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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 | |
9 | * or http://www.opensolaris.org/os/licensing. | |
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. |
428870ff BB |
25 | */ |
26 | ||
27 | #include <sys/zfs_context.h> | |
28 | #include <sys/spa.h> | |
29 | #include <sys/spa_impl.h> | |
30 | #include <sys/zio.h> | |
31 | #include <sys/ddt.h> | |
32 | #include <sys/zap.h> | |
33 | #include <sys/dmu_tx.h> | |
34 | #include <sys/arc.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> | |
a6255b7f | 39 | #include <sys/abd.h> |
428870ff | 40 | |
ecf3d9b8 JL |
41 | static kmem_cache_t *ddt_cache; |
42 | static kmem_cache_t *ddt_entry_cache; | |
43 | ||
572e2857 BB |
44 | /* |
45 | * Enable/disable prefetching of dedup-ed blocks which are going to be freed. | |
46 | */ | |
0dfc7324 | 47 | int zfs_dedup_prefetch = 0; |
572e2857 | 48 | |
428870ff BB |
49 | static const ddt_ops_t *ddt_ops[DDT_TYPES] = { |
50 | &ddt_zap_ops, | |
51 | }; | |
52 | ||
53 | static const char *ddt_class_name[DDT_CLASSES] = { | |
54 | "ditto", | |
55 | "duplicate", | |
56 | "unique", | |
57 | }; | |
58 | ||
59 | static void | |
60 | ddt_object_create(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
61 | dmu_tx_t *tx) | |
62 | { | |
63 | spa_t *spa = ddt->ddt_spa; | |
64 | objset_t *os = ddt->ddt_os; | |
65 | uint64_t *objectp = &ddt->ddt_object[type][class]; | |
3c67d83a TH |
66 | boolean_t prehash = zio_checksum_table[ddt->ddt_checksum].ci_flags & |
67 | ZCHECKSUM_FLAG_DEDUP; | |
428870ff BB |
68 | char name[DDT_NAMELEN]; |
69 | ||
70 | ddt_object_name(ddt, type, class, name); | |
71 | ||
72 | ASSERT(*objectp == 0); | |
73 | VERIFY(ddt_ops[type]->ddt_op_create(os, objectp, tx, prehash) == 0); | |
74 | ASSERT(*objectp != 0); | |
75 | ||
76 | VERIFY(zap_add(os, DMU_POOL_DIRECTORY_OBJECT, name, | |
77 | sizeof (uint64_t), 1, objectp, tx) == 0); | |
78 | ||
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); | |
82 | } | |
83 | ||
84 | static void | |
85 | ddt_object_destroy(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
86 | dmu_tx_t *tx) | |
87 | { | |
88 | spa_t *spa = ddt->ddt_spa; | |
89 | objset_t *os = ddt->ddt_os; | |
90 | uint64_t *objectp = &ddt->ddt_object[type][class]; | |
e8fd45a0 | 91 | uint64_t count; |
428870ff BB |
92 | char name[DDT_NAMELEN]; |
93 | ||
94 | ddt_object_name(ddt, type, class, name); | |
95 | ||
96 | ASSERT(*objectp != 0); | |
428870ff | 97 | ASSERT(ddt_histogram_empty(&ddt->ddt_histogram[type][class])); |
e8fd45a0 | 98 | VERIFY(ddt_object_count(ddt, type, class, &count) == 0 && count == 0); |
428870ff BB |
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)); | |
103 | ||
104 | *objectp = 0; | |
105 | } | |
106 | ||
107 | static int | |
108 | ddt_object_load(ddt_t *ddt, enum ddt_type type, enum ddt_class class) | |
109 | { | |
110 | ddt_object_t *ddo = &ddt->ddt_object_stats[type][class]; | |
111 | dmu_object_info_t doi; | |
e8fd45a0 | 112 | uint64_t count; |
428870ff BB |
113 | char name[DDT_NAMELEN]; |
114 | int error; | |
115 | ||
116 | ddt_object_name(ddt, type, class, name); | |
117 | ||
118 | error = zap_lookup(ddt->ddt_os, DMU_POOL_DIRECTORY_OBJECT, name, | |
119 | sizeof (uint64_t), 1, &ddt->ddt_object[type][class]); | |
b0bc7a84 | 120 | if (error != 0) |
428870ff BB |
121 | return (error); |
122 | ||
ff9b1d07 | 123 | error = zap_lookup(ddt->ddt_os, ddt->ddt_spa->spa_ddt_stat_object, name, |
428870ff | 124 | sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t), |
ff9b1d07 BB |
125 | &ddt->ddt_histogram[type][class]); |
126 | if (error != 0) | |
127 | return (error); | |
428870ff BB |
128 | |
129 | /* | |
130 | * Seed the cached statistics. | |
131 | */ | |
2a4a9dc2 BB |
132 | error = ddt_object_info(ddt, type, class, &doi); |
133 | if (error) | |
134 | return (error); | |
428870ff | 135 | |
e8fd45a0 BB |
136 | error = ddt_object_count(ddt, type, class, &count); |
137 | if (error) | |
138 | return (error); | |
139 | ||
140 | ddo->ddo_count = count; | |
428870ff BB |
141 | ddo->ddo_dspace = doi.doi_physical_blocks_512 << 9; |
142 | ddo->ddo_mspace = doi.doi_fill_count * doi.doi_data_block_size; | |
143 | ||
b0bc7a84 | 144 | return (0); |
428870ff BB |
145 | } |
146 | ||
147 | static void | |
148 | ddt_object_sync(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
149 | dmu_tx_t *tx) | |
150 | { | |
151 | ddt_object_t *ddo = &ddt->ddt_object_stats[type][class]; | |
152 | dmu_object_info_t doi; | |
e8fd45a0 | 153 | uint64_t count; |
428870ff BB |
154 | char name[DDT_NAMELEN]; |
155 | ||
156 | ddt_object_name(ddt, type, class, name); | |
157 | ||
158 | VERIFY(zap_update(ddt->ddt_os, ddt->ddt_spa->spa_ddt_stat_object, name, | |
159 | sizeof (uint64_t), sizeof (ddt_histogram_t) / sizeof (uint64_t), | |
160 | &ddt->ddt_histogram[type][class], tx) == 0); | |
161 | ||
162 | /* | |
163 | * Cache DDT statistics; this is the only time they'll change. | |
164 | */ | |
