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428870ff BB |
1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
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. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
1d3ba0bf | 9 | * or https://opensource.org/licenses/CDDL-1.0. |
428870ff BB |
10 | * See the License for the specific language governing permissions |
11 | * and limitations under the License. | |
12 | * | |
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] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | ||
22 | /* | |
23 | * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved. | |
a6255b7f | 24 | * Copyright (c) 2012, 2016 by Delphix. All rights reserved. |
67a1b037 | 25 | * Copyright (c) 2022 by Pawel Jakub Dawidek |
428870ff BB |
26 | */ |
27 | ||
28 | #include <sys/zfs_context.h> | |
29 | #include <sys/spa.h> | |
30 | #include <sys/spa_impl.h> | |
31 | #include <sys/zio.h> | |
32 | #include <sys/ddt.h> | |
8e414fcd | 33 | #include <sys/ddt_impl.h> |
428870ff BB |
34 | #include <sys/zap.h> |
35 | #include <sys/dmu_tx.h> | |
36 | #include <sys/arc.h> | |
37 | #include <sys/dsl_pool.h> | |
38 | #include <sys/zio_checksum.h> | |
428870ff | 39 | #include <sys/dsl_scan.h> |
a6255b7f | 40 | #include <sys/abd.h> |
428870ff | 41 | |
ecf3d9b8 JL |
42 | static kmem_cache_t *ddt_cache; |
43 | static kmem_cache_t *ddt_entry_cache; | |
44 | ||
572e2857 BB |
45 | /* |
46 | * Enable/disable prefetching of dedup-ed blocks which are going to be freed. | |
47 | */ | |
0dfc7324 | 48 | int zfs_dedup_prefetch = 0; |
572e2857 | 49 | |
861166b0 | 50 | static const ddt_ops_t *const ddt_ops[DDT_TYPES] = { |
428870ff BB |
51 | &ddt_zap_ops, |
52 | }; | |
53 | ||
861166b0 | 54 | static const char *const ddt_class_name[DDT_CLASSES] = { |
428870ff BB |
55 | "ditto", |
56 | "duplicate", | |
57 | "unique", | |
58 | }; | |
59 | ||
60 | static void | |
61 | ddt_object_create(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
62 | dmu_tx_t *tx) | |
63 | { | |
64 | spa_t *spa = ddt->ddt_spa; | |
65 | objset_t *os = ddt->ddt_os; | |
66 | uint64_t *objectp = &ddt->ddt_object[type][class]; | |
3c67d83a TH |
67 | boolean_t prehash = zio_checksum_table[ddt->ddt_checksum].ci_flags & |
68 | ZCHECKSUM_FLAG_DEDUP; | |
428870ff BB |
69 | char name[DDT_NAMELEN]; |
70 | ||
71 | ddt_object_name(ddt, type, class, name); | |
72 | ||
d3bafe45 RN |
73 | ASSERT3U(*objectp, ==, 0); |
74 | VERIFY0(ddt_ops[type]->ddt_op_create(os, objectp, tx, prehash)); | |
75 | ASSERT3U(*objectp, !=, 0); | |
428870ff | 76 | |
d3bafe45 RN |
77 | VERIFY0(zap_add(os, DMU_POOL_DIRECTORY_OBJECT, name, |
78 | sizeof (uint64_t), 1, objectp, tx)); | |
428870ff | 79 | |
d3bafe45 | 80 | VERIFY0(zap_add(os, spa->spa_ddt_stat_object, name, |
428870ff | 81 | sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t), |
d3bafe45 | 82 | &ddt->ddt_histogram[type][class], tx)); |
428870ff BB |
83 | } |
84 | ||
85 | static void | |
86 | ddt_object_destroy(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
87 | dmu_tx_t *tx) | |
88 | { | |
89 | spa_t *spa = ddt->ddt_spa; | |
90 | objset_t *os = ddt->ddt_os; | |
91 | uint64_t *objectp = &ddt->ddt_object[type][class]; | |
e8fd45a0 | 92 | uint64_t count; |
428870ff BB |
93 | char name[DDT_NAMELEN]; |
94 | ||
95 | ddt_object_name(ddt, type, class, name); | |
96 | ||
d3bafe45 | 97 | ASSERT3U(*objectp, !=, 0); |
428870ff | 98 | ASSERT(ddt_histogram_empty(&ddt->ddt_histogram[type][class])); |
d3bafe45 RN |
99 | VERIFY0(ddt_object_count(ddt, type, class, &count)); |
100 | VERIFY0(count); | |
101 | VERIFY0(zap_remove(os, DMU_POOL_DIRECTORY_OBJECT, name, tx)); | |
102 | VERIFY0(zap_remove(os, spa->spa_ddt_stat_object, name, tx)); | |
103 | VERIFY0(ddt_ops[type]->ddt_op_destroy(os, *objectp, tx)); | |
861166b0 | 104 | memset(&ddt->ddt_object_stats[type][class], 0, sizeof (ddt_object_t)); |
428870ff BB |
105 | |
106 | *objectp = 0; | |
107 | } | |
108 | ||
109 | static int | |
110 | ddt_object_load(ddt_t *ddt, enum ddt_type type, enum ddt_class class) | |
111 | { | |
112 | ddt_object_t *ddo = &ddt->ddt_object_stats[type][class]; | |
113 | dmu_object_info_t doi; | |
e8fd45a0 | 114 | uint64_t count; |
428870ff BB |
115 | char name[DDT_NAMELEN]; |
116 | int error; | |
117 | ||
118 | ddt_object_name(ddt, type, class, name); | |
119 | ||
120 | error = zap_lookup(ddt->ddt_os, DMU_POOL_DIRECTORY_OBJECT, name, | |
121 | sizeof (uint64_t), 1, &ddt->ddt_object[type][class]); | |
b0bc7a84 | 122 | if (error != 0) |
428870ff BB |
123 | return (error); |
124 | ||
