ddt->ddt_os, ddt->ddt_spa->spa_ddt_stat_object, name,
150 sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t),
151 &ddt->ddt_histogram[type][class], tx) == 0);
154 * Cache DDT statistics; this is the only time they'll change.
156 VERIFY(ddt_object_info(ddt, type, class, &doi) == 0);
158 ddo->ddo_count = ddt_object_count(ddt, type, class);
159 ddo->ddo_dspace = doi.doi_physical_blocks_512 << 9;
160 ddo->ddo_mspace = doi.doi_fill_count * doi.doi_data_block_size;
164 ddt_object_lookup(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
167 if (!ddt_object_exists(ddt, type, class))
170 return (ddt_ops[type]->ddt_op_lookup(ddt->ddt_os,
171 ddt->ddt_object[type][class], dde));
175 ddt_object_prefetch(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
178 if (!ddt_object_exists(ddt, type, class))
181 ddt_ops[type]->ddt_op_prefetch(ddt->ddt_os,
182 ddt->ddt_object[type][class], dde);
186 ddt_object_update(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
187 ddt_entry_t *dde, dmu_tx_t *tx)
189 ASSERT(ddt_object_exists(ddt, type, class));
191 return (ddt_ops[type]->ddt_op_update(ddt->ddt_os,
192 ddt->ddt_object[type][class], dde, tx));
196 ddt_object_remove(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
197 ddt_entry_t *dde, dmu_tx_t *tx)
199 ASSERT(ddt_object_exists(ddt, type, class));
201 return (ddt_ops[type]->ddt_op_remove(ddt->ddt_os,
202 ddt->ddt_object[type][class], dde, tx));
206 ddt_object_walk(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
207 uint64_t *walk, ddt_entry_t *dde)
209 ASSERT(ddt_object_exists(ddt, type, class));
211 return (ddt_ops[type]->ddt_op_walk(ddt->ddt_os,
212 ddt->ddt_object[type][class], dde, walk));
216 ddt_object_count(ddt_t *ddt, enum ddt_type type, enum ddt_class class)
218 ASSERT(ddt_object_exists(ddt, type, class));
220 return (ddt_ops[type]->ddt_op_count(ddt->ddt_os,
221 ddt->ddt_object[type][class]));
225 ddt_object_info(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
226 dmu_object_info_t *doi)
228 if (!ddt_object_exists(ddt, type, class))
231 return (dmu_object_info(ddt->ddt_os, ddt->ddt_object[type][class],
236 ddt_object_exists(ddt_t *ddt, enum ddt_type type, enum ddt_class class)
238 return (!!ddt->ddt_object[type][class]);
242 ddt_object_name(ddt_t *ddt, enum ddt_type type, enum ddt_class class,
245 (void) sprintf(name, DMU_POOL_DDT,
246 zio_checksum_table[ddt->ddt_checksum].ci_name,
247 ddt_ops[type]->ddt_op_name, ddt_class_name[class]);
251 ddt_bp_fill(const ddt_phys_t *ddp, blkptr_t *bp, uint64_t txg)
255 for (int d = 0; d < SPA_DVAS_PER_BP; d++)
256 bp->blk_dva[d] = ddp->ddp_dva[d];
257 BP_SET_BIRTH(bp, txg, ddp->ddp_phys_birth);
261 ddt_bp_create(enum zio_checksum checksum,
262 const ddt_key_t *ddk, const ddt_phys_t *ddp, blkptr_t *bp)
267 ddt_bp_fill(ddp, bp, ddp->ddp_phys_birth);
269 bp->blk_cksum = ddk->ddk_cksum;
272 BP_SET_LSIZE(bp, DDK_GET_LSIZE(ddk));
273 BP_SET_PSIZE(bp, DDK_GET_PSIZE(ddk));
274 BP_SET_COMPRESS(bp, DDK_GET_COMPRESS(ddk));