165 | VERIFY(ddt_object_info(ddt, type, class, &doi) == 0); | |
e8fd45a0 | 166 | VERIFY(ddt_object_count(ddt, type, class, &count) == 0); |
428870ff | 167 | |
e8fd45a0 | 168 | ddo->ddo_count = count; |
428870ff BB |
169 | ddo->ddo_dspace = doi.doi_physical_blocks_512 << 9; |
170 | ddo->ddo_mspace = doi.doi_fill_count * doi.doi_data_block_size; | |
171 | } | |
172 | ||
173 | static int | |
174 | ddt_object_lookup(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
175 | ddt_entry_t *dde) | |
176 | { | |
177 | if (!ddt_object_exists(ddt, type, class)) | |
2e528b49 | 178 | return (SET_ERROR(ENOENT)); |
428870ff BB |
179 | |
180 | return (ddt_ops[type]->ddt_op_lookup(ddt->ddt_os, | |
181 | ddt->ddt_object[type][class], dde)); | |
182 | } | |
183 | ||
184 | static void | |
185 | ddt_object_prefetch(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
186 | ddt_entry_t *dde) | |
187 | { | |
188 | if (!ddt_object_exists(ddt, type, class)) | |
189 | return; | |
190 | ||
191 | ddt_ops[type]->ddt_op_prefetch(ddt->ddt_os, | |
192 | ddt->ddt_object[type][class], dde); | |
193 | } | |
194 | ||
195 | int | |
196 | ddt_object_update(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
197 | ddt_entry_t *dde, dmu_tx_t *tx) | |
198 | { | |
199 | ASSERT(ddt_object_exists(ddt, type, class)); | |
200 | ||
201 | return (ddt_ops[type]->ddt_op_update(ddt->ddt_os, | |
202 | ddt->ddt_object[type][class], dde, tx)); | |
203 | } | |
204 | ||
205 | static int | |
206 | ddt_object_remove(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
207 | ddt_entry_t *dde, dmu_tx_t *tx) | |
208 | { | |
209 | ASSERT(ddt_object_exists(ddt, type, class)); | |
210 | ||
211 | return (ddt_ops[type]->ddt_op_remove(ddt->ddt_os, | |
212 | ddt->ddt_object[type][class], dde, tx)); | |
213 | } | |
214 | ||
215 | int | |
216 | ddt_object_walk(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
217 | uint64_t *walk, ddt_entry_t *dde) | |
218 | { | |
219 | ASSERT(ddt_object_exists(ddt, type, class)); | |
220 | ||
221 | return (ddt_ops[type]->ddt_op_walk(ddt->ddt_os, | |
222 | ddt->ddt_object[type][class], dde, walk)); | |
223 | } | |
224 | ||
e8fd45a0 BB |
225 | int |
226 | ddt_object_count(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
227 | uint64_t *count) | |
428870ff BB |
228 | { |
229 | ASSERT(ddt_object_exists(ddt, type, class)); | |
230 | ||
231 | return (ddt_ops[type]->ddt_op_count(ddt->ddt_os, | |
e8fd45a0 | 232 | ddt->ddt_object[type][class], count)); |
428870ff BB |
233 | } |
234 | ||
235 | int | |
236 | ddt_object_info(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
237 | dmu_object_info_t *doi) | |
238 | { | |
239 | if (!ddt_object_exists(ddt, type, class)) | |
2e528b49 | 240 | return (SET_ERROR(ENOENT)); |
428870ff BB |
241 | |
242 | return (dmu_object_info(ddt->ddt_os, ddt->ddt_object[type][class], | |
243 | doi)); | |
244 | } | |
245 | ||
246 | boolean_t | |
247 | ddt_object_exists(ddt_t *ddt, enum ddt_type type, enum ddt_class class) | |
248 | { | |
249 | return (!!ddt->ddt_object[type][class]); | |
250 | } | |
251 | ||
252 | void | |
253 | ddt_object_name(ddt_t *ddt, enum ddt_type type, enum ddt_class class, | |
254 | char *name) | |
255 | { | |
256 | (void) sprintf(name, DMU_POOL_DDT, | |
257 | zio_checksum_table[ddt->ddt_checksum].ci_name, | |
258 | ddt_ops[type]->ddt_op_name, ddt_class_name[class]); | |
259 | } | |
260 | ||
261 | void | |
262 | ddt_bp_fill(const ddt_phys_t *ddp, blkptr_t *bp, uint64_t txg) | |
263 | { | |
264 | ASSERT(txg != 0); | |
265 | ||
1c27024e | 266 | for (int d = 0; d < SPA_DVAS_PER_BP; d++) |
428870ff BB |
267 | bp->blk_dva[d] = ddp->ddp_dva[d]; |
268 | BP_SET_BIRTH(bp, txg, ddp->ddp_phys_birth); | |
269 | } | |
270 | ||
b5256303 TC |
271 | /* |
272 | * The bp created via this function may be used for repairs and scrub, but it | |
273 | * will be missing the salt / IV required to do a full decrypting read. | |
274 | */ | |
428870ff BB |
275 | void |
276 | ddt_bp_create(enum zio_checksum checksum, | |
277 | const ddt_key_t *ddk, const ddt_phys_t *ddp, blkptr_t *bp) | |
278 | { | |
279 | BP_ZERO(bp); | |
280 | ||
281 | if (ddp != NULL) | |
282 | ddt_bp_fill(ddp, bp, ddp->ddp_phys_birth); | |
283 | ||
284 | bp->blk_cksum = ddk->ddk_cksum; | |
428870ff BB |
285 | |
286 | BP_SET_LSIZE(bp, DDK_GET_LSIZE(ddk)); | |
287 | BP_SET_PSIZE(bp, DDK_GET_PSIZE(ddk)); | |
288 | BP_SET_COMPRESS(bp, DDK_GET_COMPRESS(ddk)); | |
b5256303 TC |
289 | BP_SET_CRYPT(bp, DDK_GET_CRYPT(ddk)); |
290 | BP_SET_FILL(bp, 1); | |
428870ff BB |
291 | BP_SET_CHECKSUM(bp, checksum); |
292 | BP_SET_TYPE(bp, DMU_OT_DEDUP); | |
293 | BP_SET_LEVEL(bp, 0); | |
52b68423 | 294 | BP_SET_DEDUP(bp, 1); |
428870ff BB |
295 | BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); |
296 | } | |
297 | ||
298 | void | |
299 | ddt_key_fill(ddt_key_t *ddk, const blkptr_t *bp) | |
300 | { | |
301 | ddk->ddk_cksum = bp->blk_cksum; | |
302 | ddk->ddk_prop = 0; | |
303 | ||
b5256303 TC |
304 | ASSERT(BP_IS_ENCRYPTED(bp) || !BP_USES_CRYPT(bp)); |