ff9b1d07 | 125 | error = zap_lookup(ddt->ddt_os, ddt->ddt_spa->spa_ddt_stat_object, name, |
428870ff | 126 | sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t), |
ff9b1d07 BB |
127 | &ddt->ddt_histogram[type][class]); |
128 | if (error != 0) | |
129 | return (error); | |
428870ff BB |
130 | |
131 | /* | |
132 | * Seed the cached statistics. | |
133 | */ | |
2a4a9dc2 BB |
134 | error = ddt_object_info(ddt, type, class, &doi); |
135 | if (error) | |
136 | return (error); | |
428870ff | 137 | |
e8fd45a0 BB |
138 | error = ddt_object_count(ddt, type, class, &count); |
139 | if (error) | |
140 | return (error); | |
141 | ||
142 | ddo->ddo_count = count; | |
428870ff BB |
143 | ddo->ddo_dspace = doi.doi_physical_blocks_512 << 9; |
144 | ddo->ddo_mspace = doi.doi_fill_count * doi.doi_data_block_size; | |
145 | ||
b0bc7a84 | 146 | return (0); |
428870ff BB |
147 | } |
148 | ||
149 | static void | |
150 | ddt_object_sync(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
151 | dmu_tx_t *tx) | |
152 | { | |
153 | ddt_object_t *ddo = &ddt->ddt_object_stats[type][class]; | |
154 | dmu_object_info_t doi; | |
e8fd45a0 | 155 | uint64_t count; |
428870ff BB |
156 | char name[DDT_NAMELEN]; |
157 | ||
158 | ddt_object_name(ddt, type, class, name); | |
159 | ||
d3bafe45 | 160 | VERIFY0(zap_update(ddt->ddt_os, ddt->ddt_spa->spa_ddt_stat_object, name, |
428870ff | 161 | sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t), |
d3bafe45 | 162 | &ddt->ddt_histogram[type][class], tx)); |
428870ff BB |
163 | |
164 | /* | |
165 | * Cache DDT statistics; this is the only time they'll change. | |
166 | */ | |
d3bafe45 RN |
167 | VERIFY0(ddt_object_info(ddt, type, class, &doi)); |
168 | VERIFY0(ddt_object_count(ddt, type, class, &count)); | |
428870ff | 169 | |
e8fd45a0 | 170 | ddo->ddo_count = count; |
428870ff BB |
171 | ddo->ddo_dspace = doi.doi_physical_blocks_512 << 9; |
172 | ddo->ddo_mspace = doi.doi_fill_count * doi.doi_data_block_size; | |
173 | } | |
174 | ||
8e414fcd RN |
175 | static boolean_t |
176 | ddt_object_exists(ddt_t *ddt, enum ddt_type type, enum ddt_class class) | |
177 | { | |
178 | return (!!ddt->ddt_object[type][class]); | |
179 | } | |
180 | ||
428870ff BB |
181 | static int |
182 | ddt_object_lookup(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
183 | ddt_entry_t *dde) | |
184 | { | |
185 | if (!ddt_object_exists(ddt, type, class)) | |
2e528b49 | 186 | return (SET_ERROR(ENOENT)); |
428870ff BB |
187 | |
188 | return (ddt_ops[type]->ddt_op_lookup(ddt->ddt_os, | |
189 | ddt->ddt_object[type][class], dde)); | |
190 | } | |
191 | ||
192 | static void | |
193 | ddt_object_prefetch(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
194 | ddt_entry_t *dde) | |
195 | { | |
196 | if (!ddt_object_exists(ddt, type, class)) | |
197 | return; | |
198 | ||
199 | ddt_ops[type]->ddt_op_prefetch(ddt->ddt_os, | |
200 | ddt->ddt_object[type][class], dde); | |
201 | } | |
202 | ||
8e414fcd | 203 | static int |
428870ff BB |
204 | ddt_object_update(ddt_t *ddt, enum ddt_type type, enum ddt_class class, |
205 | ddt_entry_t *dde, dmu_tx_t *tx) | |
206 | { | |
207 | ASSERT(ddt_object_exists(ddt, type, class)); | |
208 | ||
209 | return (ddt_ops[type]->ddt_op_update(ddt->ddt_os, | |
210 | ddt->ddt_object[type][class], dde, tx)); | |
211 | } | |
212 | ||
213 | static int | |
214 | ddt_object_remove(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
215 | ddt_entry_t *dde, dmu_tx_t *tx) | |
216 | { | |
217 | ASSERT(ddt_object_exists(ddt, type, class)); | |
218 | ||
219 | return (ddt_ops[type]->ddt_op_remove(ddt->ddt_os, | |
220 | ddt->ddt_object[type][class], dde, tx)); | |
221 | } | |
222 | ||
223 | int | |
224 | ddt_object_walk(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
225 | uint64_t *walk, ddt_entry_t *dde) | |
226 | { | |
227 | ASSERT(ddt_object_exists(ddt, type, class)); | |
228 | ||
229 | return (ddt_ops[type]->ddt_op_walk(ddt->ddt_os, | |
230 | ddt->ddt_object[type][class], dde, walk)); | |
231 | } | |
232 | ||
e8fd45a0 BB |
233 | int |
234 | ddt_object_count(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
235 | uint64_t *count) | |
428870ff BB |
236 | { |
237 | ASSERT(ddt_object_exists(ddt, type, class)); | |
238 | ||
239 | return (ddt_ops[type]->ddt_op_count(ddt->ddt_os, | |
e8fd45a0 | 240 | ddt->ddt_object[type][class], count)); |
428870ff BB |
241 | } |
242 | ||
243 | int | |
244 | ddt_object_info(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
245 | dmu_object_info_t *doi) | |
246 | { | |
247 | if (!ddt_object_exists(ddt, type, class)) | |