275 BP_SET_CHECKSUM(bp, checksum);
276 BP_SET_TYPE(bp, DMU_OT_DEDUP);
279 BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER);
283 ddt_key_fill(ddt_key_t *ddk, const blkptr_t *bp)
285 ddk->ddk_cksum = bp->blk_cksum;
288 DDK_SET_LSIZE(ddk, BP_GET_LSIZE(bp));
289 DDK_SET_PSIZE(ddk, BP_GET_PSIZE(bp));
290 DDK_SET_COMPRESS(ddk, BP_GET_COMPRESS(bp));
294 ddt_phys_fill(ddt_phys_t *ddp, const blkptr_t *bp)
296 ASSERT(ddp->ddp_phys_birth == 0);
298 for (int d = 0; d < SPA_DVAS_PER_BP; d++)
299 ddp->ddp_dva[d] = bp->blk_dva[d];
300 ddp->ddp_phys_birth = BP_PHYSICAL_BIRTH(bp);
304 ddt_phys_clear(ddt_phys_t *ddp)
306 bzero(ddp, sizeof (*ddp));
310 ddt_phys_addref(ddt_phys_t *ddp)
316 ddt_phys_decref(ddt_phys_t *ddp)
318 ASSERT((int64_t)ddp->ddp_refcnt > 0);
323 ddt_phys_free(ddt_t *ddt, ddt_key_t *ddk, ddt_phys_t *ddp, uint64_t txg)
327 ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk);
329 zio_free(ddt->ddt_spa, txg, &blk);
333 ddt_phys_select(const ddt_entry_t *dde, const blkptr_t *bp)
335 ddt_phys_t *ddp = (ddt_phys_t *)dde->dde_phys;
337 for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
338 if (DVA_EQUAL(BP_IDENTITY(bp), &ddp->ddp_dva[0]) &&
339 BP_PHYSICAL_BIRTH(bp) == ddp->ddp_phys_birth)
346 ddt_phys_total_refcnt(const ddt_entry_t *dde)
350 for (int 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);
365 bzero(dds, sizeof (*dds));
367 for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
369 uint64_t refcnt = ddp->ddp_refcnt;
371 if (ddp->ddp_phys_birth == 0)
374 for (int d = 0; d < SPA_DVAS_PER_BP; d++)
375 dsize += dva_get_dsize_sync(spa, &ddp->ddp_dva[d]);
377 dds->dds_blocks += 1;
378 dds->dds_lsize += lsize;
379 dds->dds_psize += psize;
380 dds->dds_dsize += dsize;
382 dds->dds_ref_blocks += refcnt;
383 dds->dds_ref_lsize += lsize * refcnt;
384 dds->dds_ref_psize += psize * refcnt;
385 dds->dds_ref_dsize += dsize * refcnt;
390 ddt_stat_add(ddt_stat_t *dst, const ddt_stat_t *src, uint64_t neg)
392 const uint64_t *s = (const uint64_t *)src;
393 uint64_t *d = (uint64_t *)dst;
394 uint64_t *d_end = (uint64_t *)(dst + 1);
396 ASSERT(neg == 0 || neg == -1ULL); /* add or subtract */
399 *d++ += (*s++ ^ neg) - neg;
403 ddt_stat_update(ddt_t *ddt, ddt_entry_t *dde, uint64_t neg)
406 ddt_histogram_t *ddh;
409 ddt_stat_generate(ddt, dde, &dds);
411 bucket = highbit(dds.dds_ref_blocks) - 1;
414 ddh = &ddt->ddt_histogram[dde->dde_type][dde->dde_class];
416 ddt_stat_add(&ddh->ddh_stat[bucket], &dds, neg);
420 ddt_histogram_add(ddt_histogram_t *dst, const ddt_histogram_t *src)
422 for (int h = 0; h < 64; h++)
423 ddt_stat_add(&dst->ddh_stat[h], &src->ddh_stat[h], 0);
427 ddt_histogram_stat(ddt_stat_t *dds, const ddt_histogram_t *ddh)
429 bzero(dds, sizeof (*dds));
431 for (int h = 0; h < 64; h++)
432 ddt_stat_add(dds, &ddh->ddh_stat[h], 0);
436 ddt_histogram_empty(const ddt_histogram_t *ddh)
438 const uint64_t *s = (const uint64_t *)ddh;
439 const uint64_t *s_end = (const uint64_t *)(ddh + 1);