305 | ||
428870ff BB |
306 | DDK_SET_LSIZE(ddk, BP_GET_LSIZE(bp)); |
307 | DDK_SET_PSIZE(ddk, BP_GET_PSIZE(bp)); | |
308 | DDK_SET_COMPRESS(ddk, BP_GET_COMPRESS(bp)); | |
b5256303 | 309 | DDK_SET_CRYPT(ddk, BP_USES_CRYPT(bp)); |
428870ff BB |
310 | } |
311 | ||
312 | void | |
313 | ddt_phys_fill(ddt_phys_t *ddp, const blkptr_t *bp) | |
314 | { | |
315 | ASSERT(ddp->ddp_phys_birth == 0); | |
316 | ||
1c27024e | 317 | for (int d = 0; d < SPA_DVAS_PER_BP; d++) |
428870ff BB |
318 | ddp->ddp_dva[d] = bp->blk_dva[d]; |
319 | ddp->ddp_phys_birth = BP_PHYSICAL_BIRTH(bp); | |
320 | } | |
321 | ||
322 | void | |
323 | ddt_phys_clear(ddt_phys_t *ddp) | |
324 | { | |
325 | bzero(ddp, sizeof (*ddp)); | |
326 | } | |
327 | ||
328 | void | |
329 | ddt_phys_addref(ddt_phys_t *ddp) | |
330 | { | |
331 | ddp->ddp_refcnt++; | |
332 | } | |
333 | ||
334 | void | |
335 | ddt_phys_decref(ddt_phys_t *ddp) | |
336 | { | |
5dc6af0e | 337 | if (ddp) { |
ee664d46 | 338 | ASSERT(ddp->ddp_refcnt > 0); |
5dc6af0e BB |
339 | ddp->ddp_refcnt--; |
340 | } | |
428870ff BB |
341 | } |
342 | ||
343 | void | |
344 | ddt_phys_free(ddt_t *ddt, ddt_key_t *ddk, ddt_phys_t *ddp, uint64_t txg) | |
345 | { | |
346 | blkptr_t blk; | |
347 | ||
348 | ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk); | |
52b68423 BB |
349 | |
350 | /* | |
351 | * We clear the dedup bit so that zio_free() will actually free the | |
352 | * space, rather than just decrementing the refcount in the DDT. | |
353 | */ | |
354 | BP_SET_DEDUP(&blk, 0); | |
355 | ||
428870ff BB |
356 | ddt_phys_clear(ddp); |
357 | zio_free(ddt->ddt_spa, txg, &blk); | |
358 | } | |
359 | ||
360 | ddt_phys_t * | |
361 | ddt_phys_select(const ddt_entry_t *dde, const blkptr_t *bp) | |
362 | { | |
363 | ddt_phys_t *ddp = (ddt_phys_t *)dde->dde_phys; | |
364 | ||
1c27024e | 365 | for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
428870ff BB |
366 | if (DVA_EQUAL(BP_IDENTITY(bp), &ddp->ddp_dva[0]) && |
367 | BP_PHYSICAL_BIRTH(bp) == ddp->ddp_phys_birth) | |
368 | return (ddp); | |
369 | } | |
370 | return (NULL); | |
371 | } | |
372 | ||
373 | uint64_t | |
374 | ddt_phys_total_refcnt(const ddt_entry_t *dde) | |
375 | { | |
376 | uint64_t refcnt = 0; | |
377 | ||
1c27024e | 378 | for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) |
428870ff BB |
379 | refcnt += dde->dde_phys[p].ddp_refcnt; |
380 | ||
381 | return (refcnt); | |
382 | } | |
383 | ||
384 | static void | |
385 | ddt_stat_generate(ddt_t *ddt, ddt_entry_t *dde, ddt_stat_t *dds) | |
386 | { | |
387 | spa_t *spa = ddt->ddt_spa; | |
388 | ddt_phys_t *ddp = dde->dde_phys; | |
389 | ddt_key_t *ddk = &dde->dde_key; | |
390 | uint64_t lsize = DDK_GET_LSIZE(ddk); | |
391 | uint64_t psize = DDK_GET_PSIZE(ddk); | |
392 | ||
393 | bzero(dds, sizeof (*dds)); | |
394 | ||
1c27024e | 395 | for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
428870ff BB |
396 | uint64_t dsize = 0; |
397 | uint64_t refcnt = ddp->ddp_refcnt; | |
398 | ||
399 | if (ddp->ddp_phys_birth == 0) | |
400 | continue; | |
401 | ||
1c27024e | 402 | for (int d = 0; d < DDE_GET_NDVAS(dde); d++) |
428870ff BB |
403 | dsize += dva_get_dsize_sync(spa, &ddp->ddp_dva[d]); |
404 | ||
405 | dds->dds_blocks += 1; | |
406 | dds->dds_lsize += lsize; | |
407 | dds->dds_psize += psize; | |
408 | dds->dds_dsize += dsize; | |
409 | ||
410 | dds->dds_ref_blocks += refcnt; | |
411 | dds->dds_ref_lsize += lsize * refcnt; | |
412 | dds->dds_ref_psize += psize * refcnt; | |
413 | dds->dds_ref_dsize += dsize * refcnt; | |
414 | } | |
415 | } | |
416 | ||
417 | void | |
418 | ddt_stat_add(ddt_stat_t *dst, const ddt_stat_t *src, uint64_t neg) | |
419 | { | |
420 | const uint64_t *s = (const uint64_t *)src; | |
421 | uint64_t *d = (uint64_t *)dst; | |
422 | uint64_t *d_end = (uint64_t *)(dst + 1); | |
423 | ||
424 | ASSERT(neg == 0 || neg == -1ULL); /* add or subtract */ | |
425 | ||
426 | while (d < d_end) | |
427 | *d++ += (*s++ ^ neg) - neg; | |
428 | } | |
429 | ||
430 | static void | |
431 | ddt_stat_update(ddt_t *ddt, ddt_entry_t *dde, uint64_t neg) | |
432 | { | |
433 | ddt_stat_t dds; | |
434 | ddt_histogram_t *ddh; | |
435 | int bucket; | |
436 | ||
437 | ddt_stat_generate(ddt, dde, &dds); | |
438 | ||
9bd274dd | 439 | bucket = highbit64(dds.dds_ref_blocks) - 1; |
428870ff BB |
440 | ASSERT(bucket >= 0); |
441 | ||
442 | ddh = &ddt->ddt_histogram[dde->dde_type][dde->dde_class]; | |
443 | ||
444 | ddt_stat_add(&ddh->ddh_stat[bucket], &dds, neg); | |
445 | } | |
446 | ||
447 | void | |
448 | ddt_histogram_add(ddt_histogram_t *dst, const ddt_histogram_t *src) | |
449 | { | |
1c27024e | 450 | for (int h = 0; h < 64; h++) |
428870ff BB |
451 | ddt_stat_add(&dst->ddh_stat[h], &src->ddh_stat[h], 0); |
452 | } | |
453 | ||
454 | void | |
455 | ddt_histogram_stat(ddt_stat_t *dds, const ddt_histogram_t *ddh) | |
456 | { | |
457 | bzero(dds, sizeof (*dds)); | |
458 | ||
1c27024e | 459 | for (int h = 0; h < 64; h++) |
428870ff BB |
460 | ddt_stat_add(dds, &ddh->ddh_stat[h], 0); |