2e528b49 | 248 | return (SET_ERROR(ENOENT)); |
428870ff BB |
249 | |
250 | return (dmu_object_info(ddt->ddt_os, ddt->ddt_object[type][class], | |
251 | doi)); | |
252 | } | |
253 | ||
428870ff BB |
254 | void |
255 | ddt_object_name(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
256 | char *name) | |
257 | { | |
c9e319fa | 258 | (void) snprintf(name, DDT_NAMELEN, DMU_POOL_DDT, |
428870ff BB |
259 | zio_checksum_table[ddt->ddt_checksum].ci_name, |
260 | ddt_ops[type]->ddt_op_name, ddt_class_name[class]); | |
261 | } | |
262 | ||
263 | void | |
264 | ddt_bp_fill(const ddt_phys_t *ddp, blkptr_t *bp, uint64_t txg) | |
265 | { | |
d3bafe45 | 266 | ASSERT3U(txg, !=, 0); |
428870ff | 267 | |
1c27024e | 268 | for (int d = 0; d < SPA_DVAS_PER_BP; d++) |
428870ff BB |
269 | bp->blk_dva[d] = ddp->ddp_dva[d]; |
270 | BP_SET_BIRTH(bp, txg, ddp->ddp_phys_birth); | |
271 | } | |
272 | ||
b5256303 TC |
273 | /* |
274 | * The bp created via this function may be used for repairs and scrub, but it | |
275 | * will be missing the salt / IV required to do a full decrypting read. | |
276 | */ | |
428870ff BB |
277 | void |
278 | ddt_bp_create(enum zio_checksum checksum, | |
279 | const ddt_key_t *ddk, const ddt_phys_t *ddp, blkptr_t *bp) | |
280 | { | |
281 | BP_ZERO(bp); | |
282 | ||
283 | if (ddp != NULL) | |
284 | ddt_bp_fill(ddp, bp, ddp->ddp_phys_birth); | |
285 | ||
286 | bp->blk_cksum = ddk->ddk_cksum; | |
428870ff BB |
287 | |
288 | BP_SET_LSIZE(bp, DDK_GET_LSIZE(ddk)); | |
289 | BP_SET_PSIZE(bp, DDK_GET_PSIZE(ddk)); | |
290 | BP_SET_COMPRESS(bp, DDK_GET_COMPRESS(ddk)); | |
b5256303 TC |
291 | BP_SET_CRYPT(bp, DDK_GET_CRYPT(ddk)); |
292 | BP_SET_FILL(bp, 1); | |
428870ff BB |
293 | BP_SET_CHECKSUM(bp, checksum); |
294 | BP_SET_TYPE(bp, DMU_OT_DEDUP); | |
295 | BP_SET_LEVEL(bp, 0); | |
52b68423 | 296 | BP_SET_DEDUP(bp, 1); |
428870ff BB |
297 | BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); |
298 | } | |
299 | ||
300 | void | |
301 | ddt_key_fill(ddt_key_t *ddk, const blkptr_t *bp) | |
302 | { | |
303 | ddk->ddk_cksum = bp->blk_cksum; | |
304 | ddk->ddk_prop = 0; | |
305 | ||
b5256303 TC |
306 | ASSERT(BP_IS_ENCRYPTED(bp) || !BP_USES_CRYPT(bp)); |
307 | ||
428870ff BB |
308 | DDK_SET_LSIZE(ddk, BP_GET_LSIZE(bp)); |
309 | DDK_SET_PSIZE(ddk, BP_GET_PSIZE(bp)); | |
310 | DDK_SET_COMPRESS(ddk, BP_GET_COMPRESS(bp)); | |
b5256303 | 311 | DDK_SET_CRYPT(ddk, BP_USES_CRYPT(bp)); |
428870ff BB |
312 | } |
313 | ||
314 | void | |
315 | ddt_phys_fill(ddt_phys_t *ddp, const blkptr_t *bp) | |
316 | { | |
d3bafe45 | 317 | ASSERT0(ddp->ddp_phys_birth); |
428870ff | 318 | |
1c27024e | 319 | for (int d = 0; d < SPA_DVAS_PER_BP; d++) |
428870ff BB |
320 | ddp->ddp_dva[d] = bp->blk_dva[d]; |
321 | ddp->ddp_phys_birth = BP_PHYSICAL_BIRTH(bp); | |
322 | } | |
323 | ||
324 | void | |
325 | ddt_phys_clear(ddt_phys_t *ddp) | |
326 | { | |
861166b0 | 327 | memset(ddp, 0, sizeof (*ddp)); |
428870ff BB |
328 | } |
329 | ||
330 | void | |
331 | ddt_phys_addref(ddt_phys_t *ddp) | |
332 | { | |
333 | ddp->ddp_refcnt++; | |
334 | } | |
335 | ||
336 | void | |
337 | ddt_phys_decref(ddt_phys_t *ddp) | |
338 | { | |
5dc6af0e | 339 | if (ddp) { |
d3bafe45 | 340 | ASSERT3U(ddp->ddp_refcnt, >, 0); |
5dc6af0e BB |
341 | ddp->ddp_refcnt--; |
342 | } | |
428870ff BB |
343 | } |
344 | ||
8e414fcd | 345 | static void |
428870ff BB |
346 | ddt_phys_free(ddt_t *ddt, ddt_key_t *ddk, ddt_phys_t *ddp, uint64_t txg) |
347 | { | |
348 | blkptr_t blk; | |
349 | ||
350 | ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk); | |
52b68423 BB |
351 | |
352 | /* | |
353 | * We clear the dedup bit so that zio_free() will actually free the | |
354 | * space, rather than just decrementing the refcount in the DDT. | |
355 | */ | |
356 | BP_SET_DEDUP(&blk, 0); | |
357 | ||
428870ff BB |
358 | ddt_phys_clear(ddp); |
359 | zio_free(ddt->ddt_spa, txg, &blk); | |
360 | } | |
361 | ||
362 | ddt_phys_t * | |
363 | ddt_phys_select(const ddt_entry_t *dde, const blkptr_t *bp) | |
364 | { | |
365 | ddt_phys_t *ddp = (ddt_phys_t *)dde->dde_phys; | |
366 | ||
1c27024e | 367 | for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
428870ff BB |
368 | if (DVA_EQUAL(BP_IDENTITY(bp), &ddp->ddp_dva[0]) && |
369 | BP_PHYSICAL_BIRTH(bp) == ddp->ddp_phys_birth) | |
370 | return (ddp); | |
371 | } | |
372 | return (NULL); | |
373 | } | |
374 | ||
375 | uint64_t | |
376 | ddt_phys_total_refcnt(const ddt_entry_t *dde) | |
377 | { | |
378 | uint64_t refcnt = 0; | |
379 | ||
1c27024e | 380 | for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) |
428870ff BB |