449 ddt_get_dedup_object_stats(spa_t *spa, ddt_object_t *ddo_total)
451 /* Sum the statistics we cached in ddt_object_sync(). */
452 for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
453 ddt_t *ddt = spa->spa_ddt[c];
454 for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
455 for (enum ddt_class class = 0; class < DDT_CLASSES;
458 &ddt->ddt_object_stats[type][class];
459 ddo_total->ddo_count += ddo->ddo_count;
460 ddo_total->ddo_dspace += ddo->ddo_dspace;
461 ddo_total->ddo_mspace += ddo->ddo_mspace;
466 /* ... and compute the averages. */
467 if (ddo_total->ddo_count != 0) {
468 ddo_total->ddo_dspace /= ddo_total->ddo_count;
469 ddo_total->ddo_mspace /= ddo_total->ddo_count;
474 ddt_get_dedup_histogram(spa_t *spa, ddt_histogram_t *ddh)
476 for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
477 ddt_t *ddt = spa->spa_ddt[c];
478 for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
479 for (enum ddt_class class = 0; class < DDT_CLASSES;
481 ddt_histogram_add(ddh,
482 &ddt->ddt_histogram_cache[type][class]);
489 ddt_get_dedup_stats(spa_t *spa, ddt_stat_t *dds_total)
491 ddt_histogram_t *ddh_total;
493 ddh_total = kmem_zalloc(sizeof (ddt_histogram_t), KM_SLEEP);
494 ddt_get_dedup_histogram(spa, ddh_total);
495 ddt_histogram_stat(dds_total, ddh_total);
496 kmem_free(ddh_total, sizeof (ddt_histogram_t));
500 ddt_get_dedup_dspace(spa_t *spa)
502 ddt_stat_t dds_total = { 0 };
504 ddt_get_dedup_stats(spa, &dds_total);
505 return (dds_total.dds_ref_dsize - dds_total.dds_dsize);
509 ddt_get_pool_dedup_ratio(spa_t *spa)
511 ddt_stat_t dds_total = { 0 };
513 ddt_get_dedup_stats(spa, &dds_total);
514 if (dds_total.dds_dsize == 0)
517 return (dds_total.dds_ref_dsize * 100 / dds_total.dds_dsize);
521 ddt_ditto_copies_needed(ddt_t *ddt, ddt_entry_t *dde, ddt_phys_t *ddp_willref)
523 spa_t *spa = ddt->ddt_spa;
524 uint64_t total_refcnt = 0;
525 uint64_t ditto = spa->spa_dedup_ditto;
526 int total_copies = 0;
527 int desired_copies = 0;
529 for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) {
530 ddt_phys_t *ddp = &dde->dde_phys[p];
531 zio_t *zio = dde->dde_lead_zio[p];
532 uint64_t refcnt = ddp->ddp_refcnt; /* committed refs */
534 refcnt += zio->io_parent_count; /* pending refs */
535 if (ddp == ddp_willref)
536 refcnt++; /* caller's ref */
538 total_refcnt += refcnt;
543 if (ditto == 0 || ditto > UINT32_MAX)
546 if (total_refcnt >= 1)
548 if (total_refcnt >= ditto)
550 if (total_refcnt >= ditto * ditto)
553 return (MAX(desired_copies, total_copies) - total_copies);
557 ddt_ditto_copies_present(ddt_entry_t *dde)
559 ddt_phys_t *ddp = &dde->dde_phys[DDT_PHYS_DITTO];
560 dva_t *dva = ddp->ddp_dva;
561 int copies = 0 - DVA_GET_GANG(dva);
563 for (int d = 0; d < SPA_DVAS_PER_BP; d++, dva++)
564 if (DVA_IS_VALID(dva))
567 ASSERT(copies >= 0 && copies < SPA_DVAS_PER_BP);
573 ddt_compress(void *src, uchar_t *dst, size_t s_len, size_t d_len)
575 uchar_t *version = dst++;
576 int cpfunc = ZIO_COMPRESS_ZLE;