461 | } | |
462 | ||
463 | boolean_t | |
464 | ddt_histogram_empty(const ddt_histogram_t *ddh) | |
465 | { | |
466 | const uint64_t *s = (const uint64_t *)ddh; | |
467 | const uint64_t *s_end = (const uint64_t *)(ddh + 1); | |
468 | ||
469 | while (s < s_end) | |
470 | if (*s++ != 0) | |
471 | return (B_FALSE); | |
472 | ||
473 | return (B_TRUE); | |
474 | } | |
475 | ||
476 | void | |
477 | ddt_get_dedup_object_stats(spa_t *spa, ddt_object_t *ddo_total) | |
478 | { | |
479 | /* Sum the statistics we cached in ddt_object_sync(). */ | |
1c27024e | 480 | for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { |
428870ff | 481 | ddt_t *ddt = spa->spa_ddt[c]; |
1c27024e DB |
482 | for (enum ddt_type type = 0; type < DDT_TYPES; type++) { |
483 | for (enum ddt_class class = 0; class < DDT_CLASSES; | |
428870ff BB |
484 | class++) { |
485 | ddt_object_t *ddo = | |
486 | &ddt->ddt_object_stats[type][class]; | |
487 | ddo_total->ddo_count += ddo->ddo_count; | |
488 | ddo_total->ddo_dspace += ddo->ddo_dspace; | |
489 | ddo_total->ddo_mspace += ddo->ddo_mspace; | |
490 | } | |
491 | } | |
492 | } | |
493 | ||
494 | /* ... and compute the averages. */ | |
495 | if (ddo_total->ddo_count != 0) { | |
496 | ddo_total->ddo_dspace /= ddo_total->ddo_count; | |
497 | ddo_total->ddo_mspace /= ddo_total->ddo_count; | |
428870ff BB |
498 | } |
499 | } | |
500 | ||
501 | void | |
502 | ddt_get_dedup_histogram(spa_t *spa, ddt_histogram_t *ddh) | |
503 | { | |
1c27024e | 504 | for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { |
428870ff | 505 | ddt_t *ddt = spa->spa_ddt[c]; |
1c27024e DB |
506 | for (enum ddt_type type = 0; type < DDT_TYPES; type++) { |
507 | for (enum ddt_class class = 0; class < DDT_CLASSES; | |
428870ff BB |
508 | class++) { |
509 | ddt_histogram_add(ddh, | |
510 | &ddt->ddt_histogram_cache[type][class]); | |
511 | } | |
512 | } | |
513 | } | |
514 | } | |
515 | ||
516 | void | |
517 | ddt_get_dedup_stats(spa_t *spa, ddt_stat_t *dds_total) | |
518 | { | |
519 | ddt_histogram_t *ddh_total; | |
520 | ||
79c76d5b | 521 | ddh_total = kmem_zalloc(sizeof (ddt_histogram_t), KM_SLEEP); |
428870ff BB |
522 | ddt_get_dedup_histogram(spa, ddh_total); |
523 | ddt_histogram_stat(dds_total, ddh_total); | |
524 | kmem_free(ddh_total, sizeof (ddt_histogram_t)); | |
525 | } | |
526 | ||
527 | uint64_t | |
528 | ddt_get_dedup_dspace(spa_t *spa) | |
529 | { | |
e8a20144 GN |
530 | ddt_stat_t dds_total; |
531 | ||
532 | if (spa->spa_dedup_dspace != ~0ULL) | |
533 | return (spa->spa_dedup_dspace); | |
534 | ||
535 | bzero(&dds_total, sizeof (ddt_stat_t)); | |
428870ff | 536 | |
e8a20144 | 537 | /* Calculate and cache the stats */ |
428870ff | 538 | ddt_get_dedup_stats(spa, &dds_total); |
e8a20144 GN |
539 | spa->spa_dedup_dspace = dds_total.dds_ref_dsize - dds_total.dds_dsize; |
540 | return (spa->spa_dedup_dspace); | |
428870ff BB |
541 | } |
542 | ||
543 | uint64_t | |
544 | ddt_get_pool_dedup_ratio(spa_t *spa) | |
545 | { | |
546 | ddt_stat_t dds_total = { 0 }; | |
547 | ||
548 | ddt_get_dedup_stats(spa, &dds_total); | |
549 | if (dds_total.dds_dsize == 0) | |
550 | return (100); | |
551 | ||
552 | return (dds_total.dds_ref_dsize * 100 / dds_total.dds_dsize); | |
553 | } | |
554 | ||
428870ff BB |
555 | size_t |
556 | ddt_compress(void *src, uchar_t *dst, size_t s_len, size_t d_len) | |
557 | { | |
558 | uchar_t *version = dst++; | |
559 | int cpfunc = ZIO_COMPRESS_ZLE; | |
560 | zio_compress_info_t *ci = &zio_compress_table[cpfunc]; | |
561 | size_t c_len; | |
562 | ||
563 | ASSERT(d_len >= s_len + 1); /* no compression plus version byte */ | |
564 | ||
565 | c_len = ci->ci_compress(src, dst, s_len, d_len - 1, ci->ci_level); | |
566 | ||
567 | if (c_len == s_len) { | |
568 | cpfunc = ZIO_COMPRESS_OFF; | |
569 | bcopy(src, dst, s_len); | |
570 | } | |
571 | ||
b0bc7a84 MG |
572 | *version = cpfunc; |
573 | /* CONSTCOND */ | |
574 | if (ZFS_HOST_BYTEORDER) | |
575 | *version |= DDT_COMPRESS_BYTEORDER_MASK; | |
428870ff BB |
576 | |
577 | return (c_len + 1); | |
578 | } | |
579 | ||
580 | void | |
581 | ddt_decompress(uchar_t *src, void *dst, size_t s_len, size_t d_len) | |
582 | { | |
583 | uchar_t version = *src++; | |
584 | int cpfunc = version & DDT_COMPRESS_FUNCTION_MASK; | |
585 | zio_compress_info_t *ci = &zio_compress_table[cpfunc]; | |
586 | ||
587 | if (ci->ci_decompress != NULL) | |
588 | (void) ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level); | |
589 | else | |
590 | bcopy(src, dst, d_len); | |
591 | ||
b0bc7a84 MG |
592 | if (((version & DDT_COMPRESS_BYTEORDER_MASK) != 0) != |
593 | (ZFS_HOST_BYTEORDER != 0)) | |
428870ff BB |
594 | byteswap_uint64_array(dst, d_len); |
595 | } | |
596 | ||
597 | ddt_t * | |
598 | ddt_select_by_checksum(spa_t *spa, enum zio_checksum c) | |
599 | { | |
600 | return (spa->spa_ddt[c]); | |
601 | } | |
602 | ||
603 | ddt_t * | |
604 | ddt_select(spa_t *spa, const blkptr_t *bp) | |
605 | { | |
606 | return (spa->spa_ddt[BP_GET_CHECKSUM(bp)]); | |