381 | refcnt += dde->dde_phys[p].ddp_refcnt; |
382 | ||
383 | return (refcnt); | |
384 | } | |
385 | ||
428870ff BB |
386 | ddt_t * |
387 | ddt_select(spa_t *spa, const blkptr_t *bp) | |
388 | { | |
389 | return (spa->spa_ddt[BP_GET_CHECKSUM(bp)]); | |
390 | } | |
391 | ||
392 | void | |
393 | ddt_enter(ddt_t *ddt) | |
394 | { | |
395 | mutex_enter(&ddt->ddt_lock); | |
396 | } | |
397 | ||
398 | void | |
399 | ddt_exit(ddt_t *ddt) | |
400 | { | |
401 | mutex_exit(&ddt->ddt_lock); | |
402 | } | |
403 | ||
ecf3d9b8 JL |
404 | void |
405 | ddt_init(void) | |
406 | { | |
407 | ddt_cache = kmem_cache_create("ddt_cache", | |
408 | sizeof (ddt_t), 0, NULL, NULL, NULL, NULL, NULL, 0); | |
409 | ddt_entry_cache = kmem_cache_create("ddt_entry_cache", | |
410 | sizeof (ddt_entry_t), 0, NULL, NULL, NULL, NULL, NULL, 0); | |
411 | } | |
412 | ||
413 | void | |
414 | ddt_fini(void) | |
415 | { | |
416 | kmem_cache_destroy(ddt_entry_cache); | |
417 | kmem_cache_destroy(ddt_cache); | |
418 | } | |
419 | ||
428870ff BB |
420 | static ddt_entry_t * |
421 | ddt_alloc(const ddt_key_t *ddk) | |
422 | { | |
423 | ddt_entry_t *dde; | |
424 | ||
79c76d5b | 425 | dde = kmem_cache_alloc(ddt_entry_cache, KM_SLEEP); |
861166b0 | 426 | memset(dde, 0, sizeof (ddt_entry_t)); |
428870ff BB |
427 | cv_init(&dde->dde_cv, NULL, CV_DEFAULT, NULL); |
428 | ||
429 | dde->dde_key = *ddk; | |
430 | ||
431 | return (dde); | |
432 | } | |
433 | ||
434 | static void | |
435 | ddt_free(ddt_entry_t *dde) | |
436 | { | |
437 | ASSERT(!dde->dde_loading); | |
438 | ||
1c27024e | 439 | for (int p = 0; p < DDT_PHYS_TYPES; p++) |
d3bafe45 | 440 | ASSERT3P(dde->dde_lead_zio[p], ==, NULL); |
428870ff | 441 | |
a6255b7f DQ |
442 | if (dde->dde_repair_abd != NULL) |
443 | abd_free(dde->dde_repair_abd); | |
428870ff BB |
444 | |
445 | cv_destroy(&dde->dde_cv); | |
ecf3d9b8 | 446 | kmem_cache_free(ddt_entry_cache, dde); |
428870ff BB |
447 | } |
448 | ||
449 | void | |
450 | ddt_remove(ddt_t *ddt, ddt_entry_t *dde) | |
451 | { | |
452 | ASSERT(MUTEX_HELD(&ddt->ddt_lock)); | |
453 | ||
454 | avl_remove(&ddt->ddt_tree, dde); | |
455 | ddt_free(dde); | |
456 | } | |
457 | ||
458 | ddt_entry_t * | |
459 | ddt_lookup(ddt_t *ddt, const blkptr_t *bp, boolean_t add) | |
460 | { | |
0cb1ef60 RN |
461 | ddt_key_t search; |
462 | ddt_entry_t *dde; | |
428870ff BB |
463 | enum ddt_type type; |
464 | enum ddt_class class; | |
465 | avl_index_t where; | |
466 | int error; | |
467 | ||
468 | ASSERT(MUTEX_HELD(&ddt->ddt_lock)); | |
469 | ||
0cb1ef60 | 470 | ddt_key_fill(&search, bp); |
428870ff | 471 | |
0cb1ef60 | 472 | dde = avl_find(&ddt->ddt_tree, &search, &where); |
428870ff BB |
473 | if (dde == NULL) { |
474 | if (!add) | |
475 | return (NULL); | |
0cb1ef60 | 476 | dde = ddt_alloc(&search); |
428870ff BB |
477 | avl_insert(&ddt->ddt_tree, dde, where); |
478 | } | |
479 | ||
480 | while (dde->dde_loading) | |
481 | cv_wait(&dde->dde_cv, &ddt->ddt_lock); | |
482 | ||
483 | if (dde->dde_loaded) | |
484 | return (dde); | |
485 | ||
486 | dde->dde_loading = B_TRUE; | |
487 | ||
488 | ddt_exit(ddt); | |
489 | ||
490 | error = ENOENT; | |
491 | ||
492 | for (type = 0; type < DDT_TYPES; type++) { | |
493 | for (class = 0; class < DDT_CLASSES; class++) { | |
494 | error = ddt_object_lookup(ddt, type, class, dde); | |
a1d477c2 MA |
495 | if (error != ENOENT) { |
496 | ASSERT0(error); | |
428870ff | 497 | break; |
a1d477c2 | 498 | } |
428870ff BB |
499 | } |
500 | if (error != ENOENT) | |
501 | break; | |
502 | } | |
503 | ||
428870ff BB |
504 | ddt_enter(ddt); |
505 | ||
d3bafe45 RN |
506 | ASSERT(!dde->dde_loaded); |
507 | ASSERT(dde->dde_loading); | |
428870ff BB |
508 | |
509 | dde->dde_type = type; /* will be DDT_TYPES if no entry found */ | |
510 | dde->dde_class = class; /* will be DDT_CLASSES if no entry found */ | |
511 | dde->dde_loaded = B_TRUE; | |
512 | dde->dde_loading = B_FALSE; | |
513 | ||
514 | if (error == 0) | |
515 | ddt_stat_update(ddt, dde, -1ULL); | |
516 | ||
517 | cv_broadcast(&dde->dde_cv); | |
518 | ||
519 | return (dde); | |
520 | } | |
521 | ||
522 | void | |
523 | ddt_prefetch(spa_t *spa, const blkptr_t *bp) | |
524 | { | |
525 | ddt_t *ddt; | |
526 | ddt_entry_t dde; | |
527 | ||
572e2857 | 528 | if (!zfs_dedup_prefetch || bp == NULL || !BP_GET_DEDUP(bp)) |
428870ff BB |
529 | return; |
530 | ||
531 | /* | |
572e2857 BB |
532 | * We only remove the DDT once all tables are empty and only |
533 | * prefetch dedup blocks when there are entries in the DDT. | |
534 | * Thus no locking is required as the DDT can't disappear on us. | |