577 zio_compress_info_t *ci = &zio_compress_table[cpfunc];
580 ASSERT(d_len >= s_len + 1); /* no compression plus version byte */
582 c_len = ci->ci_compress(src, dst, s_len, d_len - 1, ci->ci_level);
584 if (c_len == s_len) {
585 cpfunc = ZIO_COMPRESS_OFF;
586 bcopy(src, dst, s_len);
589 *version = (ZFS_HOST_BYTEORDER & DDT_COMPRESS_BYTEORDER_MASK) | cpfunc;
595 ddt_decompress(uchar_t *src, void *dst, size_t s_len, size_t d_len)
597 uchar_t version = *src++;
598 int cpfunc = version & DDT_COMPRESS_FUNCTION_MASK;
599 zio_compress_info_t *ci = &zio_compress_table[cpfunc];
601 if (ci->ci_decompress != NULL)
602 (void) ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level);
604 bcopy(src, dst, d_len);
606 if ((version ^ ZFS_HOST_BYTEORDER) & DDT_COMPRESS_BYTEORDER_MASK)
607 byteswap_uint64_array(dst, d_len);
611 ddt_select_by_checksum(spa_t *spa, enum zio_checksum c)
613 return (spa->spa_ddt[c]);
617 ddt_select(spa_t *spa, const blkptr_t *bp)
619 return (spa->spa_ddt[BP_GET_CHECKSUM(bp)]);
623 ddt_enter(ddt_t *ddt)
625 mutex_enter(&ddt->ddt_lock);
631 mutex_exit(&ddt->ddt_lock);
635 ddt_alloc(const ddt_key_t *ddk)
639 dde = kmem_zalloc(sizeof (ddt_entry_t), KM_SLEEP);
640 cv_init(&dde->dde_cv, NULL, CV_DEFAULT, NULL);
648 ddt_free(ddt_entry_t *dde)
650 ASSERT(!dde->dde_loading);
652 for (int p = 0; p < DDT_PHYS_TYPES; p++)
653 ASSERT(dde->dde_lead_zio[p] == NULL);
655 if (dde->dde_repair_data != NULL)
656 zio_buf_free(dde->dde_repair_data,
657 DDK_GET_PSIZE(&dde->dde_key));
659 cv_destroy(&dde->dde_cv);
660 kmem_free(dde, sizeof (*dde));
664 ddt_remove(ddt_t *ddt, ddt_entry_t *dde)
666 ASSERT(MUTEX_HELD(&ddt->ddt_lock));
668 avl_remove(&ddt->ddt_tree, dde);
673 ddt_lookup(ddt_t *ddt, const blkptr_t *bp, boolean_t add)
675 ddt_entry_t *dde, dde_search;
677 enum ddt_class class;
681 ASSERT(MUTEX_HELD(&ddt->ddt_lock));
683 ddt_key_fill(&dde_search.dde_key, bp);
685 dde = avl_find(&ddt->ddt_tree, &dde_search, &where);
689 dde = ddt_alloc(&dde_search.dde_key);
690 avl_insert(&ddt->ddt_tree, dde, where);
693 while (dde->dde_loading)
694 cv_wait(&dde->dde_cv, &ddt->ddt_lock);
699 dde->dde_loading = B_TRUE;
705 for (type = 0; type < DDT_TYPES; type++) {
706 for (class = 0; class < DDT_CLASSES; class++) {
707 error = ddt_object_lookup(ddt, type, class, dde);
715 ASSERT(error == 0 || error == ENOENT);
719 ASSERT(dde->dde_loaded == B_FALSE);
720 ASSERT(dde->dde_loading == B_TRUE);
722 dde->dde_type = type; /* will be DDT_TYPES if no entry found */
723 dde->dde_class = class; /* will be DDT_CLASSES if no entry found */
724 dde->dde_loaded = B_TRUE;
725 dde->dde_loading = B_FALSE;
728 ddt_stat_update(ddt, dde, -1ULL);
730 cv_broadcast(&dde->dde_cv);
736 ddt_prefetch(spa_t *spa, const blkptr_t *bp)
741 if (!zfs_dedup_prefetch || bp == NULL || !BP_GET_DEDUP(bp))
745 * We only remove the DDT once all tables are empty and only
746 * prefetch dedup blocks when there are entries in the DDT.
747 * Thus no locking is required as the DDT can't disappear on us.