607 | } | |
608 | ||
609 | void | |
610 | ddt_enter(ddt_t *ddt) | |
611 | { | |
612 | mutex_enter(&ddt->ddt_lock); | |
613 | } | |
614 | ||
615 | void | |
616 | ddt_exit(ddt_t *ddt) | |
617 | { | |
618 | mutex_exit(&ddt->ddt_lock); | |
619 | } | |
620 | ||
ecf3d9b8 JL |
621 | void |
622 | ddt_init(void) | |
623 | { | |
624 | ddt_cache = kmem_cache_create("ddt_cache", | |
625 | sizeof (ddt_t), 0, NULL, NULL, NULL, NULL, NULL, 0); | |
626 | ddt_entry_cache = kmem_cache_create("ddt_entry_cache", | |
627 | sizeof (ddt_entry_t), 0, NULL, NULL, NULL, NULL, NULL, 0); | |
628 | } | |
629 | ||
630 | void | |
631 | ddt_fini(void) | |
632 | { | |
633 | kmem_cache_destroy(ddt_entry_cache); | |
634 | kmem_cache_destroy(ddt_cache); | |
635 | } | |
636 | ||
428870ff BB |
637 | static ddt_entry_t * |
638 | ddt_alloc(const ddt_key_t *ddk) | |
639 | { | |
640 | ddt_entry_t *dde; | |
641 | ||
79c76d5b | 642 | dde = kmem_cache_alloc(ddt_entry_cache, KM_SLEEP); |
ecf3d9b8 | 643 | bzero(dde, sizeof (ddt_entry_t)); |
428870ff BB |
644 | cv_init(&dde->dde_cv, NULL, CV_DEFAULT, NULL); |
645 | ||
646 | dde->dde_key = *ddk; | |
647 | ||
648 | return (dde); | |
649 | } | |
650 | ||
651 | static void | |
652 | ddt_free(ddt_entry_t *dde) | |
653 | { | |
654 | ASSERT(!dde->dde_loading); | |
655 | ||
1c27024e | 656 | for (int p = 0; p < DDT_PHYS_TYPES; p++) |
428870ff BB |
657 | ASSERT(dde->dde_lead_zio[p] == NULL); |
658 | ||
a6255b7f DQ |
659 | if (dde->dde_repair_abd != NULL) |
660 | abd_free(dde->dde_repair_abd); | |
428870ff BB |
661 | |
662 | cv_destroy(&dde->dde_cv); | |
ecf3d9b8 | 663 | kmem_cache_free(ddt_entry_cache, dde); |
428870ff BB |
664 | } |
665 | ||
666 | void | |
667 | ddt_remove(ddt_t *ddt, ddt_entry_t *dde) | |
668 | { | |
669 | ASSERT(MUTEX_HELD(&ddt->ddt_lock)); | |
670 | ||
671 | avl_remove(&ddt->ddt_tree, dde); | |
672 | ddt_free(dde); | |
673 | } | |
674 | ||
675 | ddt_entry_t * | |
676 | ddt_lookup(ddt_t *ddt, const blkptr_t *bp, boolean_t add) | |
677 | { | |
678 | ddt_entry_t *dde, dde_search; | |
679 | enum ddt_type type; | |
680 | enum ddt_class class; | |
681 | avl_index_t where; | |
682 | int error; | |
683 | ||
684 | ASSERT(MUTEX_HELD(&ddt->ddt_lock)); | |
685 | ||
686 | ddt_key_fill(&dde_search.dde_key, bp); | |
687 | ||
688 | dde = avl_find(&ddt->ddt_tree, &dde_search, &where); | |
689 | if (dde == NULL) { | |
690 | if (!add) | |
691 | return (NULL); | |
692 | dde = ddt_alloc(&dde_search.dde_key); | |
693 | avl_insert(&ddt->ddt_tree, dde, where); | |
694 | } | |
695 | ||
696 | while (dde->dde_loading) | |
697 | cv_wait(&dde->dde_cv, &ddt->ddt_lock); | |
698 | ||
699 | if (dde->dde_loaded) | |
700 | return (dde); | |
701 | ||
702 | dde->dde_loading = B_TRUE; | |
703 | ||
704 | ddt_exit(ddt); | |
705 | ||
706 | error = ENOENT; | |
707 | ||
708 | for (type = 0; type < DDT_TYPES; type++) { | |
709 | for (class = 0; class < DDT_CLASSES; class++) { | |
710 | error = ddt_object_lookup(ddt, type, class, dde); | |
a1d477c2 MA |
711 | if (error != ENOENT) { |
712 | ASSERT0(error); | |
428870ff | 713 | break; |
a1d477c2 | 714 | } |
428870ff BB |
715 | } |
716 | if (error != ENOENT) | |
717 | break; | |
718 | } | |
719 | ||
428870ff BB |
720 | ddt_enter(ddt); |
721 | ||
722 | ASSERT(dde->dde_loaded == B_FALSE); | |
723 | ASSERT(dde->dde_loading == B_TRUE); | |
724 | ||
725 | dde->dde_type = type; /* will be DDT_TYPES if no entry found */ | |
726 | dde->dde_class = class; /* will be DDT_CLASSES if no entry found */ | |
727 | dde->dde_loaded = B_TRUE; | |
728 | dde->dde_loading = B_FALSE; | |
729 | ||
730 | if (error == 0) | |
731 | ddt_stat_update(ddt, dde, -1ULL); | |
732 | ||
733 | cv_broadcast(&dde->dde_cv); | |
734 | ||
735 | return (dde); | |
736 | } | |
737 | ||
738 | void | |
739 | ddt_prefetch(spa_t *spa, const blkptr_t *bp) | |
740 | { | |
741 | ddt_t *ddt; | |
742 | ddt_entry_t dde; | |
743 | ||
572e2857 | 744 | if (!zfs_dedup_prefetch || bp == NULL || !BP_GET_DEDUP(bp)) |
428870ff BB |
745 | return; |
746 | ||
747 | /* | |
572e2857 BB |
748 | * We only remove the DDT once all tables are empty and only |
749 | * prefetch dedup blocks when there are entries in the DDT. | |
750 | * Thus no locking is required as the DDT can't disappear on us. | |
428870ff BB |
751 | */ |
752 | ddt = ddt_select(spa, bp); | |
753 | ddt_key_fill(&dde.dde_key, bp); | |
754 | ||
1c27024e DB |
755 | for (enum ddt_type type = 0; type < DDT_TYPES; type++) { |
756 | for (enum ddt_class class = 0; class < DDT_CLASSES; class++) { | |
428870ff BB |
757 | ddt_object_prefetch(ddt, type, class, &dde); |
758 | } | |
759 | } | |
760 | } | |
761 | ||
ee36c709 GN |
762 | /* |
763 | * Opaque struct used for ddt_key comparison | |
764 | */ | |
765 | #define DDT_KEY_CMP_LEN (sizeof (ddt_key_t) / sizeof (uint16_t)) | |
766 | ||
767 | typedef struct ddt_key_cmp { | |
768 | uint16_t u16[DDT_KEY_CMP_LEN]; | |
769 | } ddt_key_cmp_t; | |
770 | ||
428870ff BB |
771 | int |
772 | ddt_entry_compare(const void *x1, const void *x2) | |