428870ff BB |
535 | */ |
536 | ddt = ddt_select(spa, bp); | |
537 | ddt_key_fill(&dde.dde_key, bp); | |
538 | ||
1c27024e DB |
539 | for (enum ddt_type type = 0; type < DDT_TYPES; type++) { |
540 | for (enum ddt_class class = 0; class < DDT_CLASSES; class++) { | |
428870ff BB |
541 | ddt_object_prefetch(ddt, type, class, &dde); |
542 | } | |
543 | } | |
544 | } | |
545 | ||
ee36c709 | 546 | /* |
0cb1ef60 RN |
547 | * Key comparison. Any struct wanting to make use of this function must have |
548 | * the key as the first element. | |
ee36c709 GN |
549 | */ |
550 | #define DDT_KEY_CMP_LEN (sizeof (ddt_key_t) / sizeof (uint16_t)) | |
551 | ||
552 | typedef struct ddt_key_cmp { | |
553 | uint16_t u16[DDT_KEY_CMP_LEN]; | |
554 | } ddt_key_cmp_t; | |
555 | ||
428870ff | 556 | int |
0cb1ef60 | 557 | ddt_key_compare(const void *x1, const void *x2) |
428870ff | 558 | { |
0cb1ef60 RN |
559 | const ddt_key_cmp_t *k1 = (const ddt_key_cmp_t *)x1; |
560 | const ddt_key_cmp_t *k2 = (const ddt_key_cmp_t *)x2; | |
ee36c709 | 561 | int32_t cmp = 0; |
428870ff | 562 | |
1c27024e | 563 | for (int i = 0; i < DDT_KEY_CMP_LEN; i++) { |
ee36c709 GN |
564 | cmp = (int32_t)k1->u16[i] - (int32_t)k2->u16[i]; |
565 | if (likely(cmp)) | |
566 | break; | |
428870ff BB |
567 | } |
568 | ||
ca577779 | 569 | return (TREE_ISIGN(cmp)); |
428870ff BB |
570 | } |
571 | ||
572 | static ddt_t * | |
573 | ddt_table_alloc(spa_t *spa, enum zio_checksum c) | |
574 | { | |
575 | ddt_t *ddt; | |
576 | ||
79c76d5b | 577 | ddt = kmem_cache_alloc(ddt_cache, KM_SLEEP); |
861166b0 | 578 | memset(ddt, 0, sizeof (ddt_t)); |
428870ff BB |
579 | |
580 | mutex_init(&ddt->ddt_lock, NULL, MUTEX_DEFAULT, NULL); | |
0cb1ef60 | 581 | avl_create(&ddt->ddt_tree, ddt_key_compare, |
428870ff | 582 | sizeof (ddt_entry_t), offsetof(ddt_entry_t, dde_node)); |
0cb1ef60 | 583 | avl_create(&ddt->ddt_repair_tree, ddt_key_compare, |
428870ff BB |
584 | sizeof (ddt_entry_t), offsetof(ddt_entry_t, dde_node)); |
585 | ddt->ddt_checksum = c; | |
586 | ddt->ddt_spa = spa; | |
587 | ddt->ddt_os = spa->spa_meta_objset; | |
588 | ||
589 | return (ddt); | |
590 | } | |
591 | ||
592 | static void | |
593 | ddt_table_free(ddt_t *ddt) | |
594 | { | |
d3bafe45 RN |
595 | ASSERT0(avl_numnodes(&ddt->ddt_tree)); |
596 | ASSERT0(avl_numnodes(&ddt->ddt_repair_tree)); | |
428870ff BB |
597 | avl_destroy(&ddt->ddt_tree); |
598 | avl_destroy(&ddt->ddt_repair_tree); | |
599 | mutex_destroy(&ddt->ddt_lock); | |
ecf3d9b8 | 600 | kmem_cache_free(ddt_cache, ddt); |
428870ff BB |
601 | } |
602 | ||
603 | void | |
604 | ddt_create(spa_t *spa) | |
605 | { | |
606 | spa->spa_dedup_checksum = ZIO_DEDUPCHECKSUM; | |
607 | ||
1c27024e | 608 | for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) |
428870ff BB |
609 | spa->spa_ddt[c] = ddt_table_alloc(spa, c); |
610 | } | |
611 | ||
612 | int | |
613 | ddt_load(spa_t *spa) | |
614 | { | |
615 | int error; | |
616 | ||
617 | ddt_create(spa); | |
618 | ||
619 | error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
620 | DMU_POOL_DDT_STATS, sizeof (uint64_t), 1, | |
621 | &spa->spa_ddt_stat_object); | |
622 | ||
623 | if (error) | |
624 | return (error == ENOENT ? 0 : error); | |
625 | ||
1c27024e | 626 | for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { |
428870ff | 627 | ddt_t *ddt = spa->spa_ddt[c]; |
1c27024e DB |
628 | for (enum ddt_type type = 0; type < DDT_TYPES; type++) { |
629 | for (enum ddt_class class = 0; class < DDT_CLASSES; | |
428870ff BB |
630 | class++) { |
631 | error = ddt_object_load(ddt, type, class); | |
632 | if (error != 0 && error != ENOENT) | |
633 | return (error); | |
634 | } | |
635 | } | |
636 | ||
637 | /* | |
638 | * Seed the cached histograms. | |
639 | */ | |
861166b0 | 640 | memcpy(&ddt->ddt_histogram_cache, ddt->ddt_histogram, |
428870ff | 641 | sizeof (ddt->ddt_histogram)); |
e8a20144 | 642 | spa->spa_dedup_dspace = ~0ULL; |
428870ff BB |
643 | } |
644 | ||
645 | return (0); | |
646 | } | |
647 | ||
648 | void | |
649 | ddt_unload(spa_t *spa) | |
650 | { | |
1c27024e | 651 | for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { |
428870ff BB |
652 | if (spa->spa_ddt[c]) { |
653 | ddt_table_free(spa->spa_ddt[c]); | |
654 | spa->spa_ddt[c] = NULL; | |
655 | } | |
656 | } | |
657 | } | |
658 | ||
659 | boolean_t | |
660 | ddt_class_contains(spa_t *spa, enum ddt_class max_class, const blkptr_t *bp) | |
661 | { | |
662 | ddt_t *ddt; | |
e95b3bdc | 663 | ddt_entry_t *dde; |
428870ff BB |
664 | |
665 | if (!BP_GET_DEDUP(bp)) | |
666 | return (B_FALSE); | |