749 ddt = ddt_select(spa, bp);
750 ddt_key_fill(&dde.dde_key, bp);
752 for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
753 for (enum ddt_class class = 0; class < DDT_CLASSES; class++) {
754 ddt_object_prefetch(ddt, type, class, &dde);
760 ddt_entry_compare(const void *x1, const void *x2)
762 const ddt_entry_t *dde1 = x1;
763 const ddt_entry_t *dde2 = x2;
764 const uint64_t *u1 = (const uint64_t *)&dde1->dde_key;
765 const uint64_t *u2 = (const uint64_t *)&dde2->dde_key;
767 for (int i = 0; i < DDT_KEY_WORDS; i++) {
778 ddt_table_alloc(spa_t *spa, enum zio_checksum c)
782 ddt = kmem_zalloc(sizeof (*ddt), KM_SLEEP);
784 mutex_init(&ddt->ddt_lock, NULL, MUTEX_DEFAULT, NULL);
785 avl_create(&ddt->ddt_tree, ddt_entry_compare,
786 sizeof (ddt_entry_t), offsetof(ddt_entry_t, dde_node));
787 avl_create(&ddt->ddt_repair_tree, ddt_entry_compare,
788 sizeof (ddt_entry_t), offsetof(ddt_entry_t, dde_node));
789 ddt->ddt_checksum = c;
791 ddt->ddt_os = spa->spa_meta_objset;
797 ddt_table_free(ddt_t *ddt)
799 ASSERT(avl_numnodes(&ddt->ddt_tree) == 0);
800 ASSERT(avl_numnodes(&ddt->ddt_repair_tree) == 0);
801 avl_destroy(&ddt->ddt_tree);
802 avl_destroy(&ddt->ddt_repair_tree);
803 mutex_destroy(&ddt->ddt_lock);
804 kmem_free(ddt, sizeof (*ddt));
808 ddt_create(spa_t *spa)
810 spa->spa_dedup_checksum = ZIO_DEDUPCHECKSUM;
812 for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++)
813 spa->spa_ddt[c] = ddt_table_alloc(spa, c);
823 error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
824 DMU_POOL_DDT_STATS, sizeof (uint64_t), 1,
825 &spa->spa_ddt_stat_object);
828 return (error == ENOENT ? 0 : error);
830 for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
831 ddt_t *ddt = spa->spa_ddt[c];
832 for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
833 for (enum ddt_class class = 0; class < DDT_CLASSES;
835 error = ddt_object_load(ddt, type, class);
836 if (error != 0 && error != ENOENT)
842 * Seed the cached histograms.
844 bcopy(ddt->ddt_histogram, &ddt->ddt_histogram_cache,
845 sizeof (ddt->ddt_histogram));
852 ddt_unload(spa_t *spa)
854 for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
855 if (spa->spa_ddt[c]) {
856 ddt_table_free(spa->spa_ddt[c]);
857 spa->spa_ddt[c] = NULL;
863 ddt_class_contains(spa_t *spa, enum ddt_class max_class, const blkptr_t *bp)
868 if (!BP_GET_DEDUP(bp))
871 if (max_class == DDT_CLASS_UNIQUE)
874 ddt = spa->spa_ddt[BP_GET_CHECKSUM(bp)];
876 ddt_key_fill(&dde.dde_key, bp);
878 for (enum ddt_type type = 0; type < DDT_TYPES; type++)
879 for (enum ddt_class class = 0; class <= max_class; class++)
880 if (ddt_object_lookup(ddt, type, class, &dde) == 0)
887 ddt_repair_start(ddt_t *ddt, const blkptr_t *bp)
892 ddt_key_fill(&ddk, bp);
894 dde = ddt_alloc(&ddk);
896 for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
897 for (enum ddt_class class = 0; class < DDT_CLASSES; class++) {
899 * We can only do repair if there are multiple copies
900 * of the block. For anything in the UNIQUE class,
901 * there's definitely only one copy, so don't even try.