773 | { | |
774 | const ddt_entry_t *dde1 = x1; | |
775 | const ddt_entry_t *dde2 = x2; | |
ee36c709 GN |
776 | const ddt_key_cmp_t *k1 = (const ddt_key_cmp_t *)&dde1->dde_key; |
777 | const ddt_key_cmp_t *k2 = (const ddt_key_cmp_t *)&dde2->dde_key; | |
778 | int32_t cmp = 0; | |
428870ff | 779 | |
1c27024e | 780 | for (int i = 0; i < DDT_KEY_CMP_LEN; i++) { |
ee36c709 GN |
781 | cmp = (int32_t)k1->u16[i] - (int32_t)k2->u16[i]; |
782 | if (likely(cmp)) | |
783 | break; | |
428870ff BB |
784 | } |
785 | ||
ee36c709 | 786 | return (AVL_ISIGN(cmp)); |
428870ff BB |
787 | } |
788 | ||
789 | static ddt_t * | |
790 | ddt_table_alloc(spa_t *spa, enum zio_checksum c) | |
791 | { | |
792 | ddt_t *ddt; | |
793 | ||
79c76d5b | 794 | ddt = kmem_cache_alloc(ddt_cache, KM_SLEEP); |
ecf3d9b8 | 795 | bzero(ddt, sizeof (ddt_t)); |
428870ff BB |
796 | |
797 | mutex_init(&ddt->ddt_lock, NULL, MUTEX_DEFAULT, NULL); | |
798 | avl_create(&ddt->ddt_tree, ddt_entry_compare, | |
799 | sizeof (ddt_entry_t), offsetof(ddt_entry_t, dde_node)); | |
800 | avl_create(&ddt->ddt_repair_tree, ddt_entry_compare, | |
801 | sizeof (ddt_entry_t), offsetof(ddt_entry_t, dde_node)); | |
802 | ddt->ddt_checksum = c; | |
803 | ddt->ddt_spa = spa; | |
804 | ddt->ddt_os = spa->spa_meta_objset; | |
805 | ||
806 | return (ddt); | |
807 | } | |
808 | ||
809 | static void | |
810 | ddt_table_free(ddt_t *ddt) | |
811 | { | |
812 | ASSERT(avl_numnodes(&ddt->ddt_tree) == 0); | |
813 | ASSERT(avl_numnodes(&ddt->ddt_repair_tree) == 0); | |
814 | avl_destroy(&ddt->ddt_tree); | |
815 | avl_destroy(&ddt->ddt_repair_tree); | |
816 | mutex_destroy(&ddt->ddt_lock); | |
ecf3d9b8 | 817 | kmem_cache_free(ddt_cache, ddt); |
428870ff BB |
818 | } |
819 | ||
820 | void | |
821 | ddt_create(spa_t *spa) | |
822 | { | |
823 | spa->spa_dedup_checksum = ZIO_DEDUPCHECKSUM; | |
824 | ||
1c27024e | 825 | for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) |
428870ff BB |
826 | spa->spa_ddt[c] = ddt_table_alloc(spa, c); |
827 | } | |
828 | ||
829 | int | |
830 | ddt_load(spa_t *spa) | |
831 | { | |
832 | int error; | |
833 | ||
834 | ddt_create(spa); | |
835 | ||
836 | error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
837 | DMU_POOL_DDT_STATS, sizeof (uint64_t), 1, | |
838 | &spa->spa_ddt_stat_object); | |
839 | ||
840 | if (error) | |
841 | return (error == ENOENT ? 0 : error); | |
842 | ||
1c27024e | 843 | for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { |
428870ff | 844 | ddt_t *ddt = spa->spa_ddt[c]; |
1c27024e DB |
845 | for (enum ddt_type type = 0; type < DDT_TYPES; type++) { |
846 | for (enum ddt_class class = 0; class < DDT_CLASSES; | |
428870ff BB |
847 | class++) { |
848 | error = ddt_object_load(ddt, type, class); | |
849 | if (error != 0 && error != ENOENT) | |
850 | return (error); | |
851 | } | |
852 | } | |
853 | ||
854 | /* | |
855 | * Seed the cached histograms. | |
856 | */ | |
857 | bcopy(ddt->ddt_histogram, &ddt->ddt_histogram_cache, | |
858 | sizeof (ddt->ddt_histogram)); | |
e8a20144 | 859 | spa->spa_dedup_dspace = ~0ULL; |
428870ff BB |
860 | } |
861 | ||
862 | return (0); | |
863 | } | |
864 | ||
865 | void | |
866 | ddt_unload(spa_t *spa) | |
867 | { | |
1c27024e | 868 | for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { |
428870ff BB |
869 | if (spa->spa_ddt[c]) { |
870 | ddt_table_free(spa->spa_ddt[c]); | |
871 | spa->spa_ddt[c] = NULL; | |
872 | } | |
873 | } | |
874 | } | |
875 | ||
876 | boolean_t | |
877 | ddt_class_contains(spa_t *spa, enum ddt_class max_class, const blkptr_t *bp) | |
878 | { | |
879 | ddt_t *ddt; | |
e95b3bdc | 880 | ddt_entry_t *dde; |
428870ff BB |
881 | |
882 | if (!BP_GET_DEDUP(bp)) | |
883 | return (B_FALSE); | |
884 | ||
885 | if (max_class == DDT_CLASS_UNIQUE) | |
886 | return (B_TRUE); | |
887 | ||
888 | ddt = spa->spa_ddt[BP_GET_CHECKSUM(bp)]; | |
79c76d5b | 889 | dde = kmem_cache_alloc(ddt_entry_cache, KM_SLEEP); |
428870ff | 890 | |
e95b3bdc | 891 | ddt_key_fill(&(dde->dde_key), bp); |
428870ff | 892 | |
1c27024e DB |
893 | for (enum ddt_type type = 0; type < DDT_TYPES; type++) { |
894 | for (enum ddt_class class = 0; class <= max_class; class++) { | |
e95b3bdc | 895 | if (ddt_object_lookup(ddt, type, class, dde) == 0) { |
ecf3d9b8 | 896 | kmem_cache_free(ddt_entry_cache, dde); |
428870ff | 897 | return (B_TRUE); |
e95b3bdc BB |
898 | } |
899 | } | |
900 | } | |
428870ff | 901 | |
ecf3d9b8 | 902 | kmem_cache_free(ddt_entry_cache, dde); |
428870ff BB |
903 | return (B_FALSE); |
904 | } | |
905 | ||
906 | ddt_entry_t * | |
907 | ddt_repair_start(ddt_t *ddt, const blkptr_t *bp) | |
908 | { | |
909 | ddt_key_t ddk; | |
910 | ddt_entry_t *dde; | |
911 | ||
912 | ddt_key_fill(&ddk, bp); | |
913 | ||
914 | dde = ddt_alloc(&ddk); | |
915 | ||
1c27024e DB |
916 | for (enum ddt_type type = 0; type < DDT_TYPES; type++) { |
917 | for (enum ddt_class class = 0; class < DDT_CLASSES; class++) { | |
428870ff BB |
918 | /* |
919 | * We can only do repair if there are multiple copies | |