667 | ||
668 | if (max_class == DDT_CLASS_UNIQUE) | |
669 | return (B_TRUE); | |
670 | ||
671 | ddt = spa->spa_ddt[BP_GET_CHECKSUM(bp)]; | |
79c76d5b | 672 | dde = kmem_cache_alloc(ddt_entry_cache, KM_SLEEP); |
428870ff | 673 | |
e95b3bdc | 674 | ddt_key_fill(&(dde->dde_key), bp); |
428870ff | 675 | |
1c27024e DB |
676 | for (enum ddt_type type = 0; type < DDT_TYPES; type++) { |
677 | for (enum ddt_class class = 0; class <= max_class; class++) { | |
e95b3bdc | 678 | if (ddt_object_lookup(ddt, type, class, dde) == 0) { |
ecf3d9b8 | 679 | kmem_cache_free(ddt_entry_cache, dde); |
428870ff | 680 | return (B_TRUE); |
e95b3bdc BB |
681 | } |
682 | } | |
683 | } | |
428870ff | 684 | |
ecf3d9b8 | 685 | kmem_cache_free(ddt_entry_cache, dde); |
428870ff BB |
686 | return (B_FALSE); |
687 | } | |
688 | ||
689 | ddt_entry_t * | |
690 | ddt_repair_start(ddt_t *ddt, const blkptr_t *bp) | |
691 | { | |
692 | ddt_key_t ddk; | |
693 | ddt_entry_t *dde; | |
694 | ||
695 | ddt_key_fill(&ddk, bp); | |
696 | ||
697 | dde = ddt_alloc(&ddk); | |
698 | ||
1c27024e DB |
699 | for (enum ddt_type type = 0; type < DDT_TYPES; type++) { |
700 | for (enum ddt_class class = 0; class < DDT_CLASSES; class++) { | |
428870ff BB |
701 | /* |
702 | * We can only do repair if there are multiple copies | |
703 | * of the block. For anything in the UNIQUE class, | |
704 | * there's definitely only one copy, so don't even try. | |
705 | */ | |
706 | if (class != DDT_CLASS_UNIQUE && | |
707 | ddt_object_lookup(ddt, type, class, dde) == 0) | |
708 | return (dde); | |
709 | } | |
710 | } | |
711 | ||
861166b0 | 712 | memset(dde->dde_phys, 0, sizeof (dde->dde_phys)); |
428870ff BB |
713 | |
714 | return (dde); | |
715 | } | |
716 | ||
717 | void | |
718 | ddt_repair_done(ddt_t *ddt, ddt_entry_t *dde) | |
719 | { | |
720 | avl_index_t where; | |
721 | ||
722 | ddt_enter(ddt); | |
723 | ||
a6255b7f | 724 | if (dde->dde_repair_abd != NULL && spa_writeable(ddt->ddt_spa) && |
428870ff BB |
725 | avl_find(&ddt->ddt_repair_tree, dde, &where) == NULL) |
726 | avl_insert(&ddt->ddt_repair_tree, dde, where); | |
727 | else | |
728 | ddt_free(dde); | |
729 | ||
730 | ddt_exit(ddt); | |
731 | } | |
732 | ||
733 | static void | |
734 | ddt_repair_entry_done(zio_t *zio) | |
735 | { | |
736 | ddt_entry_t *rdde = zio->io_private; | |
737 | ||
738 | ddt_free(rdde); | |
739 | } | |
740 | ||
741 | static void | |
742 | ddt_repair_entry(ddt_t *ddt, ddt_entry_t *dde, ddt_entry_t *rdde, zio_t *rio) | |
743 | { | |
744 | ddt_phys_t *ddp = dde->dde_phys; | |
745 | ddt_phys_t *rddp = rdde->dde_phys; | |
746 | ddt_key_t *ddk = &dde->dde_key; | |
747 | ddt_key_t *rddk = &rdde->dde_key; | |
748 | zio_t *zio; | |
749 | blkptr_t blk; | |
750 | ||
751 | zio = zio_null(rio, rio->io_spa, NULL, | |
752 | ddt_repair_entry_done, rdde, rio->io_flags); | |
753 | ||
1c27024e | 754 | for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++, rddp++) { |
428870ff BB |
755 | if (ddp->ddp_phys_birth == 0 || |
756 | ddp->ddp_phys_birth != rddp->ddp_phys_birth || | |
861166b0 | 757 | memcmp(ddp->ddp_dva, rddp->ddp_dva, sizeof (ddp->ddp_dva))) |
428870ff BB |
758 | continue; |
759 | ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk); | |
760 | zio_nowait(zio_rewrite(zio, zio->io_spa, 0, &blk, | |
a6255b7f | 761 | rdde->dde_repair_abd, DDK_GET_PSIZE(rddk), NULL, NULL, |
428870ff BB |
762 | ZIO_PRIORITY_SYNC_WRITE, ZIO_DDT_CHILD_FLAGS(zio), NULL)); |
763 | } | |
764 | ||
765 | zio_nowait(zio); | |
766 | } | |
767 | ||
768 | static void | |
769 | ddt_repair_table(ddt_t *ddt, zio_t *rio) | |
770 | { | |
771 | spa_t *spa = ddt->ddt_spa; | |
772 | ddt_entry_t *dde, *rdde_next, *rdde; | |
773 | avl_tree_t *t = &ddt->ddt_repair_tree; | |
774 | blkptr_t blk; | |
775 | ||
776 | if (spa_sync_pass(spa) > 1) | |
777 | return; | |
778 | ||
779 | ddt_enter(ddt); | |
780 | for (rdde = avl_first(t); rdde != NULL; rdde = rdde_next) { | |
781 | rdde_next = AVL_NEXT(t, rdde); | |
782 | avl_remove(&ddt->ddt_repair_tree, rdde); | |
783 | ddt_exit(ddt); | |
784 | ddt_bp_create(ddt->ddt_checksum, &rdde->dde_key, NULL, &blk); | |
785 | dde = ddt_repair_start(ddt, &blk); | |
786 | ddt_repair_entry(ddt, dde, rdde, rio); | |
787 | ddt_repair_done(ddt, dde); | |
788 | ddt_enter(ddt); | |
789 | } | |
790 | ddt_exit(ddt); | |
791 | } | |
792 | ||
793 | static void | |
794 | ddt_sync_entry(ddt_t *ddt, ddt_entry_t *dde, dmu_tx_t *tx, uint64_t txg) | |
795 | { | |
796 | dsl_pool_t *dp = ddt->ddt_spa->spa_dsl_pool; | |
797 | ddt_phys_t *ddp = dde->dde_phys; | |
798 | ddt_key_t *ddk = &dde->dde_key; | |