903 if (class != DDT_CLASS_UNIQUE &&
904 ddt_object_lookup(ddt, type, class, dde) == 0)
909 bzero(dde->dde_phys, sizeof (dde->dde_phys));
915 ddt_repair_done(ddt_t *ddt, ddt_entry_t *dde)
921 if (dde->dde_repair_data != NULL && spa_writeable(ddt->ddt_spa) &&
922 avl_find(&ddt->ddt_repair_tree, dde, &where) == NULL)
923 avl_insert(&ddt->ddt_repair_tree, dde, where);
931 ddt_repair_entry_done(zio_t *zio)
933 ddt_entry_t *rdde = zio->io_private;
939 ddt_repair_entry(ddt_t *ddt, ddt_entry_t *dde, ddt_entry_t *rdde, zio_t *rio)
941 ddt_phys_t *ddp = dde->dde_phys;
942 ddt_phys_t *rddp = rdde->dde_phys;
943 ddt_key_t *ddk = &dde->dde_key;
944 ddt_key_t *rddk = &rdde->dde_key;
948 zio = zio_null(rio, rio->io_spa, NULL,
949 ddt_repair_entry_done, rdde, rio->io_flags);
951 for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++, rddp++) {
952 if (ddp->ddp_phys_birth == 0 ||
953 ddp->ddp_phys_birth != rddp->ddp_phys_birth ||
954 bcmp(ddp->ddp_dva, rddp->ddp_dva, sizeof (ddp->ddp_dva)))
956 ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk);
957 zio_nowait(zio_rewrite(zio, zio->io_spa, 0, &blk,
958 rdde->dde_repair_data, DDK_GET_PSIZE(rddk), NULL, NULL,
959 ZIO_PRIORITY_SYNC_WRITE, ZIO_DDT_CHILD_FLAGS(zio), NULL));
966 ddt_repair_table(ddt_t *ddt, zio_t *rio)
968 spa_t *spa = ddt->ddt_spa;
969 ddt_entry_t *dde, *rdde_next, *rdde;
970 avl_tree_t *t = &ddt->ddt_repair_tree;
973 if (spa_sync_pass(spa) > 1)
977 for (rdde = avl_first(t); rdde != NULL; rdde = rdde_next) {
978 rdde_next = AVL_NEXT(t, rdde);
979 avl_remove(&ddt->ddt_repair_tree, rdde);
981 ddt_bp_create(ddt->ddt_checksum, &rdde->dde_key, NULL, &blk);
982 dde = ddt_repair_start(ddt, &blk);
983 ddt_repair_entry(ddt, dde, rdde, rio);
984 ddt_repair_done(ddt, dde);
991 ddt_sync_entry(ddt_t *ddt, ddt_entry_t *dde, dmu_tx_t *tx, uint64_t txg)
993 dsl_pool_t *dp = ddt->ddt_spa->spa_dsl_pool;
994 ddt_phys_t *ddp = dde->dde_phys;
995 ddt_key_t *ddk = &dde->dde_key;
996 enum ddt_type otype = dde->dde_type;
997 enum ddt_type ntype = DDT_TYPE_CURRENT;
998 enum ddt_class oclass = dde->dde_class;
999 enum ddt_class nclass;
1000 uint64_t total_refcnt = 0;
1002 ASSERT(dde->dde_loaded);
1003 ASSERT(!dde->dde_loading);
1005 for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
1006 ASSERT(dde->dde_lead_zio[p] == NULL);
1007 ASSERT((int64_t)ddp->ddp_refcnt >= 0);
1008 if (ddp->ddp_phys_birth == 0) {
1009 ASSERT(ddp->ddp_refcnt == 0);
1012 if (p == DDT_PHYS_DITTO) {
1013 if (ddt_ditto_copies_needed(ddt, dde, NULL) == 0)
1014 ddt_phys_free(ddt, ddk, ddp, txg);
1017 if (ddp->ddp_refcnt == 0)
1018 ddt_phys_free(ddt, ddk, ddp, txg);
1019 total_refcnt += ddp->ddp_refcnt;
1022 if (dde->dde_phys[DDT_PHYS_DITTO].ddp_phys_birth != 0)
1023 nclass = DDT_CLASS_DITTO;
1024 else if (total_refcnt > 1)
1025 nclass = DDT_CLASS_DUPLICATE;
1027 nclass = DDT_CLASS_UNIQUE;
1029 if (otype != DDT_TYPES &&
1030 (otype != ntype || oclass != nclass || total_refcnt == 0)) {