920 | * of the block. For anything in the UNIQUE class, | |
921 | * there's definitely only one copy, so don't even try. | |
922 | */ | |
923 | if (class != DDT_CLASS_UNIQUE && | |
924 | ddt_object_lookup(ddt, type, class, dde) == 0) | |
925 | return (dde); | |
926 | } | |
927 | } | |
928 | ||
929 | bzero(dde->dde_phys, sizeof (dde->dde_phys)); | |
930 | ||
931 | return (dde); | |
932 | } | |
933 | ||
934 | void | |
935 | ddt_repair_done(ddt_t *ddt, ddt_entry_t *dde) | |
936 | { | |
937 | avl_index_t where; | |
938 | ||
939 | ddt_enter(ddt); | |
940 | ||
a6255b7f | 941 | if (dde->dde_repair_abd != NULL && spa_writeable(ddt->ddt_spa) && |
428870ff BB |
942 | avl_find(&ddt->ddt_repair_tree, dde, &where) == NULL) |
943 | avl_insert(&ddt->ddt_repair_tree, dde, where); | |
944 | else | |
945 | ddt_free(dde); | |
946 | ||
947 | ddt_exit(ddt); | |
948 | } | |
949 | ||
950 | static void | |
951 | ddt_repair_entry_done(zio_t *zio) | |
952 | { | |
953 | ddt_entry_t *rdde = zio->io_private; | |
954 | ||
955 | ddt_free(rdde); | |
956 | } | |
957 | ||
958 | static void | |
959 | ddt_repair_entry(ddt_t *ddt, ddt_entry_t *dde, ddt_entry_t *rdde, zio_t *rio) | |
960 | { | |
961 | ddt_phys_t *ddp = dde->dde_phys; | |
962 | ddt_phys_t *rddp = rdde->dde_phys; | |
963 | ddt_key_t *ddk = &dde->dde_key; | |
964 | ddt_key_t *rddk = &rdde->dde_key; | |
965 | zio_t *zio; | |
966 | blkptr_t blk; | |
967 | ||
968 | zio = zio_null(rio, rio->io_spa, NULL, | |
969 | ddt_repair_entry_done, rdde, rio->io_flags); | |
970 | ||
1c27024e | 971 | for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++, rddp++) { |
428870ff BB |
972 | if (ddp->ddp_phys_birth == 0 || |
973 | ddp->ddp_phys_birth != rddp->ddp_phys_birth || | |
974 | bcmp(ddp->ddp_dva, rddp->ddp_dva, sizeof (ddp->ddp_dva))) | |
975 | continue; | |
976 | ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk); | |
977 | zio_nowait(zio_rewrite(zio, zio->io_spa, 0, &blk, | |
a6255b7f | 978 | rdde->dde_repair_abd, DDK_GET_PSIZE(rddk), NULL, NULL, |
428870ff BB |
979 | ZIO_PRIORITY_SYNC_WRITE, ZIO_DDT_CHILD_FLAGS(zio), NULL)); |
980 | } | |
981 | ||
982 | zio_nowait(zio); | |
983 | } | |
984 | ||
985 | static void | |
986 | ddt_repair_table(ddt_t *ddt, zio_t *rio) | |
987 | { | |
988 | spa_t *spa = ddt->ddt_spa; | |
989 | ddt_entry_t *dde, *rdde_next, *rdde; | |
990 | avl_tree_t *t = &ddt->ddt_repair_tree; | |
991 | blkptr_t blk; | |
992 | ||
993 | if (spa_sync_pass(spa) > 1) | |
994 | return; | |
995 | ||
996 | ddt_enter(ddt); | |
997 | for (rdde = avl_first(t); rdde != NULL; rdde = rdde_next) { | |
998 | rdde_next = AVL_NEXT(t, rdde); | |
999 | avl_remove(&ddt->ddt_repair_tree, rdde); | |
1000 | ddt_exit(ddt); | |
1001 | ddt_bp_create(ddt->ddt_checksum, &rdde->dde_key, NULL, &blk); | |
1002 | dde = ddt_repair_start(ddt, &blk); | |
1003 | ddt_repair_entry(ddt, dde, rdde, rio); | |
1004 | ddt_repair_done(ddt, dde); | |
1005 | ddt_enter(ddt); | |
1006 | } | |
1007 | ddt_exit(ddt); | |
1008 | } | |
1009 | ||
1010 | static void | |
1011 | ddt_sync_entry(ddt_t *ddt, ddt_entry_t *dde, dmu_tx_t *tx, uint64_t txg) | |
1012 | { | |
1013 | dsl_pool_t *dp = ddt->ddt_spa->spa_dsl_pool; | |
1014 | ddt_phys_t *ddp = dde->dde_phys; | |
1015 | ddt_key_t *ddk = &dde->dde_key; | |
1016 | enum ddt_type otype = dde->dde_type; | |
1017 | enum ddt_type ntype = DDT_TYPE_CURRENT; | |
1018 | enum ddt_class oclass = dde->dde_class; | |
1019 | enum ddt_class nclass; | |
1020 | uint64_t total_refcnt = 0; | |
1021 | ||
1022 | ASSERT(dde->dde_loaded); | |
1023 | ASSERT(!dde->dde_loading); | |
1024 | ||
1c27024e | 1025 | for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
428870ff | 1026 | ASSERT(dde->dde_lead_zio[p] == NULL); |
428870ff BB |
1027 | if (ddp->ddp_phys_birth == 0) { |
1028 | ASSERT(ddp->ddp_refcnt == 0); | |
1029 | continue; | |
1030 | } | |
1031 | if (p == DDT_PHYS_DITTO) { | |
050d720c MA |
1032 | /* |
1033 | * Note, we no longer create DDT-DITTO blocks, but we | |
1034 | * don't want to leak any written by older software. | |
1035 | */ | |
1036 | ddt_phys_free(ddt, ddk, ddp, txg); | |
428870ff BB |
1037 | continue; |
1038 | } | |
1039 | if (ddp->ddp_refcnt == 0) | |
1040 | ddt_phys_free(ddt, ddk, ddp, txg); | |
1041 | total_refcnt += ddp->ddp_refcnt; | |
1042 | } | |
1043 | ||
050d720c MA |
1044 | /* We do not create new DDT-DITTO blocks. */ |
1045 | ASSERT0(dde->dde_phys[DDT_PHYS_DITTO].ddp_phys_birth); | |
1046 | if (total_refcnt > 1) | |
428870ff BB |
1047 | nclass = DDT_CLASS_DUPLICATE; |
1048 | else | |
1049 | nclass = DDT_CLASS_UNIQUE; | |
1050 | ||
1051 | if (otype != DDT_TYPES && | |
1052 | (otype != ntype || oclass != nclass || total_refcnt == 0)) { | |
1053 | VERIFY(ddt_object_remove(ddt, otype, oclass, dde, tx) == 0); | |
1054 | ASSERT(ddt_object_lookup(ddt, otype, oclass, dde) == ENOENT); | |
1055 | } | |
1056 | ||
1057 | if (total_refcnt != 0) { | |
1058 | dde->dde_type = ntype; | |
1059 | dde->dde_class = nclass; | |