799 | enum ddt_type otype = dde->dde_type; | |
800 | enum ddt_type ntype = DDT_TYPE_CURRENT; | |
801 | enum ddt_class oclass = dde->dde_class; | |
802 | enum ddt_class nclass; | |
803 | uint64_t total_refcnt = 0; | |
804 | ||
805 | ASSERT(dde->dde_loaded); | |
806 | ASSERT(!dde->dde_loading); | |
807 | ||
1c27024e | 808 | for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
d3bafe45 | 809 | ASSERT3P(dde->dde_lead_zio[p], ==, NULL); |
428870ff | 810 | if (ddp->ddp_phys_birth == 0) { |
d3bafe45 | 811 | ASSERT0(ddp->ddp_refcnt); |
428870ff BB |
812 | continue; |
813 | } | |
814 | if (p == DDT_PHYS_DITTO) { | |
050d720c MA |
815 | /* |
816 | * Note, we no longer create DDT-DITTO blocks, but we | |
817 | * don't want to leak any written by older software. | |
818 | */ | |
819 | ddt_phys_free(ddt, ddk, ddp, txg); | |
428870ff BB |
820 | continue; |
821 | } | |
822 | if (ddp->ddp_refcnt == 0) | |
823 | ddt_phys_free(ddt, ddk, ddp, txg); | |
824 | total_refcnt += ddp->ddp_refcnt; | |
825 | } | |
826 | ||
050d720c MA |
827 | /* We do not create new DDT-DITTO blocks. */ |
828 | ASSERT0(dde->dde_phys[DDT_PHYS_DITTO].ddp_phys_birth); | |
829 | if (total_refcnt > 1) | |
428870ff BB |
830 | nclass = DDT_CLASS_DUPLICATE; |
831 | else | |
832 | nclass = DDT_CLASS_UNIQUE; | |
833 | ||
834 | if (otype != DDT_TYPES && | |
835 | (otype != ntype || oclass != nclass || total_refcnt == 0)) { | |
d3bafe45 RN |
836 | VERIFY0(ddt_object_remove(ddt, otype, oclass, dde, tx)); |
837 | ASSERT3U( | |
838 | ddt_object_lookup(ddt, otype, oclass, dde), ==, ENOENT); | |
428870ff BB |
839 | } |
840 | ||
841 | if (total_refcnt != 0) { | |
842 | dde->dde_type = ntype; | |
843 | dde->dde_class = nclass; | |
844 | ddt_stat_update(ddt, dde, 0); | |
845 | if (!ddt_object_exists(ddt, ntype, nclass)) | |
846 | ddt_object_create(ddt, ntype, nclass, tx); | |
d3bafe45 | 847 | VERIFY0(ddt_object_update(ddt, ntype, nclass, dde, tx)); |
428870ff BB |
848 | |
849 | /* | |
850 | * If the class changes, the order that we scan this bp | |
851 | * changes. If it decreases, we could miss it, so | |
852 | * scan it right now. (This covers both class changing | |
853 | * while we are doing ddt_walk(), and when we are | |
854 | * traversing.) | |
855 | */ | |
856 | if (nclass < oclass) { | |
857 | dsl_scan_ddt_entry(dp->dp_scan, | |
858 | ddt->ddt_checksum, dde, tx); | |
859 | } | |
860 | } | |
861 | } | |
862 | ||
863 | static void | |
864 | ddt_sync_table(ddt_t *ddt, dmu_tx_t *tx, uint64_t txg) | |
865 | { | |
866 | spa_t *spa = ddt->ddt_spa; | |
867 | ddt_entry_t *dde; | |
868 | void *cookie = NULL; | |
869 | ||
870 | if (avl_numnodes(&ddt->ddt_tree) == 0) | |
871 | return; | |
872 | ||
d3bafe45 | 873 | ASSERT3U(spa->spa_uberblock.ub_version, >=, SPA_VERSION_DEDUP); |
428870ff BB |
874 | |
875 | if (spa->spa_ddt_stat_object == 0) { | |
9ae529ec CS |
876 | spa->spa_ddt_stat_object = zap_create_link(ddt->ddt_os, |
877 | DMU_OT_DDT_STATS, DMU_POOL_DIRECTORY_OBJECT, | |
878 | DMU_POOL_DDT_STATS, tx); | |
428870ff BB |
879 | } |
880 | ||
881 | while ((dde = avl_destroy_nodes(&ddt->ddt_tree, &cookie)) != NULL) { | |
882 | ddt_sync_entry(ddt, dde, tx, txg); | |
883 | ddt_free(dde); | |
884 | } | |
885 | ||
1c27024e | 886 | for (enum ddt_type type = 0; type < DDT_TYPES; type++) { |
e8fd45a0 | 887 | uint64_t add, count = 0; |
1c27024e | 888 | for (enum ddt_class class = 0; class < DDT_CLASSES; class++) { |
572e2857 BB |
889 | if (ddt_object_exists(ddt, type, class)) { |
890 | ddt_object_sync(ddt, type, class, tx); | |
d3bafe45 RN |
891 | VERIFY0(ddt_object_count(ddt, type, class, |
892 | &add)); | |
e8fd45a0 | 893 | count += add; |
572e2857 BB |
894 | } |
895 | } | |
1c27024e | 896 | for (enum ddt_class class = 0; class < DDT_CLASSES; class++) { |
572e2857 | 897 | if (count == 0 && ddt_object_exists(ddt, type, class)) |
428870ff BB |
898 | ddt_object_destroy(ddt, type, class, tx); |
899 | } | |
900 | } | |
901 | ||
861166b0 | 902 | memcpy(&ddt->ddt_histogram_cache, ddt->ddt_histogram, |
428870ff | 903 | sizeof (ddt->ddt_histogram)); |
e8a20144 | 904 | spa->spa_dedup_dspace = ~0ULL; |
428870ff BB |
905 | } |
906 | ||
907 | void | |
908 | ddt_sync(spa_t *spa, uint64_t txg) | |
909 | { | |
d4a72f23 | 910 | dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; |
428870ff | 911 | dmu_tx_t *tx; |
d4a72f23 | 912 | zio_t *rio; |
428870ff | 913 | |
d3bafe45 | 914 | ASSERT3U(spa_syncing_txg(spa), ==, txg); |
428870ff BB |
915 | |
916 | tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); | |
917 | ||