1031 VERIFY(ddt_object_remove(ddt, otype, oclass, dde, tx) == 0);
1032 ASSERT(ddt_object_lookup(ddt, otype, oclass, dde) == ENOENT);
1035 if (total_refcnt != 0) {
1036 dde->dde_type = ntype;
1037 dde->dde_class = nclass;
1038 ddt_stat_update(ddt, dde, 0);
1039 if (!ddt_object_exists(ddt, ntype, nclass))
1040 ddt_object_create(ddt, ntype, nclass, tx);
1041 VERIFY(ddt_object_update(ddt, ntype, nclass, dde, tx) == 0);
1044 * If the class changes, the order that we scan this bp
1045 * changes. If it decreases, we could miss it, so
1046 * scan it right now. (This covers both class changing
1047 * while we are doing ddt_walk(), and when we are
1050 if (nclass < oclass) {
1051 dsl_scan_ddt_entry(dp->dp_scan,
1052 ddt->ddt_checksum, dde, tx);
1058 ddt_sync_table(ddt_t *ddt, dmu_tx_t *tx, uint64_t txg)
1060 spa_t *spa = ddt->ddt_spa;
1062 void *cookie = NULL;
1064 if (avl_numnodes(&ddt->ddt_tree) == 0)
1067 ASSERT(spa->spa_uberblock.ub_version >= SPA_VERSION_DEDUP);
1069 if (spa->spa_ddt_stat_object == 0) {
1070 spa->spa_ddt_stat_object = zap_create(ddt->ddt_os,
1071 DMU_OT_DDT_STATS, DMU_OT_NONE, 0, tx);
1072 VERIFY(zap_add(ddt->ddt_os, DMU_POOL_DIRECTORY_OBJECT,
1073 DMU_POOL_DDT_STATS, sizeof (uint64_t), 1,
1074 &spa->spa_ddt_stat_object, tx) == 0);
1077 while ((dde = avl_destroy_nodes(&ddt->ddt_tree, &cookie)) != NULL) {
1078 ddt_sync_entry(ddt, dde, tx, txg);
1082 for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
1084 for (enum ddt_class class = 0; class < DDT_CLASSES; class++) {
1085 if (ddt_object_exists(ddt, type, class)) {
1086 ddt_object_sync(ddt, type, class, tx);
1087 count += ddt_object_count(ddt, type, class);
1090 for (enum ddt_class class = 0; class < DDT_CLASSES; class++) {
1091 if (count == 0 && ddt_object_exists(ddt, type, class))
1092 ddt_object_destroy(ddt, type, class, tx);
1096 bcopy(ddt->ddt_histogram, &ddt->ddt_histogram_cache,
1097 sizeof (ddt->ddt_histogram));
1101 ddt_sync(spa_t *spa, uint64_t txg)
1104 zio_t *rio = zio_root(spa, NULL, NULL,
1105 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE);
1107 ASSERT(spa_syncing_txg(spa) == txg);
1109 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
1111 for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
1112 ddt_t *ddt = spa->spa_ddt[c];
1115 ddt_sync_table(ddt, tx, txg);
1116 ddt_repair_table(ddt, rio);
1119 (void) zio_wait(rio);
1125 ddt_walk(spa_t *spa, ddt_bookmark_t *ddb, ddt_entry_t *dde)
1130 ddt_t *ddt = spa->spa_ddt[ddb->ddb_checksum];
1132 if (ddt_object_exists(ddt, ddb->ddb_type,
1134 error = ddt_object_walk(ddt,
1135 ddb->ddb_type, ddb->ddb_class,
1136 &ddb->ddb_cursor, dde);
1138 dde->dde_type = ddb->ddb_type;
1139 dde->dde_class = ddb->ddb_class;
1142 if (error != ENOENT)
1144 ddb->ddb_cursor = 0;
1145 } while (++ddb->ddb_checksum < ZIO_CHECKSUM_FUNCTIONS);
1146 ddb->ddb_checksum = 0;
1147 } while (++ddb->ddb_type < DDT_TYPES);
1149 } while (++ddb->ddb_class < DDT_CLASSES);