1060 | ddt_stat_update(ddt, dde, 0); | |
1061 | if (!ddt_object_exists(ddt, ntype, nclass)) | |
1062 | ddt_object_create(ddt, ntype, nclass, tx); | |
1063 | VERIFY(ddt_object_update(ddt, ntype, nclass, dde, tx) == 0); | |
1064 | ||
1065 | /* | |
1066 | * If the class changes, the order that we scan this bp | |
1067 | * changes. If it decreases, we could miss it, so | |
1068 | * scan it right now. (This covers both class changing | |
1069 | * while we are doing ddt_walk(), and when we are | |
1070 | * traversing.) | |
1071 | */ | |
1072 | if (nclass < oclass) { | |
1073 | dsl_scan_ddt_entry(dp->dp_scan, | |
1074 | ddt->ddt_checksum, dde, tx); | |
1075 | } | |
1076 | } | |
1077 | } | |
1078 | ||
1079 | static void | |
1080 | ddt_sync_table(ddt_t *ddt, dmu_tx_t *tx, uint64_t txg) | |
1081 | { | |
1082 | spa_t *spa = ddt->ddt_spa; | |
1083 | ddt_entry_t *dde; | |
1084 | void *cookie = NULL; | |
1085 | ||
1086 | if (avl_numnodes(&ddt->ddt_tree) == 0) | |
1087 | return; | |
1088 | ||
1089 | ASSERT(spa->spa_uberblock.ub_version >= SPA_VERSION_DEDUP); | |
1090 | ||
1091 | if (spa->spa_ddt_stat_object == 0) { | |
9ae529ec CS |
1092 | spa->spa_ddt_stat_object = zap_create_link(ddt->ddt_os, |
1093 | DMU_OT_DDT_STATS, DMU_POOL_DIRECTORY_OBJECT, | |
1094 | DMU_POOL_DDT_STATS, tx); | |
428870ff BB |
1095 | } |
1096 | ||
1097 | while ((dde = avl_destroy_nodes(&ddt->ddt_tree, &cookie)) != NULL) { | |
1098 | ddt_sync_entry(ddt, dde, tx, txg); | |
1099 | ddt_free(dde); | |
1100 | } | |
1101 | ||
1c27024e | 1102 | for (enum ddt_type type = 0; type < DDT_TYPES; type++) { |
e8fd45a0 | 1103 | uint64_t add, count = 0; |
1c27024e | 1104 | for (enum ddt_class class = 0; class < DDT_CLASSES; class++) { |
572e2857 BB |
1105 | if (ddt_object_exists(ddt, type, class)) { |
1106 | ddt_object_sync(ddt, type, class, tx); | |
e8fd45a0 BB |
1107 | VERIFY(ddt_object_count(ddt, type, class, |
1108 | &add) == 0); | |
1109 | count += add; | |
572e2857 BB |
1110 | } |
1111 | } | |
1c27024e | 1112 | for (enum ddt_class class = 0; class < DDT_CLASSES; class++) { |
572e2857 | 1113 | if (count == 0 && ddt_object_exists(ddt, type, class)) |
428870ff BB |
1114 | ddt_object_destroy(ddt, type, class, tx); |
1115 | } | |
1116 | } | |
1117 | ||
1118 | bcopy(ddt->ddt_histogram, &ddt->ddt_histogram_cache, | |
1119 | sizeof (ddt->ddt_histogram)); | |
e8a20144 | 1120 | spa->spa_dedup_dspace = ~0ULL; |
428870ff BB |
1121 | } |
1122 | ||
1123 | void | |
1124 | ddt_sync(spa_t *spa, uint64_t txg) | |
1125 | { | |
d4a72f23 | 1126 | dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; |
428870ff | 1127 | dmu_tx_t *tx; |
d4a72f23 | 1128 | zio_t *rio; |
428870ff BB |
1129 | |
1130 | ASSERT(spa_syncing_txg(spa) == txg); | |
1131 | ||
1132 | tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); | |
1133 | ||
d4a72f23 | 1134 | rio = zio_root(spa, NULL, NULL, |
a1d477c2 | 1135 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SELF_HEAL); |
d4a72f23 TC |
1136 | |
1137 | /* | |
1138 | * This function may cause an immediate scan of ddt blocks (see | |
1139 | * the comment above dsl_scan_ddt() for details). We set the | |
1140 | * scan's root zio here so that we can wait for any scan IOs in | |
1141 | * addition to the regular ddt IOs. | |
1142 | */ | |
1143 | ASSERT3P(scn->scn_zio_root, ==, NULL); | |
1144 | scn->scn_zio_root = rio; | |
1145 | ||
1c27024e | 1146 | for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { |
428870ff BB |
1147 | ddt_t *ddt = spa->spa_ddt[c]; |
1148 | if (ddt == NULL) | |
1149 | continue; | |
1150 | ddt_sync_table(ddt, tx, txg); | |
1151 | ddt_repair_table(ddt, rio); | |
1152 | } | |
1153 | ||
1154 | (void) zio_wait(rio); | |
d4a72f23 | 1155 | scn->scn_zio_root = NULL; |
428870ff BB |
1156 | |
1157 | dmu_tx_commit(tx); | |
1158 | } | |
1159 | ||
1160 | int | |
1161 | ddt_walk(spa_t *spa, ddt_bookmark_t *ddb, ddt_entry_t *dde) | |
1162 | { | |
1163 | do { | |
1164 | do { | |
1165 | do { | |
1166 | ddt_t *ddt = spa->spa_ddt[ddb->ddb_checksum]; | |
1167 | int error = ENOENT; | |
1168 | if (ddt_object_exists(ddt, ddb->ddb_type, | |
1169 | ddb->ddb_class)) { | |
1170 | error = ddt_object_walk(ddt, | |
1171 | ddb->ddb_type, ddb->ddb_class, | |
1172 | &ddb->ddb_cursor, dde); | |
1173 | } | |
1174 | dde->dde_type = ddb->ddb_type; | |
1175 | dde->dde_class = ddb->ddb_class; | |
1176 | if (error == 0) | |
1177 | return (0); | |
1178 | if (error != ENOENT) | |
1179 | return (error); | |
1180 | ddb->ddb_cursor = 0; | |
1181 | } while (++ddb->ddb_checksum < ZIO_CHECKSUM_FUNCTIONS); | |
1182 | ddb->ddb_checksum = 0; | |
1183 | } while (++ddb->ddb_type < DDT_TYPES); | |
1184 | ddb->ddb_type = 0; | |
1185 | } while (++ddb->ddb_class < DDT_CLASSES); | |
1186 | ||
2e528b49 | 1187 | return (SET_ERROR(ENOENT)); |
428870ff | 1188 | } |
c409e464 | 1189 | |
03fdcb9a MM |
1190 | /* BEGIN CSTYLED */ |
1191 | ZFS_MODULE_PARAM(zfs, zfs_, dedup_prefetch, INT, ZMOD_RW, | |
1192 | "Enable prefetching dedup-ed blks"); | |
1193 | /* END CSTYLED */ |