d4a72f23 | 918 | rio = zio_root(spa, NULL, NULL, |
a1d477c2 | 919 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SELF_HEAL); |
d4a72f23 TC |
920 | |
921 | /* | |
922 | * This function may cause an immediate scan of ddt blocks (see | |
923 | * the comment above dsl_scan_ddt() for details). We set the | |
924 | * scan's root zio here so that we can wait for any scan IOs in | |
925 | * addition to the regular ddt IOs. | |
926 | */ | |
927 | ASSERT3P(scn->scn_zio_root, ==, NULL); | |
928 | scn->scn_zio_root = rio; | |
929 | ||
1c27024e | 930 | for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { |
428870ff BB |
931 | ddt_t *ddt = spa->spa_ddt[c]; |
932 | if (ddt == NULL) | |
933 | continue; | |
934 | ddt_sync_table(ddt, tx, txg); | |
935 | ddt_repair_table(ddt, rio); | |
936 | } | |
937 | ||
938 | (void) zio_wait(rio); | |
d4a72f23 | 939 | scn->scn_zio_root = NULL; |
428870ff BB |
940 | |
941 | dmu_tx_commit(tx); | |
942 | } | |
943 | ||
944 | int | |
945 | ddt_walk(spa_t *spa, ddt_bookmark_t *ddb, ddt_entry_t *dde) | |
946 | { | |
947 | do { | |
948 | do { | |
949 | do { | |
950 | ddt_t *ddt = spa->spa_ddt[ddb->ddb_checksum]; | |
951 | int error = ENOENT; | |
952 | if (ddt_object_exists(ddt, ddb->ddb_type, | |
953 | ddb->ddb_class)) { | |
954 | error = ddt_object_walk(ddt, | |
955 | ddb->ddb_type, ddb->ddb_class, | |
956 | &ddb->ddb_cursor, dde); | |
957 | } | |
958 | dde->dde_type = ddb->ddb_type; | |
959 | dde->dde_class = ddb->ddb_class; | |
960 | if (error == 0) | |
961 | return (0); | |
962 | if (error != ENOENT) | |
963 | return (error); | |
964 | ddb->ddb_cursor = 0; | |
965 | } while (++ddb->ddb_checksum < ZIO_CHECKSUM_FUNCTIONS); | |
966 | ddb->ddb_checksum = 0; | |
967 | } while (++ddb->ddb_type < DDT_TYPES); | |
968 | ddb->ddb_type = 0; | |
969 | } while (++ddb->ddb_class < DDT_CLASSES); | |
970 | ||
2e528b49 | 971 | return (SET_ERROR(ENOENT)); |
428870ff | 972 | } |
c409e464 | 973 | |
67a1b037 PJD |
974 | /* |
975 | * This function is used by Block Cloning (brt.c) to increase reference | |
976 | * counter for the DDT entry if the block is already in DDT. | |
977 | * | |
978 | * Return false if the block, despite having the D bit set, is not present | |
979 | * in the DDT. Currently this is not possible but might be in the future. | |
980 | * See the comment below. | |
981 | */ | |
982 | boolean_t | |
983 | ddt_addref(spa_t *spa, const blkptr_t *bp) | |
984 | { | |
985 | ddt_t *ddt; | |
986 | ddt_entry_t *dde; | |
987 | boolean_t result; | |
988 | ||
989 | spa_config_enter(spa, SCL_ZIO, FTAG, RW_READER); | |
990 | ddt = ddt_select(spa, bp); | |
991 | ddt_enter(ddt); | |
992 | ||
993 | dde = ddt_lookup(ddt, bp, B_TRUE); | |
d3bafe45 | 994 | ASSERT3P(dde, !=, NULL); |
67a1b037 PJD |
995 | |
996 | if (dde->dde_type < DDT_TYPES) { | |
997 | ddt_phys_t *ddp; | |
998 | ||
999 | ASSERT3S(dde->dde_class, <, DDT_CLASSES); | |
1000 | ||
1001 | ddp = &dde->dde_phys[BP_GET_NDVAS(bp)]; | |
61ab05ca RN |
1002 | |
1003 | /* | |
1004 | * This entry already existed (dde_type is real), so it must | |
1005 | * have refcnt >0 at the start of this txg. We are called from | |
1006 | * brt_pending_apply(), before frees are issued, so the refcnt | |
1007 | * can't be lowered yet. Therefore, it must be >0. We assert | |
1008 | * this because if the order of BRT and DDT interactions were | |
1009 | * ever to change and the refcnt was ever zero here, then | |
1010 | * likely further action is required to fill out the DDT entry, | |
1011 | * and this is a place that is likely to be missed in testing. | |
1012 | */ | |
1013 | ASSERT3U(ddp->ddp_refcnt, >, 0); | |
1014 | ||
67a1b037 PJD |
1015 | ddt_phys_addref(ddp); |
1016 | result = B_TRUE; | |
1017 | } else { | |
1018 | /* | |
1019 | * At the time of implementating this if the block has the | |
1020 | * DEDUP flag set it must exist in the DEDUP table, but | |
1021 | * there are many advocates that want ability to remove | |
1022 | * entries from DDT with refcnt=1. If this will happen, | |
1023 | * we may have a block with the DEDUP set, but which doesn't | |
1024 | * have a corresponding entry in the DDT. Be ready. | |
1025 | */ | |
1026 | ASSERT3S(dde->dde_class, ==, DDT_CLASSES); | |
1027 | ddt_remove(ddt, dde); | |
1028 | result = B_FALSE; | |
1029 | } | |
1030 | ||
1031 | ddt_exit(ddt); | |
1032 | spa_config_exit(spa, SCL_ZIO, FTAG); | |
1033 | ||
1034 | return (result); | |
1035 | } | |
1036 | ||
a7929f31 | 1037 | ZFS_MODULE_PARAM(zfs_dedup, zfs_dedup_, prefetch, INT, ZMOD_RW, |
03fdcb9a | 1038 | "Enable prefetching dedup-ed blks"); |